JPH07241023A - Cable termination device - Google Patents

Abstract

PURPOSE:To obtain a cable termination device for enhancing the reliability of operation while improving the workability at the time of withstand voltage test. CONSTITUTION:A cable head 2 connected, at one end thereof, with a power cable 1 is connected, at the other end thereof, with an electric conductor 6 and a fixed contactor 28 is connected at the joint thereof. A movable contactor 23 is supported on a bellows 24 of insulating rubber sheet 24 fixed to a fixing plate 25. When a withstand voltage test is made, an enclosed bolt 26 is removed and the movable contactor 23 is connected with the fixed contactor 28 through operation from the outside of the enclosure.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cable terminal device.

[0002]

2. Description of the Related Art FIG. 5 is a view showing a state in which a conventional cable terminal device and a grounding switch are combined, and FIG. 6 is a cable terminal in which a cable head for applying a test voltage for performing a withstand voltage test is attached. It is a figure which shows an apparatus. In FIG. 5, 1 is a power cable, 2 is a cable head, 3 is a shield for reducing the electric field thereof, 4 is a conductor portion of the cable head 2, 5 is a flange, 6 is an electric conductor, and 7 is a shield for the electric field. Reference numeral 8 accommodates the cable head 2 and the electric conductor 6, and for example, an insulating gas of hexafluorosulfur (hereinafter, S
It is called F ₆ gas. ) Is filled with the container, 9 is a partition made of an electrical insulator that supports the electric conductor 6 and seals SF ₆ gas in the container 8, 10 is a sealing lid, and 11 is a fixing plate to which the cable head 2 is attached. is there. 12 is a movable contact of the earthing switch, 13 is its operating lever, 14 is a fixed contact of the earthing switch, 15 is its electric field mitigation shield, 16 is an electric conductor, 17 is its electric field mitigation shield, and 18 is an electric conductor. A container for accommodating 16 and the movable contactor 12 of the earthing switch and its fixed contactor 14 and filled with SF ₆ gas, 19 for accommodating the movable contactor 12 of the earthing switch and its operating lever 13, and for the container 18 It is a grounded switch container that communicates with the inside.

In such a cable terminal device, a container (not shown) including a disconnector is usually adjacent to the container 18, and the electric conductor 16 is connected to the conductive portion thereof. When the terminal device of this cable is in operation, the movable contact 12 of the grounding switch is in the open position.

Now, when it is necessary to inspect the inside of any of the containers in which the disconnecting switch adjacent to the container 8 and the container 18 is to be inspected, all the connected power supplies are de-energized, and the earthing switch is moved. With the contact 12 in the open position, the electrical conductors 6 and 16, the cable head 2, the power cable 1 and the disconnector are grounded via the movable contact 12 of the earthing switch and its operating lever 13. Then, if the gas filled in the container to be inspected is removed and the predetermined portion such as the sealing lid 10 of the container is removed,
It is possible to inspect the inside. When the inspection work is completed, reseal the specified part of the container, fill it with gas,
When the movable contactor 12 of the earthing switch is placed in the open position, it becomes operable. A shaft (not shown) that rotationally drives the operation lever 13 of the grounding switch is guided to the outside of the container 19 via a rotary sliding seal in the container 19 so that the grounding operation can be performed manually. Has become.

When a cable terminal device is installed on site and a withstand voltage test is performed on the laid power cable 1, both ends of the power cable 1 are electrically opened so that one end of the cable is disconnected. -The disconnecting switch located closer to the head 2 electrically, that is, the disconnecting switch in the container adjacent to the container 18 in which the earthing switch is normally housed, is opened, and the earthing switch is movable contact. Child 12
Is in the open position and grounds the power cable 1, cable head 2, electrical conductor 6, etc. Needless to say, the other end of the power cable 1 is also open. Next, the gas filling the container 8 is released, the sealing lid 10 is removed, and the cable head 21 for applying the test voltage is attached to the container 8 via the fixing plate 22 as shown in FIG. Then, the gas is filled again, the movable contact 12 of the grounding switch is set to the open position, and a predetermined test voltage is applied between the conductor of the power cable 1 and the ground through the cable 20 for applying the test voltage. When this withstand voltage test is completed, the movable contact 12 of the earthing switch is set to the closed pole position to bring it into the earthed state, and then the gas is released, and the cable head 21 for applying the test voltage and its fixing plate.
22 is removed, the sealing lid 10 is attached to the container 8 again, gas is filled, the movable contact 12 of the grounding switch is set to the open position, and the disconnecting switch is opened.

[0006]

In such a cable terminal device, when performing a withstand voltage test of the power cable 1,
Opening of the disconnecting switch closest to this cable terminal device, closing of the movable contact 12 of the grounding switch, degassing of the container 8, removal of the sealing lid 10, and cable head 21 for applying the test voltage. The fixing plate 22 is sealed and attached, the container is filled with gas, the movable contact 12 of the grounding switch is opened, and the power cable 1
Withstanding voltage test, closing of movable contact 12 of earthing switch, degassing of container 8, removal of cable head 21 and its fixing plate 22 for applying test voltage, sealing / attaching of sealing lid 22, container 8 It is necessary to perform complicated operations such as gas filling, opening of the movable contact 12 of the grounding switch, and closing of the disconnector located closest to the cable terminal device. In addition, since the sealing lid 10 of the container 8 is removed and the work is performed inside the container 8 at the site where the cable terminal device is installed, there is a risk of inadvertent mixing of foreign matter, etc. Was sometimes reduced. An object of the present invention is to provide a cable terminal device capable of simplifying work such as performing a withstand voltage test of a power cable and improving operation reliability.

[0007]

In order to achieve the above object, the present invention provides a cable head having one end connected to a power cable, one end connected to another electric conductor on the disconnecting side, and the other end connected to the cable head. The electrical conductor connected to the other end of the container, the container containing the electrical conductor and the cable head, and the inside filled with insulating gas, the fixed contactor connected to the cable head and the electrical conductor, and fixed from the outside of the container The gist of the present invention is that it is composed of a movable contact that can be brought into contact with and separated from the contact.

[0008]

In such a structure, the movable contactor is attached so as to be operable from the outside of the container while maintaining the airtightness of the container, and is operated from the outside when necessary so that the fixed contactor and the movable contactor come into contact with each other. Therefore, the workability at the time of withstanding voltage test can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a sectional view showing an embodiment of the present invention at the time of normal use, and FIG. 2 is an enlarged sectional view of a main part at a withstand voltage test. In these figures, in a state of normal use, a bellows-shaped insulating rubber sheet 24 that supports the movable contact 23 is attached to the fixed plate 25 and is protected by the sealing bolt 26. Bellows insulating rubber sheet
The movable contact 23 is located on the upper side in a contracted state.
When this cable terminal device is installed on site and the container is filled with an insulating medium, for example, SF ₆ gas at a predetermined pressure,
It is ready for operation.

When the operation of the cable terminal device is stopped and the withstand voltage test of the power cable 1 is performed, both ends of the power cable 1 are electrically opened so that the cable head 2 which is one end of the power cable 1 is opened. The closest disconnector electrically connected, ie the container 8 of the cable end device
A disconnecting switch (not shown) built in the adjacent container via the partition wall 9 is opened, and the movable contactor of the grounding switch is closed. The sealing bolt 26 is removed, and the threaded conductor 27 shown in FIG. 2 is attached instead, and the movable contact 23 and the fixed contact 28 are connected. A cable 29 for applying a test voltage is provided with the portion of the conductor 27 with a screw as a terminal.
And a predetermined test voltage is applied between the conductor of the power cable 1 and the ground. At this time, it goes without saying that the other end of the power cable 1 is also opened. When the withstanding voltage test is completed, the cable 29 for applying a test voltage and the threaded conductor 27 connected to the threaded conductor 27 are removed, and the sealing bolt 26 is attached. When the movable contactor of the earthing switch is set to the open position and the disconnector is set to the closed state, the operation becomes possible again. Therefore, the charging / discharging of gas before and after the withstand voltage test of the power cable 1 is performed. Accompanied by repetition. Complicated work can be simplified.

Although the threaded conductor 27 is used in this embodiment, the screw is not always necessary. Further, the space 30 may be filled with gas at the same pressure as the container 8 to eliminate the force exerted on the bellows-shaped insulating rubber sheet 24 by the pressure from the container 8. In this case, it is necessary to form a sealed structure between the fixed plate 25 and the conductor.

Next, another embodiment of the present invention will be described. FIG. 3 shows a normal use state, in which the fixing plate 31 and the sealing lid 32 are attached.
Is attached and the container 8 is sealed. Sealing lid 32
Is covered with a cover 33 to prevent dust.

Now, when the operation of the cable terminal device is stopped and the withstand voltage test of the power cable 1 is performed, the procedure similar to that in FIGS. 1 and 2 is followed, the cover 33 is removed, and the container 34 with a built-in automatic capping device is installed. Attach. This container 34 is a movable contact.
35 is connected by a sliding sealing mechanism 36. After the container 34 with a built-in automatic cap removal device is attached and the inside is evacuated, the same gas as that in the container 8 is filled to the same pressure. After that, the automatic lid removing device built into the container 34 is operated to remove the bolt of the sealing lid 32 and remove the lid, and the lid is moved to a position in the container where no trouble occurs when a voltage is applied. At this point, containers 8 and 34 are an integral container. Then, the movable contact 35 is lowered and connected to the fixed contact 28, and a withstand voltage test is performed. After the test, raise the movable contactor 35 and
The automatic lid removing device 34 is operated to return the sealing lid 32 to its original position, and the lid bolt is tightened. After this, the container 34 is removed and the cover 33 is attached to the original state as shown in FIG. Even in this case, the same effect as that of the above-described embodiment can be obtained.

[0014]

As described above, according to the present invention, one end is connected to the power cable, one end is connected to another electric conductor on the disconnecting side, and the other end is connected to the other end of the cable head. The electric conductor, the container that houses the electric conductor and the cable head, and is filled with insulating gas inside, the fixed contactor that is connected to the cable head and the electric conductor, and the fixed contactor that is separated from the outside of the container. Since the movable contactor is provided, it is possible to improve workability during withstanding voltage test and improve operation reliability.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an example of a cable terminal device of the present invention during normal operation.

FIG. 2 is a diagram for explaining a withstanding voltage test, showing an embodiment of the cable terminal device of the present invention.

FIG. 3 is a diagram for explaining another embodiment of the cable terminal device of the present invention during normal operation.

FIG. 4 is a diagram for explaining another example of the cable terminal device of the present invention during a withstand voltage test.

FIG. 5 is a diagram for explaining a conventional cable terminal device during normal operation.

FIG. 6 is a diagram for explaining a withstand voltage test of a conventional cable terminal device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power cable, 2 ... Cable head, 6 ... Electric conductor, 18 ... Container, 23 ... Movable contactor, 24 ... Bellows-shaped insulating rubber sheet, 25 ... Fixing plate, 26 ... Sealing bolt, 28 ... Fixed contactor.

Claims (3)

[Claims] 1. A cable head having one end connected to a power cable, and one end connected to another electric conductor on a disconnection side,
An electric conductor having the other end connected to the other end of the cable head, a container accommodating the electric conductor and the cable head and filled with an insulating gas, and a fixed contact connected to the cable head and the electric conductor. A cable terminal device having a child and a movable contactor connectable to the fixed contactor from the outside of the container. 2. The movable contactor is attached to a lid plate for maintaining the airtightness of the container via an insulating portion, a test cable is connected to one end outside the container of the movable contactor, and the other end is connected to the movable member. The cable terminal device according to claim 1, wherein the cable terminal device is connected to a fixed contact. 3. A cable head, one end of which is connected to a power cable, and one end of which is connected to another electric conductor on the disconnection side,
An electric conductor having the other end connected to the other end of the cable head, a fixed contact connected to the electric conductor and the cable head, the electric conductor and the cable head are housed, and the inside is filled with an insulating gas. The first container has a first container and a second container provided with a movable contactor and filled with an insulating gas, and the first container while maintaining the airtightness of the second container from the outside of the first container. A cable terminal device, characterized in that the movable contact provided on the second container is connected to the fixed contact.