Personal electric shock prevention control method of power distribution network with neutral point not connected with ground

A technology of ungrounded neutral point and control method, which is applied in the field of phase selection for single-phase ground faults of ungrounded neutral point distribution network, can solve the problems that the rapidity and accuracy requirements are difficult to achieve the expected effect at the same time, and achieve Quickly protect the person, meet the rapidity, and ensure the effect of reliability

Active Publication Date: 2018-05-01
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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AI Technical Summary

Problems solved by technology

Although these methods can judge the single-phase ground fault of the distribution network, it is difficult to achieve the expected results in terms of speed and accuracy.

Method used

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  • Personal electric shock prevention control method of power distribution network with neutral point not connected with ground
  • Personal electric shock prevention control method of power distribution network with neutral point not connected with ground
  • Personal electric shock prevention control method of power distribution network with neutral point not connected with ground

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as image 3 In the simulation model of the neutral point ungrounded distribution network shown, the anti-personal electric shock device is installed at the outlet of the 10kV busbar, and the original load of line 1 with a length of 10km is (0.5+j0.2)MVA, (0.3+j0. 1) The MVA heavy load is connected to the line in 0.3s and cut off in 0.4s.

[0033] At 0.5s, a fault occurs at f which is 7km away from the 10kV busbar (there are four possible faults), and the fault is removed in 0.6s. where single-phase (Phase A) When the human body gets an electric shock fault, the electric shock resistance of the human body is set to 1000Ω, and the sampling period is 0.1ms. When a two-phase short-circuit ground fault occurs, the transition resistance at the fault point is assumed to be 5Ω.

[0034] Such as figure 1 As shown, using the personal ...

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Abstract

The invention discloses a personal electric shock prevention control method of a power distribution network with a neutral point which is not connected with ground. The personal electric shock prevention control method comprises the steps of firstly, acquiring a three-phase voltage instantaneous value on a 10kV outgoing line at a substation; secondly, extracting a zero-sequence voltage by the three-phase voltage instantaneous value, and calculating three-phase voltage abruptly-changing quantity; thirdly, judging whether single-phase human body electric shock accident is generated or not according to an integral criterion combined by a zero-sequence voltage absolute value and the three-phase voltage abruptly-changing quantity, and controlling a circuit breaker to be closed; and finally, judging accident removal by the zero-sequence voltage, and controlling the circuit breaker to be disconnected. According to the method, single-end three-phase voltage information is employed, personal electric shock prevention rapid control of the power distribution network with the neutral point which is not connected with the ground is achieved, and the personal electric shock prevention control method has important significance to personal safety protection and normal power supply.

Description

technical field [0001] The invention relates to a phase selection method for a single-phase ground fault of a neutral point ungrounded distribution network, and in particular to a control method for preventing personal electric shocks in a neutral point ungrounded distribution network. Background technique [0002] Most of the 10kV medium-voltage distribution network in my country adopts the neutral point indirect grounding method, including neutral point non-grounding and arc-suppression coil grounding. In the neutral point ungrounded mode, when a single-phase ground fault or a two-phase short-circuit ground fault occurs, the short-circuit current flows into the ground through the fault point. In the personal electric shock accident in the distribution network, the possibility of single-phase electric shock is the greatest. At this time, the short-circuit current flows into the earth through the human body, which will cause serious harm to the electric shocker. Relevant st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/353G01R31/02G01R19/165
CPCG01R19/16547G01R31/50H02H3/353
Inventor 艾绍贵胡秀明黄永宁吴玫蓉郝治国徐靖东顾翼南
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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