JPH07140196A - Connector for cable test - Google Patents

Abstract

PURPOSE:To provide a member for facilitating electrical connection between a cable terminal and a lead wire at the time of electric test of a cable line. CONSTITUTION:The connector 20 for cable test is employed for each bushing 12A, 12B of cables 15A, 15B laid contiguously and interconnected electrically through a short circuit lead 21. A connecting terminal part 22 is inserted into the bushing 12A, 12B and connected detachably with an inner electrode 14. Consequently, a fault location loop, e.g. a muray loop, is established. Each cable may be connected with a DC power supply for withstand voltage test using other lead wire in place of the short circuit lead 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable test connector used for electrically connecting between conductors of cables of different phases at a cable end.

[0002]

2. Description of the Related Art When a cable causes a ground fault,
The Murray loop method is known as a method of evaluating the accident point. FIG. 2 shows a specific measurement circuit connection diagram of the Murray loop method. As shown in the figure, for example, cable 1
When a ground fault occurs in B, the fault point is grounded by the ground fault resistor R. In such a case, first use the cable 1A installed adjacent to the cable 1B, and
Connect a galvanometer G to A and 2B. Further, a variable resistor 4 is connected to both ends of this galvanometer G. A DC power supply 6 is connected between the tap 5 of the variable resistor 4 and the ground. On the other hand, the other ends 3A and 3B of the two cables 1A and 1B are electrically connected using the short-circuit lead 7.

When such a Wheatstone bridge is formed, it is possible to calculate in which portion of the cable 1B the ground fault has occurred depending on the position of the tap 5 of the variable resistor 4 by using a simple proportional coefficient equation.

[0004]

By the way, when the accident point is evaluated by the above method, there have been the following problems to be solved in the past. Today, gas-insulated sealed equipment is used in consideration of safety and easiness of maintenance in equipment used in substations and the like. The cables are also directly connected to these devices. Therefore, when attempting to connect between the phases of the cable using the short-circuit lead 7 as shown in FIG. 2, it is necessary to open the lid of the device to accommodate the short-circuit lead 7 inside and mount it. However, in this case, the insulating gas of the equipment flows out, and when the lid of the equipment is closed again, the refilling work or the like is required, which not only becomes a large scale, but also the expensive gas is lost.

The same applies not only to the terminal to which the short-circuit lead 7 is connected as described above, but also to the terminal to which the galvanometer G, the power source E, etc. are connected. The present invention has been made in view of the above points, and provides a cable test connector that can easily be electrically connected to a cable terminal when performing an electrical test of a cable line as described above. The purpose is to do.

[0006]

A cable test connecting body of the present invention comprises a connecting terminal portion and a lead connecting portion provided at one end of the connecting terminal portion, and the connecting terminal portion is cylindrical. A spring-like contactor is provided on the outer peripheral surface thereof for detachable electrical connection to the internal electrode of the cable connecting bushing, and the lead connecting portion is connected with a lead wire for electrical connection with a test device. It is characterized by being done.

[0007]

The connecting body for cable test is used, for example, one for each bushing of the cable laid adjacent to each other, and these are electrically connected by using the short-circuit lead. The connection terminal portion is removably inserted and connected to an internal electrode arranged inside the bushing. This allows
Connections can be made for locating accident points using the Murray loop method, etc. It is also possible to use other lead wires instead of the short-circuit leads to connect each cable to the DC power source for the withstand voltage test.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1A and 1B show an embodiment of a cable test connector according to the present invention. FIG. 1A is a perspective view of a state of use thereof, and FIG. 1B is a sectional view of an internal electrode portion of a bushing. As shown in the figure, for example, two cables 15A and 15B are directly connected bushings 12A and 1A fixed to the outer wall 11 of the device.
It is terminated inside 2B. This bushing 12A, 1
Internal electrodes for electrical connection are provided in the inside of 2B. Here, a cable test connector 2 as shown in the figure is provided.
0 is installed. The cable test connectors 20 inserted into the bushings 12A and 12B are electrically connected to each other using short-circuit leads 21.

Such a cable test connector 20 is
As shown in (b) of the figure, the connection terminal portion 2 is provided at one end thereof.
Equipped with 2. This connection terminal portion 22 is a bushing 12
It is inserted into the through hole 14A of the internal electrode 14 arranged inside A or 12B. In addition, the connection terminal portion 22,
A rod-shaped lead connecting portion 23 is provided at the rear end.
The short-circuit lead 21 is electrically connected here.

Before describing the specific structure of the cable test connector of the present invention, first, the specific configuration of the bushing that directly connects the cable and the device will be described. FIG. 3 shows a vertical cross-sectional view of the connection portion between the cable and the device. In the figure, a through hole 11A is provided in the outer wall 11 of the device, and a bushing 12 is fixed thereto by a bolt 13. The left end of the bushing 12 penetrates the through hole 11A and enters the inside of the device.

The bushing 12 has an L-shaped sectional structure as a whole, and an internal electrode 14 formed in a similar L shape is embedded therein. The cable 15 electrically connected to such a device is launched from the lower side of the figure,
The insulator 16 is removed to expose the conductor 17. The conductor 17 is detachably electrically connected to the internal electrode 14 via a tulip contact 18.

Further, the bushing 12 is provided with a charging port B in addition to the cable connection port A for connecting such a cable 15. A lead cable for pressure resistance test (not shown) is electrically connected to the charging port B. When such a cable is not connected, the insulating plug 19 is inserted to close the power charging port B and is closed by the lid 24.

Next, FIG. 4 shows a partial longitudinal sectional view of the cable test connector of the present invention. As shown in the figure, a connection terminal portion 22 is provided at one end of the cable test connector 20. The connecting terminal portion 22 has a step portion 25 as a boundary, and the through hole 14A of the internal electrode 14 shown in FIG.
A columnar portion having an outer diameter that fits in is formed, and a large number of spring-shaped contacts 26 are arranged on the outer periphery thereof. The spring-shaped contacts 26 are sandwiched between the connection terminal portion 22 and the internal electrode 14 of the bushing by the force of the springs, respectively, to apply pressure, and are configured to make good electrical connection with each other.

A rod-shaped lead connecting portion 23 is provided in a portion connected to the connecting terminal portion 22. A screw hole 27 is provided at the end of the lead connecting portion 23. A screw (not shown) is screwed into the screw hole 27 to connect the short-circuit lead 21 and the like shown in FIG. The outer peripheral surface of the lead connecting portion 23 is covered with an insulating cover 28 for electrical protection. The operator grasps here and operates it.

The cable test connector of the present invention having the above-described structure has its lead connection portion 23 in the state as shown in FIG.
Grab the portion of the connection terminal 22 and bushing 12A, 1
It is attached to the internal electrode 14 of 2B. And bushing 1
By connecting the short-circuit lead 21 to the lead connecting portion 23 protruding from the openings of 2A and 12B, the two cables 15A, 1
5B can be short-circuited.

The cable test connecting body of the present invention comprises:
By mounting the bushings 12A and 12B as shown in FIG. 1, a DC power supply can be connected.
That is, a variable resistor is connected to the lead connecting portion 23 via a lead wire (not shown), and a DC power supply is connected to the tap. In this way, a DC voltage can be applied to the cables 15A and 15B and one end of these can be easily short-circuited without opening the lid of the device.

The present invention is not limited to the above embodiments. In the above-mentioned embodiment, the step portion 25 is provided in the connection terminal portion 22 of the cable test connecting body 20, and the through hole 14A of the internal electrode is provided.
The insertion length was adjusted. However, if a stopper or the like is provided on the side of the through hole 14A provided in the internal electrode 14, the connecting terminal portion 22 may have a uniform outer diameter. Further, the lead connecting portion 23 configured to extend in a long rod shape from one end of the connecting terminal portion 22 has a length sufficient to have a cable test connecting body and a function for performing electrical connection or the like. Therefore, the portion to which the lead wire or the like is connected is not necessarily linear, and may be bent in an appropriate shape. Further, it may be formed in an appropriate shape for easy carrying and grasping by hand.

[0018]

The cable test connecting body of the present invention described above is provided with the connecting terminal portion and the lead connecting portion at one end of the connecting terminal portion, and the inside of the cable connecting bushing is provided on the outer peripheral surface of the connecting terminal portion. A spring-like contactor for detachable electrical connection to the electrode is provided, and a short-circuit lead or other lead wire led from a power source is connected to the lead connection part, so it can be used as a bushing for directly connecting a cable to a device. It can be easily installed and short-circuited between the phases, or the cable and other electrical equipment can be electrically connected. Therefore, it is not necessary to open the lid of the device for electrical connection, and the workability is good and the cable test can be easily performed in a short time.

[Brief description of drawings]

FIG. 1 shows an embodiment of a connector for cable test of the present invention,
(A) is a perspective view which shows the use state, (b) is sectional drawing which shows the connection state of an internal electrode and the cable test connection body.

FIG. 2 is a measurement circuit connection diagram for performing a general Murray loop method.

FIG. 3 is a vertical cross-sectional view of a connection portion between a cable and a device, which is suitable for mounting the cable test connector of the present invention.

FIG. 4 is a vertical cross-sectional view of a main part of a cable test connector of the present invention.

[Explanation of symbols]

 11 Outer wall of equipment 12A, 12B Bushing 15A, 15B Cable 20 Cable test connection 21 Short-circuit lead 22 Connection terminal 23 Lead connection

Claims (1)

[Claims] 1. A connection terminal portion, and a lead connection portion provided at one end of the connection terminal portion, wherein the connection terminal portion has a cylindrical shape, and an outer peripheral surface of the connection terminal portion has an inside of a cable connection bushing. A connector for cable test, wherein a spring-like contactor for detachably electrically connecting to the electrode is provided, and a lead wire for electrically connecting to a testing device is connected to the lead connecting portion.