特高压变压器用油技术指标及若干问题探讨

Discussion on Technical Specifications and Some Issues for UHV Transformer Oil

目前,关于绝缘油的IEC标准和GB标准均不能满足特高压工程建设的需要,特高压工程标准还没有涵盖绝缘油的所有检验环节。鉴于特高压工程的特殊要求以及变压器油检验环节多、检验项目多、参照标准多、部分技术指标规定不一致等,将变压器油技术指标重新分类为固有特性指标、化学特性指标、电气质量指标和特征量指标,在此基础上形成特高压变压器用油技术指标一览表,并对其所涉及的若干问题进行探讨,如油的击穿电压及其影响因素、氧化安定性及其相关检测指标等,以供参考。

All of the current standards concerning insulation oil including IEC standards and GB standards can＇t satisfy the requirements of UHV transmission project, and such rules or regulations constituted for UHV transmission project have not yet been covered on the entire inspection test procedures. In view of special requirements of insulation oil by UHV transmission project and the fact that the inspection test procedures of UHV transformer oil are complicated, including numerous items, referring to various standards and some technical specifications by certain regulations or rules that are different from each other. Firstly, all of the technical specifications concerning transformer oil were sorted into four groups, i.e. inherent property indexes, chemical property indexes, electrical performance indexes and diagnostic characteristics in this paper, then based on above classification, the technical specification table for UHV transformer oil was constituted. Therefore, some relevant issues such as breakdown voltage and its influence factors, oxidation stability and its relevant detection indexes were discussed in details for reference.