JPH10321085A - High-voltage load switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce consumption and deformation of a contact and secure stable action at the time of closing/breaking. SOLUTION: This switch is housed in a container 11 and constructed, such that a current flowing in a circuit is brought into conduction/cut off by connecting/separating a movable contact 32 to/from a fixed contact 22 by using an external operation handle. In this event, the movable contact 32 or the fixed contact 22 is adapted to have current-carrying parts 321, 221 respectively for carrying a load current electrically and arc-generating parts 322, 222 respectively which each make contact with the counter contact first and are thereafter separate therefrom during the time of closing action, and are separated last during the time of breaking action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage load switch housed in a container made of iron or stainless steel.

[0002]

2. Description of the Related Art A high-voltage load switch is a device used for opening and closing circuits such as transmission and distribution lines, substation buses and devices, is housed in a container, and flows into the circuit by an external operation handle. Turns on and off the current. And SF6 gas is stored in the container.

In a conventional high-voltage load switch, a fixed contact and a movable contact are used to supply, supply, and cut off a load current. Therefore, an arc is generated in both contacts at the time of closing and breaking, causing various problems. In order to solve this, as shown in FIG.
2 'has been proposed that includes an energizing contact 321' and an arc contact 322 'for generating and extinguishing an arc when the load is opened and closed (for example, Japanese Patent Application Laid-Open No. 2-16).
However, the arc contact 322 ′ is in contact with the fixed contact 22 ′ even when energized, and a load current flows.
After all, a problem had arisen.

In a conventional main circuit energizing contact 321 'or a high-voltage load switch including a main circuit energizing contact 321' and an arc contact 322 ', the main circuit energizing contact is generated by the occurrence of an arc when the load is opened and closed. 321 ′ or the entire tip of the arc-extinguishing arc contact 322 ′ is consumed, so that the amount of consumption increases, the amount of dust in the switch increases, and the contact wears and deforms. The reliability of the contact due to the displacement or the roughening of the contact surface is impaired. Furthermore, since the insertion force at the time of insertion into the fixed contact 22 'side increases, the closing / cutting operation mechanism 42' needs to be strong.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to reduce the interruption of the closing / closing operation due to a portion which is consumed or deformed by the occurrence of an arc, and can maintain a good contact state when the load is energized. The present invention provides a high-voltage load switch that does not require a strong closing / opening operation mechanism in order to temporarily increase the insertion force when the movable contact is inserted into the fixed contact.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for supplying a current flowing in a circuit by connecting / disconnecting a movable contact to / from a fixed contact by an external operation handle.
In the high-voltage load switch to be interrupted, the movable contact or the fixed contact is an energizing unit that electrically applies a load current,
During the closing operation, it first contacts the contact of the other party and then separates,
And it is a high voltage load switch which has an arc generating part which opens last at the time of interruption | blocking operation | movement.

Further, according to the present invention, the movable contact has a blade-like shape and has an arc generating portion at the tip, while the fixed contact is a parallel blade receiving piece and has a tip at the tip. This is a high-voltage load switch having an arc generator on one side.

The present invention is a high-pressure gas load switch which is housed in a container together with SF6 gas, and wherein the arc generating portion is a projection.

[0009]

According to the high-voltage load switch of the present invention, an arc-generating portion is provided in addition to a portion energizing a movable or fixed contact (a portion that is in contact and sliding). An arc is generated at the earliest time during the closing operation, but is opened at the end of the closing operation, and the arc is generated until the latest at the time of the opening operation. Has no effect when the load is energized, and
Disturbing the closing and closing operations can be temporary.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. One embodiment of the high-voltage load switch of the present invention will be described with reference to FIGS.

The high-voltage load switch of this embodiment has a case 11 made of stainless steel or iron, a power supply-side bushing 21, a load-side bushing 31, an operation handle 41, and the like. The case 11 is formed in a square box shape, and
The power supply side bushing 21, the load side bushing 31, and the operation handle protrude to the outside.
The fixed contact 22, the movable contact 32, the opening / closing operation mechanism 42 and the like are housed therein, and SF6 gas is sealed therein. The power supply side bushing 21 is connected to the fixed contact 22, and the fixed contact 22 is formed in the shape of a parallel blade receiving piece, and has an energizing section 221 and an arc generating section 222. . The arc generating part 222 is provided at one end of the parallel blade receiving piece as shown in FIG. The load-side bushing 31 is connected to the movable connector 32, and the movable contact 32 is formed in a blade shape.
And an arc generating part 322 formed as a separate body
And a frame part 323. Arc generator 3
22 is provided at the tip. The load current at the time of closing flows through the energizing section 221 of the fixed contact 22 and the energizing section 321 of the movable contact 32.
The load current temporarily flows through the arc generating part 322 of the movable contact 32 during the closing operation and the breaking operation. The frame 323 of the movable contact 32 is
2 to rotate the movable contact energizing section 321 and the movable contact arc generating section 322. The operation mechanism 42
It is mechanically connected to the operation handle 41 and the frame part 323, and when the operation handle 41 is rotated,
The operation mechanism 42 operates to rotate the energizing section 321 and the arc generating section 322 of the movable contact 32 via the frame section 323 to approach or move away from the energizing section 321 and the arc generating section 322 of the fixed contact 22. .

The positional relationship and the electrical connection between the fixed contact 22 and the movable contact 32 during the closing operation will be described below. (11) When the movable contact 32 rotates and approaches the fixed contact 22 to a predetermined distance, the movable contact arc generator 32
2 and the fixed contact arc generator 222 first approach each other, so that an arc is generated between the two arc generators 222 and 322. (12) The arc generators 222 and 322 of both contacts come into contact, and the arc is extinguished. (13) The current-carrying parts 221 and 321 of both contacts also come into contact.
At this time, no arc is generated because the two arc generating units 222 and 322 are already connected. (14) The movable contact 32 further rotates, and the arc contact portions 222 and 322 are separated from each other.
1, 321 maintain the connection. Therefore, energization is ensured.

Next, the two contacts 11, 3 in the breaking operation
The positional relationship and electrical connection of No. 2 will be described below. (21) The energizing parts 221 and 321 of both contacts are connected, but the arc generating parts 222 and 322 are separated. (22) The movable contact 32 rotates and the two arc generating portions 22
2,322 also contact. (23) When the movable contact 32 further rotates,
21 and 321 are separated from each other.
Since 22 is in contact, no arc is generated. (24) When the movable contact 32 rotates greatly, both arc generating parts 222 and 322 are also separated, and an arc is generated. Since the current-carrying portions 221 and 321 are separated from the arc-generating portions 222 and 322, no arc is generated, and there is no wear or deformation due to the arc. It is the two arc generating parts 222 and 322 that are consumed and deformed by the arc. (25) The arc is extinguished when rotated away from the predetermined distance. As described above, the arcs are generated by the arc generators 222 and 322 of the two contacts, and when the load current is flowing, the arc generators 222 and 3 of the two contacts are generated.
22 are separated, the arc generating portions 22 of both contacts
Even if the arcs 2 and 322 are worn and deformed by the arc, no load current flows through the arc and no adverse effect is caused.

A modification of the shape of the arc generators 222 and 322 of both contacts will be described with reference to FIG. FIG.
(A) shows the fixed contact 22 and the movable contact 3
2 are partially protruded so that the arc generating parts 222 and 32
2. FIG. 4 (b) shows an arc generator 222 provided at the tip of the fixed contact 22 inclining. FIG. 4C shows the fixed contact 2
An arc generating part 222 is formed by projecting the root side of the tip of No. 2. 4 (a) to 4 (c) are formed as projections so as to protrude the arc generating portion 222 provided at the tip, so that they contact first at the time of closing and last at the time of cutoff. Is reliably performed. When the projection is provided and the SF6 gas is used, the arc is not diffused in combination with the concentration of the arc of the SF6 gas, so that a good high-pressure gas load switch can be obtained.

Further, with respect to a modified example of the movable contact 32,
This will be described with reference to FIG. The movable contact 32 has a current-carrying portion 321 formed in a blade shape and an arc generating portion 322 formed at the tip thereof, and is connected to the load-side bushing 31 via a frame portion 323. . The conducting part 321 and the arc generating part 322 are formed integrally. The operation mechanism 42 is connected to the operation handle 41 and the frame portion 323, and when the operation handle 41 is rotated, the operation mechanism 42 operates and the frame portion 32
The rotating operation of the movable contact 32 is executed via the control unit 3. When the operating handle 41 is rotated at the time of closing and closing, the operating mechanism 42 and the frame portion 323 cause the movable contact 32 to rotate.
Rotates, and the movable contact 32 approaches or separates from the fixed contact 22. Both energizing sections 221, 321 and both arc generating sections 2
The positional relationship between 22, 22, and the like is the same as that shown in FIG. The energization of the main circuit and the turning on and off of the load current are performed by the movable contact 32. The shape of the movable contact is shown in FIG.
4 (a), 4 (a), 4 (b) or 4 (c), by forming the protrusions, the current-carrying portion 221 of the contactor,
321 can be provided without any consumption or deformation.

[0016]

According to the present invention, it is possible to reduce the wear of the contacts due to the arc at the time of switching the load of the high-pressure gas switch, thereby reducing the generation of dust. The reliability of energization is ensured by making the wear of the contact by the arc at the time of load switching different from the energized part, and the operation of the contact is always stable without the influence of the wear of the contact on the operation mechanism. Can be secured.

[Brief description of the drawings]

FIG. 1 is an explanatory front perspective view of the appearance of a high-voltage load switch.

FIG. 2 is an explanatory view of an embodiment of the high-voltage load switch of the present invention.

FIG. 3 is an explanatory view of an example of a contact of the high-voltage load switch of the present invention.

FIG. 4 is an explanatory view of a modified example of the contact of the high-voltage load switch of the present invention.

FIG. 5 is an explanatory view of a modification of the high-voltage load switch of the present invention.

FIG. 6 is an explanatory diagram of a conventional high-voltage load switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Case 21 Power supply side bushing 22 Fixed contact 221 Fixed contact energizing part 222 Fixed contact arc generating part 31 Load side bushing 32 Movable contact 321 Movable contact energizing part 322 Movable contact arc generating part 323 Frame part 41 Operating handle 42 Operation mechanism

Claims (3)

[Claims] 1. A high-voltage load switch that is housed in a container and that connects and disconnects a movable contact with a fixed contact by an external operation handle to turn on and off a current flowing through a circuit. Alternatively, the fixed contact has an energizing section that electrically supplies a load current, and an arc generating section that is first opened during contact with the counterpart contact at the time of the closing operation and then opened at the time of cutoff. A high-voltage load switch. 2. The high-voltage load switch according to claim 1, wherein the movable contact has a blade-like shape and has an arc generating portion at a tip, and the fixed contact has a parallel blade receiving piece. And a high-voltage load switch having an arc generating part at one of its ends. 3. The high-pressure gas load switch according to claim 1, wherein the arc generator is housed in a container together with SF6 gas, and the arc generating portion is a projection.