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Human body electrification protecting method and apparatus for small current system

A protection device and small current technology, which is applied in the direction of protection that responds to fault currents, can solve problems such as difficult extinguishing of arcs and inability to separate human bodies from electrified bodies, so as to improve power supply reliability, avoid system overvoltage damage, and reduce The effect of the probability of phase-to-phase short circuit

Active Publication Date: 2008-12-10
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that most of the personal electric shocks in the small current grounding system are single-phase electric shocks, and because the system voltage is high after the electric shock, the arc is not easy to extinguish, so that the human body cannot be separated from the charged body. The low-impedance repeated grounding, and the transfer of the human body grounding current, effectively protect the inductive personnel and effectively avoid the system overvoltage damage, and can protect the system equipment and faulty equipment. The small current system personal induction protection method and device

Method used

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  • Human body electrification protecting method and apparatus for small current system

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Embodiment 1

[0016] like figure 1 Shown, adopt microcomputer intelligent controller 1, said microcomputer intelligent controller 1 can be single-chip microcomputer, the voltage signal input terminal (U a , U b , U c , U L and U N ) is connected with the busbar 6 of the substation to collect the voltage of the busbar 6 of the substation in real time. The said microcomputer intelligent controller 1 judges whether the system has grounding and grounding phase difference according to the changes of the system line, phase and zero-sequence voltage. And after identifying the grounding phase, send a closing command to the phase-splitting circuit breaker 2 connected to the output terminal of the microcomputer intelligent controller 1 and corresponding to the grounding, and pass one end of the phase-splitting circuit breaker 2 through the isolating switch 5 and the substation bus 6 The other end of the split-phase circuit breaker 2 is connected to the grounding device 4. The grounding device 4 i...

Embodiment 2

[0018] As shown in the figure, the small current system personal induction protection device is composed of a microcomputer intelligent controller 1, a phase split circuit breaker 2 and a current transformer 3. The microcomputer intelligent controller 1 is provided with a three-phase voltage input terminal U a , U b , U c , system line voltage input terminal U L and zero-sequence voltage input terminal U N As well as the DC power input terminals +KM, -KM and +XM, -XM and the central alarm signal output terminal 7, the microcomputer intelligent controller 1 is powered by the DC power supply. The microcomputer intelligent controller 1 is used to identify the ground phase and issue a closing command to the phase-splitting circuit breaker 2 corresponding to the ground when a single-phase ground fault occurs in the system. The control terminal of the phase-splitting circuit breaker 2 is connected to the output terminal of the microcomputer intelligent controller 1. After the mic...

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Abstract

A personal induction protection method and device for a small current system, which uses a microcomputer intelligent controller to collect the bus voltage of a substation in real time, judges whether the system has grounding and grounding phase difference, and issues a closing command to the split phase corresponding to the grounding Circuit breaker, one end of the split-phase circuit breaker is connected to the busbar of the substation through the isolating switch, and the other end is connected to the grounding device. The device is connected in the control circuit, once a two-phase ground fault occurs, the personal induction protection device of the small current system will be withdrawn. Its device is composed of microcomputer intelligent controller, phase-splitting circuit breaker and current transformer. It prevents the device from malfunctioning, ensures that the phase-splitting circuit breaker realizes phase input, and prevents the line from tripping when successive ground faults of different phases occur in the system.

Description

technical field [0001] The invention is used in the technical field of preventing personal electric shock in a power system, and in particular relates to a method and device for personal electric shock protection in a small current system. Background technique [0002] In the power supply system, 10KV, 35KV, and 66KV power supply networks are generally used for medium and short distances, and the neutral point is not grounded or the operation mode is grounded through the arc suppression coil. When a single-phase ground fault occurs in this mode, the system protection does not work. Circuit breaker tripped. When personal induction occurs, it is generally a single-phase induction, and the system-to-ground capacitance current passes through the human body. Due to the high voltage, the arc cannot be extinguished, resulting in the inductive person being unable to separate from the live part. Due to the long-term effect of the current, generally Can cause fatal injury to electrif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/16
Inventor 张文会曹福林
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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