Method and system for on-line detection of metering abnormal state of transformer

A technology for measuring abnormalities and transformers, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., and can solve the problem that the abnormal gradient of transformers on the secondary side cannot be detected online in real time
CN110333474APending Publication Date: 2019-10-15CHINA ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA ELECTRIC POWER RES INST
Publication Date
2019-10-15

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Abstract

The invention provides a method and a system for on-line detection of a metering abnormal state of a transformer. The method comprises the following steps of processing historical verification data ofa three-phase transformer of a high-voltage transmission line node to determine an effective value of a secondary side voltage or current; carrying out principal component analysis on the effective value to determine a principal component subspace, a residual subspace, the number of principal components and a Q statistic control threshold value of the secondary voltage or current of the three-phase transformer; computing Q statistic of an effective value of a secondary side voltage or current signal of the three-phase transformer, which is collected in real time; determining whether the three-phase transformer is in an abnormal state or not through comparison of the Q statistic with the control threshold; and finally computing a contribution rate of measured data of each phase of the transformer to the Q statistic, and judging an abnormal phase of the three-phase transformer according to the contribution rate. According to the method and the system, a gradual change metering abnormalstate under an online running condition of the transformer can be effectively detected, and the abnormal transformer can be accurately identified.
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Description

technical field

[0001] The invention relates to the field of electric energy metering, and more specifically, to a method and system for online detection of an abnormal metering state of a transformer. Background technique

[0002] The transformer is an important device in the electric energy metering system. It converts the high voltage on the primary side into a low voltage, and converts a large current into a small current. It is used for power meter measurement, and its accuracy is very high. In order to accurately evaluate the metering status of the transformer, the methods currently used include offline detection method and online detection method. Offline detection is to compare the transformer with the standard transformer when it is offline, and periodically detect the ratio difference and angle difference. , however, the measurement status evaluation at discrete time points is relatively random, and the evaluation effect is difficult to guarantee. Online detection...

Claims

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