CN106443089A - Connecting device for oscillatory wave test - Google Patents

Abstract

The invention discloses a connection device for an oscillating wave test, comprising: a conductor used to be inserted into an elbow-shaped head in the oscillating wave test and capable of being firmly connected with a cable terminal inside the elbow-shaped head; the conductor One end of the conductor has an assembly hole adapted to the clamping hole on the cable terminal head, and the other end of the conductor has a connection terminal for connecting the high-voltage detection equipment; it also includes: to be locked in the assembly hole of the conductor and connect the conductor The bolts tightly connected with the cable terminal head, wherein: the conductor is placed inside the elbow head, the assembly hole is aligned with the clamping hole of the cable terminal head, the bolt passes through the clamping hole and is locked in the assembly hole, and the bolt, Conductors and cable lugs are securely connected. The connecting device for the oscillatory wave test of the present invention does not need to separate the elbow head from the cable terminal, improves the mode of the oscillatory wave test, improves operating efficiency, reduces labor costs, reduces the damage rate of the elbow head, and reduces the test cost.

Description

A connection device for oscillatory wave test

technical field

The invention relates to the field of electrical appliances, in particular to a connection device for an oscillatory wave test.

Background technique

In the prior art, for the case where one or both ends of the cable are connected to the ring network cabinet, to carry out the oscillatory wave test, the cable terminal needs to be separated from the elbow, that is, the cable terminal needs to be completely exposed before the operation can be performed. The technical problems in this way of operation are:

1. The whole test takes about 1 hour, which is time-consuming and labor-intensive, and the labor cost is high;

2. The existing connection structure between the cable terminal and the elbow is as follows: the cable terminal is sleeved with a stress tube, the stress tube is coated with a silicone grease layer, and the elbow is wrapped around the outside of the stress tube. After the cable has been in operation for a period of time, the temperature of the cable terminal head is higher than before operation, so the silicone grease changes, which will tightly connect the elbow head and the stress tube. At this point, if the cable needs to be subjected to an oscillating wave test, the elbow will crack during the process of separating the elbow from the cable terminal. If this happens, the elbow must be replaced. For example, in the oscillating wave test of about 68 cables (136 elbows) carried out by the applicant in 2015, 20 single elbows were damaged, and the damage rate was as high as 14.7%. Therefore, it can be concluded that the existing connection structure between the cable terminal head and the elbow head has a high damage rate during each single test, and the test and labor costs are high, which is not conducive to the popularization of the test.

To sum up, with the continuous deepening of the reform of electric power enterprises, how to save costs and improve economic benefits has become a problem that electric power enterprises must think about. On the other hand, the requirements of enterprises and residents for power supply services are also increasing. In this case, how we do a good job in the detection and testing of electrical equipment and reduce its failure rate is particularly important.

Contents of the invention

The technical problem to be solved by the present invention is to provide a connection device for oscillatory wave test without separating the elbow head from the cable terminal, improve the way of oscillatory wave test, improve operation efficiency, reduce labor cost; The damage rate of the head is reduced, and the test cost is reduced.

In order to solve the above-mentioned technical problems, the embodiment of the present invention provides a kind of connection device for the oscillatory wave test, comprising: the cable used to be inserted into the inside of an elbow head and capable of connecting with the inside of the elbow head in the oscillatory wave test The terminal head is fastened to the conductor, one end of the conductor has an assembly hole for fitting with the clamping hole on the cable terminal head, and the other end of the conductor has a connection terminal for connecting the high-voltage detection equipment; it also includes: for locking The bolts in the assembly hole of the conductor and fasten the conductor to the cable terminal head, wherein: the conductor is placed inside the elbow head, the assembly hole is aligned with the clamping hole of the cable terminal head, the bolt passes through the clamping hole and Lock in the assembly hole to securely connect the bolts, conductors and cable terminals.

Wherein, the conductor is rod-shaped, which includes a conductor body and an insulating sheath covering the outside of the conductor body.

Wherein, the insulating sheath is a cold shrink tube.

Wherein, the bolts are inner hexagonal bolts or outer hexagonal bolts for reducing external discharge, and the inner hexagonal bolts or outer hexagonal bolts are made of alloy steel.

Among them, it also includes: flat washers and spring washers respectively sleeved on the inner hexagonal bolts to enhance the locking force of the bolts, conductors and cable terminals.

Wherein, the flat pad is integrally formed with the conductor and/or the bolt.

Wherein, the cable terminal head is connected with the elbow head as a whole.

Implementing the connecting device for oscillatory wave test of the present invention has the following beneficial effects:

First, the conductor is placed inside the elbow head, the assembly hole is aligned with the clamping hole of the cable terminal head, the bolt passes through the clamping hole and locked in the assembly hole to fasten the bolt, conductor and cable terminal head, There is no need to separate the elbow from the cable end for normal testing purposes. It can reduce the test time by more than 20 minutes and improve the working efficiency.

Second, the structure is simplified and easy to implement, which can reduce the damage rate of the elbow head to less than 5%, which is more conducive to the promotion of oscillatory wave tests, satisfies production needs well, reduces labor and test costs, and creates greater economy benefit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of a conductor of a connecting device used in an oscillatory wave test according to Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a hexagon socket bolt of a connection device used in an oscillatory wave test according to Embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a connection device for an oscillatory wave test according to Embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of the conductor of the connecting device used in the oscillatory wave test in Embodiment 2 of the present invention.

Fig. 5 is a schematic structural view of the hexagon socket head bolt of the connection device used for the oscillatory wave test in the second embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Fig. 1-Fig. 3, it is the first embodiment of the connection device used in the oscillatory wave test of the present invention.

The oscillatory wave test in this embodiment is an effective method for evaluating the status of 10kV cables in the distribution network. Through the oscillatory wave test of the cable, it can be found whether there is a partial discharge point in the cable, and the specific location of the partial discharge point can be located, so as to organize and implement maintenance in the future.

The connection device used for the oscillatory wave test in this embodiment includes: a conductor 3 for being inserted into the inside of an elbow 1 and capable of being firmly connected to the cable terminal 2 inside the elbow 1 in the oscillatory wave test, One end of the conductor 3 has an assembly hole 31 for fitting with the clamping hole 21 on the cable terminal head 2, and the other end of the conductor 3 has a connection terminal for connecting the high voltage detection equipment; The bolt 4 in the assembly hole 31 of the conductor 3 and fastens the conductor 3 and the cable terminal head 2, wherein: the conductor 3 is placed inside the elbow head 1, and the assembly hole 21 is aligned with the clamping hole 21 of the cable terminal head 2 According to the standard, the bolt 4 passes through the clamping hole 21 and is locked in the assembly hole 31 to securely connect the bolt 4, the conductor 3 and the cable terminal head 2.

The cross-section of the elbow head 1 is T-shaped, and it is respectively provided with open accommodating holes 1a, 1b, 1c at the left and right opposite ends and the bottom end as shown in the figure, and the accommodating holes 1a at the bottom are used for tightening Fix the cable terminal head 2 firmly. In this embodiment, the cable terminal 2 and the elbow 1 are integrated, so that under normal test conditions, there is no need to disassemble the cable terminal 2 and the elbow 1 to reduce the damage rate of the elbow 1 . The accommodating holes 1a and 1b at the left and right ends of the elbow 1 are used to assemble the conductor 3 and the bolt 4, so as to realize the fast connection of the bolt 4, the conductor 3 and the cable terminal head 2. It is assembled through the following structure:

The cable terminal 2 is inserted into the inside of the elbow 1 by the accommodating hole 1a at the bottom of the elbow 1 and fastened. The end of the cable terminal 2 has a holding hole 21, which is a through hole , and its opposite ends are facing towards the direction of the accommodating holes 1a, 1b of the elbow head 1 respectively.

Further, one end of the conductor 3 has an assembly hole 31 adapted to fit the clamping hole 21 on the cable terminal head 2 , and the other end of the conductor 3 has a connection terminal 32 for connecting to a high voltage detection device. During specific implementation, the conductor 3 is rod-shaped, and it includes a conductor body 3a and an insulating sheath 3b coated on the outside of the conductor body 3a. The material of the conductor body 3a is copper, and the insulating sheath 3b is a cold-shrink tube, and the assembly hole 31 is opened. On the conductor body 3 a , its diameter is equivalent to that of the holding hole 21 .

Further, it also includes: a bolt 4 for locking in the assembly hole 31 of the conductor 3 and fastening the conductor 3 with the cable terminal head 2 . Preferably, the bolt 4 is an inner hexagon bolt or an outer hexagon bolt for reducing external discharge, and the inner hexagon bolt or the outer hexagon bolt is made of alloy steel.

Preferably, it also includes: a flat washer 5 and a spring washer 6 respectively socketed on the hexagon socket head bolts to enhance the locking force of the bolt 4 , the conductor 3 and the cable terminal head 2 .

When the connection device used for the oscillatory wave test is implemented in this embodiment, the conductor 3 is first contacted from the side of the accommodating hole 1b of the elbow 1 to the lug of the cable terminal head 2, and the assembly hole 31 on the conductor 3 Align the clamping hole 21 of the lug of the cable terminal head 2, and then use a wrench to enter the hexagon socket bolt 4 from the side of the accommodating hole 1a of the elbow head 1, align it with the assembly hole 31 on the conductor 3, and tighten it. At this time, the flat washer 5 and the spring washer 6 play the role of closely connecting the hexagon socket bolt 4, the lug of the cable terminal head 2, and the conductor 3 to achieve good contact. In this way, after the elbow 1 is separated from the ring main unit, it is not necessary to separate the lug of the cable terminal 2 from the elbow 1, as long as the bolt 4, the conductor 3 and the lug of the cable terminal 2 are completed according to the above steps connection, the normal oscillatory wave test can be performed.

Further, the applicant conducted an application test on the above-mentioned connecting device used for the oscillatory wave test, and the specific data are as follows:

In 2015, the applicant carried out 20 single-cable oscillatory wave tests, which were carried out under the two conditions of completely bare cable lugs and connecting devices, and the average test time, elbow damage rate, and test conclusions were consistent. Performance (whether there is a partial discharge point, the location of the partial discharge point) for comparison in three aspects:

Average test: in the prior art, the method for separating the cable terminal head 2 and the elbow-shaped head 1 takes about 60 minutes on average for each single oscillation wave test; the average time for each single oscillation wave test is about 60 minutes for the method of using the connection device of the oscillation wave test About 40 minutes. Compared with the two, the average saving time of each single test using method two is about 20 minutes.

Elbow damage rate: During the oscillating wave test of 20 single (40 elbow) cables, the damage rate of elbow damage in the method of separating the cable terminal 2 from the elbow 1 in the prior art is 15% ( 6 pieces); the method of using the connection device of the oscillatory wave test damages the elbow head to 5% (2 pieces).

Consistency of test conclusions: In the prior art, the method of separating the cable terminal head 2 and the elbow head 1 and the method of using the connection device of the oscillatory wave test were tested. The same goes for the position of the bureau release point. It can be seen that the oscillatory wave test can be carried out normally by using the above-mentioned connecting device for the oscillatory wave test of the present application, and can reduce the test time and reduce the damage rate of the elbow head.

As shown in Fig. 4-Fig. 5, it is the second embodiment of the connection device used in the oscillatory wave test of the present invention.

The connection device used for the oscillatory wave test in this embodiment is different from the first embodiment above in that,

The flat pad 5 is integrally formed on the conductor 3 and/or the bolt 4, and the effect of such arrangement is: make it easier to assemble.

Implementing the connecting device for oscillatory wave test of the present invention has the following beneficial effects:

First, the conductor is placed inside the elbow head, the assembly hole is aligned with the clamping hole of the cable terminal head, the bolt passes through the clamping hole and locked in the assembly hole to fasten the bolt, conductor and cable terminal head, There is no need to separate the elbow from the cable end for normal testing purposes. It can reduce the test time by more than 20 minutes and improve the working efficiency.

Second, the structure is simplified and easy to implement, which can reduce the damage rate of the elbow head to less than 5%, which is more conducive to the promotion of oscillatory wave tests, satisfies production needs well, reduces labor and test costs, and creates greater economy benefit.

Claims (7)

1. a kind of attachment means for wave of oscillation test, it is characterised in that include：

In order to insert in testing in the wave of oscillation elbow-type head inside and can be tight with the cable terminal inside the elbow-type head The conductor being solidly connected, one end of the conductor has the pilot hole in order to be adapted with the holding hole on the cable terminal, The other end of the conductor has the connection terminal in order to connect high-voltage detecting device；

Also include：In order to be locked in the pilot hole of the conductor and by the conductor and cable terminal fastening even The bolt for connecing, wherein：

The conductor inserts the inside of the elbow-type head, and the pilot hole is aligned with the holding hole of the cable terminal, The bolt through the holding hole and is locked at the bolt, the conductor and the cable termination in the pilot hole Head is fastenedly connected.

2. as claimed in claim 1 attachment means for being used for wave of oscillation test, it is characterised in that the conductor in shaft-like, its Including conductor body and the insulating sheath being coated on outside the conductor body.

3. the attachment means of wave of oscillation test are used for as claimed in claim 2, it is characterised in that the insulating sheath is shrinkage Pipe.

4. the attachment means of wave of oscillation test are used for as claimed in claim 1, it is characterised in that the bolt is to reduce The hexagon socket head cap screw for externally discharging or outer-hexagonal bolt, the hexagon socket head cap screw or the outer-hexagonal bolt use alloy steel material Make.

5. the attachment means of wave of oscillation test are used for as claimed in claim 4, it is characterised in that also included：It is socketed in respectively On the hexagon socket head cap screw in order to strengthen the bolt, the plain cushion of the conductor and the cable terminal coupling mechanism force and bullet Pad.

6. the attachment means of wave of oscillation test are used for as claimed in claim 5, it is characterised in that the plain cushion and the conductor And/or the bolt is integrally formed.

7. the attachment means of wave of oscillation test are used for as claimed in claim 1, it is characterised in that the cable terminal and institute State elbow-type head to be connected as a single entity.