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Trip circuit of disconnector

A technology for tripping circuits and circuit breakers, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as unfavorable product standardization and serialization, and achieve the effect of standardization

Active Publication Date: 2015-04-29
DELIXI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the existing technology mainly adjusts the MCR protection setting value and the HSISC protection setting value of the circuit breaker by modifying the hardware circuit of the circuit breaker, which is not conducive to the standardization and serialization of products.

Method used

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  • Trip circuit of disconnector
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  • Trip circuit of disconnector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a tripping circuit for a circuit breaker, such as figure 1 As shown, it includes: a signal conversion unit 1, a fixed value setting output unit 2, a comparison unit 3 and a trip unit 4; wherein the signal conversion unit 1 is used to collect the current signal of each phase line in the grid line and convert the current signal Converted into the corresponding DC voltage signal and then output; the setting value setting output unit 2 is used to output the preset MCR protection setting value and the preset HSISC protection setting value at the moment of closing the circuit breaker; the comparison unit 3 is used to set the The DC voltage signal output by the signal conversion unit 1 is compared with the MCR protection setting and the HSISC protection setting, when the DC voltage signal is between the MCR protection setting and the HSISC protection setting output a first level (such as a low level), otherwise a second level (such as a high level) is ...

Embodiment 2

[0065] This embodiment provides a tripping circuit for a circuit breaker, such as image 3 As shown, in addition to including the signal conversion unit 1 described in Embodiment 1, the fixed value setting output unit 2, the comparison unit 3, and the trip unit 4, it also includes: a shutdown unit 5 connected between the comparison unit 3 and the trip unit 4. The trip unit 4 is configured to output the first level to the trip unit 4 when the MCR protection setting value or the HSISC protection setting value is higher than a preset voltage value.

[0066] Specifically, because the tripping unit 4 will only disconnect the circuit breaker when it receives the second level (that is, a high level), the circuit breaker is protected by MCR or HSISC, and the shutdown unit 5 is protected by MCR. When the fixed value or the HSISC protection fixed value is higher than the preset voltage value, only the first level (low level) can be output to the trip unit 4, and the trip unit 4 will not...

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Abstract

The invention provides a trip circuit of a disconnector. The trip circuit of the disconnector comprises a signal conversion unit, a constant value setting output unit, a comparison unit and a trip unit, wherein the signal conversion unit is used for collecting current signals of all phase lines in a power grid circuit, converting the current signals into corresponding direct current voltage signals and then outputting the direct current voltage signals; the constant value setting output unit is used for outputting a preset MCR protective constant value and a preset HSISC protective constant value at the moment of switching on of the disconnector; the comparison unit is used for comparing the direct current voltage signals output by the signal conversion unit with the preset MCR protective constant value and the preset HSISC protective constant value, a first electricity level is output when the direct current voltage signals are between the preset MCR protective constant value and the preset HSISC protective constant value, and otherwise a second electricity level is output; the trip unit is used for enabling the disconnector to be disconnected when the comparison unit outputs the second electricity level to realize the MCR protective function and the HSISC protective function of the disconnector, and standardization and serialization of disconnector products are realized.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a tripping circuit of a circuit breaker. Background technique [0002] Metallic short-circuit faults sometimes occur on the grid busbar or feeder. If the circuit breaker is turned on at this time, tens or hundreds of kiloamperes of current will flow through the circuit breaker. If the short-circuit current cannot be cut off in time and quickly, the circuit breaker is likely to fail Severely burned or destroyed, resulting in large-scale power outages or major property losses. [0003] The MCR (making current release) protection and HSISC (high setting instantaneous short circuit) protection of the circuit breaker are high-speed instantaneous protection for the circuit breaker itself. Make the circuit breaker body trip quickly to prevent the circuit breaker from being burned or damaged. [0004] When the MCR protection is in the closing operation, if the connected curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
Inventor 吴纪忠白建社
Owner DELIXI ELECTRIC