JP2955103B2 - Cable head for device connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable head for connecting equipment between a cable line and equipment.

[0002]

2. Description of the Related Art When high-voltage devices such as GIS (gas-insulated circuit breakers) are connected to each other by cable lines, the following configuration is generally employed. FIG. 4 shows a side view of a conventional device and a cable head for device connection. In the figure, a device 1 is, for example, a high-voltage device such as the GIS described above, and a cable line 4 is connected to a wall surface 2 of the device 1 via a bushing 3. An internal device 5 of the device 1 is electrically connected to the bushing 3 via a bus 6. The inside of the device 1 is insulated by an insulating gas 7 such as sulfur hexafluoride. When installing such equipment, the equipment 1
In addition to the electrical test of the cable and the cable line 4, it is necessary to conduct an electrical test of the entire device after the installation of the bushing 3 and the like is completed. In this case, a so-called AC withstand voltage test or the like in which an AC voltage for testing is applied through the cable line 4 is performed.

[0003]

Generally, the cable line 4 has an extremely large capacitance as compared with the equipment 1 or the like. Therefore, the so-called DC withstand voltage test in which a high DC voltage is applied can more accurately grasp the electrical characteristics of the cable line 4. However, when the DC withstand voltage test is performed after the cable line 4 is connected to the device 1, the following problem occurs. That is, the insulating gas 7 is provided inside the device 1.
, But a considerable amount of dust is floating in the insulating gas 7. Therefore, the bus 6 through the cable line 4
When a high DC voltage is applied to the device, dust is intensively adhered to the inside of the device according to the principle of a so-called electric precipitator. Therefore,
As a result, the insulation performance may be reduced.
For this reason, there has conventionally been a problem that it is difficult to perform a DC withstand voltage test on the cable line 4 after the cable line 4 is attached to the device 1. The present invention has been made by paying attention to the above points, and is a device connection cable that enables a DC withstand voltage test of a cable line connected to a device while preventing a DC voltage from being applied to the inside of the device. It is intended to provide a head.

[0004]

A cable head for connecting a device according to the present invention is mounted on a wall surface of a device having an internal circuit.
Bushing, embedded in the bushing and
A conductor extraction rod electrically connected to an internal circuit;
Cable for supplying power to the internal circuit
Cable connection terminal to which the end of the
The test cable is installed on the bushing and connected to the cable line.
The end of the power application cable for applying
Power terminal and the cable embedded in the bushing.
Cable connection terminal and the internal power to which the power application terminal is electrically connected.
Pole, the conductor extraction rod of the bushing, and the internal
The first pivoting position is provided so as to be pivotally operable between the pole and the first pivoting position.
A conductive peripheral surface that contacts the conductor extraction rod and the internal electrode;
And at the second rotation position, the conductor withdrawal rod and the internal electrode
Cylindrical electrical connection member having an insulating peripheral surface that comes into contact with
And characterized in that:

[0005]

[Function] Cable connecting cable line to bushing
A connection terminal and a power application terminal for connecting the power application cable are provided.
And buried internal electrodes to which these terminals are electrically connected.
I do. Also, the bushing is connected to the internal circuit of the device
Provide a conductor extraction rod, and electrically connect it to the internal electrode.
Prepare cylindrical electrical connection members for connection and disconnection
You. Depending on the rotational position of the electrical connection member, a conductor extraction rod
Conductive and insulative surfaces that are in contact with the
A surface is provided. This makes it possible to connect the conductor
The electrical connection between the electrode and the
A DC test voltage is applied only to the bull line.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a cable head for device connection according to the present invention, and (a) is a longitudinal sectional view thereof. Also,
(B) is a sectional view of the electric connection member along the line AA, (c).
Is a perspective view of the right end thereof. In the figure, a bushing 11 is fixed to a wall surface 2 of a device via a fixing bolt 12. One end on the left side of the bushing 11 penetrates a through hole 2A provided in the wall surface 2 of the device and protrudes into the device. Also, inside the bushing 11,
A conductor extraction rod 13 connected to the internal circuit of the device is provided. Further, at the center of the bushing 11,
An internal electrode 14 for making an electrical connection with the cable line 20 and the power application cable 30 is arranged.

Below the bushing 11, a cable connection terminal A for receiving the end of the cable line 20 is provided.
Is provided. Also, on the right side of the bushing 11,
A power application terminal B for receiving the end of a power application cable 30 for applying a test voltage to the cable line 20 via the bushing 11 is provided. Cable track 20
Is fixed to the cable connection terminal A of the bushing 11 using the protection case 21, and the power application cable 30 is fixed to the power application terminal B of the bushing 11 using the protection case 31. On the insulators of the cable line 20 and the power application cable 30, stress cones 22, 32 for insulation reinforcement are respectively fitted. Both conductors 23, 3
Reference numeral 3 denotes an internal electrode 14 through wedge-shaped terminals 24 and 34.
Connected and fixed. The cable termination configuration of the cable line 20 and the power application cable 30 is the same as the termination configuration of the conventional general high-voltage cable, and further detailed description is omitted.

Here, in the cable head for device connection of the present invention, the conductor lead rod 13 of the bushing 11 is used.
A cylindrical hollow portion 10 is provided between the inner electrode 14 and the inner electrode 14. An electric connection member 15 whose cross section is shown in FIG. 1B is fitted into the hollow portion 10. As shown in (b), the electric connection member 15 includes a cylindrical insulating portion 15B made of epoxy resin or the like and the conductor portion 1 integrated therewith.
5A. In addition, this is the same as the hollow portion 1 as a whole.
It is composed of a shape corresponding to 0. The electrical connection member 1
The fifth conductor portion 15A is made of, for example, a copper rod, and forms a conductive peripheral surface along a longitudinal direction on a part of the electric connection member 15.
ing.

On the other hand, the conductor extraction rod 13 has an overhang 13A extending to a portion facing the conductor 15A of the electric connection member 15. A contact 13B for electrical connection is arranged on the inner surface of the overhang 13A. The contact 13 </ b> B is connected to the conductor 1 of the electrical connection member 15.
When it comes into contact with 5A, it is formed of a spring-like conductor for keeping the electric resistance between the two sufficiently low. Similarly, the internal electrode 14 is provided with a protruding portion 14A extending in the direction of the conductor extraction rod 13. The projecting portion 13 of the conductor lead rod 13 is also provided on the inner surface of the projecting portion 14A.
A contact 14B similar to that provided in A is provided. The overhanging portion 13A of the conductor extraction rod 13 and the internal electrode 14
When the electric connection member 15 is rotated by 180 ° from the state shown in the drawing, the conductor portion 15A is electrically connected to the overhang portion 14A.

In this state, as shown in FIG. 1B, the conductor 15A is located on the opposite side of the overhang 14A, and the electrical insulation between the conductor lead rod 13 and the internal electrode 14 is maintained. I have. Further, as shown in (c), a rib 15C is provided at the right end portion of the electric connection member 15,
The electric connection member 15 is grasped by the arrow 15 by grasping the rib 15C.
It is configured to be able to rotate in the direction of D. When the power supply cable 30 is detached from the power supply terminal B of the bushing 11, the rib 15C is used to insert an operation rod or the like from the outside and grasp it. In addition, the cable for power application 3
1, the terminal 34 is inserted into the through-hole of the internal electrode 14 so as to be removable therefrom, as shown in FIG. The terminal 34 is provided with a contact 36A similar to the overhang portion 14A. Therefore, by inserting the terminal portion of the power application cable 30 into the through-hole of the internal electrode 14, the electrical connection with the internal electrode 14 is completed.

FIG. 2 shows a longitudinal sectional view of the bushing in a normal use state after the DC withstand voltage test as described above has been completed. In a normal use state, when the power application cable 30 is not attached, the blind plug 40 is fitted into the power application terminal B as shown in the figure. A stopper 41 is provided on the high pressure side of the blind plug 40.
Is provided, and an electrode plate 42 is provided on the low pressure side,
Other portions are made of insulating rubber 43. The power application terminal B is hermetically sealed by the lid 46 and the bolt 45. A spring 44 is inserted between the electrode plate 42 and the flange 47 fixed to the inner surface of the lid 46, and the spring 44 presses the blind plug 40 against the inner wall surface of the power application terminal B of the bushing 11. . At this time, the electric connection member 15 is rotated by 180 ° from the state shown in FIG. 1, and as shown in (b), the conductor lead bar 13 and the internal electrode 14 are electrically connected via the conductor portion 15A.

The cable head for device connection of the present invention having the above configuration is used as follows. FIG. 3 is an explanatory view of the operation in a state where the cable head for device connection of the present invention is used. (A) of the figure is an operation explanatory diagram at the time of a DC withstand voltage test,
(B) is an operation explanatory diagram in a normal use state. In the figure, the cable for power distribution 3
When a DC high voltage is applied using 0 to perform a DC withstand voltage test, the power application cable 30 is attached to the power application terminal B as shown in FIG. Further, the cable line 20 is mounted as shown in FIG. Then, the electric connection member 15 is rotated in the bushing 11 in a state as shown in FIG. As a result, a high DC voltage is applied from the power application cable 30 to the cable line 20 as shown in FIG. On the other hand, a high DC voltage is cut off by the insulating portion 15B with respect to the conductor extraction rod 13, and no DC high voltage is applied to the inside of the device.

On the other hand, after the completion of the DC withstand voltage test, the electric connection member 15 is rotated by 180 °. Then, the blind plug 40 as shown in FIG. Thereby, the cable line 20 and the conductor lead-out bar 13 are electrically connected via the conductor of the electric connection member 15. Therefore, normal use as described above with reference to FIG. 3 becomes possible. The present invention is not limited to the above embodiments. When the cable connection terminals and the power application terminals are provided on the bushing, their positions and numbers may be arbitrary. In addition, the shape and the like of the conductor extraction rod and the electrical connection member may be freely changed within a range that achieves the above object.

[0014]

The cable head for device connection according to the present invention described above has a conductor extraction rod inside the bushing.
An electrical connection member for electrically connecting and disconnecting between the internal electrodes is provided, during voltage application a voltage test cable line by using a voltage application cable, inner conductor drawing rod the electric connection member is rotated Since the electrical connection between the electrodes is cut off, a DC withstand voltage test of the cable line can be performed without applying a high DC voltage to the device. As a result, during the DC withstand voltage test of the cable line, a DC high voltage is applied inside the equipment,
It is possible to prevent dust from adhering to the inner wall or the like of the device.

[Brief description of the drawings]

1A and 1B show an embodiment of a cable head for device connection according to the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is a sectional view of an electrical connecting member, and FIG.

FIGS. 2A and 2B are vertical sectional views of a cable head for device connection according to the present invention during normal use, in which FIG. 2A is a longitudinal sectional view and FIG.

FIG. 3 is an explanatory view of the operation of the cable head for device connection of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional general device and a cable head.

[Explanation of symbols]

 2 Wall surface of device 10 Hollow part 11 Bushing 15 Electrical connection member 15A Conductor part 15B Insulation part 20 Cable line 30 Power supply cable A Cable connection terminal B Power supply terminal

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Ryoichi Kojima 2-1-1, Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (56) References JP-A-52-146842 (JP, A (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02G 15/00-15/196

Claims (1)

(57) [Claims] 1. Mounting on a wall of a device having an internal circuit
And a bushing embedded in the bushing and electrically connected to the internal circuit.
A conductor pull-out rod, which is provided in the bushing and is used to energize the internal circuit.
Connection to attach cable line termination for
Terminal and provided on the bushing for testing to the cable line
Termination of power supply cable for applying voltage
Power supply terminal, the cable connection terminal embedded in the bushing and
An internal electrode to which the power-carrying terminal is electrically connected, and a conductor extraction rod of the bushing and the internal electrode.
The conductor is arranged to be rotatable between the conductors in a first rotational position.
A conductive peripheral surface in contact with the extraction rod and the internal electrode;
Contacts the conductor extraction rod and the internal electrode at the rotation position of
A cylindrical electrical connection member having an insulating peripheral surface
Cable head for connecting devices.