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CN-224231893-U - Cable accessory interface breakdown voltage testing device

CN224231893UCN 224231893 UCN224231893 UCN 224231893UCN-224231893-U

Abstract

The utility model discloses a cable accessory interface breakdown voltage testing device. The cable accessory interface breakdown voltage testing device comprises a conductor, a first shrinkage tube, a second shrinkage tube, a first electrode, a second electrode and voltage detection equipment. The first shrinkage tube is shrunk and then coated on the outer wall of the conductor. The second shrink tube is covered on the outer wall of the first shrink tube after shrinking. The first electrode and the second electrode are arranged between the first shrinkage tube and the second shrinkage tube, and the first electrode and the second electrode are arranged at intervals along the axial direction. The voltage detection device is connected with the first electrode and the second electrode respectively. The utility model can rapidly, economically, effectively and accurately detect the breakdown voltage of the cable accessory interface.

Inventors

  • Wei Yeqiang
  • XU QIDONG
  • ZHANG LONG
  • KANG DAN
  • HU XIFU

Assignees

  • 深圳市沃尔电力技术有限公司
  • 深圳市沃尔核材股份有限公司

Dates

Publication Date
20260512
Application Date
20250524

Claims (13)

  1. 1. A cable accessory interface breakdown voltage testing device, comprising: A conductor (11); The first shrinkage tube (12) is shrunk and then coated on the outer wall of the conductor (11); the second shrinkage tube (13) is shrunk and then coated on the outer wall of the first shrinkage tube (12); A first electrode (14) and a second electrode (15), wherein the first electrode (14) and the second electrode (15) are arranged between the first shrinkage tube (12) and the second shrinkage tube (13), and the first electrode (14) and the second electrode (15) are arranged at intervals along the axial direction; And a voltage detection device connected to the first electrode (14) and the second electrode (15), respectively.
  2. 2. A cable accessory interface breakdown voltage testing apparatus as claimed in claim 1, wherein, The first shrinkage tube (12) is a heat shrinkage tube, and the second shrinkage tube (13) is a heat shrinkage tube or a cold shrinkage tube; Or, the first shrinkage tube (12) is a cold shrinkable material tube, and the second shrinkage tube (13) is a heat shrinkage tube or a cold shrinkage tube.
  3. 3. A cable accessory interface breakdown voltage testing device as claimed in claim 2, characterized in that the first shrink tube (12) and the second shrink tube (13) are of different materials.
  4. 4. A cable accessory interface breakdown voltage testing device according to claim 1, characterized in that grease is provided between the first electrode (14) and the first shrink tube (12), the second shrink tube (13), and between the second electrode (15) and the first shrink tube (12), the second shrink tube (13).
  5. 5. A cable accessory interface breakdown voltage testing device as claimed in claim 4, wherein the grease completely covers the portions of the first electrode (14) and the second electrode (15) located in the first shrink tube (12) and the second shrink tube (13).
  6. 6. The cable accessory interface breakdown voltage testing apparatus of claim 1, wherein: The first electrode (14) includes a first head (141) and a first connection portion (142) connected to the first head (141); The second electrode (15) comprises a second head (151) and a second connection portion (152) connected to the second head (151); The first head (141) and the second head (151) are positioned between the first shrinkage tube (12) and the second shrinkage tube (13), and the first head (141) and the second head (151) are arranged at intervals; One ends of the first connecting part (142) and the second connecting part (152) are positioned between the first shrinkage tube (12) and the second shrinkage tube (13), and the other ends of the first connecting part (142) and the second connecting part are respectively connected with the voltage detection equipment.
  7. 7. The device for testing the breakdown voltage of the cable accessory interface as claimed in claim 6, wherein the edges of the first head (141) and the second head (151) are rounded.
  8. 8. A cable accessory interface breakdown voltage testing device according to claim 7, characterized in that the first electrode (14) and the second electrode (15) are aluminium foils.
  9. 9. The cable accessory interface breakdown voltage testing device according to claim 1, wherein the first shrinkage tube (12) and the second shrinkage tube (13) are made of rubber, and 10% stretching strength of the first shrinkage tube (12) and the second shrinkage tube (13) is 0.1-0.5MPa.
  10. 10. A cable accessory interface breakdown voltage testing device according to claim 1, characterized in that the conductor (11) is one of iron, aluminum, copper, iron alloy, aluminum alloy or copper alloy.
  11. 11. A cable accessory interface breakdown voltage testing apparatus as claimed in any one of claims 1-10, wherein, Defining the thickness of the first shrink tube (12) after shrinkage as a, in an unused state, the first shrink tube (12) has a first inner diameter A1 before shrinkage, a second inner diameter A2 after shrinkage, an outer diameter of the conductor (11) as B, and the second shrink tube (13) has a third inner diameter C1 before shrinkage and a fourth inner diameter C2 after shrinkage; The following relationship is satisfied between the first inner diameter A1, the second inner diameter A2, and the outer diameter B of the conductor (11): A1> B and A2< B; The third inner diameter C1, the fourth inner diameter C2 and the outer diameter B thickness a of the conductor (11) satisfy the following relationship: c1> B+a and C2< B.
  12. 12. A cable accessory interface breakdown voltage testing apparatus as recited in claim 11, wherein, A2=B-10mm; C2=B-10mm。
  13. 13. A cable accessory interface breakdown voltage testing device as claimed in claim 12, wherein the thickness a = 1mm.

Description

Cable accessory interface breakdown voltage testing device Technical Field The utility model relates to the technical field of power cable accessories, in particular to a cable accessory interface breakdown voltage testing device. Background With the development of the economy and society of China, the total electricity consumption of the country is further improved, and the consumption of corresponding power cable accessories is further increased. However, because of the current multi-purpose high-voltage transmission mode of power transmission, the cable accessories are often faced with larger electric stress, so that the cable accessories are extremely easy to break down, the power transmission is interrupted, and the life and production are affected. At present, a cable accessory is generally formed by coating conductors with multiple layers of materials, breakdown generally occurs between interfaces of the multiple layers of materials, multiple layers of materials are required to be stacked on a plane in order to ensure the accuracy of breakdown voltage measurement, and a pressurizing device is used for pressurizing the multiple layers of materials so as to reduce gaps among the multiple layers of materials, thereby ensuring the accuracy of breakdown voltage measurement. Disclosure of utility model The utility model mainly aims to provide a cable accessory interface breakdown voltage testing device, which comprises: A conductor; The first shrinkage tube is shrunk and then coated on the outer wall of the conductor; The second shrinkage tube is shrunk and then coated on the outer wall of the first shrinkage tube; The first electrode and the second electrode are arranged between the first shrinkage tube and the second shrinkage tube, and the first electrode and the second electrode are arranged at intervals along the axial direction; And the voltage detection device is respectively connected with the first electrode and the second electrode. Optionally, in an embodiment of the present utility model, the first shrink tube is a heat shrink tube, and the second shrink tube is a heat shrink tube or a cold shrink tube; Or the first shrinkage tube is a cold shrinkable material tube, and the second shrinkage tube is a heat shrinkage tube or a cold shrinkage tube. Optionally, in an embodiment of the present utility model, the first shrink tube and the second shrink tube are of different materials. Optionally, in an embodiment of the present utility model, grease is disposed between the first electrode and the first shrink tube and the second shrink tube, and between the second electrode and the first shrink tube and the second shrink tube. Alternatively, in an embodiment of the present utility model, the grease completely covers portions of the first electrode and the second electrode that are located in the first shrink tube and the second shrink tube. Optionally, in an embodiment of the present utility model, the first electrode includes a first head and a first connection portion connected to the first head; The second electrode comprises a second head and a second connecting part connected with the second head; The first head and the second head are positioned between the first shrinkage pipe and the second shrinkage pipe, and the first head and the second head are arranged at opposite intervals; One ends of the first connecting part and the second connecting part are positioned between the first shrinkage tube and the second shrinkage tube, and the other ends of the first connecting part and the second connecting part are respectively connected with the voltage detection equipment. Optionally, in an embodiment of the present utility model, edges of the first head and the second head are rounded. Optionally, in an embodiment of the present utility model, the first electrode and the second electrode are aluminum foils. Optionally, in an embodiment of the present utility model, the first shrinkage tube and the second shrinkage tube are made of rubber, and 10% stretching strength of the first shrinkage tube and the second shrinkage tube is 0.1-0.5MPa. Optionally, in an embodiment of the present utility model, the conductor is one of iron, aluminum, copper, an iron alloy, an aluminum alloy, or a copper alloy. Alternatively, in one embodiment of the utility model, defining a thickness of the first shrink tube after shrinkage as a, in an unused state, the first shrink tube has a first inner diameter A1 before shrinkage, a second inner diameter A2 after shrinkage, an outer diameter of the conductor as B, the second shrink tube has a third inner diameter C1 before shrinkage, and a fourth inner diameter C2 after shrinkage; the following relationship is satisfied between the first inner diameter A1, the second inner diameter A2, and the conductor outer diameter B: A1> B and A2< B; the third inner diameter C1, the fourth inner diameter C2 and the conductor outer diameter B thickness a satisfy the following relationship: