Analysis on the Characteristics of Short-tail Voltage Wave of Insulator on the Double-circuit Transmission Line in Back Flashover and Design of the Experiment Circuit

作者：Han, Yongxia^*; Ruan, Yaoxuan; Zhang, Yaqi; Liu, Gang; Zhang, Yi; Cai, Hansheng

来源：High Voltage Engineering, 2018, 44(3): 772-778.

DOI：10.13336/j.1003-6520.hve.20180301014

• 110 kV
• Back flashovers
• Design of the experiment
• Double-circuit transmission lines
• Grounding resistance
• Impulse generators
• Lightning current models
• PSCAD/EMTDC simulations

Lightning is the main reason for the trip of transmission line, however, the lightning flashover criterion based on standard lightning impulse has some limitations in back flashover criterion calculation, thus it is necessary to research the simulation and experiments on the short-tail voltage wave under transmission line back flashover. Based on the PSCAD/EMTDC simulation software, we established a back flashover model of the 110 kV double-circuit transmission line. Meanwhile, we simulated and analyzed the influences of the tower height, lightning current model (double exponential wave and heidler wave) and grounding resistance on the waveforms. Based on the present impulse voltage generator in the laboratory, the impulse voltage circuit that meets the requirement of different short-tail voltage waveform was designed, and the experiment was carried out. The results of simulation show that the wavefront of short-tail voltage wave is shorter if towers are higher. The peak, the wavefront, and the wavetail decrease obviously with the decrease of grounding resistance, and the short-tail voltage wave generated by double exponential current is different from that generated by heidler current. In addition, the wavefront is between 0.2~2.0 μs and the the wavetail mainly focuses on 5~10 μs. The experimenal results show that the insulator U50%under short-tail voltage wave is higher than that under standard lightning wave by 25%~30%, which shows that the backflashover criterion under these two kinds wave has a large difference, thus the waveform of impulse voltage greatly influences the backflashover withstand calculation result.

• 出版日期2018-3-31
• 单位华南理工大学; 南方电网科学研究院有限责任公司