Measurement and control method for three-phase four-wire metering device wiring detector

Abstract

The invention discloses a measurement and control method for a three-phase four-wire metering device wiring detector. Through comparing a detection phase voltage and a detection current with a measurement phase voltage and a measurement current in aspects of magnitude and phase difference, whether a three-phase four-wire metering device is in a wiring fault and can not accurately measure three-phase power is determined, electric quantity correction is further carried out, complex hidden false wiring can be automatically detected, correction electric quantity and return electric quantity are calculated, and false alarm is reduced.

Description

[technical field] [0001] The invention relates to a measurement and control method of an automatic detection instrument for wiring of a three-phase four-wire metering device. [Background technique] [0002] In the three-phase four-wire metering device, it is often used to directly connect the voltage line and current line (through the current transformer to the energy meter), or use Y / Y connection voltage transformer and three current transformers to convert high voltage and large current into low voltage. The current signal is introduced into the electric energy meter through the secondary circuit, so there are often wrong wirings that cause serious inaccuracy in electricity metering. At present, only three-phase voltage, voltage phase sequence, total power factor and whether the current is reversed, voltage loss, current loss, etc. can be checked. Detection, it is difficult to achieve accurate automatic detection and identification of complex and concealed wrong wiring, so...

AI Technical Summary

Problems solved by technology

[0002] In the three-phase four-wire metering device, it is often used to directly connect the voltage line and current line (through the current transformer to the energy meter), or use Y / Y connection voltage transformer and three current transformers to convert high voltage and large current into low voltage. The current signal is introduced into the watt-hour meter through the secondary circuit, so there are often wrong wirings that cause serious inaccuracy in power metering

At present, only three-phase voltage, voltage phase sequence, total power factor and current can be tested for phase reversal, voltage loss, current loss, etc. It is difficult to accurately and automatically detect and identify complex and concealed wrong wiring, so measurement and verification personnel are required Blind census at the scene greatly increases the cost of electricity metering operation and maintenance and electricity theft investigation, and after wrong wiring occurs, the error of manual calculation and correction of electricity is large, which is likely to cause disputes and make it difficult to refund electricity charges

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