公开(公告)号：US09383399B2

公开(公告)日：2016-07-05

申请号：US14043065

申请日：2013-10-01

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: G01R31/14 ,  G01R31/02 ,  G01R31/42

CPC classification number: G01R31/025 ,  G01R31/42

Abstract: A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first input A coupled to a first phase PHA of the HRG system, a second input B coupled to a second phase PHB, and a third input C coupled to a third phase PHC, with the HRG ground fault detector generating a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC. The simulated neutral voltage VN′ has a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal. The HRG ground fault detector further compares the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detects a HRG ground fault if the simulated neutral voltage VN′ exceeds the threshold.

Abstract translation: 提供了一种用于检测高阻地（HRG）系统中的接地故障的HRG接地故障检测器和方法。 一个示例性实施例中的HRG接地故障检测器包括耦合到HRG系统的第一相PHA的第一输入A，耦合到第二相PHB的第二输入B和耦合到第三相PHC的第三输入C， HRG接地故障检测器从第一相PHA，第二相PHB和第三相PHC产生模拟中性点电压VN'。 当第一相PHA，第二相PHB和第三相PHC相等时，模拟中性点电压VN'具有零电压电位。 HRG接地故障检测器还将模拟中性点电压VN'与预定的故障电压阈值进行比较，并且如果模拟中性点电压VN'超过阈值，则检测HRG接地故障。

公开(公告)号：US20150091582A1

公开(公告)日：2015-04-02

申请号：US14043065

申请日：2013-10-01

Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.

Inventor： Lixiang Wei ,  Jiangang Hu ,  Jeffrey D. McGuire

IPC: G01R31/02

CPC classification number: G01R31/025 ,  G01R31/42

Abstract: A HRG ground fault detector and method for detecting a ground fault in a High Resistance Ground (HRG) system are provided. The HRG ground fault detector in one example embodiment includes a first input A coupled to a first phase PHA of the HRG system, a second input B coupled to a second phase PHB, and a third input C coupled to a third phase PHC, with the HRG ground fault detector generating a simulated neutral voltage VN′ from the first phase PHA, the second phase PHB, and the third phase PHC, wherein the simulated neutral voltage VN′ comprises a zero voltage potential when the first phase PHA, the second phase PHB, and the third phase PHC are equal, comparing the simulated neutral voltage VN′ to a predetermined fault voltage threshold, and detecting a HRG ground fault if the simulated neutral voltage VN′ exceeds the threshold.

Abstract translation: 提供了一种用于检测高阻地（HRG）系统中的接地故障的HRG接地故障检测器和方法。 一个示例性实施例中的HRG接地故障检测器包括耦合到HRG系统的第一相PHA的第一输入A，耦合到第二相PHB的第二输入B和耦合到第三相PHC的第三输入C， HRG接地故障检测器从第一相位PHA，第二相位PHB和第三相位PHC产生模拟中性点电压VN'，其中模拟中性点电压VN'包括当第一相位PHA，第二相位PHB ，并且第三相PHC相等，将模拟中性点电压VN'与预定故障电压阈值进行比较，并且如果模拟中性点电压VN'超过阈值则检测HRG接地故障。