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Override trip prevention control system

A control system and anti-override technology, applied in electrical components, emergency protection circuit devices, etc., can solve problems such as overstep tripping, and achieve safe operation, alleviating the interaction between the main switch and the opening of the line, and good protection. Effect

Inactive Publication Date: 2020-03-17
SHANGHAI YI KUN AUTOMATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a control system for preventing over-level tripping, which can effectively solve the problem of frequent over-level tripping in coal mines

Method used

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  • Override trip prevention control system

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Experimental program
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Effect test

Embodiment 1

[0050] In the specific design, a short circuit of a fourth-level power supply circuit causes the switch of this circuit to trip. At this time, the signal of the fourth-level AD converter is fed back to the third-level control unit. If the current data of the third-level power supply circuit is normal at this time, the third-level control unit will not be disconnected. Three-level switch; if the current data of the three-level power supply circuit is too large at this time, the three-level control three-way control three-level relay disconnects the three-level switch, and feeds back the signal to the second-level control unit.

[0051] The delayed trip time for tertiary control units is calculated by the following procedure:

[0052] Ts=(n-m)×T+Td

[0053] Among them, Ts is the time when the switch action command is issued, the "waiting delay" T of the machine is 2s, the short circuit detection + communication completion time Td of the machine is 5s, m is 3, and n is 4.

[005...

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Abstract

The invention relates to the field of circuit protection, in particular to a circuit protection device. An override trip prevention control system comprises a first-stage power supply circuit, a first-stage control circuit and a second-stage control circuit; the first-stage control circuit comprises a first-stage current transformer, a first-stage AD converter, a first-stage control unit and a first-stage relay which are connected in sequence, and the first-stage relay is connected with the control end of a first-stage switch. Thorugh multi-stage switch control, the problem of mutual influenceamong all stages of switches can be effectively relieved; by adopting the time delay circuit, the switch tripping time of each circuit can be effectively controlled, large-area power failure caused by individual circuit problems is avoided, safe operation of an underground power supply system is powerfully guaranteed by relieving override tripping conditions, faulty circuits are screened in time,and troubleshooting is facilitated.

Description

technical field [0001] The invention relates to the field of circuit protection, in particular to a circuit protection device. Background technique [0002] At present, the substations of the coal mine underground power supply system in my country mostly adopt the vertical power supply mode, so there is a high probability of large-scale blackouts in the power system at all levels, and the power supply system trips in the coal mine underground due to insufficient circuit protection measures Many, at the same time, the complex connection mode between various substations cannot accurately judge the fault, which has caused a great impact on production and manufacturing. [0003] In recent years, more and more circuit protection methods have been continuously applied to all walks of life to effectively ensure the normal operation of power equipment, not only with remarkable results, but also to provide a guarantee for the company's resource security. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 骆弟华吕玉奇
Owner SHANGHAI YI KUN AUTOMATION EQUIP