CN102545641A - Method for supplying long-distance and large-current power - Google Patents
Method for supplying long-distance and large-current power Download PDFInfo
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- CN102545641A CN102545641A CN2010105871706A CN201010587170A CN102545641A CN 102545641 A CN102545641 A CN 102545641A CN 2010105871706 A CN2010105871706 A CN 2010105871706A CN 201010587170 A CN201010587170 A CN 201010587170A CN 102545641 A CN102545641 A CN 102545641A
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- busbars
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Abstract
The invention discloses a method for supplying long-distance and large-current power. Busbars between a power plant unit and a step-up transformer are connected by composite shielding insulated copper and aluminum tubular busbars. Busbars between the transformer and high voltage chambers, and busbars among the high voltage chambers are connected by the composite shielding insulated copper and the aluminum tubular busbars. According to the method, the problem that infeasible cables and rectangular conductors are adopted in medium voltage (6 to 35 kV) long-distance and large-current power transmission is solved, the manner of using the composite shielding tubular busbars is improved, the current-carrying capacity and the allowable stress are great, the skin effect is low, the heat dissipation conditions are good, the power consumption is low, the insulating capability and electrical shock resistance are high, and the method is extremely suitable for large-current power transmission. The tubular busbars can be safely touched and have the advantages of no electric discharge, no flashover, high power supply reliability, simple installation, artistic appearance and convenience for maintenance.
Description
Technical field
The present invention relates to a kind of long distance, big electric current method of supplying power to.
Background technology
Along with the increasing of transforming plant main transformer capacity, 6 ~ 10 kilovolts and 35 kilovolts bus rated current of transformer constantly increase (surpassing 3000A), are adopting multicore cable, the multi-slice rectangle conductor big loop of incompatibility operating current in the engineering in the past,
In to press long distance, big electric current transmission of electricity be necessary the link of power supply electric energy to subscriber equipment, importance height, influence surface are big.Like 6 ~ 10 kV transmission lines, be example by carrying rated current 3150A, as adopting cable mode, the cross-section of cable need be selected YJV-6/6kV 3x400mm in the practical application
26, outside diameter of cable De=83 mm, bending radius 15De (1245 mm) be difficult to have satisfied greater than the 3150A ampacity, and cable, cable end insulation level are low, and failure rate is high, and cost of investment is high, and preventive trial is also unreasonable, does not adopt basically at present.
Adopt the multi-slice rectangle conductor big loop of incompatibility operating current; Rectangular bus bar is difficult to solve the bus heating and satisfies electrodynamic requirement technically with on the structure; Cause the increase of supplementary load loss, skin effect coefficient thus; Main transformer outlet side not only has the reinforcing bar heating problem that inductive loop causes in alternating intense magnetic field near the concrete column of the electric power problem of bus bridge own, heating problem, steel framework and bus bridge itself, the basis; In case busbar short-circuit, open bus, Transformer Winding are all damaged, and influence the safe operation of transformer station, the reliability of power supply.
Summary of the invention
The technical problem that the present invention will solve is, a kind of method of supplying power to of growing distance, big electric current is provided, with deficiency such as overcome cable that prior art exists, the cable end insulation level is low, failure rate is high, cost of investment is high, and supplementary load loss are big, power supply reliability is low.
For solveing the technical problem, the present invention adopts following technical scheme: bus connects employing composite shielding insulated copper, aluminum pipe type bus between power plant unit to step-up transformer.
Composite shielding insulated copper, aluminum pipe type bus are adopted in bus connection between bus connection, hyperbaric chamber between said transformer to hyperbaric chamber.
The present invention adopts composite shielding insulated copper, aluminum pipe type bus (abbreviation tube type bus) to replace the method for rectangular bus bar to improve the effective rate of utilization of bus material; Improve the bus mechanical strength, prevent that the person from touching charged bus and metal object and falling and produce phase fault etc. on the bus.For the safe operation of transformer station, improve power supply reliability, reduce the wastage and played positive role.
The characteristics that technology of the present invention has:
The comparison of tube type bus and conventional rectangular bus bar:
1, ampacity is big, and tube type bus is a hollow conductor, and the cross section is big, and the conductive surface electric current distribution is even, copper pipe body conductor Φ 60 * 10mm, sectional area: 3450mm2, ampacity: 3150A, current density 0.9 (A/mm2), rated current temperature rise≤40K.Therefore, tube type bus is particularly suitable for the big loop of operating current, and the conductor current MAXIMUM SELECTION can reach 10000A.
2, kelvin effect is low, power loss is little, and the skin effect coefficient of tube type bus is low, Kf≤1, and AC resistance is little, thereby the power loss of bus is little.If adopt multi-slice rectangle conductor, along with the sheet number increases, 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.
3, radiating condition is good, the temperature difference is low, and tube type bus is a hollow conductor, and bus internal diameter air channel can form hot-air convection naturally, and (draught head of indoor and outdoors can form hot-air convection naturally), radiating condition is good, temperature rise is low.
4, allowable stress [σ] is big, mechanical strength is high, and the allowable stress of tube type bus is 4 times of rectangle, and the short circuit current that can bear is big, and mechanical strength is high, makes bus support span and strengthens.Under 50KA short circuit current situation, Φ 60 * 10mm copper pipe bus span can reach 9 meters, and maximum outreach reaches 12 meters.Because the bus span is big, can directly get into the hyperbaric chamber and be connected with indoor current limiting reactor or 6 ~ 10 kilovolts, 35 kilovolts switch cubicles, the corresponding bus strong point, bus gold utensil and civil engineering framework basis have been reduced.
5, electrical insulation properties is strong, and tube type bus adopts single-phase shield gasket compound inslation mode; Earthing of casing current potential is zero, because electric shield has: (a) make Electric Field Distribution even, (b) CONTROLLED POTENTIAL and restriction electric field; (c) avoid producing partial discharge at insulating surface, (d) conduction Leakage Current and charging current are (e) to characteristics such as the touch voltage of danger protect; The tube type bus Electric Field Distribution is even, and electrical insulation properties is strong.
6, the insulation safety coefficient is high, and tube type bus main insulation material adopts polytetrafluoroethylene, can in 250 ℃～+ 340 ℃, work, and good electric property and chemical stability are arranged, and dielectric loss is little, fire-retardant, ageing-resistant, useful life >=30 year.
7, anti-electric vibration resistance is strong, directly is fixed on tube type bus on the steel framework or on the concrete support, strong sleeve pipe and post insulator are worn in cancellation, have stronger anti-vibration ability.
8, do not receive environmental interference, reliability height, tube type bus is every to be the closed shield insulation mutually, and inner no condensation produces, and has eliminated caused ground connection of extraneous moisture, dust and foreign object and phase fault, and operation has reliability highly.Rectangular bus bar is exposed in the environment, receives people, animal (like mouse etc.) and the accidental contact of other object easily and ground connection and short circuit take place, and is unfavorable for safe operation.
9, the tube type bus framework is simple and clear, layout is clear.In installation, adopted a whole set of new installation coupling and mode, easy for installation, safe and reliable, reasonable price, maintenance workload are few.
The invention solves the infeasible problem of the long distance of middle pressure (6 ~ 35 kV), big electric current transmission of electricity employing cable, rectangular conductor; Improve the composite shielding tube type bus mode that adopts; Ampacity and allowable stress are big; Kelvin effect is low, radiating condition good, power dissipation is little, and insulation and anti-electric vibration resistance are strong, is fit to very much big electric current transmission of electricity; But the tube type bus safe touch, discharge off, no flashover, power supply reliability is high; Install simple, attractive in appearance, easy to maintenance.
The transmission of electricity in active force transformer to 6 kilovolt hyperbaric chamber has always fallen in technology of the present invention in Guizhou Aluminum Factory cogeneration power plant, electric current 3150A goes into operation operation more than a year; Any fault did not take place; Power supply performance and reliability are very good, have reached good effect, the consistent favorable comment of owner.
Claims (2)
1. the method for supplying power to of a long distance, big electric current is characterized in that: bus connects and adopts composite shielding insulated copper, aluminum pipe type bus between power plant unit to step-up transformer.
2. want the method for supplying power to of 1 described long distance, big electric current according to right, it is characterized in that: bus connection between bus connection, hyperbaric chamber between said transformer to hyperbaric chamber, adopt composite shielding insulated copper, aluminum pipe type bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105871706A CN102545641A (en) | 2010-12-14 | 2010-12-14 | Method for supplying long-distance and large-current power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105871706A CN102545641A (en) | 2010-12-14 | 2010-12-14 | Method for supplying long-distance and large-current power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102545641A true CN102545641A (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105871706A Pending CN102545641A (en) | 2010-12-14 | 2010-12-14 | Method for supplying long-distance and large-current power |
Country Status (1)
| Country | Link |
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| CN (1) | CN102545641A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817157Y (en) * | 2005-04-06 | 2006-09-13 | 黄冈兴和铝业有限公司 | Composite shielded copper-aluminium pipe bus bridge |
| CN101022042A (en) * | 2007-03-01 | 2007-08-22 | 罗志昭 | Insulation composite pipe bus and producing method thereof |
| CN201036055Y (en) * | 2007-03-01 | 2008-03-12 | 罗志昭 | Insulation composite pipe bus |
| CN101339824A (en) * | 2008-08-14 | 2009-01-07 | 上海西邦电气有限公司 | Composite insulating tube type bus and method for preparing the same |
-
2010
- 2010-12-14 CN CN2010105871706A patent/CN102545641A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817157Y (en) * | 2005-04-06 | 2006-09-13 | 黄冈兴和铝业有限公司 | Composite shielded copper-aluminium pipe bus bridge |
| CN101022042A (en) * | 2007-03-01 | 2007-08-22 | 罗志昭 | Insulation composite pipe bus and producing method thereof |
| CN201036055Y (en) * | 2007-03-01 | 2008-03-12 | 罗志昭 | Insulation composite pipe bus |
| CN101339824A (en) * | 2008-08-14 | 2009-01-07 | 上海西邦电气有限公司 | Composite insulating tube type bus and method for preparing the same |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |