CN109038467B - 0.4kV cable quick transfer box - Google Patents
0.4kV cable quick transfer box Download PDFInfo
- Publication number
- CN109038467B CN109038467B CN201810709721.8A CN201810709721A CN109038467B CN 109038467 B CN109038467 B CN 109038467B CN 201810709721 A CN201810709721 A CN 201810709721A CN 109038467 B CN109038467 B CN 109038467B
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- CN
- China
- Prior art keywords
- cable
- box
- row
- shielding layer
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000012546 transfer Methods 0.000 title claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 23
- 239000010935 stainless steel Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000009422 external insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- 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
- H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
Landscapes
- Cable Accessories (AREA)
Abstract
The invention provides a 0.4kV cable quick transfer box which comprises a transfer box main body, a wire inlet cable plugging device and a wire outlet cable connecting device, wherein the wire inlet cable plugging device comprises four wire inlet cable connecting terminals, each wire inlet cable connecting terminal comprises a wall bushing and a connecting terminal box, one end of the wall bushing is provided with a first copper wire row, the other end of the wall bushing is provided with a second copper wire row, the second copper wire row is connected with the connecting terminal box, two sides of the connecting terminal box are respectively provided with through holes, the second copper wire row is inserted into one side of the through holes, a stainless steel tube is sleeved in the other side of the through holes, a wire nose is arranged in the connecting terminal box, the second copper wire row is fixedly connected with the wire nose through conductive screws, and the wire nose part extends into the stainless steel tube. The invention provides a 0.4kV cable quick-switching box which can quickly establish good electrical connection and quickly restore cable insulation.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a 0.4kV cable quick-switching box.
Background
The district power supply system adopts a American (European) step-down box-type transformer substation, has two voltage levels of 10kV and 0.4kV, is connected with a 10kV bus of a 110kV transformer substation passing by a district at one side, and is mainly used for electricity utilization of district users and district public places at one side of 0.4 kV.
With the requirement of the development of society and in order to meet the running regulations of distribution lines and equipment, the original box transformer is required to be replaced or added with capacity, in the prior art, after the original live line is bypassed and connected with a section of cable line to replace the live line, the original live line is disconnected to be neutral, and after the live line becomes a neutral zone, the box transformer is subjected to power failure maintenance and replacement work. However, in the process of switching the cable, the contact of conductors at the joint is guaranteed, and meanwhile, the external insulation performance is guaranteed after the switching is completed, so that the cable switching takes about 6-8 hours, power is required to be cut off for users in the period of time, and social benefit and economic benefit are lost.
Disclosure of Invention
The invention aims to provide a 0.4kV cable quick-connection box which can quickly establish good electrical connection and quickly restore cable insulation.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a 0.4kV cable quick transfer box, includes transfer box main part, inlet wire cable plug device and outlet wire cable connecting device, inlet wire cable plug device with outlet wire cable connecting device electric connection, inlet wire cable plug device includes four inlet wire cable binding post, every inlet wire cable binding post includes wall bushing and binding post box respectively, be equipped with four mounting holes on the lateral wall of transfer box main part, every cover is equipped with the correspondence respectively in the mounting hole wall bushing, wall bushing's one end is equipped with first copper line row, and the other end is equipped with the second copper line row, the second copper line row is connected the binding post box, the through-hole has been seted up respectively to the both sides of binding post box, inserts in one side through-hole the second copper line row, the cover is equipped with stainless steel pipe in the opposite side through-hole, be equipped with the wire nose in the binding post box, the second copper line row with the wire nose passes through electrically conductive screw fixed connection, the wire part stretches into in the stainless steel pipe.
Further, the wall bushing comprises a conducting rod, an inner shielding layer, an outer insulating layer and a connecting flange, wherein the conducting rod is electrically connected with the first copper wire row and the second copper wire row, the inner shielding layer is arranged on the periphery of the conducting rod, the inner shielding layer is made of semi-conductive materials, the first copper wire row is partially arranged in the inner shielding layer, the second copper wire row is partially arranged in the inner shielding layer, the connecting flange is sleeved on the inner shielding layer, and the outer insulating layer is arranged on the periphery of the inner shielding layer and on two sides of the connecting flange.
Further, the stainless steel pipe is provided with an internal thread at the pipe orifice, the stainless steel pipe is in threaded connection with a sealing element at the pipe orifice, the sealing element comprises a screw cap and a pipe joint, one end of the pipe joint is in threaded connection with the stainless steel pipe, and the other end of the pipe joint is in threaded connection with the screw cap.
Further, the nut comprises a nut cap body and a connecting nut, a through hole matched with the nut cap body is formed in the middle of the connecting nut cap body, the nut cap body is conical, and a through hole is formed in the middle of the nut cap body.
Further, the nut cap body is an ethylene propylene diene monomer cap body.
After the technical scheme is adopted, the invention has the following advantages:
1. according to the 0.4kV cable quick-switching box provided by the invention, the quick-switching effect on the incoming cable input by the box-type transformer substation and the multi-path 0.4kV outgoing cable output by the incoming cable plugging device and the outgoing cable connecting device is achieved, and the power outage operation time which is originally required to be powered off for 6-8 hours is changed into half-hour power outage; the incoming cable and the outgoing cable are switched through the switching box, so that the problem that the length of the outgoing cable is not enough to be switched to supply power is avoided. The four incoming cable connection terminals are respectively connected with a phase A, a phase B and a phase C three-phase cable and a zero line. When the incoming line cable is switched over, the head of the incoming line cable is inserted into the corresponding incoming line cable wiring terminal, and then the head of the incoming line cable enters the stainless steel tube and is connected with the wire nose, so that the incoming line cable is electrically connected with the wire nose and the wall bushing, the electrical connection speed is high, the electrical connection is good, and the power failure operation time is greatly reduced. In addition, the wall bushing and the wiring terminal box have good external insulation performance, and the external insulation performance is guaranteed to be quickly recovered after the incoming cable is switched. The binding post box can also play its internals' waterproof dirt-proof effect.
2. The inner shielding layer of the wall bushing in the prior art is arranged in the middle of the conducting rod, and two ends of the conducting rod are exposed out of two ends of the inner shielding layer, however, an air gap is easily formed between two ends of the conducting rod and the outer insulating layer, and between a copper wire row at two ends of the conducting rod and the outer insulating layer, so that electric field concentration can be caused, and partial discharge can be caused. According to the invention, the conductive rod is completely coated in the inner shielding layer, and the copper wire row is partially coated in the inner shielding layer, so that on one hand, the problem of connection between the copper wire row and the conductive rod is solved, and a connecting part is not required to connect the copper wire row and the conductive rod; on the other hand, the inner shielding layer is equipotential with the conducting rod and well contacts with the outer insulating layer, so that partial discharge is avoided between the two ends of the conducting rod and the outer insulating layer and between the copper wire rows at the two ends of the conducting rod and the outer insulating layer.
3. A sealing piece is arranged at the pipe orifice of the stainless steel pipe so as to avoid the damage of the transfer box caused by the entry of water and dust into the main body of the transfer box. And the pipe joint is connected with the stainless steel pipe and the pipe joint is connected with the screw cap by adopting threads, so that the sealing element has good sealing performance.
4. The nut cap body is an elastomer, ethylene propylene diene monomer is a preferable material of the nut cap body, and when the nut cap body is not stressed, the through hole at the tip is in a contracted and closed state. When the incoming cable is inserted into the stainless steel tube, the screw cap body is sleeved at the end part of the incoming cable, the through hole at the tip end of the screw cap body is stressed and opened, then the incoming cable is inserted into the nut, the screw cap body is matched with the connecting nut, the incoming cable is continuously inserted until the incoming cable is inserted into the wire nose, in the process, the incoming cable acts on the screw cap body by a friction force, the screw cap body generates a pressure on the connecting nut under the friction force, and the screw cap body wraps the incoming cable tightly under the reaction force of the connecting nut to the screw cap body due to the inclined surface of the contact surface of the screw cap body and the connecting nut, so that water and dust cannot enter the transfer box after the incoming cable is connected.
Drawings
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of a 0.4kV cable quick-transit box in the present invention.
Fig. 2 is a side view of a 0.4kV cable quick-connect box in accordance with the present invention.
Fig. 3 is a schematic structural diagram of an incoming cable plugging device in the present invention.
Fig. 4 is a schematic structural view of a nut in a sealing member of the incoming cable plugging device according to the present invention.
The names of the components marked in the figure are as follows:
1. a transfer case main body; 101. a door; 102. a mounting hole; 2. the incoming cable plugging device; 201. a conductive rod; 202. an inner shielding layer; 203. a connecting flange; 204. an outer insulating layer; 205. a first copper wire row; 206. a second copper wire row; 207. stainless steel tube; 208. a wire nose; 209. a conductive screw; 210. a screw cap; 2101. a screw cap body; 2102. a connecting nut; 211. a pipe joint; 3. and an outgoing cable connecting device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, the invention provides a 0.4kV cable quick-transit box, which comprises a transit box main body 1, an incoming cable plugging device 2 and an outgoing cable connecting device 3.
The transfer box body 1 is a closed shell, and the transfer box body 1 comprises a box door 101. The incoming cable plugging device 2 is connected with a main power supply incoming cable and a standby power supply incoming cable, wherein the main power supply is output by a transformer of a mains supply power grid, and the standby power supply is output by a generator. The outgoing cable connection device 3 connects the outgoing cables. The incoming cable plugging device 2 is electrically connected with the outgoing cable connecting device 3.
The incoming cable plugging device 2 comprises four incoming cable connecting terminals which are respectively connected with a phase A, a phase B and a phase C three-phase cable and a zero line. The incoming cable junction terminal comprises a wall bushing and a junction terminal box. Four mounting holes 102 are formed in one side wall of the transfer box main body 1, and corresponding wall bushings are sleeved in each mounting hole 102 respectively and fixedly connected with the transfer box main body 1 through a connecting flange 203.
As shown in fig. 3, the incoming cable plugging device 2 includes four incoming cable connection terminals including a wall bushing and a connection terminal box.
The wall bushing comprises a conductive rod 201, an inner shielding layer 202 arranged on the periphery of the conductive rod 201, a connecting flange 203 sleeved on the inner shielding layer 202, and outer insulating layers 204 arranged on the periphery of the inner shielding layer 202 and arranged on two sides of the connecting flange 203. One end of the conductive rod 201 is electrically connected with a first copper wire row 205, and the other end is electrically connected with a second copper wire row 206, the first copper wire row 205 is partially disposed in the inner shielding layer 202, and the second copper wire row 206 is partially disposed in the inner shielding layer 202. Since the conductive rod 201 is completely wrapped in the inner shielding layer 202 and the copper wire rows at two ends of the conductive rod 201 are partially wrapped in the inner shielding layer 202, on one hand, the connection problem of the copper wire rows and the conductive rod 201 is solved, and connection parts are not needed to connect the copper wire rows and the conductive rod 201; on the other hand, the inner shielding layer 202 is equipotential with the conductive rod 201 and well contacts with the outer insulating layer 204, so that partial discharge between the two ends of the conductive rod 201 and the outer insulating layer 204 and between the copper wire rows at the two ends of the conductive rod 201 and the outer insulating layer 204 is avoided.
Through holes are respectively formed in two sides of the wiring terminal box, a second copper wire row 206 is inserted into one through hole, a stainless steel pipe 207 is sleeved in the other through hole, a wire nose 208 is arranged in the wiring terminal box, the second copper wire row 206 and the wire nose 208 are fixedly connected through conductive screws 209, and the wire nose 208 partially stretches into the stainless steel pipe 207.
The stainless steel tube 207 is provided with a thread groove on the inner wall of the tube orifice, and the stainless steel tube 207 is connected with a sealing member in a thread way at the tube orifice so as to avoid the damage of the adaptor box caused by the entry of water and dust into the adaptor box main body 1. The sealing member includes a nut 210 and a pipe joint 211, one end of the pipe joint 211 is screw-coupled with the stainless steel pipe 207, and the other end of the pipe joint 211 is screw-coupled with the nut 210.
As shown in fig. 4, the nut 210 includes a nut cap 2101 and a connecting nut 2102, the nut cap 2101 is a silica gel cap, the nut cap 2101 is tapered, and a through hole is provided in the middle of the nut cap 2101. Since the nut cap body 2101 is an elastomer, the through hole at the tip of the nut cap body 2101 is in a contracted closed state when the nut cap body 2101 is not subjected to force. When the incoming cable is inserted into the stainless steel tube 207, the screw cap body 2101 is sleeved at the end part of the incoming cable, the through hole at the tip end of the screw cap body 2101 is stressed and opened, then the incoming cable is inserted into the screw cap 210, the screw cap body 2101 is matched with the connecting screw cap 2102, the incoming cable is continuously inserted until the incoming cable is inserted into the wire nose 208, in the process, the incoming cable acts on the screw cap body 2101 by a friction force, the screw cap body 2101 generates a pressure on the connecting screw cap 2102 under the action of the friction force, and the screw cap body 2101 and the connecting screw cap body 2101 are tightly wrapped by the screw cap body 2101 under the reaction force of the connecting screw cap 2102 to the screw cap body 2101, so that water and dust can not enter the transfer box main body 1 after the incoming cable is connected.
In addition to the above preferred embodiments, the present invention has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined in the appended claims.
Claims (3)
1. The utility model provides a 0.4kV cable quick-speed transfer box, its characterized in that includes transfer box main part, inlet wire cable plug device and outlet wire cable connecting device, inlet wire cable plug device with outlet wire cable connecting device electric connection, inlet wire cable plug device includes four inlet wire cable binding post, every inlet wire cable binding post includes wall bushing and binding post box respectively, be equipped with four mounting holes on the lateral wall of transfer box main part, every cover is equipped with respectively in the mounting hole corresponds wall bushing, wall bushing's one end is equipped with first copper line row, and the other end is equipped with the second copper line row, the second copper line row is connected the binding post box, the through-hole has been seted up respectively to the both sides of binding post box, inserts in one side through-hole the second copper line row, the cover is equipped with the stainless steel pipe in the opposite side through-hole, be equipped with the line nose in the binding post box, the second copper wire row is fixedly connected with the wire nose through conductive screws, the wire nose part stretches into the stainless steel tube, the wall bushing comprises a conductive rod, an inner shielding layer, an outer insulating layer and a connecting flange, the conductive rod is electrically connected with the first copper wire row and the second copper wire row, the inner shielding layer is arranged on the periphery of the conductive rod, the inner shielding layer is a semi-conductive material shielding layer, the first copper wire row part is arranged in the inner shielding layer, the second copper wire row part is arranged in the inner shielding layer, the connecting flange is sleeved on the inner shielding layer, the outer insulating layer is arranged on the periphery of the inner shielding layer and arranged on two sides of the connecting flange, the stainless steel tube is provided with internal threads at a tube orifice, the stainless steel tube is in threaded connection with a sealing element at the tube orifice, the sealing element comprises a screw cap and a pipe joint, one end of the pipe joint is in threaded connection with the stainless steel pipe, and the other end of the pipe joint is in threaded connection with the screw cap.
2. The 0.4kV cable quick transit box of claim 1, wherein the nut comprises a nut body and a connecting nut, a through hole matched with the nut body is provided in the middle of the connecting nut, the nut body is conical, and a through hole is provided in the middle of the nut body.
3. The 0.4kV cable quick transit box of claim 2, wherein the cap body is an ethylene propylene diene monomer cap body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810709721.8A CN109038467B (en) | 2018-07-02 | 2018-07-02 | 0.4kV cable quick transfer box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810709721.8A CN109038467B (en) | 2018-07-02 | 2018-07-02 | 0.4kV cable quick transfer box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109038467A CN109038467A (en) | 2018-12-18 |
| CN109038467B true CN109038467B (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810709721.8A Active CN109038467B (en) | 2018-07-02 | 2018-07-02 | 0.4kV cable quick transfer box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109038467B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635443B (en) * | 2019-10-09 | 2020-12-29 | 国网河北省电力有限公司衡水供电分公司 | Independent power supply standby switching device for special building |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060014462A (en) * | 2004-08-11 | 2006-02-16 | 양희성 | Electric branch box |
| CN201038669Y (en) * | 2007-06-06 | 2008-03-19 | 楼小龙 | Seal ring possessed covered joint and fastening type steel conduit and pipe fitting connection device |
| EP1978616A1 (en) * | 2007-04-06 | 2008-10-08 | Ksb S.A.S | Wall bushing and manufacturing method thereof |
| CN201918679U (en) * | 2010-12-01 | 2011-08-03 | 福建省电力有限公司福州电业局 | 10kV cable transfer box |
| CN203312730U (en) * | 2013-06-14 | 2013-11-27 | 北京合纵科沃尔电力科技有限公司 | High-voltage switchgear cable-wiring wall-bushing connection structure |
| CN103872637A (en) * | 2012-12-10 | 2014-06-18 | 中国核动力研究设计院 | Quick cable connection and sealing device |
| CN206116655U (en) * | 2016-08-29 | 2017-04-19 | 镇江市三维电加热器有限公司 | High temperature heavy current lead -out wire device |
| CN206250718U (en) * | 2016-12-21 | 2017-06-13 | 国网宁夏电力公司银川供电公司 | The transfer box that bypass cable fast insert-pull head is connected with user's side terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208316265U (en) * | 2018-07-02 | 2019-01-01 | 国网浙江慈溪市供电有限公司 | A kind of quick transfer box of 0.4kV cable |
-
2018
- 2018-07-02 CN CN201810709721.8A patent/CN109038467B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060014462A (en) * | 2004-08-11 | 2006-02-16 | 양희성 | Electric branch box |
| EP1978616A1 (en) * | 2007-04-06 | 2008-10-08 | Ksb S.A.S | Wall bushing and manufacturing method thereof |
| CN201038669Y (en) * | 2007-06-06 | 2008-03-19 | 楼小龙 | Seal ring possessed covered joint and fastening type steel conduit and pipe fitting connection device |
| CN201918679U (en) * | 2010-12-01 | 2011-08-03 | 福建省电力有限公司福州电业局 | 10kV cable transfer box |
| CN103872637A (en) * | 2012-12-10 | 2014-06-18 | 中国核动力研究设计院 | Quick cable connection and sealing device |
| CN203312730U (en) * | 2013-06-14 | 2013-11-27 | 北京合纵科沃尔电力科技有限公司 | High-voltage switchgear cable-wiring wall-bushing connection structure |
| CN206116655U (en) * | 2016-08-29 | 2017-04-19 | 镇江市三维电加热器有限公司 | High temperature heavy current lead -out wire device |
| CN206250718U (en) * | 2016-12-21 | 2017-06-13 | 国网宁夏电力公司银川供电公司 | The transfer box that bypass cable fast insert-pull head is connected with user's side terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109038467A (en) | 2018-12-18 |
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