JP2000114082A - Current transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the width and depth dimensions of a circuit breaker and, in addition, to make the breaker easily attachable and renewable when the breaker becomes defective, by supporting the main body of a central-phase current transformer by the main bodies of both end-phase current transformers, by superposing the front end sections of supporting bodies upon another and inserting insulating bolts into the bolt inserting holes of both superposed front end sections. SOLUTION: Step sections 16 of both end-phase current transformers EC are attached to the attaching plate 12 of a truck 1. The step sections 16 of both insulating supporting bodies 15 of a central-phase current transformer CC are superposed upon the central-side step sections 16 of the transformers EC and aligned with each other, in a state where the top side and front side of the transformer CC are inverted to the bottom side and back side. In addition, the supporting bodies 15 are positioned on the line connecting the centers of the main bodies 9 and 10 of the transformers EC and CC, and the transformer CC is supported by the transformers ED by inserting insulating bolts 18 into the bolt inserting holes 17 of both superposed step sections 16. Finally, the current transformers EC and CC are mounted on the truck 1 of a circuit breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker in which a three-phase circuit breaker main body and an operation device are mounted on a bogie, and more particularly to a current transformer mounted on the circuit breaker. And a current transformer for reducing the depth dimension.

[0002]

2. Description of the Related Art In the respective drawings, the same reference numerals indicate the same or corresponding components. (Conventional Example 1) Conventional Example 1 will be described with reference to FIGS. 1 is a truck of a circuit breaker, 2 is a wheel of the truck 1, 3 is a truck 1
The three-phase circuit breaker body mounted on the main body, 4 is an operating device provided in front of the circuit breaker body 2, 5 and 6 are three-phase upper and lower conductors led out from the circuit breaker body 3 and 7, , 8 are upper contacts provided at the tips of the upper conductor 5, the lower conductor 6,
It is a lower contact.

Reference numeral 9 denotes an end-phase current transformer body provided on both sides behind the circuit breaker main body 3, and 10 denotes a medium-phase current transformer provided on the middle rear side of the both-phase current transformer body 9. A mounting body 11 is formed integrally with each of the current transformer bodies 9 and 10, and each mounting body 11 is mounted on a mounting plate 12 of the truck 1. Current transformer bodies 10 are arranged before and after, and the three-phase lower conductor 6 penetrates each of the current transformer bodies 9 and 10.

Now, the width dimensions of the current transformer bodies 9 and 10 are represented by W ₁ ,
Depth dimension is D ₁ , minimum insulation dimension is W ₂ , conductors 5 and 6
Is W ₃ , the length from the front of the actuator 4 to the front of the wide-phase current transformer body 9 is D ₂ , and the medium-phase current transformer body 10 is
If the length from the rear surface to the rear end of the lower contact 8 is D ₃ , the width of the circuit breaker is W ₀ , and the depth is D ₀ , the following is obtained. W ₀ = 2W ₁ + 2W ₂ + W ₃ D ₀ = 2D ₁ + D ₂ + D ₃

(Conventional Example 2) In FIGS. 7 and 8 showing Conventional Example 2, three-phase current transformer bodies 9 and 10 are arranged in a straight line in a width manner, and the width of the circuit breaker is changed. The dimension W ₀ and the depth dimension D ₀ are as follows. _{W 0 = 3W 1 D 0 =} D 1 + D 2 + D 3

(Conventional Example 3) FIG. 9 and FIG.
In the case of 10, the current transformer body 9 at both ends is located
The medium-phase current transformer main body 10 is disposed above the
In order to support the medium phase current transformer body 10 with a high center position,
Between the breaker body 3 and each of the current transformer bodies 9 and 10, a large
A strong support base 13 is provided, and both sides of the support base 13 are
, And the lower end of the support base 13 is fixed to the carriage 1,
Both sides of the support base 14 rearward from the upper end of the support base 13
Is bent upward, and the medium-phase current transformer main body is
Ten attachment bodies 11 are attached. Above and below
The width W of the circuit breaker ₀, Depth dimension D₀Hatsu
It looks like a fish. W₀= 2W₁+ 2W₂+ W₃ D₀= D₁+ D₂+ D₃

[0007]

SUMMARY OF THE INVENTION Conventional Example 1 and Conventional Example 2
In this case, the current transformer bodies 9 and 10 are attached in comparison with the conventional example 3.
Easy. However, in the case of Conventional Example 1, the width dimension W₀Is
2W₁+ 2W₂+ W₃Is short, but the depth dimension D
₀Is 2D₁+ D₂+ D₃And conventional examples 2 and 3
D₁ + D₂+ D₃Compared to D₁A minute longer
You.

In the case of Conventional Example 2, the depth dimension D ₀ is short as described above, but the width dimension W ₀ is 3W ₁ , which is smaller than 2W ₁ + 2W ₂ + W ₃ of Conventional Examples 1 and _3.
1 > 2W ₂ + W ₃ so long.

Further, in the case of the conventional example 3, the width dimension W ₀ and the depth dimension D ₀ are not longer than those of the conventional examples 1 and 2, but a large, complicated and strong support base 13 is required, and the manufacturing cost is low. It is expensive, has many parts, and is difficult to assemble.

On the other hand, in each of the conventional examples, it is conceivable that the three-phase current transformer bodies 9 and 10 are integrally formed to reduce the number of parts.
Since the weight of the three phases is large, the workability at the time of assembly is poor, and in addition, in the event of a failure, all three phases must be replaced, which increases the cost.

In view of the above, the present invention reduces the width and depth of the circuit breaker when mounted on a trolley of the circuit breaker, and allows easy and inexpensive mounting and replacement in the event of a failure. It is an object of the present invention to provide a current transformer.

[0012]

In order to achieve the above-mentioned object, the present invention is mounted on a truck together with a three-phase circuit breaker main body and an operation device, and a middle phase is disposed above a middle of both end phases. A current transformer, wherein at least one branch-shaped insulating support is protruded from an end-phase current transformer main body, and two branch-shaped insulating support is protruded from a medium-phase current transformer main body. Then, a bolt insertion hole is formed at the tip of each of the supports, the medium-phase current transformer body is superimposed on the current transformer bodies of both ends, and the tip of each of the supports is superposed. Insulating bolts are inserted into the bolt insertion holes to support the bolts.

In the current transformer constructed as described above, the medium-phase current transformer main body is supported via the two medium-phase insulating support bodies by the two-phase current transformer main body insulating support. It is possible,
The large, complicated and strong support base required in the conventional example 3 is unnecessary, and when mounted on a bogie, the width and depth of the circuit breaker are reduced, and one three-phase current transformer is provided. Each mounting reduces the weight and facilitates the assembling work. In addition, when a failure occurs, only the failed current transformer needs to be replaced, and the conversion cost is low.

The present invention also provides a stepped portion at the tip end of each of the insulating supports, and a bolt insertion hole formed at the stepped portion. In this case, the two step portions of the medium phase current transformer main body are turned upside down so as to polymerize.

According to the above configuration, the two insulating supports are positioned by the two step portions to be superimposed, and the medium-phase current transformer main body can be supported on the current transformer main bodies at both ends by one bolt. Regardless of the bolt, it does not rotate, and its supporting work is easy.

Furthermore, in the present invention, two insulating supports are radially protruded from each current transformer main body at a predetermined angle, and both end phases and a middle phase are formed in the same shape.

By making the three current transformers of the two-phase and the medium-phase the same shape, only one mold is required, and the manufacturing cost is significantly reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The two end-phase current transformers EC and the medium-phase current transformers CC are attached to the two end-phase current transformer bodies 9 and the medium-phase current transformer bodies 10, respectively, by two plate-shaped insulating supports 15 respectively.
Are radially projected at a predetermined angle, for example, an angle of about 60 degrees, a square step 16 having a thickness of about 1/2 is formed at the tip of each support 15, and one bolt is provided at the step. The insertion holes 17 are formed, and the current transformers EC and CC of both ends and the middle phase have the same shape.

When mounting the circuit breaker on the trolley 1,
The two-phase current transformers EC are mounted on the mounting plate 12 of the trolley 1 with the step 16 in the same direction, and the medium-phase current transformer CC is turned upside down. Flower CC
Steps 16 of both insulating supports 15 are connected to the current transformers E of both ends.
C is superimposed on the step 16 on the center side of C, aligned with each other, and the respective insulating supports 15 are placed on a line connecting the center points of the current transformer main body 9 of the end phase and the current transformer main body 10 of the middle phase. Insulated bolts 18 are inserted into both bolt insertion holes 17 of both superposed step portions 16, and the current transformers EC of both phases are supported by the current transformers EC of both ends.

At this time, the stepped portion of the two stepped portions 16 that have been superimposed has the functions of positioning vertically and horizontally and preventing rotation.

Next, a steady plate 19 is provided between the upper surface of the circuit breaker main body 3 and the upper surface of the mounting body 11 of the current transformer CC of the middle phase, and the both are connected so that the circuit breaker is operated during operation. Phase current transformer C
The deflection of C is prevented.

In the case of the above-described embodiment, the two-phase current transformer EC
The medium-phase current transformer CC is located above and between the vertices of the triangle.
, The width of the circuit breaker is the same as in Conventional Example 3.
W₀ And depth dimension D₀But, as follows, W₀= 2W₁+ 2W₂+ W₃ D₀= D₁+ D₂+ D₃ And the size of each is reduced, and three current transformers
EC and CC can be handled as a single unit, light weight
It is easier to assemble, and replacement at the time of failure can change.
It is sufficient to replace only the sink, and the replacement cost is low.

Furthermore, the current transformers CC of the middle phase are supported by the respective insulating supports 15 by the current transformers EC of both ends, so that a large, complicated and rigid support base as in the conventional example 3 is not required. .

In addition, since the three current transformers EC and CC have the same shape, only one mold is required, and the manufacturing cost is extremely low.

The steady plate 19 is not necessarily provided if the medium-phase current transformer CC is firmly supported.

A stepped portion 1 is provided at the tip of the insulating support 15.
6 is formed to facilitate positioning and prevent rotation. However, two bolt insertion holes are formed at the tip of the insulating support 15 so that they are connected and supported by two insulating bolts. You may.

Further, three current transformers E of an end phase and a medium phase
C and CC have the same shape, but the end-phase current transformer EC
, Only one insulating support 15 may be protruded.

[0028]

Since the present invention is configured as described above, it has the following effects. Current transformers EC and CC mounted on the bogie 1 together with the three-phase circuit breaker main body 3 and the operating device 4 and having a middle phase disposed above the middle of the terminal phases on both sides. 9, at least one branch-shaped insulating support 15 is protruded, and two branch-shaped insulating supports 15 are protruded from the medium-phase current transformer main body 10. A bolt insertion hole 17 is formed, a medium-phase current transformer body 10 is superimposed on a current transformer body 9 at both ends, and a tip end of each support 15 is superimposed. An insulating bolt is inserted into both superimposed bolt insertion holes 17. By inserting and supporting 18, there is no need for a large, complicated and strong support base as in the past, and when mounted on the trolley 1, the width and depth of the circuit breaker can be reduced. And the three-phase current transformers EC and CC can be installed one by one to reduce the weight and facilitate the assembly work. Replacement during failure al may be a replacement of only the current transformer fault can be made inexpensively conversion costs.

Further, a step 16 and a bolt insertion hole 17 are formed in the tip of each insulating support 15, and the step 16 of the current transformer main body 9 on both sides is formed in the step 16. By inverting the two step portions 16 of the medium-phase current transformer main body 10 upside down, the two insulating supports 15 are positioned by the two step portions 16 to be superimposed, and both ends are respectively set by one bolt. Medium-phase current transformer body 10 is connected to medium-phase current transformer body 9.
Can be supported independently of each other regardless of the bolt, and the supporting operation can be facilitated.

Further, two insulating supports 15 are radially protruded from the current transformer bodies 9 and 10 at a predetermined angle, and both end phases and the middle phase are formed in the same shape. , And the production cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a perspective view of the circuit breaker using FIG.

FIG. 3 is a schematic rear view of FIG. 2;

FIG. 4 is a schematic right side view of FIG. 2;

FIG. 5 is a schematic rear view of the circuit breaker of Conventional Example 1.

FIG. 6 is a schematic right side view of a circuit breaker of Conventional Example 1.

FIG. 7 is a schematic rear view of the circuit breaker of Conventional Example 2.

FIG. 8 is a schematic right side view of a circuit breaker of Conventional Example 2.

FIG. 9 is a schematic rear view of a circuit breaker of Conventional Example 3.

FIG. 10 is a schematic right side view of a circuit breaker of Conventional Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cart 3 Circuit breaker main body 4 Operator 9 End-phase current transformer main body 10 Medium-phase current transformer main body 15 Insulation support 16 Stepped portion 17 Bolt insertion hole 18 Insulation bolt EC End-phase current transformer CC Mid-phase current transformer Current transformer

Claims (3)

[Claims] 1. A current transformer which is mounted on a bogie together with a three-phase circuit breaker main body and an operation device, and in which a middle phase is disposed above a middle of both end phases. At least one branch-shaped insulating support is protruded, and two branch-shaped insulating supports are protruded from the medium-phase current transformer main body, and a bolt insertion hole is formed at the tip of each of the supports. The medium-phase current transformer main body is supported by the two-phase current transformer main body by inserting the insulating bolts into the two bolt insertion holes where the top ends of the respective support members are overlapped. A current transformer characterized in that: 2. The current transformer according to claim 1, wherein a stepped portion is formed at a front end portion of the insulating support, and one bolt insertion hole is formed in the stepped portion. The current transformer, wherein the two step parts of the medium-phase current transformer main body are inverted and superposed on the step part. 3. The current transformer according to claim 1, wherein two insulating supports are radially projected at a predetermined angle on each current transformer main body, and both end phases and the middle phase are the same. A current transformer characterized by being shaped.