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Distribution network electric shock protection method and device

A technology for electric shock protection and distribution network, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., to reduce the degree of injury and protect life safety

Inactive Publication Date: 2012-08-22
NINGXIA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obvious disadvantage of this method is that once the operator touches the electrified body, he will inevitably be shocked by the electric shock and cause serious consequences.

Method used

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  • Distribution network electric shock protection method and device
  • Distribution network electric shock protection method and device
  • Distribution network electric shock protection method and device

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Experimental program
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Embodiment Construction

[0015] A method for electric shock protection of a distribution network, comprising the following steps: when someone gets an electric shock and causes the voltage of a corresponding electric-shocked phase bus in the distribution network to decrease and the voltage of other two-phase buses to After analyzing the secondary signal and judging that the phase has an electric shock to the human body, close the circuit breaker connected in series between the bus bar and the ground wire to short-circuit the bus bar to ground. The delay time t (the length of t is 10s by default, and can be artificially After setting), the aforementioned circuit breaker is automatically disconnected to restore the voltage of the electric shock phase.

[0016] Such as figure 1 As shown, a distribution network electric shock protection device includes a three-phase voltage transformer (PT), the input terminal (primary winding) of the three-phase voltage transformer (PT) is connected to each phase bus of ...

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Abstract

The invention relates to a distribution network electric shock protection method and device. The method is characterized by comprising the following steps: when an electric shock of a human body causes the decrease of bus voltage of a corresponding electric shock phase of the distribution network and the increase of bus voltages of the other two phases, after the controller analyzes the secondary signal of a three-phase potential transformer (PT) connected with the three-phase buses and judges that an electric shock of the human body occurs at the phase, a circuit breaker connected between the phase bus and a ground wire in series is closed, thereby short-circuiting and grounding the bus; and after the delay time is due, the circuit breaker is automatically opened, thereby recovering the voltage of the electric shock phase. The invention can provide effective protection when a person has already contacted an electrified body, thereby effectively reducing the injury degree of the electrically shocked person.

Description

technical field [0001] The invention relates to an electric shock protection method and device for a distribution network. Background technique [0002] Electric shock accident is a common and extremely harmful safety accident. Electric shock may not only cause casualties, but also cause fires, large-scale power outages and other consequences, which seriously affect social production and life. From production to consumption, electric energy generally includes four links: power generation, power transmission, accompanying power and power consumption. The voltage levels and wiring methods used in different links are different. Among them, power generation and distribution and large-scale power users mostly adopt 6-10kV neutral point ungrounded system, and power transmission mostly adopts neutral point directly grounded system with voltage level of 110kV and above, while ordinary residential electricity or small power users mostly use single-phase 220V, three-phase 380V low-v...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H3/22
Inventor 艾绍贵樊益平马奎吴旭涛车俊禄王博丁培蔡杰朱文炜张国勇
Owner NINGXIA ELECTRIC POWER RES INST