{"id":20604,"date":"2025-12-05T11:56:06","date_gmt":"2025-12-05T03:56:06","guid":{"rendered":"https:\/\/viox.com\/?p=20604"},"modified":"2025-12-06T10:35:18","modified_gmt":"2025-12-06T02:35:18","slug":"current-limiting-circuit-breaker-guide","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/current-limiting-circuit-breaker-guide\/","title":{"rendered":"H\u1ea1n Ch\u1ebf Hi\u1ec7n Ng\u1eaft M\u1ea1ch D\u1eabn: V\u00e0 B\u1ea3o V\u1ec7 K\u1ef9 Thu\u1eadt"},"content":{"rendered":"<div class=\"product-intro\">\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/Professional header image showing a modern current-limiting MCCB with VIOX branding in industrial blue and gray color scheme.webp\" alt=\"Professional header image showing a modern current-limiting MCCB with VIOX branding\" \/><figcaption><em>\u56fe1\uff1a\u9650\u6d41\u65ad\u8def\u5668\u901a\u8fc7\u5728\u4e2d\u51fb\u7535\u6d41\u8fbe\u5230\u7834\u574f\u6027\u5cf0\u503c\u524d\u5207\u65ad\u6545\u969c\u7535\u6d41\uff0c\u4ee5\u4fdd\u62a4\u7535\u6c14\u7cfb\u7edf\u3002VIOX Electric\u751f\u4ea7\u7684\u9650\u6d41\u578b\u5851\u58f3\u65ad\u8def\u5668\u7b26\u5408IEC 60947-2\u548cUL 489\u6807\u51c6\u3002.<\/em><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>\u5728\u73b0\u4ee3\u7535\u6c14\u7cfb\u7edf\u4e2d\uff0c\u77ed\u8def\u6545\u969c\u53ef\u5728\u6beb\u79d2\u5185\u91ca\u653e\u7834\u574f\u6027\u5de8\u5927\u7684\u80fd\u91cf\u300250,000\u5b89\u57f9\u7684\u9884\u671f\u6545\u969c\u7535\u6d41\u4f1a\u4ea7\u751f\u8db3\u4ee5\u4f7f\u6bcd\u7ebf\u5f2f\u66f2\u7684\u7535\u78c1\u529b\u3001\u8db3\u4ee5\u6c7d\u5316\u94dc\u5bfc\u4f53\u7684\u70ed\u80fd\uff0c\u4ee5\u53ca\u5371\u53ca\u4eba\u5458\u7684\u7535\u5f27\u95ea\u71c3\u5371\u5bb3\u3002\u7136\u800c\uff0c\u8fd9\u4e9b\u7834\u574f\u5927\u591a\u662f\u53ef\u9884\u9632\u7684\u3002.<\/p>\n<p>\u9650\u6d41\u65ad\u8def\u5668\u4ee3\u8868\u4e86\u7535\u8def\u4fdd\u62a4\u6280\u672f\u7684\u6839\u672c\u6027\u8fdb\u6b65\u3002\u4e0e\u4f20\u7edf\u65ad\u8def\u5668\u5728\u4ea4\u6d41\u6ce2\u5f62\u81ea\u7136\u8fc7\u96f6\u70b9\u5207\u65ad\u6545\u969c\u4e0d\u540c\uff0c\u9650\u6d41\u65ad\u8def\u5668\u5728\u6beb\u79d2\u5185\u52a8\u4f5c\uff0c\u5728\u6545\u969c\u7535\u6d41\u8fbe\u5230\u7834\u574f\u6027\u5cf0\u503c\u524d\u5c06\u5176\u627c\u5236\u3002\u8fd9\u79cd\u5feb\u901f\u5e72\u9884\u663e\u8457\u964d\u4f4e\u4e86\u7535\u6c14\u8bbe\u5907\u627f\u53d7\u7684\u673a\u68b0\u5e94\u529b\u548c\u70ed\u5e94\u529b\uff0c\u4fdd\u62a4\u654f\u611f\u7535\u5b50\u8bbe\u5907\u514d\u53d7\u635f\u574f\uff0c\u5e76\u5927\u5e45\u51cf\u8f7b\u7535\u5f27\u95ea\u71c3\u5371\u5bb3\u3002.<\/p>\n<p>\u5bf9\u4e8e\u8bbe\u8ba1\u914d\u7535\u7cfb\u7edf\u7684\u7535\u6c14\u5de5\u7a0b\u5e08\u3001\u9009\u62e9\u4fdd\u62a4\u8bbe\u5907\u7684\u76d8\u67dc\u5236\u9020\u5546\uff0c\u4ee5\u53ca\u8d1f\u8d23\u5173\u952e\u57fa\u7840\u8bbe\u65bd\u7684\u8bbe\u65bd\u7ba1\u7406\u4eba\u5458\u800c\u8a00\uff0c\u7406\u89e3\u9650\u6d41\u6280\u672f\u81f3\u5173\u91cd\u8981\u3002\u672c\u6307\u5357\u5c06\u9610\u8ff0\u9650\u6d41\u65ad\u8def\u5668\u7684\u5de5\u4f5c\u539f\u7406\u3001\u5b9a\u4e49\u5176\u6027\u80fd\u7684\u5173\u952e\u89c4\u683c\uff0c\u4ee5\u53ca\u8be5\u6280\u672f\u5728\u54ea\u4e9b\u573a\u666f\u4e0b\u6bd4\u6807\u51c6\u7535\u8def\u4fdd\u62a4\u66f4\u5177\u5173\u952e\u4f18\u52bf\u3002.<\/p>\n<h2>\u4ec0\u4e48\u662f\u9650\u6d41\u65ad\u8def\u5668\uff1f<\/h2>\n<p>\u9650\u6d41\u65ad\u8def\u5668\u662f\u4e00\u79cd\u4fdd\u62a4\u88c5\u7f6e\uff0c\u5176\u8bbe\u8ba1\u76ee\u6807\u662f\u5728\u77ed\u8def\u7535\u6d41\u8fbe\u5230\u9884\u671f\u6700\u5927\u503c\u524d\u5c06\u5176\u5207\u65ad\u3002\u8fd9\u4e00\u80fd\u529b\u4f7f\u5176\u533a\u522b\u4e8e\u4f20\u7edf\u65ad\u8def\u5668\u2014\u2014\u4f20\u7edf\u65ad\u8def\u5668\u901a\u5e38\u5141\u8bb8\u6545\u969c\u7535\u6d41\u8fbe\u5230\u5b8c\u6574\u5cf0\u503c\uff0c\u7136\u540e\u5728\u81ea\u7136\u8fc7\u96f6\u70b9\u8fdb\u884c\u5207\u65ad\u3002.<\/p>\n<p>\u5f53\u7535\u6c14\u7cfb\u7edf\u53d1\u751f\u77ed\u8def\u65f6\uff0c\u7535\u6d41\u4ee5\u6781\u9ad8\u7684\u901f\u7387\u5f00\u59cb\u4e0a\u5347\u2014\u2014\u53ef\u80fd\u5728\u6beb\u79d2\u5185\u8fbe\u5230\u6570\u4e07\u5b89\u57f9\u3002\u6807\u51c6\u65ad\u8def\u5668\u68c0\u6d4b\u5230\u6b64\u6545\u969c\u72b6\u6001\u5e76\u542f\u52a8\u8131\u6263\u673a\u5236\uff0c\u4f46\u5207\u65ad\u8fc7\u7a0b\u9700\u8981\u65f6\u95f4\u3002\u5728\u8fd9\u77ed\u6682\u95f4\u9694\u5185\uff0c\u6545\u969c\u7535\u6d41\u53ef\u80fd\u8fbe\u5230\u5176\u5b8c\u6574\u7684\u9884\u671f\u5cf0\u503c\uff0c\u91ca\u653e\u5de8\u5927\u80fd\u91cf\uff0c\u4f7f\u5bfc\u7ebf\u3001\u6bcd\u7ebf\u548c\u4e0b\u6e38\u8bbe\u5907\u627f\u53d7\u5e94\u529b\u3002.<\/p>\n<p>\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u9650\u6d41\u65ad\u8def\u5668\u4ee5\u8d85\u5e38\u901f\u5ea6\u52a8\u4f5c\u3002\u6839\u636eUL 489\uff08\u5317\u7f8e\u5851\u58f3\u65ad\u8def\u5668\u6807\u51c6\uff09\uff0c\u82e5\u65ad\u8def\u5668\u80fd\u5728\u534a\u4e2a\u5468\u6ce2\u5185\uff08\u901a\u5e38\u5c11\u4e8e10\u6beb\u79d2\uff09\u6e05\u9664\u6545\u969c\uff0c\u5373\u7b26\u5408\u201c\u9650\u6d41\u201d\u8d44\u683c\u3002\u8fd9\u79cd\u5feb\u901f\u54cd\u5e94\u4f1a\u4ea7\u751f\u9ad8\u7535\u5f27\u7535\u538b\u6765\u5bf9\u6297\u7cfb\u7edf\u7535\u538b\uff0c\u6709\u6548\u627c\u5236\u7535\u6d41\u6d41\u52a8\uff0c\u4f7f\u5b9e\u9645\u901a\u8fc7\u7684\u5cf0\u503c\u7535\u6d41\u8fdc\u4f4e\u4e8e\u9884\u671f\u6545\u969c\u7535\u6d41\u3002.<\/p>\n<p>\u6548\u679c\u662f\u663e\u8457\u7684\uff1a\u867d\u7136\u9884\u671f\u6545\u969c\u7535\u6d41\u53ef\u80fd\u4e3a50,000\u5b89\u57f9\u6709\u6548\u503c\u5bf9\u79f0\u7535\u6d41\uff0c\u4f46\u9650\u6d41\u65ad\u8def\u5668\u53ef\u5c06\u5b9e\u9645\u5cf0\u503c\u7535\u6d41\u9650\u5236\u572815,000\u5b89\u57f9\u6216\u66f4\u4f4e\u3002\u8fd9\u79cd\u5cf0\u503c\u7535\u6d41\u548c\u603b\u6545\u969c\u80fd\u91cf\u7684\u964d\u4f4e\uff0c\u4fdd\u62a4\u4e86\u4e0b\u6e38\u8bbe\u5907\u514d\u53d7\u539f\u672c\u4f1a\u53d1\u751f\u7684\u673a\u68b0\u529b\u3001\u70ed\u635f\u4f24\u548c\u7535\u5f27\u95ea\u71c3\u5371\u5bb3\u3002.<\/p>\n<h2>\u9650\u6d41\u65ad\u8def\u5668\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/professional-product-photograph-of-a-current-limiting-mccb-showing-compact-molded-case-operating-handle-and-mounting-features.png\" alt=\"Current-limiting molded case circuit breaker product photograph\" \/><figcaption><em>\u56fe2\uff1a\u9650\u6d41\u578b <a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">\u5851\u58f3\u65ad\u8def\u5668\uff08MCCB\uff09<\/a> \u91c7\u7528\u7279\u6b8a\u7684\u5185\u90e8\u673a\u6784\u5b9e\u73b0\u8d85\u5feb\u901f\u6545\u969c\u5207\u65ad\uff0c\u901a\u5e38\u572810\u6beb\u79d2\u5185\u6e05\u9664\u6545\u969c\u3002.<\/em><\/figcaption><\/figure>\n<p>\u8fd9\u4e9b\u65ad\u8def\u5668\u7684\u9650\u6d41\u80fd\u529b\u6e90\u4e8e\u673a\u68b0\u8bbe\u8ba1\u3001\u7535\u78c1\u7269\u7406\u548c\u7535\u5f27\u7ba1\u7406\u7684\u7cbe\u5fc3\u5de5\u7a0b\u7ec4\u5408\u3002\u8be5\u8fc7\u7a0b\u901a\u8fc7\u591a\u4e2a\u534f\u540c\u673a\u5236\u5728\u6beb\u79d2\u5185\u5b8c\u6210\u3002.<\/p>\n<h3>\u7535\u52a8\u529b\u89e6\u5934\u5206\u79bb<\/h3>\n<p>\u7b2c\u4e00\u4e2a\u5173\u952e\u8981\u7d20\u662f\u8d85\u5feb\u901f\u89e6\u5934\u5206\u79bb\u3002\u5f53\u9ad8\u6545\u969c\u7535\u6d41\u6d41\u7ecf\u65ad\u8def\u5668\u89e6\u5934\u65f6\uff0c\u7535\u6d41\u4ea7\u751f\u7684\u5de8\u5927\u78c1\u573a\u5f62\u6210\u5f3a\u5927\u7684\u7535\u52a8\u529b\u3002\u9650\u6d41\u65ad\u8def\u5668\u7684\u89e6\u5934\u7ed3\u6784\u8bbe\u8ba1\u5229\u7528\u8fd9\u4e9b\u529b\u8f85\u52a9\u5206\u79bb\u2014\u2014\u89e6\u5934\u5e03\u7f6e\u4f7f\u78c1\u573a\u4ea7\u751f\u6392\u65a5\u529b\uff0c\u4ece\u800c\u5c06\u89e6\u5934\u8fc5\u901f\u63a8\u5f00\u3002.<\/p>\n<p>\u8fd9\u79cd\u201c\u7535\u52a8\u65a5\u529b\u201d\u610f\u5473\u7740\u66f4\u9ad8\u7684\u6545\u969c\u7535\u6d41\u5b9e\u9645\u4e0a\u4f1a\u52a0\u901f\u89e6\u5934\u5206\u79bb\u3002\u65ad\u8def\u5668\u4e0d\u4ec5\u4f9d\u8d56\u8131\u6263\u673a\u6784\u7684\u673a\u68b0\u529b\uff1b\u6545\u969c\u7535\u6d41\u672c\u8eab\u4e5f\u63d0\u4f9b\u80fd\u91cf\u4f7f\u89e6\u5934\u66f4\u5feb\u6253\u5f00\u3002\u8fd9\u786e\u4fdd\u4e86\u6781\u5feb\u7684\u89e6\u5934\u5206\u79bb\u2014\u2014\u901a\u5e38\u5728\u6545\u969c\u53d1\u751f\u540e\u76841-2\u6beb\u79d2\u5185\u5b8c\u6210\u3002.<\/p>\n<h3>\u7535\u5f27\u5f62\u6210\u4e0e\u62c9\u957f<\/h3>\n<p>\u5f53\u89e6\u5934\u9ad8\u901f\u5206\u79bb\u65f6\uff0c\u95f4\u9699\u4e2d\u5f62\u6210\u7535\u5f27\u3002\u8fd9\u5e76\u975e\u9700\u8981\u6291\u5236\u7684\u95ee\u9898\uff0c\u53cd\u800c\u6210\u4e3a\u7535\u6d41\u9650\u5236\u7684\u4e3b\u8981\u5de5\u5177\u3002\u65ad\u8def\u5668\u7684\u5185\u90e8\u7ed3\u6784\u8bbe\u8ba1\u8feb\u4f7f\u7535\u5f27\u5feb\u901f\u8fdc\u79bb\u89e6\u5934\uff0c\u8fdb\u5165\u4e13\u95e8\u8bbe\u8ba1\u7684\u706d\u5f27\u5ba4\uff08\u5373\u706d\u5f27\u6805\uff09\u3002.<\/p>\n<p>T\u1eeb tr\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi d\u00f2ng \u0111i\u1ec7n v\u00e0 h\u00ecnh d\u1ea1ng v\u1eadt l\u00fd c\u1ee7a c\u00e1c r\u00e3nh h\u1ed3 quang d\u1eabn h\u1ed3 quang l\u00ean tr\u00ean v\u00e0o \u1ed1ng d\u1eadp h\u1ed3 quang. Khi h\u1ed3 quang di chuy\u1ec3n v\u00e0 k\u00e9o d\u00e0i, chi\u1ec1u d\u00e0i c\u1ee7a n\u00f3 t\u0103ng l\u00ean \u0111\u00e1ng k\u1ec3. M\u1ed9t h\u1ed3 quang d\u00e0i h\u01a1n \u0111\u00f2i h\u1ecfi \u0111i\u1ec7n \u00e1p cao h\u01a1n \u0111\u1ec3 duy tr\u00ec n\u00f3, v\u00e0 \u0111i\u1ec7n \u00e1p h\u1ed3 quang n\u00e0y ch\u1ed1ng l\u1ea1i \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1.<\/p>\n<h3>Chuy\u1ec3n m\u1ea1ch v\u00e0 Ph\u00e2n t\u00e1ch H\u1ed3 quang<\/h3>\n<p>\u1ed0ng d\u1eadp h\u1ed3 quang ch\u1ee9a m\u1ed9t lo\u1ea1t c\u00e1c t\u1ea5m kim lo\u1ea1i \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo m\u1ed9t c\u1ea5u h\u00ecnh c\u1ee5 th\u1ec3 (th\u01b0\u1eddng c\u00f3 h\u00ecnh ch\u1eef V), \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed9 chia h\u1ed3 quang ho\u1eb7c b\u1ed9 ph\u00e2n t\u00e1ch h\u1ed3 quang. Khi h\u1ed3 quang \u0111\u01b0\u1ee3c d\u1eabn v\u00e0o \u1ed1ng, n\u00f3 ti\u1ebfp x\u00fac v\u1edbi c\u00e1c t\u1ea5m n\u00e0y v\u00e0 \u201cchuy\u1ec3n m\u1ea1ch\u201d - chuy\u1ec3n t\u1eeb \u0111\u01b0\u1eddng d\u1eabn h\u1ed3 quang ch\u00ednh sang c\u00e1c t\u1ea5m chia.<\/p>\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y ph\u00e2n t\u00e1ch hi\u1ec7u qu\u1ea3 h\u1ed3 quang n\u0103ng l\u01b0\u1ee3ng cao \u0111\u01a1n th\u00e0nh nhi\u1ec1u h\u1ed3 quang nh\u1ecf h\u01a1n m\u1eafc n\u1ed1i ti\u1ebfp. M\u1ed7i h\u1ed3 quang nh\u1ecf ph\u00e1t tri\u1ec3n \u0111i\u1ec7n \u00e1p r\u01a1i ri\u00eang. V\u00ed d\u1ee5, n\u1ebfu \u1ed1ng d\u1eadp h\u1ed3 quang ch\u1ee9a 20 t\u1ea5m chia, t\u1ed5ng \u0111i\u1ec7n \u00e1p h\u1ed3 quang c\u00f3 th\u1ec3 \u0111\u1ea1t g\u1ea5p nhi\u1ec1u l\u1ea7n \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng. Khi \u0111i\u1ec7n \u00e1p h\u1ed3 quang t\u00edch l\u0169y v\u01b0\u1ee3t qu\u00e1 \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng, d\u00f2ng \u0111i\u1ec7n bu\u1ed9c ph\u1ea3i gi\u1ea3m nhanh ch\u00f3ng.<\/p>\n<h3>L\u00e0m m\u00e1t v\u00e0 D\u1eadp t\u1eaft H\u1ed3 quang<\/h3>\n<p>C\u00e1c t\u1ea5m chia kim lo\u1ea1i c\u0169ng \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u1ea3n nhi\u1ec7t, l\u00e0m m\u00e1t nhanh ch\u00f3ng c\u00e1c h\u1ed3 quang. C\u00e1c t\u1ea5m l\u00e0m t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t c\u1ee7a h\u1ed3 quang v\u00e0 d\u1eabn nhi\u1ec7t \u0111i. K\u1ebft h\u1ee3p v\u1edbi kh\u00f4ng kh\u00ed xung quanh ho\u1eb7c kh\u00ed d\u1eadp h\u1ed3 quang, qu\u00e1 tr\u00ecnh l\u00e0m m\u00e1t n\u00e0y l\u00e0m gi\u1ea3m \u0111\u1ed9 d\u1eabn \u0111i\u1ec7n c\u1ee7a h\u1ed3 quang.<\/p>\n<p>S\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa \u0111i\u1ec7n \u00e1p h\u1ed3 quang cao (ch\u1ed1ng l\u1ea1i d\u00f2ng \u0111i\u1ec7n) v\u00e0 l\u00e0m m\u00e1t h\u1ed3 quang (gi\u1ea3m \u0111\u1ed9 d\u1eabn \u0111i\u1ec7n) bu\u1ed9c d\u00f2ng \u0111i\u1ec7n v\u1ec1 kh\u00f4ng. B\u1ed9 ng\u1eaft m\u1ea1ch d\u1eadp t\u1eaft h\u1ed3 quang v\u00e0 x\u00f3a s\u1ef1 c\u1ed1 - t\u1ea5t c\u1ea3 ch\u1ec9 trong m\u1ed9t ph\u1ea7n c\u1ee7a chu k\u1ef3, tr\u01b0\u1edbc khi d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1ea1t \u0111\u1ebfn \u0111\u1ec9nh ti\u1ec1m n\u0103ng c\u1ee7a n\u00f3.<\/p>\n<p>To\u00e0n b\u1ed9 tr\u00ecnh t\u1ef1 n\u00e0y - t\u1eeb ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 th\u00f4ng qua t\u00e1ch ti\u1ebfp \u0111i\u1ec3m, k\u00e9o d\u00e0i h\u1ed3 quang, ph\u00e2n t\u00e1ch v\u00e0 d\u1eadp t\u1eaft - x\u1ea3y ra trong v\u00f2ng ch\u01b0a \u0111\u1ea7y 10 mili gi\u00e2y. D\u00f2ng \u0111i\u1ec7n b\u1ecb gi\u00e1n \u0111o\u1ea1n kh\u00f4ng ph\u1ea3i \u1edf \u0111i\u1ec3m c\u1eaft kh\u00f4ng t\u1ef1 nhi\u00ean m\u00e0 m\u1ed9t c\u00e1ch c\u01b0\u1ee1ng b\u1ee9c, b\u1eb1ng c\u00e1ch t\u1ea1o ra c\u00e1c \u0111i\u1ec1u ki\u1ec7n m\u00e0 h\u1ed3 quang kh\u00f4ng th\u1ec3 duy tr\u00ec \u0111\u01b0\u1ee3c.<\/p>\n<h2>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u00ednh<\/h2>\n<p>Hi\u1ec3u hi\u1ec7u su\u1ea5t gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u00f2i h\u1ecfi ph\u1ea3i l\u00e0m quen v\u1edbi ba th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt quan tr\u1ecdng x\u00e1c \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 hi\u1ec7u qu\u1ea3 c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch trong vi\u1ec7c gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u00e0 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/technical-cutaway-illustration-showing-the-internal-mechanism-of-a-current-limiting-circuit-breaker-with-arc-chute-splitter-plates-and-contact-assembly.webp\" alt=\"Technical cutaway illustration of current-limiting circuit breaker internal mechanism\" \/><figcaption>H\u00ecnh 3: C\u01a1 ch\u1ebf b\u00ean trong c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n. \u1ed0ng d\u1eadp h\u1ed3 quang v\u1edbi nhi\u1ec1u t\u1ea5m chia ph\u00e2n chia h\u1ed3 quang th\u00e0nh c\u00e1c \u0111o\u1ea1n nh\u1ecf h\u01a1n, trong khi c\u00e1c r\u00e3nh h\u1ed3 quang d\u1eabn h\u1ed3 quang ra kh\u1ecfi c\u00e1c ti\u1ebfp \u0111i\u1ec3m. Thi\u1ebft k\u1ebf n\u00e0y t\u1ea1o ra \u0111i\u1ec7n \u00e1p h\u1ed3 quang cao ch\u1ed1ng l\u1ea1i d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1, bu\u1ed9c d\u1eadp t\u1eaft nhanh ch\u00f3ng.<\/figcaption><\/figure>\n<h3>D\u00f2ng \u0111i\u1ec7n Cho Qua (Ip)<\/h3>\n<p>Nh\u1eefng <strong>d\u00f2ng \u0111i\u1ec7n cho qua (Ip)<\/strong> l\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh th\u1ef1c t\u1ebf ch\u1ea1y qua b\u1ed9 ng\u1eaft m\u1ea1ch trong qu\u00e1 tr\u00ecnh x\u1ea3y ra s\u1ef1 c\u1ed1, \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng ampe. Gi\u00e1 tr\u1ecb n\u00e0y th\u1ec3 hi\u1ec7n hi\u1ec7u qu\u1ea3 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch: Ip th\u1ea5p h\u01a1n cho th\u1ea5y kh\u1ea3 n\u0103ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n t\u1ed1t h\u01a1n.<\/p>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p d\u1eef li\u1ec7u d\u00f2ng \u0111i\u1ec7n cho qua d\u01b0\u1edbi d\u1ea1ng c\u00e1c \u0111\u01b0\u1eddng cong \u0111\u1eb7c t\u00ednh. C\u00e1c \u0111\u1ed3 th\u1ecb n\u00e0y v\u1ebd d\u00f2ng \u0111i\u1ec7n cho qua \u0111\u1ec9nh (Ip) tr\u00ean tr\u1ee5c tung so v\u1edbi d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ti\u1ec1m n\u0103ng (ampe \u0111\u1ed1i x\u1ee9ng RMS) tr\u00ean tr\u1ee5c ho\u00e0nh. \u0110\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 m\u1ee9c s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng n\u00e0o t\u1ea1i \u0111i\u1ec3m l\u1eafp \u0111\u1eb7t, \u0111\u01b0\u1eddng cong hi\u1ec3n th\u1ecb d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh t\u1ed1i \u0111a s\u1ebd th\u1ef1c s\u1ef1 ch\u1ea1y qua.<\/p>\n<p>V\u00ed d\u1ee5: n\u1ebfu d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng t\u1ea1i m\u1ed9t b\u1ea3ng \u0111i\u1ec7n l\u00e0 42.000 ampe RMS \u0111\u1ed1i x\u1ee9ng, th\u00ec m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh th\u1ef1c t\u1ebf ch\u1ec9 c\u00f2n 18.000 ampe. Vi\u1ec7c gi\u1ea3m t\u1eeb d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh ti\u1ec1m n\u0103ng xu\u1ed1ng d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh th\u1ef1c t\u1ebf n\u00e0y b\u1ea3o v\u1ec7 c\u00e1c thanh c\u00e1i kh\u1ecfi b\u1ecb u\u1ed1n cong, ng\u0103n ng\u1eeba qu\u00e1 nhi\u1ec7t d\u00e2y d\u1eabn v\u00e0 gi\u1ea3m \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n h\u1ea1 ngu\u1ed3n.<\/p>\n<h3>\u1ee8ng su\u1ea5t Nhi\u1ec7t (I\u00b2t)<\/h3>\n<p>Nh\u1eefng <strong>Gi\u00e1 tr\u1ecb I\u00b2t<\/strong> (ph\u00e1t \u00e2m l\u00e0 \u201cI b\u00ecnh ph\u01b0\u01a1ng t\u201d), \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng ampe b\u00ecnh ph\u01b0\u01a1ng gi\u00e2y (A\u00b2s), \u0111\u1ecbnh l\u01b0\u1ee3ng n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t cho qua b\u1edfi b\u1ed9 ng\u1eaft m\u1ea1ch trong qu\u00e1 tr\u00ecnh x\u00f3a s\u1ef1 c\u1ed1. N\u00f3 \u0111\u1ea1i di\u1ec7n cho t\u00edch ph\u00e2n c\u1ee7a d\u00f2ng \u0111i\u1ec7n b\u00ecnh ph\u01b0\u01a1ng tr\u00ean t\u1ed5ng th\u1eddi gian x\u00f3a s\u1ef1 c\u1ed1.<\/p>\n<p>Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1p v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m. L\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a c\u00e1p c\u00f3 \u0111\u1ecbnh m\u1ee9c ch\u1ecbu nhi\u1ec7t c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng I\u00b2t. N\u1ebfu thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 cho qua nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t h\u01a1n m\u1ee9c c\u00e1p c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c, l\u1edbp c\u00e1ch \u0111i\u1ec7n s\u1ebd b\u1ecb h\u1ecfng ngay c\u1ea3 khi c\u00e1p kh\u00f4ng b\u1ecb n\u00f3ng ch\u1ea3y v\u1ec1 m\u1eb7t v\u1eadt l\u00fd.<\/p>\n<p>C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 I\u00b2t so v\u1edbi c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n. \u0110\u1ed1i v\u1edbi c\u00f9ng m\u1ed9t d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng, m\u1ed9t thi\u1ebft b\u1ecb gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 c\u00f3 gi\u00e1 tr\u1ecb I\u00b2t th\u1ea5p h\u01a1n 50-80% so v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch th\u00f4ng th\u01b0\u1eddng. \u1ee8ng su\u1ea5t nhi\u1ec7t gi\u1ea3m n\u00e0y ng\u0103n ng\u1eeba h\u01b0 h\u1ecfng d\u00e2y d\u1eabn, b\u1ea3o v\u1ec7 l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a c\u00e1p v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p c\u00e1c \u0111\u01b0\u1eddng cong I\u00b2t t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c \u0111\u01b0\u1eddng cong d\u00f2ng \u0111i\u1ec7n cho qua, hi\u1ec3n th\u1ecb n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t t\u1ed1i \u0111a nh\u01b0 m\u1ed9t h\u00e0m c\u1ee7a d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng. M\u1ed9t s\u1ed1 ti\u00eau chu\u1ea9n x\u00e1c \u0111\u1ecbnh c\u00e1c lo\u1ea1i gi\u1edbi h\u1ea1n n\u0103ng l\u01b0\u1ee3ng cho b\u1ed9 ng\u1eaft m\u1ea1ch d\u1ef1a tr\u00ean hi\u1ec7u su\u1ea5t I\u00b2t c\u1ee7a ch\u00fang.<\/p>\n<h3>Kh\u1ea3 n\u0103ng C\u1eaft (Icu v\u00e0 Ics)<\/h3>\n<p>Nh\u1eefng <strong>kh\u1ea3 n\u0103ng ph\u00e1 v\u1ee1<\/strong> x\u00e1c \u0111\u1ecbnh d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 t\u1ed1i \u0111a m\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 ng\u1eaft m\u1ed9t c\u00e1ch an to\u00e0n. Hai \u0111\u1ecbnh m\u1ee9c c\u00f3 li\u00ean quan theo ti\u00eau chu\u1ea9n IEC 60947-2 (ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf cho b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 th\u1ebf):<\/p>\n<ul>\n<li><strong>Kh\u1ea3 n\u0103ng ph\u00e1 v\u1ee1 t\u1ed1i \u0111a (Icu)<\/strong>: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 t\u1ed1i \u0111a m\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 ng\u1eaft m\u00e0 kh\u00f4ng b\u1ecb ph\u00e1 h\u1ee7y. Sau khi ng\u1eaft m\u1ed9t s\u1ef1 c\u1ed1 \u1edf m\u1ee9c Icu, b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng v\u00e0 c\u00f3 th\u1ec3 c\u1ea7n ph\u1ea3i thay th\u1ebf. \u0110i\u1ec1u n\u00e0y th\u1ec3 hi\u1ec7n gi\u1edbi h\u1ea1n tr\u00ean tuy\u1ec7t \u0111\u1ed1i c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng ng\u1eaft d\u1ecbch v\u1ee5 (Ics)<\/strong>: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 t\u1ed1i \u0111a m\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 ng\u1eaft nhi\u1ec1u l\u1ea7n trong khi v\u1eabn ho\u1ea1t \u0111\u1ed9ng \u0111\u1ea7y \u0111\u1ee7 v\u00e0 \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 ti\u1ebfp t\u1ee5c s\u1eed d\u1ee5ng. Ics \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng ph\u1ea7n tr\u0103m c\u1ee7a Icu (th\u01b0\u1eddng l\u00e0 50%, 75% ho\u1eb7c 100%). \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng quan tr\u1ecdng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 tin c\u1eady cao, n\u00ean \u01b0u ti\u00ean c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 Ics = 100% Icu.<\/li>\n<\/ul>\n<p>Quy t\u1eafc l\u1ef1a ch\u1ecdn c\u01a1 b\u1ea3n r\u1ea5t \u0111\u01a1n gi\u1ea3n: Icu c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch ph\u1ea3i b\u1eb1ng ho\u1eb7c l\u1edbn h\u01a1n d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ti\u1ec1m n\u0103ng t\u1ea1i \u0111i\u1ec3m l\u1eafp \u0111\u1eb7t. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng c\u1eaft cao (50kA, 85kA ho\u1eb7c cao h\u01a1n) \u1edf d\u1ea1ng y\u1ebfu t\u1ed1 nh\u1ecf g\u1ecdn v\u00ec b\u1ea3n th\u00e2n h\u00e0nh \u0111\u1ed9ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0m gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng m\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch ph\u1ea3i x\u1eed l\u00fd.<\/p>\n<h3>M\u1ed1i quan h\u1ec7 t\u01b0\u01a1ng h\u1ed7 c\u1ee7a c\u00e1c Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/h3>\n<p>C\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt n\u00e0y ph\u1ed1i h\u1ee3p v\u1edbi nhau \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh hi\u1ec7u su\u1ea5t b\u1ea3o v\u1ec7. Khi x\u1ea3y ra s\u1ef1 c\u1ed1 l\u00ean \u0111\u1ebfn \u0111\u1ecbnh m\u1ee9c Icu c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch, h\u00e0nh \u0111\u1ed9ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n s\u1ebd l\u00e0m gi\u1ea3m c\u1ea3 d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh (Ip) v\u00e0 t\u1ed5ng n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t (I\u00b2t) xu\u1ed1ng c\u00e1c gi\u00e1 tr\u1ecb th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi nh\u1eefng g\u00ec s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng s\u1ebd t\u1ea1o ra. Vi\u1ec7c gi\u1ea3m ph\u1ed1i h\u1ee3p \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc \u0111\u1ec9nh v\u00e0 thi\u1ec7t h\u1ea1i do nhi\u1ec7t n\u00e0y l\u00e0 \u0111i\u1ec1u khi\u1ebfn c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n tr\u1edf n\u00ean c\u1ea7n thi\u1ebft \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i c\u00f3 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng cao.<\/p>\n<h2>Ti\u00eau chu\u1ea9n v\u00e0 Tu\u00e2n th\u1ee7<\/h2>\n<p>C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1edfi c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf v\u00e0 khu v\u1ef1c nghi\u00eam ng\u1eb7t x\u00e1c \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t, quy tr\u00ecnh th\u1eed nghi\u1ec7m v\u00e0 ti\u00eau ch\u00ed an to\u00e0n.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/engineering-graph-showing-let-through-current-performance-curve-comparing-prospective-peak-current-versus-actual-limited-current.webp\" alt=\"Let-through current performance curve graph\" \/><figcaption>H\u00ecnh 4: \u0110\u01b0\u1eddng cong hi\u1ec7u su\u1ea5t d\u00f2ng \u0111i\u1ec7n cho qua cho th\u1ea5y b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1ec9nh nh\u01b0 th\u1ebf n\u00e0o. V\u00f9ng \u0111\u01b0\u1ee3c t\u00f4 b\u00f3ng th\u1ec3 hi\u1ec7n m\u1ee9c gi\u1ea3m d\u00f2ng \u0111i\u1ec7n \u0111\u1ea1t \u0111\u01b0\u1ee3c, b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb kh\u1ecfi \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc v\u00e0 nhi\u1ec7t ph\u00e1 h\u1ee7y.<\/figcaption><\/figure>\n<h3>IEC 60947-2: Ti\u00eau chu\u1ea9n Qu\u1ed1c t\u1ebf<\/h3>\n<p><strong>TRUY\u1ec0N th\u00f4ng 60947-2<\/strong> l\u00e0 ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf cho b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 th\u1ebf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 th\u01b0\u01a1ng m\u1ea1i. Ti\u00eau chu\u1ea9n to\u00e0n di\u1ec7n n\u00e0y thi\u1ebft l\u1eadp:<\/p>\n<ul>\n<li><strong>C\u00e1c lo\u1ea1i hi\u1ec7u su\u1ea5t<\/strong>: Ti\u00eau chu\u1ea9n ph\u00e2n bi\u1ec7t gi\u1eefa b\u1ed9 ng\u1eaft m\u1ea1ch Lo\u1ea1i A (kh\u00f4ng c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1eddi gian ng\u1eafn m\u1ea1ch c\u00f3 ch\u1ee7 \u00fd) v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch Lo\u1ea1i B (c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng th\u1eddi gian ng\u1eafn). H\u1ea7u h\u1ebft c\u00e1c MCCB gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i A.<\/li>\n<li><strong>X\u00e1c minh kh\u1ea3 n\u0103ng c\u1eaft<\/strong>: IEC 60947-2 ch\u1ec9 \u0111\u1ecbnh c\u00e1c tr\u00ecnh t\u1ef1 th\u1eed nghi\u1ec7m nghi\u00eam ng\u1eb7t \u0111\u1ec3 x\u00e1c minh c\u1ea3 kh\u1ea3 n\u0103ng c\u1eaft cu\u1ed1i c\u00f9ng (Icu) v\u00e0 kh\u1ea3 n\u0103ng c\u1eaft d\u1ecbch v\u1ee5 (Ics). C\u00e1c th\u1eed nghi\u1ec7m n\u00e0y bao g\u1ed3m nhi\u1ec1u thao t\u00e1c \u0111\u00f3ng v\u00e0 c\u1eaft trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n s\u1ef1 c\u1ed1 \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh.<\/li>\n<li><strong>Hi\u1ec7u su\u1ea5t gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: M\u1eb7c d\u00f9 ti\u00eau chu\u1ea9n kh\u00f4ng b\u1eaft bu\u1ed9c gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n, nh\u01b0ng n\u00f3 cung c\u1ea5p c\u00e1c quy tr\u00ecnh th\u1eed nghi\u1ec7m \u0111\u1ec3 x\u00e1c minh v\u00e0 ghi l\u1ea1i d\u00f2ng \u0111i\u1ec7n cho qua v\u00e0 hi\u1ec7u su\u1ea5t I\u00b2t cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch tuy\u00ean b\u1ed1 kh\u1ea3 n\u0103ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n.<\/li>\n<li><strong>Ph\u1ed1i h\u1ee3p v\u00e0 ch\u1ecdn l\u1ecdc<\/strong>: Ti\u00eau chu\u1ea9n thi\u1ebft l\u1eadp c\u00e1c y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi b\u1ea3o v\u1ec7 d\u1ef1 ph\u00f2ng (x\u1ebfp t\u1ea7ng), trong \u0111\u00f3 m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u1edf th\u01b0\u1ee3ng ngu\u1ed3n b\u1ea3o v\u1ec7 m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch \u1edf h\u1ea1 ngu\u1ed3n c\u00f3 kh\u1ea3 n\u0103ng c\u1eaft th\u1ea5p h\u01a1n d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng t\u1ea1i v\u1ecb tr\u00ed c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n<h3>UL 489: Ti\u00eau chu\u1ea9n B\u1eafc M\u1ef9<\/h3>\n<p><strong>UL 489<\/strong> l\u00e0 ti\u00eau chu\u1ea9n c\u1ee7a Underwriters Laboratories cho b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac \u1edf B\u1eafc M\u1ef9. C\u00e1c \u0111i\u1ec1u kho\u1ea3n ch\u00ednh bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0110\u1ecbnh ngh\u0129a gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: UL 489 quy \u0111\u1ecbnh r\u1eb1ng m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n l\u00e0 \u201cgi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n\u201d n\u1ebfu n\u00f3 x\u00f3a m\u1ed9t s\u1ef1 c\u1ed1 trong v\u00f2ng ch\u01b0a \u0111\u1ea7y n\u1eeda chu k\u1ef3 (th\u01b0\u1eddng l\u00e0 d\u01b0\u1edbi 10 mili gi\u00e2y \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng 60 Hz).<\/li>\n<li><strong>Th\u1eed nghi\u1ec7m cho qua<\/strong>: Ti\u00eau chu\u1ea9n y\u00eau c\u1ea7u th\u1eed nghi\u1ec7m r\u1ed9ng r\u00e3i \u0111\u1ec3 t\u1ea1o ra c\u00e1c \u0111\u01b0\u1eddng cong d\u00f2ng \u0111i\u1ec7n cho qua hi\u1ec3n th\u1ecb d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh th\u1ef1c t\u1ebf nh\u01b0 m\u1ed9t h\u00e0m c\u1ee7a d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng.<\/li>\n<li><strong>\u0110\u1ecbnh m\u1ee9c ng\u1eafn m\u1ea1ch<\/strong>: UL 489 x\u00e1c \u0111\u1ecbnh \u0111\u1ecbnh m\u1ee9c ng\u1eaft (IR) v\u00e0 thi\u1ebft l\u1eadp c\u00e1c quy tr\u00ecnh th\u1eed nghi\u1ec7m \u0111\u1ec3 x\u00e1c minh hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch \u1edf m\u1ee9c \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c.<\/li>\n<\/ul>\n<h3>Tu\u00e2n th\u1ee7 v\u00e0 Ch\u1ee9ng nh\u1eadn<\/h3>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf v\u00e0 \u0111\u1eb7c t\u1ea3 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, vi\u1ec7c tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n \u0111\u1ea3m b\u1ea3o:<\/p>\n<ul>\n<li><strong>Hi\u1ec7u su\u1ea5t \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh<\/strong>: C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn \u0111\u00e3 tr\u1ea3i qua qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m nghi\u00eam ng\u1eb7t c\u1ee7a b\u00ean th\u1ee9 ba \u0111\u1ec3 x\u00e1c nh\u1eadn kh\u1ea3 n\u0103ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n v\u00e0 kh\u1ea3 n\u0103ng c\u1eaft c\u1ee7a ch\u00fang.<\/li>\n<li><strong>S\u1ef1 t\u1ef1 tin trong thi\u1ebft k\u1ebf<\/strong>: C\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 d\u1ef1a v\u00e0o c\u00e1c \u0111\u01b0\u1eddng cong cho qua \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 v\u00e0 d\u1eef li\u1ec7u I\u00b2t \u0111\u1ec3 ph\u00e2n t\u00edch b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb v\u00e0 t\u00ednh to\u00e1n h\u1ed3 quang \u0111i\u1ec7n.<\/li>\n<li><strong>Ch\u1ea5p nh\u1eadn theo quy \u0111\u1ecbnh<\/strong>: C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch tu\u00e2n th\u1ee7 ti\u00eau chu\u1ea9n \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a quy t\u1eafc \u0111i\u1ec7n trong c\u00e1c th\u1ecb tr\u01b0\u1eddng t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang (khu v\u1ef1c IEC ho\u1eb7c l\u1eafp \u0111\u1eb7t \u1edf B\u1eafc M\u1ef9).<\/li>\n<\/ul>\n<p>C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n VIOX \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 th\u1eed nghi\u1ec7m \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u1ea3 c\u00e1c y\u00eau c\u1ea7u c\u1ee7a IEC 60947-2 v\u00e0 UL 489, \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng \u00e1p d\u1ee5ng tr\u00ean to\u00e0n c\u1ea7u v\u00e0 hi\u1ec7u su\u1ea5t b\u1ea3o v\u1ec7 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh.<\/p>\n<h2>\u1ee8ng d\u1ee5ng, S\u1eed d\u1ee5ng tr\u01b0\u1eddng H\u1ee3p<\/h2>\n<p>C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n mang l\u1ea1i nh\u1eefng l\u1ee3i \u00edch quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n n\u01a1i d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng cao \u0111e d\u1ecda t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 s\u1ef1 an to\u00e0n c\u1ee7a nh\u00e2n vi\u00ean.<\/p>\n<h3>Trung t\u00e2m D\u1eef li\u1ec7u v\u00e0 C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng CNTT Quan tr\u1ecdng<\/h3>\n<p>C\u00e1c trung t\u00e2m d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c v\u1ec1 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1eb7c bi\u1ec7t. C\u00e1c gi\u00e1 m\u00e1y ch\u1ee7 m\u1eadt \u0111\u1ed9 cao, h\u1ec7 th\u1ed1ng UPS m\u1ea1nh m\u1ebd v\u00e0 nhi\u1ec1u ngu\u1ed3n c\u1ea5p \u0111i\u1ec7n ti\u1ec7n \u00edch t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng c\u00f3 th\u1ec3 v\u01b0\u1ee3t qu\u00e1 65kA tr\u1edf l\u00ean. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft trong c\u00e1c m\u00f4i tr\u01b0\u1eddng n\u00e0y:<\/p>\n<ul>\n<li><strong>B\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb CNTT<\/strong>: M\u00e1y ch\u1ee7, m\u1ea3ng l\u01b0u tr\u1eef v\u00e0 thi\u1ebft b\u1ecb m\u1ea1ng ch\u1ee9a c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng ngay c\u1ea3 khi x\u1ea3y ra c\u00e1c s\u1ef1 ki\u1ec7n qu\u00e1 d\u00f2ng ng\u1eafn. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0m gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 xu\u1ed1ng m\u1ee9c ng\u0103n ng\u1eeba h\u01b0 h\u1ecfng th\u00e0nh ph\u1ea7n.<\/li>\n<li><strong>Ph\u1ed1i h\u1ee3p ch\u1ecdn l\u1ecdc<\/strong>: \u0110\u1ed9 tin c\u1eady c\u1ee7a trung t\u00e2m d\u1eef li\u1ec7u ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c c\u00f4 l\u1eadp c\u00e1c s\u1ef1 c\u1ed1 m\u00e0 kh\u00f4ng g\u00e2y ra s\u1ef1 c\u1ed1 theo t\u1ea7ng. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n t\u1ea1o \u0111i\u1ec1u ki\u1ec7n ph\u1ed1i h\u1ee3p gi\u1eefa b\u1ea3o v\u1ec7 th\u01b0\u1ee3ng ngu\u1ed3n v\u00e0 h\u1ea1 ngu\u1ed3n, \u0111\u1ea3m b\u1ea3o ch\u1ec9 c\u00f3 m\u1ea1ch b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1ecb ng\u1eaft.<\/li>\n<li><strong>Gi\u1ea3m thi\u1ec3u h\u1ed3 quang \u0111i\u1ec7n<\/strong>: Nh\u00e2n vi\u00ean b\u1ea3o tr\u00ec th\u01b0\u1eddng xuy\u00ean l\u00e0m vi\u1ec7c tr\u00ean thi\u1ebft b\u1ecb \u0111ang mang \u0111i\u1ec7n. B\u1eb1ng c\u00e1ch gi\u1ea3m d\u00f2ng s\u1ef1 c\u1ed1 \u0111\u1ec9nh v\u00e0 th\u1eddi gian c\u1eaft m\u1ea1ch, c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n gi\u1ea3m \u0111\u00e1ng k\u1ec3 n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 h\u1ed3 quang \u0111i\u1ec7n, c\u1ea3i thi\u1ec7n an to\u00e0n cho ng\u01b0\u1eddi lao \u0111\u1ed9ng v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng gi\u1ea3m y\u00eau c\u1ea7u v\u1ec1 PPE.<\/li>\n<li><strong>L\u1eafp \u0111\u1eb7t nh\u1ecf g\u1ecdn<\/strong>: C\u00f4ng ngh\u1ec7 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n cho ph\u00e9p kh\u1ea3 n\u0103ng c\u1eaft m\u1ea1ch cao (50kA-100kA) trong MCCB nh\u1ecf g\u1ecdn, h\u1ed7 tr\u1ee3 ph\u00e2n ph\u1ed1i \u0111i\u1ec7n d\u00e0y \u0111\u1eb7c m\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft qu\u00e1 kh\u1ed5.<\/li>\n<\/ul>\n<h3>C\u01a1 s\u1edf S\u1ea3n xu\u1ea5t C\u00f4ng nghi\u1ec7p<\/h3>\n<p>C\u00e1c nh\u00e0 m\u00e1y c\u00f4ng nghi\u1ec7p c\u00f3 \u0111\u1ed9ng c\u01a1 l\u1edbn, m\u00e1y bi\u1ebfn \u00e1p v\u00e0 m\u1ea1ng l\u01b0\u1edbi ph\u00e2n ph\u1ed1i r\u1ed9ng l\u1edbn ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi d\u00f2ng s\u1ef1 c\u1ed1 c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng thi\u1ebft b\u1ecb s\u1ea3n xu\u1ea5t:<\/p>\n<ul>\n<li><strong>Trung t\u00e2m \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1<\/strong>: B\u1ea3o v\u1ec7 b\u1ed9 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1, bi\u1ebfn t\u1ea7n v\u00e0 thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed \u0111i\u1ec1u khi\u1ec3n kh\u1ecfi \u1ee9ng su\u1ea5t d\u00f2ng s\u1ef1 c\u1ed1. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n ng\u0103n ng\u1eeba thi\u1ec7t h\u1ea1i cho thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed truy\u1ec1n \u0111\u1ed9ng \u0111\u1eaft ti\u1ec1n v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh li\u00ean t\u1ee5c c\u1ee7a s\u1ea3n xu\u1ea5t.<\/li>\n<li><strong>\u0110\u01b0\u1eddng d\u00e2y c\u1ea5p \u0111i\u1ec7n dung l\u01b0\u1ee3ng cao<\/strong>: \u1ede nh\u1eefng n\u01a1i nhi\u1ec1u ngu\u1ed3n \u0111i\u1ec7n ho\u1eb7c m\u00e1y bi\u1ebfn \u00e1p l\u1edbn t\u1ea1o ra d\u00f2ng s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 50kA, c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 m\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft c\u00f3 kh\u1ea3 n\u0103ng ng\u1eaft m\u1ea1ch cao \u0111\u1eaft ti\u1ec1n trong to\u00e0n h\u1ec7 th\u1ed1ng.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7<\/strong>: Thanh c\u00e1i, m\u00e1ng c\u00e1p v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u00f3 gi\u1edbi h\u1ea1n \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0m gi\u1ea3m l\u1ef1c t\u1eeb trong qu\u00e1 tr\u00ecnh s\u1ef1 c\u1ed1, ng\u0103n ng\u1eeba h\u01b0 h\u1ecfng v\u1eadt l\u00fd cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng ph\u00e2n ph\u1ed1i.<\/li>\n<\/ul>\n<h3>T\u00f2a nh\u00e0 Th\u01b0\u01a1ng m\u1ea1i c\u00f3 M\u1eadt \u0111\u1ed9 \u0110i\u1ec7n n\u0103ng Cao<\/h3>\n<p>C\u00e1c t\u00f2a nh\u00e0 v\u0103n ph\u00f2ng, b\u1ec7nh vi\u1ec7n v\u00e0 trung t\u00e2m b\u00e1n l\u1ebb ng\u00e0y c\u00e0ng tri\u1ec3n khai c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n n\u0103ng cao:<\/p>\n<ul>\n<li><strong>Ph\u00e2n ph\u1ed1i ch\u00ednh v\u00e0 th\u1ee9 ch\u00ednh<\/strong>: C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n tr\u00ean l\u1ed1i v\u00e0o d\u1ecbch v\u1ee5 ch\u00ednh v\u00e0 b\u1ea3ng ph\u00e2n ph\u1ed1i b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i d\u00f2ng s\u1ef1 c\u1ed1 do ti\u1ec7n \u00edch cung c\u1ea5p \u0111\u1ed3ng th\u1eddi cho ph\u00e9p ph\u1ed1i h\u1ee3p hi\u1ec7u qu\u1ea3 \u1edf h\u1ea1 ngu\u1ed3n.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng \u0111i\u1ec7n kh\u1ea9n c\u1ea5p<\/strong>: B\u1ea3o v\u1ec7 m\u00e1y ph\u00e1t \u0111i\u1ec7n v\u00e0 c\u00f4ng t\u1eafc chuy\u1ec3n m\u1ea1ch n\u01a1i nhi\u1ec1u ngu\u1ed3n l\u00e0m t\u0103ng d\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng.<\/li>\n<li><strong>C\u1ea3i t\u1ea1o v\u00e0 m\u1edf r\u1ed9ng<\/strong>: Vi\u1ec7c t\u0103ng c\u00f4ng su\u1ea5t cho c\u00e1c t\u00f2a nh\u00e0 hi\u1ec7n c\u00f3 th\u01b0\u1eddng l\u00e0m t\u0103ng m\u1ee9c d\u00f2ng s\u1ef1 c\u1ed1. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u00f4i khi c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf nhu c\u1ea7u n\u00e2ng c\u1ea5p to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 \u0111\u1ea7y \u0111\u1ee7 trong ph\u1ea1m vi \u0111\u1ecbnh m\u1ee9c c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n<h3>B\u1ea3o v\u1ec7 x\u1ebfp t\u1ea7ng (B\u1ea3o v\u1ec7 d\u1ef1 ph\u00f2ng)<\/h3>\n<p>M\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng c\u00f3 gi\u00e1 tr\u1ecb nh\u1ea5t l\u00e0 cho ph\u00e9p x\u1ebfp t\u1ea7ng ho\u1eb7c \u0111\u1ecbnh m\u1ee9c n\u1ed1i ti\u1ebfp. M\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t \u1edf th\u01b0\u1ee3ng ngu\u1ed3n c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u1edf h\u1ea1 ngu\u1ed3n c\u00f3 kh\u1ea3 n\u0103ng c\u1eaft m\u1ea1ch th\u1ea5p h\u01a1n d\u00f2ng s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng t\u1ea1i v\u1ecb tr\u00ed c\u1ee7a ch\u00fang. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p:<\/p>\n<ul>\n<li><strong>T\u1ed1i \u01b0u h\u00f3a chi ph\u00ed<\/strong>: S\u1eed d\u1ee5ng c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n r\u1ebb h\u01a1n, \u0111\u1ecbnh m\u1ee9c th\u1ea5p h\u01a1n trong khi v\u1eabn duy tr\u00ec kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 \u0111\u1ea7y \u0111\u1ee7.<\/li>\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m k\u1ef9 thu\u1eadt \u0111\u01a1n gi\u1ea3n h\u00f3a<\/strong>: Ti\u00eau chu\u1ea9n h\u00f3a tr\u00ean c\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch th\u00f4ng th\u01b0\u1eddng trong to\u00e0n b\u1ed9 c\u01a1 s\u1edf trong khi b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 tr\u00ean to\u00e0n h\u1ec7 th\u1ed1ng.<\/li>\n<li><strong>T\u00ednh linh ho\u1ea1t c\u1ee7a h\u1ec7 th\u1ed1ng<\/strong>: Th\u00eam m\u1ea1ch ho\u1eb7c t\u1ea3i m\u00e0 kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i n\u00e2ng c\u1ea5p t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u1edf h\u1ea1 ngu\u1ed3n.<\/li>\n<\/ul>\n<h2>Gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n so v\u1edbi B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/h2>\n<p>Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n s\u1ebd l\u00e0m r\u00f5 khi n\u00e0o m\u1ed7i c\u00f4ng ngh\u1ec7 l\u00e0 ph\u00f9 h\u1ee3p.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/industrial-electrical-installation-showing-current-limiting-mccbs-mounted-in-switchgear-panel-with-busbar-connections-and-organized-cable-routing.webp\" alt=\"Industrial electrical installation of current-limiting MCCBs\" \/><figcaption>H\u00ecnh 5: B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t trong thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft c\u00f4ng nghi\u1ec7p \u0111\u1ec3 b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i \u0111i\u1ec7n n\u0103ng cao. C\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y th\u01b0\u1eddng ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi d\u00f2ng s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 50kA, trong \u0111\u00f3 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb v\u00e0 gi\u1ea3m thi\u1ec3u h\u1ed3 quang \u0111i\u1ec7n.<\/figcaption><\/figure>\n<h3>Ph\u01b0\u01a1ng ph\u00e1p ng\u1eaft<\/h3>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/strong>: C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch th\u00f4ng th\u01b0\u1eddng ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 v\u00e0 kh\u1edfi t\u1ea1o c\u01a1 ch\u1ebf ng\u1eaft, nh\u01b0ng cho ph\u00e9p d\u00f2ng s\u1ef1 c\u1ed1 t\u0103ng l\u00ean gi\u00e1 tr\u1ecb \u0111\u1ec9nh ti\u1ec1m n\u0103ng c\u1ee7a n\u00f3. S\u1ef1 ng\u1eaft x\u1ea3y ra t\u1ea1i ho\u1eb7c g\u1ea7n \u0111i\u1ec3m c\u1eaft kh\u00f4ng d\u00f2ng \u0111i\u1ec7n t\u1ef1 nhi\u00ean, th\u01b0\u1eddng l\u00e0 sau 0,5 \u0111\u1ebfn 1,5 chu k\u1ef3 (8-25 mili gi\u00e2y \u1edf 60 Hz). Trong th\u1eddi gian n\u00e0y, to\u00e0n b\u1ed9 d\u00f2ng s\u1ef1 c\u1ed1 g\u00e2y \u1ee9ng su\u1ea5t cho h\u1ec7 th\u1ed1ng.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: C\u00e1c thi\u1ebft b\u1ecb n\u00e0y ho\u1ea1t \u0111\u1ed9ng trong v\u00f2ng mili gi\u00e2y \u0111\u1ec3 c\u01b0\u1ee1ng b\u1ee9c ng\u1eaft d\u00f2ng \u0111i\u1ec7n tr\u01b0\u1edbc khi n\u00f3 \u0111\u1ea1t \u0111\u1ebfn \u0111\u1ec9nh ti\u1ec1m n\u0103ng c\u1ee7a n\u00f3. Th\u00f4ng qua vi\u1ec7c t\u00e1ch ti\u1ebfp \u0111i\u1ec3m \u0111i\u1ec7n \u0111\u1ed9ng v\u00e0 t\u1ea1o \u0111i\u1ec7n \u00e1p h\u1ed3 quang, ch\u00fang x\u00f3a s\u1ef1 c\u1ed1 trong v\u00f2ng ch\u01b0a \u0111\u1ea7y n\u1eeda chu k\u1ef3 (d\u01b0\u1edbi 10 mili gi\u00e2y), gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u1ea3 d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh v\u00e0 t\u1ed5ng n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1.<\/p>\n<h3>D\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh v\u00e0 \u1ee8ng su\u1ea5t c\u01a1 h\u1ecdc<\/h3>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/strong>: To\u00e0n b\u1ed9 d\u00f2ng s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng ch\u1ea3y qua, t\u1ea1o ra l\u1ef1c t\u1eeb t\u1ed1i \u0111a. \u0110\u1ed1i v\u1edbi s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng 50kA, to\u00e0n b\u1ed9 50kA (\u0111\u1ec9nh kh\u00f4ng \u0111\u1ed1i x\u1ee9ng 70kA) t\u1ea1o ra \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc r\u1ea5t l\u1edbn tr\u00ean thanh c\u00e1i, \u0111\u1ea7u n\u1ed1i v\u00e0 k\u1ebft n\u1ed1i.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: D\u00f2ng \u0111i\u1ec7n th\u00f4ng qua \u0111\u01b0\u1ee3c gi\u1ea3m \u0111\u00e1ng k\u1ec3. \u0110\u1ed1i v\u1edbi c\u00f9ng m\u1ed9t s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng 50kA, m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 gi\u1edbi h\u1ea1n \u0111\u1ec9nh th\u1ef1c t\u1ebf \u1edf 15-20kA, gi\u1ea3m l\u1ef1c t\u1eeb 60-70%.<\/p>\n<h3>N\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t (I\u00b2t)<\/h3>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/strong>: Th\u1eddi gian x\u00f3a l\u00e2u h\u01a1n v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh cao h\u01a1n d\u1eabn \u0111\u1ebfn gi\u1ea3i ph\u00f3ng n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t \u0111\u00e1ng k\u1ec3. C\u00e1p, thanh c\u00e1i v\u00e0 k\u1ebft n\u1ed1i h\u1ea5p th\u1ee5 nhi\u1ec7t \u0111\u00e1ng k\u1ec3, c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m h\u1ecfng l\u1edbp c\u00e1ch \u0111i\u1ec7n.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: D\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh gi\u1ea3m v\u00e0 kh\u1ea3 n\u0103ng x\u00f3a c\u1ef1c nhanh l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u00e1c gi\u00e1 tr\u1ecb I\u00b2t, th\u01b0\u1eddng l\u00e0 50-80%. \u0110i\u1ec1u n\u00e0y b\u1ea3o v\u1ec7 l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a c\u00e1p, ng\u0103n ng\u1eeba s\u1ef1 \u1ee7 d\u00e2y d\u1eabn v\u00e0 b\u1ea3o v\u1ec7 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m kh\u1ecfi \u1ee9ng su\u1ea5t nhi\u1ec7t.<\/p>\n<h3>N\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 h\u1ed3 quang \u0111i\u1ec7n<\/h3>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/strong>: D\u00f2ng s\u1ef1 c\u1ed1 cao h\u01a1n v\u00e0 th\u1eddi gian x\u00f3a l\u00e2u h\u01a1n l\u00e0m t\u0103ng n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 h\u1ed3 quang \u0111i\u1ec7n, \u0111\u00f2i h\u1ecfi PPE c\u1ea5p cao h\u01a1n v\u00e0 t\u1ea1o ra c\u00e1c m\u1ed1i nguy hi\u1ec3m an to\u00e0n l\u1edbn h\u01a1n cho nh\u00e2n vi\u00ean b\u1ea3o tr\u00ec.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: \u0110\u1ed9 l\u1edbn v\u00e0 th\u1eddi gian d\u00f2ng s\u1ef1 c\u1ed1 gi\u1ea3m l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 n\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang \u0111i\u1ec7n. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m ranh gi\u1edbi h\u1ed3 quang \u0111i\u1ec7n, gi\u1ea3m y\u00eau c\u1ea7u v\u1ec1 PPE v\u00e0 c\u1ea3i thi\u1ec7n an to\u00e0n \u0111i\u1ec7n t\u1ed5ng th\u1ec3.<\/p>\n<h3>\u0110\u00e1nh \u0111\u1ed5i v\u1ec1 Chi ph\u00ed v\u00e0 \u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/h3>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n<\/strong>: N\u00f3i chung \u00edt t\u1ed1n k\u00e9m h\u01a1n tr\u00ean m\u1ed7i \u0111\u01a1n v\u1ecb. Th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 d\u00f2ng s\u1ef1 c\u1ed1 \u1edf m\u1ee9c v\u1eeba ph\u1ea3i v\u00e0 \u0111\u1ecbnh m\u1ee9c thi\u1ebft b\u1ecb v\u01b0\u1ee3t qu\u00e1 \u0111\u1ea7y \u0111\u1ee7 m\u1ee9c s\u1ef1 c\u1ed1 c\u00f3 s\u1eb5n.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/strong>: Chi ph\u00ed ban \u0111\u1ea7u cao h\u01a1n, nh\u01b0ng c\u00f3 th\u1ec3 gi\u1ea3m t\u1ed5ng chi ph\u00ed h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch:<\/p>\n<ul>\n<li>Cho ph\u00e9p c\u00e1c th\u00e0nh ph\u1ea7n h\u1ea1 ngu\u1ed3n c\u00f3 t\u1ea3i nh\u1eb9 h\u01a1n<\/li>\n<li>Cho ph\u00e9p b\u1ea3o v\u1ec7 x\u1ebfp t\u1ea7ng v\u1edbi c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ecbnh m\u1ee9c th\u1ea5p h\u01a1n<\/li>\n<li>Gi\u1ea3m y\u00eau c\u1ea7u gia c\u1ed1 b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n<\/li>\n<li>B\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb \u0111\u1eaft ti\u1ec1n kh\u1ecfi h\u01b0 h\u1ecfng<\/li>\n<li>Gi\u1ea3m chi ph\u00ed gi\u1ea3m thi\u1ec3u h\u1ed3 quang \u0111i\u1ec7n<\/li>\n<\/ul>\n<h3>Khi n\u00e0o n\u00ean ch\u1ecdn t\u1eebng lo\u1ea1i<\/h3>\n<p><strong>Ch\u1ecdn B\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n khi<\/strong>:<\/p>\n<ul>\n<li>D\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi \u0111\u1ecbnh m\u1ee9c ng\u1eafn m\u1ea1ch c\u1ee7a h\u1ec7 th\u1ed1ng<\/li>\n<li>H\u1ea1n ch\u1ebf v\u1ec1 ng\u00e2n s\u00e1ch l\u00e0 t\u1ed1i quan tr\u1ecdng v\u00e0 m\u1ee9c s\u1ef1 c\u1ed1 kh\u00f4ng bi\u1ec7n minh cho vi\u1ec7c b\u1ea3o v\u1ec7 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/li>\n<li>C\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 ph\u1ed1i h\u1ee3p m\u00e0 kh\u00f4ng c\u1ea7n gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n<\/li>\n<\/ul>\n<p><strong>Ch\u1ecdn B\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n khi<\/strong>:<\/p>\n<ul>\n<li>D\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng v\u01b0\u1ee3t qu\u00e1 20-25kA<\/li>\n<li>B\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m (trung t\u00e2m d\u1eef li\u1ec7u, h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n)<\/li>\n<li>T\u00ecm c\u00e1ch gi\u1ea3m nguy c\u01a1 h\u1ed3 quang \u0111i\u1ec7n<\/li>\n<li>Cho ph\u00e9p b\u1ea3o v\u1ec7 x\u1ebfp t\u1ea7ng \u0111\u1ec3 gi\u1ea3m chi ph\u00ed<\/li>\n<li>Vi\u1ec7c m\u1edf r\u1ed9ng c\u01a1 s\u1edf \u0111\u00e3 l\u00e0m t\u0103ng m\u1ee9c s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c thi\u1ebft b\u1ecb ban \u0111\u1ea7u<\/li>\n<\/ul>\n<h2>Ti\u00eau ch\u00ed l\u1ef1a ch\u1ecdn<\/h2>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn b\u1ed9 ng\u1eaft m\u1ea1ch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n ph\u00f9 h\u1ee3p \u0111\u00f2i h\u1ecfi ph\u1ea3i \u0111\u00e1nh gi\u00e1 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 \u1ee9ng d\u1ee5ng.<\/p>\n<h3>T\u00ednh to\u00e1n D\u00f2ng s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng<\/h3>\n<p>B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean l\u00e0 x\u00e1c \u0111\u1ecbnh d\u00f2ng ng\u1eafn m\u1ea1ch ti\u1ec1m n\u0103ng t\u1ea1i \u0111i\u1ec3m l\u1eafp \u0111\u1eb7t. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi:<\/p>\n<ul>\n<li>Dung l\u01b0\u1ee3ng v\u00e0 tr\u1edf kh\u00e1ng c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p ti\u1ec7n \u00edch<\/li>\n<li>Chi\u1ec1u d\u00e0i v\u00e0 k\u00edch th\u01b0\u1edbc d\u00e2y d\u1eabn<\/li>\n<li>Tr\u1edf kh\u00e1ng c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n ph\u00e2n ph\u1ed1i<\/li>\n<li>\u0110\u00f3ng g\u00f3p t\u1eeb \u0111\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n<\/li>\n<\/ul>\n<p>Nhi\u1ec1u c\u00f4ng ty \u0111i\u1ec7n l\u1ef1c cung c\u1ea5p d\u1eef li\u1ec7u d\u00f2ng ng\u1eafn m\u1ea1ch, ho\u1eb7c c\u00e1c k\u1ef9 s\u01b0 \u0111i\u1ec7n c\u00f3 tr\u00ecnh \u0111\u1ed9 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00ednh to\u00e1n ng\u1eafn m\u1ea1ch b\u1eb1ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ti\u00eau chu\u1ea9n c\u00f4ng nghi\u1ec7p (IEC 60909 ho\u1eb7c ti\u00eau chu\u1ea9n IEEE). Kh\u1ea3 n\u0103ng c\u1eaft t\u1ed1i \u0111a (Icu) c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch ph\u1ea3i \u0111\u00e1p \u1ee9ng ho\u1eb7c v\u01b0\u1ee3t qu\u00e1 d\u00f2ng ng\u1eafn m\u1ea1ch \u0111\u00e3 t\u00ednh to\u00e1n n\u00e0y.<\/p>\n<h3>\u0110\u00e1nh gi\u00e1 c\u00e1c y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb<\/h3>\n<p>C\u00e2n nh\u1eafc nh\u1eefng g\u00ec c\u1ea7n b\u1ea3o v\u1ec7:<\/p>\n<ul>\n<li><strong>Thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m<\/strong>: C\u00e1c trung t\u00e2m d\u1eef li\u1ec7u, h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 thi\u1ebft b\u1ecb vi\u1ec5n th\u00f4ng \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i \u0111\u00e1ng k\u1ec3 t\u1eeb d\u00f2ng \u0111i\u1ec7n th\u00f4ng v\u00e0 I\u00b2t gi\u1ea3m.<\/li>\n<li><strong>\u0110\u1ecbnh m\u1ee9c thanh c\u00e1i v\u00e0 d\u00e2y d\u1eabn<\/strong>: N\u1ebfu d\u00f2ng ng\u1eafn m\u1ea1ch \u0111\u1ea1t \u0111\u1ebfn ho\u1eb7c v\u01b0\u1ee3t qu\u00e1 \u0111\u1ecbnh m\u1ee9c ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch c\u1ee7a thanh c\u00e1i, c\u00e1p ho\u1eb7c c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, th\u00ec vi\u1ec7c h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n tr\u1edf n\u00ean c\u1ea7n thi\u1ebft.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb hi\u1ec7n c\u00f3<\/strong>: Khi m\u1edf r\u1ed9ng c\u01a1 s\u1edf v\u1eadt ch\u1ea5t, c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u0111\u00f4i khi c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng hi\u1ec7n c\u00f3 m\u00e0 kh\u00f4ng c\u1ea7n thay th\u1ebf ho\u00e0n to\u00e0n.<\/li>\n<\/ul>\n<h3>\u0110\u00e1nh gi\u00e1 nhu c\u1ea7u gi\u1ea3m thi\u1ec3u nguy c\u01a1 h\u1ed3 quang \u0111i\u1ec7n<\/h3>\n<p>N\u1ebfu c\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 h\u1ed3 quang \u0111i\u1ec7n ch\u1ec9 ra m\u1ee9c n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 cao \u0111\u00f2i h\u1ecfi PPE m\u1edf r\u1ed9ng ho\u1eb7c t\u1ea1o ra c\u00e1c m\u1ed1i nguy hi\u1ec3m kh\u00f4ng th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c cho ng\u01b0\u1eddi lao \u0111\u1ed9ng, th\u00ec c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u00e1ng k\u1ec3 n\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang \u0111i\u1ec7n. Xem x\u00e9t c\u00e1c t\u00ednh to\u00e1n h\u1ed3 quang \u0111i\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem vi\u1ec7c h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n c\u00f3 l\u00e0m gi\u1ea3m m\u1ee9c \u0111\u1ed9 nguy hi\u1ec3m v\u00e0 c\u1ea3i thi\u1ec7n an to\u00e0n hay kh\u00f4ng.<\/p>\n<h3>C\u00e2n nh\u1eafc c\u00e1c y\u00eau c\u1ea7u ph\u1ed1i h\u1ee3p<\/h3>\n<p>Ph\u1ed1i h\u1ee3p ch\u1ecdn l\u1ecdc \u2014 \u0111\u1ea3m b\u1ea3o ch\u1ec9 b\u1ed9 ng\u1eaft m\u1ea1ch g\u1ea7n nh\u1ea5t v\u1edbi s\u1ef1 c\u1ed1 t\u00e1c \u0111\u1ed9ng \u2014 l\u00e0 r\u1ea5t quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng:<\/p>\n<ul>\n<li><strong>B\u1ea3o v\u1ec7 t\u1ea7ng<\/strong>: N\u1ebfu c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n c\u00f3 kh\u1ea3 n\u0103ng c\u1eaft th\u1ea5p h\u01a1n d\u00f2ng ng\u1eafn m\u1ea1ch c\u00f3 s\u1eb5n, th\u00ec b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u1edf th\u01b0\u1ee3ng ngu\u1ed3n c\u00f3 th\u1ec3 cung c\u1ea5p b\u1ea3o v\u1ec7 d\u1ef1 ph\u00f2ng.<\/li>\n<li><strong>T\u1ea3i quan tr\u1ecdng<\/strong>: C\u00e1c trung t\u00e2m d\u1eef li\u1ec7u, b\u1ec7nh vi\u1ec7n v\u00e0 quy tr\u00ecnh c\u00f4ng nghi\u1ec7p y\u00eau c\u1ea7u c\u00e1ch ly s\u1ef1 c\u1ed1 m\u00e0 kh\u00f4ng g\u00e2y ra s\u1ef1 c\u1ed1 kh\u00f4ng c\u1ea7n thi\u1ebft. C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n t\u1ea1o \u0111i\u1ec1u ki\u1ec7n ph\u1ed1i h\u1ee3p b\u1eb1ng c\u00e1ch gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng th\u00f4ng.<\/li>\n<\/ul>\n<h3>Xem x\u00e9t c\u00e1c \u0111\u01b0\u1eddng cong d\u00f2ng \u0111i\u1ec7n th\u00f4ng<\/h3>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p c\u00e1c \u0111\u01b0\u1eddng cong d\u00f2ng \u0111i\u1ec7n th\u00f4ng (Ip) v\u00e0 I\u00b2t cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n c\u1ee7a h\u1ecd. So s\u00e1nh c\u00e1c \u0111\u01b0\u1eddng cong n\u00e0y v\u1edbi:<\/p>\n<ul>\n<li>\u0110\u1ecbnh m\u1ee9c ch\u1ecbu \u0111\u1ef1ng c\u1ee7a thi\u1ebft b\u1ecb<\/li>\n<li>Gi\u1edbi h\u1ea1n I\u00b2t c\u1ee7a c\u00e1p<\/li>\n<li>M\u1ee5c ti\u00eau gi\u1ea3m n\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang \u0111i\u1ec7n<\/li>\n<li>Y\u00eau c\u1ea7u ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n<\/li>\n<\/ul>\n<h3>X\u00e1c minh tu\u00e2n th\u1ee7 ti\u00eau chu\u1ea9n<\/h3>\n<p>\u0110\u1ea3m b\u1ea3o b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n \u00e1p d\u1ee5ng:<\/p>\n<ul>\n<li><strong>TRUY\u1ec0N th\u00f4ng 60947-2<\/strong> cho c\u00e1c \u1ee9ng d\u1ee5ng qu\u1ed1c t\u1ebf\/c\u00f4ng nghi\u1ec7p<\/li>\n<li><strong>UL 489<\/strong> cho c\u00e1c c\u00e0i \u0111\u1eb7t \u1edf B\u1eafc M\u1ef9<\/li>\n<li>C\u00e1c quy t\u1eafc v\u00e0 y\u00eau c\u1ea7u ch\u1ee9ng nh\u1eadn v\u1ec1 \u0111i\u1ec7n \u0111\u1ecba ph\u01b0\u01a1ng<\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>B\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u0111\u1ea1i di\u1ec7n cho m\u1ed9t ti\u1ebfn b\u1ed9 quan tr\u1ecdng trong c\u00f4ng ngh\u1ec7 b\u1ea3o v\u1ec7 \u0111i\u1ec7n, gi\u1ea3i quy\u1ebft th\u00e1ch th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 d\u00f2ng ng\u1eafn m\u1ea1ch cao trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i. B\u1eb1ng c\u00e1ch ng\u1eaft c\u00e1c s\u1ef1 c\u1ed1 trong mili gi\u00e2y v\u00e0 gi\u1ea3m \u0111\u00e1ng k\u1ec3 d\u00f2ng \u0111i\u1ec7n th\u00f4ng c\u1ef1c \u0111\u1ea1i v\u00e0 \u1ee9ng su\u1ea5t nhi\u1ec7t, c\u00e1c thi\u1ebft b\u1ecb n\u00e0y b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb \u0111\u1eaft ti\u1ec1n, c\u1ea3i thi\u1ec7n an to\u00e0n cho nh\u00e2n vi\u00ean v\u00e0 cho ph\u00e9p thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng linh ho\u1ea1t h\u01a1n.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 \u0111i\u1ec7n v\u00e0 ng\u01b0\u1eddi qu\u1ea3n l\u00fd c\u01a1 s\u1edf l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i \u0111i\u1ec7n c\u00f4ng su\u1ea5t cao \u2014 \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u, c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p v\u00e0 c\u00e1c t\u00f2a nh\u00e0 th\u01b0\u01a1ng m\u1ea1i c\u00f3 d\u00f2ng ng\u1eafn m\u1ea1ch v\u01b0\u1ee3t qu\u00e1 25kA \u2014 c\u00f4ng ngh\u1ec7 h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n mang l\u1ea1i nh\u1eefng l\u1ee3i \u00edch c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c trong vi\u1ec7c b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb, gi\u1ea3m thi\u1ec3u h\u1ed3 quang \u0111i\u1ec7n v\u00e0 t\u00ednh linh ho\u1ea1t trong ph\u1ed1i h\u1ee3p. C\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u00ednh (d\u00f2ng \u0111i\u1ec7n th\u00f4ng Ip, \u1ee9ng su\u1ea5t nhi\u1ec7t I\u00b2t v\u00e0 kh\u1ea3 n\u0103ng c\u1eaft Icu) cung c\u1ea5p d\u1eef li\u1ec7u k\u1ef9 thu\u1eadt c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e1c minh hi\u1ec7u su\u1ea5t b\u1ea3o v\u1ec7 v\u00e0 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng an to\u00e0n, \u0111\u00e1ng tin c\u1eady.<\/p>\n<p>VIOX Electric s\u1ea3n xu\u1ea5t c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf theo ti\u00eau chu\u1ea9n IEC 60947-2 v\u00e0 UL 489, cung c\u1ea5p kh\u1ea3 n\u0103ng c\u1eaft t\u1eeb 35kA \u0111\u1ebfn 100kA v\u00e0 c\u00e1c \u0111\u01b0\u1eddng cong hi\u1ec7u su\u1ea5t th\u00f4ng to\u00e0n di\u1ec7n. \u0110\u1ec3 bi\u1ebft th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt, h\u01b0\u1edbng d\u1eabn \u1ee9ng d\u1ee5ng ho\u1eb7c \u0111\u1ec3 th\u1ea3o lu\u1eadn v\u1ec1 c\u00e1c y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n, h\u00e3y li\u00ean h\u1ec7 v\u1edbi \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a VIOX.<\/p>\n<p><strong>B\u1ea3o v\u1ec7 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng quan tr\u1ecdng c\u1ee7a b\u1ea1n b\u1eb1ng c\u00f4ng ngh\u1ec7 h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh. <\/strong><strong><a href=\"https:\/\/test.viox.com\/vi\/contact\/\">Li\u00ean h\u1ec7 VIOX Electric<\/a><\/strong><strong> \u0111\u1ec3 th\u1ea3o lu\u1eadn v\u1ec1 nhu c\u1ea7u b\u1ea3o v\u1ec7 m\u1ea1ch c\u1ee7a b\u1ea1n.<\/strong><\/p>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 98.5px; left: 54px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 98.5px; left: 54px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 624.312px; left: 54px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 624.312px; left: 54px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Figure 1: Current limiting circuit breakers protect electrical systems by interrupting fault currents before they reach destructive peak values. VIOX Electric manufactures current-limiting MCCBs engineered to IEC 60947-2 and UL 489 standards. &nbsp; In modern electrical systems, short-circuit faults can release devastating amounts of energy in milliseconds. A prospective fault current of 50,000 amperes generates [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20606,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-20604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/comments?post=20604"}],"version-history":[{"count":3,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20604\/revisions"}],"predecessor-version":[{"id":20654,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20604\/revisions\/20654"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/20606"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=20604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=20604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=20604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}