CN104112575B - A kind of on-load voltage regulation capacity transfer shunting switch - Google Patents
A kind of on-load voltage regulation capacity transfer shunting switch Download PDFInfo
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- CN104112575B CN104112575B CN201410321879.XA CN201410321879A CN104112575B CN 104112575 B CN104112575 B CN 104112575B CN 201410321879 A CN201410321879 A CN 201410321879A CN 104112575 B CN104112575 B CN 104112575B
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
A kind of on-load voltage regulation capacity transfer shunting switch, including three set operating mechanisms, three capacitance switchs and two tap changers, operating mechanism respectively has a set of bistable permanent magnetic assembly and poke rod thereof, switch respectively includes an insulating cylinder in sealing vacuum shape, and the diverter surface of movable contact spring and static contact is respectively positioned on the vacuum into the barrel chamber of insulating cylinder；The diverter surface width of three capacitance switch mesohigh side static contact pieces is less than the width of low-pressure side.Due to the fact that the diverter surface of active and static contact is positioned at vacuum into the barrel chamber, therefore have that arc extinction performance is reliable, an advantage that length in service life and transformer oil will not be polluted by electric arc；Furthermore, employing is initially switched off high pressure winding, again cutoff low winding, first connect low pressure winding, after connecting the technology of high pressure winding again, achieve that electric arc is little, be conducive to remanent magnetism in eliminating transformer iron core, shoving and overvoltage when avoiding being again switched on high-pressure side winding, effectively reduces the purpose of handoff procedure voltage pulsation amplitude.
Description
[technical field]
The present invention relates to a kind of pressure regulating and capacitance regulating transformer part, particularly relate to a kind of and pressure regulating and capacitance regulating transformer
Join the on-load voltage regulation capacity transfer shunting switch of use.
[background technology]
Loaded capacity regulating voltage regulating shunting switch is that transformer is adjusted capacity under excitation or non-interrupt load state
With the device of voltage, it is particularly suited for the capacity regulating voltage adjusting distribution transformer that load change is bigger with power network fluctuation,
Realize energy-saving and cost-reducing.It is placed in distribution transformer fuel tank, is immersed in transformer oil, structure include by
The tune that capacity transfer part, some operating mechanisms and the tap changer that some operating mechanisms and capacitance switch are constituted is constituted
Laminate section, two-part operating mechanism structure is identical, and the structure of capacity transfer and tap changer is the most basically identical.Often
Capacitance switch or tap changer each include one by the insulating cylinder of epoxy resin casting, in this insulation
The into the barrel chamber of cylinder is provided with the transmission component and movable contact spring being associated with operating mechanism, and barrel is embedded with static contact.
During operation, operating mechanism instructs according to transformer automatic controller, makes movable contact spring in insulation by transmission component
The into the barrel chamber revolution of cylinder, to complete two switchings: one has been transformer high-voltage winding triangle star, low
The capacity transfer switching of pressure winding series connection mode, two has been the high, medium and low gear of transformer high-voltage winding
Pressure regulation switching, it is achieved capacity and pressure regulating purpose.Problem is: 1, during capacity and pressure regulating, active and static contact because of
The produced electric arc of switching, can pollute arc-extinguishing medium transformer oil, under causing transformer oil insulating properties rapidly
Fall, seriously jeopardizes transformer service life, and potential safety hazard is big.2, during capacity transfer switching, high and low pressure group
All contacts synchronism switching, is affected electric arc by the big function of current of low-pressure side winding big so that dynamic and static contact pole
Easily burn.
[summary of the invention]
For solving the problems referred to above that prior art exists, it is desirable to provide a kind of on-load voltage regulation capacity transfer tap
Switch, the electric arc that the switching of this shunting switch active and static contact produces, will not cause dirt to arc-extinguishing medium transformer oil
Dye, has length in service life, an advantage that reliability is high；Moreover, switching arc is relatively small.
For achieving the above object, present invention employs following technical proposals:
A kind of on-load voltage regulation capacity transfer shunting switch, including the installing plate being arranged in transformer oil box cavity, with
And be placed in the functional unit at this installing plate top and be positioned at the switch block bottom this installing plate；Described operating portion
Part includes capacity transfer operating mechanism, the first pressure regulation operating mechanism and the second pressure regulation operating mechanism, the institute that structure is identical
State the first capacitance switch, the second capacitance switch and the 3rd capacitance switch that switch block includes that structure is substantially uniform,
And first tap changer and the second tap changer；Described capacity transfer operating mechanism, the first pressure regulation operating mechanism or
Second pressure regulation operating mechanism has a set of bistable permanent magnetic assembly and a poke rod thereof, the upper end of described poke rod with
Iron core in bistable permanent magnetic assembly is associated；Described first capacitance switch, the second capacitance switch, the 3rd tune
Hold switch, the first tap changer or the second tap changer, including an insulating cylinder, the into the barrel chamber of this insulating cylinder
Being provided with a set of transmission component and one group of movable contact spring, barrel bottom is embedded with three groups of static contacts；It is characterized in that: described
The barrel chamber of insulating cylinder is in sealing vacuum shape, and the diverter surface of described one group of movable contact spring and three groups of static contacts is respectively positioned on institute
State the vacuum into the barrel chamber of insulating cylinder；The cylinder of described insulating cylinder is by upper shell, lower shell, upper cover plate and lower cover
Plate sealingly connects and forms, and the lower shell that the upper shell that wherein metal material is made and nonmetallic materials make is spirally connected
Integral；Described three groups of static contacts are embedded on described lower shell；A vacuum it is provided with in described upper cover plate
Exhaust tube.
As when being preferably embodied as, described transmission component include drive link, bellows, driver blade, bearing pin,
Drive plate, steady pin and compression spring thereof；Bellows-sheathed is located on the shaft of drive link, its inner port and bar
Body sealingly connects, and external port sealingly connects with the wall of described cylinder；The outer end of described drive link is stirred with described
Bar is connected, and the inner of drive link is hinged with driver blade through bearing pin, and this driver blade is fixed in drive plate
Mandrel upper end；Suitable with three groups of static contacts, three movable contact springs are through steady pin and compression spring radially location thereof
Peripheral at described drive plate.
As when being preferably embodied as, described first capacitance switch, the second capacitance switch and the 3rd capacitance switch
Three groups of static contacts be respectively high-pressure side static contact group, the first low-pressure side static contact group and the second low-pressure side stationary contact
Sheet group；Each group is made up of four static contacts respectively, and they circumferences cast on lower shell, wherein: first
In low-pressure side static contact group and the second low-pressure side static contact group, the sheet body width of all static contacts is consistent, sheet with
Spacing distance between sheet is consistent, and in the static contact group of high-pressure side, the sheet body width of four static contacts is less than two
The sheet body width of the static contact in individual low-pressure side static contact group.
As three groups of static contacts when being preferably embodied as, in described first tap changer or the second tap changer
Being high-pressure side static contact group, each group is made up of four static contacts respectively, and they circumferences cast in lower shell
On, and the sheet body width of all static contacts, and the spacing distance between sheet with sheet is consistent.
Compared with prior art, the present invention has following innovation and advantage
One, after making into the insulating cylinder of three capacitance switchs and two tap changers to seal vacuum structure, make
The diverter surface of contact and static contact is in into the barrel chamber, and changing arc-extinguishing medium transformer oil is vacuum medium, therefore,
Have that arc extinction performance is reliable, plurality of advantages that length in service life and transformer oil will not be polluted by electric arc.
Two, the spacer deviation between sheet width, sheet and the sheet of four static contacts in the static contact group of high-pressure side is utilized
Different, make three capacitance switchs achieve in handoff procedure and be initially switched off high pressure winding, again cutoff low winding,
Or first connect low pressure winding, then connect the purpose of high pressure winding.Have an advantage in that: first break high-pressure side winding,
Owing to high voltage side current is less, the electric arc of generation is the least, the most easily broken, and high-pressure side winding disconnects
After, low-pressure side winding just loses electric current, therefore, can avoid switching low-pressure side winding under big current situation
And burn the phenomenon of the dynamic and static contact of low pressure, thus effectively extend switch electric life.In like manner, low pressure is first connected
Side winding, then connect high-pressure side winding, can effectively protect dynamic and static contact, extend switch electric life.Simultaneously
This process is conducive to remanent magnetism in eliminating transformer iron core, it is to avoid when being again switched on high-pressure side winding shove and
Overvoltage, effectively reduces handoff procedure voltage pulsation amplitude.
Three, after vacuum insulation cylinder cylinder uses metal upper shell and nonmetal lower shell structure, quiet not affecting
Under the front topic that contact is arranged, solve vacuum insulation cylinder and all adopt when being made from an insulative material, the volume existed
Greatly, stress is easily produced during cast and problem that cylinder easily cracks.
For deepening the understanding of the present invention, it is described in further detail by embodiment below in conjunction with the accompanying drawings.
[accompanying drawing explanation]
Fig. 1 is the perspective view of one embodiment of the invention.
Fig. 2 is the perspective view of a capacitance switch in Fig. 1, does not draw upper cover plate structure in figure.
Fig. 3 is the structural representation after Fig. 2 longitudinally cutting.
Fig. 4 be Fig. 2 look up structural representation.
Fig. 5 is the plan structure schematic diagram of Fig. 2.
In figure: installing plate 1, the first pressure regulation operating mechanism 2, the second pressure regulation operating mechanism 3, static contact 4,
Diverter surface 41, fixing seat 5, capacity transfer operating mechanism 6, poke rod 7, cylinder 8, upper cover plate 81, lower cover
82, upper shell 83, installing hole 831, screw thread 832, lower shell 84, drive link 9, bellows 91, pass
Moving plate 92, bearing pin 93, drive plate 94, steady pin and compression spring 95, vacuum exhaust pipe 96, sealing ring
97, movable contact spring 10, high-pressure side static contact group Z, the first low-pressure side static contact group X, the second low-pressure side static contact
Group Y.
[detailed description of the invention]
See Fig. 1.Installing plate 1 is horizontal is fixedly mounted on transformer inner chamber top, and its end face is used for fixing
Functional unit, it may be assumed that capacity transfer operating mechanism the 6, first pressure regulation operating mechanism 2 and the second pressure regulation operating mechanism 3,
The composition structure of these three mechanism is identical, is respectively provided with a set of independent bistable permanent magnetic assembly and dials
Lever 7.The automatic controller output on coil connection transformer in bistable permanent magnetic assembly, poke rod 7
The iron core of upper end and coil be connected, be limited by iron core, shaft downwardly extends through installing plate 1.Install
The bottom surface of plate 1 is used for fixing switch block, it may be assumed that the first capacitance switch, the second capacitance switch and the 3rd capacity transfer
Switch, and the first tap changer and the second tap changer, the structures of these five switches are substantially uniform, from Fig. 1
Visible, each of which includes a vacuum insulation cylinder and a set of transmission component of into the barrel chamber thereof and one group of movable contact spring.
The cylinder 8 of vacuum insulation cylinder is fixed on installing plate 1 through fixing seat 5, the bottom of cylinder 8, circumference casting
Three groups of static contacts 4.In this example, a poke rod 7 of capacity transfer operating mechanism 6 and the first capacitance switch,
Three drive links 9 of two capacitance switchs or the 3rd capacitance switch constitute a link gear, it is achieved switching stationary contact
Sheet purpose.First pressure regulation operating mechanism 2 and the second pressure regulation operating mechanism 3 respectively corresponding first tap changer and
Second tap changer a, it may be assumed that tap changer is responsible for by each operating mechanism.
See Fig. 3, and combine Fig. 2, Fig. 4 and Fig. 5.Described transmission component includes drive link 9, bellows
91, driver blade 92, bearing pin 93, drive plate 94, steady pin and compression spring 95, sealing ring 97 and dynamic touch
Sheet 10.Bellows 91 is set on the shaft of drive link 9, its inner port and the shaft seal weld of drive link 9
Connecing, external port seals with the wall of cylinder 8 and welds, and bellows 91 can be with axial shrinkage and stretching, it is ensured that transmission
Sealing during bar 9 displacement.After poke rod 7 extends, with the outer end phase of the drive link 9 of cylinder 8 side
Couple, the other end sealed entrance cylinder 8 of drive link 9, the driver blade in bearing pin 93 with transmission component
92 is hinged.Driver blade 92 is fixed on the central shaft upper end of drive plate 94.Suitable with three groups of static contacts, three
Sheet movable contact spring 10 constitutes a group of overall turn, is radially positioned in transmission through steady pin and compression spring 95 thereof
The periphery of dish 94, touches with corresponding static contact group respectively and closes.During operation, poke rod 7 is through drive link 9, biography
Moving plate 92, central shaft make drive plate 94 rotation clockwise or counterclockwise, complete the switching of contact.
The structure of cylinder 8 has two schemes available: one is that cylinder 8 all uses insulating materials to cast
Overall structure, two is to use Split type structure as shown in Figure 3, it may be assumed that this cylinder 8 is by upper shell 83 and doffing
Body 84 two parts are constituted, and then screw through internal and external threads 832 sealing and connect into entirety.When the latter makes, on
Cylinder 83 can use metal material, has that the thin intensity of wall is high, take up room the plurality of advantages such as little.During assembling,
Seal for realizing the vacuum of insulating cylinder, after transmission component and movable contact spring 10 load cylinder 8, cover upper cover plate
81 and lower cover 82, along cover plate surrounding, gap sealing is good with fluid sealant.One is implanted in upper cover plate 81
Book wall steel pipe, it may be assumed that vacuum exhaust pipe 96, extracts chamber air out with vavuum pump, after vacuum to setting value,
With instrument, flat for book wall steel pipe folder and melting welding are sealed.
Cylinder 8 uses monoblock type or split type, otherwise varied to the sealing fixed solution of bellows 91 outer end.
During monoblock type, owing to using insulating materials casting to form, therefore, should in the bore receiving drive link 9
One metal insert is set, seals welding for bellows 91.Time split type, can be directly by bellows 91
Outer end seal weld be connected in bore opening's edge.
See Fig. 2 and Fig. 4, and combine Fig. 3 and Fig. 5.
Capacity transfer structure.In the first capacitance switch, the second capacitance switch or the 3rd capacitance switch, every capacity transfer
Three groups of static contacts of switch are respectively the first low-pressure side static contact group X, the second low-pressure side static contact group Y and high pressure
Side static contact piece group Z (is referred to as X group, Y group and Z group) individually below, often organize the contact of correspondence be respectively X1,
X2, X3, X4, Y1, Y2, Y3, Y4 and Z1, Z2, Z3, Z4 totally 12 contacts.They circumference casting
In the bottom of lower shell 84, often group contact separation certain interval.For a piece of static contact 4,12 connect
Point is exposed outside cylinder 8, and diverter surface 41 is then entirely located in vacuum into the barrel chamber.Capacitance switch switching construction
Innovation is: the sheet body width (i.e. the width of diverter surface 41) of eight static contacts 4 mutually in X group and Y group
Causing, the spacing distance between sheet with sheet is the most consistent；In Z group, the sheet body width of four static contacts 4 is the least
The sheet body width of the static contact 4 in X group and Y group.This structure brings following result: due to Z group
There are differences with stationary contact blade width, the sheet spacing of X group and Y group, make three movable contact springs 10 to synchronize
Switching occur in that the time difference: Z group is first broken, disconnected after X group and Y group, or, X group and Y group are first led to, Z
Lead to after group.The effect brought is: owing to high-pressure side Z group is first broken, and the little electric arc of electric current is the least, no
But easily broken, and after Z group disconnects, X group and Y group just lose electric current, therefore, it is to avoid at big electric current shape
Switching low-pressure side winding under condition and burn the phenomenon of dynamic and static contact, switch is long for service life, and reliability is high.
In like manner, low-pressure side winding X group and Y group are first led to, logical after the winding Z group of high-pressure side, can effectively protect dynamic and static
Contact.Meanwhile, remanent magnetism in this process is conducive to eliminating transformer iron core, it is to avoid be again switched on high-pressure side around
Shoving and overvoltage during group, effectively reduces handoff procedure voltage pulsation amplitude.
Pressure adjusting structure.Three groups of static contacts in first tap changer or the second tap changer are high-pressure side stationary contact
Sheet group, each group is made up of four static contacts respectively, and they circumferences cast on lower shell, and all stationary contacts
The sheet body width of sheet, and the spacing between sheet with sheet is consistent.
During work, automatic controller perform module output loop respectively with the 6, first pressure regulation of capacity transfer operating mechanism
Operating mechanism 2 is connected with the coil of the bistable permanent magnetic assembly in the second pressure regulation operating mechanism 3, when the most defeated
When going out loop triggering, according to the pre-conditioned corresponding output loop triggering execution module, thus control corresponding
Operating mechanism action, then gone to control capacitance switch or tap changer action by corresponding poke rod 7, and then complete
Become the switching of active and static contact, it is achieved capacity and pressure regulating purpose.
Above-described embodiment is only used for explaining invention thinking of the present invention, and is not construed as scope
Limit, any according to the simple variant structure done by embodiment, all should include the protection domain of the application in.
Claims (4)
1. an on-load voltage regulation capacity transfer shunting switch, including the installing plate being arranged in transformer oil box cavity,
And be placed in the functional unit at this installing plate top and be positioned at the switch block bottom this installing plate；Described operation
Parts include capacity transfer operating mechanism, the first pressure regulation operating mechanism and the second pressure regulation operating mechanism that structure is identical,
Described switch block includes the first capacitance switch, the second capacitance switch and the 3rd capacitance switch that structure is consistent,
And first tap changer, the second tap changer；Described capacity transfer operating mechanism, the first pressure regulation operating mechanism or
Second pressure regulation operating mechanism has a set of bistable permanent magnetic assembly and a poke rod thereof, the upper end of described poke rod with
Iron core in bistable permanent magnetic assembly is associated；Described first capacitance switch, the second capacitance switch, the 3rd tune
Hold switch, the first tap changer or the second tap changer, including an insulating cylinder, the into the barrel chamber of this insulating cylinder
It is provided with a set of transmission component and one group of movable contact spring, barrel bottom are embedded with three groups of static contacts；It is characterized in that: described
The barrel chamber of insulating cylinder is in sealing vacuum shape, and the diverter surface of described one group of movable contact spring and three groups of static contacts is respectively positioned on institute
State the vacuum into the barrel chamber of insulating cylinder；The cylinder of described insulating cylinder is by upper shell, lower shell, upper cover plate and lower cover
Plate sealingly connects and forms, and the lower shell that the upper shell that wherein metal material is made and nonmetallic materials make is spirally connected
Integral；Described three groups of static contacts are embedded on described lower shell；A vacuum it is provided with in described upper cover plate
Exhaust tube.
2. on-load voltage regulation capacity transfer shunting switch as claimed in claim 1, is characterized in that: described transmission component
Including drive link, bellows, driver blade, bearing pin, drive plate, steady pin and compression spring thereof；Bellows
Being set on the shaft of drive link, its inner port sealingly connects with shaft, and external port is close with the wall of described cylinder
Envelope couples；The outer end of described drive link is connected with described poke rod, and the inner of drive link is through bearing pin and transmission
Sheet is hinged, and this driver blade is fixed on the central shaft upper end of drive plate；Suitable with three groups of static contacts, three
It is peripheral that movable contact spring is radially positioned in described drive plate through steady pin and compression spring thereof.
3. on-load voltage regulation capacity transfer shunting switch as claimed in claim 1, is characterized in that: described first capacity transfer
Switch, three groups of static contacts of the second capacitance switch and the 3rd capacitance switch be respectively high-pressure side static contact group, the
One low-pressure side static contact group and the second low-pressure side static contact group；Each group is made up of four static contacts respectively, it
Circumference cast on lower shell, wherein: in the first low-pressure side static contact group and the second low-pressure side static contact group
The sheet body width of all static contacts is consistent, and the spacing distance between sheet with sheet is consistent, and high-pressure side stationary contact
In sheet group, the sheet body width of four static contacts is less than the sheet body width of the static contact in two low-pressure side static contact groups
Degree.
4. on-load voltage regulation capacity transfer shunting switch as claimed in claim 1, is characterized in that: described first pressure regulation
Three groups of static contacts in switch or the second tap changer are high-pressure side static contact group, and each group respectively by four
Static contact form, they circumferences cast on lower shell, and the sheet body width of all static contacts, and sheet with
Spacing distance between sheet is consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410321879.XA CN104112575B (en) | 2014-07-08 | 2014-07-08 | A kind of on-load voltage regulation capacity transfer shunting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410321879.XA CN104112575B (en) | 2014-07-08 | 2014-07-08 | A kind of on-load voltage regulation capacity transfer shunting switch |
Publications (2)
| Publication Number | Publication Date |
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| CN104112575A CN104112575A (en) | 2014-10-22 |
| CN104112575B true CN104112575B (en) | 2016-09-07 |
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| CN201410321879.XA Active CN104112575B (en) | 2014-07-08 | 2014-07-08 | A kind of on-load voltage regulation capacity transfer shunting switch |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204257420U (en) * | 2014-12-29 | 2015-04-08 | 刁俊起 | A kind of permanent magnetic drive on-load voltage regulating switch |
| CN104952603B (en) * | 2015-06-03 | 2017-08-08 | 浙江纪元电气科技股份有限公司 | Using the pressure regulating and capacitance regulating shunting switch of vacuum interrupter |
| CN108899184B (en) * | 2016-02-05 | 2021-07-13 | 浙江宝威电气有限公司 | Transformer on-load capacitance-regulating switch convenient for arc extinguishing |
| CN114242510B (en) * | 2021-11-03 | 2024-03-29 | 广东电网电动汽车服务有限公司 | Horizontal on-load capacity-regulating tapping switch |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807471B (en) * | 2009-02-13 | 2012-12-26 | 上海华明电力设备制造有限公司 | On-load tap-changer and no-arc transferring method of on-load tap-changer |
| JP2012094782A (en) * | 2010-10-28 | 2012-05-17 | Toshiba Corp | Gas-insulated on-load tap changer |
| CN102360851B (en) * | 2011-09-08 | 2013-05-15 | 北京博瑞莱智能科技有限公司 | Combined permanent-magnetic mechanism voltage/capacity adjusting switch |
| CN102709036B (en) * | 2012-03-31 | 2015-05-20 | 北京博瑞莱智能科技集团有限公司 | Automatic capacity regulating distribution transformer and capacity regulating method thereof |
| CN203397928U (en) * | 2013-07-12 | 2014-01-15 | 广州市德百顺电气科技有限公司 | Vacuum on-load tap-changer |
| CN204029591U (en) * | 2014-07-08 | 2014-12-17 | 纪元电气集团有限公司 | A kind of on-load voltage regulation capacity transfer shunting switch |
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Denomination of invention: On-load voltage regulating and capacitance regulating tapping switch Effective date of registration: 20170907 Granted publication date: 20160907 Pledgee: Ningbo flag flag Commercial Management Co., Ltd. Pledgor: Jiyuan Electric Group Co., Ltd.|Zhejiang era electrical Polytron Technologies Inc Registration number: 2017330000096 |
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Date of cancellation: 20181128 Granted publication date: 20160907 Pledgee: Ningbo flag flag Commercial Management Co., Ltd. Pledgor: Jiyuan Electric Group Co., Ltd.|Zhejiang era electrical Polytron Technologies Inc Registration number: 2017330000096 |
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Effective date of registration: 20200817 Address after: No.39 Jiangbin Road, Jiangshan City, Quzhou City, Zhejiang Province Co-patentee after: ZHEJIANG ERA HIGH VOLTAGE APPLIANCE SWITCH Co.,Ltd. Patentee after: Qiu Chenchen Address before: 324100, Zhejiang, Quzhou Province, Qing City, Qing Lake Town junction village junction No. 198 Co-patentee before: ZHEJIANG ERA HIGH VOLTAGE APPLIANCE SWITCH Co.,Ltd. Patentee before: JIYUAN ELECTRICAL GROUP Co.,Ltd. |
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Effective date of registration: 20201123 Address after: No.2 Longshan Road, Qinghu street, Jiangshan City, Quzhou City, Zhejiang Province Patentee after: Juyuan intelligent electric (Zhejiang) Co., Ltd Address before: No.39 Jiangbin Road, Jiangshan City, Quzhou City, Zhejiang Province Patentee before: Qiu Chenchen Patentee before: ZHEJIANG ERA HIGH VOLTAGE APPLIANCE SWITCH Co.,Ltd. |
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