CN103366872A - Circular shielding insulating bus and machining method thereof - Google Patents
Circular shielding insulating bus and machining method thereof Download PDFInfo
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- CN103366872A CN103366872A CN201310227732XA CN201310227732A CN103366872A CN 103366872 A CN103366872 A CN 103366872A CN 201310227732X A CN201310227732X A CN 201310227732XA CN 201310227732 A CN201310227732 A CN 201310227732A CN 103366872 A CN103366872 A CN 103366872A
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Abstract
The invention relates to a circular shielding insulating bus, which has the advantages of high carrying capacity, good heat dissipation, low temperature rise, strong electric insulation performance, no environmental disturbance and high reliability. The circular shielding insulating bus comprises a circular conductor and an outer layer sheath, wherein a plurality of insulating shielding layers are arranged between the circular conductor and the outer layer sheath and consist of insulating layers and shielding layers; each insulating layer comprises two polytetrafluoroethylene layers and a thermal shrinkage sheath from inside to outside; and silicone oil is uniformly brushed between the polytetrafluoroethylene and the thermal shrinkage sheath.
Description
Technical field
The invention belongs to the High-Voltage Electrical Appliances field, be specifically related to a kind of circular shielding insulation bus.
Background technology
Development along with domestic economy, the power load of each transformer station is increased sharply thereupon, system running current is increasing, load more and more concentrated, the main transformer capacity of transformer station is also increasing, and adopted the connected mode of multi-disc rectangle busbars more or directly used cable to connect in the engineering in the past, the working method that these need not well adapt to large electric current (more than the 3000A) causes that simultaneously supplementary load loss are large, CURRENT DISTRIBUTION is uneven, the skin effect coefficient increases phenomenons such as causing current capacity decline and contact heating more and more obvious.
Domestic bus is through technique improvement, so that insulating barrier all adopts polytetrafluoroethylene to hold mostly.The insulation processing that the shortcoming of isolated bus connects in the middle of mainly being exactly, single pipe mother's insulation all is to carry out before dispatching from the factory, transition joint be exactly for the single pipe in scene female with the docking of single pipe mother, after finishing, docking does again the insulation processing of transition joint, but the humidity of surrounding environment and temperature all can not meet, even manual hold the time may bring impurity into so that the female electrical insulation properties of pipe reduces greatly.
Summary of the invention
Technical problem to be solved by this invention is the circular shielding insulation bus for above drawback provides that a kind of ampacity is large, good heat dissipation, temperature rise are low, electrical insulation properties by force, is not subjected to environmental interference, reliability is high.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of circular shielding insulation bus comprises round conductor and outer protective sleeve, wherein, is provided with the multilayer insulation screen between described round conductor and outer protective sleeve, and described insulation screen length is less than round conductor length.
Above-mentioned a kind of circular shielding insulation bus, wherein, described insulation screen is comprised of insulating barrier and screen, and described insulating barrier comprises two-layer polytetrafluoroethylene and sheath shrinkable sleeve from inside to outside, even coating silicon oil between polytetrafluoroethylene and the sheath shrinkable sleeve.
Above-mentioned a kind of circular shielding insulation bus, wherein, the length of described every layer of insulation screen is evenly successively decreased from inside to outside.
Above-mentioned a kind of circular shielding insulation bus wherein, is provided with passage in the described round conductor.
The processing method of above-mentioned a kind of circular shielding insulation bus, its method is as follows:
1. the round conductor two ends closely hold one deck aluminium foil as screen at conductive surface after respectively staying 20cm;
2. after outside aluminium foil, holding two-layer polytetrafluoroethylene and even coating silicon oil, outside polytetrafluoroethylene, hold sheath shrinkable sleeve as insulating barrier;
3. above-mentioned steps 1,2 can be considered first insulation screen, after this respectively stays 5cm at each insulation screen two ends, repeating step 1,2 carry out second, third, the making of fourth class insulation screen, the concrete number of plies is as the criterion with actual needs;
4. outside the outermost layer insulation screen, hold and hold the outer protective sleeve of one deck take the polyolefin high polymer as material after the braiding copper mesh is done grounding.
Beneficial effect of the present invention is:
(1) ampacity is large
Buses of insulation tubes is hollow conductor, and surface area is large, and the conductive surface electric current distribution is even.Therefore, isolated bus is particularly suitable for the large loop of operating current.
(2) kelvin effect is low, power loss is little
The skin effect coefficient of buses of insulation tubes is low, Kf≤1, and AC resistance is little, thereby the power loss of bus is little.If the employing multi-slice rectangle conductor, along with the increase of sheet number, skin effect coefficient continues to increase, and the effective-current amount in unit cross section descends, and CURRENT DISTRIBUTION is inhomogeneous between sheet and the sheet, and supplementary load loss strengthen, and radiating condition is poor.
(3) radiating condition is good, temperature rise is low
Buses of insulation tubes is hollow conductor, bus internal diameter air channel energy self-assembling formation hot-air convection, and the draught head of indoor and outdoors, energy self-assembling formation hot-air convection, radiating condition is good, thereby has greatly improved power supplying efficiency.
(4) allowable stress [σ] is large, and mechanical strength is high
The allowable stress of buses of insulation tubes is 4 times of rectangular bus bar, and the short circuit current that can bear is large, and mechanical strength is high, strengthens so that bus supports span.In the situation that 50KA short circuit current, the unsettled span of Φ 100 * 5mm isolated bus reaches 9 meters, utilize bus bar cupport to support, the span of bus can reach 13 meters, because the bus span is large, can directly enter the hyperbaric chamber and be connected with indoor current limiting reactor or 10 KV switch cabinets, reduce corresponding post insulator, bus gold utensil and civil engineering framework
The basis.
(5) electrical insulation properties is strong
Buses of insulation tubes adopts the closed shield insulation mode, and earthing of casing current potential is zero, because electric shield has: a. makes Electric Field Distribution even; B. control current potential and restriction electric field; C. avoid producing partial discharge at insulating surface; D. conduct leakage current and charging current; E. to characteristics such as the touch voltage of danger protect, therefore the insulation tubular bus Electric Field Distribution of this band shielding is even, electrical insulation properties is strong.
(6) the insulating material heat-resistance coefficient is high
Buses of insulation tubes main insulation material adopts polytetrafluoroethylene, can work in-250 ℃～+ 250 ℃, and good electric property and chemical stability are arranged, and dielectric loss is little, fire-retardant, ageing-resistant, useful life 〉=40 year.
(7) anti-electrical equipment vibration resistance is strong
Directly buses of insulation tubes is fixed on the steel framework or on the concrete support, cancellation wall bushing and post insulator have stronger anti-vibration ability.
(8) be not subjected to environmental interference, reliability is high
The every of buses of insulation tubes is the lock shield insulation mutually, and be inner without the condensation generation, and eliminated extraneous moisture, the caused ground connection of dust and foreign object and phase fault, and operation has the reliability of height.
Description of drawings
Fig. 1 is front view of the present invention
Fig. 2 is cutaway view of the present invention
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Example one
The circular shielding insulation bus of a kind of 10KV as shown in the figure, comprise round conductor 1 and outer protective sleeve 2, be provided with circular passage 4 in the round conductor 1, round conductor 1 two ends closely hold one deck insulation screen 3 at conductive surface after respectively staying 20cm, wherein, insulation screen 3 is comprised of insulating barrier 31 and screen 32, and insulating barrier 31 comprises two-layer polytetrafluoroethylene 311 and sheath shrinkable sleeve 312 from inside to outside, even coating silicon oil between polytetrafluoroethylene 311 and the sheath shrinkable sleeve 312.After this respectively stay 5cm at each insulation screen 3 two ends, carry out second, third, the making of the 4th insulation screen, outside the 4th insulation screen, do outer protective sleeve 2 take the polyolefin high polymer as material, and the 4th insulation screen held braiding copper mesh 5 do grounding.
Its manufacture method is as follows:
1. the round conductor two ends closely hold one deck aluminium foil as screen at conductive surface after respectively staying 20cm;
2. after outside aluminium foil, holding two-layer polytetrafluoroethylene and even coating silicon oil, outside polytetrafluoroethylene, hold sheath shrinkable sleeve as insulating barrier;
3. above-mentioned steps 1,2 can be considered first insulation screen, after this respectively stays 5cm at each insulation screen two ends, repeating step 1,2 carry out second, third, the making of the 4th insulation screen;
4. outside the 4th layer of insulation screen, hold and hold the outer protective sleeve of one deck take the polyolefin high polymer as material after the braiding copper mesh is done grounding.
Example two
The circular shielding insulation bus of a kind of 35KV as shown in the figure, comprise round conductor 1 and outer protective sleeve 2, be provided with circular passage 4 in the round conductor 1, round conductor 1 two ends closely hold one deck insulation screen 3 at conductive surface after respectively staying 20cm, wherein, insulation screen 3 is comprised of insulating barrier 31 and screen 32, and insulating barrier 31 comprises two-layer polytetrafluoroethylene 311 and sheath shrinkable sleeve 312 from inside to outside, even coating silicon oil between polytetrafluoroethylene 311 and the sheath shrinkable sleeve 312.After this respectively stay 5cm at each insulation screen 3 two ends, carry out second, third, the making of the the the 4th, the 5th, the 6th, the 7th, the 8th insulation screen, outside the 8th insulation screen, do outer protective sleeve 2 take the polyolefin high polymer as material, and the 8th insulation screen held braiding copper mesh 5 do grounding.
Its manufacture method is as follows:
1. the round conductor two ends closely hold one deck aluminium foil as screen at conductive surface after respectively staying 20cm;
2. after outside aluminium foil, holding two-layer polytetrafluoroethylene and even coating silicon oil, outside polytetrafluoroethylene, hold sheath shrinkable sleeve as insulating barrier;
3. above-mentioned steps 1,2 can be considered first insulation screen, after this respectively stays 5cm at each insulation screen two ends, repeating step 1,2 carry out second, third, the making of the 4th, the 5th, the 6th, the 7th, the 8th insulation screen;
4. outside the 8th layer of insulation screen, hold and hold the outer protective sleeve of one deck take the polyolefin high polymer as material after the braiding copper mesh is done grounding.
In sum, beneficial effect of the present invention is:
(1) ampacity is large
Buses of insulation tubes is hollow conductor, and surface area is large, and the conductive surface electric current distribution is even.Therefore, isolated bus is particularly suitable for the large loop of operating current.
(2) kelvin effect is low, power loss is little
The skin effect coefficient of buses of insulation tubes is low, Kf≤1, and AC resistance is little, thereby the power loss of bus is little.If the employing multi-slice rectangle conductor, along with the increase of sheet number, skin effect coefficient continues to increase, and the effective-current amount in unit cross section descends, and CURRENT DISTRIBUTION is inhomogeneous between sheet and the sheet, and supplementary load loss strengthen, and radiating condition is poor.
(3) radiating condition is good, temperature rise is low
Buses of insulation tubes is hollow conductor, bus internal diameter air channel energy self-assembling formation hot-air convection, and the draught head of indoor and outdoors, energy self-assembling formation hot-air convection, radiating condition is good, thereby has greatly improved power supplying efficiency.
(4) allowable stress [σ] is large, and mechanical strength is high
The allowable stress of buses of insulation tubes is 4 times of rectangular bus bar, and the short circuit current that can bear is large, and mechanical strength is high, strengthens so that bus supports span.In the situation that 50KA short circuit current, the unsettled span of Φ 100 * 5mm isolated bus reaches 9 meters, utilize bus bar cupport to support, the span of bus can reach 13 meters, because the bus span is large, can directly enter the hyperbaric chamber and be connected with indoor current limiting reactor or 10 KV switch cabinets, reduce corresponding post insulator, bus gold utensil and civil engineering framework
The basis.
(5) electrical insulation properties is strong
Buses of insulation tubes adopts the closed shield insulation mode, and earthing of casing current potential is zero, because electric shield has: a. makes Electric Field Distribution even; B. control current potential and restriction electric field; C. avoid producing partial discharge at insulating surface; D. conduct leakage current and charging current; E. to characteristics such as the touch voltage of danger protect, therefore the insulation tubular bus Electric Field Distribution of this band shielding is even, electrical insulation properties is strong.
(6) the insulating material heat-resistance coefficient is high
Buses of insulation tubes main insulation material adopts polytetrafluoroethylene, can work in-250 ℃～+ 250 ℃, and good electric property and chemical stability are arranged, and dielectric loss is little, fire-retardant, ageing-resistant, useful life 〉=40 year.
(7) anti-electrical equipment vibration resistance is strong
Directly buses of insulation tubes is fixed on the steel framework or on the concrete support, cancellation wall bushing and post insulator have stronger anti-vibration ability.
(8) be not subjected to environmental interference, reliability is high
The every of buses of insulation tubes is the lock shield insulation mutually, and be inner without the condensation generation, and eliminated extraneous moisture, the caused ground connection of dust and foreign object and phase fault, and operation has the reliability of height.
Claims (5)
1. a circular shielding insulation bus comprises round conductor and outer protective sleeve, it is characterized by, and is provided with the multilayer insulation screen between described round conductor and outer protective sleeve, and described insulation screen length is less than round conductor length.
2. a kind of circular shielding insulation bus as claimed in claim 1, it is characterized by, described insulation screen is comprised of insulating barrier and screen, and described insulating barrier comprises two-layer polytetrafluoroethylene and sheath shrinkable sleeve from inside to outside, even coating silicon oil between polytetrafluoroethylene and the sheath shrinkable sleeve.
3. a kind of circular shielding insulation bus as claimed in claim 1 is characterized by,, the length of described every layer of insulation screen is evenly successively decreased from inside to outside.
4. a kind of circular shielding insulation bus as claimed in claim 1 is characterized by, and is provided with passage in the described round conductor.
5. such as the processing method of claim 1,2,3,4 described a kind of circular shielding insulation buses, it is characterized by, its method is as follows:
1. the round conductor two ends closely hold one deck aluminium foil as screen at conductive surface after respectively staying 20cm;
2. after outside aluminium foil, holding two-layer polytetrafluoroethylene and even coating silicon oil, outside polytetrafluoroethylene, hold sheath shrinkable sleeve as insulating barrier;
3. above-mentioned steps 1,2 can be considered first insulation screen, after this respectively stays 5cm at each insulation screen two ends, repeating step 1,2 carry out second, third, the making of fourth class insulation screen, the concrete number of plies is as the criterion with actual needs;
4. outside the outermost layer insulation screen, hold and hold the outer protective sleeve of one deck take the polyolefin high polymer as material after the braiding copper mesh is done grounding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310227732.XA CN103366872B (en) | 2013-06-07 | 2013-06-07 | A kind of circular shield isolated bus |
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| CN201310227732.XA CN103366872B (en) | 2013-06-07 | 2013-06-07 | A kind of circular shield isolated bus |
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| CN103366872B CN103366872B (en) | 2016-06-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900327A (en) * | 2015-06-27 | 2015-09-09 | 深州市远征氟塑料有限公司 | Integrated dry-insulated tubular busbar and manufacturing method thereof |
| CN105931699A (en) * | 2016-05-25 | 2016-09-07 | 江苏中鹏电气有限公司 | Tubular type wind power bus-bar with rated voltage of 690/1,000V, installation device and bus-bar production process thereof |
| CN106057294A (en) * | 2016-05-25 | 2016-10-26 | 江苏中鹏电气有限公司 | Tubular composite shielded and insulated bus and making process thereof |
| CN111128463A (en) * | 2019-12-31 | 2020-05-08 | 江苏江扬电缆有限公司 | Power cable for ocean exploration and production process |
| CN111138862A (en) * | 2019-12-31 | 2020-05-12 | 江苏江扬电缆有限公司 | Silicone rubber belt and underwater cable comprising same |
| CN111334048A (en) * | 2019-12-31 | 2020-06-26 | 江苏江扬电缆有限公司 | Silicone rubber sheath and cable prepared by applying same |
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| CN201732615U (en) * | 2009-12-30 | 2011-02-02 | 安徽精工电缆桥架有限公司 | Crosslinked insulated copper tube bus |
| CN201773637U (en) * | 2010-04-29 | 2011-03-23 | 陈炜 | Composite insulating tubular bus |
| US20120168197A1 (en) * | 2011-01-04 | 2012-07-05 | Primecon Technology Ltd. | Coaxial cable structure with extruded shielding layer |
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Patent Citations (6)
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| CN201732615U (en) * | 2009-12-30 | 2011-02-02 | 安徽精工电缆桥架有限公司 | Crosslinked insulated copper tube bus |
| CN201773637U (en) * | 2010-04-29 | 2011-03-23 | 陈炜 | Composite insulating tubular bus |
| US20120168197A1 (en) * | 2011-01-04 | 2012-07-05 | Primecon Technology Ltd. | Coaxial cable structure with extruded shielding layer |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900327A (en) * | 2015-06-27 | 2015-09-09 | 深州市远征氟塑料有限公司 | Integrated dry-insulated tubular busbar and manufacturing method thereof |
| CN104900327B (en) * | 2015-06-27 | 2016-09-28 | 深州市远征氟塑料有限公司 | The manufacture method of integral type dry type insulating tube type busbar |
| CN105931699A (en) * | 2016-05-25 | 2016-09-07 | 江苏中鹏电气有限公司 | Tubular type wind power bus-bar with rated voltage of 690/1,000V, installation device and bus-bar production process thereof |
| CN106057294A (en) * | 2016-05-25 | 2016-10-26 | 江苏中鹏电气有限公司 | Tubular composite shielded and insulated bus and making process thereof |
| CN111128463A (en) * | 2019-12-31 | 2020-05-08 | 江苏江扬电缆有限公司 | Power cable for ocean exploration and production process |
| CN111138862A (en) * | 2019-12-31 | 2020-05-12 | 江苏江扬电缆有限公司 | Silicone rubber belt and underwater cable comprising same |
| CN111334048A (en) * | 2019-12-31 | 2020-06-26 | 江苏江扬电缆有限公司 | Silicone rubber sheath and cable prepared by applying same |
| CN111128463B (en) * | 2019-12-31 | 2021-07-27 | 江苏江扬电缆有限公司 | Power cable for ocean exploration and production process |
| CN111334048B (en) * | 2019-12-31 | 2022-04-15 | 江苏江扬电缆有限公司 | Silicone rubber sheath and cable prepared by applying same |
| CN111138862B (en) * | 2019-12-31 | 2022-04-19 | 江苏江扬电缆有限公司 | Silicone rubber belt and underwater cable comprising same |
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| CN103366872B (en) | 2016-06-22 |
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