摘要
电流互感器暂态饱和问题是造成继电保护装置不正确动作的主要原因之一,针对特高压工程投运前电流互感器暂态特性现场检验缺乏成熟校核方法情况,分析了TPY级电流互感器的工作特性,提出了现场校核TPY级电流互感器暂态特性的判据,结合工程实测数据进行了实例分析;在此基础上进一步分析了非规定循环工作方式工况下的误差特性,结果表明最大瞬时误差不满足要求时必须校核相应差动保护是否可以躲过误差电流。
The transient saturation problem of current transformer is one of the main reasons which cause the mal-operation of relay protection devices. It is necessary to check out the transient characteristics of current transformers before the UHV project put into operation. The working characteristics of TPY class current transformer is analyzed, the transient characteristics criterion for TPY class current transformer are given for field checkout, and a certain manufacturer current transformer is analyzed in detail as an example by using engineering measured data. Further analysis of error characteristics under the condition of non-specified duty cycle mode is made, and the results show that the maximum instantaneous error may not meet the requirements, then whether the differential protection can avoid the differential current must be checked.
出处
《陕西电力》
2017年第5期83-87,共5页
Shanxi Electric Power
关键词
特高压
TPY级
电流互感器
暂态特性
现场校核
UHV
TPY class
current transformer
transient characteristics
field checkout
