High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Operating mechanism structure or arrangement
Patent
1998-09-14
2000-06-06
Donovan, Lincoln
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Operating mechanism structure or arrangement
218 67, 218 84, H01H 300, H01H 324, H01H 332, H01H 3334
Patent
active
060721421
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a switch assembly for high voltage overhead lines.
2. Discussion of the Background
Switch assemblies are, as a rule, constructed so that one and the same stand supports either a circuit breaker or a circuit disconnector, both of which are provided with a supporting insulator. This results generally in a simple and inexpensive stand construction with associated operating means. On the other hand, a relatively large amount of space is required when each function has its own stand, which results in a considerable total area for the switchgear as a whole. This large total ground area required by the switchgear is disadvantageous when land prices are high, when space is limited and when preparation of the ground is very demanding. The costs entailed by assembly and foundation work are also very high.
It is known from FR 2 662 568 to mount a circuit breaker and a circuit disconnector on a common frame, as illustrated in FIG. 4 of this prior publication. However, this known construction does not afford any appreciable reduction in space requirements for several reasons. For instance, the disconnectors and circuit breakers are not mounted in a manner that is beneficial in this respect. The construction also requires a stand that includes several widely spaced anchoring points. The large amount of ground space required by this stand makes it difficult to achieve a compact switchgear lay-out, particularly when wishing to maintain accessibility for service vehicles and the like between the rows of stands. Because the stand taught by this publication requires a plurality of anchorage points, it affords no appreciable reduction in foundation costs. It is also thought that correct erection of the stand would be difficult to achieve and entails costly assemblage. Corresponding constructions are also known from US-A4 541 033 and DE-C-693 808, although these constructions are also encumbered with corresponding drawbacks with regard to space requirements.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a switch assembly for high voltage overhead lines that reduces the total space requirement and also brings down assembly costs, with the intention of providing switchgear that covers a smaller area and improves the total economy.
This object has been achieved in accordance with the present invention with a switch assembly of the kind defined in the preamble of claim 1 and having the characteristic features set forth in the characterizing clause of said claim.
Because both circuit breaker and circuit disconnector are mounted on one and the same stand with one single support base, the number of stands required in a single switchgear is reduced to a minimum in comparison with conventional techniques, while a switch assembly having such a stand will, in itself, be space saving and easier to erect.
According to one preferred embodiment of the invention, the stand also carries a current meter and earthing means, therewith also contributing to structural compactness.
The disconnectors are preferably mounted on and carried by the circuit breakers. This obviates the need for separate disconnector supporting insulators and disconnector stand members, therewith further contributing towards a compact switch assembly.
The disconnectors are preferably maneuvered by obliquely directed maneuvering insulators that extend from the operating end of each disconnector down to a central part of the stand.
In another preferred embodiment, the stand support base comprises a base plate that can be adjusted both vertically and angularly. This enables the switch assembly to be readily aligned correctly in relation to the overhead high voltage lines.
The disconnectors may conveniently have a pantograph configuration and may be disposed in selected angular positions relative to remaining parts of the switch assembly, therewith affording a high degree of flexibility in configuring the switchgear lay-out. When the switch assembly includes c
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Linder Torbjorn
Skold Leif
ABB AB
Donovan Lincoln
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