System and method for detecting anomaly of secondary wiring of current mutual inductor

Abstract

The invention relates to the field of electricity metering and charging, and discloses a system and a method for detecting anomaly of the second wiring of a current mutual inductor. The system for detecting the anomaly of the second wiring of the current mutual inductor comprises a detection circuit, an analog-to-digital converter (ADC), a digital high-pass filter and an anomaly judging module; the detection circuit comprises an external current mutual inductor, an internal current mutual inductor, a coil, an iron core, a resister and a high-frequency signal source; and the external current mutual inductor, the internal current mutual inductor, the coil, the iron core, the resister and the high-frequency signal source are electrically connected. The invention has the beneficial effects of:not relying on the vector relation of three-phase voltage and current, being applied to a single-phase measuring circuit besides being used in a three-phase measuring circuit; reliably recognizing the situations of non-loaded current wiring and open circuit wiring; conducting 24-hour online detection and real-time monitoring, and having keen reaction, low implementation cost addition, and convenience and simplicity.

Description

technical field [0001] The invention relates to the field of electricity metering and billing, in particular to a system and method for detecting abnormal secondary wiring of a current transformer. Background technique [0002] In electricity metering and billing, voltage transformers and current transformers are usually used. Voltage transformers convert high voltages into low voltages, current transformers convert large currents into small currents, and metering components calculate power consumption based on small signals , and finally multiplied by the transformation ratio to get the real power consumption. Whether the secondary wiring of the voltage transformer and current transformer is correct has a very important impact on accurate measurement. A common method for detecting the secondary wiring of a current transformer is to judge whether a certain phase current is short-circuited by checking the phase relationship between the three-phase voltage, current and zero-se...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the prior art, the present invention provides a system and method for detecting the abnormality of the secondary wiring of the current transformer, which solves the problem that the current detection method cannot distinguish between the open circuit situation and the no-load current, and achieves convenient and fast detection. Purpose

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