Override trip prevention protection method and device

A tripping protection and leapfrog tripping technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve hidden dangers in power distribution systems, leapfrog tripping, and it is difficult to achieve step-by-step detection of power distribution circuits, etc. problems, to achieve the effect of improving safety and reliability, ensuring safety, and avoiding skipping trip accidents

Pending Publication Date: 2020-08-18
天津市中力神盾电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-overstepping tripping method proposed in the patent needs to detect whether there is a short-circuit fault in each stage of the circuit before starting the overstepping tripping protection system. Level detects whether there is a fault in the power distribution circuit and then restarts the protection, which is likely to cause leapfrog tripping, which brings great hidden dangers to the power distribution system

Method used

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  • Override trip prevention protection method and device
  • Override trip prevention protection method and device
  • Override trip prevention protection method and device

Examples

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Embodiment 1

[0030] figure 1 It is a flow chart of the method for preventing over-level tripping protection provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method for preventing over-level trip protection provided by the embodiment of the present invention is used for over-level trip protection of multi-level power distribution circuits, including the following steps:

[0031] S101, when it is detected that the current in the final power distribution circuit exceeds the set instantaneous current, instruct the circuit breaker in the final power distribution circuit to trip;

[0032] S102, after waiting for the set interval time T, the upper-level power distribution circuit continues to detect the current in the distribution circuit, and when it detects that the current in the own-level circuit exceeds the set instantaneous current, instruct the current-level circuit breaker to trip .

[0033] In the low-voltage power distribution system of this embodimen...

Embodiment 2

[0038] image 3 It is a flow chart of the method for preventing over-level tripping provided by Embodiment 2 of the present invention. Such as image 3 As shown, the method for preventing over-level trip protection provided by the embodiment of the present invention is used for over-level trip protection of multi-level power distribution circuits, including the following steps:

[0039] S201, when it is detected that the current in the final power distribution circuit exceeds the set instantaneous current, instruct the circuit breaker in the final power distribution circuit to trip;

[0040] S202, after waiting for the set interval time T, the upper-level power distribution circuit continues to detect the current in the power distribution circuit, and when it detects that the current in the own-level circuit exceeds the set instantaneous current, instruct the current-level circuit breaker to trip ;

[0041]S203, when tripping in the final power distribution circuit, it also...

Embodiment 3

[0047] This embodiment provides an anti-override trip protection device, which includes:

[0048] The first tripping module 301, the first tripping module 301 is used to instruct the circuit breaker to trip when it is detected that the current in the final power distribution circuit exceeds the set instantaneous current;

[0049] The second trip module 302, the second trip module 302 is used to detect the current in the upper power distribution circuit, when it is detected that the current in the upper power distribution circuit exceeds the set instantaneous current, wait for the set interval After time T, instruct the circuit breaker at the same level to trip;

[0050] A time recording module 303, the time recording module 303 is used to record the trip time T0 in the final power distribution circuit when tripping is performed in the final power distribution circuit, and the trip time T0 needs to be less than 200ms, that is, T0<200ms; and The sum of the tripping time T0 and ...

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Abstract

The invention provides an override trip prevention protection method and device, and the method comprises the following steps: indicating a circuit breaker in a final-stage power distribution loop totrip when the current in the final-stage power distribution loop is detected to exceed a set instantaneous current; and meanwhile, after waiting for the set interval time T, enabling the superior power distribution loop to continue to detect the current in the power distribution loop where the superior power distribution loop is located, and when it is detected that the current in the superior power distribution loop exceeds the set instantaneous current, enabling the superior power distribution loop to instruct the circuit breaker to trip. According to the invention, when the last-stage powerdistribution loop detects the instantaneous current, the instantaneous current can be detected; the total time required by the first tripping of the power distribution loop is recorded, the time is delayed step by step to cut off the power distribution loop, and the protection selectivity is ensured through the cooperation of the tripping time difference of the upper and lower stages of power distribution loops, thereby achieving the step-by-step protection of the power distribution loop, and avoiding the override tripping accident.

Description

technical field [0001] The invention belongs to the technical field of electric power protection, and in particular relates to a protection method and device for preventing over-level tripping. Background technique [0002] In my country's power supply system, the low-voltage distribution system reduces the transmission voltage of the grid to the distribution voltage, and then transmits it to the low-voltage distribution equipment through the distribution line. The current low-voltage distribution lines often cause voltage loss, overvoltage, overload and short-circuit due to the large load, and because the distribution line is short and has many extension stages, it will also cause the distribution line to trip over the level. Great pressure is placed on the power distribution system, so methods and systems for "anti-overtrip tripping" are required to protect the power distribution lines and the power distribution system. [0003] The current patent "A method and device for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/093
CPCH02H7/262H02H3/093
Inventor 孙巍巍
Owner 天津市中力神盾电子科技有限公司
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