智能变电站变压器差动保护系统可靠性研究

Reliability Study on Differential Protection System of Intelligent Substation Transformer

研究基于电子式互感器的变压器差动保护过程层网络的组网方案及典型结构,综合分析采用合并单元、智能终端、多合一装置、直采直跳、网采网跳、直采网跳等变压器差动保护方案的可靠性及技术经济指标。计算结果表明采用多合一装置及直采直跳的变压器差动保护系统具有简单可靠性价比高的特点。

This paper investigates the process bus architecture design for transformer differential protection schemes where electronic type current and voltage transformers are employed. Three typical network topology systems are analyzed and the reliability associated are calculated ： （ 1 ） merging units（MUs） are directly connected to relays while intelligent ter- minal units（ITs）are wired to the process bus（2）MUs and ITS are both connected to the process bus（3 ）Integrated MU and IT devices directly connected to process bus. Reliability results show that the MU and IT integrated approach is of higher reliability and cost effective.