JPH0751784Y2 - Primary outlet device of current transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a primary outlet device of a current transformer for measuring a current of a power cable.

[Conventional technology]

Conventionally, as a primary outlet device of this type of current transformer,
There is one disclosed in Japanese Patent No. 78914, which will be described with reference to FIGS. 3 and 4. In the figures, a primary outlet conductor (1) is attached to an insulator (2) to form a mounting seat (3) made of steel material. It is insulated. The tightening seat (4) fixes the insulator (2) with bolts (5). An oil-tight gasket (6) is provided between the insulator (2) and the mounting seat (3) and the tightening seat (4).
Has been inserted. The oil-tight gaskets (7) inserted into both ends of the insulator (2) are compressed and held by a stop nut (8), a seat nut (9) and a presser seat (10). The primary conductor (11) in oil of the current transformer is fixed by a nut (12) with a seat and a nut (13). The primary terminal gold (14) in the air is fixed by a nut (15) with a seat and a nut (16).

With the above configuration, the current from the power cable flows to the primary conductor (11) through the primary terminal metal (14), the primary outlet conductor (1). Further, there is a pressure difference between the oil side and the air side, and the oil tightness is maintained by the gaskets (6) and (7).

These gaskets (6), (7) are seated nuts (9),
(12) Compressed by the tightening force of the stop nuts (8) and (13), the oil tightness is maintained. On the other hand, a nut with a seat (15),
The stop nut (16) is for mounting the primary terminal metal (14), and is not involved in the oil tightness effect of the gaskets (6), (7).

[Problems to be solved by the invention]

Since the primary outlet device of the conventional current transformer is configured as described above, when removing the primary terminal metal (14) at the time of relocation or replacement of the power cable, the nut with seat (15), It is necessary to loosen and remove the stop nut (16), at which time the primary outlet conductor (1) is also rotated, which breaks the oil tightness of the gaskets (6), (7) and absorbs moisture in the air. There was a problem.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a primary outlet device for a current transformer that prevents co-rotation of the primary outlet conductor and prevents oil-tightness breakage of a gasket. To aim.

[Means for solving problems]

In the primary outlet device of the current transformer according to the present invention, a rectangular locking portion is provided near the root of the screw portion on one end side of the primary outlet conductor, and the side surface of the rectangular locking portion is closely contacted. The insulating stopper is fixed to the mounting seat.

[Action]

In this invention, since the side of the rectangular locking portion provided on the primary output conductor and the insulating stopper are in close contact with each other, they act on the primary output conductor when removing the primary terminal metal. The rotational force is received by the insulating stopper that engages with the locking portion, and the primary outlet conductor does not rotate together.

〔Example〕

1 and 2 show an embodiment of the present invention, in which the primary outlet conductor (1) is provided with a quadrangular locking portion (1a) near the root of the thread portion on the oil side. It is provided so as to project in a direction orthogonal to the axial direction of the conductor. Then, the insulating stopper (20) for preventing co-rotation of the primary outlet conductor (1) is firmly attached with the bolt (21) so that the insulating stopper (20) comes into close contact with the two opposite sides of the locking portion (1a), respectively. It is fixed to 3).

In addition, the same reference numerals as those in FIGS. 3 and 4 are the same parts.

With the above configuration, the assembly method is the same as the conventional one, but the insulating stopper (20) having strength and insulation is brought into close contact with the side of the locking portion (1a) of the primary outlet conductor (1) to attach the seat ( Since it is fixed to 3), the rotational force that acts on the primary outlet conductor (1) when loosening the seat nut (15) and the lock nut (16) is via the side of the locking part (1a). Insulation stopper (20)
Be accepted by. Therefore, even if the seat nut (15) and the lock nut (16) are loosened when the primary terminal metal (14) is removed, co-rotation of the primary outlet conductor (1) is prevented, and the oil-tight gasket ( The quality of the current transformer is improved without affecting 6) and (7).

In addition, in the said Example, although the primary outlet device of a current transformer was demonstrated, it may be a primary outlet device in a transformer etc., and the same effect is produced.

[Effect of device]

As described above, according to the present invention, a rectangular locking portion is provided near the root of the threaded portion on one end side of the primary outlet conductor, and the insulating stopper is provided so as to be in close contact with the side of the rectangular locking portion. Since the structure is fixed to the mounting seat and the side of the rectangular locking portion and the insulating stopper are engaged, the primary outlet conductor does not rotate together. Therefore, the quality of the current transformer can be improved. Further, there is also an effect that the work for removing the primary terminal metal can be performed easily without paying attention to the co-rotation of the primary outlet conductor.

[Brief description of drawings]

1 and 2 are a side sectional view and a front view of an embodiment of the present invention, and FIGS. 3 and 4 are a side sectional view and a front view of a conventional current transformer primary outlet device. (1) …… Primary outlet conductor, (1a) …… Locking part, (2)…
… Insulator, (3) …… Mounting seat, (4) …… Tightening seat,
(6), (7) …… Gasket, (8), (13), (1
6) ...... stop nut, (9), (12), (15) ... nut with seat, (10) ... holding seat, (11) ... primary conductor, (14)
...... Primary terminal gold, (20) …… Insulation stopper. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A screw portion is threaded on both ends, and
A square locking portion is provided near the root of the threaded portion on one end side, and the locking portion is located in the oil through an insulator on a mounting seat fixed at the boundary between air and oil. As described above, the primary outlet conductor that is disposed so as to penetrate from the air to the oil, and the air that is tightened and fixed to the threaded portions at both ends of the primary outlet conductor by a seat nut and a stop nut. And a primary terminal metal and a primary conductor respectively disposed in oil, a gasket inserted between the insulator and the mounting seat and at both ends of the insulator, and a side of the locking portion of the primary outlet conductor. Primary outlet device of the current transformer, which comprises an insulating stopper fixed to the mounting seat in close contact with the mounting seat.