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MULTI-PHASE VFD SYSTEM WITH FREQUENCY COMPENSATED GROUND FAULT PROTECTION
MULTI-PHASE VFD SYSTEM WITH FREQUENCY COMPENSATED GROUND FAULT PROTECTION
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机译:具有频率补偿接地故障保护的多相VFD系统
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摘要
A multi-phase VFD system with frequency compensated ground fault protection includes a variable frequency drive (VFD) power supply, a motor coupled to the VFD power supply by a plurality of power wires and a relay, an annular magnetic core provided with a sensor winding, where the plurality of power wires extend through the annular magnetic core, an analog signal conditioner, an analog-to-digital (A/D) converter, and a digital processor performing a Fast Fourier Transform (FFT) process on the received digital output of the A/D converter to provide frequency information which is used to develop a frequency equalized transfer function for calculating ground fault current.
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机译:具有频率补偿接地故障保护的多相VFD系统包括可变频率驱动器(VFD)电源,通过多个电源线和继电器耦合到VFD电源的电动机,环形磁芯,带有传感器绕组 ,其中多个电源线通过环形磁芯延伸,模拟信号调节器,模数转准(A / D)转换器和在接收的数字输出上执行快速傅里叶变换(FFT)处理的数字处理器 A / D转换器提供用于开发用于计算接地故障电流的频率均衡传递函数的频率信息。
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