数字继电保护装置应用中几个值得注意的问题及解决办法

Several Problems Should be Paid to Attention and Solved in the Applicatmion of Digital Protective Relays

本文论述了数字型继电保护装置中的程序存储器EPROM在现场运行中出现的问题和装置内逆变电源问题，指出现有的装置中大量使用的主要检错手段ROM字节和不能作为运行中检测程序正确性的唯一手段，而应辅之以CRC等检错率较高的方法。110KV及以下电网的数字保护装置内，应配置双逆变电源。

This artical discusses the data-change proleom in the EPROM that is widely used to syore progam in digital protective relay when the relay is in running state. Points out that it must not bethe only way to check and proof the program in running state by the sum of the EPROM byte, some other better way such as CRC(Cyclic Redundancy Check)must be used when check and proof the program in dynamic state. It is also a severc problem when the relay powered by only on. DC-DC power deivce in the protective relay,suggests that double DC-DC power device should be used in the relays when the high volrage (110KV or lower voltage) line protected by only one relay.