CN104201595A - Main insulator used for solid insulating switch equipment - Google Patents
Main insulator used for solid insulating switch equipment Download PDFInfo
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- CN104201595A CN104201595A CN201410502582.3A CN201410502582A CN104201595A CN 104201595 A CN104201595 A CN 104201595A CN 201410502582 A CN201410502582 A CN 201410502582A CN 104201595 A CN104201595 A CN 104201595A
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- insulating cylinder
- vacuum interrupter
- main
- insulating
- insulation
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention discloses a main insulator used for solid insulating switch equipment, and belongs to the field of electromechanical equipment. The main insulator comprises an insulating cylinder, a vacuum arc-extinguishing chamber, an electrified display sensor, an incoming and outgoing wire sleeve, an incoming and outgoing wire conducting rod, a shielding cover, an earthing terminal stationary contact fixing nut, an earthing terminal stationary contact insulating umbrella skirt, a main bus sleeve, a bus conducting rod, an insulation terminal stationary contact insulating umbrella skirt, a sealing groove, positioning grooves, rear guiding grooves, front guiding grooves, embedding nuts, a through hole, an observing window, an arc-extinguishing chamber insulating umbrella skirt, M8 copper embedding nuts, reinforcing ribs and creepage extenders. The main insulator adopts a unit modular structure, is simple in structure, free of maintenance, full-insulated and full-sealed, avoids the use of greenhouse gases, and is provided the outer surface which can be touched; through the arrangement of the sealing groove, the leakproofness and anti-dirt capability of the insulating cylinder are improved; the vacuum arc-extinguishing chamber is utilized to perform arc-extinguishing, the size is small, the insulating performance is reliable, the standardization of the module is realize, the use is safe, and the maintenance is not needed, while the size of the switch equipment matched with the insulator is reduced.
Description
Technical field
The invention belongs to electromechanical equipment field, particularly a kind of main insulation body for solid-state insulated switchgear.
Background technology
In current switch industry, Medium Voltage Switchgear is widely used, and middle pressure on ring main unit market, adopts gas-insulated ring network cabinet mostly at present, and the dielectric in gas-insulated ring network cabinet and arc-extinguishing medium adopt SF conventionally
6(sulphur hexafluoride) gas.SF
6the harm of gas is mainly reflected in two aspects: the chemical reaction product that first high-temperature electric arc catabolite and itself (or catabolite) and contact medium occur is to biological toxic action, the SF in electric equipment
6gas and analyte react with insulating material and can generate some toxic products, as with the insulating part such as the epoxy novolac glass fiber fabric swatch that contains silicon composition (rod, pipe), or chemically react with poured with epoxy resin part, molding and porcelain vase, silicon rubber, silicone grease etc. that quartz sand, glass are made filler, generate SiF
4, Si (CH
3) 2F
2deng product, be huge to the harm of human body and environment; It two is SF
6gas is the harm to environment as a kind of greenhouse gas, and Kyoto Protocol clearly specifies SF
6gas is one of six kinds of greenhouse gas, and it is used and discharge clear and definite restriction requirement; And at the field of employment of relative closure, SF
6the SF that gas-insulated ring network cabinet leaks
6gas and analyte thereof are not easy diffusion, can cause poisoning, the injury such as suffocate to being in personnel in its environment, and atmospheric environment is caused to great pollution.
Summary of the invention
Technical problem to be solved by this invention: provide a kind of main insulation body for solid-state insulated switchgear, with solving the SF that in prior art, gas-insulated ring network cabinet leaks
6gas and analyte thereof are not easy diffusion, can cause poisoning, the injury such as suffocate to being in personnel in its environment, and atmospheric environment be caused to the technical problems such as great pollution.
A kind of main insulation body for solid-state insulated switchgear, it is characterized in that: a kind of main insulation body for solid-state insulated switchgear, it is characterized in that: comprise insulating cylinder, vacuum interrupter, charged demonstration transducer, inlet-outlet sleeve, line conducting rod, screening cover, earth terminal fixed contact hold-down nut, earth terminal static contact and insulation full skirt, main bus bar sleeve pipe, bus conductive rod, isolation end static contact and insulation full skirt, seal groove, location notch, rear gathering sill, front gathering sill, embedded nut, through hole, observation window, arc control device insulation full skirt, M8 copper embedded nut, reinforcement, climb skirt, described insulating cylinder inside is provided with cavity, described vacuum interrupter is arranged at the front portion at the bottom of insulating cylinder inner chamber, and top and the bottom of vacuum interrupter are provided with screwed hole, and is provided with arc control device insulation full skirt on the top of vacuum interrupter, described charged demonstration sensor sensing parts are φ 50 gauze screens, and φ 50 gauze screens are enclosed within the outside of line conducting rod, and charged demonstration transducer display unit is connected with outside by M4 screwed hole, described inlet-outlet sleeve is positioned at the bottom of insulating cylinder front end, forms the frustum of a cone that protrudes from insulating cylinder front end surface, described line conducting rod is arranged in inlet-outlet sleeve, and one end of line conducting rod is connected with vacuum interrupter by bolt, and the other end is provided with internal thread, described screening cover is positioned at line conducting rod and vacuum interrupter junction, described earth terminal fixed contact hold-down nut is arranged at the centre position of bottom in insulating cylinder chamber, described earth terminal static contact and insulation full skirt is arranged at the top of earth terminal fixed contact hold-down nut, described main bus bar sleeve pipe is positioned at rear portion, insulating cylinder lower end, forms the frustum of a cone that protrudes from insulating cylinder rear surface, described bus conductive rod is positioned at main bus bar sleeve pipe, and two ends are provided with internal thread, described isolation end static contact and insulation full skirt is positioned at the top of bus conductive rod, described seal groove is annular, is arranged on the upper surface of insulating cylinder, is provided with sealing ring in seal groove, described rear gathering sill quantity is 2, is symmetricly set on insulating cylinder inner chamber two side, described front gathering sill quantity is 2, is symmetricly set on insulating cylinder inner chamber two side, described location notch quantity is 4, is positioned at the top on rear gathering sill and front gathering sill top, described embedded nut quantity is 13, is uniformly distributed in the upper surface of insulating cylinder along seal groove, described through hole is arranged at the top of insulating cylinder front end, described observation window covers through hole completely, and is fixedly mounted on insulating cylinder front end upper surface by bolt and sealing ring, described M8 copper embedded nut quantity is 4, is arranged at insulating cylinder front end bottom, and is evenly distributed on the surrounding of inlet-outlet sleeve, being distributed on insulating cylinder inner chamber two side of described reinforcement symmetry, the described skirt quantity of climbing is 3 roads, is arranged at insulating cylinder intracavity bottom, between earth terminal static contact and insulation full skirt and isolation end static contact and insulation full skirt.
The material of described insulating cylinder is epoxy resin, adopts automatic pressure gelation process cast to form.
Described vacuum interrupter is circuit breaker vacuum interrupter or vacuum arc extinguishing chamber for loading switch.
Described vacuum extinction outdoor face adopts silicon rubber to carry out encapsulate.
Described insulating cylinder outer surface is coated with zinc coat or semi-conductive layer, wherein this coat not on the faying face of outer surface, observation window and the insulating cylinder of the outer surface of inlet-outlet sleeve, main bus bar sleeve pipe and the round boss face taking M4 screwed hole as the center of circle taking 1.2cm as radius.
Described inlet-outlet sleeve, main bus bar sleeve pipe are the European standard taper of IEC of 630A.
By adopting technique scheme, the present invention can bring following beneficial effect:
1, insulating cylinder adopts automatic pressure gel technology (APG) cast to form by epoxy resin, and by each parts sealings such as vacuum interrupter, charged demonstration transducer, line conducting rod, main bus bar conducting rod, screening covers in insulating cylinder, adopt the insulation form of solid dielectric insulation, avoided SF
6gas and the generation of analyte to problems such as atmospheric environment pollute thereof.
2, insulating cylinder inner chamber is provided with 2 road reinforcements and has strengthened the mechanical strength of insulating cylinder, insulating cylinder outer surface is coated with zinc coat or semi-conductive layer, insulating cylinder is external surface grounded, play uniform electric field, avoided electric charge to gather, suppress phase fault and prevent the effect that operating personnel get an electric shock, overcome the deficiency of the aspects such as current gas-insulated ring network cabinet phase insulation, arc-extinguishing medium, the palp position of people is tangible, has improved insulating reliability and safety in utilization.
3, vacuum interrupter is in sealing front bottom in insulating cylinder, and its outer surface has carried out encapsulate processing with silastic material, has eliminated cause arc control device external insulation pottery outer surface or ceramic thickness direction by the generation of high electrical breakdown problem because of air gap completely.And outsourcing is encapsulated in the silicon rubber of arc control device as elastic insulated resilient coating, solves the ceramic material of epoxy resin and arc control device in sealing insulator and caused relative motion and then the problem of destroying insulation property and being punctured by high-tension electricity because expanding with heat and contract with cold.
4, whether the setting of charged demonstration transducer, can intuitively understand electric equipment with working voltage.
5, main insulation body three-phase is respectively independent, and every by primary conductive loop and vacuum interrupter (circuit breaker with or on-load switch with), sealing is in dielectric inside respectively mutually, and screening cover plays good electric field shielding and makes the equally distributed effect of electric field; The setting of climbing skirt, earth terminal static contact and insulation full skirt, isolation end static contact and insulation full skirt and arc control device insulation full skirt, has increased the creep distance between fracture, has reached splendid insulation and the effect of electric field shielding.
6, the M8 copper embedded nut that inlet-outlet sleeve surrounding arranges, for fixing of insulating cylinder, also can be used for the fixed installation of the current transformer matching with it.
7, the present invention designs uniqueness, meets the instructions for use of 12kV and 24kV switchgear completely; Be provided with seal groove, be convenient to and being connected and fixed of other module of switchgear, and ensure the sealing of insulating cylinder, therefore stain resistance strengthens greatly; Utilize vacuum interrupter arc extinguishing, volume is little, insulation property are reliable, modularization standardization, use are safe, non-maintaining, reduced simultaneously join the volume of switchgear.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is sectional structure schematic diagram of the present invention.
In figure, 1 for insulating cylinder, 2 is for vacuum interrupter, 3 is for charged demonstration transducer, 4 is for inlet-outlet sleeve, 5 is for line conducting rod, 6 is for screening cover, 7 is for earth terminal fixed contact hold-down nut, 8 is for earth terminal static contact and insulation full skirt, 9 is for main bus bar sleeve pipe, 10 is for bus conductive rod, 11 is for isolation end static contact and insulation full skirt, 12 is for seal groove, 13 is for rear gathering sill, 14 is for front gathering sill, 15 is for location notch, 16 is for embedded nut, 17 is for through hole, 18 is for observation window, 19 is for arc control device insulation full skirt, 20 is for M8 copper embedded nut, 21 is for reinforcement, 22 is for climbing skirt.
Embodiment
As shown in the figure, a kind of main insulation body for solid-state insulated switchgear of the present invention, it is characterized in that: comprise insulating cylinder 1, vacuum interrupter 2, charged demonstration transducer 3, inlet-outlet sleeve 4, line conducting rod 5, screening cover 6, earth terminal fixed contact hold-down nut 7, earth terminal static contact and insulation full skirt 8, main bus bar sleeve pipe 9, bus conductive rod 10, isolation end static contact and insulation full skirt 11, seal groove 12, rear gathering sill 13, front gathering sill 14, location notch 15, embedded nut 16, through hole 17, observation window 18, arc control device insulation full skirt 19, M8 copper embedded nut 20, reinforcement 21, climb skirt 22, described insulating cylinder 1 inside is provided with cavity, described vacuum interrupter 2 is arranged at the front portion at the bottom of insulating cylinder 1 inner chamber, and top and the bottom of vacuum interrupter 2 are provided with screwed hole, and is provided with arc control device insulation full skirt 19 on the top of vacuum interrupter 2, described charged demonstration transducer 3 inductive means are φ 50 gauze screens, and φ 50 gauze screens are enclosed within the outside of line conducting rod 5, and charged demonstration transducer 3 display units are connected with outside by M4 screwed hole, described inlet-outlet sleeve 4 is positioned at the bottom of insulating cylinder 1 front end, forms the frustum of a cone that protrudes from insulating cylinder 1 front end surface, described line conducting rod 5 is arranged in inlet-outlet sleeve 4, and one end of line conducting rod 5 is connected with vacuum interrupter 2 by bolt, and the other end is provided with internal thread, described screening cover 6 is positioned at line conducting rod 5 and vacuum interrupter 2 junctions, described earth terminal fixed contact hold-down nut 7 is arranged at the centre position of bottom in insulating cylinder 1 chamber, described earth terminal static contact and insulation full skirt 8 is arranged at the top of earth terminal fixed contact hold-down nut 7, described main bus bar sleeve pipe 9 is positioned at insulating cylinder 1 rear portion, lower end, forms the frustum of a cone that protrudes from insulating cylinder 1 rear surface, described bus conductive rod 10 is positioned at main bus bar sleeve pipe 9, and two ends are provided with internal thread, described isolation end static contact and insulation full skirt 11 is positioned at the top of bus conductive rod 10, described seal groove 12 is annular, is arranged on the upper surface of insulating cylinder 1, in seal groove 12, is provided with sealing ring, described rear gathering sill 13 quantity are 2, are symmetricly set on insulating cylinder 1 inner chamber two side, described front gathering sill 14 quantity are 2, are symmetricly set on insulating cylinder 1 inner chamber two side, described location notch 15 quantity are 4, are positioned at the top on rear gathering sill 13 and front gathering sill 14 tops, described embedded nut 16 quantity are 13, are uniformly distributed in the upper surface of insulating cylinder 1 along seal groove 12, described through hole 17 is arranged at the top of insulating cylinder 1 front end, described observation window 18 covers through hole 17 completely, and is fixedly mounted on insulating cylinder 1 front end upper surface by bolt and sealing ring, described M8 copper embedded nut 20 quantity are 4, are arranged at insulating cylinder 1 front end bottom, and are evenly distributed on the surrounding of inlet-outlet sleeve 4, being distributed on insulating cylinder 1 inner chamber two side of described reinforcement 21 symmetries, described to climb skirt 22 quantity be 3 roads, is arranged at insulating cylinder 1 intracavity bottom, between earth terminal static contact and insulation full skirt 8 and isolation end static contact and insulation full skirt 11.
The material of described insulating cylinder 1 is epoxy resin, adopts automatic pressure gelation process (APG) cast to form.Insulating cylinder 1 outer surface is coated with zinc coat or semi-conductive layer, plays uniform electric field, avoids electric charge gather, suppress phase fault and prevent the effect that operating personnel get an electric shock, and has improved usage safety performance.
Described vacuum interrupter 2 is circuit breaker vacuum interrupter or vacuum arc extinguishing chamber for loading switch.
Described vacuum interrupter 2 outer surfaces adopt silicon rubber to carry out encapsulate.
Described inlet-outlet sleeve 4, main bus bar sleeve pipe 9 are the European standard taper of IEC of 630A, and this design is more suitable for the standardization of electric cable accessories, main bus bar system, supporting and installation.
Described screening cover 6 plays good electric field shielding and makes to be uniformly distributed the effect of electric field.
Described earth terminal fixed contact hold-down nut 7 is for dead earth end fixed contact.
Earth terminal insulation full skirt 8, isolation end insulation full skirt 11, the arc control device insulation full skirt 19 of insulating cylinder 1 chamber inner bottom part setting and climb skirt 22, has strengthened creepage distance, has improved insulation property.The reinforcement 21 arranging on the inwall of both sides in insulating cylinder 1 chamber has improved the mechanical strength of insulating cylinder 1.
The upper end of described bus conductive rod 10 is provided with internal thread hole, for the installation of isolation knife fixed contact.
The seal groove 12 that insulating cylinder 1 upper surface arranges, inside is provided with sealing ring, plays the effect of sealing, avoids dust, moisture to enter in the chamber of insulating cylinder 1.
Guide function when front gathering sill 14, the rear gathering sill 13 that in insulating cylinder 1 chamber, both sides arrange moves up and down for joined isolation knife moving contact.
Locating groove when the location notch 15 of front gathering sill 14, rear gathering sill 13 tops is installed by joining isolation knife moving contact.
The embedded nut 16 that insulating cylinder 1 upper surface arranges is for the fixed installation of main insulation body.
Be positioned at the through hole 17 of insulating cylinder 1 upper front end and observation window 18 for observing the splitting or integrating lock state of joined isolation knife and earthing.
Described M8 copper embedded nut 20 quantity are 4, are arranged at insulating cylinder 1 front end bottom, and are evenly distributed on the surrounding of inlet-outlet sleeve 4, for fixing of insulating cylinder 1, also can be used for the fixed installation of institute's distribution current transformer.
The present invention is unit-modularized structure, insulating cylinder 1 inner chamber also can be installed the moving of isolation knife, fixed contact, ground connection conducting rod and connection vacuum interrupter 2 are flexible coupling with fixed contact, by all primary conductives loop, isolation knife, earthing is all enclosed in the insulating cylinder 1 by poured with epoxy resin, insulating cylinder 1 outer surface is coated with zinc coat or semi-conductive layer, and reliable ground, live part is realized full-insulated full-sealed, insulating reliability and safety in utilization are improved, degree of protection IP67, overcome current gas-insulated ring network cabinet phase insulation, the deficiency of the aspects such as arc-extinguishing medium, and avoid because using SF
6gas and the SF that causes
6the discharge of gas and analyte thereof or the pollution of leakage to atmosphere and the injury to human body.
Claims (6)
1. the main insulation body for solid-state insulated switchgear, it is characterized in that: comprise insulating cylinder (1), vacuum interrupter (2), charged demonstration transducer (3), inlet-outlet sleeve (4), line conducting rod (5), screening cover (6), earth terminal fixed contact hold-down nut (7), earth terminal static contact and insulation full skirt (8), main bus bar sleeve pipe (9), bus conductive rod (10), isolation end static contact and insulation full skirt (11), seal groove (12), rear gathering sill (13), front gathering sill (14), location notch (15), embedded nut (16), through hole (17), observation window (18), arc control device insulation full skirts (19), M8 copper embedded nut (20), reinforcement (21), climb skirt (22), described insulating cylinder (1) inside is provided with cavity, described vacuum interrupter (2) is arranged at the front portion at the bottom of insulating cylinder (1) inner chamber, top and the bottom of vacuum interrupter (2) are provided with screwed hole, and are provided with arc control device insulation full skirts (19) on the top of vacuum interrupter (2), described charged demonstration transducer (3) inductive means is φ 50 gauze screens, and φ 50 gauze screens are enclosed within the outside of line conducting rod (5), and charged demonstration transducer (3) display unit is connected with outside by M4 screwed hole, described inlet-outlet sleeve (4) is positioned at the bottom of insulating cylinder (1) front end, forms the frustum of a cone that protrudes from insulating cylinder (1) front end surface, described line conducting rod (5) is arranged in inlet-outlet sleeve (4), and one end of line conducting rod (5) is connected with vacuum interrupter (2) by bolt, and the other end is provided with internal thread, described screening cover (6) is positioned at line conducting rod (5) and vacuum interrupter (2) junction, described earth terminal fixed contact hold-down nut (7) is arranged at the centre position of bottom in insulating cylinder (1) chamber, described earth terminal static contact and insulation full skirt (8) is arranged at the top of earth terminal fixed contact hold-down nut (7), described main bus bar sleeve pipe (9) is positioned at insulating cylinder (1) rear portion, lower end, forms the frustum of a cone that protrudes from insulating cylinder (1) rear surface, described bus conductive rod (10) is positioned at main bus bar sleeve pipe (9), and two ends are provided with internal thread, described isolation end static contact and insulation full skirt (11) is positioned at the top of bus conductive rod (10), described seal groove (12) is annular, is arranged on the upper surface of insulating cylinder (1), and seal groove is provided with sealing ring in (12), described rear gathering sill (13) quantity is 2, is symmetricly set on insulating cylinder (1) inner chamber two side, described front gathering sill (14) quantity is 2, is symmetricly set on insulating cylinder (1) inner chamber two side, described location notch (15) quantity is 4, is positioned at the top on rear gathering sill (13) and front gathering sill (14) top, described embedded nut (16) quantity is 13, is uniformly distributed in the upper surface of insulating cylinder (1) along seal groove (12), described through hole (17) is arranged at the top of insulating cylinder (1) front end, described observation window (18) covers through hole (17) completely, and is fixedly mounted on insulating cylinder (1) front end upper surface by bolt and sealing ring, described M8 copper embedded nut (20) quantity is 4, is arranged at insulating cylinder (1) front end bottom, and is evenly distributed on the surrounding of inlet-outlet sleeve (4), what described reinforcement (21) was symmetrical is distributed on insulating cylinder (1) inner chamber two side, described to climb skirt (22) quantity be 3 roads, is arranged at insulating cylinder (1) intracavity bottom, is positioned between earth terminal static contact and insulation full skirt (8) and isolation end static contact and insulation full skirt (11).
2. a kind of main insulation body for solid-state insulated switchgear according to claim 1, is characterized in that: the material of described insulating cylinder (1) is epoxy resin, adopts automatic pressure gelation process cast to form.
3. a kind of main insulation body for solid-state insulated switchgear according to claim 1, is characterized in that: described vacuum interrupter (2) is circuit breaker vacuum interrupter or vacuum arc extinguishing chamber for loading switch.
4. a kind of main insulation body for solid-state insulated switchgear according to claim 1 and 2, is characterized in that: described vacuum interrupter (2) outer surface adopts silicon rubber to carry out encapsulate.
5. a kind of main insulation body for solid-state insulated switchgear according to claim 1, it is characterized in that: described insulating cylinder (1) outer surface is coated with zinc coat or semi-conductive layer, wherein this coat not on the outer surface of the outer surface of inlet-outlet sleeve (4), main bus bar sleeve pipe (9), observation window (18) and the faying face of insulating cylinder (1) and the round boss face taking M4 screwed hole as the center of circle taking 1.2cm as radius.
6. a kind of main insulation body for solid-state insulated switchgear according to claim 1, is characterized in that: described inlet-outlet sleeve (4), main bus bar sleeve pipe (9) are the European standard taper of IEC of 630A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502582.3A CN104201595B (en) | 2014-09-24 | 2014-09-24 | A kind of main insulation body for solid-state insulated switchgear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502582.3A CN104201595B (en) | 2014-09-24 | 2014-09-24 | A kind of main insulation body for solid-state insulated switchgear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104201595A true CN104201595A (en) | 2014-12-10 |
| CN104201595B CN104201595B (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410502582.3A Active CN104201595B (en) | 2014-09-24 | 2014-09-24 | A kind of main insulation body for solid-state insulated switchgear |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108364820A (en) * | 2017-12-29 | 2018-08-03 | 北京双杰电气股份有限公司 | A kind of insulating boot applied to vacuum interrupter |
| CN109244987A (en) * | 2018-10-10 | 2019-01-18 | 珠海许继电气有限公司 | A kind of outlet casing tube with isolation baffle plate |
| CN109449813A (en) * | 2018-12-28 | 2019-03-08 | 南通苏源恒炫电气有限公司 | A kind of highland and severe cold type solid-state insulated switchgear |
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| CN204068009U (en) * | 2014-09-24 | 2014-12-31 | 吉林省金冠电气股份有限公司 | A kind of main insulation body for solid-state insulated switchgear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108364820A (en) * | 2017-12-29 | 2018-08-03 | 北京双杰电气股份有限公司 | A kind of insulating boot applied to vacuum interrupter |
| CN109244987A (en) * | 2018-10-10 | 2019-01-18 | 珠海许继电气有限公司 | A kind of outlet casing tube with isolation baffle plate |
| CN109449813A (en) * | 2018-12-28 | 2019-03-08 | 南通苏源恒炫电气有限公司 | A kind of highland and severe cold type solid-state insulated switchgear |
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| Publication number | Publication date |
|---|---|
| CN104201595B (en) | 2016-04-20 |
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Denomination of invention: A main insulator for solid insulation switchgear Effective date of registration: 20220624 Granted publication date: 20160420 Pledgee: China Construction Bank Corporation Changchun Shuangyang sub branch Pledgor: JILIN JINGUAN ELECTRIC Co.,Ltd. Registration number: Y2022220000021 |
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