智能配电变压器的串变调压和基于漏磁的绝缘故障检测技术

Voltage regulation and insulation fault detection technology of intelligent distribution transformer

为了解决分布式能源接入配电网后电压的频繁波动和双向潮流问题,提出一种基于串联变压器的调压技术。利用真空接触器和晶闸管来控制串联变压器的变比和星-角变换,实现电压的快速调整。分析了基于串联变压器的调压原理及基于真空接触器和晶闸管的混合开关调压技术。此外,还提出了基于漏磁通的绕组绝缘故障监测技术,说明它的原理、实现技术和实验验证原理。分析结果表明,提出的技术能够有效地解决配电网电压频繁波动的问题,提高配电变压器的寿命、降低配电变压器的损耗,同时提高配电变压器的智能化程度和可靠性。

In order to solve the problem of voltage fluctuation and bidirectional power flow due to distributed power generation systems connected to distribution network, a new voltage regulation technology based on series transformer is proposed.By using vacuum contactor and thyristor to control the series transformer tap and star-triangle transformation, the voltage can be regulated quickly and effectively.The voltage regulation principle based on series transformer and the voltage regulation technology based on vacuum contactor and thyristor are analyzed.A winding insulation fault detection technology based on leakage flux is also presented, and its principle, the concrete realization method and experiment verification principle are described too.The analysis shows that the proposed technology can effectively solve the distribution network voltage fluctuation, improve the lifetime of distribution transformer, reduce the loss of distribution transformer, and at the same time, improve the intelligence and reliability of distribution transformer.