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P0924AW

逆变器保护

1）瞬时过电流保护。由于逆变器负载侧短路等，流过逆变器器件的电流达到异常值（超过容许值）时，瞬时停止逆变器运转，切断电流。变流器的

输出电流达到异常值，也同样停止逆变器运转。

2）过载保护。逆变器输出电流超过额定值，且持续通达规定的时间以上，为了防止逆变器期间、线路等损坏要停止运转。恰当的保护需要反时限特性，采用热继电器或者电子热保护（使用电子电路）。过负载是由于负载的GD（惯性）过大或因负载过大使电机堵转而产生的。

3）再生过电压保护。采用逆变器使电动机快速时，由于再生功率直流电路电压将升高，有时超过容许值。可以采取停止逆变器运转或快速减速的办法，防止过电压。

4）瞬时停电保护。对于数毫秒以内的瞬时停电，控制电路工作正常。但瞬时停电时间在10s以上时，通常会使控制电路误动作，主电路也不能供电，所以检出后使逆变器停止工作。

5）接地过电流保护。逆变器负载侧接地设计，为了保护逆变器，有时要有接地过电流保护功能。但为了确保人身安全，需要装设漏电断路器。

6）冷却风机异常。有冷却风机的装置，当风机异常时装置内的温度将上升。因此采用风机热继电器或器件散热片传感器，检出异常后停止逆变器。

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P0924AW

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