Box-Type Transformer Lightning Overvoltage Simulation at Low-Voltage Side in Wind Turbines

doi:10.3969/j.issn.1000-7229.2016.01.020

Abstract

Abstract:

Aimed at damage accidents of box-type transformer outside wind turbine when the top of wind tower being struck by lightning, an ATP/EMTP simulation model is established according to wind turbine-box type transformer system lightning protection, which is based on the mechanism analysis of the lightning overvoltage of box-type transformer at low-voltage side. We use this model to calculate the lightning overvoltage of box-type transformer at low-voltage side when surge protective device (SPD) is connected and disconnected, and analyze the influences of the waveform and peak of lightning current, impulse grounding resistance on the voltage on the low voltage side of box-type transformer. Meanwhile, we calculate the power frequency current after the low-voltage side short circuit of transformer. The calculation result shows that the potential differences of low-voltage side of transformer when SPD is disconnected exceed the impulse withstand voltage 12kV, and the power frequency current at low-voltage side is 4.50-8.75 kA. Because switch-type SPD cannot cut off power frequency current, it is suggested that switch-type SPD should be replaced by zinc oxide arrester (YH10W-0.8/3.0) without follow current, whose lightning protection effect is verified by simulating calculation.

Key words: wind turbines, box-type transformer, ground potential rise, lightning overvoltage, power frequency current, surge protective device（SPD）

CLC Number:

TM 614

MAN Yuwei, YU Guangkai, WEI Huanlin, CHANG Taifu，ZHANG Bo, LU Tiecheng. Box-Type Transformer Lightning Overvoltage Simulation at Low-Voltage Side in Wind Turbines[J]. Electric Power Construction, 2016, 37(1): 131-136.

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