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Externally gapped line arrester

A line surge arrester and gap technology, applied in the direction of spark gap overvoltage arresters, circuits, resistors, etc., can solve the problem that it is difficult to realize the proper design of EGLA series gap

Active Publication Date: 2021-05-11
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Proper design of the EGLA series gap is difficult to achieve due to the contradictory criteria of having to spark for lightning but not for switching strikes
The difficulty of achieving a proper design increases with the transmission voltage

Method used

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  • Externally gapped line arrester
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  • Externally gapped line arrester

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Embodiment Construction

[0028] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of illustration so that this disclosure will be thorough and complete, and will The scope of the present invention is fully conveyed to those skilled in the art. Throughout the specification, the same reference numerals denote the same elements.

[0029] The physical air gap spacing or strike distance between the electrodes in an external gap line arrester (EGLA) defines in part the critical flashover voltage (CFO) for a given impulse. Furthermore, the shape or form of the gap electrode also plays a role, and this defines the so-called "gap factor", which has an effect on the probability of flashover for a given surge or ...

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Abstract

Embodiments presented herein relates to an externally gapped line arrester, EGLA, for transmission lines. The EGLA comprising a series varistor unit, SVU, (1) having a first end and a second end, the SVU configured to be connected between a transmission line and ground, a primary sparkover gap unit (8) serially connected to the first end of the SVU, a secondary gap arranged between the second end of the SVU and ground, and the secondary gap serially connected to the second end of the SVU, a shorting-link device (3) connected in parallel with the secondary gap, and a disconnecting device (4) arranged in the shorting-link device, the disconnecting device configured to open the shorting-link device when the SVU is overloaded. A method for impulse protection performed by an EGLA is also presented.

Description

technical field [0001] The invention relates to an external gap line lightning arrester and a transmission line impact protection method thereof. Background technique [0002] Protection of transmission lines from the risk of lightning-induced flashovers can be achieved through the use of external gap line arresters (EGLA) electrically connected in parallel with the line insulator on the transmission line pylon. EGLAs traditionally consist of a single external gap in series with a series varistor unit (SVU). When lightning strikes the transmission line, the series gap is sized for a spark discharge, which conducts the SVU and allows the lightning surge current to be diverted safely to ground without flashover of the line insulator. An SVU may be overloaded for many reasons and it is important that the lines be energized and remain operational even if the SVU is out of service. Therefore, conventionally, the clearance distance has to be dimensioned sufficiently large to ens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T1/14H01C7/12H02G13/00H02H9/06
CPCH02H9/06H01C7/126H01T1/14H02G13/40H01T4/02H01T4/16H01C7/12H01C8/04
Inventor H·鲁科莱宁
Owner HITACHI ENERGY SWITZERLAND AG