CN101145677A - Special gas insulation combined appliance for electric railroad - Google Patents
Special gas insulation combined appliance for electric railroad Download PDFInfo
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- CN101145677A CN101145677A CNA2007100660904A CN200710066090A CN101145677A CN 101145677 A CN101145677 A CN 101145677A CN A2007100660904 A CNA2007100660904 A CN A2007100660904A CN 200710066090 A CN200710066090 A CN 200710066090A CN 101145677 A CN101145677 A CN 101145677A
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- circuit breaker
- isolating
- contact system
- silicon rubber
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Abstract
A gas insulated combined electric appliance specially used in an electric railway comprises a circuit breaker, an isolation/grounding switch, a silicon rubber insulated connecting terminal, a bushing type current transformer, and an under frame. The circuit breaker and an operating mechanism thereof and the isolation/grounding switch are arranged in a gas-sealed outer housing, the upper end of the circuit breaker is respectively connected with the isolation/grounding switch and the wire-in and wire-out silicon rubber insulated connecting terminal, the bushing type current transformer is arranged on the wire-in and wire-out silicon rubber insulated connecting terminal, which is respectively connected with the input terminal and the output terminal of a user' device via a main power line. The invention has a single-phase combined structure, and the fundamental elements can be combined into different wiring arrangements to meet the requirements of different users. The gas insulated switchgear provided in the invention realizes more flexible modularization, has good economical efficiency, and is easy to meet the requirements of the construction, reconstruction and operation of current transformer stations, including reduced floor area, saved investment, improved reliability and convenient maintenance and management.
Description
Technical field
The invention belongs to electric railway special switch equipment technical field, is a kind of special gas insulation combined appliance for electric railroad.
Background technology
Open type electric railway section post, switching station switchgear are to be linked together by high-voltage conducting wires by independent components such as open type circuit breaker, open type isolating switch and earthed switch, current transformer, lightning arrester, voltage transformers at present, its shortcoming is that floor space is big, the concrete foundation consumption is big, the expense height, it is big to be affected by the external environment, and product reliability is poor.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, function admirable, install and Maintenance and Repair convenient, take up an area of and quantities few, the special gas insulation combined appliance for electric railroad that production cost is relatively cheap again.It is the electric railway special product, can be widely used in electric railway section post, switching station, uses mainly as the power equipment of electric railway and control, protection and the measurement of transmission line.
The present invention is single-phase fabricated structure, and primary element can be combined into different connection plans, to satisfy the requirement of different user.Gas-insulated switchgear provided by the invention has been realized modularization more flexibly, and economy is strong, dwindles floor space in be content with very little present transformer substation construction, transformation and the running, reduces investment outlay, improves reliability, is convenient to maintenance management.Along with the development of modern power electronics technology, profile change, the quality of many products are reduced a lot, for the most equipment of electric railway transformer station is combined the condition created.
Purpose of the present invention realizes by following technical measures:
A kind of special gas insulation combined appliance for electric railroad, comprise circuit breaker, isolating/grounding switch, the silicon rubber insulation splicing ear, bushing current transformer, primary elements such as underframe, underframe is installed on the basis, circuit breaker is connected on the underframe, it is characterized in that: with circuit breaker and operating mechanism thereof, isolating/grounding switch is installed in the shell body of air seal, the circuit breaker upper end is connected with turnover line silicon rubber insulation splicing ear with isolating/grounding switch respectively, installation sleeve tubular type current transformer on turnover line silicon rubber insulation splicing ear, turnover line silicon rubber insulation splicing ear is connected to the input and the output of user's set respectively by main power line.
In the housing of described circuit breaker the air seal arc control device of a horizontal arrangement, arc control device are single pressure air pressing type structure, be respectively equipped with the fixed contact system in the arc control device, moving contact system and isolating switch Mume flower contact system three parts, horizontally disposed supporting insulator is separately fixed at the both sides in the housing, the fixed contact system is connected with supporting insulator, the moving contact system is connected with supporting insulator, isolating switch plum blossom fixed contact system place respectively moving contact system and fixed contact system top and from the housing both sides draw place isolating/grounding switch moving contact system under; The moving contact system is connected with the circuit breaker operation mechanism of being made up of connecting rod, mechanism's output toggle arm, input connecting lever, tripping spring connecting lever, tripping spring, spring operating mechanism by pull bar.
Described fixed contact system mainly comprises static contact seat, cooling cell, finger-type fingertip, quiet arc contact, attachment screw member.
Described moving contact system mainly comprises shading ring, contact bearing, pull bar, cylinder, moving arcing contact, banded fingertip, spout, pressing plate and screw member.
The air seal arc control device of described circuit breaker adopt SF6 gas as insulation and arc-extinguishing medium.
Described circuit breaker operation mechanism is located in mechanism's control box, and spring operating mechanism links together mechanism's output toggle arm, circuit breaker input connecting lever, tripping spring connecting lever and tripping spring successively by connecting rod.
Described isolating/grounding switch places in the housing of air seal, the upper end shell flange at 30 ° of angles of inclination is connected with turnover line silicon rubber insulation splicing ear by disc insulator respectively, place the static contact isolation switch system of disc insulator upper end to be connected with conducting rod, place the isolating switch moving contact system of disc insulator lower end to be connected with insulation rotating shaft on being contained in the air seal housing, the insulation rotating shaft other end is connected with isolating/grounding switch mechanism control box; The earthed switch fixed contact is connected with the housing of air seal by sealing flange.
Described bushing current transformer is sleeved on the turnover line silicon rubber insulation splicing ear and with shell flange fixedlys connected.
Described breaker mechanism control box is arranged at the right side of circuit breaker.
Described isolating/grounding switch mechanism control box is arranged at the housing both sides of air seal respectively.
The advantage of gas insulated combined electrical equipment provided by the invention is:
1), circuit breaker, isolating switch and earthed switch etc. are installed in the metal enclosed gas isolated shell, adopt integrated design, thereby volume significantly reduces, save floor space.Simplified element, not needing line side isolating switch and earthed switch are set again, significantly reduced insulation against ground sleeve pipe and insulation column number, only is 30%～50% of conventional equipment, this has also reduced insulation column because of pollution causes the probability of flashover over the ground, helps to improve reliability of operation.
2), use the controllable operating technology to make the circuit breaker can phase-splitting operation under various load behaviors and fault condition more exactly, reduced closing overvoltage, impulse current or dammed, thereby cancelled the switching-on resistance of circuit breaker.
3) function that, has on-line monitoring, repair based on condition of component and reliable data communication.
4), isolating/grounding switch adopts combined floodgate, disconnection, ground connection three Position Design, a shared operating mechanism isolating switch of operation and an earthed switch, transducer can accurately be informed the location status of switch.
5), be a kind of first and second equipment is installed in factory, is tested be transported to on-the-spot equipment after finishing again, only need carry out simple cable at the scene and connect and just can move.
6), each equipment room connecting line distance obviously shortens, so floor space reduces.
7), use the silicon rubber insulation sleeve pipe.The silicon rubber insulation sleeve pipe has good electric and mechanical performance: internal layer injects the tubular pillar that glass fibre is made with epoxy resin, has guaranteed machinery and dielectric strength; And outer bag has guaranteed as outdoor electric properties such as creepage distances with silicon rubber; Surface hydrophobicity prevents to form moisture film and deposition of solid, exempts cleaning; Outside or internal flashover can not cause the sleeve pipe explosion, and casing wt alleviates about 40%.
8), adopt bushing current transformer, be convenient to install.
9), owing to be the circuit breaker of a phase to be added isolating switch and earthed switch is placed in the SF6 sealed compartment as a module, each has independently shell mutually, it can single-phasely independently use, also can use together by making up the back three-phase, its reliability and flexibility all improve greatly, in case line failure, investigation, repair time and power failure scope are all dwindled greatly.This is more suitable for the requirement of electric railway electric power system to " flexibility and reliability ".Also met the requirement that the electric railway power system development is tending towards hommization and sustainableization development more.
10), the basis is littler, quantities reduces, concrete amount also reduces thereupon.
11), the secondary connecting line is plug-in type design, reduced the on-site installation work amount.
Description of drawings
Fig. 1 is a special gas insulation combined appliance for electric railroad profile schematic diagram provided by the invention;
Fig. 2 is the special gas insulation combined appliance for electric railroad structural representation;
Fig. 3 is circuit breaker one pole arc control device and operating mechanism structural representation thereof;
Fig. 4 is isolating/grounding switch, turnover line silicon rubber insulation splicing ear, bushing current transformer structural representation.
Embodiment
Below in conjunction with drawings and Examples this special gas insulation combined appliance for electric railroad is described further.
Embodiment
Shown in Fig. 1,2,4, gas insulated combined electrical equipment is made up of circuit breaker 9, isolating/grounding switch 4, turnover line silicon rubber insulation splicing ear 1, bushing current transformer 2, breaker mechanism control box 6 and control cabinet 8, isolating/grounding switch operating mechanism case 3, underframe 7.The underframe that metal material is made adopts 10# channel-section steel, steel pipe, steel plate to make, and makes that the globality of this product is good.Main power line is connected to the input and the output of user's set by turnover line silicon rubber insulation splicing ear 1.Breaker mechanism control box 6 and control cabinet 8 are arranged on the right side and underframe column of circuit breaker, and isolating/grounding switch operating mechanism case is arranged at the housing both sides.
As shown in Figure 3, be circuit breaker one pole arc control device and operating mechanism structural representation thereof: the arc-extinguishing chamber of circuit breaker horizontal arrangement, be installed in the housing 10 of air seal, be located on supporting insulator 13 and 21 and be separately fixed at both sides in the housing 10.Spring operating mechanism 19 is located in mechanism's control box 6, by connecting rod 16 mechanism's output toggle arm 17 and circuit breaker input connecting lever 14, tripping spring connecting lever 15, tripping spring 18 are linked together, connecting rod 16, circuit breaker input connecting lever 14, tripping spring connecting lever 15, tripping spring place in the outer protecting crust of connecting lever case and the mechanism's control box.This layout makes the compact conformation of circuit breaker, and volume is little, adopts direct connected mode, and not only transmission link is few, and the stress of circuit breaker is good, the efficient height.
Arc-extinguishing chamber of circuit breaker is made up of fixed contact system 20, moving contact system 12, isolating switch plum blossom fixed contact system 11 and 21 3 parts respectively, and isolating switch plum blossom fixed contact system places the upper end of fixed contact system 20, moving contact system 12.Fixed contact system 20 mainly is made up of static contact seat, cooling cell, finger-type fingertip, quiet arc contact, attachment screw etc.Moving contact system 12 mainly is made up of shading ring, contact bearing, pull bar, cylinder, moving arcing contact, banded fingertip, spout, pressing plate and screw etc.
The arc control device of circuit breaker are single pressure air pressing type structure, and extinguish arcs does not depend on the size of arc energy, thereby large and small electric current is all had good connecting-disconnecting function, arcing time equal extinguish arcs reliably in 6～18ms.
The principle of its arc extinguishing is:
When circuit breaker was in "on" position and prepares separating brake, at this moment quiet arc contact and moving arcing contact were all closed.When circuit breaker is received the separating brake order, under the effect of spring operating mechanism 19, lead agency output toggle arm 17, by connecting rod 16 the input connecting lever 14 of circuit breaker is moved clockwise, the moving contact system 12 that drives circuit breaker simultaneously moves right, shading ring, the contact bearing, pull bar, cylinder, moving arcing contact, banded fingertip, parts such as spout are in motion process, but the dynamic air cylinder of moving contact system is done relative motion to static touch base, gas in the cylinder is compressed, the gas outer with cylinder forms pressure differential, at this moment the quiet arc contact at first separates, moving arcing contact still keeps in touch, therefore can not produce electric arc between the sound arcing contact, can guarantee that the sound arcing contact can be by arc erosion.When moving arcing contact begins to disconnect, the sulfur hexafluoride gas of high pressure brushes electric arc strongly by spout forces electric arc to extinguish when the current over-zero, in case disjunction finishes, this pressure differential disappears soon, the air cylinder external and internal pressure restores balance, because on the static contact seat non-return valve is housed, the pressure differential during combined floodgate is very little.
Its operation principle is:
1) sub-switching operation
All energy storage of the switching-in spring of mechanism and tripping spring 18 during combined floodgate, it is charged after switching winding is received the separating brake order, trip electromagnet is by excitatory, mechanism's output toggle arm and circuit breaker input connecting lever apply clockwise turning moment by tripping spring, under the effect of turning moment, mechanism's output toggle arm and circuit breaker input connecting lever drivening rod move clockwise, and the moving contact system 12 that drives circuit breaker simultaneously moves right, until finishing sub-switching operation.
2) closing operation
It is charged after closing coil is received the order of closing a floodgate, making electromagnet is by excitatory, mechanism's output toggle arm 17 and circuit breaker input connecting lever 14 apply under the effect of anticlockwise turning moment at switching-in spring, mechanism's output toggle arm and circuit breaker input connecting lever drivening rod carry out the counter clockwise direction motion, the moving contact system 12 that drives circuit breaker simultaneously is to left movement, until finishing closing operation.
Needs according to user's operation can have multiple pattern, as turnover line silicon rubber insulation splicing ear two ends while installation sleeve tubular type current transformer, perhaps any end installation sleeve tubular type current transformer.
As shown in Figure 4, isolating/grounding switch, turnover line silicon rubber insulation splicing ear, the bushing current transformer structural representation, described isolating/grounding switch places in the housing 23 of air seal, 30 ° of angles of shell flange inclination, upper end and disc insulator 30, turnover line silicon rubber insulation splicing ear 1 connects with bolt by the hole on the flange 31, fixed contact system 32 places disc insulator 30 upper ends to be connected with conducting rod 33, isolating/grounding switch moving contact system 26 and 27 places disc insulator 30 lower ends, be connected with flange 29 by insulation rotating shaft 28 usefulness bolts with housing 23 1 sides, be connected with isolating/grounding switch operating mechanism case 3 more at last, earthed switch fixed contact 25 is connected with housing 23 by sealing flange 24, and bushing current transformer 2 is inserted in turnover line silicon rubber insulation splicing ear 1 back and is connected with flange 31 with bolt.
Shown in Figure 4 is that isolating switch/earthed switch moving contact is an open position, when isolating switch closes a floodgate, drive the insulation rotating shaft by the motion of isolating/grounding switch operating mechanism and do the clockwise direction rotation, moving contact 27 moves down under the drive of tooth bar, finishes closing operation until inserting isolating switch plum blossom fixed contact 11 and 22.When the isolating switch separating brake, drive insulation rotating shaft 28 by the operating mechanism motion and do rotation counterclockwise, moving contact 27 moves up under the drive of tooth bar, draws back certain distance between the dynamic/static contact radome, until finishing sub-switching operation.
When earthed switch closes a floodgate at needs, drive insulation rotating shaft 28 by the operating mechanism motion and do contrary clockwise direction rotation, moving contact 27 moves up under the drive of tooth bar, in inserting earthed switch fixed contact 25.
Claims (10)
1. special gas insulation combined appliance for electric railroad, comprise circuit breaker, isolating/grounding switch, the silicon rubber insulation splicing ear, bushing current transformer, primary elements such as underframe, underframe is installed on the basis, circuit breaker is connected on the underframe, it is characterized in that: with circuit breaker and operating mechanism thereof, isolating/grounding switch is installed in the shell body of air seal, the circuit breaker upper end is connected with turnover line silicon rubber insulation splicing ear with isolating/grounding switch respectively, installation sleeve tubular type current transformer on turnover line silicon rubber insulation splicing ear, turnover line silicon rubber insulation splicing ear is connected to the input and the output of user's set respectively by main power line.
2. special gas insulation combined appliance for electric railroad according to claim 1, it is characterized in that: the air seal arc control device that in the housing of circuit breaker are a horizontal arrangement, arc control device are single pressure air pressing type structure, be respectively equipped with the fixed contact system in the arc control device, moving contact system and isolating switch Mume flower contact system three parts, horizontally disposed supporting insulator is separately fixed at the both sides in the housing, the fixed contact system is connected with supporting insulator, the moving contact system is connected with supporting insulator, isolating switch plum blossom fixed contact system place respectively moving contact system and fixed contact system top and from the housing both sides draw place isolating/grounding switch moving contact system under; The moving contact system is connected with the circuit breaker operation mechanism of being made up of connecting rod, mechanism's output toggle arm, input connecting lever, tripping spring connecting lever, tripping spring, spring operating mechanism by pull bar.
3. special gas insulation combined appliance for electric railroad according to claim 2 is characterized in that: the fixed contact system mainly comprises members such as static contact seat, cooling cell, finger-type fingertip, quiet arc contact, attachment screw.
4. special gas insulation combined appliance for electric railroad according to claim 2 is characterized in that: the moving contact system mainly comprises members such as shading ring, contact bearing, pull bar, cylinder, moving arcing contact, banded fingertip, spout, pressing plate and screw.
5. special gas insulation combined appliance for electric railroad according to claim 2 is characterized in that: the air seal arc control device of circuit breaker adopt SF6 gas as insulation and arc-extinguishing medium.
6. special gas insulation combined appliance for electric railroad according to claim 2, it is characterized in that: circuit breaker operation mechanism is located in mechanism's control box, and spring operating mechanism links together mechanism's output toggle arm, circuit breaker input connecting lever, tripping spring connecting lever and tripping spring successively by connecting rod.
7. special gas insulation combined appliance for electric railroad according to claim 1, it is characterized in that: isolating/grounding switch places in the housing of air seal, the upper end shell flange at 30 ° of angles of inclination is connected with turnover line silicon rubber insulation splicing ear by disc insulator respectively, place the static contact isolation switch system of disc insulator upper end to be connected with conducting rod, place the isolating switch moving contact system of disc insulator lower end to be connected with insulation rotating shaft on being contained in the air seal housing, the insulation rotating shaft other end is connected with isolating/grounding switch mechanism control box; The earthed switch fixed contact is connected with the housing of air seal by sealing flange.
8. according to claim 1 or 7 described special gas insulation combined appliance for electric railroad, it is characterized in that: bushing current transformer is sleeved on the turnover line silicon rubber insulation splicing ear and with shell flange fixedlys connected.
9. according to claim 1 or 6 described special gas insulation combined appliance for electric railroad, it is characterized in that: the breaker mechanism control box is arranged at the right side of circuit breaker.
10. according to claim 1 or 7 described special gas insulation combined appliance for electric railroad, it is characterized in that: isolating/grounding switch mechanism control box is arranged at the housing both sides of air seal respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710066090A CN101145677B (en) | 2007-08-06 | 2007-08-06 | Special gas insulation combined appliance for electric railroad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710066090A CN101145677B (en) | 2007-08-06 | 2007-08-06 | Special gas insulation combined appliance for electric railroad |
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| CN101145677A true CN101145677A (en) | 2008-03-19 |
| CN101145677B CN101145677B (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710066090A Active CN101145677B (en) | 2007-08-06 | 2007-08-06 | Special gas insulation combined appliance for electric railroad |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102299493A (en) * | 2011-09-08 | 2011-12-28 | 云南云开电气股份有限公司 | Double circuit breaker electrified railway 27.5kV gas insulated switchgear (GIS) |
| CN102682935A (en) * | 2011-02-25 | 2012-09-19 | 洛克威尔自动控制技术股份有限公司 | Insulating support flange for current loop system |
| CN102881508A (en) * | 2012-09-07 | 2013-01-16 | 北海银河开关设备有限公司 | Solid insulating pole |
| CN103107043A (en) * | 2011-11-11 | 2013-05-15 | 厦门华电开关有限公司 | High pressure outdoor isolating switch |
| CN105355405A (en) * | 2015-12-03 | 2016-02-24 | 正泰电气股份有限公司 | External current transformer |
| WO2016034088A1 (en) * | 2014-09-02 | 2016-03-10 | 江苏精科智能电气股份有限公司 | Composite combined electric appliance |
| WO2016071684A1 (en) * | 2014-11-04 | 2016-05-12 | Hawker Siddeley Switchgear Limited | Dc circuit breaker and disconnector |
| CN111244926A (en) * | 2020-01-15 | 2020-06-05 | 许继集团有限公司 | Controllable lightning arrester capable of being used for mixed direct current transmission |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002051414A (en) * | 2000-08-02 | 2002-02-15 | Toshiba Corp | Composite gas-insulated switchgear |
| CN101001005A (en) * | 2007-01-05 | 2007-07-18 | 西安电力机械制造公司 | Gas insulation switch device |
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2007
- 2007-08-06 CN CN200710066090A patent/CN101145677B/en active Active
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682935A (en) * | 2011-02-25 | 2012-09-19 | 洛克威尔自动控制技术股份有限公司 | Insulating support flange for current loop system |
| CN102682935B (en) * | 2011-02-25 | 2015-07-22 | 洛克威尔自动控制技术股份有限公司 | Insulating support flange for current loop system |
| CN102299493A (en) * | 2011-09-08 | 2011-12-28 | 云南云开电气股份有限公司 | Double circuit breaker electrified railway 27.5kV gas insulated switchgear (GIS) |
| CN102299493B (en) * | 2011-09-08 | 2015-01-14 | 云南云开电气股份有限公司 | Double circuit breaker electrified railway 27.5kV gas insulated switchgear (GIS) |
| CN103107043A (en) * | 2011-11-11 | 2013-05-15 | 厦门华电开关有限公司 | High pressure outdoor isolating switch |
| CN103107043B (en) * | 2011-11-11 | 2016-10-26 | 厦门华电开关有限公司 | High voltage out-door disconnector |
| CN102881508A (en) * | 2012-09-07 | 2013-01-16 | 北海银河开关设备有限公司 | Solid insulating pole |
| CN102881508B (en) * | 2012-09-07 | 2015-10-07 | 北海银河开关设备有限公司 | Solid insulation pole |
| WO2016034088A1 (en) * | 2014-09-02 | 2016-03-10 | 江苏精科智能电气股份有限公司 | Composite combined electric appliance |
| WO2016071684A1 (en) * | 2014-11-04 | 2016-05-12 | Hawker Siddeley Switchgear Limited | Dc circuit breaker and disconnector |
| CN107148709A (en) * | 2014-11-04 | 2017-09-08 | 霍克西德利开关有限公司 | DC circuit breakers and disconnected device |
| TWI617106B (en) * | 2014-11-04 | 2018-03-01 | 賀肯西德利開關股份有限公司 | Apparatus with circuit breaker and disconnector switch and method of configuring a power delivery system |
| CN107148709B (en) * | 2014-11-04 | 2019-02-22 | 霍克西德利开关有限公司 | DC circuit breakers and disconnected device |
| US10471849B2 (en) | 2014-11-04 | 2019-11-12 | Hawker Siddeley Switchgear Limited | DC circuit breaker and disconnector |
| CN105355405A (en) * | 2015-12-03 | 2016-02-24 | 正泰电气股份有限公司 | External current transformer |
| CN111244926A (en) * | 2020-01-15 | 2020-06-05 | 许继集团有限公司 | Controllable lightning arrester capable of being used for mixed direct current transmission |
| CN111244926B (en) * | 2020-01-15 | 2021-12-24 | 许继集团有限公司 | Controllable lightning arrester capable of being used for mixed direct current transmission |
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| CN101145677B (en) | 2010-05-19 |
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Owner name: YUNNAN YUNKAI ELECTRIC GROUP CO., LTD. Free format text: FORMER OWNER: YUNNAN SWITCH PLANT Effective date: 20100910 |
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Free format text: CORRECT: ADDRESS; FROM: 675000 ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE, CHUXIONG CITY, YUNNAN PROVINCE TO: 675000 YUNKAI ROAD, CHUXIONG ECONOMIC DEVELOPMENT ZONE, CHUXIONG CITY, CHUXIONG YI AUTONOMOUS PREFECTURE, YUNNAN PROVINCE |
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Effective date of registration: 20100910 Address after: 675000 Yunnan Yi Autonomous Prefecture of Chuxiong province Chuxiong Chuxiong Economic Development Zone Open Cloud Patentee after: Yunnan Yunkai Electric Co., Ltd. Address before: 675000 Chuxiong economic and Technological Development Zone, Yunnan Patentee before: Yunnan Switch Plant |