配电变压器有载调压技术

配电变压器有载调压是实现配电网电压控制的手段之一，有载调压开关是配电变压器实现调压的关键部件，其技术性能的优劣直接影响有载调压配电变压器的安全可靠运行。介绍了配电变压器有载调压开关技术的实现方法，将其分为机械式、电力电子式、复合式三大类，分析了不同有载调压方式的技术实现原理与优缺点，明确了配电变压器有载调压技术的发展方向，以及需要深入研究与关注的重点。

On-load Tap-changing Technology of Distribution Transformer

Because of high penetration level of Distributed Generations (DGs) and rapid growth of Electric Vehicles (EVs) loads, distribution network voltage fluctuation problem becomes more and more prominent. Voltage control of distribution network is of great significance to stabilize voltage and raise voltage passing rate. The on-load tap-changing of distribution transformer is one of the means to realize voltage control of distribution network. On-load tap-changing switch is key component of distribution transformer to achieve voltage regulation. Safe and reliable operation of on-load tap-changing distribution transformer is directly influenced by its technical performance. The on-load tap-changing schemes with free maintenance or no arc and no impact switch have been put forward, but their advantages and disadvantages have not been systematic analyzed. In this paper, application situation of voltage regulation technology at home and abroad is explored. The implementation methods of distribution transformer on-load tap-changing switch technology are described and divided into three categories: mechanical, power electronics and composite. Technical implementation principle and advantages and disadvantages of different on-load tap-changing models are analyzed. Development direction and further study focus of distribution transformer on-load tap-changing technology are also clarified.