Combined application of ultrasonic and ultra high frequency techniques in the partial discharge detection and positioning of gas insulated switchgear

Abstract

Partial discharge live detection of GIS can effectively find internal defects, but it is often interfered by surrounding environmental noise, which affects the correct identification and judgment of defect signals. This paper introduces the application of AE and UHF technique in the live detection of GIS, which successfully recognizes the external interference signal, analyzes the cause of abnormal partial discharge signal based on signal characteristics, and uses the method by calculating time difference to locate the source of the signal. An internal checking on the equipment were conducted based on the test results while the equipment were stopped, and verified the existence of floating fault inside GIS.

Numerical Study on Electromagnetic Coupled Heat Transfer and Ultrasonic Propagation in GIS Busbar Chamber

“…For example, based on Michelson interference principle, Zhou et al [14] had developed a fiber-optic ultrasonic sensor system, and the detection performance for weak ultrasonic signals was experimentally studied. Xiao et al [15] found that the interference of environmental noise could be effectively reduced with combined detection method for ultrasonic and ultrahigh frequency signals. With this method, the defect signals would be correctly identified, and the signal source would also be accurately located.…”