JPH04112435U - switch - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent bushing damage due to arcing during ground faults and short circuits inside the switch case. [Structure] In a switch in which three-phase live parts are collectively housed in the switch case 1, an arc horn 11, 1 is installed between the terminal conductors 4 of each phase and the flexible leads 7 in the switch case 1
2, the arc generated during an internal ground fault or short circuit is stagnated between the terminal conductor 4, the flexible lead 7, and the arc horns 11, 12.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention stores three-phase live parts all at once in the switch case, such as in pole-mounted switches. Regarding the switch made by

0002

[Conventional technology]

Conventionally, this type of switch, for example, in the case of a pole-mounted switch, has a structure as shown in Figs. 3 and 4. They are arranged in the left and right direction on the front and rear walls of the switch case 1, respectively. The bushings 2 and 3 of the three phases are installed airtightly, and the bushings 2 and 3 of each phase facing each other are installed. , 3, terminal conductor 4, insulation necessary for passing and interrupting current between the respective conductors. Each tube is connected by a cylinder 5, a movable conductor 6, and a flexible lead 7, and is fixed to a main shaft 8 in the left and right direction. The insulating levers 9 for each phase are connected by the connector 10 of the movable conductor 6, and the main shaft 8 rotates forward and backward. The movable conductor 6 is reciprocated to open and close the opening/closing element inside the insulating tube 5. Ru. Note that both ends of the opening/closing element are connected to the terminal conductor 4 and the movable conductor 6, respectively. Ru.

0003

[Problem that the idea aims to solve]

In the switch with the above configuration, a three-phase ground fault and short circuit accident occurred inside case 1. In this case, the generated arc is for bushing 2 of case 1, as shown in Fig. 4, for example. The bushing 2 tends to stagnate between the mounting hole periphery and the terminal conductor 4, and is located between the two. is damaged by the arc, causing a crack in bushing 2, and this In case 2, the situation moves to the outside part of case 1, and finally bushing 2 falls off, causing harm to the public. There is a danger of inviting Moreover, the arc length of the generated arc is not constant, and the arc energy There is also a risk that the internal pressure of the case 1 will rise and the case 1 will be damaged.

0004 The present invention has been made in consideration of these problems of the conventional technology. The purpose of this is to protect the bushing from arcing in the event of an internal ground fault or short circuit accident. It is an object of the present invention to provide a switch that can prevent damage to the case due to damage or increase in internal pressure.

[0005]

[Means to solve the problem]

In order to achieve the above object, the switch of the present invention has three parts in the switch case. The live parts of each phase are stored together, and the live parts of each phase are stored separately between the live parts of each phase in the switch case. Place the arc horn.

[0006]

[Effect]

With the switch configured as described above, three-phase ground faults and short circuit accidents occur inside the switch case. When an arc occurs, the generated arc becomes stagnant between the live parts of each phase and the arc horn, and The bushing is no longer exposed to arcing and damage to the bushing is prevented. Ru. The gap between the arcing horn and the live part is the absolute required for this type of switch. Arc energy can be kept constant by placing it at the minimum position within the range that satisfies the edge strength. The pressure can be kept to a minimum, suppressing the increase in internal pressure of the case and preventing damage to the case. can.

[0007]

【Example】

An example will be explained using FIGS. 1 and 2. In addition, the same symbols as above are the same. Or something equivalent shall be indicated. In these drawings, the difference from the conventional one is the live parts of each phase inside the switch case 1. There is an arc between the terminal conductors 4 and the flexible leads 7, which are the weakest in terms of insulation strength. This is the point where the horns 11 and 12 are arranged, and these arc horns 11 and 12 are made of iron, It is made of stainless steel, etc., and is supported by conductive support rods 13 and 14 in the case 1. It is grounded together with case 1. Here, the gap between the terminal conductor 4 and the arc horn 11 of each phase and the The gap between the flexible lead 7 and the arcing horn 12 provides the required insulation for the switch. The dimensions are set to the minimum size that satisfies the requirements.

[0008] Therefore, if a three-phase ground fault or short circuit accident occurs inside Case 1, the For example, as shown in FIG. 1, the arc stops between the terminal conductor 4 and the arc horn 11 After a certain period of time, the arc can be extinguished when the distribution line breaker at the power transmission source accidentally shuts off. Therefore, damage to the bushing 2 due to arcing is prevented. Moreover, the arc length of the generated arc is between the terminal conductor 4 and the arc horn 11. is constant, and the gap between them is set small, so the arc The energy is constant and minimal, and the pressure increase inside case 1 can be kept to a minimum. This makes it possible to prevent the case 1 from being damaged.

[0009]

[Effect of the idea]

Since the present invention is configured as explained above, it achieves the effects described below. do. Arc horns are placed between the live parts of each phase housed in the switch case. With this simple configuration, arcs caused by internal ground faults and short circuits can be stagnated in the arc horn. It prevents damage to the bushing due to arcing, and maintains a constant arc length to reduce arc energy. This makes it possible to suppress the pressure to a minimum, suppressing the increase in internal pressure and preventing damage to the case. It also becomes possible to do so.

[Brief explanation of drawings]

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

FIG. 2 is a cutaway front view of FIG. 1;

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

FIG. 4 is a cutaway side view of FIG. 3;

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A switch comprising three phases of live parts housed together in a switch case, and arcing horns arranged between the live parts of each phase in the case.