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Power distribution network single-phase earth fault sensing method based on transient state and steady state of phase current

A single-phase ground fault, distribution network technology, applied in the fault location, fault detection by conductor type, short-circuit test, etc., can solve the problem of complex fault conditions in the distribution network, reduce secondary cable laying, and locate accuracy. High, reliability-enhancing effect

Active Publication Date: 2021-08-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, this application provides a single-phase ground fault sensing method in distribution network based on phase current transient steady state, and detects single-phase ground fault in distribution network based on asymmetric signal between transient state and steady state. Sensing can solve the problem of complex fault conditions in the distribution network, meet the fault location requirements of multiple fault types and different neutral point grounding methods, and use the adaptive threshold to meet the requirements of high adaptability and weak dependence on communication

Method used

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  • Power distribution network single-phase earth fault sensing method based on transient state and steady state of phase current
  • Power distribution network single-phase earth fault sensing method based on transient state and steady state of phase current
  • Power distribution network single-phase earth fault sensing method based on transient state and steady state of phase current

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Embodiment 1

[0170] like Image 6 as shown, Image 6 It is the structural diagram of the simulation model of the neutral point grounding system through the arc suppression coil on the physical simulation platform.

[0171] Image 6 Lines 1 and 3 are normal lines, and line 2 is a faulty line. Install detection devices at the head ends of lines 1 and 3 respectively. Line 2 is divided into two sections, front and rear, respectively.

[0172] According to the present invention, a physical simulation platform is used to simulate high-resistance grounding and arc grounding to perform fault sensing technology simulation verification, wherein high-resistance grounding is a special case of resistance grounding, and it is a case where line selection is difficult.

[0173]For the single-phase ground fault of the neutral point through the arc suppressing coil grounding system or the neutral point ungrounded system, a single-phase ground fault sensing method of the distribution network based on the p...

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Abstract

The invention discloses a power distribution network single-phase earth fault sensing method based on a transient state and a steady state of a phase current. The method comprises the steps: collecting the three-phase current of a power distribution network, synthesizing a zero-sequence current, calculating the amplitude of a fundamental wave, and obtaining a fault signal when a single-phase earth fault occurs, thereby obtaining a fault occurrence moment and a line fault component current; solving the fundamental component amplitude and the high-frequency component amplitude of the fault component current, and judging whether the quantitative relation between the fundamental component amplitude and the high-frequency component amplitude meets the fault sensing criterion or not; when the criterion is met, judging that the system has the grounding fault through the resistor, and obtaining a fault path positioning result by combining the steady-state characteristic of the fault component current with the variance; otherwise, judging that the system has an arc earth fault, and obtaining a sampling point at the fault occurrence moment and a three-phase current abrupt change direction by combining the transient characteristics of the fault component current with improved S transformation to obtain a fault path positioning result. The method is suitable for various single-phase earth fault types occurring in the power distribution network, and the operation reliability of the power distribution network is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electric power automation, and relates to a single-phase ground fault sensing method of a distribution network based on phase current transient steady state. Background technique [0002] As a bridge connecting the power system and users, the reliability of distribution network determines the quality and safety of power users. With the continuous progress of the economy and society, the distribution network presents a development trend of expanding scale and complex topological structure. The problem of single-phase ground fault in distribution network also has the characteristics of unclear fault characteristics and various fault situations. Single-phase ground fault The positioning problem has not been well solved and cannot meet the requirements of its economical and reliable operation. [0003] At present, the fault location technology of distribution network can be roughly divided into two types bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/52
Inventor 齐郑赵昕一
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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