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Self-adaptive selective leakage protection system and method for mine low-voltage electric network

A low-voltage power grid, leakage protection technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, information technology support system, etc. Leakage protection function and other issues

Active Publication Date: 2013-12-11
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leak detection relays all contain zero-sequence reactors. Manually adjusted zero-sequence reactors will appear in full compensation and over-compensation states due to changes in the operation mode of the power grid or cutting off part of the power supply line for some reason, so that the power direction of the device will be protected. Enter the dead zone and lose the selective leakage protection function
Moreover, the existing direct current detection type total leakage detection relay can only detect the ground insulation resistance of the power grid, but cannot detect the ground capacitance, can only detect the ground insulation resistance of the power grid, and cannot give a specific The insulation condition of the branch circuit cannot easily judge and select leaks

Method used

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  • Self-adaptive selective leakage protection system and method for mine low-voltage electric network
  • Self-adaptive selective leakage protection system and method for mine low-voltage electric network
  • Self-adaptive selective leakage protection system and method for mine low-voltage electric network

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Embodiment Construction

[0086] Such as figure 1 As shown, the self-adaptive selective leakage protection system of mine low-voltage power grid according to the present invention includes a microcontroller module 1 and a communication circuit module 3, and the input terminal of the microcontroller module 1 is connected with an A / D conversion circuit module 4 , leakage test circuit module 5, clock circuit module 6 and key operation circuit module 7, the input terminal of described A / D conversion circuit module 4 is connected with noise elimination and filter circuit module 8, described noise elimination and filter circuit module 8 The input terminal is connected with grid voltage and zero-sequence voltage transmission and conversion circuit module 9 and a plurality of branch zero-sequence current transmission and conversion circuit modules 10, and the output terminal of the microcontroller module 1 is connected with a liquid crystal display circuit module 11 and leakage tripping output circuit module 1...

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Abstract

The invention discloses a self-adaptive selective leakage protection system and method for a mine low-voltage electric network. The system comprises a microcontroller module, double Ethernet communication circuit modules, an A / D (Analog-to-Digital) conversion circuit module, a leakage testing circuit module, a key operation circuit module, a noise elimination and filter circuit module, an electric network voltage and zero sequence voltage transmission circuit module, a plurality of branch zero sequence current transmission circuit modules, a liquid crystal display circuit module and a leakage tripping output circuit module. The method comprises the following steps: firstly, signal acquisition; secondly, signal collection, storage, analysis and processing; thirdly, manual leakage test existence judgment; fourthly, manual leakage test failure judgment and judged result output; fifthly, insulation parameter measurement and storage; sixthly, electric network leakage judgment; and seventhly, electric network leakage judged result output and leakage protection. The self-adaptive selective leakage protection system is novel and reasonable in design, strong in self-adaptability for different network structures of a mine power supply system, high in leakage detecting speed, reliable and accurate in action and high in popularization and application values.

Description

technical field [0001] The invention relates to the technical field of mine power supply safety, in particular to an adaptive selective leakage protection system and method for mine low-voltage power grids. Background technique [0002] The underground space of the coal mine is small, the heat dissipation is unfavorable, the air is humid, and there are flammable and explosive gas and coal dust. In this special production environment, strict protection measures must be taken for leakage that may cause electric sparks. The leakage protection of general mine power grid must be quickly judged, accurately select the leakage branch, and reliably act on the trip. In the existing selective leakage protection device, the starting criterion (judgment of whether leakage fault occurs) of leakage selection (judgment and selection of leakage branch) is determined by detecting the zero-sequence voltage U 0 To achieve, that is, when the zero-sequence voltage is greater than the artificiall...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/32G01R31/02H02J13/00
CPCY02B90/20Y04S40/124
Inventor 赵建文
Owner XIAN UNIV OF SCI & TECH
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