JPH03200078A - Test electrical method for stress cone - Google Patents

Abstract

PURPOSE:To enable the work by one man to pull out an electrode for supply test current and to improve the working efficiency by interposing a ring body for pulling- out having the outside diameter larger than that of the end part of a stress cone between the end part of stress cone and the head part of electrode for supplying test current. CONSTITUTION:The ring body 15 for pulling-out consists of an insulator and the outside diameter is set larger than that of the tip part of insulation part 2 in the stress cone 1 and the inside diameter of through-hole 15a is set a little larger than the outside diameter of a body part 6. First of all, the barrel part 6 of pole 5 for supplying test current is inserted between the through-hole 15a of ring body 15 and inserted in a cable inserting hole 4 of the stress cone 1 to interpose the ring body 15 between the tip end of insulator part 2 and the head 7 of pole 5. A prescribed voltage is applied for a fixed time between a conductor 8 of the electrode 5 sand a semiconductor part 3 of the stress cone 1 to confirm the existence of inside abnormality of the stress cone 1. Next, a female screw part 14 is fitted to a male screw part 21a of bolt 21 which is fixed to a wall body 20, etc., of the room inside, to fix the pole 5 to the wall body 20, and the stress cone 1 is pulled out from the pole 5 together with the ring body 15 while clamping the ring body 15.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to an electrical test method for checking the performance of a stress cone attached to the terminal end or connection part of an electric cable, and in particular, to a cable insertion hole of the stress cone. The present invention relates to an electrical testing method for a stress cone, in which a test electrification electrode inserted into a stress cone can be easily pulled out from the stress cone.

(Prior Art) As shown in the cross-sectional view of FIG. 2, the stress cone 1 is integrated with an insulating part 2 made of insulating EP rubber (ethylene propylene rubber) and a semiconducting part 3 made of semiconductive EP rubber. Vulcanized and molded.

By the way, in the stress cone 1, the dielectric breakdown voltage decreases due to internal abnormalities such as the presence of voids, the inclusion of foreign matter, and peeling between the insulating part 2 and the semiconducting part 3, which may lead to a dielectric breakdown accident. .

Therefore, in recent years, in order to increase the reliability of the stress cone 1, performance tests have been conducted to check whether there are any internal abnormalities on each stress cone at the time of shipment from the factory.As an example of this performance test, an electrical test method has been adopted. There is.

This electrical test method involves inserting a body part 6 of a test energizing electrode 5, which simulates the cable actually used, into a cable insertion hole 4 provided in a stress cone 1, and then embedding the body part 6 in this body part 6. A specified voltage is applied between the conductor 8 and the semiconductive part 3 of the stress cone 1 for a certain period of time to check whether there is an internal abnormality,
Next, the body 6 of the test energizing electrode 5 is pulled out from the cable insertion hole 4 of the stress cone 1.

In FIG. 2, reference numeral 9 indicates an epoxy insulator constituting the body 6, reference numeral 10 indicates a bolt for fixing the charging lead wire, and reference numeral 11 indicates an epoxy insulator that is applied to the tip of the epoxy insulator 9. This shows the conductive paint.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional electrical testing method, the cable insertion hole 4 of the stress cone 1 and the test voltage charging mold fi
i! In order to prevent the contact interface between the body part 6 and the body part 5 from being destroyed, the outer diameter of the body part 6 is set to be 0.3 mm or more larger than the inner diameter of the cable insertion hole 4.
It has become extremely difficult to pull it out.

Conventionally, when pulling out the test energizing electrode 5, one person grasps the conical insulating part 2 of the stress cone 1, and another person grasps the head 7 of the test energizing electrode 5 and inserts the cable. A method has been adopted in which the body part 6 of the test energizing electrode 5 is pulled out from the hole 4, but this requires two people to pull out the work, resulting in poor working efficiency and the insulating part 2 being gripped. If too much force is applied to the hand, this force will act in the direction of reducing the diameter of the cable insertion hole 4, and the contact pressure between the cable insertion hole 4 and the body 6 will increase, causing the test electrification electrode 5 to be pulled out. There were some problems that made the work even more difficult.

Therefore, this invention has been devised in consideration of the above-mentioned circumstances, and aims to reduce product costs by improving work efficiency by making it possible for one person to pull out the test electrification electrode 5. The purpose of the present invention is to provide an electrical testing method for stress cones that enables the following.

(Means for Solving the Problems) To solve the above problems, the present invention provides that when inserting the body of the test electrification electrode into the cable insertion hole of the stress cone, the ends of the stress cone and the test A drawing conductor having an outer diameter larger than the outer diameter of the end of the stress cone is interposed between the head of the electrification electrode, and then a conductor is inserted into the stress cone through the test energization electrode. Applying a specified voltage, then locking the locking part provided on the test energizing electrode to a locking part not provided on a wall, etc., and then the state in which both of the locking parts are locked together. The method is characterized in that the stress cone is pulled out from the body of the test electrification electrode by sliding the pull-out ring body toward the stress cone.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 is a sectional view showing a state in which a test voltage application electrode is inserted into a stress cone.

As shown in FIG. 1, the stress cone 1 is made of insulating EP
An insulating part 2 made of rubber (ethylene propylene rubber) and a semiconductive part 3 made of semiconductive EP rubber are integrally vulcanized and molded, and an electric cable (not shown) is inserted into this stress cone 1. A cable insertion hole 4 is provided in the axial direction.

The test energizing electrode 5 simulates an actual cable cable, and the test energizing electrode 5 has a body 6 inserted into the cable insertion hole 4 and a base end of the body 6. The head 7 is provided on the side and has a larger diameter than the body 6. In order to prevent damage to the contact interface between the cable insertion hole 4 of the stress cone 1 and the body 6 of the test charging electrode 5, the outer diameter of the body 6 should be 0.0 mm smaller than the inner diameter of the cable insertion hole 4. 311
It is desirable to set it to 111 or more.

In addition, in the epoxy insulator 9 constituting the body 6,
A conductor 8 is buried therein, and at the tip of the body 6,
A conductive paint 11 is applied.

Furthermore, on the head 7 of the test electrification electrode 5.

A cylindrical conductor piece 12 is fixed by a bolt 13.13, and a female threaded portion 1 is provided approximately at the center of the conductor piece 12.
4 is formed.

Next, the electrical test method of this example will be explained.

First, the body 6 of the test electrification electrode 5 is inserted into the through hole 15a of the pull-out ring body 15. In addition, this drawing ring body 1
5 is made of an insulator, and its outer diameter is set larger than the outer diameter of the tip of the insulating part 2 of the stress cone 1, and the inner diameter of the through hole 15a is slightly larger than the outer diameter of the body part 6. It is set large.

Next, the body part 6 of the test energizing electrode 5 is inserted into the cable insertion hole 4 of the stress cone 1, and the pull-out ring body 17 is inserted between the tip of the insulating part 2 and the head of the test energizing electrode 5. It is interposed between the lower end of 7.

Next, a specified voltage is applied between the conductor 8 of the test voltage application electrode 5 and the semiconductive portion 3 of the stress cone 1 for a certain period of time, and the presence or absence of an internal abnormality in the stress cone 1 is checked.

Next, the test energizing electrode 5 is fixed to the wall 20 by screwing the female thread 14 into the male thread 21a of the bolt 21 fixed to the wall 20 or the like in the room.

Next, with the test electrification electrode 5 fixed to the wall 20, hold the pull-out ring body 15, slide the pull-out ring body 15 toward the stress cone 1 (in the direction of the arrow in the figure), and pull it out. The stress cone 1 together with the test ring body 15 is pulled out from the test electrification electrode 5.

Then, remove the test charging electrode 5 from the bolt 21,
Prepare for the next stress cone electrical test.

As explained above, according to the electrical test method of this embodiment, during the pulling operation, the test voltage application electrode 5 is connected to the wall body 2.
Since the stress cone 1 is fixed at 0, the test electrification electrode 5 can be pulled out from the stress cone 1 by one person, and product costs can be reduced by improving work efficiency.

In addition, during the extraction operation, since the extraction ring body 15 is grasped and slid, there is no need to grasp the conical insulating part 2, and unlike the conventional extraction operation, the test energizing electrode 5 It will not be difficult to pull out.

Furthermore, since the stress cone 1 is not damaged during the pulling process, it is expected that the yield will be improved and product costs will be reduced.

In the above embodiment, the female threaded portion 14 is used as the locking portion on the test energizing electrode 5 side, and the male thread portion 21a of the bolt 21 is used as the locking portion on the wall body 20 side. The locking part is not limited to the structure of the embodiment, and for example, a hook or the like may be adopted (Effects of the Invention) As explained above, according to the stress cone electrical testing method according to the present invention, Since one person can pull out the test charging electrode from the stress cone, it is possible to reduce product costs by improving work efficiency.

In addition, since it is not necessary to grasp the insulating part of the stress cone during the drawing operation, it is not difficult to pull out the test energizing electrode unlike in the conventional extraction earing operation.

Furthermore, since the stress cone is not damaged during the pulling operation, it is expected that the yield will be improved and product costs will be reduced.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an embodiment showing a state in which a test electrification electrode is inserted into a stress cone, and Fig. 2 is a sectional view of a conventional example showing a state in which a test electrification electrode is inserted into a stress cone. FIG. 1... Stress cone 4...
・・・・・・Cable insertion hole 5・・・・・・・・・・・・
・・Test electrification electrode 6・・・Body portion 7・・・・・・・−・Head 14・・・Female threaded portion ( Locking part>15...
. . . Extraction ring body 20 . . . Wall body 21 . . . Bolt 21a . . . Male threaded part (locking part) first Figure diagram

Claims (1)

[Claims] When inserting the body of the test energizing electrode into the cable insertion hole of the stress cone, there is a gap between the end of the stress cone and the head of the test energizing electrode, so that the outer diameter is at the end of the stress cone. A drawing ring body larger than the external diameter is interposed,
Next, a specified voltage is applied to the stress cone via the test energizing electrode, and then a locking part provided on the head of the test energizing electrode is connected to a locking part provided on a wall or the like. the stress cone is then pulled out from the body of the test electrification electrode by sliding the pull-out ring body towards the stress cone with both of the locking parts locked together; Characteristic electrical testing method for stress cones.