CN111293664A - Cable terminal tail pipe and connecting process thereof - Google Patents
Cable terminal tail pipe and connecting process thereof Download PDFInfo
- Publication number
- CN111293664A CN111293664A CN202010054770.XA CN202010054770A CN111293664A CN 111293664 A CN111293664 A CN 111293664A CN 202010054770 A CN202010054770 A CN 202010054770A CN 111293664 A CN111293664 A CN 111293664A
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- cable
- metal sheath
- tail pipe
- pipe
- welding
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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
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
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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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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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
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
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- Cable Accessories (AREA)
Abstract
The invention discloses a cable terminal tail pipe and a connection process thereof, wherein the cable terminal tail pipe comprises a conical pipe and a circular pipe, a cable connection part used for being connected with a metal sheath of a cable is formed at one end with a small caliber of the conical pipe, the cable connection part is cylindrical, a spiral groove matched with the outer peripheral surface of the metal sheath of the cable is formed in the inner wall of the cable connection part, when the cable terminal tail pipe is used, the cable connection part is in threaded connection with the metal sheath of the cable, and one end of the cable connection part, far away from the conical pipe, is fixed with the metal sheath of the cable through cold welding. The tail pipe effectively solves the problems that the tail pipe of the cable terminal and the connecting method thereof in the prior art are easy to have the phenomena of lead removal, fracture, oxidation and the like, and cause water inflow, discharge, heating and the like, and the problem that the external shielding of the cable or even the main insulation of the cable is burnt to a certain degree due to the high temperature of the lead-lined process in the prior art, and has very high practical value.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a cable terminal tail pipe and a connection process thereof, which are used for a 110kV crosslinked polyethylene insulated power cable (240 mm)2-1600mm2) And (5) installing an outdoor porcelain bushing and a composite bushing terminal.
Background
The installation of cable accessories is one of the core processes of power cable lines, and the tail pipe assembly method in the installation process of the high-voltage cable accessories at present comprises the following steps: and (3) circumferentially coating lead on the transition part of the tail pipe tail end and the cable metal sheath for connection. Due to the difference of lead-lined levels of installation personnel and the influence of environmental factors, the attaching degree of the tail pipe and the corrugated aluminum sheath of the cable and the firmness of lead sealing can be differentiated, so that a plurality of defects can be generated in the installation process of the accessory. Meanwhile, due to the fact that the temperature is too high in the lead lining process, if the temperature reduction measure is not in place, the outer semi-conducting layer of the cable can be damaged, and even the main insulation can be damaged. In the running process of the cable, the traditional tail pipe and the process are adopted, so that phenomena such as deleading, breaking, oxidation and the like are easy to occur, reactions such as water inflow, discharge, heating and the like are caused, and further, the cable and even a power grid are damaged and lost. Chinese patent document No. CN201038700Y, published as 2008, 3 and 19, discloses a connecting device for a tail tube of a cable terminal and an aluminum sheath of the cable. The tail pipe is connected with the cable aluminum sheath through a copper woven belt wound with metal wires, and the copper woven belt wound with the metal wires is arranged inside the tail pipe. The advantage of this technical scheme is simple structure, connects convenient operation, no longer need twine wire and copper braid over braid, as long as compress tightly the copper braid over braid with the clamping ring and carry out the rigid coupling with bolt etc. can, it is very convenient. Although the scheme avoids the problems caused by lead lining, the tail pipe and the cable aluminum sheath are connected only through the copper woven belt wound with the metal wire, so the electric conductivity and the waterproof performance of the tail pipe cannot be ensured.
Disclosure of Invention
The invention aims to solve the problems that the phenomena of deleading, fracture, oxidation and the like are easy to occur in the tail pipe of the cable terminal and the connection method thereof in the prior art, water inflow, discharge, heating and the like are caused, and the problem that the external shielding of the cable and even the main insulation of the cable are burnt to a certain degree due to the high temperature of the lead-lined process in the prior art, and provides the tail pipe of the cable terminal and the connection method thereof, which can effectively solve the problems.
The invention adopts a specific technical scheme that when the cable terminal tail pipe is used, the cable connecting part is in threaded connection with a metal sheath of a cable, and one end of the cable connecting part, which is far away from the conical pipe, is welded and fixed with the metal sheath of the cable through cold welding. The tail pipe of the cable terminal is fixed with the metal sheath of the cable in a threaded connection mode, and meanwhile, the cold welding technology is adopted to replace the traditional lead-lined process, open fire is not needed to be used during installation, high temperature is not generated, and potential safety hazards such as cable damage and the like are avoided; secondly, the cold welding flux has extremely high hardness, adhesion and strength, almost has no shrinkage rate, can reliably prevent a plurality of chemical actions, physical stress, mechanical stress and the like, and in addition, the stress of the welding connection point can be uniformly distributed, so that the waterproof sealing performance of the terminal is improved, and the service life is prolonged; meanwhile, the accessory installation process is safer and simpler, the one-time success rate of the cable accessory installation can reach 100 percent, and the labor force and the operation time are saved by more than half; meanwhile, due to the safe and reliable operation, the electric quantity loss caused by power failure due to cable fault rush repair is greatly reduced. The tail pipe of the cable terminal and the connection process thereof have enough safety margin and completely meet the conditions and requirements of safe operation of the cable terminal. Therefore, the tail pipe and the connection method thereof solve the problems that the tail pipe of the cable terminal in the prior art is easy to have the phenomena of lead removal, fracture, oxidation and the like, and causes water inflow, discharge, heating and the like, and the problem that the external shield of the cable and even the main insulation of the cable are burnt to a certain extent due to the high temperature of the lead-lined process in the prior art, thereby ensuring the safe operation of the cable terminal.
Preferably, the tube body part is of a copper-clad aluminum double-layer structure, the inner layer of the tube body part is made of aluminum materials, the outer layer of the tube body part is made of copper materials, and the metal sheath of the cable is an aluminum sheath. The inner layer is made of aluminum materials, and is made of the same materials as the cable aluminum sheath, so that reliable connection between the inner layer and the cable aluminum sheath is facilitated.
Preferably, the cable connecting part is provided with a stepped shaft-shaped welding section at one end far away from the conical pipe, the welding section is of a single-layer aluminum material structure, the outer diameter of the welding section is smaller than that of one end, close to the conical pipe, of the cable connecting part, and the cable terminal tail pipe is fixed with the metal sheath of the cable through cold welding of the welding section. The length of the welding section is 20 to 30 percent of the total length of the cable connecting part (including the length of the welding section), and the wall thickness of the welding section is 35 to 50 percent of the maximum wall thickness of the cable connecting part. The wall thickness of the welding section is small, so that the cold welding machine can weld conveniently.
Preferably, the fixed part is a flange, fixing holes are uniformly distributed on the flange along the circumferential direction, and a transition arc is arranged between the flange and the circular tube.
Preferably, when the cable connecting part is in threaded connection with the metal sheath of the cable, a conductive layer is arranged between the spiral groove and the metal sheath of the cable, and the conductive layer is conductive paste. The conductive paste is arranged between the spiral groove and the metal sheath of the cable, so that the conductive performance between the tail pipe of the cable terminal and the metal sheath of the cable can be ensured. The conductive paste can play a good role in reducing contact resistance, resisting oxidation, resisting corrosion, prolonging service life and saving active power.
Preferably, the cross section of each spiral groove is arc-shaped, adjacent spiral grooves are in transitional connection through arc-shaped edges, when the cable terminal tail pipe is used, the spiral grooves are in clearance fit with a metal sheath of a cable, and a waterproof sealing adhesive tape is wrapped between the cable terminal tail pipe and the cable. The waterproof sealing adhesive tape can play a role in protecting a welding part and ensure the water drainage sealing at the joint of the tail pipe of the cable terminal and the metal sheath of the cable.
The connecting process of the tail tube of the cable terminal and the cable comprises the following steps:
a. the outer surface of the metal sheath of the cable is treated by a steel wire brush and is uniformly coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
b. the surface of a spiral groove on the inner wall of the cable connecting part is treated by a steel wire brush and coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
c. screwing the cable connecting part of the tail pipe of the cable terminal to the corresponding part of the metal sheath of the cable (namely the part which is evenly smeared with the conductive paste) so as to lead the part to be evenly attached along the circumferential direction of the surface of the metal sheath of the cable;
d. spot welding or overlaying the welding section of the cable connecting part and the metal sheath of the cable by using a cold welding machine until the welding is firm;
e. and (4) coating waterproof sealant on the welding part and nearby and coating a waterproof sealing adhesive tape.
The waterproof sealant coated on the welding part can block fine air holes at the welding part, and the waterproof sealing performance of the waterproof sealing adhesive tape can be ensured after the waterproof sealing adhesive tape is coated.
The invention has the beneficial effects that: the tail pipe effectively solves the problems that the tail pipe of the cable terminal and the connection method thereof in the prior art are easy to have the phenomena of lead removal, fracture, oxidation and the like, and cause water inflow, discharge, heating and the like, and the problems that the external shielding of the cable and even the main insulation of the cable are burnt to a certain degree due to the high temperature of the lead-lined process in the prior art, so that the installation process of accessories is safer and simpler, the once success rate of the installation of the cable accessories is up to 100 percent, and the labor force and the operation time are saved by; meanwhile, the electric quantity loss caused by power failure due to cable fault rush repair is greatly reduced, and the method has high practical value.
Drawings
FIG. 1 is a schematic view of a cable termination liner of the present invention in connection with a cable;
FIG. 2 is a schematic view of one configuration of the cable termination tailpipe of the present invention;
fig. 3 is a left side view of fig. 2.
In the figure: 1. the cable comprises a conical tube, 2 circular tubes, 3 cable connecting parts, 4 spiral grooves, 5 welding sections, 6 flange plates, 7 fixing holes, 8 waterproof sealing adhesive tapes, 9 cables and 10 metal sheaths.
Detailed Description
The following is a further description of embodiments of the present invention by way of examples and with reference to the accompanying drawings.
Example 1
In embodiment 1 shown in fig. 1, a tail tube for a cable terminal includes a tube body portion and a fixed portion, the tube body portion is a copper-clad aluminum double-layer structure, an inner layer of the tube body portion is made of aluminum material, an outer layer of the tube body portion is made of copper material, the tube body portion includes a conical tube 1 and a circular tube 2, one end of the circular tube is connected with a large-caliber end of the conical tube, the other end of the circular tube is connected with the fixed portion, a cable connecting portion 3 used for being connected with an aluminum sheath of a cable is formed at a small-caliber end of the conical tube, the cable connecting portion is cylindrical, a spiral groove 4 matched with the outer peripheral surface of the aluminum sheath of the cable is formed in the inner wall of the cable connecting portion; the fixed part be ring flange 6, along circumference evenly distributed on the ring flange 12 fixed orificess 7 (see figure 3), ring flange and pipe between be equipped with the transition circular arc.
The cable connecting part is formed with a stepped shaft-shaped welding section 5 (see figure 2) at one end far away from the conical pipe, the welding section is of a single-layer aluminum material structure, the outer diameter of the welding section is smaller than that of one end, close to the conical pipe, of the cable connecting part, and the cable terminal tail pipe is fixed with a metal sheath of a cable through cold welding of the welding section. The length of the welded section of the present embodiment is 25% of the total length of the cable connection (including the length of the welded section), and the wall thickness of the welded section is 40% of the maximum wall thickness of the cable connection.
When the tail pipe of the cable terminal is used, the cable connecting part is in threaded connection with the aluminum sheath of the cable, the spiral groove is in clearance fit with the aluminum sheath of the cable, the maximum clearance is less than 0.4 mm, a conductive layer is arranged between the spiral groove and the aluminum sheath of the cable, the conductive layer is conductive paste, and one end of the cable connecting part, far away from the conical pipe, is welded and fixed with the aluminum sheath of the cable through cold welding; and a waterproof sealing adhesive tape 8 is coated between the tail pipe of the cable terminal and the cable.
The connecting process between the tail pipe of the cable terminal and the aluminum sheath of the cable comprises the following steps:
a. the outer surface of the metal sheath of the cable is treated by a steel wire brush and is uniformly coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
b. the surface of a spiral groove on the inner wall of the cable connecting part is treated by a steel wire brush and coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
c. screwing the cable connecting part of the tail pipe of the cable terminal to the corresponding part of the metal sheath of the cable (namely the part which is evenly smeared with the conductive paste) so as to lead the part to be evenly attached along the circumferential direction of the surface of the metal sheath of the cable;
d. spot welding or overlaying the welding section of the cable connecting part and the metal sheath of the cable by using a cold welding machine until the welding is firm;
e. and (4) coating waterproof sealant on the welding part and nearby and coating a waterproof sealing adhesive tape.
The tail pipe of the cable terminal is fixed with the metal sheath of the cable in a screw connection modeMeanwhile, the cold welding technology is adopted to replace the traditional lead-lined process, open fire is not needed during installation, high temperature is not generated, and potential safety hazards such as cable damage and the like are avoided; secondly, the cold welding flux has extremely high hardness, adhesion and strength, almost has no shrinkage rate, can reliably prevent a plurality of chemical actions, physical stress, mechanical stress and the like, and in addition, the stress of the welding connection point can be uniformly distributed, so that the waterproof sealing performance of the terminal is improved, and the service life is prolonged; meanwhile, the accessory installation process is safer and simpler, the one-time success rate of the cable accessory installation can reach 100 percent, and the labor force and the operation time are saved by more than half; meanwhile, due to the safe and reliable operation, the electric quantity loss caused by power failure due to cable fault rush repair is greatly reduced. The tail pipe of the cable terminal and the connection process thereof have enough safety margin, completely meet the conditions and requirements of safe operation of the cable terminal, and are suitable for 110kV crosslinked polyethylene insulated power cables (240 mm)2-1600mm2) And (5) installing an outdoor porcelain bushing and a composite bushing terminal.
In addition to the above-mentioned embodiments, the technical features or technical data of the present invention may be reselected and combined to form new embodiments within the scope disclosed in the claims and the specification of the present invention, and the embodiments of the present invention not described in detail can be easily implemented by those skilled in the art without creative efforts, so the embodiments not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.
Claims (8)
1. The utility model provides a cable termination tail pipe, includes body part and fixed part, its characterized in that, the body part include toper pipe (1) and pipe (2), pipe one end be connected with toper pipe heavy-calibre end, the other end and the fixed part of pipe are connected, the small-bore one end of toper pipe is formed with cable junction portion (3) that are used for being connected with metal sheath (10) of cable (9), cable junction portion be cylindricly, its inner wall be equipped with spiral groove (4) with the metal sheath peripheral face looks adaptation of cable, cable termination tail pipe when using, the metal sheath spiro union of cable junction portion and cable, the one end that the toper pipe was kept away from to cable junction portion is fixed through cold welding between the metal sheath of cable.
2. The tail tube of claim 1, wherein the tube body is a copper clad aluminum double layer structure, the inner layer is made of aluminum material, the outer layer is made of copper material, and the metal sheath of the cable is an aluminum sheath.
3. The cable termination tail pipe according to claim 2, wherein the cable connection portion is formed with a stepped shaft-like welding section (5) at an end away from the tapered tube, the welding section is of a single-layer aluminum material structure, an outer diameter of the welding section is smaller than an outer diameter of an end of the cable connection portion close to the tapered tube, and the cable termination tail pipe is cold-welded and fixed to the metal sheath of the cable by the welding section.
4. A cable termination liner according to claim 3, wherein the length of the solder segment is 20% to 30% of the total length of the cable connector, and the wall thickness of the solder segment is 35% to 50% of the maximum wall thickness of the cable connector.
5. The tail tube of claim 1, wherein the fixing portion is a flange (6) having fixing holes (7) uniformly distributed along the circumferential direction, and a transition arc is provided between the flange and the circular tube.
6. The tail pipe according to claim 1, wherein when the cable connecting portion is screwed to the metal sheath of the cable, a conductive layer is provided between the spiral groove and the metal sheath of the cable, and the conductive layer is a conductive paste.
7. The cable terminal tail pipe according to claims 1-6, wherein the cross section of the spiral groove is arc-shaped, adjacent spiral grooves are in transition connection through arc-shaped edges, when the cable terminal tail pipe is used, the spiral groove is in clearance fit with a metal sheath of a cable, and a waterproof sealing tape (8) is coated between the cable terminal tail pipe and the cable.
8. A process for joining tail tubes of cable terminations according to claim 1, comprising the steps of:
a. the outer surface of the metal sheath of the cable is treated by a steel wire brush and is uniformly coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
b. the surface of a spiral groove on the inner wall of the cable connecting part is treated by a steel wire brush and coated with conductive paste, so that the lubricating degree and the conductive performance are improved;
c. screwing the cable connecting part of the tail pipe of the cable terminal to the corresponding part of the metal sheath of the cable, so that the part is uniformly attached along the circumferential direction of the surface of the metal sheath of the cable;
d. spot welding or overlaying the welding section of the cable connecting part and the metal sheath of the cable by using a cold welding machine until the welding is firm;
e. and (4) coating waterproof sealant on the welding part and nearby and coating a waterproof sealing adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054770.XA CN111293664B (en) | 2020-01-17 | 2020-01-17 | Cable terminal tail pipe and connecting process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054770.XA CN111293664B (en) | 2020-01-17 | 2020-01-17 | Cable terminal tail pipe and connecting process thereof |
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| CN111293664A true CN111293664A (en) | 2020-06-16 |
| CN111293664B CN111293664B (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010054770.XA Active CN111293664B (en) | 2020-01-17 | 2020-01-17 | Cable terminal tail pipe and connecting process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112188654A (en) * | 2020-10-14 | 2021-01-05 | 安邦电气股份有限公司 | Anti-freezing self-temperature-limiting electric tracing band for water supply pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4385663A (en) * | 1981-08-03 | 1983-05-31 | Chevron Research Company | Packerless well completion assembly |
| CN103219691A (en) * | 2013-04-23 | 2013-07-24 | 常州市拓源电缆成套有限公司 | Novel dry-type cable terminal |
| CN203251056U (en) * | 2013-04-23 | 2013-10-23 | 常州市拓源电缆成套有限公司 | Porcelain sleeve-type cable terminal head |
| CN204190342U (en) * | 2014-09-25 | 2015-03-04 | 江苏远航电缆附件有限公司 | Novel 110kV and above composite sheath terminal tail pipe |
| CN206712441U (en) * | 2017-05-23 | 2017-12-05 | 北京国电四维电力技术有限公司 | A kind of oil-filled outdoor cable terminals of 110kV |
| CN110190576A (en) * | 2019-06-14 | 2019-08-30 | 深圳供电局有限公司 | Tail pipe sealing device of cable terminal |
-
2020
- 2020-01-17 CN CN202010054770.XA patent/CN111293664B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4385663A (en) * | 1981-08-03 | 1983-05-31 | Chevron Research Company | Packerless well completion assembly |
| CN103219691A (en) * | 2013-04-23 | 2013-07-24 | 常州市拓源电缆成套有限公司 | Novel dry-type cable terminal |
| CN203251056U (en) * | 2013-04-23 | 2013-10-23 | 常州市拓源电缆成套有限公司 | Porcelain sleeve-type cable terminal head |
| CN204190342U (en) * | 2014-09-25 | 2015-03-04 | 江苏远航电缆附件有限公司 | Novel 110kV and above composite sheath terminal tail pipe |
| CN206712441U (en) * | 2017-05-23 | 2017-12-05 | 北京国电四维电力技术有限公司 | A kind of oil-filled outdoor cable terminals of 110kV |
| CN110190576A (en) * | 2019-06-14 | 2019-08-30 | 深圳供电局有限公司 | Tail pipe sealing device of cable terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112188654A (en) * | 2020-10-14 | 2021-01-05 | 安邦电气股份有限公司 | Anti-freezing self-temperature-limiting electric tracing band for water supply pipe |
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| CN111293664B (en) | 2021-05-14 |
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