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Single-phase ground fault section positioning method for low-current grounding system

A single-phase grounding fault, small current grounding technology, applied in the fault location and other directions, can solve the problem of low detection accuracy, and achieve the effect of high detection accuracy

Inactive Publication Date: 2012-11-07
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen that in the prior art, there is no method for determining the specific location of the single-phase ground fault point on the branch line in the small current grounding system, and the detection accuracy is low

Method used

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  • Single-phase ground fault section positioning method for low-current grounding system
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  • Single-phase ground fault section positioning method for low-current grounding system

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Embodiment

[0066] Figure 5 It is the overhead line transmission model of the small current grounding system described in the embodiment of the present invention. Such as Figure 5 As shown, four detection devices A, B, C, and D are installed along a feeder line, assuming that the single-phase ground fault occurs in the BC section.

[0067] In this embodiment, the line parameters are: positive sequence impedance Z 1 =0.17+j0.38Ω / km, positive sequence ground admittance b 1 =j3.045us / km, zero sequence impedance Z 0 =0.23+j1.72Ω / km, zero sequence ground admittance b 0 = j1.884us / km, l 1 = 20km, l 2 = 15km, l 3 = 24km, l 4 = 8km, l 5 = 16km, l 6 = 30km. The parameters of the transformer are: Δ / Y connection, the primary side voltage is 220KV, the secondary side voltage is 35KV, and the leakage impedance of the primary winding is Z 1δ =0.4+j12.2Ω, the leakage impedance of the secondary winding is Z 2δ =0.006+j0.183Ω, the steady-state excitation current is 0.672A, the main magnetic...

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Abstract

The invention provides a single-phase ground fault section positioning method for a low-current grounding system. The single-phase ground fault section positioning method for the low-current grounding system includes when a single-phase ground fault of the low-current grounding system occurs, recording zero modal current signals in cycles before and after the fault time to obtain zero modal current pure fault component signals; subjecting transient zero modal current pure fault components measured by detectors or automatic feeder terminals on a whole feeder to S-transformation; obtaining transient zero modal current energies of the detectors or automatic feeder terminals at all frequency points, and obtaining sum of transient energies of the frequency points in a frequency of a feeder system; obtaining relative energy entropies of the detectors or automatic feeder terminals; subjecting the relative energy entropies of any two adjacent detectors or automatic feeder terminals to multiple combinations, comparing the combination results, and determining a possible fault section occurring most frequently as a fault section. The single-phase ground fault section positioning method for the low-current grounding system has the advantages of high detection precision and high universality and is widely applicable to power systems.

Description

technical field [0001] The invention relates to a distribution network fault diagnosis technology, in particular to a method for locating a single-phase ground fault section of a small current ground system. Background technique [0002] In recent years, the research work on fault location of high-voltage transmission lines has made great progress. The distance measurement device has been developed and has been popularized and used in the national power grid, and good results have been achieved. However, compared with the high-voltage transmission network, the low-current grounding system has more branch lines, complex network topology, and is easily affected by transition resistance, etc., and the transmission distance of the small-current grounding system is relatively short, so it is still impossible to achieve high-precision fault location . [0003] At present, the application number 200910094432.2 is in the Chinese patent application titled "Distribution Network Fault...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王晓卫张玉均朱贞卫张涛杨晓邦田书李玉东封海潮高杰余建芮魏向向
Owner HENAN POLYTECHNIC UNIV
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