低压开关柜和母线槽动热稳定校验(上)
本帖最后由 bzp4891 于 2017-12-15 09:29 编辑一、低压成套设备的热稳定和动稳定
按照GB7251/IEC61439低压成套开关设备和控制设备标准第2部分：成套电力开关和控制设备和第6部分: 母线干线系统设计、制造的低压开关柜和母线槽，在正常运行情况下，载流导体、内装元器件及壳体的温升值不能超过相关标准；在非正常情况下（如短路），载流导体及其支撑件需要承受短路电流所产生的热效应和电动力效应而不损坏，所以，在低压开关柜和母线槽样本中，成套设备制造厂商一般会提供两个重要参数：
[*]额定短时耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAVCAMAAABrN94UAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADpmADqQAGa2OgAAOjqQOmZmOpDbZgAAZjoAZrb/kDoAkGaQkNv/tmYAtpA6tv//25A629uQ2////7Zm/9uQ//+2///bMp5j7QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAiklEQVQoU72Q4Q6DIBCDqYpusDlRhMH7P+iKJJosx18vuYSkoV97St0y3wnAW0J5wIgRPPpNEvIMHSQhWYyiE+EiWnl0i/jDtdlNRKtFZTMchhdvkKzhW0Xeo/RLtt+83icdImtFfcaJR5k8d4tjSncVqAINno+Ve52iWOVPoLv5a0xYKeoILNucH8rsBewS6H1iAAAAAElFTkSuQmCC：在规定条件下用电流和时间定义的能够耐受的短路电流有效值；
[*]额定峰值耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAXCAMAAAAm/38fAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOjo6OpDbZgAAZpDbZrb/kDoAkDpmkNv/tmYAtrZmttuQtv//25A629uQ2/+22////7Zm/9uQ//+2///bfoLRqwAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAoUlEQVQoU62RwQ7CIBBEGUQEi6CiUvj/D3VoWlPiepOEA9ndeTOLUv88swUwSYoZcCIp43CXCi3AvKRC9TiKSoSLaJWhoziRRnbZvJM9ItLqkYghRQurR8br7Op1XALN1lHEKUr2Z7vc7MkV9vC2sE9clq6JJjEGzuxKOrL7OuTq44X+qjdPbx7nTzIuBt13V0x7LZqRPzn/WBjH5RV/ybwB7x8GgpggyIcAAAAASUVORK5CYII=：在规定条件下能够耐受的短路电流峰值；
二者经常会配对出现，而且需要满足GB7251.1-2013低压成套开关设备和控制设备第1部分：总则 中表7所示的关系（data:image/png;base64,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）：图1和图2所示分别为施耐德Blokset低压开关柜和I-LINE V母线槽的电气参数,图中可以看到额定短时耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAVCAMAAACaPIWZAAAAAXNSR0IArs4c6QAAAFdQTFRFAAAAAAAAAAA6AABmADo6ADqQAGa2OgAAOgA6OgBmOjqQOpDbZgAAZgA6Zra2Zrb/kDoAkGaQkNvbkNv/tmYAtmZmtv//25A62////7Zm/9uQ//+2///bFCt/MgAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAiUlEQVQoU7WQuRLCMAxEVzGJIXaIwcL3/38nTjgKRk0KVElvNLvSAn+vTESr5BJljKiCtN7cmCRerRF/yMfkwcfkixafAu+2zRGpEGnwzU0oGnGbO+7DJYBNZyo09768nP3e5THF6+LL/MPrcr8lNvyxrHYCHj0mJoN8mr/BFP0KOw8e1coXbtpPLWcG8lWDJcgAAAAASUVORK5CYII=和额定峰值耐受电流data:image/png;base64,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有不同等级，比值符合n系数。额定短时耐受电流data:image/png;base64,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和额定峰值耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAXCAMAAAA4Nk+sAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgBmOjqQOpDbZgAAZgA6ZgBmZrb/kDoAkNvbkNv/tmYAtmY6tv//25A62////7Zm/7aQ/9uQ//+2///bmD+c0QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAkUlEQVQoU7VRXQ/CIAxsdX4MBenGKuX//1DLxIUsjYkPNrz0cr27FoC/FiOiNxySiUI6zga5hGExYHGjlZ1/kQbqpRlbt5OmZpTP/S4ltI6qYwmHSKj55RbFKZKwdtMjoBfnIV+XXlVZUOE3ayvWAPkyA43cw2lYh3VA3zM2egl6XY22DuDpIyJ364iwLff9w18rfgcK7dzXawAAAABJRU5ErkJggg==参数是通过型式试验的方式获得，即在试验站提前模拟低压开关柜和母线槽在实际应用中遭遇短路电流时是否能够承受短路电流的热效应和电动力效应，data:image/png;base64,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和data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAXCAMAAAA4Nk+sAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgBmOjqQOpDbZgAAZgA6ZgBmZrb/kDoAkNvbkNv/tmYAtmY6tv//25A62////7Zm/7aQ/9uQ//+2///bmD+c0QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAkUlEQVQoU7VRXQ/CIAxsdX4MBenGKuX//1DLxIUsjYkPNrz0cr27FoC/FiOiNxySiUI6zga5hGExYHGjlZ1/kQbqpRlbt5OmZpTP/S4ltI6qYwmHSKj55RbFKZKwdtMjoBfnIV+XXlVZUOE3ayvWAPkyA43cw2lYh3VA3zM2egl6XY22DuDpIyJ364iwLff9w18rfgcK7dzXawAAAABJRU5ErkJggg==参数决定了母排的材料、规格、数量、母排间距以及绝缘母线夹的材料、强度和布局，在设计、试验定型之后就成了低压开关和母线槽固有的特性。 低压开关柜和母线槽的热稳定是指设备在一定时间内耐受短路电流“热效应”而不损坏的能力,通常用data:image/png;base64,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表示。以图1 Blokset低压开关柜为例，水平母线最小的短时耐受电流data:image/png;base64,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为30kA,短时耐受时间data:image/png;base64,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为1s，则该水平母线的热稳定值：data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAATIAAAAVCAMAAADyxpLNAAAAAXNSR0IArs4c6QAAAH5QTFRFAAAAAAAAAAA6AABmADo6ADqQAGZmAGaQAGa2OgAAOgA6OgBmOjo6OjqQOma2OpCQOpDbZgAAZgA6ZgBmZjoAZjqQZmYAZrb/kDoAkDo6kJA6kNvbkNv/tmYAtmZmtv//25A625Bm29v/2/+22////7Zm/9uQ/9u2//+2///bMN3t+QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAADnElEQVRYR+1Ya3eTQBAFazWotcGqQS0WNYvw//+g81x2dpewyfFLT8M5phZyd+7cedKqul4XKzC1db27GP2sgej67dG4UKLG9Omxcq8en7XrF5Kfu301tfsQXazG+O7/StbXN09nu3ER6GwrRp/2UFV9UmEn1HB1XQMGrsEofR4NPIWTdO5qlaoP033uouSH7+ZQm6CqKovt2Hgi1heFC1POMpYA6QvNU2oMopizQuNJxVcPcs0daoYm547Sy54wxP0CQptBbYLAPQnOaXbkVp/muYd7piid91VpRmpYWwMfO0Sp6UTJItl6NEkkqSEydgkd/vLwHcM3PXCt0s8cahPkbp6GgqY7tegP9Shjc4ErU7Q4d+K90EzUMCpIJqKqTrOTy+vcEUohpQ/mi5wGrfr+QKH5+5kCNLVvfwuLCFUCEslwrK1O+bHBKJJzsU2BK9OxCXqZ0IzU4Ch7czws6HeTV6anFKQaS8+fU4ufA3wQH7jGuyNnM32BJcUrQZWA2Gck7rMjIcgmguMXmwxfmEJYtWkIzVQNY26lANfJQCahvHT5CtHdJpQAptDcsWLzN0g4HQ+3f1SxDGobBLGgkyga2qRTStgoIcmpmQMrb1PhIVMVPKDpb1GHtuaklcVhijaVgjQbG0gjE9Y97jd0OchkXfug5oPZGaHA7DZIs+zk6k2t5V6CY2yGWWbneEjTl4FItmRptVKAF+y1DuaOpjt4g0NetOFEF9tWMhgVIaoIJPk6NptjgDsateYlTLYwA90NzSRJvLm1bFpJPjooU5icusBPmipnlepO5SMdgIrEpFmIKgLpxAQhdGCtUAqbgbdp2z9rSldIM1NWak77c/yVs7o/L1OkCW8atBPdHiXI43ts/GwpaP851CaIXMPsGj/iYadfi6WYopEjki1MxfeQZppji7meA4UFccBDsJPgPcgW2mfwwYfgfkZ9pO7bGA5LoojuwD84RBzDCtTlmnzJoLZBXjJYsOJXw5jb2JCi0q98M/I7ijAVWEgz9XIxBwMWZz/UA0wLDDsmCIxalMo/+BHcz0oW7Cz0X140QCEHh+ANyjz84aQ86KUlWKwEVQDijbHe4XnL0p6h5XuPsalwANi/YBiaGckic7oLwDr+8+u++uVfz+VBcj8v3Eu6y1WML01uP+ywS5jyTu+/JHHyvmKZ4Dume313dG++LH9ukwfJ/atkuDZA56FtE/vccvGD9P5Vs6sCxQr8Axh6gASXk9XEAAAAAElFTkSuQmCC------（式1-1）根据下面公式，可以计算出在1秒内能耐受30kA短路电流的铜母线的最小截面为172mm2，例如选择40*5的铜母线就可以满足30kA/1s情况下的热稳定要求。data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAS4AAAA/CAMAAABpY9X7AAAAAXNSR0IArs4c6QAAAHtQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OgBmOjqQOma2OpCQOpDbZgAAZgA6ZgBmZmY6Zrb/kDoAkDo6kGYAkGaQkJA6kLaQkNvbkNv/tmYAtmY6tv/btv//25A625CQ29uQ29vb2/+22//b2////7Zm/9uQ//+2///bgG9RvgAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAG4ElEQVR4Xu1bC5PTNhCOubtASwMktBQMmLZgO///F7IvSStbsR62RTpznrlMHLTa3c+7q32Yw+H5ekbg/4NA34SvLTW4xcNw3pLXznv1TzszgO1r8NhfC+LQ/bE/oxo89tfiGa58jNsK1lWDR77mRRTtuYgsi6gGjyyByhfXUKUGj3IEciiv7z/lLC9aW4NHkWD5RDVUqcEjX/MiivHN/tZVg0eR8vlE49uv+UQTirZ5WNxkCx6rhczeAEuR2TGYqwpu8oIM8nppDEzt4w8nzfWi7/B3j8fwcn9zzoYmSNDN0ToMv3maxpKwFqC6XhAvROV6IbO6XjRZ10zhUjzGk4C9jUa77tIFfMaDqw/g6UtECSfB3iNmTDCelNGObz/chqt/+Nqxbd7/NfcSkLl3uqF3NU1Cxd0i7PQxnnA5ItcZR2/Ps6eieADWAhfYWRKzX4breAq4mtcs8GLQLTkZdf4cT/jZwcdwZAsDa53DpR+BwIXCXC8Jz+aXwRV0NQ1XivhoFA4uBq19As0ZLUyxZu7mPRL5V4L3rjsVodDlSRw0v/nTHY7gh8rGgMxmVj0YMEU1fXmoWOu6Z8tC6YOuplWZ6XnDEfoGHYmdEZQejmxwFPQx/KXABVT3HfPDtqN7K0HzC0A2HMGGJNSzNRmgCfyZ03v9G+uqcLJUaIYUhz4TjCeZgRI5Huk5wyI8OJvADyAjAMHOXmEaNmPkNSQYruF3PC3u2R/b4MPUqoDBRJJ8ykvdoUjfUGv4A0rRH33VuwJwQQIGnhtLiotNYz0hJEaBLNVrFkAQWi7+JDixUZgzkrTugRJ/IIub1FqKB6d2kNvRbGhHtFCWHWy3Rm+lBo+JOeFJnXpw5Vhijd5KDR6hA0lqeT6ttzlVchsSOY/CrF3DQ/oXEEnwwnTFtUQiskiKRKdQ6pkfU2+NKrG918Nl+xd0WNCJiy2R8RQLsXh8S+ii495rJKTKHbJY3b9Zsc8SabGsk/4FmYhriSxL2wlawb5CsaLFqmRwXMND1Z8q7+B0D3wTPPMMXzCV82/RtnqKV+H8KUN8vdTrrRTuESNbw0PBpb5Cggg1ff/w4QmM588zADm5VeEdvsYzita+VrNcmUVe9kjdZhGxxBdKgrwcRqoGkLKhw8QNjYftbnJrRYJcb9qvjD3gw8G9leStJVWCbywFt7zxctPs50Qe8ReWHFyuEjW9bqxaCUSGb3KrRCAgN7lqdJzW8HBw2YLWmBmhRkhhRcUDA3er0eGer76woamvVC+KqJK6zeKjS4Rr2RmliEcrEt0ZGorylCv4tyIR8d6uOK3xbswaHta6qF+EFxmG7UJicsHmRsC5W4HLjhVwfAWH538Y+GmUJT/4Vhbz2Bove6zh4QYhEn44zccnwGkYgAfGYyYE7lYUp5IeAf78Edpr2AemwQI0mj5/fP/uzB2n9GuNKqlcinnY/oVqaIvLylyE3QxTLjIxdzuXDad7GOTQPemAw8WZOY5rFrjYAKlfYlvYDKSXyzjFQ4pe7FZTMqQG4anYF69DZCDVpxkMhQfELjNOOFXs7BnNf3pwBGV0BZ2dbAfXGR52vfRhUXQ7CC9GIZlQoBpeffnr++X8DcyMsIMv6ZftrYxv3rFJ8XA6pYS1A+lIGSc8bAEoVRwEYTUITxe5cCXmGSjJeHrxCYwanRn/FjIy9LK//ZLaNiT6x3+o3a5OmbhceqBoT64ZmWt68HoD1+MPNQiPM6u9An2gn9RPRhWwStZCDp4E6wLxdYVyu86YwgVCULdaOPIg/O4uiuXTIY1pFuCBSsqrPlxcA/26w22dXUNCr/cnu3FetVeQ5U9frjKqYHeIHjolyPOiISysckaabIevGVzc32ygi+DeHqiNRowfB6VpE1byDnrjCEFSc8TYhp4zCthBGpfb6NgFI7gvbhCewKzuEsrgZoNQ6a2wRjhm5FVpoct7d8TlbVO9XP+G4RLbBW5uEF4XiwRuBMSskyGqcLYG0Vdmhon9DmMtwUm/lWkKl/NBNwhPUKDuEjSs/jVVV4oxNwskouFjh3J/OMa7j7yFgcuG7aBKriEhsY4eGkZKPBS37aVvhylkXYCGbSxy659VkeMQx9zYtU2zLVfQ3XwPUPOggkdqH1s0mUH4dlrus5MZzGfWTFnC1OCRJVD54n/B5ei9v22Gu0FBavAoRyCXkuLsnnCRl+/PI1fvwvUUZ3f+/1M1eBSqn00Gj35vuNC8dueRrXgZATz67ztbF6YKu/Mo0z6fqmteb/D/p5b51uCRr3kRBWQ9idVO0fZEVINHuXR5lH3BNDyPA2bvd9nOylUD19coQGrwKNG9hCZzblTCInc2VcTjmWgbBH4CSs+TZXU3+88AAAAASUVORK5CYII=其中：data:image/png;base64,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—导体最小横截面积，单位为平方毫米mm2I—电流有效值，单位为安（A）;a—系数，铜导体取13，铝导体取8.5；t---电流通过的时间，单位为秒（s）；data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAMAAABxCz6aAAAAAXNSR0IArs4c6QAAAEtQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OgBmOpDbZgAAZgA6ZmY6Zrb/kDoAkNv/tmYAtv//25A629uQ2////7Zm/9uQ//+2///bxPbvXgAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAh0lEQVQoU71PWxICMQgDt77Qrd3u9nH/k0oAZzyAIx8paQlJiX5YMzOnwxf2y93OmdMxJG5rPLfTi8iAaDye3hQMhayl3fRQ64icrV+dzuwU2G8bVeiHsBUuq0Jj1X+Eyoeswb92NstVli1giIqKBW+s87YZOfvVsyIIfmPm1R2ZoYc/vP9Vb6f4BzM+YRl7AAAAAElFTkSuQmCC--短路条件下的温升，单位为开（K），对于裸铜排为180K。根据data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAVCAMAAAB1/u6nAAAAAXNSR0IArs4c6QAAAEVQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OpDbZgAAZgA6ZgBmZrb/kDoAkNv/tmYAtv//25A62////7Zm/9uQ//+2///bGfaXAAAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAhklEQVQoU7VP2RKAIAiE7svKUP//U1OBpmump3hxWPZwAT7G94j1g+OHGaiY37SuPcGEiFNm2e5MtoISWwfDV1uu+ZFAYlYw1RafxKUpbtET4+77JEr/44wls0BEmhYMm4m1wiw+RApLJ70qLGLXcBcdSVykzAGXqx/BInIbHdfcgIvXf8sOM1MExiDoE0gAAAAASUVORK5CYII=不变（能量不变）原则：data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIAAAAAVCAMAAAC5SxYJAAAAAXNSR0IArs4c6QAAAF1QTFRFAAAAAAAAAAA6AABmADqQAGaQAGa2OgAAOgA6Oma2OpDbZgAAZgA6ZgBmZjoAZrb/kDoAkDo6kNv/tmYAtv//25A629vb29v/2/+22////7Zm/9uQ/9u2//+2///b1wNRkQAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAABsUlEQVRIS+2Wa1eDMAyGW6dOQaWuw0uR/v+faW4FCumBIR/th21nJzx58ybpZsz/SQ70tbWPx9ixC9W/XEy4uxyhYD+qezpEABZxCypYaxuqvK3+aMBOVCv5Q2EEotssbB+qPV2p/jF//0rfGH4PInCDPUuUMISloqK7/8Y0kD9wK8zPG2nq64dPEx20aON+KKgpq4Dqa3QYVyfNgoGsIKqv2RNPArccDZWxVFTJli/JH50+Gx4V0xm2V28WVCMsHSV9m1UIdknhXNamo6Owi8zSUbrDo4AbrqdCswaWikqqfGY02cayU1l5AIzGogWMauH7zLORlZYki+jOOPrw1FTAdAi5rFmA2hFCxffZnT5hMWoW4WnLP/gaEPWyTrwG/nSF+yAP0CeCUXDoIsa9goRTFqNSBCeD1/EewgfxPg4yfwTqzhyBClOAKmBARYdCfGW655yVUKCqWbCQD9NSnvjVgKQKhgMFhDKLIubJ+CYG38TGRZGrAeMTPFfRsbfaoYg8GQ45Wg/OFTq8FsCP4b8BxLcNfVSOROTJcCBshT+nBdWrAUMmGWTc0kItHMHJfgFZXSDFvEP5fQAAAABJRU5ErkJggg==，如果短路电流持续的时间为3秒，那么允许通过的短路电流大小为：data:image/png;base64,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。低压开关柜和母线槽的动稳定是指设备承受短路电流“电动力效应”而不损坏的能力。对于平行布置的三相水平母线，当试验电流通过时，中间相所处的情况最为严重，最大作用力data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABcAAAAVCAMAAACaPIWZAAAAAXNSR0IArs4c6QAAAEVQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6Oma2OpDbZgAAZrb/kDoAkNv/tmYAtmY6tv//25A62////7Zm/9uQ//+2///bz+Y3+gAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAjklEQVQoU7VPSxaDIAwMbbGiGI0g9z+qE2oVpNvOgveYJPMh+juC+cDeneQxEW2Da/jnAmrGsELyjUKeq0LyY9Mj+2apGgIu9m1tfq1Kyi3oGZBr+9gdllLzbC6eDT6CGE5frasGlgJO4nsiKbtjQxMkj+0SYmOXLbbhK33qIGvAERcXqO2IjdX6P9ofyjt6IAS4FJNXxQAAAABJRU5ErkJggg==为:data:image/png;base64,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公式中：L为铜排的长度，单位米；D为三相铜排的相间距，单位为米；data:image/png;base64,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为矩形截面导体的形状系数，可根据与导体厚度b、宽度h和中心距D有关的关系式data:image/png;base64,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，可从图4查得。data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABUAAAAXCAMAAADTAfSvAAAAAXNSR0IArs4c6QAAAEhQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OpDbZgAAZgA6Zrb/kDoAkDo6kDpmkNv/tmYAtv//25A62////7Zm/9uQ//+2///bbj5bewAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAg0lEQVQoU5WRbQ+DIAyEe06n7q3aMfj//9RDMxO0iaEfSDiuzxUQqaup/Z4b0quroxzdhtvsECrC4jg4gF+vjmpFmAHIvUVYequERoU3S585oKNrC1iRBp5xHVaT0Pbcc4wvFEfuJ8BRSbjvcp7EGo0PLVROlFv/k23ozD2Xqwbg+kMWShkFXY4QhecAAAAASUVORK5CYII= 为试验峰值电流,单位kA，根据GB7251.1试验要求，试验峰值电流大小一般为额定短时耐受电流data:image/png;base64,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额定峰值耐受电流data:image/png;base64,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，上面式子变换为：data:image/png;base64,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-----（式1-2）在前面已经提到，低压开关柜和母线槽会在试验站进行额定短时耐受电流data:image/png;base64,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和额定峰值耐受电流data:image/png;base64,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试验以验证产品性能达到设计要求，提前模拟三相短路故障时母排的耐受能力，试验设备输出的三相短路峰值电流data:image/png;base64,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要等于低压开关柜和母线槽样本宣称的额定峰值耐受电流data:image/png;base64,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，母排只有经受住了短路峰值电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABUAAAAXCAMAAADTAfSvAAAAAXNSR0IArs4c6QAAAFRQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OgBmOpDbZgAAZgA6ZgBmZrb/kDoAkDo6kDpmkNvbkNv/tmYAtmY6tv//25A62////7Zm/9uQ//+2///bokgq7QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAiUlEQVQoU61RSxKCMAxNEH8gUVMIbXP/e9oWlEGzYTCLLl7m/VKAf4yrx18ZpeM+bcHDYChsMIvN1RAIZzZQWZkJImbuykzvDL5iSM30MShV7OaIRVIw7fonYRebLnGV8jtNbBkK6hAX1Ke7hUspGU4fWOoxB8+UBVWaE72TTbI360Ierf/46vwCxo8Gr27oG48AAAAASUVORK5CYII=产生的电动力，才能判定试验通过。我们以施耐德公司iPM低压开关柜的数据来计算当三相主母排规格为data:image/png;base64,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铜排，短时耐受电流为40kA时主母排上电动力有多大。三相铜排的相间距D查表为75mm，即0.075m；额定峰值耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAXCAMAAAA4Nk+sAAAAAXNSR0IArs4c6QAAADxQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOpDbZgAAZrb/kDoAkNv/tmYAtv//25A62////7Zm/9uQ//+2///b9HRApgAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAhUlEQVQoU62R3Q6AIAhGpbJfI6z3f9c+Wjra6KIt7zzD8wGG8M8RIpocFbs0cLs6xcfcbQ7ex8FrUr6oQzJqpngLn+pUcO7tLFxw0kShyEToCDjp0LjpNAwmzaJYygOkMHL38aqyw1Ucc2+rYeJbUptU97VeLHlAZq1XibdzF+OxCXr99RON0AQ3mdhITAAAAABJRU5ErkJggg===data:image/png;base64,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;data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAARUAAAAeCAMAAAA1gHqnAAAAAXNSR0IArs4c6QAAAFdQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOgA6OgBmOpDbZgAAZgA6Zrb/kDoAkDo6kGaQkJC2kNu2kNv/tmYAtv/btv//25A629vb2////7Zm/9uQ//+2///b/oCwRAAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAADoUlEQVRoQ+1ZW3ubMAyFtWEtDetWVhYu//93zpJ8Eb6AmE2ah/khn78gW0cHyXJOqur/kDEw1s83meVXWN0H3dzWdf30yQPsX7fCXbq61gY0hc+6vlSD+vz24ZY6QzfrL9lMStHlOR1UZvSclqW7bkEfLtX0nYKn6fJ+q5YfH9XgLXOGZqZ4y2ZFjC7PKXA/tyyi+e1Xa7IhpAdMlw6ThU1HFa3HintqZ3+Ax8whRZfnFAlZsTI1T5/juqZYJPObyhMqBDeFVMEKYkG7p2xJPitSdHlOpxd1pqg6wPNFjWsFJXWQFUgVGFNztfucxIoUXR4r4KXqedeBkkqfirEKwlSBoUsL55EKwpMoc0jRMZzHnWIcPW8dsN3Iv/DCUITBaQvZpKcVpgpQo3LFWTtDY7fFtpAsObocp3AYrBvD1KwbrA8XSkTFDqzoKaUKNmje052hnuHJkz7HsZCtN9iODjcAZCHK0cmcOjfgavQuF8JXdaaZCsOl6NI935YOaBnwHeS39Ch05wYeQ83MbbLRnBl8am+VfINjBWt4VIQAbgB8DlbrBlHhBRHfwiMNxgqyMLcXy8o5v0KsG0cDvIqHGo4VypC5hUsCnEQnQWVuLBGSrOzpFlP8FIru67NiQPs/1FwEx9AFTsmBLlLaFduo3TaYJLIovUD4ZCM7o6xMjcqVwbQu4+QguoR5yAq/cT1IHYUVZM4VakfFh0lGe7dcOtE184sqiHrO3L7iiZvsQQfRhebWjSa8gNJR/NWxHqRvKaYzr0q/oF/rhvbEnz/jprxU0LlwK2IFswPaD1GBR4pqRKcQY92gU7pbb8tawlBKmZGkp+6wVDNwYac7ir6Gn8KKdYNOdYXhW/DvR/dRRg+TqTWgO6ELE2Y3hQLpliSnHdE27ySzyuRR3dZHJnodTAfV0x1lFA4lX7pl8qReHYi2JTRbCOi4bvsvF3img2qH28oolnwo3VrRljYJJacSmi2wcli39UV2Ua6MSsXQYpVmZVsZRWChdGtFW82KNXHGxyWxWAAMb+RxRBb15GQRKdUAmhrK/DLdNsGK+npPtC3DisEbjy4qFq8lQhEtihHcypXstjKaqCBcDtefVAWV0GwBJMMbyxVb3KzMV3KyiBRYPL38/ulY2VNGAVkg3TrRVpchmXBxd0MhFyElI443tiwQiwM5WeIM/viYGuqpFNCeMorQAunWirbmyEYTJu7uabYSsICO4Y0tCcTiQE4WOPoLKmlQzkN21awAAAAASUVORK5CYII=，查表得data:image/png;base64,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，则：data:image/png;base64,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 ，这表明当有效值为40kA（峰值电流为84kA）的试验电流流过规格data:image/png;base64,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、长度1米、相间距为75mm的铜排时，产生的作用力为16kN,相当于1.6吨的重物挂在母排上。但是我们还看到该柜体的宽度为800mm，柜宽方向母排上均匀布置3个绝缘母线夹，等于将800mm长的主母排均分，这样0.4米铜排上的电动力为：data:image/png;base64,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。
对低压开关柜和母线槽热稳定和动稳定总结如下：1、低压开关柜和母线槽额定短时耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAVCAMAAABrN94UAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADpmADqQAGa2OgAAOjqQOmZmOpDbZgAAZjoAZrb/kDoAkGaQkNv/tmYAtpA6tv//25A629uQ2////7Zm/9uQ//+2///bMp5j7QAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAiklEQVQoU72Q4Q6DIBCDqYpusDlRhMH7P+iKJJosx18vuYSkoV97St0y3wnAW0J5wIgRPPpNEvIMHSQhWYyiE+EiWnl0i/jDtdlNRKtFZTMchhdvkKzhW0Xeo/RLtt+83icdImtFfcaJR5k8d4tjSncVqAINno+Ve52iWOVPoLv5a0xYKeoILNucH8rsBewS6H1iAAAAAElFTkSuQmCC和额定峰值耐受电流data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAXCAMAAAAm/38fAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOjo6OpDbZgAAZpDbZrb/kDoAkDpmkNv/tmYAtrZmttuQtv//25A629uQ2/+22////7Zm/9uQ//+2///bfoLRqwAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAoUlEQVQoU62RwQ7CIBBEGUQEi6CiUvj/D3VoWlPiepOEA9ndeTOLUv88swUwSYoZcCIp43CXCi3AvKRC9TiKSoSLaJWhoziRRnbZvJM9ItLqkYghRQurR8br7Op1XALN1lHEKUr2Z7vc7MkV9vC2sE9clq6JJjEGzuxKOrL7OuTq44X+qjdPbx7nTzIuBt13V0x7LZqRPzn/WBjH5RV/ybwB7x8GgpggyIcAAAAASUVORK5CYII=是其固有特性，由制造商通过型式试验确定；2、低压开关柜和母线槽的热稳定值等于data:image/png;base64,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，data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAVCAMAAABrN94UAAAAAXNSR0IArs4c6QAAAFFQTFRFAAAAAAAAAAA6AABmADqQAGZmAGa2OgAAOgA6OpDbZgAAZjqQZrb/kDoAkJA6kNv/tmYAtmY6tv/b25A629vb2//b2////7Zm/9uQ//+2///b0XWvVAAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAjElEQVQoU8WQwRKDIAxEE6VSECSWVoH//1ATnbE9xENP5sZs2LcbgJuH0KkJisWgCC0iT5cUidAsmlX1/yEAVh0AcIXgVIPaYheyFMkcOxC/ig3VCwPRvcUylGeq3iyZY+bTpdi9TYvmE9HV8RTWo02L/fTww/y9hAiCIuxf/OUnDzFKInSJ7dQbHcsbcPMFjD0JxBoAAAAASUVORK5CYII=为短时耐受时间；3、低压开关柜和母线槽的动稳定是其承受额定峰值耐受电流data:image/png;base64,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所产生的电动力data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAVCAMAAACE9bUqAAAAAXNSR0IArs4c6QAAAEVQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOpDbZgAAZrb/kDoAkDo6kNv/tmYAtrZmtv/btv//25A62////7Zm/9uQ//+2///b0WlBAwAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAkklEQVQoU71SyxKDIAwMoqJU1Ijy/5/aJaOOEHstBxiy2UcYiP629t7IaiZlyVIMdlVIMLnInQKSN7ooXfBxFNtNDxbF371MzLBJHx2MYHMp5Z4H9RjuAMkXCAKMZ2OFBFMguDrC1hI/3iVzIrT33hEXWRFG4uOshgBn8RIUWMWx6zFAMQsWCDw7RLUzRO3vX/AFItYFSW0hPTsAAAAASUVORK5CYII=的能力，电动力data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAVCAMAAACE9bUqAAAAAXNSR0IArs4c6QAAAEVQTFRFAAAAAAAAAAA6AABmADqQAGa2OgAAOpDbZgAAZrb/kDoAkDo6kNv/tmYAtrZmtv/btv//25A62////7Zm/9uQ//+2///b0WlBAwAAAAF0Uk5TAEDm2GYAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAAZdEVYdFNvZnR3YXJlAE1pY3Jvc29mdCBPZmZpY2V/7TVxAAAAkklEQVQoU71SyxKDIAwMoqJU1Ijy/5/aJaOOEHstBxiy2UcYiP629t7IaiZlyVIMdlVIMLnInQKSN7ooXfBxFNtNDxbF371MzLBJHx2MYHMp5Z4H9RjuAMkXCAKMZ2OFBFMguDrC1hI/3iVzIrT33hEXWRFG4uOshgBn8RIUWMWx6zFAMQsWCDw7RLUzRO3vX/AFItYFSW0hPTsAAAAASUVORK5CYII=的大小与data:image/png;base64,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成正比，与导体相间距成反比。
好文章一篇 帖子里的公式啥的 一直加载不出来，哪位老师能加载出了，麻烦打个PDF发上来 帖子中图片较多，可能存在显示不出来的情况，可双击此帖中图片查看！
照片和公式刷不出来，哪位老师能加载出来了，麻烦打个PDF发上来
页:
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