High-voltage cable protector fault on-line detection method based on sheath current angle difference

A sheath current, high-voltage cable technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of epoxy board breakdown, sheath damage, manual inspection of sheath protectors, etc., to improve efficiency. Effect

Pending Publication Date: 2022-07-29
HUBEI UNIV OF TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the existing cable fault detection methods are mainly aimed at faults such as epoxy board breakdown, water ingress in the grounding box, and damage to the sheath. The fault of the sheath protector still relies on manual inspection.
Moreover, most of the current detection methods use the sheath current amplitude, the relative value of the sheath current and the ratio of the sheath current to the load current to diagnose the fault of the cable grounding system. In some cases, these diagnostic criteria cannot be used as the The only basis for fault diagnosis, it is also necessary to use the sheath current phase angle to improve the accuracy of fault diagnosis

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
  • High-voltage cable protector fault on-line detection method based on sheath current angle difference
  • High-voltage cable protector fault on-line detection method based on sheath current angle difference
  • High-voltage cable protector fault on-line detection method based on sheath current angle difference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0079] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0080] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

[0081] The present invention will be further described below in conjunction with specific embodiments, but not as a limitation of the present invention.

[0082] In this embodiment, an equivalent model of a three-phase nine-section cross-connected high-voltage cable is established, and the curren...

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 relates to a high-voltage line fault detection technology, in particular to a high-voltage cable protector fault on-line detection method based on a sheath current angle difference, which comprises the following steps: establishing a three-phase nine-section crossed and interconnected high-voltage cable equivalent model; current sensors installed at the head end and the tail end of the crossed interconnection cable line are used for measuring sheath current; establishing a transfer function of fault impedance and sheath current difference of the sheath protector; and performing fault diagnosis on the sheath protector by taking the current difference phase angle as a characteristic quantity. And in the process of formulating the diagnosis criterion, the influence of the size of the cable core current, the working voltage fluctuation, the ground impedance, the length of a small section of cable and the fault degree of the sheath protector on the sheath current is considered. According to the detection method, the maintenance efficiency and the fault diagnosis accuracy of the sheath protector at the present stage are improved.

Description

technical field [0001] The invention belongs to the technical field of high-voltage line fault detection, and particularly relates to an on-line fault detection method for a high-voltage cable protector based on a current angle difference of a sheath. Background technique [0002] At present, the existing cable fault detection methods are mainly aimed at faults such as epoxy board breakdown, grounding box water ingress, and sheath damage. The fault of the sheath protector still relies on manual inspection. In addition, most of the current detection methods use sheath current amplitude, sheath current relative value and sheath current to load current ratio for fault diagnosis of cable grounding system. In some cases, these diagnostic criteria cannot be used as sheath protectors. The only basis for fault diagnosis is to use the sheath current phase angle to improve the accuracy of fault diagnosis. SUMMARY OF THE INVENTION [0003] In view of the problems existing in the bac...

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): G01R31/00
CPCG01R31/00
Inventor 王航刘福源夏湛然杨斌郭浩然张亮涂京高新昀
Owner HUBEI UNIV OF TECH
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