Dead-space free circuit breaker for earth leakage abrupt change and operation method thereof

Abstract

This invention relates to a drain abrupt without blind area breaker and its operation methods, which comprises single machine, zero current mutual inductance, drain signal amplifying circuit, power, drain electrical apparatus release and air breaker, wherein, the single machine operations are the following: first to initiate; second to measure the remain current range and phase angle; third to judge whether the remain current is more than the active value, and send out drain release order when it is; fourth to figure out the drain current; fifth to judge whether the drain current is more than active value, and send out drain release order when it is, wherein, this order activates the release operation to drive the air breaker to cur off fault circuit to get the drain abrupt without blind area protection.

Description

technical field [0001] The technical solution of the present invention relates to an automatic disconnection emergency protection circuit device that directly responds to unexpected changes from normal electrical working conditions, specifically a leakage mutation action non-dead zone circuit breaker and its operating method . Background technique [0002] Leakage protection technology is widely used in low-voltage power grids to prevent leakage fires and protect people from electric shock. The current leakage protection technology used in leakage circuit breakers is the residual current action protection technology. In the three-phase power grid, due to the phase angle difference of the leakage current of each phase, the phase of the final residual current is an arbitrary value. When there is equipment leakage or someone gets an electric shock, the leakage or electric shock current and the inherent residual current in the grid It may be the opposite, causing the residual ...

AI Technical Summary

Problems solved by technology

In the three-phase power grid, due to the phase angle difference of the leakage current of each phase, the phase of the final residual current is an arbitrary value. When there is equipment leakage or someone gets an electric shock, the leakage or electric shock current and the inherent residual current in the grid It may be the opposite, causing the residual current not to increase, but to decrease. At this time, the leakage protector should act but cannot act, and the dead zone of leakage protection will appear, so that leakage loss and electric shock casualty accidents will be caused.

[0003] In CN 85205360 "phase-sensitive rectification type pulse current type protector", CN 95217004.3 "phase-detection-amplitude silent operation leakage protector", CN 96250129.8 "phase-detection-amplitude pulse-type leakage protector", CN 99251608.0 "phase-detection-amplitude Electric shock leakage action relay", CN 01228575.7 "leakage protector with two adjustment devices of slow change and sudden change" and CN 02280316.5 "phase and amplitude leakage comprehensive protector", disclosed the separate protection methods for leakage and electric shock, In CN 98118285.2, CN 98245498.8 "Microcomputer Digitalized Intelligent Leakage Protector" and CN 98217990.1 "Microcomputer Phase and Amplitude Leakage Protector", the technology of using microcomputer to carry out phase and amplitude leakage protection is disclosed, which solves the problem of discrete components affected by temperature. The dead zone of electric shock action caused by parameter changes caused by other influences, but only protects the electric shock that occurs on the phase line or has no phase difference with the phase line

In short, the above-mentioned disclosed technologies still cannot provide effective protection for equipment leakage and people contacting charged capacitive or inductive equipment for electric shock, that is, there are still dead zones in equipment leakage protection and human electric shock protection.

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