Transformer substation ungrounded system single-phase grounding online monitoring method based on multi-source data

Abstract

The invention discloses a transformer substation ungrounded system single-phase grounding online monitoring method based on multi-source data. The transformer substation ungrounded system single-phasegrounding online monitoring method comprises the following steps: S1, data acquisition and processing; S2, zero-sequence voltage threshold crossing; S3, analog quantity channel constant value setting; S4, fault recorder starting; S5, AND gate logic judgment; and S6, ungrounded system grounding alarm triggering. According to the transformer substation ungrounded system single-phase grounding online monitoring method, Ua, Ub and Uc are respectively calculated through a computer monitoring system and a fault recorder, zero-sequence voltage U0 is calculated through an algorithm, when the zero-sequence voltage U0 calculated from two different sources is larger than a setting value, the recorder is started, meanwhile, a recorder starting signal is triggered to a computer monitoring background,the computer monitoring system reports a zero-sequence voltage threshold crossing signal, and the computer monitoring system receives the recorder starting remote signaling signal and the zero-sequence voltage threshold crossing remote signal to carry out AND gate logic so as to remind operation and maintenance personnel to carry out processing in time.

Description

technical field [0001] The invention belongs to the technical field of electric power on-line detection, and in particular relates to an on-line monitoring method for single-phase grounding of a substation ungrounded system based on multi-source data. Background technique [0002] At present, in the substation, 35kV voltage level remote signaling, telemetry, and remote control have been connected to the computer monitoring system, but because the collected data has not been processed, the existing resources have not been fully utilized, and the 35kV voltage level in the substation is an ungrounded system , The relay protection device includes an acquisition module, a judgment module, and a memory. Use the acquisition module to collect the three-phase voltage, zero-sequence voltage and zero-sequence current of the line, and compare whether the zero-sequence voltage is greater than the zero-sequence voltage startup threshold through the determination module. After a single-ph...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an on-line monitoring method for single-phase grounding in a substation ungrounded system based on multi-source data, so as to solve the problem that the computer monitoring system in the substation in the prior art fails to issue an acousto-optic alarm for this type of grounding in the above-mentioned background technology, resulting in It is easy to be ignored by operators, and the single-phase ground fault develops into a two-phase fault, which eventually leads to the explosion of the 35kV circuit breaker, which seriously affects the safety of people, power grids, and equipment.

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