CVT verification method based on rolling time window-FCM clustering, equipment and medium

Abstract

The invention provides a CVT verification method based on rolling time window-FCM clustering, equipment and a medium. The CVT verification method comprises the following steps: S1, acquiring secondary side measurement data of a normally operating CVT and a to-be-verified CVT; s2, analyzing and processing the obtained voltage data through an FCM clustering algorithm, and calculating the clustering center distance of each rolling time window; s3, calculating an average value of clustering center distances of all windows of the normally operating CVT; s4, obtaining a standard ratio through calculation according to the clustering center distance and the average value; and S5, comparing the obtained standard ratio with a set standard ratio threshold value, and outputting an error verification result of the to-be-verified CVT. According to the method, the rolling time window-FCM clustering joint algorithm is utilized, and under the condition of uninterruptible power supply, the error range grade of the CVT is identified by performing clustering analysis on the secondary side metering data of the CVT, the position of a sensor needing power failure inspection is locked, and the workload of power failure detection is reduced.

Description

technical field [0001] The invention relates to the technical field of power system equipment calibration, in particular to a rolling time window-FCM clustering-based CVT calibration method, equipment and medium. Background technique [0002] CVT, that is, capacitive voltage transformer is divided by series capacitors, and then stepped down and isolated by electromagnetic transformer. It is used as a voltage transformer for meters and relay protection. Capacitive voltage transformer can also convert carrier Frequency coupling to transmission lines for long-distance communication, remote measurement, selective line high-frequency protection, remote control, teletype, etc. Compared with the conventional electromagnetic voltage transformer, CVT can prevent the ferromagnetic resonance caused by the saturation of the iron core of the voltage transformer and has great advantages in economy and safety. [0003] The traditional CVT verification method needs to be carried out in the...

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Problems solved by technology

[0003] The traditional CVT verification method needs to be carried out in the event of a power outage, that is, the standard transformer is used to compare the error with the evaluated transformer. Due to the extensive coverage of power transmission and transformation lines, all CVTs are "power outage-detection-recovery" one by one. The detection method has the disadvantages of cumbersome process, heavy workload and low efficiency, and it is difficult to meet the actual needs of power system monitoring.

[0004] For this problem, some prior art implements CVT on-line monitoring to avoid power outages for detection. Measure the voltage on the secondary side of the intermediate transformer of the voltage transformer, measure the ground current of the capacitor voltage transformer, and monitor the fault type of the capacitor voltage transformer according to the measured voltage and the ground current. Although CVT online monitoring can be realized, special detection devices need to be configured, and the efficiency is not high for the detection of large-scale transformers, and it cannot be used in situations where there are many transformers and a wide range of configurations.

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