Study on Mechanical Vibration Characteristics of GIS Equipment under Variable Frequency Currents

X. Li¹, J. Hao¹, Q. S. Liu¹ , R. L. Gong², X. P. Jiang³, Y. L. Ding¹

1.  State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing, 400044, China

2.  Technology Center Shandong Taikai High-Volt Switchgear Co., Ltd

Taian, 271000, China

3.  State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute,

Chongqing, 400044, China

E-mail：1693950161@qq.com

Purpose

Mechanical vibration signals of GIS equipment are important information to reflect the operating status of equipment, but the vibration excitation of existing research is mostly based on a single power frequency current, and the detection effect has certain limitations. Therefore, this paper carried out research on GIS mechanical vibration characteristics under variable frequency current excitation.

Firstly, the mechanical vibration simulation platform of 110 kV GIS equipment under variable frequency current excitation was built. Then, the vibration signals generated by the equipment shell were collected based on the mechanical vibration detection system. Finally, the evolution laws of time domain and frequency domain vibration spectra of GIS equipment under different current frequencies and loads were studied.

Results show that the frequency and amplitude change of excitation currents both affect the amplitudes and spectral distributions of vibration signals, and the frequencies of excitation currents are closely related to vibration characteristics of GIS equipment. With the increase of excitation current amplitudes, vibration signals amplitudes increase, the main harmonic responses are twice of excitation current frequencies.

Under the action of variable frequency currents, the vibration signals produced by the GIS equipment have obvious vibration characteristics. It is beneficial to obtain overall information of GIS equipment operating status by using variable frequency current in vibration detection.

Appendix