Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ultralow frequency partial discharge detection-based evaluation method and system

A partial discharge detection and evaluation system technology, applied in the direction of testing dielectric strength, fault location, etc., to ensure safe and reliable operation and reduce cable faults

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +1
View PDF3 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide an evaluation method and system based on ultra-low frequency partial discharge detection, aiming to solve the problem of lack of methods for evaluating the insulation performance of power cables

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
  • Ultralow frequency partial discharge detection-based evaluation method and system
  • Ultralow frequency partial discharge detection-based evaluation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] like figure 1 As shown, the evaluation method based on ultra-low frequency partial discharge detection in the embodiment of the present invention includes the following steps:

[0024] S101: According to the new laying or operation of the cable line, for the power cable suspected of having insulation defects, in combination with the test arrangement before putting into operation or the power outage maintenance plan for the connected electrical equipment, ...

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 an ultralow frequency partial discharge detection-based evaluation method and an ultralow frequency partial discharge detection-based evaluation system. The method comprises the following steps: determining a power cable on which insulation performance evaluation is required to be performed according to the new laying or operation condition of a cable line; disconnecting the section of cable line with electric equipment at the two ends and taking a safety measure; performing ultralow frequency partial discharge detection on the cable line through an ultralow frequency cable partial discharge diagnosis and positioning system; performing symmetrical analysis on a partial discharge detection result by comparing the laying conditions at a cable path and a middle joint position so as to make effective evaluation on the insulation performance of the cable line. The system comprises a testing power supply, a filter, a coupling capacitor, an impedance detector and a partial discharge detector. According to the method and the system, by performing ultralow frequency partial discharge actual measurement on the cable, the mounting quality of the cable is effectively discovered, and the insulation situation of the cable is learnt, the faults of the cable are reduced, the hidden faults of the cable line can be timely discovered, and the method and system have great significance to safe and reliable operation of a power grid.

Description

technical field [0001] The invention belongs to the technical field of power cable maintenance, and in particular relates to an evaluation method and system based on ultra-low frequency partial discharge detection. Background technique [0002] Since power cables are widely used in urban power grids, the failure rate of cables directly affects the power supply reliability of the power grid. As time goes by, the insulation aging of cables will further intensify, and the resulting grid faults will become more frequent, which will seriously Threat to the safe operation of the power grid. [0003] Long-term practice has proved that partial discharge is the main cause of power cable insulation damage. Therefore, evaluating the insulation performance of power cables through effective evaluation methods and timely discovering hidden faults are important means to ensure their reliable operation. [0004] There is a lack of methods to evaluate the insulation performance of power cab...

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 Applications(China)
IPC IPC(8): G01R31/12G01R31/08
Inventor 唐庆华刘继平项添春郗晓光李雪陈荣严玮
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products