CN115912002A - Fireproof method for intermediate joint of high-voltage cable - Google Patents
Fireproof method for intermediate joint of high-voltage cable Download PDFInfo
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- CN115912002A CN115912002A CN202211354450.1A CN202211354450A CN115912002A CN 115912002 A CN115912002 A CN 115912002A CN 202211354450 A CN202211354450 A CN 202211354450A CN 115912002 A CN115912002 A CN 115912002A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a fire prevention method for a high-voltage cable intermediate joint, which comprises a fire prevention joint, wherein the fire prevention joint comprises at least two independent cables, a cable A, a cable B, a connecting pipe, a transition intermediate joint, a copper conductor, a shielding layer, a protective sleeve and a semi-conducting layer; according to the fireproof method for the high-voltage cable intermediate joint, the overall strength of the cable intermediate joint is enhanced through the fireproof joint design, the cable fireproof sealing filler is arranged in the protective sleeve, external heat can be isolated, and the high-temperature deformation and spontaneous combustion phenomena generated when the cable is subjected to high-temperature attack on the intermediate joint part are avoided; the connecting pipe with the conical design is matched with the intermediate joint for transition to be connected with the copper conductor, so that the electric field of the cable joint part can be uniform, the current resistance is reduced, and the temperature effect of the cable intermediate joint part is further effectively reduced.
Description
Technical Field
The invention relates to the technical field of cable protection, in particular to a fireproof method for a middle joint of a high-voltage cable.
Background
The cable terminal and the intermediate joint are important parts in a power transmission and transformation cable line, and have the functions of dispersing an electric field at the outer shielding cut-off part of the cable terminal, protecting a cable from being punctured, insulating the inside and the outside, preventing water and the like. More than 60% of accidents in the cable line are caused by accessories, so the quality of the connector accessories plays an important role in the safety and reliability of the whole power transmission and transformation.
In the process of cable line power transmission, a certain current resistance exists in the cable line, electric energy is converted into heat energy due to resistance factors in the power transmission link, so that the cable generates certain heat, meanwhile, a large number of cable joints exist in the cable line, and the current resistance is increased due to the problems of cable joint insulation strength, installation tightness degree, contact degree and the like, so that the temperature of the cable is abnormally increased; this results in the cable joint being more easily damaged than other portions of the cable, thereby triggering various cable accidents, and a fire-proof method for the intermediate joint of the high-voltage cable is proposed for the connection installation of the intermediate joint of the cable.
Disclosure of Invention
Therefore, the invention provides a fireproof method for a high-voltage cable intermediate joint, which is used for overcoming the defects in the prior art.
The invention provides a fireproof method for a high-voltage cable intermediate joint, which comprises the following steps: the fireproof joint comprises at least two independent cables, a cable A, a cable B, a connecting pipe, a transition intermediate joint, a copper conductor, a shielding layer, a protective sleeve and a semi-conducting layer; the connecting pipe comprises two wire cores which are used for being connected with the cable A and the cable B respectively, one end of each connecting pipe is provided with the intermediate joint for transition, one end of each intermediate joint for transition is connected with the left end and the right end of the copper conductor respectively, the surface of the connecting pipe is wrapped with a semi-conducting layer, and the shielding layer is sleeved on the peripheries of each intermediate joint for transition and the copper conductor, and the preparation method comprises the following steps:
s1: cable pre-cleaning the cable A and the cable B, peeling and cutting the cable to an insulating layer, polishing the insulating layer with insulating abrasive paper to be smooth, and enabling the cable A and the cable B to leak out of part of cable cores;
s2: respectively pressing the exposed front ends of the wire cores of the cable A and the cable B into corresponding connecting pipes, wherein the connecting pipes are designed in a conical shape;
s3: uniformly coating a layer of silicone grease inside an insulating layer, a semi-conducting layer and a transition intermediate joint of the cable;
s4: respectively installing intermediate joints for transition at one end of each connecting pipe;
s5: selecting a section of copper conductor with the same specification as the cable A and the cable B, and respectively crimping the section of copper conductor with cables (the cable A and the cable B) at two ends through two intermediate joints for transition so as to realize conductor connection;
s6: wrapping a semi-conductive belt on the outer surfaces of the intermediate joint for transition and the connecting pipe to realize semi-conductive layers of the cable A and the cable B;
s7: wrapping a shielding net outside the semi-conductive layer of S6 to realize a shielding layer;
s8: and after S1-S7 preparation is finished, sleeving the protective sleeve outside the fireproof connector, and injecting filler into the protective sleeve for sealing.
Furthermore, the cable A and the cable B are made of the same material and sequentially comprise an outer sheath, a copper shielding belt, a semi-conducting layer, an insulating layer and a wire core from outside to inside.
Further, the semiconductive tape in step S6 is a semiconductive water-blocking tape, and the shielding mesh in step S7 is a copper shielding tape.
Further, the inner filler of the protective sleeve is a cable fireproof sealing filler.
Further, the intermediate joint for transition is an aluminum-copper integrated terminal transition intermediate joint.
According to the fireproof method for the high-voltage cable intermediate joint, the overall strength of the cable intermediate joint is enhanced through the fireproof joint design, the cable fireproof sealing filler is arranged in the protective sleeve, external heat can be isolated, and the high-temperature deformation and spontaneous combustion phenomena generated when the cable is subjected to high-temperature attack on the intermediate joint part are avoided; the connecting pipe with the conical design is matched with the intermediate joint for transition to be connected with the copper conductor, so that the electric field of the cable joint part can be uniform, the current resistance is reduced, and the temperature effect of the cable intermediate joint part is further effectively reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of a fireproof joint in the fireproof method for the intermediate joint of the high-voltage cable according to the present invention;
fig. 2 is an exploded view of a fireproof joint in the fireproof method for the intermediate joint of the high-voltage cable according to the present invention;
fig. 3 is a schematic view of an internal cross-sectional structure of a fireproof joint in the method for preventing fire of an intermediate joint of a high-voltage cable according to the present invention.
In the figure: the cable comprises a cable A, a cable B, a connecting pipe 3, a transition intermediate joint 4, a copper conductor 5, a shielding layer 6, a protective sleeve 7, a semi-conducting layer 8, a wire core 9 and a filler 10.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
The fire-proof method for the intermediate joint of the high-voltage cable comprises the fire-proof joint, wherein the fire-proof joint comprises at least two independent cables, namely a cable A and a cable B, a connecting pipe 3, a transition intermediate joint 4, a copper conductor 5, a shielding layer 6, a protective sleeve 7 and a semi-conducting layer 8; the connecting pipe 3 comprises two wire cores 9 which are used for being connected with the cable A and the cable B respectively, one end of each connecting pipe 3 is provided with the intermediate joint 4 for transition respectively, one end of each intermediate joint 4 for transition is connected with the left end and the right end of the copper conductor 5 respectively, the surface of the connecting pipe is wrapped with a semi-conducting layer 8, and the shielding layer 6 is sleeved on the peripheries of each intermediate joint 4 for transition and the copper conductor 5, and the preparation method comprises the following steps: s1: cable pre-cleaning the cable A and the cable B, stripping and cutting the cable to an insulating layer, polishing the cable A and the cable B by using insulating abrasive paper to be smooth, and enabling the cable A and the cable B to leak out of part of the wire core 9; s2: respectively pressing the front ends of the exposed wire cores 9 of the cable A and the cable B into corresponding connecting pipes 3, wherein the connecting pipes 3 are in a conical design; s3: uniformly coating a layer of silicone grease in the insulating layer, the semi-conducting layer and the transition intermediate joint 4 of the cable; s4: the intermediate joints 4 for transition are respectively arranged at one end of each connecting pipe 3; s5: selecting a section of copper conductor 5 with the same specification as the cable A and the cable B, and respectively crimping the section of copper conductor 5 with cables (the cable A and the cable B) at two ends through two intermediate joints 4 for transition so as to realize conductor connection; s6: wrapping a semi-conductive belt on the outer surfaces of the intermediate joint 4 for transition and the connecting pipe 3 to form a semi-conductive layer 8 of the cable A and the cable B; s7: a shielding net is wound outside the semi-conducting layer 8 of the S6 to realize the shielding layer 6; s8: and after S1-S7 preparation is finished, sleeving the protective sleeve 7 outside the fireproof joint, and injecting a filler 10 into the protective sleeve for sealing.
The first embodiment,
A method for preventing fire of a middle joint of a high-voltage cable according to fig. 1 to 3, comprising the following steps:
s1: cable pre-cleaning the cable A and the cable B, stripping and cutting the cable to an insulating layer, polishing the cable A and the cable B by using insulating abrasive paper to be smooth, and enabling the cable A and the cable B to leak out of part of the wire core 9; the lengths of the wire cores 9 of the cable A and the cable B are consistent and are both 5-15cm, and the chamfer angle of each insulating layer is 1 multiplied by 45 degrees (non-pencil head shape);
s2: the length of the connecting pipe 3 is consistent with that of the wire core 9; the front ends of the wire cores 9 exposed out of the cable A and the cable B are respectively pressed into the corresponding connecting pipes 3, and one sides of the connecting pipes 3 are designed to be in a (conical) pencil head shape;
s3: uniformly coating a layer of silicone grease with the thickness of 5mm-1cm in the insulating layer, the semi-conducting layer and the transition intermediate joint 4 of the cable;
s4: the intermediate joint 4 for transition is an aluminum-copper integrated terminal transition intermediate joint, and the intermediate joint 4 for transition (aluminum end) is respectively arranged at one end of each connecting pipe 3;
s5: selecting a section of copper conductor 5 with the same specification as the cable A and the cable B, wherein the copper conductor 5 is 1400mm & lt 2 & gt, and the length of the copper conductor 5 is 20-30cm; and are respectively pressed together with cables (a cable A and a cable B) at two ends through two intermediate joints 4 (copper ends) for transition so as to realize conductor connection;
s6: semi-conducting belts are wound on the outer surfaces of the intermediate joint 4 for transition and the connecting pipe 3 to realize the semi-conducting layers 8 of the cable A and the cable B, the semi-conducting belts are wound at two ends of the intermediate joint 4 for transition into wound bodies with the diameter not less than that of the end part of the intermediate joint 4 for transition, and then the semi-conducting belts are wound to the other end of the joint in an overlapping mode by 1/3 to be overlapped with the semi-conducting layers of the cable;
s7: a shielding net is wound outside the semi-conducting layer 8 of the S6 to realize the shielding layer 6;
s8: and after S1-S7 preparation is finished, sleeving the protective sleeve 7 outside the fireproof joint, and injecting a filler 10 into the protective sleeve for sealing.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A fire prevention method for a high-voltage cable intermediate joint comprises a fire prevention joint and is characterized in that the fire prevention joint comprises at least two independent cables, a cable A, a cable B, a connecting pipe, a transition intermediate joint, a copper conductor, a shielding layer, a protective sleeve and a semi-conducting layer; the connecting pipe comprises two wire cores which are used for being connected with the cable A and the cable B respectively, one end of each connecting pipe is provided with the intermediate joint for transition, one end of each intermediate joint for transition is connected with the left end and the right end of the copper conductor respectively, the surface of the connecting pipe is wrapped with a semi-conducting layer, and the shielding layer is sleeved on the peripheries of each intermediate joint for transition and the copper conductor, and the preparation method comprises the following steps:
s1: pre-cleaning the cable A and the cable B, peeling and cutting the cable to an insulating layer, polishing the insulating layer with insulating abrasive paper to be smooth, and enabling the cable A and the cable B to leak out of part of cable cores;
s2: respectively pressing the exposed front ends of the wire cores of the cable A and the cable B into corresponding connecting pipes, wherein the connecting pipes are designed in a conical shape;
s3: uniformly coating a layer of silicone grease inside an insulating layer, a semi-conducting layer and a transition intermediate joint of the cable;
s4: respectively installing intermediate joints for transition at one end of each connecting pipe;
s5: selecting a section of copper conductor with the same specification as the cable A and the cable B, and respectively crimping the section of copper conductor with cables (the cable A and the cable B) at two ends through two intermediate joints for transition so as to realize conductor connection;
s6: wrapping a semi-conductive belt on the outer surfaces of the intermediate joint for transition and the connecting pipe to realize semi-conductive layers of the cable A and the cable B;
s7: wrapping a shielding net outside the semi-conductive layer of S6 to realize a shielding layer;
s8: and after S1-S7 preparation is finished, sleeving the protective sleeve outside the fireproof connector, and injecting filler into the protective sleeve for sealing.
2. The fire protection method for the intermediate joint of the high-voltage cable according to claim 1, wherein the cable A and the cable B are made of the same material and sequentially comprise an outer sheath, a copper shielding tape, a semi-conducting layer, an insulating layer and a wire core from outside to inside.
3. The method for preventing fire of an intermediate joint of a high-voltage cable according to claim 1, wherein the semi-conductive tape in step S6 is a semi-conductive water-blocking tape, and the shielding net in step S7 is a copper shielding tape.
4. The method for preventing fire of the intermediate joint of the high-voltage cable from being damaged according to claim 1, wherein the filling material in the protective sleeve is a cable fire-proof sealing filling material.
5. The method of claim 1, wherein the intermediate joint for transition is an aluminum-copper integrated terminal transition intermediate joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211354450.1A CN115912002A (en) | 2022-10-31 | 2022-10-31 | Fireproof method for intermediate joint of high-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211354450.1A CN115912002A (en) | 2022-10-31 | 2022-10-31 | Fireproof method for intermediate joint of high-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115912002A true CN115912002A (en) | 2023-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211354450.1A Pending CN115912002A (en) | 2022-10-31 | 2022-10-31 | Fireproof method for intermediate joint of high-voltage cable |
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| Country | Link |
|---|---|
| CN (1) | CN115912002A (en) |
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- 2022-10-31 CN CN202211354450.1A patent/CN115912002A/en active Pending
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