Identification and isolation method of through faults of coal mine power supply system

Abstract

The invention provides an identification and isolation method of through faults of a coal mine power supply system, and belongs to a relay protection method of the coal mine power supply system. The steps of the method include that (1) sub intelligent substations are built in substations on the ground and underground, a station level with an area centralized control center is built on the ground to serve as a common station level of all the sub intelligent substations, and the common station level coordinates and controls the sub intelligent substations; (2) a host in the centralized control center collects and comprehensively judges fault information sent from protection and measurement and control modules of the sub intelligent substations to achieve identification and isolation of the faults, displays fault sections and fault types on a displayer and sends out fault alarms; and (3) the sub intelligent substations collect or samples system voltage and current data of each branch circuit, and calculate and judge the various fault types and abnormal operation states, and the sub intelligent substations send out trip orders to breakers at the fault sections to achieve isolation of the various types of faults. The method has the advantages of being easy to carry out, precise in judge and high in reliability.

Description

technical field [0001] The invention relates to a relay protection method for a coal mine power supply system, in particular to a method for identifying and isolating a through-fault of the coal mine power supply system. Background technique [0002] The same voltage level of the coal mine power grid has to pass through multiple substations. Due to the short power supply lines, large differences in operation modes, and excessive short-circuit current, the settings of the quick-break protection of switches at all levels cannot be distinguished. The protection time limit of the power system for the incoming power line of the coal mine power grid is not long, which makes it difficult to coordinate the setting of the upper and lower protections, resulting in multi-level crossing of single-phase leakage faults in the high-voltage power grid of the coal mine. The smart substation technology realizes the sharing of information in the whole station, and provides a new opportunity fo...

AI Technical Summary

Problems solved by technology

[0003]Technical problem: Aiming at the problems existing in the above-mentioned prior art, the present invention provides a coal mine power supply system fault identification and isolation method to solve various faults in the coal mine power supply system Through-fault, especially over-level tripping and non-selective leakage protection

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