Capacitive voltage transformer damper detection method and system

Abstract

The invention relates to the technical field of power equipment fault testing, and discloses a capacitive voltage transformer damper detection method and system. Power frequency voltages with different voltage values under different frequencies are input into a to-be-tested damper of the capacitor voltage transformer, the damping current of each detection point is measured to obtain a volt-ampere characteristic curve under different frequencies, and a damping current measurement value of a preset fault point is extracted from the volt-ampere characteristic curve to be compared with a reference current threshold value of a corresponding fault type. Therefore, fault judgment of the to-be-detected damper is realized. And when the to-be-tested damper does not have a fault, judging whether the to-be-tested damper belongs to a fast saturation type damper, if not, calculating impedance phase difference between different frequencies according to the volt-ampere characteristic curve, and judging whether the to-be-tested damper is a resistance type damper or a resonance type damper according to the impedance phase difference. According to the method, automatic and accurate analysis of the fault and the type of the damper is realized, and the performance of the damper can be quickly judged.

Description

technical field [0001] The invention relates to the technical field of power equipment fault testing, in particular to a detection method and system for a capacitive voltage transformer damper. Background technique [0002] At present, capacitive voltage transformers are widely used to monitor the line or bus voltage between substations. In order to avoid the resonance of the capacitive voltage transformer and protect it from damage when the bad state of the power grid invades, a damper is equipped on the remaining winding of the secondary side of the electromagnetic unit of the capacitive voltage transformer. Commonly used dampers are resistive damper, resonant damper and speed saturation damper. [0003] In the existing detection technology, a single power frequency voltage is applied to the damper through a frequency conversion device, the current of the damper is measured at this time, and the measurement result is analyzed and compared with the factory data, so as to a...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a detection method and system for a capacitive voltage transformer damper, which solves the technical problem that the existing damper detection method cannot accurately determine the type of the damper, and thus cannot quickly determine the performance of the damper

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