Flexible limitation method of operating overvoltage for UHV AC transmission system

An ultra-high voltage AC, operating overvoltage technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of accelerated aging speed of arrester resistors and reduced reliability margins , limited use conditions, etc., to achieve the effect of improving the protection level, reducing the protection performance, and reducing the cost of transmission

Active Publication Date: 2019-05-21
CHINA ELECTRIC POWER RES INST +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the long-term operating charge rate of the arrester will increase from the current 0.77 to 0.83, so that the aging speed of the arrester resistance sheet under normal operation will be accelerated, and the reliability margin will be greatly reduced
Moreover, the prerequisite for using 762kV surge arresters must be to limit the power frequency overvoltage of the system to 1.2p.u. on the bus side and 1.3p.u. on the line side, and the use conditions are extremely limited.

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
  • Flexible limitation method of operating overvoltage for UHV AC transmission system
  • Flexible limitation method of operating overvoltage for UHV AC transmission system
  • Flexible limitation method of operating overvoltage for UHV AC transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0049] An embodiment of a method for flexible limitation of operating overvoltage for UHV AC power transmission systems provided by the present invention is as follows: figure 1 As shown, specifically:

[0050] Install a controllable arrester at the entrance of the substation line in the UHV AC transmission system, and determine the controllable ratio of the controllable arrester according to the length L of the substation line; judge whether to install a conventional arrester in the middle of the substation line according to the...

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 provides an operation overvoltage flexible limiting method for an EHV (extra-high voltage) AC power transmission system, and the method comprises the steps: installing a controllable lightning arrester at an entrance of a transformer substation line in the EHV AC power transmission system, and determining the controllable ratio of the controllable lightning arrester according to the length L of the transformer substation line; judging whether the central part of the transformer substation line is provided with a conventional lightning arrester or not according to the length L of the transformer substation line. Compared with the prior, the method can effectively reduce the overvoltage level of an EHV line, and especially reduces the operation overvoltage level of the central part of the line effectively.

Description

technical field [0001] The invention relates to an overvoltage limiting method, in particular to an operating overvoltage flexible limiting method for an UHV AC power transmission system. Background technique [0002] Starting from the ultra-high voltage (330kV ~ 750kV) power transmission system, the operating overvoltage has already played a controlling role in the insulation level of the power transmission and transformation equipment. The limit is getting lower and lower. In the UHV (1000kV) transmission system, the operating impulse discharge voltage of the air gap presents a saturation characteristic, and the operating overvoltage level has a greater impact on the cost and manufacturing difficulty of power transmission and transformation equipment. Therefore, it is necessary to deeply reduce the operating overvoltage multiple and select reasonably Equipment insulation level is very necessary. [0003] Surge arresters are the main devices for overvoltage protection in ...

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): H02H9/04
CPCH02H9/045
Inventor 陈秀娟陈维江时卫东贺子鸣韩彬殷禹
Owner CHINA ELECTRIC POWER RES INST
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