Route selection method aiming at electric arc ground fault

A wire selection method and arc grounding technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of complicated calculation, long calculation time, inappropriate wire selection device, etc., and achieve high wire selection accuracy and low cost. , Effective effect of arc ground fault

Inactive Publication Date: 2010-12-22
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the complex calculation and long calculation time, it is not suitable for developing line selection devices with single-chip microcomputers.

Method used

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  • Route selection method aiming at electric arc ground fault
  • Route selection method aiming at electric arc ground fault
  • Route selection method aiming at electric arc ground fault

Examples

Experimental program
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Effect test

Embodiment Construction

[0014] In order to achieve the above object, the present invention is achieved by taking the following technical solutions:

[0015] A new line selection method especially for arc ground faults, which is suitable for various neutral point non-effectively grounded grids, including:

[0016] ①Sampling the zero-sequence voltage, calculating and judging whether the zero-sequence voltage exceeds the set threshold value, if it exceeds, it means that there is a single-phase ground fault in the power grid, and then proceed to the following 5-step line selection judgment.

[0017] ②Sampling the zero-sequence current of each feeder synchronously, and sampling the zero-sequence current of each feeder i 0j (k) Perform 50Hz fundamental notch wave processing to obtain zero-sequence transient current sampling values ​​of each feeder (k).

[0018] ③ It is known from literature [1] that the zero-sequence transient current of the faulted feeder is the sum of the zero-sequence transient curre...

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Abstract

A wire selection method for arcing ground failure uses zero sequence voltage amplitude as a selection-judged starting signal. After the zero sequence voltage amplitude is more than a threshold value, a zero sequence voltage of each feeding wire being sampled, then 50Hz fundamental wave treatment is implemented to the sampling signals to obtain zero sequence transient state currents, further five to six feeding wires with maximum amplitude of zero sequence transient state current are selected as ''doubtful true'' failure feeding wires, from which a feeding wire with maximum amplitude is selected as a quantity ib(k) of standard feeding wire, and the ib(k) is multiplied with the zero sequence transient state currents of the other ''doubtful true'' feeding wires point by point separately, andan algebraic average of a period of time is calculated as failure predication quantity Wj. If only one Wj of the all Wj is negative, the corresponding feeding wire is the failure feeding wire; if allWj are negative, the standard feeding wire is the failure feeding wire; if all Wj are positive, the busbar is fault.

Description

technical field [0001] The invention relates to a small-current grounding line selection method for a power grid substation, which is suitable for any neutral-point grounded power grid and is particularly effective for arc grounding faults. The utility model belongs to the technical field of electric power automation. Background technique [0002] Both the experiment and the recorded wave data of the field grid prove that due to the complexity of single-phase ground faults, when some single-phase ground faults occur, there is only a steady state in the zero-sequence current of the feeder; some single-phase ground faults only have a transient state; Sometimes both. The laboratory physical simulation test also proves that under quite a lot of arc grounding conditions, the steady-state current in the fault current is very small or almost zero, while the transient current is very high, resulting in unsatisfactory line selection effects. The chances of rejection are high. Fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 唐轶陈庆陈奎
Owner CHINA UNIV OF MINING & TECH
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