CN113241720B - Explosion-proof device for high-voltage cable intermediate joint and use method thereof - Google Patents
Explosion-proof device for high-voltage cable intermediate joint and use method thereof Download PDFInfo
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- CN113241720B CN113241720B CN202110520129.5A CN202110520129A CN113241720B CN 113241720 B CN113241720 B CN 113241720B CN 202110520129 A CN202110520129 A CN 202110520129A CN 113241720 B CN113241720 B CN 113241720B
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Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/003—Filling materials, e.g. solid or fluid insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/013—Sealing means for cable inlets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
- H02G15/043—Cable-end sealings with end caps, e.g. sleeve closed at one end
- H02G15/046—Cable-end sealings with end caps, e.g. sleeve closed at one end with bores or protruding portions allowing passage of cable conductors
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Cable Accessories (AREA)
Abstract
The invention relates to an explosion-proof device for a high-voltage cable intermediate joint and a using method thereof. The explosion-proof device comprises an explosion-proof shell main body; the two ends of the explosion-proof shell main body are symmetrically provided with a pressure relief port, a cable port and a ground wire port; the end parts of the pressure relief port, the cable port and the ground wire port are respectively provided with a pressure relief cover, a cable end part sealing hardware fitting and a ground wire end part sealing hardware fitting. The explosion-proof device for the intermediate joint of the high-voltage cable reduces the occurrence of joint explosion accidents and simultaneously avoids potential safety hazards of the intermediate joint of the cable in the using process; the size of the anti-explosion connector can be about 400mm while the anti-explosion effect is ensured, the anti-explosion connector can be well matched with other structures of a high-pressure connector, and the actual use requirement is met; finally, the invention ensures the sealing performance and high stability while realizing the explosion-proof function.
Description
Technical Field
The invention relates to an explosion-proof device for a high-voltage cable intermediate joint and a using method thereof, belonging to the technical field of high-voltage cable joints.
Background
In recent years, with the rapid development of power grid construction in China, the demand of high-voltage power cables is rapidly increased, the quantity of the demand of high-voltage cable joints is continuously increased, the high-voltage cable joints are influenced by factors such as human factors, construction and operation environments, many combustion and explosion accidents occur at home and abroad every year, and the generated destructive power can not only cause power failure and outage of the line, but also cause serious damage to cable lines, power facilities and personnel in peripheral operation, even cause more serious secondary accidents, and the loss caused by the secondary accidents cannot be estimated.
At present, cable connectors in the market are made of glass fiber reinforced plastic, AB waterproof glue is filled in the cable connectors, and the AB waterproof glue and the cable connectors are bonded into a whole;
in addition, the explosion-proof device in the prior art is too large in size (the diameter is usually 500-600 mm), can not be well matched with other structures of the high-pressure joint, and can not meet the actual use requirements.
Chinese patent publication No. CN209150699U discloses a high-voltage waterproof flame-retardant intermediate joint for an electric power system, which includes a conductor connecting pipe, an internal shielding metal sleeve, a rubber body, an insulating waterproof filling layer, a flame-retardant waterproof mixture and a copper shell; the invention has extremely high fire resistance while ensuring the aspects of waterproofness and tightness, and can reduce the hidden danger caused by the fire of a cable system. The product of the patent has certain waterproof and flame retardant functions, but does not have an explosion-proof function.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an explosion-proof device for a high-voltage cable intermediate joint.
The invention also provides a use method of the explosion-proof device for the high-voltage cable intermediate joint.
The invention adopts the following technical scheme:
an explosion-proof device for a high-voltage cable intermediate joint comprises an explosion-proof shell main body; the two ends of the explosion-proof shell main body are symmetrically provided with a pressure relief port, a cable port and a ground wire port; the end parts of the pressure relief port, the cable port and the ground wire port are respectively provided with a pressure relief cover, a cable end part sealing hardware fitting and a ground wire end part sealing hardware fitting; flame-retardant waterproof mixture layers are respectively filled between the cable end sealing hardware fitting and the cable and between the grounding wire end sealing hardware fitting and the grounding wire, and insulating waterproof filling layers are respectively arranged at the end part of the cable end sealing hardware fitting and the end part of the grounding wire end sealing hardware fitting; the explosion-proof shell main body consists of a left half box and a right half box; the left half box and the right half box are connected through bolts, and the left half box and the right half box are connected in a sealing mode. The design of the left half box and the right half box has better sealing performance and higher stability.
The explosion-proof shell is not filled with any filler, and when explosion occurs, high pressure quickly penetrates through the cavity and is released through the pressure relief port.
Preferably, the thickness of the pressure relief cover is 0.3-0.8 mm, and the thickness of the explosion-proof shell main body is 10-20 mm; the diameter of the explosion-proof shell main body is 350 mm-450 mm.
Preferably, the cable end sealing fitting and the grounding wire end sealing fitting are respectively provided with a flame-retardant waterproof mixture filling port, and a port cover is arranged at a port of the flame-retardant waterproof mixture filling port.
Preferably, the pressure relief cover is detachably arranged at the end part of the pressure relief opening. After explosion happens, the explosion-proof shell main body can be recycled after the explosion-out pressure relief cover is replaced, the use cost is reduced, the overhaul efficiency is improved, and cost resources are saved.
Preferably, the insulating waterproof filling layer is one or more of an adhesive tape and a heat shrinkable tube with insulating and waterproof properties; the flame-retardant waterproof mixture layer is a bi-component polyurethane coating. The two-component polyurethane coating is generally composed of isocyanate prepolymer (also called low molecular urethane polymer) and hydroxyl-containing resin, can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and the like according to the difference of the hydroxyl-containing components, and is filled with organic flame retardant (one or more of phosphorus, halogen and nitrogen) and inorganic flame retardant (one or more of antimonide, boride, aluminum hydroxide and magnesium hydroxide) and high molecular flame retardant, so that the two-component polyurethane coating has the performances of water resistance, flame retardance, corrosion resistance and high temperature resistance, has the oxygen index of not less than 30 percent, and plays the roles of water resistance and flame retardance.
Preferably, the material of the cable end sealing hardware fitting is one of aluminum magnesium alloy, stainless steel or high-strength PE material; the grounding wire end sealing hardware fitting is made of one of aluminum magnesium alloy, stainless steel or high-strength PE (polyethylene) materials; the pressure relief opening is made of one of aluminum magnesium alloy, stainless steel or high-strength PE materials.
The use method of the explosion-proof device for the high-voltage cable intermediate joint comprises the following steps:
sealing the left half box and the right half box, connecting the left half box and the right half box through bolts, and sleeving an explosion-proof shell main body on the outer side of a cable joint; the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting are connected with the cable port and the ground wire port respectively, a flame-retardant waterproof mixture is injected into the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting, and finally, the insulating waterproof filling layer is wound at the end parts of the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting.
The invention has the beneficial effects that:
the explosion-proof device for the intermediate joint of the high-voltage cable reduces the occurrence of joint explosion accidents and simultaneously avoids potential safety hazards of the intermediate joint of the cable in the using process; the size of the anti-explosion connector can be about 400mm while the anti-explosion effect is ensured, the anti-explosion connector can be well matched with other structures of a high-pressure connector, and the actual use requirement is met; finally, the invention ensures the sealing performance and high stability while realizing the explosion-proof function.
Drawings
FIG. 1 is a schematic structural diagram of an explosion-proof device for a high-voltage cable intermediate joint according to the present invention;
wherein: 1. explosion-proof shell main part, 2, the sealed gold utensil of earth connection line tip, 3, the sealed gold utensil of cable tip, 4, pressure release lid.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific examples, but not limited thereto, and the present invention is not described in detail and is in accordance with the conventional techniques in the art.
Example 1
As shown in fig. 1.
An explosion-proof device for a high-voltage cable intermediate joint comprises an explosion-proof shell main body 1; two ends of the explosion-proof shell main body 1 are symmetrically provided with a pressure relief port, a cable port and a ground wire port; the end parts of the pressure relief port, the cable port and the ground wire port are respectively provided with a pressure relief cover 4, a cable end part sealing hardware fitting 3 and a ground wire end part sealing hardware fitting 2; flame-retardant waterproof mixture layers are respectively filled between the cable end sealing hardware fitting 3 and the cable and between the grounding wire end sealing hardware fitting 2 and the grounding wire, and insulating waterproof filling layers are respectively arranged at the end part of the cable end sealing hardware fitting 3 and the end part of the grounding wire end sealing hardware fitting 2; the explosion-proof shell main body consists of a left half box and a right half box; the left half box and the right half box are connected through bolts, and the left half box and the right half box are connected in a sealing mode. The design of the left half box and the right half box has better sealing performance and higher stability.
The explosion-proof shell is not filled with any filler, and when explosion occurs, high pressure quickly penetrates through the cavity and is released through the pressure relief port.
Comparative example 1:
an intermediate joint of a common cable without an explosion-proof device.
The data obtained by performing the temperature monitoring at all times, partial discharge monitoring at all times, and water and explosion resistance tests on example 1 and comparative example 1 are shown in table 1:
table 1: comparative table for performance test of example 1 and comparative example 1
As can be seen from table 1, compared with comparative example 1, example 1 of the present invention has both waterproof and explosion-proof functions, and can solve the problem of damage to surrounding cable lines, power facilities, and personnel due to explosion caused by an emergency fault, thereby ensuring normal operation of the product in all aspects.
Example 2
The explosion-proof device for the high-voltage cable intermediate joint according to embodiment 1, further, the thickness of the pressure relief cover 4 is 0.5mm, and the thickness of the explosion-proof housing body 1 is 15mm; the diameter of the explosion-proof shell body 1 is 400mm.
Example 3
In the explosion-proof device for the intermediate joint of the high-voltage cable according to embodiment 1, further, the cable end sealing hardware fitting 3 and the grounding wire end sealing hardware fitting 2 are respectively provided with a flame-retardant waterproof mixture filling port, and a port cover is arranged at a port of the flame-retardant waterproof mixture filling port.
Example 4
In the explosion-proof device for the intermediate joint of the high-voltage cable according to embodiment 1, further, the pressure relief cover 4 is detachably disposed at an end of the pressure relief opening. After explosion occurs, the explosion-proof shell main body 1 can be recycled after the explosion-proof pressure relief cover 4 is replaced, the use cost is reduced, the overhaul efficiency is improved, and the cost resource is saved.
Example 5
The explosion-proof device for the intermediate joint of the high-voltage cable according to embodiment 1, further, the insulating waterproof filling layer is a heat-shrinkable tube having insulating and waterproof properties. The insulating waterproof filling layer plays a role in insulation and water resistance.
The flame-retardant waterproof mixture layer is a bi-component polyurethane coating. The double-component polyurethane coating is generally composed of isocyanate prepolymer (also called low molecular urethane polymer) and hydroxyl-containing resin, can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and other varieties according to the difference of the hydroxyl-containing components, and organic flame retardant (one or more of phosphorus, halogen and nitrogen) and inorganic flame retardant (one or more of antimonide, boride, aluminum hydroxide and magnesium hydroxide) and high molecular flame retardant are filled in the double-component polyurethane coating, so that the double-component polyurethane coating has the performances of water resistance, flame retardance, corrosion resistance and high temperature resistance, has the oxygen index of not less than 30 percent and plays the roles of water resistance and flame retardance.
The cable end sealing hardware fitting 3 is made of a high-strength PE material; the grounding wire end sealing hardware fitting 3 is made of a high-strength PE material; the pressure relief port 4 is made of a high-strength PE material.
Example 6
A method for using the explosion-proof device for the intermediate joint of the high-voltage cable according to any one of embodiments 1 to 5, comprising the following steps:
the left half box and the right half box are sealed and then connected through bolts, and the outer side of a cable joint is sleeved with an explosion-proof shell main body 1; the cable end part sealing hardware fitting 3 and the grounding wire end part sealing hardware fitting 2 are respectively connected at the cable port and the ground wire port through bolts, a flame-retardant waterproof mixture is injected into the cable end part sealing hardware fitting 3 and the grounding wire end part sealing hardware fitting 2, and finally, the insulating waterproof filling layer is wound on the end part of the cable end part sealing hardware fitting 3 and the grounding wire end part sealing hardware fitting 2.
Claims (5)
1. An explosion-proof device for a high-voltage cable intermediate joint is characterized by comprising an explosion-proof shell main body; the two ends of the explosion-proof shell main body are symmetrically provided with a pressure relief port, a cable port and a ground wire port; the end parts of the pressure relief port, the cable port and the ground wire port are respectively provided with a pressure relief cover, a cable end part sealing hardware fitting and a ground wire end part sealing hardware fitting; flame-retardant waterproof mixture layers are respectively filled between the cable end sealing hardware fitting and the cable and between the grounding wire end sealing hardware fitting and the grounding wire, and insulating waterproof filling layers are respectively arranged at the end part of the cable end sealing hardware fitting and the end part of the grounding wire end sealing hardware fitting; the explosion-proof shell main body consists of a left half box and a right half box; the left half box and the right half box are connected through bolts and are in sealing connection; the thickness of the pressure relief cover is 0.3-0.8 mm, and the thickness of the explosion-proof shell main body is 10-20 mm; the diameter of the explosion-proof shell main body is 350 mm-450 mm; the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting are respectively provided with a flame-retardant waterproof mixture filling port, and a port cover is arranged at the port of the flame-retardant waterproof mixture filling port.
2. The explosion-proof device for the intermediate joint of a high-voltage cable as claimed in claim 1, wherein the pressure relief cover is detachably disposed at an end of the pressure relief port.
3. The explosion-proof device for the intermediate joint of the high-voltage cable as claimed in claim 1, wherein the insulating waterproof filling layer is one or more of an adhesive tape and a heat-shrinkable tube with insulating and waterproof properties; the flame-retardant waterproof mixture layer is a bi-component polyurethane coating.
4. The explosion-proof device for the intermediate joint of the high-voltage cable according to claim 1, wherein the material of the cable end sealing hardware fitting is one of aluminum magnesium alloy, stainless steel or high-strength PE material; the grounding wire end sealing hardware fitting is made of one of aluminum magnesium alloy, stainless steel or high-strength PE (polyethylene) materials; the pressure relief port is made of one of aluminum magnesium alloy, stainless steel or high-strength PE materials.
5. A method for using an explosion-proof device for a high-voltage cable intermediate joint according to any one of claims 1 to 4, comprising:
sealing the left half box and the right half box, connecting the left half box and the right half box through bolts, and sleeving an explosion-proof shell main body on the outer side of a cable joint; the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting are connected with the cable port and the ground wire port respectively, a flame-retardant waterproof mixture is injected into the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting, and finally, an insulating waterproof filling layer is wound on the end portions of the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110520129.5A CN113241720B (en) | 2021-05-13 | 2021-05-13 | Explosion-proof device for high-voltage cable intermediate joint and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110520129.5A CN113241720B (en) | 2021-05-13 | 2021-05-13 | Explosion-proof device for high-voltage cable intermediate joint and use method thereof |
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| CN113241720A CN113241720A (en) | 2021-08-10 |
| CN113241720B true CN113241720B (en) | 2023-03-24 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467680A (en) * | 2020-12-07 | 2021-03-09 | 国网辽宁省电力有限公司沈阳供电公司 | Novel cable joint explosion-proof box |
| CN213185467U (en) * | 2020-09-25 | 2021-05-11 | 威特龙消防安全集团股份公司 | Intelligent fireproof and explosion-proof device for cable intermediate joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468641A (en) * | 2010-11-18 | 2012-05-23 | 郝丁霞 | Waterproof anti-explosion cable connector |
| CN104967086B (en) * | 2015-07-16 | 2017-03-08 | 国网上海市电力公司 | A kind of Integral high-pressure cable explosion-proof connector box |
| CN105281283B (en) * | 2015-11-11 | 2017-11-10 | 国家电网公司 | A kind of Split high pressure cable connector protects explosion-proof fire-extinguishing box |
| CN109217229B (en) * | 2018-10-19 | 2021-02-09 | 特变电工昭和（山东）电缆附件有限公司 | High-pressure waterproof flame-retardant intermediate joint and manufacturing method thereof |
| CN109245023B (en) * | 2018-10-19 | 2021-02-09 | 特变电工昭和（山东）电缆附件有限公司 | High-voltage waterproof flame-retardant intermediate joint for power system and manufacturing method thereof |
| CN209709656U (en) * | 2019-05-16 | 2019-11-29 | 福建华能电气有限公司 | A kind of cable intermediate joint waterproof anti-explosion box |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213185467U (en) * | 2020-09-25 | 2021-05-11 | 威特龙消防安全集团股份公司 | Intelligent fireproof and explosion-proof device for cable intermediate joint |
| CN112467680A (en) * | 2020-12-07 | 2021-03-09 | 国网辽宁省电力有限公司沈阳供电公司 | Novel cable joint explosion-proof box |
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