High voltage electricity capacitive equipment dielectric loss on-line monitoring method and monitoring system

Abstract

The invention provides a high voltage electricity capacitive equipment dielectric loss on-line monitoring method. The method comprises the steps of synchronously collecting a leakage current signal of monitored equipment, a voltage signal of the output end of a transformer PT and a reference voltage signal of a selected reference voltage source according to a synchronous sampling signal of a synchronous generator; obtaining effective values of the leakage current signal and the voltage signal, a phase difference value between the leakage current signal and the reference voltage signal and a phase difference value between the voltage signal and the reference voltage signal; obtaining data of the effective value and the phase difference values through a wireless communication module; calculating to obtain parameters such as the leakage current of the monitored equipment, the dielectric loss factor and the electric capacity. The invention further provides a high voltage electricity capacitive equipment dielectric loss monitoring system used for implementing the above method. According to the high voltage electricity capacitive equipment dielectric loss on-line detection method, the communication data size in monitoring can be decreased, the defect of timing by using wire communication and a satellite is avoided, and the monitoring cost is reduced.

Description

Technical field [0001] The present invention relates to the technical field of power detection, and in particular to an online monitoring method for the dielectric loss of high-voltage power capacitive equipment for online insulation monitoring of high-voltage power capacitive equipment. The invention also relates to an online monitoring system for the dielectric loss of high-voltage power capacitive equipment. Background technique [0002] In the power industry, most of the failures of high-voltage equipment are manifested as a decrease in insulation level, which in turn leads to breakdown and endangers the safe and stable operation of the power grid. Except for the transmission lines, the high-voltage equipment is placed in the substation, and most of them are capacitive equipment. There are a large number of them. Once a problem occurs, it will directly endanger the safety and stability of the power grid. The monitoring of the insulation condition of high-voltage power capaci...

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Problems solved by technology

[0004] In the above monitoring system, due to the need to achieve precise synchronization between leakage current collection and voltage collection, if an optical fiber communication system is required, it is necessary to precisely control the time delay of all communication channels, which is technically difficult, and each data collection point also requires Equipped with optical transceiver, its cost is very high

Moreover, precise synchronous sampling is adopted. If a satellite timing system is used, satellite clock receiving equipment needs to be installed at each collection point. At the same time, with the increase of monitoring points, the amount of communication data and the calculation processing capacity of the control system will also increase sharply. Therefore, the cost of existing monitoring systems is often high

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