发明名称 |
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. |
申请公布号 |
US2015168473(A1) |
申请公布日期 |
2015.06.18 |
申请号 |
US201314132830 |
申请日期 |
2013.12.18 |
申请人 |
Enphase Energy, Inc. |
发明人 |
Fornage Martin;Harrison Michael |
分类号 |
G01R31/02;G01R15/00;G01R31/40 |
主分类号 |
G01R31/02 |
代理机构 |
|
代理人 |
|
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. |
地址 |
Petaluma CA US |