CN113241719A - Waterproof and explosion-proof high-voltage cable intermediate joint and use method thereof - Google Patents
Waterproof and explosion-proof high-voltage cable intermediate joint and use method thereof Download PDFInfo
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- CN113241719A CN113241719A CN202110520059.3A CN202110520059A CN113241719A CN 113241719 A CN113241719 A CN 113241719A CN 202110520059 A CN202110520059 A CN 202110520059A CN 113241719 A CN113241719 A CN 113241719A
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cable Accessories (AREA)
Abstract
The invention relates to a waterproof and explosion-proof high-voltage cable intermediate joint and a using method thereof. The cable joint comprises a conductor connecting pipe, an internal shielding metal sleeve, a temperature sensor, a rubber body, a first insulating waterproof filling layer, a partial discharge sensor, a first flame-retardant waterproof mixture layer, a copper shell, a second insulating waterproof filling layer and an explosion-proof shell which are sequentially arranged from inside to outside. The invention has the functions of real-time temperature measurement and partial discharge measurement, can detect the running condition of the product real-time, and can acquire information for the abnormal condition at the first time, thereby quickly coping with the abnormal condition, and simultaneously has the functions of water resistance and explosion prevention, and can solve the problem that the explosion occurs due to sudden faults to damage the surrounding cable lines, electric power facilities and personnel, thereby ensuring the normal running of the product in all aspects.
Description
Technical Field
The invention relates to a waterproof and explosion-proof 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 connectors is continuously increased, the high-voltage cable connectors are influenced by human factors, construction, operation environments and other factors, 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 operating at the periphery, even cause more serious secondary accidents, and the loss caused by the 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;
chinese patent publication No. CN209150699U discloses a high-pressure 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 a waterproof and explosion-proof high-voltage cable intermediate joint.
The invention also provides a use method of the waterproof and explosion-proof high-voltage cable intermediate joint.
The invention adopts the following technical scheme:
a waterproof and explosion-proof high-voltage cable intermediate joint comprises a conductor connecting pipe, an internal shielding metal sleeve, a temperature sensor, a rubber body, a first insulating and waterproof filling layer, a partial discharge sensor, a first flame-retardant and waterproof mixture layer, a copper shell, a second insulating and waterproof filling layer and an explosion-proof shell which are sequentially arranged from inside to outside;
the two ends of the conductor connecting pipe are connected with the conductors of the two sections of cables; the conductor connecting pipe is sleeved with the shielding metal sleeve; the temperature sensor is arranged on the outer wall of the internal shielding metal sleeve; the first insulating waterproof filling layer is arranged on the outer side and the end part of the rubber body; the first flame-retardant waterproof mixture layer is filled between the copper shell and the first insulating waterproof filling layer, and the second insulating waterproof filling layer is distributed on the outer wall of the copper shell; the explosion-proof shell is sleeved outside the second insulating waterproof filling layer;
the explosion-proof shell is provided with a pressure relief port, and a pressure relief cover is arranged at the end part of the pressure relief port; the end part of the explosion-proof shell is provided with a cable end part sealing hardware fitting and a grounding wire end part sealing hardware fitting, and a second flame-retardant waterproof mixture layer is filled between the cable end part sealing hardware fitting and the cable; and a second flame-retardant waterproof mixture layer is poured between the grounding wire end sealing hardware fitting and the grounding wire, and a third insulating waterproof filling layer is arranged at the end parts of the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting.
The temperature sensor is used for detecting the temperature condition of the conductor in real time; the partial discharge sensor is used for detecting the partial discharge condition of a product in real time.
And no filler is arranged between the explosion-proof shell and the second insulating waterproof filling layer, and when explosion occurs, high pressure quickly passes through the cavity and is released through the pressure relief opening.
Preferably, the thickness of the pressure relief cover is 0.3-0.8 mm, and the thickness of the explosion-proof shell is 10-20 mm; the diameter of the explosion-proof shell is 350 mm-450 mm; the diameter of the pressure relief opening is 50-60 mm, and the number of the pressure relief openings is 4. Experiments prove that the explosion-proof shell of the group of data can resist the highest pressure and the highest explosion impact and exceed the requirements of related national standards.
Preferably, 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 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 can be recycled after the explosion-proof pressure relief cover is replaced, the use cost is reduced, the overhaul efficiency is improved, and the cost resource is saved.
Preferably, the temperature sensor surrounds the outer wall of the inner shielding metal sleeve for a circle; the partial discharge sensor surrounds the first insulating waterproof filling layer for a circle. The encircling arrangement improves the accuracy of the measurement.
Preferably, the middle of the conductor connecting pipe is of a solid structure, and two ends of the conductor connecting pipe are of tubular structures; the conductor connecting pipe is connected with the conductors of the two sections of cables through compression joint. The tubular structures at the two ends are responsible for being connected with the cable, and the solid structure in the middle provides a conductive section corresponding to the section of the cable, so that the current in the cable can smoothly pass through the joint without damage;
the conductor of cable is inserted to the both sides of conductor connecting pipe, has guaranteed the compactness of conductor and conductor connecting pipe contact through the mode of crimping, compares with the welding, and the contact resistance of crimping is little, avoids appearing the phenomenon of generating heat in the use, simultaneously to the cable not damaged.
Preferably, the ports at the two ends of the copper shell are contraction ports, and the contraction ports are sealed by waterproof cement and a second insulating waterproof filling layer.
Preferably, the conductor connecting pipe is made of copper, copper alloy, aluminum or aluminum alloy; the inner shielding metal sleeve is made of copper, copper alloy, aluminum or aluminum alloy; the rubber body is made of ethylene propylene diene monomer or silicone rubber. The inner shielding metal sleeve can reduce the contact resistance of conductor connection and homogenize the field intensity distribution at the conductor connection. The rubber body 4 functions as a uniform electric field.
Preferably, the first insulating waterproof filling layer, the second insulating waterproof filling layer and the third insulating waterproof filling layer are one or more of an adhesive tape and a heat-shrinkable tube with insulating and waterproof properties. The insulating waterproof filling layer plays a role in insulation and water resistance.
Preferably, the first flame-retardant waterproof mixture layer and the second flame-retardant waterproof mixture layer are both double-component polyurethane coatings. 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.
Preferably, the copper shell is made of one of bronze, red copper or brass; the material of the explosion-proof shell is one of aluminum magnesium alloy, stainless steel or high-strength PE material. The explosion-proof shell plays a waterproof and explosion-proof role.
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 port is made of one of aluminum magnesium alloy, stainless steel or high-strength PE materials.
The application method of the waterproof and explosion-proof high-voltage cable intermediate joint comprises the following steps:
the method comprises the following steps of firstly, processing the end parts of cables on two sides to expose cable conductors with specified sizes, then inserting the cable conductors on the two sides into a conductor connecting pipe for press connection, sleeving an inner shielding metal sleeve outside the conductor connecting pipe, arranging a temperature sensor outside the inner shielding metal sleeve, sleeving a rubber body outside the inner shielding metal sleeve and the temperature sensor, winding a first insulating waterproof filling layer on the outer side and the end parts of the rubber body, and arranging a partial discharge sensor outside one end of the first insulating waterproof filling layer; after the copper shell is sleeved on the outer side of the first insulating waterproof filling layer, a first flame-retardant waterproof mixture layer is poured between a cavity defined by the first insulating waterproof filling layer and the copper shell, a second insulating waterproof filling layer is wound on the outer side and the end part of the copper shell, and an explosion-proof shell is sleeved on the outer side of the second insulating waterproof filling layer; the end part of the explosion-proof shell is connected with the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting, a second flame-retardant waterproof mixture is injected into the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting, and a third insulating waterproof filling layer is wound on 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 waterproof and explosion-proof high-voltage cable intermediate joint has the functions of constantly measuring temperature and measuring partial discharge, and simultaneously has the waterproof and explosion-proof functions, so that the occurrence of joint explosion accidents is reduced, and the potential safety hazard of the cable intermediate joint in the use process is avoided; the invention has low manufacturing cost and simple construction process and is suitable for large-scale popularization.
Drawings
Fig. 1 is a schematic structural diagram of a middle joint of a waterproof and explosion-proof high-voltage cable according to the invention;
FIG. 2 is an enlarged view of a portion of the middle portion of FIG. 1;
wherein: 1. conductor connecting pipe, 2, inside shield metal sleeve, 3, temperature sensor, 4, rubber body, 5, first insulating waterproof filling layer, 6, the sensor is put in the office, 7, first fire-retardant waterproof mixture, 8, the copper shell, 9, the second insulating waterproof filling layer, 10, explosion-proof shell, 11, pressure release mouth, 12, the sealed gold utensil of cable tip, 13, the sealed gold utensil of earth connection terminal portion, 14, the fire-retardant waterproof mixture of second, 15, the third insulating waterproof filling layer.
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 and 2.
A waterproof and explosion-proof high-voltage cable intermediate joint comprises a conductor connecting pipe 1, an internal shielding metal sleeve 2, a temperature sensor 3, a rubber body 4, a first insulating and waterproof filling layer 5, a partial discharge sensor 6, a first flame-retardant and waterproof mixture layer 7, a copper shell 8, a second insulating and waterproof filling layer 9 and an explosion-proof shell 10 which are sequentially arranged from inside to outside;
two ends of the conductor connecting pipe 1 are connected with the conductors of the two sections of cables; the conductor connecting pipe 1 is sleeved with the shielding metal sleeve 2; the temperature sensor 3 is arranged on the outer wall of the internal shielding metal sleeve 2; the first insulating waterproof filling layer 5 is arranged on the outer side and the end part of the rubber body 4; the first flame-retardant waterproof mixture layer 7 is filled between the copper shell 8 and the first insulating waterproof filling layer 5, and the second insulating waterproof filling layer 9 is distributed on the outer wall of the copper shell 8; the explosion-proof shell 10 is sleeved outside the second insulating waterproof filling layer 9;
the explosion-proof shell 10 is provided with a pressure relief port 11, and a pressure relief cover is arranged at the end part of the pressure relief port; the end part of the explosion-proof shell 10 is provided with a cable end part sealing hardware 12 and a grounding wire end part sealing hardware 13, and a second flame-retardant waterproof mixture layer 14 is filled between the cable end part sealing hardware 12 and the cable; a second flame-retardant waterproof mixture layer 14 is filled between the grounding wire end sealing hardware fitting 13 and the grounding wire, and a third insulating waterproof filling layer 15 is arranged at the end parts of the cable end sealing hardware fitting 12 and the grounding wire end sealing hardware fitting 13.
The temperature sensor 3 is used for detecting the temperature condition of the conductor in real time; the partial discharge sensor 6 is used for detecting the partial discharge condition of the product in real time.
And no filler is filled between the explosion-proof shell 10 and the second insulating waterproof filling layer 9, and when explosion occurs, high pressure quickly passes through the cavity and is released through the pressure relief port 11.
Comparative example 1:
a common cable intermediate joint is free of a temperature sensor, a partial discharge sensor, a pressure relief opening, a cable end sealing hardware fitting, a grounding wire end sealing hardware fitting, a second layer of flame-retardant waterproof mixture and a third layer of insulating waterproof filling layer; the non-flame-retardant polyester polyurethane coating is filled in a cavity between the first insulating waterproof filling layer and the copper shell and a cavity between the second insulating waterproof filling layer and the explosion-proof shell, and other structures are the same as those in the embodiment 1.
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, embodiment 1 of the present invention has functions of real-time temperature measurement and partial discharge measurement, and can detect the operation condition of the product real-time, and obtain information for the abnormal condition at the first time, thereby rapidly coping with the abnormal condition, and simultaneously has the water-proof and explosion-proof functions, and can solve the problem of damage to surrounding cable lines, electric power facilities and personnel due to explosion caused by an emergency fault, thereby ensuring normal operation of the product in all aspects.
Example 2
In the waterproof and explosion-proof high-voltage cable intermediate joint in embodiment 1, further, the thickness of the pressure relief cover is 0.5mm, and the thickness of the explosion-proof shell is 15 mm; the diameter of the explosion-proof shell is 400 mm; the diameter of the pressure relief openings is 60mm, and the number of the pressure relief openings is 4; the four pressure relief ports are divided into two pairs and are symmetrically arranged at two ends of the explosion-proof shell. Experiments prove that the explosion-proof shell of the group of data can resist the highest pressure and the highest explosion impact and exceed the requirements of related national standards.
Example 3
In the waterproof and explosion-proof high-voltage cable intermediate joint according to embodiment 1, further, the cable end sealing hardware 12 and the grounding wire end sealing hardware 13 are respectively provided with a flame-retardant and waterproof mixture filling port, and a port cover is arranged at a port of the flame-retardant and waterproof mixture filling port.
Example 4
As embodiment 1, the waterproof and explosion-proof high-voltage cable intermediate joint, further, the pressure relief cover is detachably disposed at the end of the pressure relief opening 11. After explosion occurs, the explosion-proof shell 10 can be reused after the explosion-proof pressure relief cover is replaced, so that the use cost is reduced, the overhaul efficiency is improved, and the cost resource is saved.
Example 5
As in embodiment 1, the intermediate joint of the waterproof and explosion-proof high-voltage cable, further, the temperature sensor 3 surrounds the outer wall of the inner shielding metal sleeve 2 for a circle; the partial discharge sensor 6 surrounds the first insulating waterproof filling layer 5 for a circle. The encircling arrangement improves the accuracy of the measurement.
Example 6
As in the waterproof and explosion-proof high-voltage cable middle joint of embodiment 1, further, the middle of the conductor connecting pipe 1 is of a solid structure, and two ends of the conductor connecting pipe are of tubular structures; the conductor connecting pipe 1 connects the conductors of the two sections of cables by crimping. The tubular structures at the two ends are responsible for being connected with the cable, and the solid structure in the middle provides a conductive section corresponding to the section of the cable, so that the current in the cable can smoothly pass through the joint without damage;
the conductor of cable is inserted to the both sides of conductor connecting pipe 1, has guaranteed the compactness of conductor and 1 conductor connecting pipe contact through the mode of crimping, compares with the welding, and the contact resistance of crimping is little, avoids appearing the phenomenon of generating heat in the use, simultaneously to the cable not damaged.
Example 7
In the waterproof and explosion-proof high-voltage cable intermediate joint according to embodiment 1, further, the ports at the two ends of the copper shell 8 are contraction ports, and the contraction ports are sealed by waterproof cement and the second insulating and waterproof filling layer 9.
Example 8
In the embodiment 1, the intermediate joint of the waterproof and explosion-proof high-voltage cable is further characterized in that the conductor connecting pipe 1 and the inner shielding metal sleeve 2 are made of aluminum alloy; the rubber body 4 is ethylene propylene diene monomer. The inner shielding metal sleeve 2 can reduce the contact resistance of the conductor connection and homogenize the field intensity distribution at the conductor connection. The rubber body 4 functions as a uniform electric field.
The first insulating waterproof filling layer 5, the second insulating waterproof filling layer 9 and the third insulating waterproof filling layer 15 are all adhesive tapes with insulating and waterproof properties. The insulating waterproof filling layer plays a role in insulation and water resistance.
The first flame-retardant waterproof mixture layer 7 and the second flame-retardant waterproof mixture layer 14 are both bi-component polyurethane coatings. 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 copper shell 8 is made of bronze; the explosion-proof shell 10 is made of aluminum magnesium alloy. The explosion-proof shell 10 plays a role in water resistance and explosion resistance.
The cable end sealing hardware 12, the grounding wire end sealing hardware 13 and the pressure relief port 11 are made of aluminum magnesium alloy.
Example 9
A method for using the middle joint of the waterproof and explosion-proof high-voltage cable according to any one of embodiments 1 to 8, comprising the following steps:
firstly, processing the end parts of cables on two sides to expose cable conductors with specified sizes, then inserting the cable conductors on two sides into a conductor connecting pipe 1 for press connection, sleeving an inner shielding metal sleeve 2 on the outer side of the conductor connecting pipe 1, arranging a temperature sensor 3 on the outer side of the inner shielding metal sleeve 2, sleeving 4 rubber bodies on the outer sides of the inner shielding metal sleeve 2 and the temperature sensor 3, winding a first insulating waterproof filling layer 5 on the outer side and the end part of each rubber body 4, and arranging a partial discharge sensor 6 on the outer side of one end of the first insulating waterproof filling layer 5; after the copper shell 8 is sleeved outside the first insulating waterproof filling layer 5, a first flame-retardant waterproof mixture layer 7 is poured between a cavity defined by the first insulating waterproof filling layer 5 and the copper shell 8, a second insulating waterproof filling layer 9 is wound on the outer side and the end part of the copper shell 8, and an explosion-proof shell 10 is sleeved outside the second insulating waterproof filling layer 9; the end part of the explosion-proof shell 10 is connected with a cable end part sealing hardware 12 and a grounding wire end part sealing hardware 13, a second flame-retardant waterproof mixture 14 is injected into the cable end part sealing hardware 12 and the grounding wire end part sealing hardware 13, and the end parts of the cable end part sealing hardware 12 and the grounding wire end part sealing hardware 13 are wound with a third insulating waterproof filling layer 15.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A waterproof and explosion-proof high-voltage cable intermediate joint is characterized by comprising a conductor connecting pipe, an internal shielding metal sleeve, a temperature sensor, a rubber body, a first insulating and waterproof filling layer, a partial discharge sensor, a first flame-retardant and waterproof mixture layer, a copper shell, a second insulating and waterproof filling layer and an explosion-proof shell which are sequentially arranged from inside to outside; the two ends of the conductor connecting pipe are connected with the conductors of the two sections of cables; the conductor connecting pipe is sleeved with the shielding metal sleeve; the temperature sensor is arranged on the outer wall of the internal shielding metal sleeve; the first insulating waterproof filling layer is arranged on the outer side and the end part of the rubber body; the first flame-retardant waterproof mixture layer is filled between the copper shell and the first insulating waterproof filling layer, and the second insulating waterproof filling layer is distributed on the outer wall of the copper shell; the explosion-proof shell is sleeved outside the second insulating waterproof filling layer; the explosion-proof shell is provided with a pressure relief port, and a pressure relief cover is arranged at the end part of the pressure relief port; the end part of the explosion-proof shell is provided with a cable end part sealing hardware fitting and a grounding wire end part sealing hardware fitting, and a second flame-retardant waterproof mixture layer is filled between the cable end part sealing hardware fitting and the cable; and a second flame-retardant waterproof mixture layer is poured between the grounding wire end sealing hardware fitting and the grounding wire, and a third insulating waterproof filling layer is arranged at the end parts of the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting.
2. The waterproof and explosion-proof high-voltage cable intermediate joint as claimed in claim 1, wherein the thickness of the pressure relief cover is 0.3-0.8 mm, and the thickness of the explosion-proof shell is 10-20 mm; the diameter of the explosion-proof shell is 350 mm-450 mm; the diameter of the pressure relief opening is 50-60 mm, and the number of the pressure relief openings is 4.
3. The intermediate joint of a waterproof and explosion-proof high-voltage cable according to claim 1, wherein the cable end sealing hardware fitting and the grounding wire end sealing hardware fitting are respectively provided with a flame-retardant and waterproof mixture filling port, and a port cover is arranged at a port of the flame-retardant and waterproof mixture filling port.
4. The waterproof and explosion-proof high-voltage cable intermediate joint according to claim 1, wherein the pressure relief cover is detachably arranged at the end of the pressure relief opening.
5. The intermediate joint for waterproof and explosion-proof high-voltage cables as claimed in claim 1, wherein the temperature sensor surrounds the outer wall of the inner shielding metal sleeve for one circle; the partial discharge sensor surrounds the first insulating waterproof filling layer for a circle.
6. The intermediate joint of the waterproof and explosion-proof high-voltage cable as claimed in claim 1, wherein the conductor connecting pipe has a solid structure in the middle and tubular structures at two ends; the conductor connecting pipe is connected with the conductors of the two sections of cables through compression joint.
7. The intermediate joint of a waterproof and explosion-proof high-voltage cable as claimed in claim 1, wherein the ends of the copper shell are shrink openings, and the shrink openings are sealed by waterproof mastic and a second insulating and waterproof filling layer.
8. The intermediate joint of a waterproof and explosion-proof high-voltage cable according to claim 1, wherein the conductor connecting pipe is made of copper, copper alloy, aluminum or aluminum alloy; the inner shielding metal sleeve is made of copper, copper alloy, aluminum or aluminum alloy; the rubber body is made of ethylene propylene diene monomer or silicone rubber; the first insulating waterproof filling layer, the second insulating waterproof filling layer and the third insulating waterproof filling layer are one or more of an adhesive tape and a heat-shrinkable tube with insulating and waterproof properties; the first flame-retardant waterproof mixture layer and the second flame-retardant waterproof mixture layer are both double-component polyurethane coating; the copper shell is made of one of bronze, red copper or brass; the explosion-proof shell is made of one of aluminum magnesium alloy, stainless steel or high-strength PE (polyethylene) materials; 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.
9. A method for using the waterproof and explosion-proof high-voltage cable intermediate joint according to any one of claims 1 to 8, which comprises the following steps:
the method comprises the following steps of firstly, processing the end parts of cables on two sides to expose cable conductors with specified sizes, then inserting the cable conductors on the two sides into a conductor connecting pipe for press connection, sleeving an inner shielding metal sleeve outside the conductor connecting pipe, arranging a temperature sensor outside the inner shielding metal sleeve, sleeving a rubber body outside the inner shielding metal sleeve and the temperature sensor, winding a first insulating waterproof filling layer on the outer side and the end parts of the rubber body, and arranging a partial discharge sensor outside one end of the first insulating waterproof filling layer; after the copper shell is sleeved on the outer side of the first insulating waterproof filling layer, a first flame-retardant waterproof mixture layer is poured between a cavity defined by the first insulating waterproof filling layer and the copper shell, a second insulating waterproof filling layer is wound on the outer side and the end part of the copper shell, and an explosion-proof shell is sleeved on the outer side of the second insulating waterproof filling layer; the end part of the explosion-proof shell is connected with the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting, a second flame-retardant waterproof mixture is injected into the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting, and a third insulating waterproof filling layer is wound on the end parts of the cable end part sealing hardware fitting and the grounding wire end part sealing hardware fitting.
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| CN113241719B (en) | 2023-03-28 |
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