Voltage transformer error test power frequency resonance step-up automatic test method in GIS (geographic information system)

Abstract

The invention relates to a voltage transformer error test power frequency resonance step-up automatic test method in a GIS (geographic information system). An error test method of a voltage transformer Px in the GIS comprises the following steps of: sending out an automatic tuning instruction by a PC (personal computer) machine to control an alternating voltage signal of which the output frequency of a frequency conversion resonance test power supply is 30-300Hz; searching the initial resonant frequency f1 of a second series resonant circuit according to resonance voltage feed back by a resonance monitoring input end; reading the initial resonant frequency f1 by the PC machine; computing the capacitance of GIS pipeline distributed capacitance Cx; computing the inductance value L50 of a GIS pipeline voltage transformer Lx when the frequency is 50Hz; searching the iron core extension length d2 which corresponds to the L50 in database; and displaying the iron core extension length d2 by the PC machine. The method has the advantages that the automatic test of the power frequency resonance step-up when the voltage transformer field error test in the GIS is carried out can be realized, and the efficiency of field test can be improved.

Description

technical field [0001] The invention relates to a power frequency resonance step-up automatic test method for a voltage transformer error test in a GIS. Background technique [0002] According to the relevant regulations of the national electric power department, the power grid operation enterprises should carry out the on-site error test of the gateway metering transformer regularly every year. The verification cycle of the electromagnetic voltage transformer is ten years, and the verification cycle of the capacitive voltage transformer is four years. The transformers newly put into operation must be tested for errors, and the task of on-site testing is relatively heavy. [0003] For voltage transformers installed in fully enclosed combined electrical appliances (GIS), due to the existence of distributed capacitance in pipelines, and the different sizes and specifications, lengths and wiring arrangements of GIS gas chamber pipelines, the capacitance of GIS pipelines varies....

AI Technical Summary

Problems solved by technology

However, due to the uncertainty of the capacitance of the pipeline, the resonant frequency of 50 Hz needs to be adjusted repeatedly during the field test, which is time-consuming and laborious, and the work efficiency is low, which brings new difficulties to the field error test of the transformer. General Problems Facing Electromagnetic Voltage Transformer Error Test in GIS

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