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| The Governance Optimization Method and Device Research of Zero-Sequence Current in Distribution Transformer |
| Zhang Zhanlong1, Guo Minyi1, Ye Yunxia2, Lei Jian1, Zhou Jun2, Zhang Jiaming1, Zhou Peng1 |
1. State Key Laboratory of Power Transmission Equipment &
System Security and New Technology Chongqing University Chongqing 400044 China;
2. Electric Power Bureau of Zigong Zigong 643000 China |
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Abstract At present, as the operation of three-phase unbalanced load leads to the long-time higher of zero-sequence current in the three-phase four-wire distribution network, resulting in a short life and losses of transformer, and the existing full capacitive reactive power compensation devices are easy to cause serious overcompensation. Then this paper presents governance optimization method and device of zero-sequence current in distribution transformer, which obtains the required reactive power compensation of the three-phase unbalanced load by real-time calculation and then switches the capacitor of phase to phase and phase to ground dynamically, and then achieve the suppression effect of the zero-sequence current through the transfer of active power and the compensation of reactive power. After system linked on the network, the result shows that under the premise of preventing serious over-compensation, it can effectively inhibit the growth of zero-sequence current, improve the power factor and reduce the losses of distribution transformer; With the using of advanced GPRS wireless communication and monitoring software, the system can offer the staffs with reference information and achieved the effect of energy conservation and emissions reduction.
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Received: 10 October 2013
Published: 29 June 2015
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2015, Vol. 30 
