JP2921537B2 - 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 individually performing an electrical test on the cable and the cable line 4, it is necessary to perform an electrical test on the entire apparatus after the installation of the bushing 3 and the like is completed. In this case, cable line 4
A so-called alternating current (AC) withstand voltage test or the like is performed in which an AC voltage for testing is applied through the test.

[0003]

Generally, the cable line 4 has an extremely large capacitance as compared with the equipment 1 or the like. Therefore, the so-called direct current (DC) withstand voltage test, in which a high DC voltage is applied, can more accurately capture 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 inside of the device 1 is filled with the insulating gas 7, and a considerable amount of dust floats in the insulating gas 7. Therefore, when a high DC voltage is applied to the bus 6 or the like through the cable line 4, dust is intensively adhered to the inside of the device by the so-called electric precipitator principle. Therefore, there is a possibility that 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]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for electrically connecting a device.
Cable to accept the end of the cable line to be connected
Test voltage to the cable connection end and the cable line.
Power receiving end to accept the end of the power charging cable
Electrical connection between the cable connection end and the power application end
Internal electrode, and is electrically connected to the internal circuit of the device
A conductor drawing rod, the cable connection end and the power receiving end
Housing the portion, the internal electrode, and the conductor lead bar,
A bushing attached to a wall of the device;
A hollow portion provided between the body pull-out bar and the internal electrode
When it is fitted into the
Electrical connection between the pole and removed from the hollow part
Electrical connection between the conductor extraction rod and the internal electrode.
An electrical connection member for interrupting connection to the bushing.
Is in the hollow portion from which the electrical connection member is removed,
Pipes and valves for introducing insulating gas from equipment are provided
The present invention relates to a cable head for device connection.

[0005]

The cable head is provided with a cable connection end A for connecting the cable line 20 and a power application end B for connecting the power application cable 30. In addition, a conductor pull-out bar 13 connected to the internal circuit of the device is provided in the bushing 11, and an electrical connection member 15 for electrically connecting the conductor pull-out bar 13 to the cable connection end A is disposed in the bushing 11 so as to be able to be inserted and withdrawn.
At the time of the DC withstand voltage test of the cable line 20, the insulating gas 16 is introduced from the inside of the device into a space created by extracting the electric connection member 15. As a result, the electrical connection between the conductor extraction rod 13 and the cable connection end A is electrically disconnected, and a DC test voltage is applied only to the cable line 20. If the insulating gas 16 is taken in from the inside of the device via a valve, the necessary minimum amount can be used.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described 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. FIG. 2B is a longitudinal sectional view of the cable head before the electric connection member 15 is mounted. In the figure, the wall surface 2 of the device
, A bushing 11 is fixed via fixing bolts 12. In the figure, 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. Further, inside the bushing 11, a conductor lead bar 13 connected to an internal circuit of the device is provided. Further, at the center of the bushing 11, an internal electrode 14 for making an electrical connection to a cable line or a power application cable described later is arranged. The internal electrode 14 has a through hole 14a at the upper end.

Below the bushing 11, FIG.
A cable connection end A for receiving the end of the cable line 20 described with reference to FIG. On the right side of the bushing 11, a power application cable 30 for applying a test voltage to the cable line 20 via the bushing 11.
Power receiving end B for receiving the termination of the power supply. The power application cable 30 is fixed to the power application end B of the bushing 11 using a protective case 31. A stress cone 32 is fitted on the insulator of the power supply cable 30 for insulation reinforcement. The cable terminal configuration of the power application cable 30 is the same as the conventional terminal configuration of a 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 tapered hollow portion 10 is provided between the inner electrode 14 and the inner electrode 14. An electric connection member 15 as shown in FIG. 1B is fitted into the hollow portion 10. As shown in FIG. 1B, the electric connection member 15 has a small diameter portion on the left side and a large diameter portion on the right side in the drawing. This electric connection member 15
The small-diameter portion and the large-diameter portion are formed by a spring-shaped contact 15A.
Are provided respectively. This electric connection member 15
As shown in FIG. 2, when fitted into the hollow portion 10 of the bushing 11, the contact 15A provided in the small diameter portion is fitted into the concave portion of the conductor lead bar 13 and makes electrical contact. In addition, the contact 15 provided on the large diameter portion of the electrical connection member 15
A is in electrical contact with the inner wall surface of the through hole 14a of the internal electrode 14. Thereby, the conductor extraction rod 13 and the internal electrode 1
4 is secured.

The fitted electric connection member 15 is a fixing fitting 1.
Fixed at 7. The fixing bracket 17 is formed of a lid screwed into the through hole 14a of the internal electrode 14. In this case, the power application end B is fitted with the blind plug 40 and is sealed by the lid 46. During such work, the valve 19 shown in FIG. 1 is closed to prevent the insulating gas from flowing out of the device.

On the other hand, as shown in FIG. 1A, when the power application cable 30 is attached to the power application end B, the insulating gas 16 is injected into the hollow portion 10 of the bushing 11. The insulating gas 16 is, for example, sulfur hexafluoride and is introduced into the hollow portion 10 via a pipe 18 and a valve 19 attached to the wall surface 2 of the device. That is, no special tank or gas equipment is used to inject the insulating gas 16, and the insulating gas already used for insulation inside the device is used as it is. When the hollow portion 10 is filled with the insulating gas 16 in this manner, even when a high DC voltage is applied to the internal electrode 14, creeping short-circuiting on the inner wall surface 10A of the hollow portion 10 is prevented, and dielectric breakdown is prevented from occurring. be able to. That is, by filling the insulating gas 16 into the hollow portion 10 at a predetermined pressure,
Constant withstand voltage characteristics can be obtained.

FIG. 1 shows a terminal portion of the power application cable 30.
As shown in (a), a plug 36 is attached to a conductor 34 that is peeled off from the insulator 33 and that can be easily electrically connected by insertion. A contact 36 </ b> A is provided on the outer periphery of the plug 36, similarly to the electrical connection member 15. Therefore, by inserting the power application cable 30 into the through hole 14a of the internal electrode 14, the plug 36
And the electrical connection with the internal electrode 14 is completed.
Note that a tulip contact 21 for receiving the terminal end of the cable line 20 and making an electrical connection therewith is provided below the internal electrode 14.

FIG. 2 shows a longitudinal sectional view of the bushing in a normal use state after the above-described DC withstand voltage test is completed. As shown, the cable connection end A of the bushing 11
, An end 24 connected to the conductor of the cable line 20 is inserted, and an electric connection with the internal electrode 14 is made by a tulip contact 21. The cable line 20 is fixed to the lower end of the bushing 11 by a protective case 23, and a stress cone 22 is fitted on the insulator for insulation reinforcement. The other cable termination structure is the same as the power application cable 30 and does not differ from the configuration generally used in the past.

On the other hand, when the power application cable 30 is not attached, a blind plug 40 is fitted to the power application end B as shown in FIG. Electrode plates 41 and 42 are provided on the high-pressure side and the low-pressure side of the blind plug 40, respectively, and the other parts are made of insulating rubber 43. The power application end B is hermetically sealed by the lid 46 and the bolt 45. A spring 44 is inserted between the cover 46 and the concave portion of the electrode plate 42, and the spring 44 presses the blind plug 40 against the tapered inner wall surface of the power receiving end B of the bushing 11. In this state, the electrical connection member 15 described above with reference to FIG. 1B is fitted into the tapered hollow portion 10 of the bushing 11.

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. FIG. 3A is an operation explanatory diagram at the time of a DC withstand voltage test, and FIG. 3B is an operation explanatory diagram in a normal use state.
In FIG. 3A, when a DC high voltage is applied to the cable line 20 using the power application cable 30 to perform a DC withstand voltage test, as shown in FIG. The power application cable 30 is attached to the power application end B. Further, the cable line 20 is mounted as shown in FIG. Then, the hollow portion 10 of the bushing 11 is filled with the insulating gas 16 by opening the valve 19. In this state, a high DC voltage is applied from the power application cable 30 to the cable line 20. On the other hand, for the conductor extraction rod 13,
The DC high voltage is cut off by the insulating gas 16 and the DC high voltage is not applied to the inside of the device.

On the other hand, after the DC withstand voltage test is completed, the valve 19
Is closed, and the electric connection member 15 is fitted into the hollow portion 10 as shown in FIG. Then, the blind plug 40 is attached. As a result, the cable line 20 and the conductor extraction rod 1
3 is electrically connected via an electric connection member 15. Therefore, normal use as described above with reference to FIG. 2 becomes possible.

The present invention is not limited to the above embodiment. When the cable connection end A and the power application end B are provided on the bushing 11, the positions and numbers thereof may be arbitrary. Also,
The shape and the like of the conductor extraction rod 13 and the electric connection member 15 may be freely changed as long as the above object is achieved . Izu
In this case , the cable is not
Any configuration may be used as long as the insulating gas 16 can be injected into the cut portion of the circuit so that the C voltage is not applied.

[0017] Even in the use state of the equipment in which the cable line and the equipment are electrically connected, it is preferable to secure the electrical insulation of that part. For this purpose, it is preferable to open the valve again after the start of use of the device, so that an insulating gas is introduced around the electric connection member.

[0018]

As described above, according to the cable head for device connection of the present invention, an electric connection member for electrically connecting between the conductor draw-out rod and the cable connection end is provided inside the bushing, and the power supply cable is provided. During the application of the test voltage to the cable line using, the circuit was cut by removing the electrical connection members, etc., so that the insulating gas was filled in the cut section of the circuit, so a high DC voltage was applied to the equipment. A DC withstand voltage test of the cable line can be performed without performing. As a result, during the DC withstand voltage test of the cable line,
DC high voltage is applied inside the device, and there is no danger of dust adhering to the inner wall of the device. In addition, since the insulating gas is introduced into the bushing from the inside of the equipment via a valve, equipment such as a gas cylinder is not required, and the test can be performed using the minimum necessary insulating gas. It has an excellent effect in terms of economy. In addition, by checking and cleaning the hollow portion of the bushing 11 at the time of attaching and detaching the electric connection member, it is possible to maintain high electric characteristics and further enhance reliability.

[Brief description of the drawings]

1A and 1B show an embodiment of a cable head for device connection according to the present invention, in which FIG. 1A is a longitudinal sectional view thereof, and FIG. is there.

FIG. 2 is a longitudinal sectional view of the cable head for device connection of the present invention at the time of normal use.

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 16 Insulating gas 20 Cable line 30 Power supply cable A Cable connection end B Power reception end

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Nobuyuki Sema 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Cable Co., Ltd. (56) References JP-A-4-347520 (JP, A) JP-A-4-347521 (JP, A) JP-A-5-95619 (JP, A) JP-A-5-191916 (JP, A) JP-A-59-117119 (JP, U) JP-A-2-49320 (JP, U) JP 55-31684 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 15/00-15/196

Claims (1)

(57) [Claims] An end of a cable line electrically connected to equipment.
A cable connection end for receiving the end, and a power supply cable for applying a test voltage to the cable line
Power receiving end for receiving the end of the cable, and electrically connecting the cable connection end and the power receiving end
An internal electrode and a conductor extraction rod electrically connected to an internal circuit of the device
And the cable connection end, the power application end, and the internal electrode.
The conductor drawer rod is housed and housed on the wall of the equipment.
And a bushing to be attached , provided between the conductor extraction rod and the internal electrode.
When fitted in the hollow portion, the conductor drawer rod and the
Electrical connection between internal electrodes and removal from the hollow part
The electrical connection between the conductor extraction rod and the internal electrode
An electrical connection member for interrupting the air connection, wherein the bushing has a configuration in which the electrical connection member is removed.
A pipe for introducing an insulating gas from the device into the hollow portion
Equipment connection cable characterized by having a valve and a valve
head.