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

A power supply system and fault identification technology, applied in the direction of electrical components, circuit devices, etc., can solve the problems of leapfrog tripping of various through-faults and non-selectivity of leakage protection, so as to solve the problem of through-fault power supply, high reliability, Guaranteed selective effect

Inactive Publication Date: 2015-01-21
CHINA UNIV OF MINING & TECH
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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

Method used

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

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Embodiment 1

[0017] Example 1: In figure 1 Among them, the present invention comprises the following steps:

[0018] (1) The ground and underground substations are respectively built as sub-smart substations, and a station control layer with a regional centralized control center is built on the ground as the public station control layer of each sub-smart substation. The public station control layer coordinates and controls each sub-smart substation , the protection and control devices of each sub-smart substation complete the fault identification, and the protection host of the centralized control center completes the judgment of the fault section within the system range. figure 2 shown;

[0019] (2) The regional centralized control center has the function of fault identification and isolation. The regional centralized control center includes a centralized control center host and a display. The centralized control center host collects the fault information sent by the protection and mea...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
Inventor 刘建华张栋梁臧其威刘鹏唐全宋祖磊关侠元航张少冉王冬
Owner CHINA UNIV OF MINING & TECH
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