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A method and device for detecting the fault direction of single-phase disconnection of 10kv distribution line based on phase voltage change information

A technology for distribution line and disconnection faults, which is applied in the direction of measuring devices, fault locations, and measuring electrical variables, etc., can solve problems such as difficult diagnosis of single-phase disconnection, and achieve the effect of wide application range and strong practicability

Active Publication Date: 2022-07-29
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

It is used to overcome the problem that the existing power distribution protection device is difficult to diagnose single-phase disconnection faults

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  • A method and device for detecting the fault direction of single-phase disconnection of 10kv distribution line based on phase voltage change information
  • A method and device for detecting the fault direction of single-phase disconnection of 10kv distribution line based on phase voltage change information
  • A method and device for detecting the fault direction of single-phase disconnection of 10kv distribution line based on phase voltage change information

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specific Embodiment

[0055] Specific examples: Figures 1 to 4 It is an example accompanying drawing of the present invention, and the following is in conjunction with the accompanying drawings. Figures 1 to 4 The present invention is further described:

[0056] figure 2 Shown is a 10kV power distribution and a corresponding distribution transformer terminal system matching the present invention. The system includes three parts: a distribution transformer terminal detection device located at the detection point, a master station, and a communication system. The detection device communicates with the master station. The system contacts, the distribution transformer terminal determines the fault direction and selects the phase of the fault, and further sends the fault information to the master station for processing, and the master station realizes the precise location of the fault. Switches K1 and K2 control the neutral point grounding method of the system. There are 6 outgoing lines in the sy...

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Abstract

The invention discloses a method and device for detecting the fault direction of a single-phase disconnection of a 10kV distribution line based on phase voltage change information. The terminal platform records the amplitude and relative phase of the phase voltage at the detection point of the line in real time, and further compares and calculates the data of the detection point at two adjacent moments to determine whether the calculated value meets the criterion range proposed in this patent, so as to Determine whether the breakpoint is upstream or downstream of the detection point. The invention is a supplement to the ground fault detection means of the existing power distribution system, and can realize the precise location of the fault by cooperating with the mutual communication between multiple detection points. Strong practicality.

Description

technical field [0001] The invention belongs to the technical field of power distribution network relay protection. In particular, it relates to a method for detecting the direction of a single-phase disconnection fault in a 10kV distribution line based on phase voltage variation information. Background technique [0002] With the application of insulated conductors, disconnection faults in distribution networks tend to occur frequently. However, the existing disconnection fault detection methods are limited, and it is difficult to realize the timely diagnosis of the fault, and it is difficult to remove the faulty line in time, resulting in a certain fire risk. [0003] After the single-phase disconnection fault occurs, when the conductors on both sides of the fracture are dropped to the ground, the voltage steady state characteristics are similar to those of the single-phase grounding fault. Therefore, the traditional small-current grounding fault diagnosis method can also...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 杨程周斌郑海涯金贵红封杰周立波吴育腾周之华王秀境钱程薛永瑞谢松伟陈梦琦
Owner GUIZHOU POWER GRID CO LTD
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