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Vacuum switchgear

a switchgear and vacuum technology, applied in the direction of electrical apparatus construction details, conductors, casings/cabinets/drawers, etc., can solve the problem of no longer accelerating charged particles generated by dielectric breakdown, and achieve the effect of preventing damage to devices, and preventing ground faults

Inactive Publication Date: 2005-05-19
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution effectively prevents dielectric breakdowns from causing ground faults and power system failures by ensuring the shields and conductors reach the same potential, eliminating the electric field acceleration of charged particles and restoring dielectric strength instantly, thus protecting the devices and maintaining system reliability.

Problems solved by technology

However, since the shield is insulated from the vacuum container, an electric field between the conductors and the shield disappears, no longer accelerating charged particles generated by the dielectric breakdown.

Method used

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Examples

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Embodiment Construction

[0013] An embodiment of the invention will be now described with reference to the accompanying drawings. FIG. 1 is a vertical sectional view of a vacuum switchgear showing the embodiment of the invention. In FIG. 1, the vacuum switchgear is represented by one phase of one unit in a power receiving and distribution board comprised of a plurality of units. In this embodiment, a main circuit switching unit 10, an isolator 20, flexible conductors 63, 64, an earthing device 30 and so on are accommodated in vacuum containers 1, 2 that need to be grounded, i.e., in the vacuum containers which are grounded and formed of a metal (stainless steel). A conductor 61 and a main circuit conductor 62 are arranged to extend inside and outside the vacuum containers 1, 2.

[0014] The main circuit switching unit 10 has a movable electrode 11 and a stationary electrode 12 and is installed in the vacuum container 1, separated by a spacer 15 from the isolator 20. An intermediate shield 13 is arranged aroun...

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Abstract

A main circuit switching unit and an isolator are accommodated in a vacuum container. A first conductor and a main circuit conductor are arranged to extend in and out of the vacuum container. A movable electrode of the main circuit switching unit is connected to the first conductor through a first flexible conductor, and a movable electrode of the isolator is connected to the main circuit conductor through a second flexible conductor. A shield is arranged around the first conductor and the main circuit conductor. Another shield is arranged around a connecting portion between the first flexible conductor and the movable electrode of the main circuit switching unit. A still another shield is arranged around the isolator. A further another shield is arranged around the second flexible conductor. These shields are secured to the vacuum container through insulating spacers. This arrangement instantly eliminates a dielectric breakdown phenomenon that occurs at electric field concentrated regions by the shields to prevent a dielectric breakdown caused by particulate foreign matters and thereby improve an insulation reliability of the devices.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a vacuum switchgear and more particularly to a vacuum switchgear, in which a switch having a stationary electrode and a movable electrode is enclosed in a vacuum container that requires grounding. [0002] As a conventional vacuum switchgear, for example, there is a construction, in which a vacuum container accommodates a main circuit switching unit for connecting and disconnecting a main circuit conductor to and from a load side conductor or a bus side conductor and a main circuit / earth selecting unit for connecting the main circuit conductor to and from the bus side conductor or the load side conductor and an earthing conductor and in which the vacuum container is formed of a grounded metal or an insulating material with a grounded layer on its surface. This vacuum container accommodates the main circuit conductor and a part of each of the bus side conductor, the earthing conductor and the load side conductor. Furth...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01B1/00H02B13/055H01H1/58H01H31/00H01H33/02H01H33/66H01H33/662H01H33/666H02B13/02H05K5/00H05K9/00
CPCH01H1/5822H01H31/003H01H33/022H01H2033/6668H01H33/6661H01H2033/66284H01H33/66261H01H33/66
Inventor UTSUMI, TOMOAKISATOU, KAZUHIROSHIRONE, TAKASHITSUCHIYA, KENJIKOBAYASHI, MASATO
Owner HITACHI LTD
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