CN204947749U - A kind of screw rod insulation system - Google Patents
A kind of screw rod insulation system Download PDFInfo
- Publication number
- CN204947749U CN204947749U CN201520646986.XU CN201520646986U CN204947749U CN 204947749 U CN204947749 U CN 204947749U CN 201520646986 U CN201520646986 U CN 201520646986U CN 204947749 U CN204947749 U CN 204947749U
- Authority
- CN
- China
- Prior art keywords
- screw rod
- insulator cap
- washer
- insulation system
- insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Insulating Bodies (AREA)
Abstract
The utility model discloses a kind of screw rod insulation system, comprise: steel washer 1, compacting part 2, insulating washer 3, also comprise insulated enclosure circle 4, insulator cap 5, described insulator cap 5 sealing is arranged on the two ends of screw rod 6, and described insulated enclosure circle 4 is between steel washer 1 and core ends pressing plate 7, between insulating washer 3 and core ends pressing plate 7; Described insulating washer 3 is between compacting part 2 and steel washer 1, between core ends pressing plate 7 and steel washer 1.The utility model increases insulator cap in screw rod end, insulator cap has attacked screw thread, has been threaded connection and is closely connected with screw rod end, effectively can prevent the face creepage phenomenon caused because outer surface is contaminated; Gap insulating washer in addition between screw rod and core ends pressing plate seals, and preventing pollution thing enters the inner surface of overhang insulation.
Description
Technical field
The utility model relates to technical field of motor manufacture, and specifically a kind of insulation system for motor stator core screw rod end is arranged.
Background technology
For reducing the eddy current loss produced at iron core when motor runs, usual motor stator core adopts the thin silicon steel plates of double-sided insulation to be overrided to form, and by screw rod, laminated core is fixed into entirety.Because screw rod is arranged in iron core alternating magnetic field, according to Faraday's electromagnetic induction law, in screw rod, electromotive force will be induced.If now screw rod has contact with stator core at 2, due to screw rod with " " form closed-loop path, thus will there will be electric current in screw rod.This electric current can cause screw rod to generate heat, and situation severe patient will make screw rod melt in core interior, and then cause adhesion between lamination, and iron core vortex loss increases, and last iron core burns because of overheated.
In order to prevent above-mentioned situation from occurring, two kinds of measures are mainly taked to insulate to screw rod at present:
1, in core interior, screw rod by wrapping insulating material, or puts insulating sleeve, screw rod and iron core is insulated,
2, outside at iron core, screw rod end pressing system and pressing plate contact position, end arrange insulating washer by screw rod end and core insulation.
Facts have proved through multiple power station, screw rod overhang insulation measure existing defects.Carbon dust, mist of oil is flooded with in running environment residing for stator.The end of screw rod is very easily by carbon dust, contaminated with oil mist.When pollutant is attached to screw rod end outer surface, because these pollutants have conductivity, thus screw rod end can form two points ground fault by these pollutants " creepage ".In addition, owing to there is gap between end compressing structure and screw rod, pollutant also can enter the inner surface of end compressing structure from this gap, can form two points ground fault equally because of inner surface " creepage ".As shown in Figure 1, A is that pollutant is attached to outer surface and is formed creepage, and B is that pollutant enters inner surface and formed creepage.
Summary of the invention
For now at present Problems existing and deficiency, in order to solve the defect that prior art exists, the utility model aims to provide one effectively can prevent screw rod end outer surface and the contaminated insulation system of inner surface, and concrete technical scheme is as follows:
A kind of screw rod insulation system, comprise: steel washer 1, compacting part 2, insulating washer 3, also comprise insulated enclosure circle 4, insulator cap 5, described insulator cap 5 sealing is arranged on the two ends of screw rod 6, and described insulated enclosure circle 4 is between steel washer 1 and core ends pressing plate 7, between insulating washer 3 and core ends pressing plate 7; Described insulating washer 3 is between compacting part 2 and steel washer 1, between core ends pressing plate 7 and steel washer 1.
Alternately, above-mentioned a kind of screw rod insulation system, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap 5 length direction.
Alternately, above-mentioned a kind of screw rod insulation system, described compacting part 2 is butterfly spring sleeve pipe 9, disc spring 10, and it is outside that described disc spring 10 is set in butterfly spring sleeve pipe 9.
Alternately, above-mentioned a kind of screw rod insulation system, described insulator cap 5 is connected with insulating washer 3 cylindrical, compacting part 2 outside or steel washer 1 cylindrical.
Alternately, above-mentioned a kind of screw rod insulation system, insulator cap openend 11 machining screw, described insulating washer 4 cylindrical, compacting part 2 outside or steel washer 1 Excircle machining screw thread, insulator cap 5 is threaded connection with insulating washer 4 cylindrical, compacting part 2 outside or steel washer 1 cylindrical.
Alternately, above-mentioned a kind of screw rod insulation system, described insulator cap 5 is connected by interference fit with insulating washer 3 cylindrical, compacting part 2 outside or steel washer 1 cylindrical.
Alternately, above-mentioned a kind of screw rod insulation system, insulator cap closed end 12 has the screwed hole 13 mated with screw rod 6, and described insulator cap 5 is threaded connection with screw rod 6.
Alternately, above-mentioned a kind of screw rod insulation system, described screw rod 6 passes from described insulating washer 3 and insulated enclosure circle 4 centre bore.
Alternately, above-mentioned a kind of screw rod insulation system, described insulator cap 5 is made up of insulating material.
Alternately, above-mentioned a kind of screw rod insulation system, the outside sheathed screw rod insulating sleeve 14 of described screw rod 6.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
In order to solve the problem, propose a kind of newly-designed overhang insulation structure.The utility model increases insulator cap in screw rod end, insulator cap has attacked screw thread, has been threaded connection and is closely connected with screw rod end, effectively can prevent the face creepage phenomenon caused because outer surface is contaminated; Gap insulating washer in addition between screw rod and pressing plate seals, and preventing pollution thing enters the inner surface of overhang insulation.The utility model tool has the following advantages:
1, the pollutants such as the carbon dust in generator bay, mist of oil effectively can be prevented to be attached to outer surface and the inner surface of screw rod end construction, thus the screw rod two points ground fault because surface creepage causes can be prevented.It is significant to the safe and stable operation of unit,
2, screw rod end and line stick end are relatively.Because stator bar is in high potential, and screw rod is in electronegative potential, therefore when Rated motor voltage is higher screw rod end and line stick end space smaller time, can because line rod to screw rod electric discharge and cause withstand voltage test not by.Insulation system in the utility model adds insulator cap in screw rod end, effectively can prevent the generation of phenomenon here.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is stator core screw rod overhang insulation structural representation in conventional art;
Fig. 2 is that in the utility model, a kind of screw rod insulation system has compacting part end embodiment one structural representation;
Fig. 3 is that in the utility model, a kind of screw rod insulation system has compacting part end embodiment two structural representation;
Fig. 4 is that in the utility model, a kind of screw rod insulation system has compacting part end embodiment three structural representation;
Fig. 5 be in the utility model a kind of screw rod insulation system without compacting part end embodiment one structural representation;
Fig. 6 be in the utility model a kind of screw rod insulation system without compacting part end embodiment two structural representation;
Fig. 7 be in the utility model a kind of screw rod insulation system without compacting part end embodiment three structural representation;
Fig. 8 is a kind of screw rod insulation system insulator cap embodiment one structural representation in the utility model;
Fig. 9 is a kind of screw rod insulation system insulator cap embodiment two structural representation in the utility model.
Reference numeral: 1 be steel washer, 2 for compacting part, 3 for insulating washer, 4 for insulated enclosure circle, 5 for insulator cap, 6 for screw rod, 7 for core ends pressing plate, 8 for insulator cap bottom surface, 9 for butterfly spring sleeve pipe, 10 for disc spring, 11 for insulator cap openend, 12 for insulator cap closed end, 13 for screwed hole, 14 for screw rod insulating sleeve, 15 for nut, 16 for insulation cap aperture.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
In recent years, there is the situation that screw rod insulation against ground resistance declines in multiple power station successively, although after necessarily processing, screw rod insulation against ground resistance can recover normal, and after running a period of time, identical situation still can repeat.Stator core punching screw rod is in alternating magnetic field, and inside screw will induce certain electromotive force.If screw rod and stator core insulation improper, as long as have 2 with stator core conducting form loop, then will there will be induced current in screw rod.Induced current causes screw rod heating even to melt, and affects the safe operation of motor.The effective monitoring means of current shortage judges that the underproof screw rod of insulation resistance is one point earth or two points ground fault on earth, and therefore once find the underproof screw rod of insulation against ground, all will process it, this has increased the weight of the workload of power plant maintenance personnel undoubtedly.The fundamental way addressed this problem adopts reliable insulation system.
In the utility model, as shown in Figure 2, Figure 3, Figure 4, compacting part 2 end is had at screw rod, described compacting part 2 can be butterfly spring sleeve pipe 9, disc spring 10, it is outside that described disc spring 9 is set in butterfly spring sleeve pipe 10, is made up of successively nut 15, steel washer 1, insulating washer 3, butterfly spring sleeve pipe 9, butterfly spring 10, steel washer 1, insulated enclosure circle 4.Due to the insulating effect of insulating washer 3, screw rod 6 end can with core insulation.Polluting pressing system outer surface for preventing from external contaminants causes screw rod creepage, and be processed into insulator cap 5 with insulating material such as nylon rod, as shown in Figure 8, described insulator cap 5 is enclosed within screw rod 6 end, and in steel washer 1 is wrapped in.In order to be fixed by insulator cap 5, described insulator cap 5 and insulating washer 3 cylindrical, compacting part 2 outside are connected by interference fit or are threaded.Being threaded as adopted, can adopting following several scheme: scheme 1: at insulator cap openend 11 tapping, the outer fenestra of insulating washer 3 has attacked screw thread simultaneously, and insulator cap 5 and insulating washer 3 are threaded connection fixing.Scheme 2: insulator cap openend 11 tapping, simultaneously compacting part 2, the outer fenestra tapping of such as butterfly spring sleeve pipe 9, insulator cap 5 and butterfly spring sleeve pipe 9 are threaded connection fixing.Scheme 3: as shown in Figure 9, insulator cap closed end 12 has screw thread, and is threaded connection fixing with screw rod 6 end.Pressing system inner surface is polluted for preventing from external contaminants, at steel washer 1 and core ends pressing plate 7 contact-making surface, insulated enclosure circle 4 is set, such as rubber seal, described insulated enclosure circle 4 endoporus and screw rod 6 external diameter close contact, thus by the gap shutoff between screw rod 6 and steel washer 1.Steel washer 1 inner circle is processed into suitable chamfering or concave station, to be compressed by insulated enclosure circle 4.The outside sheathed screw rod insulating sleeve 14 of described screw rod 6.
As shown in Fig. 5, Fig. 6, Fig. 7, at screw rod without there being compacting part 2 end, being made up of nut 15, steel washer 1, insulating washer 3 successively, insulated enclosure circle 4 forms.Due to the insulating effect of insulating washer 3, screw rod 6 end can with core insulation; Polluting pressing system outer surface for preventing from external contaminants causes screw rod creepage, and be processed into insulator cap 5 with insulating material such as nylon rod, as shown in Figure 8, described insulator cap 5 is enclosed within screw rod 6 end.In order to be fixed by insulator cap 5, described insulator cap 5 and insulating washer 3 cylindrical or steel washer 1 cylindrical are connected by interference fit or are threaded.Being threaded as adopted, can adopting following several scheme: scheme 1: at insulator cap openend 11 tapping, the outer fenestra of insulating washer 3 has attacked screw thread simultaneously, and insulator cap 5 and insulating washer 3 are threaded connection fixing.Scheme 2: insulator cap openend 11 tapping, the simultaneously outer fenestra tapping of steel washer 1, insulator cap 5 and steel washer 1 are threaded connection fixing.Scheme 3: as shown in Figure 9, insulator cap closed end 12 has screw thread, and is threaded connection fixing with screw rod 6 end.Pressing system inner surface is polluted for preventing from external contaminants, at insulating washer 3 and the contact-making surface of core ends pressing plate 7, insulated enclosure circle 4 is set, such as rubber seal, described insulated enclosure circle 4 endoporus and screw rod 6 external diameter close contact, thus by the gap shutoff between screw rod 6 and steel washer 1.Insulating washer 3 inner circle is processed into suitable chamfering or concave station, to be compressed by insulated enclosure circle 4.The outside sheathed screw rod insulating sleeve 14 of described screw rod 6.
There is compacting part end specific embodiment one:
As shown in Figure 2, a kind of screw rod insulation system, this structure has compacting part end by insulated enclosure circle 4, steel washer 1, butterfly spring 10, butterfly spring sleeve pipe 9, insulating washer 4, nut 15 at screw rod, and insulator cap 5 is formed.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between butterfly spring sleeve pipe 9 and steel washer 1, and described insulated enclosure circle 4 is between steel washer 1 and core ends pressing plate 7.Tell screw rod 6 and pass from the centre bore of described insulating washer 3 and insulated enclosure circle 4.
Insulator cap openend 11 machining screw, insulating washer 3 Excircle machining screw thread, insulator cap 5 and insulating washer 3 are threaded connection.
There is compacting part end specific embodiment two:
As shown in Figure 3, a kind of screw rod insulation system, this structure has compacting part end by insulated enclosure circle 4, steel washer 1, butterfly spring 10, butterfly spring sleeve pipe 9, insulating washer 4, nut 15 at screw rod, and insulator cap 5 is formed.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between butterfly spring sleeve pipe 9 and steel washer 1, and described insulated enclosure circle 4 is between steel washer 1 and core ends pressing plate 7.Tell screw rod 6 and pass from the centre bore of described insulating washer 3 and insulated enclosure circle 4.
Insulator cap openend 11 machining screw, butterfly spring sleeve pipe 9 Excircle machining screw thread, insulator cap 5 is crossed with butterfly spring sleeve pipe logical 9 and is threaded.
There is compacting part end specific embodiment three:
As shown in Figure 4, a kind of screw rod insulation system, this structure has compacting part end by insulated enclosure circle 4, steel washer 1, butterfly spring 10, butterfly spring sleeve pipe 9, insulating washer 4, nut 15 at screw rod, and insulator cap 5 is formed.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between butterfly spring sleeve pipe 9 and steel washer 1, and described insulated enclosure circle 4 is between steel washer 1 and core ends pressing plate 7.Tell screw rod 6 and pass from the centre bore of described insulating washer 3 and insulated enclosure circle 4.
Insulator cap closed end 11 has the screwed hole 13 mated with screw rod 6, and insulator cap 5 and screw rod 6 are threaded connection.
Without compacting part end specific embodiment one:
As shown in Figure 5, a kind of screw rod insulation system, this structure is made up of insulated enclosure circle 4, insulating washer 3, steel washer 1, nut 15, insulator cap 5 without compacting part end at screw rod.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between core ends pressing plate 7 and steel washer 1, and described insulated enclosure circle 4 is between insulating washer 3 and core ends pressing plate 7.Described screw rod 6 passes from described insulating washer 3 and insulated enclosure circle 4 centre bore.
Insulator cap openend 11 machining screw, insulating washer 3 Excircle machining screw thread, insulator cap 5 and insulating washer 3 are threaded connection.
There is compacting part end specific embodiment two:
As shown in Figure 6, a kind of screw rod insulation system, this structure is made up of insulated enclosure circle 4, insulating washer 3, steel washer 1, nut 15, insulator cap 5 without compacting part end at screw rod.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between core ends pressing plate 7 and steel washer 1, and described insulated enclosure circle 4 is between insulating washer 3 and core ends pressing plate 7.Described screw rod 6 passes from described insulating washer 3 and insulated enclosure circle 4 centre bore.
Insulator cap openend 11 machining screw, steel washer 1 Excircle machining screw thread, insulator cap 5 and steel washer 1 are threaded connection.
There is compacting part end specific embodiment three:
As shown in Figure 7, a kind of screw rod insulation system, this structure is made up of insulated enclosure circle 4, insulating washer 3, steel washer 1, nut 15, insulator cap 5 without compacting part end at screw rod.Described insulator cap 5 is made up of insulating material, and center, insulator cap bottom surface 8 has the insulation cap aperture 16 not running through insulator cap length direction.Described insulating washer 3 is between core ends pressing plate 7 and steel washer 1, and described insulated enclosure circle 4 is between insulating washer 3 and core ends pressing plate 7.Described screw rod 6 passes from described insulating washer 3 and insulated enclosure circle 4 centre bore.
Insulator cap closed end 11 has the screwed hole 13 mated with screw rod 6, and insulator cap 5 and screw rod 6 are threaded connection.
The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (10)
1. a screw rod insulation system, comprise: steel washer (1), compacting part (2), insulating washer (3), it is characterized in that: also comprise insulated enclosure circle (4), insulator cap (5), described insulator cap (5) sealing is arranged on the two ends of screw rod (6), and described insulated enclosure circle (4) is positioned between steel washer (1) and core ends pressing plate (7), is positioned between insulating washer (3) and core ends pressing plate (7); Described insulating washer (3) is positioned between compacting part (2) and steel washer (1), is positioned between core ends pressing plate (7) and steel washer (1).
2. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: insulator cap bottom surface (8) have the insulation cap aperture (16) not running through insulator cap (5) length direction.
3. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: described compacting part (2) is butterfly spring sleeve pipe (9), disc spring (10), and it is outside that described disc spring (10) is set in butterfly spring sleeve pipe (9).
4. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: described insulator cap (5) is connected with insulating washer (3) cylindrical, compacting part (2) outside or steel washer (1) cylindrical.
5. a kind of screw rod insulation system as claimed in claim 4, it is characterized in that: insulator cap openend (11) machining screw, described insulating washer (4) cylindrical, compacting part (2) outside or steel washer (1) Excircle machining screw thread, insulator cap (5) is threaded connection with insulating washer (4) cylindrical, compacting part (2) outside or steel washer (1) cylindrical.
6. a kind of screw rod insulation system as claimed in claim 4, is characterized in that: described insulator cap (5) is connected by interference fit with insulating washer (3) cylindrical, compacting part (2) outside or steel washer (1) cylindrical.
7. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: insulator cap closed end (12) has the screwed hole (13) mated with screw rod (6), and described insulator cap (5) and screw rod (6) are threaded connection.
8. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: described screw rod (6) passes from described insulating washer (3) and insulated enclosure circle (4) centre bore.
9. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: described insulator cap (5) is made up of insulating material.
10. a kind of screw rod insulation system as claimed in claim 1, is characterized in that: the outside sheathed screw rod insulating sleeve (14) of described screw rod (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646986.XU CN204947749U (en) | 2015-08-26 | 2015-08-26 | A kind of screw rod insulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646986.XU CN204947749U (en) | 2015-08-26 | 2015-08-26 | A kind of screw rod insulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204947749U true CN204947749U (en) | 2016-01-06 |
Family
ID=55015138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520646986.XU Active CN204947749U (en) | 2015-08-26 | 2015-08-26 | A kind of screw rod insulation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204947749U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107170537A (en) * | 2017-06-28 | 2017-09-15 | 河南森源电气股份有限公司 | A kind of insulator cap, insulating cylinder and use its insulation system and transfer bus component |
| CN109950026A (en) * | 2019-03-20 | 2019-06-28 | 山东电力设备有限公司 | Reactor iron yoke clamping structure and its processing method |
| CN110832751A (en) * | 2017-06-26 | 2020-02-21 | 法雷奥电机设备公司 | Mechanical assembly with electrical insulation between a rotating electrical machine and its electronic components |
-
2015
- 2015-08-26 CN CN201520646986.XU patent/CN204947749U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110832751A (en) * | 2017-06-26 | 2020-02-21 | 法雷奥电机设备公司 | Mechanical assembly with electrical insulation between a rotating electrical machine and its electronic components |
| CN107170537A (en) * | 2017-06-28 | 2017-09-15 | 河南森源电气股份有限公司 | A kind of insulator cap, insulating cylinder and use its insulation system and transfer bus component |
| CN107170537B (en) * | 2017-06-28 | 2023-12-22 | 河南森源电气股份有限公司 | Insulating cap, insulating cylinder, insulating structure using insulating cap and switching bus assembly |
| CN109950026A (en) * | 2019-03-20 | 2019-06-28 | 山东电力设备有限公司 | Reactor iron yoke clamping structure and its processing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204947749U (en) | A kind of screw rod insulation system | |
| CN102798757B (en) | Method and system for detecting contact resistance of bus joint of GIS (Geographic Information System) | |
| CN103616608A (en) | Intelligent monitoring device andg method for electric contact state of gas-insulation switch contactor | |
| CN202737356U (en) | Lubricating device for charged high-voltage isolator | |
| CN109413784B (en) | Electromagnetic heating temperature control device for following wheel set in low-temperature environment | |
| CN206321763U (en) | Outdoor high-voltage isolating switch body health degree monitoring device | |
| CN201590705U (en) | Insulated bearing sleeve used for motor | |
| CN202374125U (en) | Grounding brush device of alternating current variable frequency motor | |
| CN202524053U (en) | Electric arc failure protector | |
| CN103077791A (en) | Metallic oxide lightning arrester with built-in insulation base | |
| CN205643612U (en) | Detection frock that medium -tension bushing is withstand voltage | |
| CN204228889U (en) | Single-core high-voltage cable screen armour ground connection on-line intelligence monitoring system | |
| CN110867315B (en) | Current transformer for series capacitance compensation device | |
| CN102780176B (en) | Method for reducing insulation overhead ground wire induction voltage of alternating current transmission line | |
| CN103941165B (en) | GIS device experimental rig and method | |
| CN202962927U (en) | Energized operation device for power transmission and distribution line insulators | |
| CN203608038U (en) | Installation structure of conductive screw of static excitation generator | |
| CN205981487U (en) | Novel high -voltage switch temperature monitoring device | |
| CN203691659U (en) | Mine downhole electrical device moistureproof heater | |
| CN203443987U (en) | Fault arc generator | |
| He et al. | Analysis of Broken Lines at Overhead Ground Wire and Pre-twisted Wire Port Based on Skin Effect | |
| CN103700475A (en) | Voltage transformer fuse mounting base | |
| CN210863789U (en) | Improve CVT middling pressure tap and generate heat's voltage-sharing cap | |
| CN103000333B (en) | Magnetizing tool of permanent-magnetic machine and using method thereof | |
| CN203491170U (en) | 10kV outdoor high voltage isolation switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |