JPS6019469Y2 - Draw-out type circuit breaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a so-called high-voltage combination unit in which a current-limiting power fuse and a high-voltage contactor are combined in a 3kV to 5kV class high-voltage draw-out type circuit breaker unit.

Recently, many units of this type have been adopted as high-voltage combination units in which a current-limiting power fuse and a high-voltage contactor are mounted on a movable cart from the viewpoint of equipment downsizing, maintenance, inspection, etc.

That is, FIG. 1 is a side view showing a conventional example of this type.
2 is a high-voltage contactor, 2 is a current-limiting power fuse, and 3 is a current-carrying conductor to which the current-limiting power fuse 2 is fixed at one end and a main circuit current-carrying clip 4 is detachably attached to the other end.

5a is an insulating support that supports the current-carrying conductor 3; 6 has one end fixed to the insulating support 5b, supports and fixes the lower end of the current-limiting power fuse 2, and the other end is the power supply side connection conductor of the high-voltage contactor 1. (not shown).

One end of 7 is the load side connection conductor of the high voltage contactor 1 (not shown)
A current-carrying conductor, 9, is connected to the insulating support 5c, and a main circuit current-carrying clip 8 is detachably attached to the other end of the current-carrying conductor, 9.
1 is a truck frame, and rollers 10a, 10a' (not shown) and rollers 10b, 10b' (not shown) are attached to the front, rear, left and right ends of the truck frame 9, respectively.

The rollers 10 allow the truck frame 9 to move forward and backward (as shown, it can move left and right).

11a. Reference numeral 11b denotes a side plate frame vertically erected at the rear end (right end in the illustration) of the truck frame 9, and vertical frames arranged at the left and right ends of the truck frame 9 when viewed from the advancing/retracting direction; lla is a left side vertical frame; lla' (not shown) is the right side vertical frame.

12 is an operating circuit transformer, 13 is an operating circuit transformer 12
This is a transformer mounting plate that firmly supports the vertical frames 11a and lla' and is welded or screwed to the vertical frames 11a and lla'.

Although the illustration shows only one phase, generally multiple phases (
In the case of a three-phase circuit, the current-limiting power fuse 2 and its connecting current-carrying members are arranged in three-phase configurations.

The members described above that require an insulating space are each supported with a specified insulating space, and these members are fixedly mounted on the trolley frame 9 and constituted as a so-called drawer unit, and this drawer unit can be moved forward and backward. Therefore, it is configured as a so-called high-voltage combination starter that has the function of connecting and disconnecting an electric circuit at the detachable portion of the main circuit current-carrying clip 4.8.

When arranged in such a structure, 1) the members are stacked vertically, including the current-carrying conductor 7, the operating circuit transformer 12, the current-carrying conductor 6, and the current-limiting power fuse 2; Because of this arrangement, the height dimension becomes large.

2) Since electrically insulating spatial distances must be maintained between each member, the space becomes large and the dimension in the height direction cannot be reduced.

3) Since the members are stacked vertically, the center of gravity is high, which is disadvantageous against external mechanical forces such as vibration and impact.

4) There are drawbacks such as the number of parts for holding and fixing the main components (in this case, the current-limiting power fuse and the transformer for the operating circuit) increases, making it impossible to provide an inexpensive product.

This proposal was devised in view of the above-mentioned shortcomings, and the second and third sections are as follows.
The explanation will be given according to the embodiment shown in the figure.

Note that the same part numbers in the present embodiment and the conventional example have similar functions.

Reference numeral 1.4a denotes an insulating support, on which a current-carrying conductor 3 is fixedly supported on a horizontal surface, and a current-carrying conductor 15 is fixedly supported on a vertical surface with a specified electric insulation creeping distance.

16 is a substantially U-shaped vertical frame that is bent into one piece,
It has mounting legs at both ends and is fixed to the truck frame 9 with bolts 17.

An operating circuit transformer 12 is fixedly supported on the vertical surface of this U-shaped vertical frame 16.
The current-limiting type power fuse 2 is arranged so as to face the back side of S.

An insulating support 14a is fixed to the upper end of the U-shaped vertical frame, and a current-limiting power fuse 2 is fixedly supported via the insulating support 14a.

With such a structure, it is possible to eliminate the conventional drawbacks and provide an inexpensive, small-sized drawer unit.

In this way, the present invention arranges the fuse 2 and the transformer 12 on the front and back sides of the vertical frame 16, respectively, and makes it possible to downsize the unit while balancing the load, which leads to a reduction in the overall size of the device. The effect is huge.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional example, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is a perspective view of essential parts of the embodiment of the present invention. 1... High-voltage contactor, 2... Current-limiting power fuse, 3... Current-carrying conductor, 4...
Main circuit energizing clip, 5a, 5b, 5c...
・Insulating support, 6... Current conductor, 7...
... Current carrying conductor, 8... Main circuit current carrying clip,
9...Dolly frame, 10a, 10" 10
b, 10b'La-5** Roller, 11 a, 11
a/,... ... Vertical frame, 12... Transformer for operating circuit, 13... Transformer mounting plate, 14a, 14b.
...Insulating support, 15... Current carrying conductor,
16... U-shaped vertical frame, 17...
··bolt.

Claims (1)

[Scope of utility model registration request] A drawer-type circuit breaker in which a high-voltage contactor, current-limiting power fuse, and operating circuit transformer are attached to a trolley frame and assembled so that they can be moved forward and backward, and are arranged at intervals in the vertical direction. A pair of current-carrying clips, a transformer for operating circuits arranged to be sandwiched between a pair of current-carrying conductors electrically connected to the current-carrying clips, and an upright frame supporting the transformer for operating circuits. and an insulating support fixed to the upper end of the upright frame, and a current-limiting power fuse supported perpendicularly to a current-carrying conductor extending from the insulating support is attached to the front surface of the upright frame. A draw-out type circuit breaker characterized in that an operating circuit transformer is disposed on the back surface of the frame opposite to the current-limiting power fuse mounting surface.