数模转换异常造成保护误动的分析与处理

为了提高变压器保护装置运行的可靠性,避免因继电保护动作不正确对电网的安全运行造成影响,通过对一起变压器保护装置误动原因分析,发现保护装置在软、硬件设计上的缺陷.对软、硬件存在缺陷提出整改措施,以防止该型号设备因同类问题再次误动.经过本次整改措施在现场的实施,以及一段时间的运行检验,证明改进后的装置能有效地监测运行中的各种状态,达到预防异常的作用.

Analysis and Treatment of Protection Misoperation Caused by Abnormal A/D Converter

In order to improve the operation reliability of transformer protection equipment, and to avoid the influence of incorrect action of relay protection to the security operation of power grid, the reason of a misoperation of a transformer protection is analyzed, and defects in the design of software and hardware of the protection are found. Modification measures against such defects are proposed to avoid similar problems in the same type protections. After the implementation of measures in field and a period of operation test, it is proved that modified equipments can effectively monitor all kinds of status in the operation, and thus can avoid abnormal actions.