Abstract：It is difficult to achieve the selectivity of leakage protection and short circuit protection, time delay match of over current protection and fault location in the high-voltage power supply system of coal mines. To solve these problems, this paper presents a scheme which could be called the distributed integrated information system of high-voltage power network. The scheme is based on a new kind of distributed Ether CAT protocol, and its core is the master-slave controller. The whole system can be divided into two parts. One is a distributed protection information system, the other a distributed electric monitoring system. The test results show that the real-time performance of the system is reliable and stable, and can meet the requirements of a relay protection system and a supervisory control system.

Keyword：integrated information system;distributed Ether CAT;relay protection;