JPH0528902A - Circuit breaker equipped with current limiter - Google Patents

Abstract

PURPOSE:To reduce the rate of temperature rise of each contact using simple means without enlarging the conductor of each electrically conductive portion. CONSTITUTION:A current limiter 2 having current-limiter side switching portions 10-17 comprising more than one pair of contacts is mounted on a circuit breaker 1 having breaker side switching portions 5-8 having one pair of contacts per pole. A heat conducting bypass member 20 is provided for allowing heat to dissipate to a current-limiter side terminal portion 3 from the breaker side switching portions 5-8 without passing through the current-limiter side switching portions 10-17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker with a fault current limiter.

[0002]

2. Description of the Related Art A conventional circuit breaker with a current limiting device will be described with reference to FIG. In the figure, 1 is a circuit breaker, 2 is a current limiter, 3 is a power supply terminal, 4 is a load terminal, 5 is a movable contact, 6 is a movable contact, 7 is a fixed contact, 8 is a fixed contact, and 9 is a connection. Parts 10, 10 and 11 are fixed contacts, 12 and 13 are movable contacts, 14 and 15 are fixed contacts, 16 and 17 are movable contacts, 1
Reference numeral 8 is an opening / closing mechanism portion, and 19 is a trip portion. In FIG. 2, the circuit breaker-side opening / closing section is composed of the movable contact 5, the movable contactor 6, the fixed contact 7 and the fixed contactor 8, and the fault current limiter side opening / closing section is the fixed contactor 10, 11 and the movable contactor. It is composed of children 12, 13, fixed contacts 14, 15 and movable contacts 16, 17.

In the circuit breaker with a fault current limiter constructed in this manner, the current flows from the power supply terminal 3 to the fault current limiter side switching parts 10-17.
And flows to the load terminal 4 through the circuit breaker-side switching parts 5 to 8.

[0004]

This type of circuit breaker with a fault current limiter has a circuit breaker-side opening / closing section 5 to 5 due to heat generated by the contact resistance of the contacts.
There is a problem in that the temperatures of the contacts 5 and 7 of No. 8 rise.
Therefore, in the conventional circuit breaker with a fault current limiter, each conductive part conductor located in the heat conduction direction shown by an arrow in FIG.
The above problems have been dealt with by suppressing the heat generated by the resistance of each conductive portion and improving the heat conduction. However, there is a problem in that the device becomes large in size and the cost increases when the conductors of the conductive parts are made large in this way.

The present invention has been made in order to solve the above problems, and does not increase the size of the conductors of each conductive portion.
An object of the present invention is to obtain a circuit breaker with a current limiting device that can reduce the temperature rise of the contacts by a simple means.

[0006]

A circuit breaker with a fault current limiter according to the present invention is provided for releasing heat from a breaker side opening / closing part to a fault current limiter side terminal without passing through the limiter side opening / closing part. The heat conduction bypass member is provided.

[0007]

In the present invention, heat escapes from the circuit breaker-side opening / closing section to the current limiter-side terminal section through the heat-conducting bypass member, and the heat-conducting path is shortened so that the amount of heat passing through the current-limiter side opening / closing section is reduced. As the amount of heat is reduced, the heat transfer efficiency is improved, and the temperature rise of the contacts of the circuit breaker-side switch is reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic side view, and the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, 20 is a heat conduction bypass member, which is the fixed contact 1.
0 near the connecting portion 9 and the power source terminal 3 of the fixed contact 11
It is connected to the near side.

The current is the same as the conventional one from the power supply terminal 3 to the current limiter side switching parts 10 to 17 and the circuit breaker side switching parts 5 to 8.
Through the load terminal 4 through the heat conduction bypass member 2
Since there is 0, the heat conduction direction is from the circuit breaker side opening / closing parts 5-8 to the heat conduction bypass member 20 as shown by the arrow in FIG.
It is bypassed to the power supply terminal 3 through the passage, and the amount of heat passing through the current limiter-side switching parts 10 to 17 is reduced, so that the heat conduction efficiency is improved and the contacts 5 and 7 of the circuit breaker-side switching parts 5 to 8 are Temperature rise is reduced.

[0010]

As described above, according to the present invention, the temperature rise of the contact can be reduced by the simple means of providing the heat conduction bypass member, so that the conductors of each conductive portion become large and the apparatus becomes large in size as in the prior art. It is possible to obtain the effect that the cost does not increase.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention.

FIG. 2 is a schematic side view showing a conventional one.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Current limiter 3 Terminal part 5-8 Circuit breaker side opening / closing part 10-17 Current limiter side opening / closing part 20 Heat conduction bypass member

Claims (1)

Claim: What is claimed is: 1. A circuit breaker having a circuit breaker-side opening / closing section consisting of a pair of contacts per pole, and a current limiting device having a current limiting-side opening / closing section consisting of a pair of contacts or more. In a circuit breaker with a fault current limiter, a heat conduction bypass member for releasing heat from the breaker side opening / closing part to the fault current limiter side terminal without passing through the limiter side opening / closing part A circuit breaker with a fault current limiter, characterized in that it is provided between the switchgear side opening / closing part and the current limiter side terminal part.