Override trip protection system and method for coal mine power network

A technology of leapfrog tripping and protection system, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., to achieve the effect of real-time monitoring and timely processing

Inactive Publication Date: 2013-05-01
SHANGHAI SHANYUAN ELECTRONICS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings existing in the prior art, the present invention provides a leapfrog trip protection system and method for coal mine power grids, which solves the occurrence of leapfrog trips caused by the failure of quick-break protection and overcurrent protection

Method used

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  • Override trip protection system and method for coal mine power network
  • Override trip protection system and method for coal mine power network
  • Override trip protection system and method for coal mine power network

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] figure 1 It is the schematic diagram of cascaded longitudinal differential protection.

[0024] like figure 1 As shown, 5DL, 6DL, 7DL, and 8DL are cascaded switches, the main protection is 0-second cascaded longitudinal differential protection, and the backup protection is over-current protection with time limit. The delay time of over-current protection can be set as follows: 5DL-0.5S; 6DL, 7DL-0.35S; 8DL-0.2S. The rest of the switch main protection with load is 0-second short-circuit protection and overload protection with time limit.

[0025] When the cascade line is faulty: when the cascade line between 7DL and 8DL is short-circuited, 5DL, 6DL, and 7DL all feel the short-circuit current, and the rest of the switches have no short-circuit current; the difference current between 5DL and 6DL is 0, and the level The vertical differe...

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Abstract

The invention discloses an override trip protection system and method for a coal mine power network. The override trip protection system comprise a ground power substation, a center power substation, a mining area power substation and switches, and is characterized in that a first switch and a second switch are cascaded between the ground power substation and the center power substation, a third switch and a fourth switch are cascaded between the center power substation and the mining area power substation, and the switches are respectively connected with a longitudinal differential protector.

Description

technical field [0001] The invention relates to a safety protection device for a coal mine power grid, in particular to a leapfrog tripping protection system and method for a coal mine power grid. Background technique [0002] The relay protection in the power system usually adopts the principle of three-stage current protection. The three-stage current protection generally consists of no time-limited current quick-break protection (I section), time-limited current quick-break protection (II section) and definite time over-current protection (III section). ) cooperate with each other to form a complete set of protection. Among them, section I and section II are jointly used as the main protection of the line, and section III is used as the near backup of the line and the far backup protection of the adjacent line. [0003] According to the three-stage protection theory, the quick-break protection can only protect 80% of the total length of the line, and the overcurrent prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H7/26H02H3/26
Inventor 卜海滨付志勇
Owner SHANGHAI SHANYUAN ELECTRONICS SCI & TECH CO LTD
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