Zero-phase-sequence converter, ground fault current detection device, power conditioner and method for detecting faults of zero-phase-sequence converter

Abstract

Simple and reliable detection of anomalies arising in ZCT. A zero-phase-sequence converter (ZCT) (11) detects zero-phase-sequence current in a plurality of power lines inserted through it, and a line through which a constant DC offset current flows is inserted through a zero-phase-sequence line except for a plurality of power lines Converter.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Japanese Patent Application No. 2012-189308 filed on Aug. 29, 2012, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to a zero-phase-sequence converter, a ground fault current detection device including a zero-phase-sequence converter, a power conditioner including a zero-phase-sequence converter and a ground fault current detection device, and a zero-phase-sequence converter for detecting zero-phase-sequence The method of flow device failure. Background technique [0004] A zero-phase-sequence current transformer (ZCT) is generally installed in a power conditioner to detect a ground fault current flowing when a ground fault occurs. However, when an abnormality occurs, such as when a coil used in a ZCT becomes disconnected, output of a normal value from the ZCT ends even when a ground fault occurs, and th...

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Problems solved by technology

However, when an abnormality occurs, such as when a coil used in a ZCT becomes disconnected, it ends outputting normal values ​​from the ZCT even when a ground fault occurs, and the ground fault cannot be detected

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