US 4,307,273 AGranted

Gas blast circuit breaker

AssigneeHitachi, Ltd.

InventorsKoji Sasaki, Tuneo Kishi

Life of this patent

Estimating the term…

Abstract

A gas blast circuit breaker comprises one breaking assembly having a supporter and two breaking units at least movable contacts of which are supported on opposite ends of the supporter, and the other breaking assembly having a supporter and a single breaking unit at least a movable contact of which is supported on one end of the supporter. The two breaking assemblies are so arranged as to have only one breaking unit between the two supporters, whereby flows of blasting gas in the three breaking units of the two breaking assemblies can be prevented from interferring with each other.

Claims16

Dependent claims

A gas blast circuit breaker comprising:

an enclosing container filled with an arc extinguishing gas;
first and second insulator supporting cylinders mounted in said container with a predetermined spacing therebetween, each having a first end fixed to said container and a second end disposed within said container;
first and second support means fixed to said second ends of said first and second insulator supporting cylinders, respectively;
first and second link mechanisms supported by said first and second support means, respectively;
first and second insulator operating rods extending in said first and second insulator supporting cylinders, respectively, and each connected at a first end to a first end of said link mechanism;
driving means operatively connected to both second ends of said first and second insulator rods so as to simultaneously operate said first and second link mechanisms;
first, second and third breaking units mounted in said enclosing container and each including contact means having first and second contacts operative to close and open therebetween and compressor means for producing a compressed arc extinguishing gas and for blasting said compressed gas to said contact means in response to the opening of said contacts, said first breaking unit is supported and disposed between said first and second support means, said second and third breaking units are supported and disposed at ends of said first and second support means opposite said first breaking unit, respectively;
a balancing load providing unit disposed between said first breaking unit and said second support means and having compressor means whose capacity substantially the same as that of the compressor means of said breaking units;
first connecting means for operatively connecting said second contact of said first and second breaking units to a second end of said first link mechanism;
and
second connecting means for operatively connecting said second contact means of said third breaking unit and said compressor means of said balancing load providing unit to a second end of said second link mechanism so as to restrict imbalance between respective loads of said third breaking unit and said balancing load providing unit applied to said link mechanism of said second breaking unit.

8 more elements

A gas blast circuit breaker comprising:

an enclosing container filled with an arc extinguishing gas,
first and second support means arranged with a predetermined spacing therebetween within said enclosing container,
first and second insulating support means for supporting said first and second support means respectively,
a first breaking unit arranged between and supported by ends of said first and second support means so as to electrically connect said first and second support means,
a second breaking unit supported on an end of said second support means remote from said first support means,
a third breaking unit supported on an end of said first support means remote from said second support means, and
said breaking units having a first and second contacts operable to open and close, said first contact being associated with a cylinder means, said second contact being associated with a piston means, thereby forming a compressor means for blasting an arc extinguishing gas between said first and second contacts when opened,
a first link mechanism arranged within said first support means having first ends connected to said second contact of said first and third breaking units,
a first insulator rod arranged within said first insulating support means having a first end operatively connects to a second end of said first link mechanisms,
a second link mechanism arranged with said second support means having a first end connected to said second contact of said second breaking unit,
a second insulator rod arranged within said second insulating support means having a first end operatively connected to a second end of said second link mechanisms,
an actuator operably connected to second ends of said insulator rods for simultaneously opening and closing said first and second contacts of said first, second and third breaking units.

9 more elements

A gas blast circuit breaker comprising:

an enclosing container filled with an arc extinguishing gas,
first and second support means arranged with a predetermined spacing therebetween within said enclosing container,
first and second insulator supporting cylinders for supporting said first and second support means, respectively,
a first breaking unit arranged between said first and second support means and having a movable contact switchably supported on said second support means,
a second breaking unit supported on one end of said second support means remote from said first support means and having a movable contact switchably supported on said second support means,
a third breaking unit supported on one end of first support means remote from said second support means and having a movable contact switchably supported on said first support means,
a first insulator operating rod arranged within said first insulator supporting cylinders supporting said first support means and having a first end operably connected to the movable contacts of said first and third breaking units,
a second insulator operating rod arranged within said second insulator supporting cylinders supporting said second support means and having a first end operably connected to the movable contact of said second breaking unit,
a common actuator connected to a second end of the respective first and second insulator operating unit,
dummy load generating means supported on the other end of said second support means opposing to said first end of said second insulator operating rod, said dummy load generating means providing a load which restricts a load of said second breaking unit on said second insulator operating rod from biasing said second insulator operating rod.

7 more elements

Dependencies are inferred from the claim text.

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Abstract

A gas blast circuit breaker comprising:

an enclosing container filled with an arc extinguishing gas;
first and second insulator supporting cylinders mounted in said container with a predetermined spacing therebetween, each having a first end fixed to said container and a second end disposed within said container;
first and second support means fixed to said second ends of said first and second insulator supporting cylinders, respectively;
first and second link mechanisms supported by said first and second support means, respectively;
first and second insulator operating rods extending in said first and second insulator supporting cylinders, respectively, and each connected at a first end to a first end of said link mechanism;
driving means operatively connected to both second ends of said first and second insulator rods so as to simultaneously operate said first and second link mechanisms;
first, second and third breaking units mounted in said enclosing container and each including contact means having first and second contacts operative to close and open therebetween and compressor means for producing a compressed arc extinguishing gas and for blasting said compressed gas to said contact means in response to the opening of said contacts, said first breaking unit is supported and disposed between said first and second support means, said second and third breaking units are supported and disposed at ends of said first and second support means opposite said first breaking unit, respectively;
a balancing load providing unit disposed between said first breaking unit and said second support means and having compressor means whose capacity substantially the same as that of the compressor means of said breaking units;
first connecting means for operatively connecting said second contact of said first and second breaking units to a second end of said first link mechanism;
and
second connecting means for operatively connecting said second contact means of said third breaking unit and said compressor means of said balancing load providing unit to a second end of said second link mechanism so as to restrict imbalance between respective loads of said third breaking unit and said balancing load providing unit applied to said link mechanism of said second breaking unit.

8 more elements