Fireproof protection method and system for high-voltage cable joint

Abstract

The invention relates to a fireproof protection method and system for a high-voltage cable joint. The method comprises the following steps: respectively fixing the connecting ends of two high-voltage cables by using a first caliper and a second caliper; a first caliper and a second caliper are fixed to the inner wall of the connecting sleeve, and a closed space exists between the first caliper and the second caliper; a circulating pipeline is mounted on the connecting sleeve and penetrates through the closed space; a temperature sensor is installed in the closed space and located on the inner wall of the connecting sleeve or the circulating pipeline. An insulating layer is wrapped outside the connecting sleeve, the insulating layer simultaneously wraps part of the circulating pipeline, two independent channels exist in the circulating pipeline, and a connecting cable of the temperature sensor extends out of the closed space through one independent channel. According to the fireproof protection method and system for the high-voltage cable joint, the fireproof performance of the high-voltage cable joint is improved through an internal temperature detection mode and a cooling mode.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power safety, and in particular to a fire protection method and system for high-voltage cable joints. Background Art

[0002] Cable joints are important components in power transmission lines. They connect two sections of power transmission cables and provide insulation and waterproofing. Cable joints are prone to safety accidents due to construction quality, accessories quality, etc.

[0003] There are currently several fire prevention methods for cable joints, such as adjusting the connection method, using temperature sensors for monitoring, and using remote infrared image monitoring. All of these methods can reduce the probability of fire at cable joints to a certain extent. For example, adjusting the connection method improves fire resistance, but as the use time increases and overload occurs during use, the fire resistance will still gradually decrease.

[0004] Temperature abnormalities can be detected in time by using temperature sensors and remote infrared image monitoring. However, both point-condition temperature detection and remote temperature detection have the problem of incomplete temperature feedback. In addition, due to practical factors such as line limitations, the cable joints cannot be cooled under certain overload conditions. Summary of the invention

[0005] The present invention provides a fire protection method and system for a high-voltage cable joint, which improve the fire protection performance of the high-voltage cable joint through an internal temperature detection method and a temperature reduction method.

[0006] The above object of the present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a fire protection method for a high voltage cable joint, comprising: Fix the connection ends of the two high-voltage cables using a first clamp and a second clamp respectively; The first caliper and the second caliper are respectively fixed on the inner wall of the connecting sleeve, and a closed space exists between the first caliper and the second caliper; A circulation pipe is installed on the connecting sleeve, and the circulation pipe passes through the closed space; A temperature sensor is installed inside the closed space, and the temperature sensor is located on the inner wall of the connecting sleeve or on the circulation pipe; An insulating layer is wrapped around the outside of the connection sleeve, and the insulating layer also wraps part of the circulation pipe; There are two independent channels in the circulation pipeline, and the connecting cable of the temperature sensor extends out from the closed space through one of the independent channels.

[0007] In a possible implementation of the first aspect, the connecting sleeve includes a conductive layer, a first insulating layer, and a rigid layer arranged sequentially from inside to outside; The insulating layer is wrapped around the rigid layer.

[0008] In a possible implementation manner of the first aspect, the first clamp simultaneously abuts against an end portion of a connection end of the corresponding high-voltage cable.

[0009] In a possible implementation manner of the first aspect, the second clamp simultaneously abuts against an end portion of a connection end of the corresponding high-voltage cable.

[0010] In a second aspect, the present invention provides a fire protection system for a high voltage cable joint, comprising: Connecting sleeve; The first caliper and the second caliper are both fixed in the connecting sleeve, and the first caliper and the second caliper are used to fix the connecting ends of two high-voltage cables respectively, and there is a closed space between the first caliper and the second caliper; A circulation pipe is arranged on the connecting sleeve and passes through the enclosed space; The temperature sensor is arranged in the closed space, and the temperature sensor is located on the inner wall of the connecting sleeve or on the circulation pipe; An insulating layer, comprising a first portion disposed on the connecting sleeve and a second portion disposed on a portion of the circulating pipe; There are two independent channels in the circulation pipeline, and the connecting cable of the temperature sensor extends out from the closed space through one of the independent channels.

[0011] In a possible implementation manner of the second aspect, the connecting sleeve includes a conductive layer, a first insulating layer, and a rigid layer arranged sequentially from the inside to the outside; The insulating layer is wrapped around the rigid layer.

[0012] In a possible implementation manner of the second aspect, the first clamp includes a first annular portion wrapping a side wall of the corresponding high-voltage cable and a first contact plate abutting against an end of the corresponding high-voltage cable.

[0013] In a possible implementation manner of the second aspect, the second clamp includes a second annular portion wrapping a side wall of the corresponding high-voltage cable and a second contact plate abutting against an end of the corresponding high-voltage cable.

[0014] In a possible implementation of the second aspect, a cooling module connected to the circulation pipeline to form a loop is also included; The cooling module is also electrically connected to the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a fire protection system provided by the present invention.

[0016] Figure 2 It is a structural schematic diagram of a connecting sleeve provided by the present invention.

[0017] Figure 3 It is a structural schematic diagram of a first caliper provided by the present invention.

[0018] Figure 4 It is a structural schematic diagram of a second caliper provided by the present invention.

[0019] In the figure, 1. first caliper, 2. second caliper, 3. connecting sleeve, 4. circulation pipe, 5. temperature sensor, 6. insulating layer, 7. cooling module, 11. first annular part, 12. first contact plate, 21. second annular part, 22. second contact plate, 31. conductive layer, 32. first insulating layer, 33. rigid layer. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] The present invention discloses a fire protection method for high voltage cable joints. Figure 1 In some examples, the fire protection method for high voltage cable joints disclosed in the present invention comprises the following steps: Fix the connection ends of the two high-voltage cables using a first clamp 1 and a second clamp 2 respectively; The first caliper 1 and the second caliper 2 are respectively fixed on the inner wall of the connecting sleeve 3, and there is a closed space between the first caliper 1 and the second caliper 2; A circulation pipe 4 is installed on the connecting sleeve 3, and the circulation pipe 4 passes through the closed space; A temperature sensor 5 is installed inside the closed space, and the temperature sensor 5 is located on the inner wall of the connecting sleeve 3 or on the circulation pipe 4; An insulating layer 6 is wrapped around the outside of the connecting sleeve 3, and the insulating layer 6 also wraps a part of the circulation pipe 4; There are two independent channels in the circulation pipe 4, and the connection cable of the temperature sensor 5 extends out from the closed space through one of the independent channels.

[0022] Specifically, the connection ends of the two high-voltage cables are wrapped with the help of the first clamp 1 and the second clamp 2, and then the first clamp 1 and the second clamp 22 are respectively fixed on the inner wall of the connecting sleeve 3. At this time, with the help of the connecting sleeve 3, the first clamp 1 and the second clamp 22 are electrically connected.

[0023] While achieving electrical connection, a closed space can be formed between the first caliper 1 and the second caliper 22, in which a circulation pipe 4 and a temperature sensor 5 are arranged, and the closed space is also filled with a heat-conducting medium.

[0024] The temperature sensor 5 is used to detect the temperature of the heat-conducting medium.

[0025] The function of the circulation pipe 4 is to adjust the temperature of the heat transfer medium. The specific adjustment method is that the heat transfer medium in the circulation pipe 4 exchanges heat with the heat transfer medium outside the circulation pipe 4, so that the temperature of the heat transfer medium can be reduced.

[0026] The insulating layer 6 wraps the connecting sleeve 3 and a part of the circulation pipeline 4 to achieve insulation. The part of the circulation pipeline 4 here refers to the part of the circulation pipeline 4 located outside the connecting sleeve 3.

[0027] For some examples, see Figure 2 The connecting sleeve 3 includes a conductive layer 31, a first insulating layer 32 and a rigid layer 33 arranged in sequence from the inside to the outside, and the insulating layer 6 is wrapped on the rigid layer 33. The conductive layer 31 is used to realize the electrical connection between the first caliper 1 and the second caliper 22; the first insulating layer 32 is used to provide insulation performance, and the rigid layer 33 is used to provide protection performance.

[0028] In some examples, the first clamp 1 simultaneously abuts against the end of the connection end of the corresponding high-voltage cable.

[0029] In some examples, the second clamp 2 simultaneously abuts against the end of the corresponding connection end of the high voltage cable.

[0030] The present invention also discloses a fire protection system for high voltage cable joints, see Figure 1 , including a first clamp 1, a second clamp 2, a connecting sleeve 3, a circulation pipe 4, a temperature sensor 5 and an insulating layer 6. The first clamp 1 and the second clamp 2 are both fixed in the connecting sleeve 3. The first clamp 1 and the second clamp 2 are respectively used to fix the connecting ends of two high-voltage cables. There is a closed space between the first clamp 1 and the second clamp 2.

[0031] The circulation pipe 4 is arranged on the connection sleeve 3 and passes through the closed space, and its function is to cool down the heat-conducting medium in the closed space by heat exchange. The temperature sensor 5 is located in the closed space, and in addition, the temperature sensor 5 is located on the inner wall of the connection sleeve 3 or on the circulation pipe 4.

[0032] The insulating layer 6 comprises a first portion arranged on the connecting sleeve 3 and a second portion arranged on a portion of the circulating pipe 4. The function of the insulating layer 6 is to provide insulating performance.

[0033] There are two independent channels in the circulation pipeline 4, and the connection cable of the temperature sensor 5 extends from the closed space through one of the independent channels, so that the temperature sensor 5 can extend into the heat-conducting medium in the closed space.

[0034] For some examples, see Figure 2The connecting sleeve 3 includes a conductive layer 31, a first insulating layer 32 and a rigid layer 33 arranged in sequence from the inside to the outside, and the insulating layer 6 is wrapped on the rigid layer 33. The conductive layer 31 is used to realize the electrical connection between the first caliper 1 and the second caliper 22; the first insulating layer 32 is used to provide insulation performance, and the rigid layer 33 is used to provide protection performance.

[0035] For some examples, see Figure 3 The first clamp 1 includes a first annular portion 11 wrapping a side wall of a corresponding high-voltage cable and a first contact plate 12 abutting against an end of the corresponding high-voltage cable.

[0036] For some examples, see Figure 4 The second clamp 2 includes a second annular portion 21 wrapping the side wall of the corresponding high-voltage cable and a second contact plate 22 abutting against the end of the corresponding high-voltage cable.

[0037] For some examples, see Figure 1 , and also includes a cooling module 7 connected to the circulation pipe 4 to form a loop. The cooling module 7 includes a radiator, a circulation pump, a storage box and a controller. The radiator, the circulation pump, the storage box and the circulation pipe 4 form a loop. The circulation pump drives the heat transfer medium in the storage box to circulate in the loop. After the heat transfer medium is cooled at the radiator, it flows back to the storage box.

[0038] The controller in the cooling module 7 is electrically connected to the temperature sensor 5 , and the data obtained by the temperature sensor 5 is sent to the controller, which controls the circulation pump to achieve the cooling process described above.

[0039] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fire protection method for a high voltage cable joint, characterized in that: include: Using a first clamp (1) and a second clamp (2) to fix the connection ends of two high-voltage cables respectively; The first caliper (1) and the second caliper (2) are respectively fixed on the inner wall of the connecting sleeve (3), and a closed space exists between the first caliper (1) and the second caliper (2); A circulation pipe (4) is installed on the connecting sleeve (3), and the circulation pipe (4) passes through the closed space; A temperature sensor (5) is installed inside the closed space, wherein the temperature sensor (5) is located on the inner wall of the connecting sleeve (3) or on the circulation pipe (4); An insulating layer (6) is wrapped around the outside of the connecting sleeve (3), and the insulating layer (6) also wraps a portion of the circulation pipe (4); There are two independent channels in the circulation pipeline (4), and the connection cable of the temperature sensor (5) extends out from the closed space through one of the independent channels.

2. The fire protection method for high voltage cable joints according to claim 1, characterized in that: The connecting sleeve (3) comprises a conductive layer (31), a first insulating layer (32) and a rigid layer (33) which are sequentially arranged from the inside to the outside; The insulating layer (6) is wrapped on the rigid layer (33).

3. The fire protection method for high voltage cable joints according to claim 1, characterized in that: The first clamp (1) simultaneously abuts against the end of the connection end of the corresponding high-voltage cable.

4. The fire protection method for high voltage cable joints according to claim 1 or 3, characterized in that: The second clamp (2) simultaneously abuts against the end of the connection end of the corresponding high-voltage cable.

5. A fire protection system for high voltage cable joints, characterized in that: include: Connecting sleeve (3); The first caliper (1) and the second caliper (2) are both fixed in the connecting sleeve (3); the first caliper (1) and the second caliper (2) are respectively used to fix the connecting ends of two high-voltage cables; and a closed space exists between the first caliper (1) and the second caliper (2); A circulation pipe (4) is provided on the connecting sleeve (3) and passes through the closed space; A temperature sensor (5) is disposed in the closed space, and the temperature sensor (5) is located on the inner wall of the connecting sleeve (3) or on the circulation pipe (4); An insulating layer (6) comprising a first portion provided on the connecting sleeve (3) and a second portion provided on a portion of the circulation pipe (4); There are two independent channels in the circulation pipeline (4), and the connection cable of the temperature sensor (5) extends out from the closed space through one of the independent channels.

6. The fire protection system for high voltage cable joints according to claim 5, characterized in that: The connecting sleeve (3) comprises a conductive layer (31), a first insulating layer (32) and a rigid layer (33) which are sequentially arranged from the inside to the outside; The insulating layer (6) is wrapped on the rigid layer (33).

7. The fire protection system for high voltage cable joints according to claim 5, characterized in that: The first clamp (1) comprises a first annular portion (11) wrapping around a side wall of a corresponding high-voltage cable and a first contact plate (12) abutting against an end of the corresponding high-voltage cable.

8. The fire protection system for high voltage cable joints according to claim 5 or 7, characterized in that: The second clamp (2) comprises a second annular portion (21) wrapping around the side wall of the corresponding high-voltage cable and a second contact plate (22) abutting against the end of the corresponding high-voltage cable.

9. The fire protection system for high voltage cable joints according to claim 5, characterized in that: It also includes a cooling module (7) connected to the circulation pipeline (4) to form a loop; The cooling module (7) is also electrically connected to the temperature sensor (5).

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