CN100370564C - Single-break-port breaker of 550 KV voltage grade - Google Patents
Single-break-port breaker of 550 KV voltage grade Download PDFInfo
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- CN100370564C CN100370564C CNB2005100428299A CN200510042829A CN100370564C CN 100370564 C CN100370564 C CN 100370564C CN B2005100428299 A CNB2005100428299 A CN B2005100428299A CN 200510042829 A CN200510042829 A CN 200510042829A CN 100370564 C CN100370564 C CN 100370564C
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Abstract
The present invention is used for controlling and protecting a power system with 550kV voltage grade, more specifically, an outdoor floor tank type single-break-port circuit breaker of 550KV voltage grade. With respect to the eccentric design of an insulating pull rod component, a supporting insulating barrel (7) is connected with a transmission mechanism frame (5); an eccentric crank arm (11) is arranged in the transmission mechanism frame (5); one head of an insulating pull rod (8) is connected with the eccentric crank arm (11), and the other head of the insulating pull rod (8) is connected with an operation mechanism (31). SF6 gas with the same pressure is filled in the inner parts of a tank (14) of the breaker and an electromagnetic sleeve pipe (15). The single-break-port circuit breaker of 550KV voltage grade has the advantages of simple structure, convenient installation and maintenance, small occupation area and high reliability of product operation.
Description
Affiliated technical field
The present invention is used for the control and the protection of 550kV electric pressure electric power system, more specifically to be that outdoor type lands pot type 550kV electric pressure single break circuit breaker.
Background technology
Primary cut-out plays control and protective effect in electric power system.High-voltage sf6 circuit breaker just has been used for power transmission and transformation system from the sixties, because it has advantages such as volume is little, reliability is high, maintenance cycle is long, especially its good insulation of in supertension line, showing, cut-off characteristic, so the switchgear in 70～500kV ehv power transmission system now generally all adopts the SF6 circuit breaker.Along with the raising of power transmission and transformation line electric pressure, the developmental research of SF6 circuit breaker has also been proposed more and more higher requirement, as improving the connecting-disconnecting function of single break, increase the product reliability of operation, reduce manufacturing cost etc.In electric power system two kinds of overvoltage that threaten system safety operation are arranged: a kind of is the lightning impulse overvoltage, and this voltage is determining the basic insulation level (BIL) of primary cut-out insulating Design; Another kind is the switching overvoltage that breaker operator causes, switching overvoltage is a serious problem, because circuit breaker itself should protect power system device not to be subjected to the influence of fault, but its action causes the overvoltage that threatens power system insulation again.The trend of modern primary cut-out development is high voltage, big capacity and miniaturization.In China, the research and development of 550kV electric pressure SF6 primary cut-out and manufacturing technology have experienced from the generally evolution of 2 fractures of use till now of 4 fractures, develop 550kV electric pressure single break SF6 primary cut-out in the mid-90 in 20th century abroad.Along with the minimizing of circuit breaker fracture quantity, the product overall structure is simplified, and amount of parts can become the minimizing of multiple, the operational reliability and the technical-economic index of product are greatly improved, but it still exists volume big, and floor space is big, baroque problem.
Summary of the invention
The purpose of this invention is to provide a kind of 550kV electric pressure single break circuit breaker, it is simple in structure, and is convenient for installation and maintenance, and floor space is little, product reliability of operation height.
Technical scheme of the present invention is a kind of 550kV electric pressure single break circuit breaker of design, it is by arc control device unit 13, operating mechanism 31, bushing insulator 15, support insulating cylinder 2,7, tank body 14 constitutes, it is characterized in that: its arc quenching chamber structure is the single break integral structure, be that arc control device unit 13 is arc control device unit 13 that fixed contact system 1 and moving contact system 3 form single break, fixed contact system 1 is by quiet arc contact 26, quiet main contact 25 and aiutage 29 connect and compose, moving contact system 3 is by spout 12, moving arcing contact 27, moving main contact 28 and air cylinder 30 connect and compose, and 3 of fixed contact system 1 and moving contact systems pass through to support insulating cylinder 2 to link the formation integral structures; Insulated tension pole parts in the arc control device have adopted eccentric design on integral arrangement.
The design of the off-centre of described insulated tension pole parts is to support to be connected with driver framework 5 on the insulating cylinder 7, an eccentric connecting lever 11 is arranged in the driver framework 5, and 8 one of insulated tension poles are connected with eccentric connecting lever 11, and the other end is connected with operating mechanism 31.
Described circuit breaker tank body 14 and bushing insulator 15 inside are filled with the SF6 gas of uniform pressure.
Two maintenance hand holes 18 are arranged on the described tank body 14, be used for bushing insulator 15 conveniently being installed and arc control device unit 13 being checked.
One end of described tank body 14 has a hand-hole 19, is used for the assembling of arc control device unit 13 and changes moving arcing contact 27, quiet arc contact 26, spout 12 parts; Hand-hole 19 has an adsorbent assembling cover 20 by cover plate 21 sealings on the cover plate 21, be used to absorb the moisture of 13 inside, arc control device unit, and the inside of arc control device unit 13 is kept dry.
Be parallel with capacitor 4 between the fracture that described fixed contact system 1 and moving contact system 3 constitute, the value of capacitor 4 is between 1800pF-2200pF, support that insulating cylinder 2 is supported on above the driver framework 5, driver framework 5 is fixed on to be supported on the insulating cylinder 7, moving contact system 3 is connected with insulated tension pole 8 by driver framework 5, insulated tension pole 8 is connected with action bars 9, and whole arc control device unit 13 is in metal can 14, and operating mechanism 31 places an end of tank body 14.
Described two bushing insulators 15 are fixed on tank body 14 two ends, and bushing insulator 15 conductor inside 16 are connected with the Mume flower contact 17 at 13 two ends, arc control device unit respectively, and tank body 14 is drawn in the galvanic circle.
The spout larynx footpath size of described arc control device is φ 38mm-φ 41mm, and the spout throat length is 40mm-44mm.
The spout material of described arc control device is the polytetrafluoroethylene that contain micro-boron nitride, and wherein the polytetrafluoroethylene ratio of micro-boron nitride is in the 5%-7% scope.
The invention has the beneficial effects as follows, because it is the single break structure that the present invention designs the arc control device of 550kV circuit breaker, the operating mechanism of circuit breaker places an end of tank body, insulated tension pole parts in the arc control device have adopted eccentric design on integral arrangement, the arc control device parts reduce about half than double break mouth circuit breaker, have simplified arc quenching chamber structure greatly, reduced amount of parts, its floor space is little, has improved product reliability, has also reduced production cost simultaneously.It improves arc control device key dimensions such as nozzle configuration, electrode shape, strokes, and opening velocity has also had raising by a relatively large margin, and insulation and connecting-disconnecting function all are greatly improved.
The invention will be further described below in conjunction with the embodiment accompanying drawing.
Description of drawings
Fig. 1 is the structural representation of embodiment.
Fig. 2 is the structural representation of embodiment arc control device.
Fig. 3 is the single break arc control device cutaway view of Fig. 2.
Fig. 4 is embodiment stroke-time plot.
Among the figure: 1, fixed contact system; 2, support insulating cylinder; 3, moving contact system; 4, capacitor; 5, driver framework; 6, transmission mechanism; 7, support insulating cylinder; 8, insulated tension pole; 9, action bars; 10, moving side flange; 11, connecting lever; 12, spout; 13, arc control device unit; 14, tank body; 15, bushing insulator; 16, conductor; 17, Mume flower contact; 18, maintenance hand hole; 19, hand-hole; 20, adsorbent assembling; 21, cover plate; 22, middle contact; 23, radome; 24, quiet side shielding; 25, quiet main contact; 26, quiet arc contact; 27, moving arcing contact; 28, moving main contact; 29, aiutage; 30, air cylinder; 31, operating mechanism.
Embodiment
As shown in Figure 1, whenever among the figure form by tank body 14 and the arc control device unit 13 that are closed in the tank body 14 by supporting insulating cylinder 7 to be supported in tank body 14 1 ends.Two bushing insulators 15 are installed in tank body 14 two ends, and bushing insulator 15 conductor inside 16 are connected with the Mume flower contact 17 at 13 two ends, arc control device unit respectively, and tank body 14 is drawn in the galvanic circle.Every phase circuit breaker tank body 14 and bushing insulator 15 inside are filled with the SF6 gas of uniform pressure.On tank body 14, also be provided with two maintenance hand holes 18, be used for installing easily bushing insulator 15 and arc control device unit 13 is checked.End at tank body 14 also is provided with a hand-hole 19, is used for the assembling of arc control device unit 13 and changes moving arcing contact 27, quiet arc contact 26, spout 12 parts.Cover plate 21 of these hand-hole 19 usefulness seals, and also has an adsorbent assembling cover 20 on cover plate 21, is used to absorb the moisture of 13 inside, arc control device unit, and the inside of arc control device unit 13 is kept dry.
Among Fig. 2, its arc quenching chamber structure is the single break integral structure, be that arc control device unit 13 is arc control device unit that fixed contact system 1 and moving contact system 3 form single break, 3 of fixed contact system 1 and moving contact systems pass through to support insulating cylinder 2 to link the formation integral structures; The design of the off-centre of insulated tension pole parts is to support to be connected with driver framework 5 on the insulating cylinder 7, an eccentric connecting lever 11 is arranged in the driver framework 5, and 8 one of insulated tension poles are connected with eccentric connecting lever 11, and the other end is connected with operating mechanism 31.Arc control device unit 13 is assemblied in and has in the metal shell of supporting insulating cylinder 2.The fixed contact system 1 of arc control device unit 13 is by supporting that insulating cylinder 2 is supported on the driver framework 5, and the moving contact system 3 of arc control device unit 13 is fixed on the driver framework 5.Driver framework 5 supports tube 7 to be fixed on the moving side flange 10 by insulation, and transmission mechanism 6 links to each other with action bars 9 through insulation pull bar 8, and by the moving contact system 3 that the unit is cut-off in action bars 9 actuatings, realizes the arc control device integral structure.
Fig. 3 is single break arc control device cutaway views, and as Fig. 3 and shown in Figure 2, moving contact system 3 is connected and composed by spout 12, moving arcing contact 27, moving main contact 28 and air cylinder 30, and fixed contact system 1 is connected and composed by quiet arc contact 26, quiet main contact 25 and aiutage 29.Installed quiet side shielding 24 in the periphery of quiet main contact 25, quiet side shielding 24 is fixed on the quiet main contact 25, plays balanced quiet main contact 25 external electrical field.Complete fracture like this is enclosed in to be supported in the insulating cylinder 2, in interrupting process, flow to aiutage 29 in the fixed contact system 1 from the high-temperature gas overwhelming majority of spout 12 ejections after, can effectively be cooled off and be shunted, improved the insulation property between fracture.Capacitor 4 is connected in parallel between the fracture of fixed contact system 1 and moving contact system 3 formations.Radome 23 has also been installed in periphery at capacitor 4, and radome 23 is fixed in the fixed contact system 1, plays balanced fixed contact system 1 external electrical field.The transmission mechanism 6 of driver framework 5 inside is connected with the moving contact system 3 of cut-offfing the unit.The design that the present invention has adopted the insulated tension pole 8 of unique biasing setting to be connected with driver framework 5, dielectric voltage withstand level between a fracture has been improved one times nearly, adopt this design can strengthen arc control device and open distance, overcome the defective that original double break mouth insulating bar is brought along tank body axis arranged mode.Insulated tension pole parts in the arc control device of this 550kV single break circuit breaker have adopted eccentric design on integral arrangement, support to have increased on the tube 7 the connection design of driver framework 5 in insulation, an eccentric connecting lever 11 is set in driver framework 5,8 one of insulated tension poles are connected with eccentric connecting lever 11, and the other end is connected with action bars 9.Specially designed eccentric connecting lever 11 can be put the movement travel of insulated tension pole 8 and be twice, i.e. the movement travel of moving contact kinematic system is 2 times of movement travel of insulated tension pole 8.Such design makes it both satisfy movement travel necessary between fracture, needn't strengthen insulated tension pole 8 movement travels again, thereby greatly reduce the requirement to the excessive operating function of operating mechanism.Also correspondingly having dwindled simultaneously the physical dimension that insulation supports that tube 7 is axial, having simplified arc quenching chamber structure.
Arc control device among the embodiment are that single pressure type becomes blow-out apart from two spout structures, fill the SF6 gas of 0.6MPa in the time of 20 ℃.It is made up of fixed contact system 1 and moving contact system 3, air cylinder 30 and other parts.Spout 12 in the moving contact system 3 is connected with air cylinder 30, moving arcing contact 27 is contained in the spout 12, and moving main contact 28 directly is connected with air cylinder 30.Quiet arc contact 26 in the fixed contact system 1 is contained in the quiet main contact 25.
Circuit breaker is when closing position, and electric current flows out opposite side sleeve pipe 15 inner wires 16 from a side sleeve pipe 15 inner wires 16 through aiutage 29 → quiet main contact 25 → moving main contact 28 → air cylinder 30 → middle fingertip 22 and driver framework 5.
Circuit breaker is when the separating brake position, and insulated tension pole 8 drives air cylinder 30, moving main contact 28, moving arcing contact 27 and spout 12 motions, and after moving main contact 28 and quiet main contact 25 separated, moving arcing contact 27 separated with quiet arc contact 26, produces electric arc therebetween.Meanwhile the SF6 gas pressure in the plenum chamber is set up, and powerful air-flow is gone out the spout extinguish arcs.
The wearing and tearing of quiet arc contact end when the electric field strength of quiet arc contact end and the reduction short-circuit of terminals cut-off when cut-offfing in order to reduce little capacitance current as far as possible, the increasing diameter of quiet arc contact is added to φ 30mm-φ 33mm, and the curvature of quiet arc contact end is improved as R12mm-R14mm.By electric Field Calculation, determined that multi-section circular arc R14mm-R16mm is cut to the optimum shape of quiet arc contact mutually.Improve arc control device and carried out the little capacitance current performance when cut-offfing.This point has also obtained confirmation when carrying out type approval test.
Under normal operating condition, circuit breaker is in closing position, and electric current flows through closed contact usually, and its contact separates when circuit breaker obtains sub-gate signal.Contact separates generation electric arc.Electric arc by around be that the metallic vapour of ionized gas is formed.In most cases, electric arc forms in narrow and limited space, and electric arc just can be cooled off rapidly by the gas that flows like this.
For impelling hot gas from effectively discharging between fracture, the shape of catchment aiutage 29 has been carried out special design, promptly by sufficient electric Field Calculation, draw a R5mm--R50mm continually varying curve, constituted the shape of present aiutage 29.It is little that the profile of present aiutage 29 has outer surface electric field strength, discharges the unobstructed characteristics of hot gas, and the hot gas density that has reduced by the electric arc generation descends to the adverse effect of dielectric strength, and improved the cooling capacity to electric arc.
For increasing air-blowing flow velocity to electric arc, raising is to the cooling capacity of electric arc and promote hot gas from effectively discharging between fracture, resolve cut-offfing phenomenon with the electric arc model, when having determined that diameter when air cylinder 30 is in φ 167mm-φ 175mm scope, under the prerequisite of same nozzle configuration and operating physical force, it is maximum to make that plenum chamber pressure rises, the highest to the air-blowing speed of electric arc, has improved the short circuit interruption performance.
For improving the condition of cut-offfing of circuit breaker close-in fault, the capacitor 4 of 2000pF in parallel between the arc control device fracture, it is installed in the periphery of supporting insulating cylinder 2.The existence of this capacitor 4, the sizable zigzag recovery voltage of the steepness waveform that one side must be born the arc control device of single break circuit breaker becomes gently in the early stage, makes also that on the other hand the Electric Field Distribution between fracture becomes even more.
The core of SF6 circuit breaker is arc control device, finishes extinguishing of the electric arc that produces when splitting broken height voltage, big electric current in its inside by arc-extinguishing medium SF6 gas.Improve the shape of spout, the increase of opening distance between arc control device fracture at the single break circuit breaker, the spout length that correspondingly extended simultaneously for improving near the gas density of arcing contact, has been studied the influence of different larynxs footpath size to gas density.Having drawn rational spout larynx footpath size should be in φ 38mm～φ 41mm scope.Simultaneously ablation resistance, proof voltage and the processing technology of spout material have been carried out sufficient research, the result shows, the different proportionings and the processing technology of spout material have a significant impact ablation resistance, proof voltage, suitable spout material not only can improve ablation resistance, the proof voltage of spout, and can suitably reduce the electric field strength of moving arcing contact and quiet arc contact end.The spout material that the present invention uses is the polytetrafluoroethylene that has added micro-boron nitride.This material has superior arc ablation resistance performance and high voltage withstanding breakdown performance, and by test of many times, the ratio that confirms micro-boron nitride is in the 5%-7% scope time, and it is optimum that its arc ablation resistance performance and high voltage withstanding breakdown performance reach.Like this, compare with 550kV double break mouth arc-extinguishing chamber of circuit breaker, the arc control device gas density of single break circuit breaker is improved, and has also suitably reduced the electric field strength of moving arcing contact and quiet arc contact end, has improved break performance.
Optimized the characteristic curve speed-time curve, arc control device carry out that capacitive is cut-off and load when cut-offfing, and the insulation recovery characteristic changes with interrupting process between its fracture, depend primarily on electric field strength and SF6 gas density near the arcing contact.Thereby to improve the insulation recovery characteristic, and should manage to improve the arc control device opening velocity, improve the quiet arc contact shape, to reduce the electric field strength of moving arcing contact and quiet arc contact surface.Yet when opening velocity was too fast, the situation for short-circuit of terminals T100a etc. cut-offs possibly can't satisfy the requirement to the arcing interval.Consider simultaneously energy that electric arc produces almost with the proportional increase of contact movement velocity (that is stroke), therefore must be within the specific limits the increase of opening velocity restriction, this also is the effective means that suppresses arc energy.
Fig. 4 is embodiment fracture stroke-time plot, worked out preliminary displacement-time curve according to cut-offfing capacity current recovery voltage curve, based on this, by the strictest arcing time is that 0ms is as breaking point, with the 1ms time interval be step-length, calculate that the SF6 gas density distributes between the Electric Field Distribution of inscribing the recovery voltage correspondence between fracture when interrupting process is different and moving arcing contact and quiet arc contact, stroke-time graph has been carried out optimal design, drawn and not only satisfied capacitive and cut-off but also satisfy big capacity and cut-off required characteristic curve.From Fig. 4 stroke-time plot as can be seen, the single break circuit breaker still has certain speed at stroke during near 300mm, has guaranteed that circuit breaker still has to cut-off big current capacity when longer arcing time.
By the suitable spout material of above selection, improve near the gas density of moving arcing contact and quiet arc contact, and measures such as reduction moving arcing contact and quiet arc contact end electric field strength, make at speed of cut-offfing and 363kV, 50kA single break SF6 circuit breaker is compared and is only improved under about 30% the situation, has realized that the arc control device that satisfy 550kV single break circuit breaker cut-off the necessary operating function of big capacity short circuit current.
Other parts of some of the arc control device of single break circuit breaker of the present invention are to design by commercially available and standard GB 722 and GB1208 as parts such as porcelain bushing, current transformer, operating mechanism and general part.
Claims (8)
1.550kV electric pressure single break circuit breaker, it is by arc control device unit (13), operating mechanism (31), bushing insulator (15), support insulating cylinder (2,7), tank body (14) constitutes, it is characterized in that: its arc quenching chamber structure is the single break integral structure, be that arc control device unit (13) is the arc control device unit (13) that fixed contact system (1) and moving contact system (3) form single break, fixed contact system (1) is by quiet arc contact (26), quiet main contact (25) and aiutage (29) connect and compose, moving contact system (3) is by spout (12), moving arcing contact (27), moving main contact (28) and air cylinder (30) connect and compose, and fixed contact system (1) and moving contact system (3) then constitute integral structure by supporting insulating cylinder (2) to link; Insulated tension pole parts in the arc control device have adopted eccentric design on integral arrangement; The off-centre design of described insulated tension pole parts, be to support to be connected with driver framework (5) on the insulating cylinder (7), an eccentric connecting lever (11) is arranged in the driver framework (5), and (8) one of insulated tension poles are connected with eccentric connecting lever (11), and the other end is connected with operating mechanism (31).
2. 550kV electric pressure single break circuit breaker according to claim 1 is characterized in that: described circuit breaker tank body (14) and bushing insulator (15) inside are filled with the SF6 gas of uniform pressure.
3. 550kV electric pressure single break circuit breaker according to claim 1 is characterized in that: two maintenance hand holes (18) are arranged on the described tank body (14), be used for bushing insulator (15) conveniently being installed and arc control device unit (13) being checked.
4. 550kV electric pressure single break circuit breaker according to claim 1, it is characterized in that: an end of described tank body (14) has a hand-hole (19), is used for the assembling of arc control device unit (13) and changes moving arcing contact (27), quiet arc contact (26), spout (12) parts; Hand-hole (19) has an adsorbent assembling cover (20) by cover plate (21) sealing on the cover plate (21), be used to absorb the inner moisture in arc control device unit (13), and the inside of arc control device unit (13) is kept dry.
5. 550kV electric pressure single break circuit breaker according to claim 1, it is characterized in that: be parallel with capacitor (4) between the fracture that described fixed contact system (1) and moving contact system (3) constitute, the value of capacitor (4) is between 1800pF-2200pF, support insulating cylinder (2) to be supported on above the driver framework (5), driver framework (5) is fixed on to be supported on the insulating cylinder (7), moving contact system (3) is connected with insulated tension pole (8) by driver framework (5), insulated tension pole (8) is connected with action bars (9), whole arc control device unit (13) is in metal can (14), and operating mechanism (31) places an end of tank body (14).
6. 550kV electric pressure single break circuit breaker according to claim 1, it is characterized in that: described two bushing insulators (15) are fixed on tank body (14) two ends, bushing insulator (15) conductor inside (16) is connected with the Mume flower contact (17) at two ends, arc control device unit (13) respectively, and tank body (14) is drawn in the galvanic circle.
7. 550kV electric pressure single break circuit breaker according to claim 1 is characterized in that: the quiet arc contact diameter of described arc control device is φ 30mm-33mm.
8. 550kV electric pressure single break circuit breaker according to claim 1 is characterized in that: the spout larynx footpath size of described arc control device is 38mm-φ 41mm, and the spout throat length is 40mm-44mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428299A CN100370564C (en) | 2005-06-16 | 2005-06-16 | Single-break-port breaker of 550 KV voltage grade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428299A CN100370564C (en) | 2005-06-16 | 2005-06-16 | Single-break-port breaker of 550 KV voltage grade |
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| CN1710685A CN1710685A (en) | 2005-12-21 |
| CN100370564C true CN100370564C (en) | 2008-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100428299A Active CN100370564C (en) | 2005-06-16 | 2005-06-16 | Single-break-port breaker of 550 KV voltage grade |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362536B (en) * | 2014-10-31 | 2017-01-11 | 平高集团有限公司 | Closed switching device, and arc extinguish chamber and tank of closed switching device |
| CN113410087B (en) * | 2021-06-17 | 2023-06-20 | 西安西电开关电气有限公司 | Compact high-voltage tank type quick mechanical combined switch equipment |
| CN113745042A (en) * | 2021-09-07 | 2021-12-03 | 南京南瑞继保电气有限公司 | Multi-fracture tank type high-voltage quick circuit breaker |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5422450A (en) * | 1993-01-20 | 1995-06-06 | Kabushiki Kaisha Toshiba | Vacuum circuit breaker actuating assembly |
| CN2798291Y (en) * | 2005-06-16 | 2006-07-19 | 西安西开高压电气股份有限公司 | 550 KV voltage grade optimized breaker |
-
2005
- 2005-06-16 CN CNB2005100428299A patent/CN100370564C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5422450A (en) * | 1993-01-20 | 1995-06-06 | Kabushiki Kaisha Toshiba | Vacuum circuit breaker actuating assembly |
| CN2798291Y (en) * | 2005-06-16 | 2006-07-19 | 西安西开高压电气股份有限公司 | 550 KV voltage grade optimized breaker |
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Owner name: XI AN XD SWITCHHGEAR ELECTRIC CO.,LTD. Free format text: FORMER NAME: XI AN XIKAI HIGH-VOLTAGE ELECTRIC CO., LTD. |
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Address after: 710077 No. 509, Daqing Road, Xi'an, Shaanxi Patentee after: Xi'an XD Switchgear Electic Co., Ltd. Address before: 710077 Shaanxi Xi'an Daqing Road No. 509 West opened joint stock company technology department Patentee before: Xi'an Xikai High-Voltage Electric Co., Ltd. |