On-line monitoring system and method for transformer station lightning invasion wave

Abstract

The invention discloses an on-line monitoring system and system for transformer station lightning invasion wave, which are applicable to on-line monitoring of the transformer station lightening invasion wave. The on-line monitoring system comprises at least three data collection terminals, a data center station and a remote access terminal; the data collection terminal is installed on a wire inlet terminal of the transformer substation for monitoring the invasion wave and power frequency current; voltage data is uploaded to the data center station in a wireless transmission mode; the data center station autonomously finishes analysis and diagnosis on the lightening invasion wave, determines a lightening type and counts and records related diagnosis data like overvoltage magnitude, times, etc, of the invasion wave under various types of lightening, analyzes a causes of a transformer substation accident, evaluates the effect on an insulation safety state and service life of a device by the invasion wave and an influence law of surges caused by various types of lightening on a power transmission line on the transformer substation, and transmits a diagnosis result to a remote access terminal. The on-line monitoring system and method have very important meaning to making preventive measurements for transformer station switch device lightening invasion wave and improving accident checking efficiency.

Description

Technical field [0001] The invention relates to the related technical field of online lightning fault monitoring, in particular to an online monitoring system and method for lightning intrusion waves in substations, and is mainly applied to the monitoring and diagnosis of intrusive wave faults in substations. Background technique [0002] The intrusion wave generated by lightning strikes on the transmission line is one of the important factors that cause the aging and damage of the equipment in the substation, which seriously threatens the safe operation of the substation and the entire power system. As far as the traditional online monitoring technology for substations is concerned, the incoming current signal is mainly obtained from the secondary side of the current transformer using the fault recorder in the station. However, due to the limitation of the amplitude-frequency characteristics of the transformer, the frequency of the incoming wave is as high as megahertz. The over...

AI Technical Summary

Problems solved by technology

As far as the traditional substation on-line monitoring technology is concerned, the incoming current signal is mainly obtained from the secondary side of the current transformer by using the fault recording device in the station. There are problems such as waveform distortion in the overcurrent signal, and the intrusion wave overvoltage signal cannot be obtained, and the transient impact characteristic information of different types of lightning strikes on the substation cannot be accurately obtained

Since the intrusion wave monitoring technology of the substation is not yet mature, the following problems mainly arise: First, when the substation equipment fails, it is difficult to judge whether the cause is inside the station or outside the station, which reduces the efficiency of accident investigation; secondly, the frequency of intrusion waves in the substation and the lack of records and statistics of overvoltage levels, resulting in a lack of basis for the insulation status and life assessment of equipment in the station; finally, the intrusion waves generated by different types of lightning strikes on transmission lines have insufficient understanding of the transient impact characteristics of substations, and it is impossible to evaluate shielding The degree and law of the impact of intrusive waves on substations

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