A metering device secondary circuit detector and its detection method

Abstract

The invention provides a metering device secondary circuit detector and a detection method thereof. The invention discloses a detector capable of rapidly judging whether the metering device secondary circuit has abnormal wiring. The detector comprises a secondary circuit line clamp, a test reference signal generation unit, a test result signal sampling unit, a test result signal testing unit and a display unit. The detector adopts intersectant controllable alternating-current test reference signals to obtain test result signals of each phase wiring by comparing the obtained signals with nominal values to determine the phase with a wiring error and the error type thereof. There is no need to load the detector by switching on the current or investigate the detector wine-by-wire by taking the wires out and switching off the current. The detector can rapidly locate wiring errors in energy meters such as three-phase three-wire meters, and determine error types of the wiring errors. The detector has the advantages of being simple in operation, time-saving and labour-saving.

Description

technical field [0001] The invention relates to the technical field of electric power measurement, in particular to a secondary circuit detector of a metering device and a detection method thereof. Background technique [0002] Electric energy metering devices for power supply lines mainly include voltage transformers, current transformers, secondary circuits and electric energy meters. The voltage transformer and current transformer convert the load current and load voltage in the power supply line into standard current and standard voltage, and then provide them to the electric energy meter for measurement. The wiring circuit from the secondary terminal of the voltage transformer and current transformer to the end of the electric energy meter is called the secondary circuit of the electric energy metering device. [0003] Ensuring that the wiring of the secondary circuit is correct is the prerequisite for the electric energy meter to accurately measure the electricity con...

AI Technical Summary

Problems solved by technology

When the three-phase three-wire electric energy meter is wrongly wired, the electric energy meter will produce many abnormal operation phenomena: sometimes it does not rotate, sometimes it reverses, sometimes it rotates forward and reverse alternately with the change of the load power factor angle, and some rotate forward, but the metering The amount of power output does not match the actual

Since the voltage phase sequence of the voltage transformer can be judged by the phase sequence table, the possibility of error is small, but the phenomenon of reverse connection and series phase of the current transformer is more prominent in actual engineering

Moreover, the installation space of the electric energy metering device, especially the installation space of the transformer room is narrow, which brings great inconvenience to the inspection of wiring and the analysis of wrong wiring

[0005] At present, the wire inspection methods mainly include power-on load detection and power-off wire-to-core detection, both of which have certain limitations and are time-consuming and labor-intensive.

The live load detection uses the calibrator to sample and extract the current and voltage values ​​from the primary side and the secondary side of the transformer for calibration and calculation, and compares the measurement value of the calibrator with the count of the electric energy meter, and the two can be found There are errors in the secondary circuit, but the wrong wiring in the secondary circuit cannot be directly located, and it is not easy to determine the type of wiring error in the secondary circuit

After a power failure, the terminal of the secondary circuit is disassembled, and the core is checked with a multimeter. The operation is time-consuming and laborious, and the detection effect is not satisfactory.

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