JP2813786B2 - Cable head for device connection and how to use it - 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 and a method of using the same.

[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 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 an object of the present invention to provide a head and a method of using the same.

[0004]

SUMMARY OF THE INVENTION The present invention provides a bushing mounted on a wall of an apparatus and a bushing provided in the bushing.
Conductor drawer that is electrically connected to the internal circuit of the device
A rod and power applied to the internal circuit disposed in the bushing
An internal electrode to which a cable line for connecting is electrically connected;
For applying a DC test voltage to the cable line
Said bushing end to attach the cable end
Equipment connection cable head with an opening provided in
And the conductor pull-out bar in the bushing.
Formed in communication with the opening between the internal electrode
Hollow part, replaceable via the opening to the hollow part
An electrical connection between the conductor extraction rod and the internal electrode.
The connection conductor for applying power to the following equipment and the test voltage are applied.
The connection to the hollow through the opening
The conductor is arranged in place of the conductor, and the conductor drawer rod and the inner
An insulator for interrupting electrical connection with the electrode;
The end of the cable is electrically connected to the internal electrode and
It is characterized by being attached to the opening.

Another invention is mounted on a wall of an apparatus.
A bushing, and a bushing;
A conductor pull-out rod electrically connected to the external circuit;
Cable for powering the internal circuit
An internal electrode to which the cable line is electrically connected;
To the DC test voltage
An opening provided at the end of the bushing for mounting
Of using a cable head for device connection with a
The conductor pull-out bar in the bushing and
Forming a hollow portion communicating with the opening between the first electrode and the second electrode;
Connection conductor can be exchanged through the opening in the hollow part
And electrically connect the conductor extraction rod to the internal electrode.
When applying the test voltage, the insulator is
Replaced with the connection conductor through the portion and arranged in the hollow portion, the
Cut off the electrical connection between the conductor extraction rod and the internal electrode
At the same time, the terminal of the power application cable is connected to the internal electrode.
It is characterized in that it is connected to the opening by air connection.

[0006]

[Function] Electrical connection of cable line to bushing
<br/> rod provided out can conductor pull is connected to the internal circuit parts electrode and equipment, for electrically connecting between them, connected to the hollow section guide
Position the body . In the case of DC power test of cable line,
Replace the insulator with the connecting conductor through the bushing opening
Into the hollow part. Thus, the conductor drawing rod and the inner
The electrical connection with the external electrodes is electrically cut off, and a DC test voltage can be applied only to the cable line .

[0007]

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 side view of the connection conductor rod, (c) is a cable head longitudinal sectional view of a case of mounting the insulator 16. In the figure, a bushing 11 is fixed on a wall 2 of a device by a fixing bolt 1.
2 is fixed. 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. In addition, bushing 1
Inside the 1, conductor pull can leave <br/> and rod 13 is provided is connected to the internal circuitry of the device. Furthermore, this bushing 11
An internal electrode 14 for making an electrical connection to a cable line or a power application cable, which will be described later, is arranged in the central portion of the first embodiment.

Below the bushing 11, FIG.
A cable connection terminal A for receiving the end of the cable line 20 described with reference to FIG. At the end of the bushing 11, a power application cable 30 for applying a test voltage to the cable line 20 via the bushing 11.
Opening for providing a power application terminal B at the end of
I have. The power application cable 30 is fixed to the opening 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.

[0009] Here, in the device connecting the cable head of the present invention, the rod 1 out comes conductor pull the bushing 11
A tapered hollow portion 10 is provided between the internal electrode 3 and the internal electrode 14. The hollow portion 10, FIG. 1 connecting conductor rod 15 as shown in (b) or the insulating body 16 for voltage application voltage blocking as shown in Fig. (C), is fitted.
As shown in (b), the connecting conductor bar 15 has a small diameter portion on the left side and a large diameter portion on the right side. This is formed of a conductor having a shape corresponding to the hollow portion 10. A large number of spring-like contacts 15A are provided in the small diameter portion and the large diameter portion. That is, the connection conductor rod 15 inserted through an opening in the bushing 11, when fitted into the hollow portion 10, <br/> to stick out can contact 15A conductor argument provided in the small diameter portion 13 and is in electrical contact. In addition, the large-diameter portion of the connecting conductor bar 15 electrically contacts the inner wall surface of the through-hole of the internal electrode 14. Thus, electrical connection between the conductor pull-out <br/> out rod 13 and the internal electrode 14 is secured.

On the other hand, as shown in FIG. 1A, when the power application terminal B of the power application cable 30 is attached to the opening of the bushing 11 , the connection conductor rod 15 is connected to the bushing 11
Litho Ri out, Warped an insulator 16 as shown in FIG. (C)
It is inserted into the opening of the thing 11 and fitted into the hollow part 10 .
The insulator 16 has a substantially circular vertical shape corresponding to the shape of the hollow portion 10. The through hole of the internal electrode 14 is provided with a screw groove for screwing the disk-shaped fixture 17.
Therefore, when the fixing member 17 is advanced toward the left side of the figure while rotating the fixing member 17, the insulator 16 is pushed by the fixing member 17 and pressed against the inner wall surface 10A of the hollow portion 10 with a predetermined pressure. Can be

The reason why the fixing bracket 17 is provided is that when a high DC voltage is applied to the internal electrode 14,
This is to prevent dielectric breakdown from occurring along the inner wall surface 10A. That is, the insulator at a predetermined pressure above 16
Is pressed against the inner wall surface 10A of the hollow portion 10, whereby a certain withstand voltage characteristic can be obtained. As shown in FIG. 1C, a plug 36 that can be easily electrically connected to the conductor 34 from which the insulator 33 has been peeled is attached to the terminal portion of the power application cable 30 as shown in FIG. That is,
The conductor 34 is inserted into the through hole of the plug 36 and the wedge 3
7 is inserted from the left side of the figure, and the wedge 37 is cut between the conductor 34 and the plug 36 by screwing the push nut 38 into the plug 36 to obtain the fixing and electrical connection between the two. On the outer periphery of the plug 36, a contact 31A similar to the connecting conductor bar 15 shown in FIG. Accordingly, by inserting the power application cable 30 into the through-hole of the internal electrode 14, the electrical connection between the internal electrode 14 and the plug 36 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 the DC as described above.
The pressure resistance test was completed, and a longitudinal sectional view of the bushing in a normal use state is shown.

As shown in the figure, a terminal 24 connected to a conductor of a cable line 20 is inserted into a cable connection terminal A of a bushing 11, and an electric connection with an internal electrode 14 is made by a tulip contact 21. The cable line 20 is fixed to 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 that of the power application cable, and there is no difference from the configuration generally used conventionally. When the power supply cable is not attached, the insulation plug 40 is fitted into the power supply terminal B as shown in the figure. Electrode plates 41 and 42 are provided on the high and low pressure sides of the insulating plug 40 , respectively, and the other portions are made of insulating rubber. Further, the power application terminal B is connected to the lid 43 and the bolt 45.
Is hermetically sealed. Back surface of lid 43 and electrode plate 42
A spring 44 is inserted between the inner wall of the bushing 11 and the insulating plug 40 . In such a state, the hollow portion of the bushing 11 is first placed in FIG.
The connecting conductor bar 15 described with reference to FIG.

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
In the case where a DC high voltage is applied using 0 to perform a DC withstand voltage test, as shown in FIG. 1A, before attaching the power application cable 30 to the power application terminal B , Bushing 11
As shown in FIG. 1C , the insulator 10
Insert 16 into the opening and fit. As a result, FIG.
As shown in FIG.
Is applied with a high DC voltage. On the other hand, with respect to out rod 13 can conductor pull, DC high voltage is blocked by the insulator 16, the DC high voltage is not voltage application inside the equipment.

[0014] On the other hand, after the completion of DC withstand voltage test is, cable for the voltage application
After removing the end of the cable 30, taken out <br/> the insulator 16 from the bushing 11, as shown in FIG. 2, fitting the connecting conductor rod 15 in the hollow portion 10. Then, the insulating plug 40 shown in FIG. 2 is attached. Thus, cable line 20 and the connecting conductor rod 1 and the out rod 13 can conductor pull
5 for electrical connection. Therefore, normal use as described above with reference to FIG. 4 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. Further, rod or connecting conductor rod out can conductor pull or voltage application voltage shapes of blocking the insulator, is no problem freely modified within the scope to achieve the above object.

[0015]

Device connecting the cable head of the present invention described above, according to the present invention is provided with a hollow portion to accommodate a replaceable connection conductor for electrically connecting the conductor pull can out rod and the internal electrodes in the interior of the bushing, when voltage application test voltage of direct current cable line by using a voltage application cable is connected electrically
Since the insulator can be inserted in place of the body , a DC withstand voltage test of the cable line can be performed without applying a high DC voltage to the device. Accordingly, it is possible to prevent a high DC voltage from being applied in the device during the DC withstand voltage test of the cable line, thereby preventing dust from adhering to the inner wall of the device. Further, instead of blocking by simply insulating gas, by using an insulator, it does not require the interior of the degassing or other processing of the bushing. In addition, by checking and cleaning the hollow portion of the bushing when replacing the connection conductor , high electrical characteristics can be maintained and reliability can be further improved. According to the present invention, this type of bushing structure, which has been conventionally used for a voltage of about 20,000 volts or 30,000 volts, can be put to practical use even for equipment of about 60,000 volts.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a cable head for device connection according to the present invention, in which (a) is a longitudinal sectional view, (b) is a side view of a connecting conductor bar, and (c) is a DC withstand voltage test. FIG. 3 is a vertical sectional view of a cable head for device connection.

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 equipment wall 10 hollow portion 11 cable A cable connecting terminals B Division collector terminal bushings 15 connecting the bars 16 insulator 20 cable line 30 lessons electrostatic

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-58817 (JP, A) JP-A-4-265617 (JP, A) JP-A-59-117119 (JP, U) JP-A-2- 49320 (JP, U) JP-B-55-31684 (JP, B2) JP-B-46-31061 (JP, Y1) JP-B-49-46620 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 15/00-15/196

Claims (3)

(57) [Claims] 1. A bushing mounted on a wall of an apparatus.
And an internal circuit of the device provided in the bushing.
A conductor drawer rod to be electrically connected and a
A cable line for applying power to the internal circuit
An internal electrode to be electrically connected and a DC
Attach the end of the test cable that applies the test voltage
And an opening provided at the end of the bushing.
A cable lead for connecting the conductor and the internal electrode in the bushing.
And a hollow portion formed in communication with the opening portion, and exchangeably disposed in the hollow portion through the opening portion.
A device for electrically connecting the conductor withdrawal rod and the internal electrode
A connection conductor for power application and the opening in the hollow portion for applying the test voltage.
The conductor is disposed in place of the connection conductor through an opening,
Insulation to cut off the electrical connection between the drawer bar and the internal electrode
And a body terminating said inner electrode and is electrically connected to the Division conductive cable
Device attached to the opening
Cable head for connection . 2. In the hollow part, The insulator is pressed against the inner wall surface of the hollow portion with a predetermined pressure.
2. The device connection according to claim 1, further comprising:
Cable head for connection. 3. A bushing mounted on a wall of an apparatus.
And an internal circuit of the device provided in the bushing.
And a conductor drawer rod to be connected to the bushing.
Cable line for applying power to the internal circuit
DC test on the internal electrodes that are
Attach the end of the test cable that applies the test voltage
An opening provided at an end of the bushing.
A method for using a device-connecting cable head , comprising: the conductor pull-out bar and the internal electrode in the bushing.
And a hollow portion communicating with the opening portion is formed between the opening portion and the connecting conductor in the hollow portion through the opening portion so as to be exchangeable.
And electrically connect the conductor extraction rod to the internal electrode.
When applying the test voltage, the insulator is connected to the opening.
Replaced with the connection conductor through and arranged in the hollow portion,
Cut off the electrical connection between the conductor extraction rod and the internal electrode
At the same time, the terminal of the power supply cable is electrically connected to the internal electrode.
For connection to equipment characterized by being attached to the opening by means of
How to use the cable head.