The problems should be paid attention to when relay installations are applied particularly in under-mine and common examinations of relay installations in day to day work.

A discuss on reforming relay circuit with PLC;

Relay Contact Resistance Dynamic Testing;

Adaptive distance relay for preventing error action of reactive fault;

Some thought about development target of testing for relay protection equipment;

Discussion on the feasibility study and the construction thought of Ningxia Power Grid relay protection and fault information main station system;

Operative mode analysis of relay protection in grid operating procedure;

The analysis of the failure of feeding breaker not being triggered while leakage relay acting;