变压器混合式有载分接开关熄弧方法的仿真及试验研究.docxVIP

DOI: 10.13336/j.1003-6520.hve.2014.1 DOI: 10.13336/j.1003-6520.hve.2014.10.030 变压器混合式有载分接开关熄弧方法的仿真 及试验研究 梁贵书 1，晏 阔 1，高 飞 2，李金忠 2 ，汪 可 2，丁本平 3 （1. 华北电力大学电气工程学院，保定 071003；2. 中国电力科学研究院，北京 100192； 3. 山东泰开电力设备有限公司，泰安 271000） 摘 要：变压器传统有载分接开关切换过程中的电弧会显著降低触头寿命和加速变压器油劣化。为了解决该问题， 提出了一种新的混合式有载分接开关方法，并试制了实验室的模型样机。这种方法采用伸缩动触头保证切换时序， 以机械组件的运动实现晶闸管模块的无源触发，以晶闸管辅助机械开关实现切换过程中的熄弧。搭建了熄弧电路 的仿真模型进行仿真，并建立了标准的低压切换试验回路进行试验。仿真结果表明：晶闸管门极触发回路简单可 靠，能有效抑制电弧电压的建立，从而消除电弧。试验结果表明：晶闸管在一个切换过程中会被触发 4 次，其中 2 次电流自然过零关断，2 次被机械开关旁路后关断。仿真与试验结果相互验证，充分说明了提出的混合式有载分 接开关无弧切换方法的可行性。 关键词：有载分接开关；模型样机；晶闸管模块；无源触发；熄弧电路；切换试验 Study on Simulation and Experiments of Method of Extinction Hybrid On-Load Tap Changer in Transformers LIANG Guishu1, YAN Kuo1, GAO Fei2, LI Jinzhong2, WANG Ke2, DING Benping3 (1. Power Engineering Institute of Electrical Engineering, North China Electric Power University, Baoding 071003, China; 2. China Electric Power Research Institute, Beijing 100192, China; 3. Shan Dong Tai Kai Electric Equipment Corporation, Taian 271000, China) Abstract：Arc appears in the switching process of traditional on-load tap changer of transformer significantly, reduces contact life, and accelerates the deterioration of transformer oil. To solve this problem, we developed a procedure of hy- brid on-load tap changer, and made a laboratory prototype following the procedure. In the procedure, telescopic movement moving contacts were adopted to ensure switching timing, mechanical components were used for passively triggering of thyristor modules, and the thyristors were used to assist machinery to extinguish arcs. Moreover, we estab- lished a numerical model of the arc-eliminating circuit to conduct simulations, and set up a standard low-voltage switching test circuit to conduct experiments. The simulations show that the thyristor gate trigger circuit is simple and re- liable, and it is effective in inhibiting the establishment of arc voltage and hence eliminating arcs. The experimental results s