HUANG Shilong, WANG Xiaohui, GUO Xumin, et al. Research and Implementation of Partial Discharge in HV Switchgear Using TEV Sensor[J]. High voltageapparatus, 2016, 52(10): 19-26.
HUANG Shilong, WANG Xiaohui, GUO Xumin, et al. Research and Implementation of Partial Discharge in HV Switchgear Using TEV Sensor[J]. High voltageapparatus, 2016, 52(10): 19-26. DOI: 10.13296/j.1001-1609.hva.2016.10.004.
The mechanism of transient earth voltages(TEV)aroused by partial discharge in switchgears and the design mechanism of the TEV sensor are analyzed
the TEV sensor is designed according to its design mechanism and is used to record the TEV information corresponding to three typical PD models in HV switchgears. The original and after-amplifying-modulating TEV signal is analyzed. Detection system is developed combining with TEV sensor
amplifier demodulation and AE method. The system has been tested in several substations. The results show that
the amplitude of TEV original signal is lower than 100 m V
the energy distribution is lied in the frequency of3 MHz to 200 MHz. The designed amplification demodulation circuit has improved the SNR and reduced the difficulty of collecting:Experimental research and field application verify the effectiveness of the system.