特高压换流变压器现场局部放电加压方法研究

Study on Pressure Mode of On-site Partial Discharge Test for UHV Converter Transformer

介绍了±800千伏哈郑直流工程中使用的4类换流变压器,针对规程标准中的试验项目及要求,研究不同种类换流变压器在现场局部放电试验中表现出的性能,对现有试验装备技术参数进行校核计算。针对对称加压方式中,换流变压器阀侧首尾两端表现出不同的入口电容,提出了串联可调电抗的加压方式,限制了加压设备中的环流。通过在直流特高压现场进行试验,验证了本试验方法的可行性和适用性,为今后直流特高压换流变压器的现场交接试验提供了参考。

Four types of converter transformers used in ±800 kV Hami-Zhengzhou UHVDC project were introduced. In view of the test items and requirements of regulations and standards, the partial discharge test of different types of converter transformers were studied, and the technical parameters of test equip- ments were checked and calculated. For symmetry pressure mode, the converter transformer valve sides show different entrance capacitance, and a series adjustable reactance pressure mode was put forward, which can restrict the circulation of the pressure equipment. The feasibility and applicability of this test method were verified through DC ultra high voltage test in the field. It provides She reference for field commissioning test of DC ultra high voltage converter transformer in the future.