CN102780189A - Bus fixing device with specially-shaped fixing piece for high-voltage switch equipment - Google Patents
Bus fixing device with specially-shaped fixing piece for high-voltage switch equipment Download PDFInfo
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- CN102780189A CN102780189A CN2012102895445A CN201210289544A CN102780189A CN 102780189 A CN102780189 A CN 102780189A CN 2012102895445 A CN2012102895445 A CN 2012102895445A CN 201210289544 A CN201210289544 A CN 201210289544A CN 102780189 A CN102780189 A CN 102780189A
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Abstract
The invention relates to a bus fixing device with a specially-shaped fixing piece for high-voltage switch equipment. The bus fixing device is characterized by comprising two insulators and the specially-shaped fixing piece, wherein a fixed supporting piece is connected with the tops of the insulators, the specially-shaped fixing piece is connected with the bottoms of the insulators, and the specially-shaped fixing piece is connected with a rectangular bus; and the specially-shaped fixing piece is one of an E-shaped fixing piece, a T-shaped fixing piece and a U-shaped fixing piece. Compared with the prior art, the bus fixing device disclosed by the invention has the following advantages: 1, the bus fixing device is novel in principle, reasonable in structure, safe and reliable, and suitable for batch production; 2, the bus fixing device is convenient in use, simple in operation, and high in structural strength, so that the switch equipment is better in performance and the personal safety of operation personnel and the reliable running of the equipment are ensured; and 3, the special requirements of parallel-length installation, hoisting and the like for the rectangular bus bar and the insulators during a manufacturing process for the high-voltage switch equipment are met.
Description
Technical field
The present invention relates to a kind of bus fixture that has special-shaped fixture of high voltage switchgear; Be used for high voltage switchgear installation of rectangular bus bar in the primary circuit, fixing in production, manufacture process cabinet, belong to installation, the technique for fixing field of rectangular bus bar.
Background technology
In power transmission and transformation system, high voltage switchgear is extremely important part, in electric power system, is realizing the conveying and the distribution of electric energy.In the production of high voltage switchgear, manufacture process, rectangular bus bar is the conductive carrier of the most frequently used primary circuit, is connected on request, assembles with other major component (like circuit breaker, electric current mutual inductance etc.), forms the primary circuit of high voltage switchgear.
High voltage switchgear is under normal operation, and the operating current that passes through is less, and is less by the electric power that electric current produces, little to the influence of rectangular bus bar; Like high voltage switchgear under the situation of accident condition (like failed because); Fault current generally can rise to tens thousand of amperes or bigger; Reach sometimes more than the 200kA, the electric power that produces between the bus is quite big, and is not enough like the constant intensity of bus; Be easy to its supporter is destroyed, cause bigger secondary accident; In addition, the fixed form of rectangular bus bar is according to the manufacturing requirement of reality, realize wide ability and the parallel installation of the short transverse of its fixture insulator of bus.
Though the high voltage switchgear manufacturing technology has obtained fast development; The fixed form of rectangular bus bar is generally: the bottom of insulator is fixed with securing member and supporter; Wide of rectangular bus bar fix with securing member with insulator is perpendicular at the top, wide the length direction with insulator of rectangular bus bar is difficult to the installation that realizes paralleling.Along with the development of high-voltage switch gear industry, need parallel installation under many circumstances, generally adopt bus to carry out the transition assembling, its intensity is relatively poor, can not satisfy the performance requirement of equipment, and complex manufacturing technology, cost is higher, mounting means is unreliable; As when adopting the lifting mode to install, because of receiving the influence of bus row gravity, its installation strength is weak more.
In addition; High voltage switchgear cut-offs the short circuit current direction to big electric current, height to be developed; The installation quantity of rectangular bus bar commonly used generally can only be installed 4 rectangular bus bars at most, for the fixed form of 6 buses of needs; Requirement to the intensity of installing and reliability is higher, can not satisfy the manufacturing of high voltage switchgear.For this reason, make that a kind of wide parallel installation with insulator, intensity of rectangular bus bar is higher, reliable installation, cost lowlyer, convenient are made, the fixture of 6 buses of multipotency assembling is very necessary.
Summary of the invention
Wide parallel installation with insulator, the intensity that the purpose of this invention is to provide a kind of rectangular bus bar is higher, reliable installation, cost lowlyer, convenient are made, 6 buses of multipotency assembling the bus fixture of high voltage switchgear.
In order to achieve the above object, technical scheme of the present invention has provided a kind of bus fixture that has special-shaped fixture of high voltage switchgear, it is characterized in that; Comprise 2 insulators and 1 special-shaped fixture; The top of insulator connects the fixing branch gripping member, and the bottom of insulator connects special-shaped fixture, and special-shaped fixture connects square type bus; Wherein, special-shaped fixture is a kind of in E shape fixture, T shape fixture or the U-shaped fixture.
Preferably, the top of described each insulator is connected through 2 M12 outer-hexagonal bolts with the fixing branch gripping member.
Preferably, the bottom of described each insulator is connected through 2 M12 hexagon socket head cap screws with special-shaped fixture.
Preferably, described special-shaped fixture is connected through 2 M12 outer-hexagonal bolts with each square type bus.
Preferably, the top of described each insulator and bottom respectively are provided with 2 M12 embedding nuts, an end of M12 embedding nut and the top of insulator or bottom flush.
Preferably; Described E shape fixture comprises one first lateral part and three first vertical parts; The top of three first vertical parts lays respectively at the two ends and the middle part, bottom surface of first lateral part, and the end face of first lateral part is first stationary plane, and first stationary plane is provided with 4 the one M12 hexagon socket head cap screw installing holes; Two sides of the first vertical part are all the first bus stationary plane, and each first bus stationary plane is provided with 2 first bus installing holes.
Preferably; Described T shape fixture comprises one second lateral part and one second vertical part; The top of the second vertical part is positioned at the middle part of bottom surface, second lateral part, and the end face of second lateral part is second stationary plane, and second stationary plane is provided with 2 the 2nd M12 hexagon socket head cap screw installing holes; Two sides of the second vertical part are the second bus stationary plane, and the second bus stationary plane is provided with 2 second bus installing holes.
Preferably; Described U-shaped fixture comprises one the 3rd lateral part and two the 3rd vertical parts; The top of two the 3rd vertical parts lays respectively at the two ends of the 3rd lateral part, and the end face of the 3rd lateral part is the 3rd stationary plane, and the 3rd stationary plane is provided with 2 the 3rd M12 hexagon socket head cap screw installing holes; Two sides of the 3rd vertical part are all the triple bus-bar stationary plane, and each triple bus-bar stationary plane is provided with 2 triple bus-bar installing holes.
Compared with prior art, advantage of the present invention is:
1, principle is novel, rational in infrastructure, safe and reliable, is suitable for producing in batches;
2, easy to use, simple to operate, structural strength is high, make the performance of switchgear more excellent, operating personnel's the personal safety and the reliability service of equipment when having guaranteed maintenance, operation;
3, satisfied the rectangular bus bar row and specific (special) requirements such as insulator length parallel installation and lifting of high voltage switchgear in manufacture process.
Description of drawings
Fig. 1 is the bus fixture front view that has E shape fixture of the high voltage switchgear among the embodiment 1;
Fig. 2 is the front view of insulator;
Fig. 3 is the vertical view of insulator;
Fig. 4 is that the A-A of insulator is to cutaway view;
Fig. 5 is the front view of the E shape fixture among the embodiment 1;
Fig. 6 is the left view of the E shape fixture among the embodiment 1;
Fig. 7 is the vertical view of the E shape fixture among the embodiment 1;
Fig. 8 is that the B-B of the E shape fixture among the embodiment 1 is to cutaway view;
Fig. 9 is the bus fixture front view that has T shape fixture of the high voltage switchgear among the embodiment 2;
Figure 10 is the front view of the T shape fixture among the embodiment 2;
Figure 11 is the left view of the T shape fixture among the embodiment 2;
Figure 12 is the vertical view of the T shape fixture among the embodiment 2;
Figure 13 is that the B-B of the T shape fixture among the embodiment 2 is to cutaway view;
Figure 14 is the bus fixture front view that has the U-shaped fixture of the high voltage switchgear among the embodiment 3;
Figure 15 is the front view of the U-shaped fixture among the embodiment 3;
Figure 16 is the left view of the U-shaped fixture among the embodiment 3;
Figure 17 is the vertical view of the U-shaped fixture among the embodiment 3;
Figure 18 is that the B-B of the U-shaped fixture among the embodiment 3 is to cutaway view.
Embodiment
For making the present invention more obviously understandable, now with preferred embodiment, and conjunction with figs. elaborates as follows.
Embodiment 1
As shown in Figure 1; Be the bus fixture front view that has E shape fixture of high voltage switchgear, the bus fixture that has E shape fixture of described high voltage switchgear mainly is made up of 3,1 E type fixture of 2 insulators 5-1,6 square type buses 7, M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screws 6.M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6 are standard fasteners, equipped as required bullet pad, plain cushion or nut.The top 12 of insulator 3 connects fixing branch gripping member 2, and insulator 3 bottoms 13 connect E shape fixture 5, and E shape fixture 5 connects square type bus 7.The top 12 of each insulator 3 is connected through 2 M12 outer-hexagonal bolts 1 with fixing branch gripping member 2.The bottom 13 of each insulator 3 is connected through 2 M12 hexagon socket head cap screws 6 with E shape fixture 5.Described E shape fixture 5 is connected through 2 M12 outer-hexagonal bolts 1 with each square type bus 7.
As shown in Figure 2, described insulator 3 is to be pressed to annotate by the plastic material of good insulation preformance to form.As shown in Figure 4, the top 12 and the bottom 13 of each insulator 3 respectively are provided with 2 M12 embedding nuts 4, and be as shown in Figure 3, an end of M12 embedding nut 4 and the top 12 of insulator 3 or bottom 13 flush.On M12 embedded nut 4, be provided with the screw thread of M12, so that be connected with securing member M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6.Pressure at insulator 3 is annotated in the manufacture process, M12 embedded nut 4 is located at the two ends of insulator 3.
As shown in Figure 5, described E shape fixture 5 is steelworks, comprises one first lateral part 14-1 and three first vertical part 15-1; The top of three first vertical part 15-1 lays respectively at two ends and the middle part, bottom surface of the first lateral part 14-1, and as shown in Figure 7, the end face of the first lateral part 14-1 is a stationary plane 9; Stationary plane 9 is provided with 4 the one M12 hexagon socket head cap screw installing hole 10-1; As shown in Figure 8, the longitudinal section of a M12 hexagon socket head cap screw installing hole 10-1 is stairstepping, so that installing M 12 hexagon socket head cap screws 6; And assembling back M12 hexagon socket head cap screw 6 sinks among the E type fixture 5-1 fully, can not have influence on the installation of other parts.As shown in Figure 6, two sides of the first vertical part 15-1 are all the first bus stationary plane 8-1, and each first bus stationary plane 8-1 is provided with 2 first bus installing hole 11-1, is used for installing square type bus 7.
During installation, be assemblied on the fixing branch gripping member 2 with the top 12 of 4 M12 outer-hexagonal bolts 1 (containing supporting bullet pad, plain cushion) earlier through 2 insulators 3; Link together through the bottom 13 of insulator 3 and the stationary plane 9 of E type fixture 5-1 with 4 M12 hexagon socket head cap screws 6 again.On square type bus 7, be provided with installing hole; Use 6 M12 outer-hexagonal bolts 1 (containing supporting bullet pad, plain cushion, nut) that square type bus 7 is fixed on the E type fixture 5-1 at last; The face of type bus 7 and the first bus stationary plane 8-1 on the E type fixture 5-1 are tightly cut, and the length direction of the Width of square type bus 7 and insulator 3 parallels like this.Through assembling process, accomplished the assembling of the bus fixture of whole high voltage switchgear like upper type.It is at most 6 square type bus 7 that this device can be installed as required.
As shown in Figure 9; The bus fixture front view that has T shape fixture for high voltage switchgear; The bus fixture that has T shape fixture of described high voltage switchgear comprises insulator 3 and T shape fixture 5-2; The top 12 of insulator 3 connects fixing branch gripping member 2, and the bottom 13 of insulator 3 connects T shape fixture 5-2, and T shape fixture 5-2 connects 2 square type buses 7.The top 12 of described insulator 3 is connected through 2 M12 outer-hexagonal bolts 1 with fixing branch gripping member 2.The bottom 13 of described insulator 3 is connected through 2 M12 hexagon socket head cap screws 6 with T shape fixture 5-2.Described T shape fixture 5-2 is connected through 2 M12 outer-hexagonal bolts 1 with square type bus 7.M12 outer-hexagonal bolt 1 is standard fasteners with M12 hexagon socket head cap screw 6, during assembling, and supporting as required corresponding bullet pad, plain cushion or nut.
As shown in Figures 2 and 3, described insulator 3 is pressed to annotate by the plastic material of good insulation preformance and is formed, and its top 12 respectively is provided with 2 M12 embedding nuts 4 with bottom 13, and is as shown in Figure 4, an end of M12 embedding nut 4 and the top 12 of insulator 3 or bottom 13 flush.On M12 embedding nut 4, be provided with the screw thread of M12, so that be connected with securing member M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6.
Shown in figure 10, described T shape fixture 5-2 is a steelwork, and it comprises one second lateral part 14-2 and one second vertical part 15-2; The top of vertical part is positioned at the middle part of 14-2 bottom surface, second lateral part, and shown in figure 12, the end face of the second lateral part 14-2 is the second stationary plane 9-2; The second stationary plane 9-2 is provided with 2 M12 hexagon socket head cap screw installing holes 10; Shown in figure 13, the longitudinal section of M12 hexagon socket head cap screw installing hole 10 is a stairstepping, so that installing M 12 hexagon socket head cap screws 6; And assembling back M12 hexagon socket head cap screw 6 sinks among the T shape fixture 5-2 fully, can not have influence on the installation of other parts.Shown in figure 11, two sides of the second vertical part 15-2 are the second bus stationary plane 8-2, and the second bus stationary plane 8-2 is provided with 2 second bus installing hole 11-2, is used for installing square type bus 7.
During installation, be assemblied on the fixing branch gripping member 2 through the top 12 of insulator 3 with 2 M12 outer-hexagonal bolts, 1 supporting bullet pad, plain cushion earlier; Link together through the bottom 13 of insulator 3 and the second stationary plane 9-2 of T shape fixture 5-2 with 2 M12 hexagon socket head cap screws 6 again.On square type bus 7, be provided with installing hole; With 2 M12 outer-hexagonal bolts, 1 supporting bullet pad, plain cushion, nut square type bus 7 is fixed on the T shape fixture 5-2 at last; The face of square type bus 7 and the second bus stationary plane 8-2 on the T shape fixture 5-2 are tightly cut; The length equation of the Width of square type bus 7 and insulator 3 parallels like this, has guaranteed special installation requirement and installation strength.Through assembling process, accomplished the assembling of whole high voltage switchgear bus fixture like upper type.This device can be installed 1 or 2 square type buses 7 as required, is 2 at most.
Shown in figure 14; The bus fixture front view that has the U-shaped fixture for high voltage switchgear; The bus fixture that has the U-shaped fixture of described high voltage switchgear is made up of insulator 3, U-shaped fixture 5-3, square type bus 7, M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6; The top 12 of insulator 3 connects fixing branch gripping member 2, and the bottom 13 of insulator 3 connects U-shaped fixture 5-3, and U-shaped fixture 5-3 connects 4 square type buses 7.The top 12 of insulator 3 is connected through 2 M12 outer-hexagonal bolts 1 with fixing branch gripping member 2.The bottom 13 of described insulator 3 is connected through 2 M12 hexagon socket head cap screws 6 with U-shaped fixture 5-3.Described U-shaped fixture 5-3 is connected through 2 M12 outer-hexagonal bolts 1 with each square type bus 7.M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6 are conventional fasteners, equipped as required bullet pad, plain cushion or nut.
As shown in Figure 2; Described insulator 3 is pressed to annotate by the plastic material of good insulation preformance and is formed, and as shown in Figure 4, the top 12 and the bottom 13 of described insulator 3 respectively are provided with 2 M12 embedding nuts 4; As shown in Figure 3, an end of M12 embedding nut 4 and the top 12 of insulator 3 or bottom 13 flush.On M12 embedded nut 4, be provided with the screw thread of M12, so that be connected with securing member M12 outer-hexagonal bolt 1, M12 hexagon socket head cap screw 6.
Shown in figure 15, described U-shaped fixture 5-3 is a steelwork, comprises one the 3rd lateral part 14-3 and two the 3rd vertical part 15-3; The top of two the 3rd vertical part 15-3 lays respectively at the two ends of lateral part 5, and is shown in figure 17, and the end face of the 3rd lateral part 14-3 is a stationary plane 9; Stationary plane 9 is provided with 2 the 3rd M12 hexagon socket head cap screw installing hole 10-3, and is shown in figure 18, and the longitudinal section of the 3rd M12 hexagon socket head cap screw installing hole 10-3 is a stairstepping; So that installing M 12 hexagon socket head cap screws 6, and M12 hexagon socket head cap screw 6 sinks in the U type fixture 5 fully after the assembling, can not have influence on the installation of other parts; Shown in figure 16; Two sides of the 3rd vertical part 15-3 are all triple bus-bar stationary plane 8-3, and each triple bus-bar stationary plane 8-3 is provided with 2 triple bus-bar installing hole 11-3, are used for installing square type bus 7.
During installation, be assemblied on the fixing branch gripping member 2 with the top 12 of 2 M12 outer-hexagonal bolts 1 (supporting bullet pad, plain cushion) earlier through insulator 3; Link together through the bottom 13 of insulator 3 and the stationary plane 9 of U type fixture 5 with 2 M12 hexagon socket head cap screws 6 again.On square type bus 7, be provided with installing hole; Use 2 M12 outer-hexagonal bolts 1 (supporting bullet pad, plain cushion, nut) that square type bus 7 is fixed on the U type fixture 5 at last; The face of square type bus 7 and the triple bus-bar stationary plane 8-3 on the U type fixture 5 are tightly cut, and the length direction of the Width of square type bus 7 and insulator 3 parallels like this.Through assembling process like upper type, accomplished the assembling of the bus fixture of whole high voltage switchgear, maximum quantity of installable as required square type bus 7 are 4.
Claims (8)
1. the bus fixture that has special-shaped fixture of a high voltage switchgear; It is characterized in that, comprise 2 insulators (3) and 1 special-shaped fixture, the top of insulator (3) connects fixing branch gripping member (2); The bottom of insulator (3) connects special-shaped fixture; The abnormity fixture connects square type bus (7), and wherein, special-shaped fixture is a kind of in E shape fixture (5-1), T shape fixture (5-2) or the U-shaped fixture (5-3).
2. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1 is characterized in that, the top (12) of described each insulator (3) is connected through 2 M12 outer-hexagonal bolts (1) with fixing branch gripping member (2).
3. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1 is characterized in that, the bottom (13) of described each insulator (3) is connected through 2 M12 hexagon socket head cap screws (6) with special-shaped fixture.
4. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1 is characterized in that, described special-shaped fixture is connected through 2 M12 outer-hexagonal bolts (1) with each square type bus (7).
5. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1; It is characterized in that; Top (12) and bottom (13) of described each insulator (3) respectively are provided with 2 M12 embedding nuts (4), the top (12) of an end of M12 embedding nut (4) and insulator (3) or bottom (13) flush.
6. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1; It is characterized in that; Described E shape fixture (5-1) comprises one first lateral part (14-1) and three first vertical parts (15-1); The top of three first vertical parts (15-1) lays respectively at the two ends and the middle part, bottom surface of first lateral part (14-1); The end face of first lateral part (14-1) is first stationary plane (9-1); First stationary plane (9-1) is provided with 4 the one M12 hexagon socket head cap screw installing holes (10-1), and two sides of the first vertical part (15-1) are all the first bus stationary plane (8-1), and each first bus stationary plane (8-1) is provided with 2 first bus installing holes (11-1).
7. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1; It is characterized in that; Described T shape fixture (5-2) comprises one second lateral part (14-2) and one second vertical part (15-2); The top of the second vertical part (15-2) is positioned at the middle part of bottom surface, second lateral part (14-2), and the end face of second lateral part (14-2) is second stationary plane (9-2), and second stationary plane (9-2) is provided with 2 the 2nd M12 hexagon socket head cap screw installing holes (10-2); Two sides of the second vertical part (15-2) are the second bus stationary plane (8-2), and the second bus stationary plane (8-2) is provided with 2 second bus installing holes (11-2).
8. the bus fixture that has special-shaped fixture of high voltage switchgear as claimed in claim 1; It is characterized in that; Described U-shaped fixture (5-3) comprises one the 3rd lateral part (14-3) and two the 3rd vertical parts (15-3); The top of two the 3rd vertical parts (15-3) lays respectively at the two ends of the 3rd lateral part (14-3); The end face of the 3rd lateral part (14-3) is the 3rd stationary plane (9-3); The 3rd stationary plane (9-3) is provided with 2 the 3rd M12 hexagon socket head cap screw installing holes (10-3), and two sides of the 3rd vertical part (15-3) are all triple bus-bar stationary plane (8-3), and each triple bus-bar stationary plane (8-3) is provided with 2 triple bus-bar installing holes (11-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210289544.5A CN102780189B (en) | 2012-08-14 | 2012-08-14 | The bus fixture with special-shaped fixture of high voltage switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210289544.5A CN102780189B (en) | 2012-08-14 | 2012-08-14 | The bus fixture with special-shaped fixture of high voltage switchgear |
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| Publication Number | Publication Date |
|---|---|
| CN102780189A true CN102780189A (en) | 2012-11-14 |
| CN102780189B CN102780189B (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210289544.5A Active CN102780189B (en) | 2012-08-14 | 2012-08-14 | The bus fixture with special-shaped fixture of high voltage switchgear |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2037881U (en) * | 1988-09-23 | 1989-05-17 | 陈景伟 | Bus-clamping plate for low-voltage distributor |
| JP2003199217A (en) * | 2001-12-26 | 2003-07-11 | Yoshihiko Kato | Bus bar support structure |
| CN101409428A (en) * | 2008-12-04 | 2009-04-15 | 天水长城开关厂有限公司 | Apparatus for fixing vertical multi-slice rectangle conductor group |
| CN202126895U (en) * | 2011-06-20 | 2012-01-25 | 陕西科技大学 | Bus insulator |
-
2012
- 2012-08-14 CN CN201210289544.5A patent/CN102780189B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2037881U (en) * | 1988-09-23 | 1989-05-17 | 陈景伟 | Bus-clamping plate for low-voltage distributor |
| JP2003199217A (en) * | 2001-12-26 | 2003-07-11 | Yoshihiko Kato | Bus bar support structure |
| CN101409428A (en) * | 2008-12-04 | 2009-04-15 | 天水长城开关厂有限公司 | Apparatus for fixing vertical multi-slice rectangle conductor group |
| CN202126895U (en) * | 2011-06-20 | 2012-01-25 | 陕西科技大学 | Bus insulator |
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| CN102780189B (en) | 2015-10-28 |
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Effective date of registration: 20220610 Address after: 314004 plant 6, No. 379, Ziyu Road, Daqiao Town, Nanhu District, Jiaxing City, Zhejiang Province Patentee after: Zhejiang Zhengtai Electric Technology Co.,Ltd. Address before: 201614 No. 1255, Wen Jie Road, Shanghai, Songjiang District Patentee before: Chint Electric Co.,Ltd. |