Fault location system and method for small current grounding system based on zero-sequence transient analysis

A technology of small current grounding and transient analysis, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of attenuation of the injected signal strength and the failure of the fault indicator to collect the injected signal, etc., to achieve reliable judgment, The effect of reducing investigation time and accurately judging

Active Publication Date: 2019-08-16
四川瑞霆智汇科技有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no effect on large resistance and high resistance grounding. The reason is that the grounding resistance greatly attenuates the strength of the injection signal, which is already very weak, so that the fault indicator cannot collect the injection signal.
[0017] The neutral point compensates the grounded distribution network line through the arc suppression coil, and the arc suppression coil quickly compensates when a ground fault occurs, and the ground current of the fault line is quickly compensated after two or three cycles (see figure 1 , in the figure, the upper figure is the waveform of the faulty line, and the lower figure is the waveform of the normal line), causing the ground current to be less than 5A, making the above analysis methods invalid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fault location system and method for small current grounding system based on zero-sequence transient analysis
  • Fault location system and method for small current grounding system based on zero-sequence transient analysis
  • Fault location system and method for small current grounding system based on zero-sequence transient analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The present invention proposes a fault location system for small current grounding systems based on zero-sequence transient analysis, such as image 3 As shown, it includes a double-coil line fault indicator, a data concentrator and a background management platform. The double-coil line fault indicator is connected with the data concentrator through a ZigBee communication link, and the data concentrator is connected to the data concentrator through a communication network. The background management platform is connected; a double-coil line fault indicator is set on each phase line of the three-phase line, and the clocks of the double-coil line fault indicators on the three-phase line at the same monitoring point are synchronized;

[0079] The double-coil line fault indicator is set on the three-phase line trunk segment and the main branch node of the distribution network, and a double-coil line fault indicator is set on the three phase lines at each monitoring point , a...

Embodiment 2

[0096] This embodiment is further optimized on the basis of any of the above-mentioned embodiments, further to better realize the zero-sequence transient analysis-based small current grounding system fault location system of the present invention, such as image 3 As shown, the following setting method is specially adopted: the background management platform has built-in management software. When a single-phase ground fault occurs, the management software calls and measures the fault waveform data of 3 complete cycles from all concentrators according to the time when the fault occurs. The similarity and direction of the transient waveform of the zero-sequence circuit can judge the fault occurrence interval, and push the fault information and fault occurrence interval to the user terminal in time.

[0097] The management software is a management software with the functions of equipment management, communication management, data recall, and fault analysis;

[0098] The managemen...

Embodiment 3

[0105] At the same time, the present invention also proposes a fault location method for small current grounding systems based on zero-sequence transient analysis, combining figure 2 , image 3 As shown, use the clock synchronization technology to synchronize the clocks of the data concentrator and the double-coil line fault indicator, and perform data sampling through the double-coil line fault indicator. Analysis to determine whether it is a single-phase ground fault; when it is a single-phase ground fault, judge the occurrence time and interval of the single-phase ground fault, and notify the user terminal; the fault location method based on zero-sequence transient analysis of small current grounding systems Include the following specific steps:

[0106] 1) The data concentrator and the double-coil line fault indicator perform data handshake communication through ZigBee;

[0107] 2) Perform clock synchronization processing between the data concentrator and the double-coi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a zero-sequence-transient-analysis-based fault positioning system and method for a low current grounding system. The system comprises double-coil circuit fault indicators, a data concentrator and a backstage management platform. The double-coil circuit fault indicators are connected with the data concentrator by ZigBee communication links; and the data concentrator is connected with the backstage management platform by a communication network. One double-coil circuit fault indicator is arranged on each phase of line; and clocks of the double-coil circuit fault indicators on three-phase lines at the same monitoring point are synchronized. In addition, the method includes: the data concentrator and the double-coil circuit fault indicators carry out data hand-shaking communication; clock synchronization processing of the data concentrator and the double-coil circuit fault indicators is carried out; and zero sequence current synthesis and zero sequence transient waveform recording of all branch nodes of a distribution network are completed by using a clock synchronization technology, a micro power consumption wireless communication technology, and a zero sequence transient analysis technology and the data are sent to the backstage management platform to carry out fault point analyses and determination.

Description

technical field [0001] The invention relates to the technical field of electric power system intelligence, specifically, a fault location system and method for a small current grounding system based on zero-sequence transient analysis. Background technique [0002] The power system is a unified whole that converts primary energy into electrical energy, which is composed of equipment and technologies such as power generation, power transformation, power transmission, power distribution, power supply, and power consumption. After the electric energy is generated by the power plant, it is sent to the power user side through the high-voltage transmission network through the substations at all levels, and then supplied to the user through the distribution network. Generally speaking, the network with a voltage level above 110kV belongs to the transmission network, and the network with a voltage level of 6-66kV belongs to the distribution network. The distribution network is an i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 黄新宇邹家义徐立宪
Owner 四川瑞霆智汇科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap