On-line monitoring system and method of 35kV high voltage shunt capacitor

Abstract

The invention discloses an on-line monitoring system and method of a 35kV high-voltage shunt capacitor. The on-line monitoring system of the 35kV high-voltage shunt capacitor mainly comprises a data collecting module, a data transmitting module, a data analyzing module, a display module and a power source supply module, wherein the data collecting module and the power source supply module are located at a high-voltage side of a transformer substation and are respectively used for collecting the running parameters of the capacitor and supplying power to the data collecting module, the data transmitting module achieves optical fiber transmission of data between the high-voltage side and a low-voltage side, and the data analyzing module and the display module are located in an industrial control computer at the low-voltage side and are respectively used for further analyzing the obtained data and storing, outputting and displaying the analysis result. The on-line monitoring system of the 35kV high-voltage shunt capacitor achieves transverse comparison of effective values of current and temperature and longitudinal comparison of capacitance values, and effectively avoids the defect that an existing single-parameter monitoring system is high in missing-judgment rate and false-judgment rate. Meanwhile, FFT conversion of self-adaptive windowing and interpolation is adopted, the accuracy of the harmonic wave analysis is improved, and on-line state monitoring and fault diagnosis on the high-voltage shunt capacitor are facilitated.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of high-voltage electric reactive power compensation equipment, and in particular relates to a multi-parameter 35kV high-voltage shunt capacitor on-line monitoring system and method. Background technique [0002] Shunt capacitor is a kind of electrical equipment widely used in power system. It is mainly used to compensate inductive reactive power, improve power factor, reduce power loss, ensure voltage quality, enhance system stability and improve system transmission power capacity. Its safe operation vital to the entire power system. [0003] In actual production, due to the high field strength environment in which capacitors work, the internal dielectric loss has a cumulative effect during operation, which will eventually lead to capacitor failures. Therefore, it is urgent to develop an online monitoring system for capacitors. [0004] The existing high-voltage shunt capacitor online monitorin...

AI Technical Summary

Problems solved by technology

Since different parameters may be sensitive to different interferences, the above-mentioned monitoring method based on a single parameter is prone to miss or misjudgment;

[0006] 2. The electromagnetic environment of the substation where the high-voltage shunt capacitor is located is complex, and the cable communication medium commonly used in the current monitoring system is easily disturbed by strong electromagnetic fields, so it is not suitable as the communication medium for the high-voltage capacitor online monitoring device;

[0007] 3. The existing harmonic analysis usually uses FFT to decompose the non-sinusoidal periodic function, but in the actual detection, due to the truncation of the measured signal and the fluctuation of the grid frequency, it is easy to cause spectrum leakage effect, which seriously affects the harmonic analysis precision

Images