JPH07143624A - Switchgear - Google Patents

Abstract

PURPOSE:To easily inspect a current transformer from a front surface side by providing breaker chambers in which breakers can be easily inserted and removed from the front surface, and a cable chamber for containing cables for externally supplying power, and mounting one end of the transformer mounted in the breakers at cables of the cable chambers. CONSTITUTION:Breaker chambers 4a-4c are stacked vertically in a box 1, and breakers 9a-9c are contained freely to be inserted into and removed from front surfaces of the chambers 4a-4c. A cable chamber 16 for externally supplying power is provided at rear sides of the chambers 4a-4c. Phase cables 42 from a bus 6 are connected to lower terminals 11a-11b of the breakers 9a-9c, current transformers 50a-50c are mounted at upper terminals 10a-10c, and connected to the cables 4a-4c of the phases. The front surfaces of the chambers 4a-4c are opened, the breakers 9a-9c are led, and the transformers 50a-50c are inspected. Thus, the inspections of the transformers can be easily conducted from the front surfaces.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a switchgear.

[0002]

2. Description of the Related Art Generally, a current transformer is a device for measuring an electric current of a power receiving and distribution facility or for removing an accident section such as operating a protective relay and tripping a circuit breaker at the time of an accident such as a short circuit.

FIG. 4 is a right side view showing an example of a switch gear of a three feeder circuit incorporating a conventional current transformer. In the figure, a metal box 1 has a front control line room 2 and
Bus room 3 at the upper center, circuit breaker rooms 4a, 4b, 4c located at the bottom of bus room 3 and cable room 16 at the back thereof
It is composed by. In the busbar chamber 3, the busbars 6 supported by the insulators 5 are distributed in three phases and connected to the respective upper conductors 51a, 51b, 51c through the branch conductors 7, 8. Further, the upper terminals 10a, 10b, 10c of the circuit breakers 9a, 9b, 9c respectively correspond to the respective upper conductors 51a, 51a.
It is slidably connected to b and 51c.

On the other hand, the lower terminals 11a, 11b and 11c of the circuit breakers 9a, 9b and 9c have lower conductors 52a, 52b and 5c.
2c is slidably connected to the connecting conductors 12a, 12b, 1
Current transformer 13 fixed on the back base 18 by 2c
a ', 13b', 13c '(total of 6 because two per feeder are arranged in the depth direction from the side surface)
Individual) primary conductors 13a, 13b, 1 passing through the through window 30
3c, and power is supplied to the load by connecting cables 14a, 14b, 14c to the other ends of the primary conductors 13a, 13b, 13c. Cables 14a, 14b,
14c is fixed by cable rackets 15a, 15b, 15c, and three zero-phase current transformers 17 through which such cables penetrate are arranged at the bottom of the cable chamber 16 in the depth direction from the side surface. On the other hand, the current transformers 13a ', 1
As shown in FIGS. 5 (a) and 5 (b), 3b 'and 13c' secure the creepage distance between the ground and the phase by forming the pleats 19.

[0005]

However, with such a switchgear, when inspecting the storage equipment, it is possible to open the circuit breakers 9a, 9b, 9c and then pull them out forward. However, the current transformers 13a ', 13b', 13c 'cannot be inspected from the front because of the rear base 18, and the cable 14
Since there are a, 14b, and 14c, it is difficult to approach from the back side, and it is difficult to inspect. An object of the present invention is to provide a switchgear capable of inspecting a current transformer from the front.

[0006]

In order to achieve the above object, the present invention provides a circuit breaker chamber in which a circuit breaker is housed, and a circuit breaker unit which can be freely put in and taken out of the box from the front side is housed, and an external device. Since the cable chamber that houses the cable for supplying electric power and the current transformer that is attached to the breaking unit in the circuit breaker chamber and has one end connected to the cable in the cable chamber, the breaker unit from the front side. You can check the attached current transformer simply by pulling out.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those in the related art are designated by the same reference numerals and the description thereof will be omitted. 1 is a side view of a switchgear showing an embodiment of the present invention, and FIG. 2 is a current transformer 50a (5) of FIG.
0b and 50c are the same). In these figures, the current transformers 50a, 50b, 50c are fixed to the side surfaces of the circuit breaker units 40a, 40b, 40c through the boss 25, the primary conductor 26 penetrates the through window 27, and the connecting conductors 41a, 41b, 41c. The cable is connected to. Further, the primary conductor 26 includes the circuit breakers 9a, 9b, 9
The upper terminals 10a, 10b, and 10c of FIG. Further, the bus bar 6 and the lower terminals 11a, 11b, 11c of the circuit breakers 9a, 9b, 9c are lower conductors 44a, 44.
b, 44c are slidably connected to the connection conductors 42, 43
It is connected to the bus bar 6 through a, 43b and 43c.

On the other hand, in the current transformer 50a, the current transformer element 20 including the iron core 23 and the low-voltage coil 24 wound around the iron core is arranged at the positions of the first phase and the third phase, and is integrally molded with synthetic resin. Is formed. In addition, the primary conductor 2 of each phase
A through window 27 is provided around 6 to penetrate the primary conductor. Furthermore, a primary conductor fixing boss portion 21 is also provided, and on both sides thereof, the groove 2 is formed in the same surface where the current transformer element 20 is molded.
2 is formed to secure a required creepage distance between the phase and the ground.

As described above, regarding the current transformer 50a,
By molding the two current transformer elements 20 together and forming the groove 22 in the through hole 27 to ensure the required creepage distance, the conventional pleats 19 are unnecessary. Therefore, the current transformer 50a becomes compact, and thus can be mounted on the circuit breaker unit 40a that is housed in the circuit breaker chamber of the switch gear. Therefore, when inspecting the current transformer 50a, the current transformer 5
It is sufficient to pull out the circuit breaker unit 40a to which 0a is attached from the front side, and the inspection can be easily performed from the front side.

Next, the matters relating to the current transformer 50a will be described. Since the conventional current transformer 13a 'has a single phase, the number of fastening parts is large, and it takes time to adjust the vertical and horizontal dimensions when fixing to the rear base 18 of the switch gear. However, in the current transformer 50a according to the present embodiment, since the two current transformer elements are integrally molded, the number of fastening parts is reduced, and the dimensional adjustment can be easily performed. Further, the cost is reduced due to the reduction of fastening parts.

Further, since the conventional current transformer 13a 'has the folds 19 formed therein, the outer dimensions are large, and as a result, the size of the switch gear is increased. However, the current transformer 50a according to the present embodiment is compact because two current transformer elements are integrally molded.
As a result, the switchgear becomes compact.

As for the current transformers 50b and 50c,
Similar effects can be obtained as compared with the conventional current transformers 13b and 13c. On the other hand, in another embodiment of the present invention, when the three-phase current is measured by three pieces, it is sufficient to arrange three pieces of the current transformer elements with a necessary insulation dimension as shown in FIG. 3 and integrally mold them. . As a result, the same effects as those described above can be obtained.

[0013]

As described above, according to the present invention, a circuit breaker chamber in which a circuit breaker is housed and a circuit breaker unit that can be freely inserted and removed from the front side is housed, and a cable for supplying electric power to external equipment. Since it is composed of a cable chamber in which is stored and a current transformer which is attached to the breaking unit of the circuit breaker chamber and one end of which is connected to the cable in the cable chamber, the current transformer can be inspected from the front side.

[Brief description of drawings]

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

FIG. 2 is an external view showing an embodiment of the current transformer 50a of FIG.

FIG. 3 is an outline view showing another embodiment of the current transformer 50a of FIG.

FIG. 4 is a side view of a conventional switchgear.

FIG. 5 is an external view of the current transformer 13a ′ of FIG.

[Explanation of symbols]

4a, 4b, 4c ... Circuit breaker room, 16 ... Cable room, 40
a, 40b, 40c ... Circuit breaker unit, 50a, 50
b, 50c ... Current transformer.

Claims (2)

[Claims] 1. A circuit breaker chamber for accommodating a circuit breaker, which accommodates a circuit breaker unit that can be inserted into and removed from the box from the front side, a cable chamber for accommodating a cable for supplying electric power to an external device, and the circuit breaker. A switchgear having a current transformer attached to a shutoff unit in the chamber and having one end connected to the cable in the cable chamber. 2. The current transformer comprises a plurality of transformers each having an iron core, a low voltage coil wound around the iron core, and a through window having a groove penetrating a primary conductor, one end of which is connected to the cable. The switchgear according to claim 1, wherein the flow element is integrally molded.