CN-121995174-A - Creeping discharge simulator for cable joint

CN121995174ACN 121995174 ACN121995174 ACN 121995174ACN-121995174-A

Abstract

The application relates to a creeping discharge simulation device of a cable joint. The creeping discharge simulation device of the cable joint comprises a cable joint simulation assembly, a high-voltage power supply, a discharge monitoring assembly and a control assembly, wherein the cable joint simulation assembly comprises a cable, a multi-stage needle-needle electrode array and a cold shrink tube, the discharge monitoring assembly is used for acquiring first state information of the cable joint simulation assembly and sending the first state information to the control assembly, the high-voltage power supply is used for applying voltage to the cable joint simulation assembly under the control of the control assembly, the cable joint simulation assembly is used for generating creeping discharge under the action of the voltage, the discharge monitoring assembly is used for acquiring second state information of the cable joint simulation assembly and sending the second state information to the control assembly after the creeping discharge is finished, and the control assembly is used for determining creeping discharge condition information of the cable joint simulation assembly according to the first state information and the second state information. The application provides a device which can simulate the creeping discharge of a cable joint.

Inventors

LIU JIANHUI
ZHONG GUANGRONG
XIAO YIPENG
QI YAFENG
ZOU JIAKUN
CHEN DONGHUI
Zheng kaixuan
ZHANG HAORAN
DING ZHAOYI
LI YIXIAN
LUO ZHIJIE
CHEN CHUANGSHENG

Assignees

广东电网有限责任公司广州供电局

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (10)

1. The creeping discharge simulation device of the cable joint is characterized by comprising a cable joint simulation assembly, a high-voltage power supply, a discharge monitoring assembly and a control assembly; The cable joint simulation assembly comprises a cable, a multi-stage needle-needle electrode array and a cold shrink tube, wherein the surface of the cable is uniformly coated with insulating silicone grease, the multi-stage needle-needle electrode is sleeved on the outer side of the insulating silicone grease, and the cold shrink tube is sleeved on the outer side of the multi-stage needle-needle electrode array; The discharge monitoring assembly is used for acquiring first state information of the cable joint simulation assembly and sending the first state information to the control assembly; the high-voltage power supply is used for applying voltage to the cable joint simulation assembly under the control of the control assembly; the cable joint simulation assembly is used for generating creeping discharge under the action of the voltage; The discharge monitoring assembly is further used for acquiring second state information of the cable joint simulation assembly after the creeping discharge is finished, and sending the second state information to the control assembly; The control component is used for determining the creeping discharge condition information of the cable joint simulation component according to the first state information and the second state information.
2. The apparatus of claim 1, wherein the control component is configured to determine whether and to what extent the creeping discharge occurs in the cable joint simulation assembly based on the first status information and the second status information, and to determine whether and to what extent the creeping discharge occurs in the cable joint simulation assembly as creeping discharge condition information for the cable joint simulation assembly.
3. The apparatus of claim 2, wherein the control assembly is configured to adjust the voltage applied by the high voltage power source to the cable joint simulation assembly if the creeping discharge condition information of the cable joint simulation assembly indicates that the creeping discharge does not occur in the cable joint simulation assembly.
4. A device according to any one of claims 1 to 3, wherein the cold shrink tube comprises a first cold shrink tube that fits over the outer side of the multi-stage needle-needle electrode array; the first cold shrink tube is sequentially composed of an insulating rubber layer, a high-voltage shielding tube and a stress cone.
5. The device of claim 4, wherein the cold shrink tube further comprises a second cold shrink tube, the second cold shrink tube being sleeved outside the first cold shrink tube; wherein, the second cold shrink tube is rubber cold shrink tube.
6. The device of claim 5, wherein the second cold shrink tube is wrapped with a tape on the outside.
7. A device according to any one of claims 1 to 3, wherein the multi-stage needle-needle electrode array is a brass needled series of electrodes, the length of the electrodes and the degree of electric field non-uniformity created by the needle tip angle decreasing from the left side to the right side of the sandwiched interface of the cable joint analogue component.
8. The device of claim 7, wherein a left most tip electrode of the multi-stage needle-needle electrode array is a high potential end and a right most blunt electrode of the multi-stage needle-needle electrode array is a zero potential end.
9. A device according to any one of claims 1 to 3, wherein the voltage output by the high voltage power supply is a positive polarity voltage.
10. A device according to any one of claims 1 to 3, wherein the cable is a crosslinked polyethylene cable.

Description

Creeping discharge simulator for cable joint Technical Field The application relates to the technical field of power grids, in particular to a creeping discharge simulation device for a cable joint. Background Along with the continuous extension of the power transmission network in the whole country, the number of cable joints is increased in the process of gradually increasing the cable length, the intermediate joints are insulation weak links of the cable lines, the electric field distribution at the interface is extremely uneven, and long-face arc discharge is easily caused by insulation degradation or damage, so that explosion accidents are induced. In the research process of the explosion problem of the cable joint, the creeping discharge process of the cable joint is frequently required to be repeated in a laboratory simulation mode, so that the explosion accident is analyzed. Thus, there is a need for a device that simulates the creeping discharge of a cable joint. Disclosure of Invention In view of the above, it is desirable to provide a creeping discharge simulation device for a cable joint, which is capable of simulating creeping discharge of the cable joint. In a first aspect, the application provides a creeping discharge simulation device for a cable joint, which comprises a cable joint simulation assembly, a high-voltage power supply, a discharge monitoring assembly and a control assembly; The cable joint simulation assembly comprises a cable, a multi-stage needle-needle electrode array and a cold shrink tube, wherein the surface of the cable is uniformly coated with insulating silicone grease, the multi-stage needle-needle electrode is sleeved outside the insulating silicone grease, and the cold shrink tube is sleeved outside the multi-stage needle-needle electrode array; The discharge monitoring assembly is used for acquiring first state information of the cable joint simulation assembly and sending the first state information to the control assembly; The high-voltage power supply is used for applying voltage to the cable joint simulation assembly under the control of the control assembly; The cable joint simulation assembly is used for generating creeping discharge under the action of voltage; the discharge monitoring assembly is also used for acquiring second state information of the cable joint simulation assembly after the creeping discharge is finished and sending the second state information to the control assembly; And the control assembly is used for determining the creeping discharge condition information of the cable joint simulation assembly according to the first state information and the second state information. In one embodiment, the control component is configured to determine whether and to what extent the creeping discharge occurs in the cable joint simulation assembly according to the first state information and the second state information, and determine whether and to what extent the creeping discharge occurs in the cable joint simulation assembly as creeping discharge condition information of the cable joint simulation assembly. In one embodiment, the control assembly is configured to adjust a voltage applied by the high voltage power supply to the cable joint simulation assembly in a case where the creeping discharge condition information of the cable joint simulation assembly indicates that the creeping discharge does not occur in the cable joint simulation assembly. In one embodiment, the cold shrink tube comprises a first cold shrink tube sleeved outside the multi-stage needle-needle electrode array, wherein the first cold shrink tube is composed of an insulating rubber layer, a high-voltage shielding tube and a stress cone in sequence. In one embodiment, the cold shrink tube further comprises a second cold shrink tube sleeved outside the first cold shrink tube, wherein the second cold shrink tube is a rubber cold shrink tube. In one embodiment, the outside of the second cold shrink tube is wrapped with a tape. In one embodiment, the multi-stage needle-needle electrode array is a brass needled series electrode, and the degree of electric field non-uniformity generated by the length of the electrode and the angle of the needle tip decreases from the left side to the right side of the interlayer interface of the cable joint simulation assembly. In one embodiment, the most tip electrode of the multi-stage needle-needle electrode array on the left side of the multi-stage needle-needle electrode array is the high potential end, and the most blunt electrode of the multi-stage needle-needle electrode array on the right side of the multi-stage needle-needle electrode array is the zero potential end. In one embodiment, the voltage output by the high voltage power supply is a positive polarity voltage. In one embodiment, the cable is a crosslinked polyethylene cable. The surface discharge simulation device of the cable joint comprises a cable joint simulation assembly, a high-