一种35kV单芯电力电缆交叉互联接线系统

Abstract

本实用新型属于高压电力电缆线路保护技术应用领域，具体涉及一种35kV单芯电力电缆交叉互联接线系统，本实用新型将A相电力电缆、B相电力电缆、C相电力电缆分别分为三段等长的第一段电缆、第二段电缆、第三段电缆，通过明确A相电力电缆、B相电力电缆、C相电力电缆各段在第一电缆中间箱、第二电缆中间箱、第一交叉互联接地箱、第二交叉互联接地箱的金属屏蔽层连接关系以及接地要求，形成了一个交叉互联单元，该接线系统接线结构和接线方法清晰，确保接线正确，有效降低金属屏蔽层中的感应电压，从而减少金属屏蔽层感应电流，降低电缆损耗，确保人身与设备安全，大大降低电缆故障的发生。

Claims

1. A 35 kV single core power cable cross-bonding system, characterized by: Includes A-phase power cable (100), B-phase power cable (200), C-phase power cable (300), first cable intermediate box (400), second cable intermediate box (500), first cross-interconnection grounding box (600), and second cross-interconnection grounding box (700); The A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are respectively divided into three equal-length sections: the first section, the second section, and the third section. The first and second sections of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are electrically connected and insulated within the first cable intermediate box (400). The second and third sections of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are electrically connected and insulated in the second cable intermediate box (500); The metal shielding layers of the first section of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) at the substation side and the metal shielding layers of the third section of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) at the user side are respectively grounded by grounding copper busbars. The first cross-interconnection grounding box (600) is provided with a first cross-interconnection board (601), a second cross-interconnection board (602) and a third cross-interconnection board (603) arranged in a cross-connection manner. The second cross-interconnection board (602) and the third cross-interconnection board (603) are arranged parallel to each other from left to right. The second cross-interconnection grounding box (700) is provided with a fourth cross-interconnection board (701), a fifth cross-interconnection board (702) and a sixth cross-interconnection board (703) arranged in a cross-connection configuration. The fifth cross-interconnection board (702) and the sixth cross-interconnection board (703) are arranged parallel to each other from left to right. Inside the first cable intermediate box (400), the metal shielding layer connection a1 of the first cable terminal of the A-phase power cable (100) and the metal shielding layer connection c2 of the second cable terminal of the C-phase power cable (300) are respectively connected to the lower end and the upper end of the first cross-connection plate (601); the metal shielding layer connection a2 of the second cable terminal of the A-phase power cable (100) and the metal shielding layer connection b1 of the first cable terminal of the B-phase power cable (200) are respectively connected to the upper end and the lower end of the second cross-connection plate (602); the metal shielding layer connection b2 of the second cable terminal of the B-phase power cable (200) and the metal shielding layer connection c1 of the first cable terminal of the C-phase power cable (300) are respectively connected to the upper end and the lower end of the third cross-connection plate (603); Inside the second cable intermediate box (500), the metal shielding connection a3 of the second cable terminal of the A-phase power cable (100) and the metal shielding connection c4 of the third cable terminal of the C-phase power cable (300) are respectively connected to the lower end and the upper end of the fourth cross-connection plate (701); the metal shielding connection a4 of the third cable terminal of the A-phase power cable (100) and the metal shielding connection b3 of the second cable terminal of the B-phase power cable (200) are respectively connected to the upper end and the lower end of the fifth cross-connection plate (702); the metal shielding connection b4 of the third cable terminal of the B-phase power cable (200) and the metal shielding connection c3 of the second cable terminal of the C-phase power cable (300) are respectively connected to the upper end and the lower end of the sixth cross-connection plate (703); After the lower ends of the first cross-connection board (601), the second cross-connection board (602) and the third cross-connection board (603) are connected to their respective metal shield overvoltage protectors, they are grounded to the outer shell of the first cross-connection grounding box (600) and the earth. The lower ends of the fourth cross-connection board (701), the fifth cross-connection board (702) and the sixth cross-connection board (703) are connected to their respective metal shielding overvoltage protectors and then grounded to the outer shell of the second cross-connection grounding box (700) and the earth.

2. The 35 kV single-core power cable cross-bonding system of claim 1, wherein: The metal shielding layers of the terminals of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are connected to the grounding copper busbar in a star-shaped grounding configuration.

3. The 35 kV single core power cable cross-bonding system of claim 1, wherein: The metal shielding overvoltage protector is model LHQ-35.

4. The 35 kV single core power cable cross-bonding system of claim 1, wherein: The first cable intermediate box (400) and the first cross-interconnection grounding box (600) are connected by wiring cables (800), and the second cable intermediate box (500) and the second cross-interconnection grounding box (700) are connected by wiring cables (800).

5. The 35 kV single-core power cable cross-bonding system of claim 4, wherein: The wiring cable (800) is a low-voltage cable, model ZR-VVR-0.6 / 1kV-1*70mm 2 .

6. The 35 kV single core power cable cross-bonding system of claim 4, wherein: The wiring cable (800) is connected to the copper braids led out from the metal shielding layer of the cable terminals of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300).

7. The 35 kV single-core power cable cross-bonding system of claim 1, wherein: The grounding copper busbars include substation-side grounding copper busbars and user-side grounding copper busbars.

8. The 35 kV single-core power cable cross-bonding system of claim 1, wherein: The first and second sections of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are connected to each other in the first cable intermediate box (400) via insulating joints (900). The second and third sections of the A-phase power cable (100), B-phase power cable (200), and C-phase power cable (300) are connected to each other in the second cable intermediate box (500) via insulating joints (900).

9. The 35 kV single-core power cable cross-bonding system of claim 1, wherein: The first cable intermediate box (400) and the second cable intermediate box (500) are model YDFW-40.5-4 / 800, with one inlet and one outlet.

10. The 35 kV single-core power cable cross-bonding system of claim 1, wherein: The first cross-interconnection grounding box (600) and the second cross-interconnection grounding box (700) are model JBJDX-35.

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