JP2513569Y2 - Switch - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch, such as a pole switch, in which a three-phase charging section is housed in a switch case.

[0002]

2. Description of the Related Art Conventionally, in the case of a pole switch, for example, this type of switch has a structure as shown in FIGS. 3 and 4, and a front wall and a rear wall of a switch case 1 are provided on the left and right sides respectively. The three-phase bushings 2 and 3 arranged in the direction are hermetically penetrated, and the terminal conductors 4 and insulating cylinders necessary for passing and blocking the current between the respective conductors of the bushings 2 and 3 facing each other are provided. 5, connect with the movable conductor 6 and the flexible lead 7,
The insulating lever 9 for each phase fixed to the main shaft 8 in the left-right direction is connected by the connecting member 10 of the movable conductor 6, and the movable conductor 6 is moved back and forth by the forward and reverse rotation of the main shaft 8 to open and close the insulating cylinder 5. The element is turned on and off. Both ends of the switching element are connected to the terminal conductor 4 and the movable conductor 6, respectively.

[0003]

In the switch having the above-mentioned structure, when a three-phase ground fault or a short-circuit accident occurs in the case 1, the generated arc is generated in the case 1 as shown in FIG. The bushing 2 is likely to be stagnant between the periphery of the attachment hole for the bushing 2 and the terminal conductor 4, and the bushing 2 located therebetween is damaged by the arc, and the bushing 2 is cracked.
This moves to a portion of the bushing 2 outside the case 1, and finally the bushing 2 falls off, which may cause harm to the public. Moreover, the arc length of the generated arc is not constant,
The internal pressure of the case 1 rises due to the arc energy, and there is a risk of damaging the case 1.

The present invention has been made in consideration of the above problems of the prior art, and its purpose is to prevent internal ground fault, bushing damage due to arc at short-circuit accident, and increase in internal pressure. It is to provide a switch which can prevent the case from being damaged.

[0005]

In order to achieve the above object, a switch according to the present invention has a three-phase structure in which a front wall and a rear wall of a switch case are arranged in the left-right direction and are hermetically penetrated. Each bushing, a terminal conductor connecting between the respective conductors of the bushings facing each other, an insulating tube, a movable conductor and a flexible lead, and an insulating lever for each phase fixed to the main shaft in the left-right direction, A connecting tool that connects the insulating lever and the movable conductor, both ends of which are connected to the terminal conductor and the movable conductor, and which is adjacent to the opening / closing element in the insulating cylinder that inserts and cuts the movable conductor by back and forth movement. Between the terminal conductors and between the adjacent flexible leads, respectively, iron,
An arc horn made of stainless steel or the like, a base portion fixed to the case, a tip end supporting the arc horn, and a conductive support rod grounded together with the case, the terminal conductor and the arc horn. And a gap between the flexible lead and the arc horn satisfy a predetermined insulation dimension and are set to a minimum dimension.

[0006]

In the switch having the above-mentioned structure, when a three-phase ground fault or a short-circuit accident occurs inside the switch case, the generated arc stagnates between the charging part of each phase and the arc horn,
The bushing is no longer exposed to the arc and damage to the bushing is prevented. It said arcing horn, you place minimized a position within the gap satisfies predetermined <br/> dielectric strength required for this kind switch between the live parts
As a result , the arc energy can be kept constant and minimized, the internal pressure of the case can be prevented from rising, and the case can be prevented from being damaged.

[0007]

EXAMPLES Examples will be described with reference to FIGS. 1 and 2. The same symbols as those used above indicate the same or corresponding ones. In these figures, the conventional differs, switch case 1 in each phase of each arcing horn between the flexible lead 7 dielectric strength to be weakest between adjacent terminal conductors 4 and adjacent ones of the charging unit 11 and the The arc horns 11 and 12 are made of iron, stainless steel or the like, and the bases of the arc horns 11 and 12 are supported by the tips of the conductive support rods 13 and 14 fixed to the case 1. It is grounded together with Case 1. Here, the terminal conductor 4 of each phase
The gap between the arc horn 11 and the arc horn 11 and the gap between the flexible lead 7 of each phase and the arc horn 12 are set to the size that satisfies the predetermined insulation size required for the switch and is the minimum size. ing.

Therefore, when a three-phase ground fault or a short-circuit accident occurs inside the case 1, the generated arc stagnates between the terminal conductor 4 and the arc horn 11 as shown in FIG. The arc will be extinguished when the distribution line breaker of the power transmission source accidentally cuts off, and the bushing 2
Damage due to the arc is prevented. Moreover, the arc length of the generated arc is constant between the terminal conductor 4 and the arc horn 11, and since the gap between them is set small, the arc energy is constant and minimized, and the pressure rise in the case 1 increases. Can be suppressed to a minimum and damage to the case 1 can be prevented.

[0009]

Since the present invention is constructed as described above, it has the following effects. Between the charging parts of each phase stored in the switch case , that is, adjacent
Place the arc horns between the terminal conductors and between the adjacent flexible leads , support them with conductive support rods, and ground them.
Therefore, with a simple structure, the arc at the time of internal ground fault or short circuit can be stagnated in the arc horn to prevent the bushing from being damaged by the arc, and the terminal conductor, the flexible lead and the arc.
The gap between the horn and the horn meets the specified insulation dimensions,
Due to the set to a dimension having the smallest, it becomes possible to minimize the arc energy to the arc length constant, to prevent damage to the case by pressing the increase in internal pressure is allowed <br/> ability It is a thing.

[Brief description of drawings]

FIG. 1 is a cutaway plan view showing an embodiment of a switch according to the present invention.

FIG. 2 is a cut front view of FIG.

FIG. 3 is a cut plan view of a conventional example.

FIG. 4 is a cut side view of FIG.

[Explanation of symbols]

 1 Switch case 2,3 Bushing 4 Terminal conductor 7 Flexible lead 11,12 Arc horn

Claims (1)

(57) [Scope of utility model registration request] 1. A front wall and a rear wall of a switch case, respectively.
The three phases are arranged in the left-right direction and are hermetically pierced.
Connect the bushing and each conductor of the bushing facing each other for each phase.
A continuous terminal conductor, an insulating tube, a movable conductor and a flexible lead, an insulating lever for each phase fixed to the main shaft in the left-right direction, a connector for connecting the insulating lever and the movable conductor, and both ends of the connector. Connected to the terminal conductor and the movable conductor,
Opening and closing inside the insulating cylinder that inserts and removes the movable conductor by back and forth movement
Between the element and the adjacent terminal conductor and the adjacent flexible lead
Between them, and is made of iron, stainless steel, etc.
The arc horn and the base are fixed to the case, and the arc horn is attached to the tip.
Conductive support that supports the ground and is grounded with the case
A rod, between the terminal conductor and the arc horn, and the flexible relay.
The gap between the cord and the arc horn is
The opening size is set to the minimum size that satisfies the edge size.
Closure.