METHOD AND APPARATUS FOR GROUND FAULT DETECTION

摘要

Method and apparatus for determining a ground fault impedance. In one embodiment the apparatus comprises a voltage divider and a ground fault detection module for (i) determining a first voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the first AC line and the DC line; (ii) determining a second voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the second AC line and the DC line; (iii) determining a differential voltage based on at least one voltage measurement between the first AC line and the second AC line; and (iv) computing the ground fault impedance based on the first voltage, the second voltage, and the differential voltage.

主权项

1. A method for determining a ground fault impedance, comprising:
coupling a voltage divider between a first AC line on an AC side of an inverter and a DC line on a DC side of the inverter; determining a first voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the first AC line and the DC line; coupling the voltage divider between a second AC line on the AC side of the inverter and the DC line; determining a second voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the second AC line and the DC line; determining a differential voltage based on at least one voltage measurement between the first AC line and the second AC line; and computing the ground fault impedance based on the first voltage, the second voltage, and the differential voltage.