CN2919481Y - 765kV electromagnetic standard voltage mutual inductor with single stage structure - Google Patents
765kV electromagnetic standard voltage mutual inductor with single stage structure Download PDFInfo
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- CN2919481Y CN2919481Y CN 200620097237 CN200620097237U CN2919481Y CN 2919481 Y CN2919481 Y CN 2919481Y CN 200620097237 CN200620097237 CN 200620097237 CN 200620097237 U CN200620097237 U CN 200620097237U CN 2919481 Y CN2919481 Y CN 2919481Y
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Abstract
The utility model relates to a standard of the work frequency proportion, is a standard voltage transformer used in laboratory single class structure 765kV electromagnetism style, adopting sulphur hexafluoride gas insulation structure, comprising an outer equal pressing ring, a high voltage bushing and a metal tank. The transformer is provided in the metal tank. The transformer two times winding is adopting unequal density fabric mode. The first time winging is appearing tower structure winding them to make, then the width gradually shrunk from the most inner layer to the outer layer, and between the layers have insulation layer of polyester film. The utility model measure uncertainty degree is better than 3x10 <5>, two time winding is in the range of 0-1 VA standard level that can meet 0.01class requirements. The charge of electromagnetism interference and environment affect to the error curvilinear is less than 1x10 <-6>, has excellent anti-magnetic field interference capability. The utility model can be used for work frequency voltage proportion standard quantum transfer and quantum trace, and can be used as standard voltage transformer for 765kV electric power transformer routine test for the product factory leaving, and transformer substation at site test, and also can be used for 765kV work frequency transformer, lightning arrester and for the test and adjustment of other equipment and devices.
Description
Technical field
The utility model belongs to the high pressure measurement testing equipment, relate to the power-frequency voltage ratio standard, relate in particular to a kind of single step arrangement 765kV electromagnetic type standard potential transformer that is used to measure the 750kV electric pressure, this is a kind of measurement instrument of scaling transformation power-frequency voltage size, can be used for the transmission of quantity value and the magnitude tracing of power-frequency voltage ratio.
Background technology
Raising along with the line voltage grade, the power-frequency voltage ratio standard that relates to the more voltage levels of association areas such as electric weight trade settlement, Electrical Power Technology research, power equipment manufacturing and test improves thereupon, need carry out the power-frequency voltage transmission of quantity value and the magnitude tracing of corresponding more voltage levels.The eighties in last century, China's 500kV electrical network begins to speed up the construction, and the research work of 500kV power-frequency voltage ratio standard is also carried out synchronously.Under the unremitting effort of more than two decades of numerous scientific and technical personnel's process, national high voltage measuring station in 2002 and Taikai Electric Group Co., Ltd. have developed China's first 500kV electromagnetic type standard potential transformer jointly, its good stability, use are reliably, temperature influence is less, and uncertainty of measurement is less than 2 * 10
-5, reached international most advanced level, solve China 500kV and exchanged the power-frequency voltage ratio transmission of quantity value in supertension line and the power science association area and the relevant difficult problem of magnitude tracing.05 year NORTHWEST CHINA has been built up article one 750kV and has been exchanged the superhigh pressure test circuit, all will increase a 750kV supertension line every year newly during the 11th Five-Year, and the 750kV circuit is related to accuracy, the line loss assessment reliability of electric energy trade settlement with the accuracy of voltage transformer; The reliability of a large amount of scientific research data of the power science association area research of 750kV electric pressure is also relevant with the accurate measurement of power-frequency voltage with accuracy.The power-frequency voltage ratio transmission of quantity value of 750kV circuit and magnitude tracing are badly in need of solving, and develop its nucleus equipment---and the 765kV standard potential transformer is to carry out the power-frequency voltage ratio transmission of quantity value of 750kV circuit and the material base of magnitude tracing work.But China does not also set up the power-frequency voltage ratio standard of 750kV electric pressure at present, can not satisfy the needs of northwest 750kV circuit power frequency voltage ratio standard transmission of quantity value and magnitude tracing.
Summary of the invention
The purpose of this utility model is to carry out the material preparation for setting up China 765kV power-frequency voltage ratio standard, so that carry out the transmission of quantity value and the magnitude tracing work of 750kV electrical network, for China 750kV electrical network electric energy metrical, line loss accurate measurement lay the foundation, provide a kind of laboratory single step arrangement 765kV electromagnetic type standard potential transformer.
The technical solution of the utility model is, a kind of single step arrangement 765kV electromagnetic type standard potential transformer, adopt the sulfur hexafluoride gas-insulating structure, by outer grading ring 1, bushing 16, metal can 18 is formed, instrument transformer device body 10 is arranged in the metal can 18 and be fixed on the base plate in the metal can 18, bushing 16 upper ends are terminal block 2 once, outer grading ring 1 is fixed on the primary connection plate 2, the top of bushing 16 is tightly connected by O RunddichtringO 3 and primary connection plate 2, bushing 16 bottoms by flange 8 and O RunddichtringO 3 sealing and fixing on metal can 18, metal can 18 is outer to be equipped with lifting with hoisting ring 17 and be provided with sulfur hexafluoride gas pressure vacuum meter 19, it is characterized in that: the caliber scope of outer grading ring 1 is 160～260mm, diameter range is 1400～1800mm, the height of bushing 16 is 4800 ± 5mm, internal diameter is 600 ± 5mm, and metal can 18 is 6～8mm for its thickness range of pressure vessel; Instrument transformer device body 10 by folder support 11, winding 20, secondary winding 21, unshakable in one's determination 12 and high-tension shielding cover 14 forms, winding 20 is outside secondary winding 21 and altogether on iron core 12, high-tension shielding cover 14 covers on outside winding 20; The wire laying mode that secondary winding 21 adopts density not wait, one time winding 20 is the pyramidal structure coiling, shrink gradually to the outermost layer width from innermost layer, and interlayer has a glue polyester film insulating barrier 22, the electrostatic screen layer 23 that useful sheet copper rolls between winding 20 and the secondary winding 21 is fixed the relative position of first and second winding 20,21 and unshakable in one's determination 12 in the error debugging back that finishes with epoxide-resin glue; The high-voltage connection of winding 20 HV Terminal and bushing 16 is flexible coupling, and secondary winding 21 lead-out wires are introduced in the secondary connection boxes 13 through metal can 18, and the terminal for terminal block is arranged in the secondary connection box 13.
Single step arrangement 765kV electromagnetic type standard potential transformer from the above mentioned, wherein bushing 16 is made up of shielded-plate tube 4, disc insulator 5, intershield tube 6, grounding electrode shielding tube 7 and silicon rubber compound insulating sleeve 15, high-voltage connection once in the shielded-plate tube 4, disc insulator 5 connects intershield tube 6 and shielded-plate tube 7, shielded-plate tube 4, intershield tube 5 and grounding electrode shielding tube 7 three layers of coaxial shielding tube of composition and its length are respectively 4800 ± 5mm, 1900 ± 5mm, 750 ± 5mm, and its diameter is respectively 90 ± 5mm, 320 ± 5mm, 540 ± 5mm.
Single step arrangement 765kV electromagnetic type standard potential transformer from the above mentioned, the high-voltage connection of its winding 20 HV Terminal and bushing 16 is flexible coupling, and is to adopt high pressure line spring 9 to connect.
Of the present utility model unshakable in one's determination 12 is to select the close saturation point height of magnetic, high-quality silicon steel sheet that iron-loss per unit weight is little for use, and the electrical steel sheet adopts about 45 ° the seam connected mode of cutting sth. askew.
The utility model is a laboratory single step arrangement 765kV electromagnetic type standard potential transformer, the insulation level height, 1 minute short duration power frequency withstand voltage reaches 1.7 times of 765kV standard potential transformer rated voltage, 20%～120% rated voltage good linearity, and uncertainty of measurement is better than 3 * 10
-5, upper limit measuring range can reach 150% of rated voltage, can satisfy no-load voltage ratio 765/ √ 3kV/100/ √ 3V voltage of power instrument transformer protected level winding error measure; The error curve long-time stability are good; Secondary winding can satisfy 0.01 grade standard voltage transformer requirement at 0VA～1VA scope class of accuracy; Under 750kV transformer station condition, use, the interference of electromagnetic field and variation of ambient temperature to the amount of influence of error curve less than 1 * 10
-6, have high anti-electromagnetic field interference performance.
Description of drawings
Fig. 1 the utility model structure chart
The winding and the core construction schematic diagram of Fig. 2 the utility model instrument transformer device body 4
Fig. 3 the utility model circuit theory diagrams
1 outer grading ring, 2 primary connection plates, the 3O RunddichtringO, 4 shielded-plate tubes, 5 disc insulators, 6 intershield tubes, 7 grounding electrodes shielding tube, 8 flanges, 9 high pressure line springs, 10 instrument transformer device bodies, 11 folder supports, 12 iron cores, 13 secondary connection boxes, 14 high-tension shielding covers, 15 silicon rubber compound insulating sleeves, 16 bushings, 17 hoisting rings, 18 metal cans, 19 gas pressure vacuum meters, 20 windings, 21 secondary winding, 22 glue polyester film insulating barriers, 23 electrostatic screen layers
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is the utility model structure chart, a kind of single step arrangement 765kV electromagnetic type standard potential transformer, adopted the sulfur hexafluoride gas-insulating structure to improve insulation level, form by outer grading ring 1, bushing 16, metal can 18, have in the metal can 18 on instrument transformer device body 10 and the firm base plate that is installed in the metal can 18, make standard potential transformer transport and move in the process, relative position between winding, secondary winding and an iron core is constant, guarantee that its characteristic parameter is constant, error characteristics can remain unchanged for a long time; Bushing 16 upper ends are terminal block 2 once, outer grading ring 1 is used to improve discharge inception voltage all pressure effects, it is fixed on the primary connection plate 2, the top of bushing 16 is tightly connected by O RunddichtringO 3 and primary connection plate 2, bushing 16 bottoms by flange 8 and O RunddichtringO 3 sealing and fixing on metal can 18, metal can 18 is outer to be equipped with lifting with hoisting ring 17 and be provided with sulfur hexafluoride gas pressure vacuum meter 19, and the caliber of outer grading ring 1 is that 260mm, diameter are 1800mm; The height of bushing 16 is that 4800mm, internal diameter are 600mm, and metal can 18 is 8mm for its thickness of pressure vessel, and inside is filled with the good dielectric of insulation property---SF
6Gas, the height of bushing and instrument transformer device body place the sealing metal tank body of wall thickness 8mm, to guarantee that the external electromagnetic field infiltration amount of influence is less than 1/20th of 0.01 grade standard voltage transformer error restriction.
Instrument transformer device body 10 is by folder support 11, a winding 20, secondary winding 21, iron core 12 and high-tension shielding cover 14 are formed, Fig. 2 is the winding and the core construction schematic diagram of the utility model instrument transformer device body 10, Fig. 3 is the utility model circuit theory diagrams, in Fig. 2 and Fig. 3, a winding 20 is outside secondary winding 21 and altogether on unshakable in one's determination 12, winding 20 outsides are equipped with all presses high-tension shielding cover 14, the design consideration electric Field Calculation structure of shielding curvature is determined, adopt the rotary pressing processing mode to be shaped simultaneously, guarantee that surface roughness meets the demands, improve electrode screening surface work function; The utility model adopts the relative position of winding of change and secondary winding, the wire laying mode that secondary winding 21 adopts density not wait, mainly be change the width layout of secondary winding and secondary winding wiring sparse, make full use of the capacitive current compensation effect of stray capacitance between winding layers, reach the effect of adjusting the standard potential transformer phase angle; Adopt and adjust a umber of turn, adjust the ratio of standard potential transformer.One sub-high pressure winding 20 is the pyramidal structure coiling and distributes with the voltage of shim coil with periphery, shrink gradually to the outermost layer width from innermost layer, one time winding divides multistage place mat interlayer dielectic (promptly putting glue polyester film insulating barrier 22) to improve the service efficiency of interlayer dielectic, utilize layer insulation and a winding turriform to distribute, can reduce the winding height one time, effectively utilize the space, make the core material materials be reduced to minimum degree, thereby reduce the whole active loss of standard potential transformer, reduce the leakage reactance between winding and secondary winding, can reduce the compensation rate of standard potential transformer phase angle difference, improve the linearity and the load-bearing capacity of error curve; Adopt some glue polyester film as a winding layer insulation, after high-temperature process is solidified, guarantee the stability of standard potential transformer error characteristics; That useful sheet copper rolls between winding 20 and secondary winding 21 but electrostatic screen layer 23 that can not short circuit is used to stop between two windings to produce by distributed capacitance intercouple, and improves the linearity of the utility model error curve; After finishing, the error debugging fixes the relative position of first and second winding 20,21 and unshakable in one's determination 12 with epoxide-resin glue.
Bushing 16 is made up of shielded-plate tube 4, disc insulator 5, intershield tube 6, grounding electrode shielding tube 7 and silicon rubber compound insulating sleeve 15, silicon rubber compound insulating sleeve 15 plays external insulation and support, the high-intensity glass fibre reinforced plastic cylinder of silicone rubber sleeve 15 inner employings supports, the outside silicon rubber cluster parachute integral injection molding that adopts has remarkable anti-fouling flashover performance, hydrophobicity performance and good electric erosion resistance energy.High-voltage connection is at pure SF
6In the gas-insulated structure shielded-plate tube 4, disc insulator 5 connects intershield tube 6 and shielded-plate tube 4, adopt three layers of coaxial shielding tube, hang between insulation is adopted in intershield, the selection principle of length, diameter and the edge flange curvature of each shielding is to guarantee that surface electric field intensity is even everywhere, also to take into account inside pipe casing and outer Electric Field Distribution equilibrium of surveying, the shielded-plate tube 4 that we select at this, intershield tube 6 and grounding electrode shielding tube 7 three layers of coaxial shielding tube of composition and its length are respectively 4800mm, 1900mm, 750mm, and its diameter is respectively 90mm, 320mm, 540mm.
In Fig. 1, the high-voltage connection of winding 20 HV Terminal and bushing 16 is to adopt high pressure line spring 9 to be flexible coupling, and secondary winding 21 lead-out wires are introduced in the secondary connection boxes 13 through metal can 18, and the terminal for terminal block is arranged in the secondary connection box 13.Of the present utility model unshakable in one's determination 12 is high-quality silicon steel sheets that to select the close saturation point height of magnetic for use be B-H loop flex point height, iron-loss per unit weight is little, taking into account the linear requirement of the error of 765kV standard potential transformer in rated voltage 20%～120% scope in the close selection of magnetic unshakable in one's determination, make full use of the B-H loop linearity range; The electrical steel sheet adopts about 45 ° the seam connected mode of cutting sth. askew.
The utility model can be used for the transmission of quantity value and the magnitude tracing of power-frequency voltage ratio standard, also can be used as the routine test of dispatching from the factory, transformer station's field test that standard potential transformer is used for 765kV voltage of power instrument transformer; Can also be used for miscellaneous equipment and Device Testing and calibration usefulness such as 765kV power frequency voltage divider, lightning arrester.
Claims (4)
1, a kind of single step arrangement 765kV electromagnetic type standard potential transformer, adopt the sulfur hexafluoride gas-insulating structure, by outer grading ring (1), bushing (16), metal can (18) is formed, instrument transformer device body (10) is arranged in the metal can (18) and be fixed on the base plate in the metal can (18), bushing (16) upper end is terminal block (2) once, outer grading ring (1) is fixed on the primary connection plate (2), the top of bushing (16) is tightly connected by O RunddichtringO (3) and primary connection plate (2), bushing (16) bottom by flange (8) and O RunddichtringO (3) sealing and fixing on metal can (18), metal can (18) is outer to be equipped with lifting with hoisting ring (17) and be provided with sulfur hexafluoride gas pressure vacuum meter (19), it is characterized in that: the caliber scope of outer grading ring (1) is 160～260mm, diameter range is 1400～1800mm, the height of bushing (16) is 4800 ± 5mm, internal diameter is 600 ± 5mm, and metal can (18) is 6～8mm for its thickness range of pressure vessel; Instrument transformer device body (10) is made up of folder support (11), a winding (20), secondary winding (21), (12) unshakable in one's determination and high-tension shielding cover (14), outside secondary winding (21) and altogether on (12) unshakable in one's determination, high-tension shielding cover (14) covers on outside the winding (20) winding (20); The wire laying mode that secondary winding (21) adopts density not wait, a winding (20) is the pyramidal structure coiling, shrink gradually to the outermost layer width from innermost layer, and interlayer has a glue polyester film insulating barrier (22), the electrostatic screen layer (23) that useful sheet copper rolls between a winding (20) and the secondary winding (21) is debugged first and second winding (20,21) and (12) unshakable in one's determination are fixed in the back that finishes with epoxide-resin glue relative position in error; The high-voltage connection of winding (20) HV Terminal and bushing (16) is flexible coupling, and secondary winding (21) lead-out wire has the terminal for terminal block in the secondary connection box (13) in metal can (18) is introduced secondary connection box (13).
2, single step arrangement 765kV electromagnetic type standard potential transformer as claimed in claim 1, it is characterized in that: bushing (16) is by shielded-plate tube (4), disc insulator (5), intershield tube (6), grounding electrode shielding tube (7) and silicon rubber compound insulating sleeve (15) are formed, high-voltage connection once in the shielded-plate tube (4), disc insulator (5) connects intershield tube (6) and shielded-plate tube (4), shielded-plate tube (4), three layers of coaxial shielding tube formed by intershield tube (6) and grounding electrode shielding tube (7) and its length is respectively 4800 ± 5mm, 1900 ± 5mm, 750 ± 5mm, its diameter is respectively 90 ± 5mm, 320 ± 5mm, 540 ± 5mm.
3, single step arrangement 765kV electromagnetic type standard potential transformer as claimed in claim 2 is characterized in that: the high-voltage connection of winding (20) HV Terminal and bushing (16) is flexible coupling, and is to adopt high pressure line spring (9) to connect.
4, as claim 1 or 2 or 3 described single step arrangement 765kV electromagnetic type standard potential transformers, it is characterized in that: unshakable in one's determination (12) are to select the close saturation point height of magnetic, high-quality silicon steel sheet that iron-loss per unit weight is little for use, and the electrical steel sheet adopts about 45 ° the seam connected mode of cutting sth. askew.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620097237 CN2919481Y (en) | 2006-06-15 | 2006-06-15 | 765kV electromagnetic standard voltage mutual inductor with single stage structure |
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| CN 200620097237 CN2919481Y (en) | 2006-06-15 | 2006-06-15 | 765kV electromagnetic standard voltage mutual inductor with single stage structure |
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| CN2919481Y true CN2919481Y (en) | 2007-07-04 |
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| CN 200620097237 Expired - Lifetime CN2919481Y (en) | 2006-06-15 | 2006-06-15 | 765kV electromagnetic standard voltage mutual inductor with single stage structure |
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| CN102323562A (en) * | 2011-08-12 | 2012-01-18 | 山东泰开互感器有限公司 | Complete set of error checking device for ultrahigh/extra-high voltage capacitor voltage transformer |
| CN102800476A (en) * | 2012-08-28 | 2012-11-28 | 西安布伦帕电力无功补偿技术有限公司 | High-voltage standard capacitor |
| CN105466484A (en) * | 2015-11-16 | 2016-04-06 | 张磊 | Using method of intelligent inflatable voltage transformer |
| CN105699725A (en) * | 2014-11-24 | 2016-06-22 | 国家电网公司 | Connecting flange of equipotential shielded capacitive voltage transformer |
| CN105719816A (en) * | 2015-11-16 | 2016-06-29 | 任红霞 | Intelligent inflatable voltage transformer |
| CN107275064A (en) * | 2017-07-31 | 2017-10-20 | 武汉磐电科技股份有限公司 | 500kV standard potential transformers |
| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN107424799A (en) * | 2017-08-22 | 2017-12-01 | 常州东芝变压器有限公司 | gas-insulated transformer |
| CN108962565A (en) * | 2018-08-28 | 2018-12-07 | 山东电力设备有限公司 | A kind of bushing shell for transformer with multi-screen structure |
| CN109074949A (en) * | 2016-04-22 | 2018-12-21 | 西门子股份公司 | HG ü air choking-winding and manufacturing method |
| CN110136941A (en) * | 2019-06-19 | 2019-08-16 | 江苏科瑞电气有限公司 | A kind of standard potential transformer |
| CN110729119A (en) * | 2019-10-25 | 2020-01-24 | 中互电气(江苏)有限公司 | High-voltage mutual inductor |
| CN112666401A (en) * | 2020-12-15 | 2021-04-16 | 广东电网有限责任公司电力科学研究院 | Transformer insulating sleeve frequency domain dielectric spectrum field testing device, cavity conductor and method |
| CN113219264A (en) * | 2021-05-28 | 2021-08-06 | 清华大学 | On-site measuring device and method for surface charge of high-voltage direct-current sleeve |
| CN116053014A (en) * | 2023-02-20 | 2023-05-02 | 河南澳美电气有限公司 | Voltage transformer |
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2006
- 2006-06-15 CN CN 200620097237 patent/CN2919481Y/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102323562A (en) * | 2011-08-12 | 2012-01-18 | 山东泰开互感器有限公司 | Complete set of error checking device for ultrahigh/extra-high voltage capacitor voltage transformer |
| CN102800476A (en) * | 2012-08-28 | 2012-11-28 | 西安布伦帕电力无功补偿技术有限公司 | High-voltage standard capacitor |
| CN102800476B (en) * | 2012-08-28 | 2015-07-08 | 西安布伦帕电力无功补偿技术有限公司 | High-voltage standard capacitor |
| CN105699725A (en) * | 2014-11-24 | 2016-06-22 | 国家电网公司 | Connecting flange of equipotential shielded capacitive voltage transformer |
| CN105466484A (en) * | 2015-11-16 | 2016-04-06 | 张磊 | Using method of intelligent inflatable voltage transformer |
| CN105719816A (en) * | 2015-11-16 | 2016-06-29 | 任红霞 | Intelligent inflatable voltage transformer |
| CN109074949A (en) * | 2016-04-22 | 2018-12-21 | 西门子股份公司 | HG ü air choking-winding and manufacturing method |
| CN109074949B (en) * | 2016-04-22 | 2022-02-18 | 西门子股份公司 | HG Lu air choke coil and manufacturing method |
| US11562853B2 (en) | 2016-04-22 | 2023-01-24 | Siemens Energy Global GmbH & Co. KG | High voltage direct current energy transmission (HVDCT) air-core inductor, and method for manufacturing the HVDCT air-core inductor |
| CN107275064A (en) * | 2017-07-31 | 2017-10-20 | 武汉磐电科技股份有限公司 | 500kV standard potential transformers |
| CN107424799A (en) * | 2017-08-22 | 2017-12-01 | 常州东芝变压器有限公司 | gas-insulated transformer |
| CN107424799B (en) * | 2017-08-22 | 2023-06-30 | 常州东芝变压器有限公司 | Gas-insulated transformer |
| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN107369544B (en) * | 2017-09-04 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | GIS type self-boosting standard voltage transformer with electromagnetic shielding |
| CN108962565A (en) * | 2018-08-28 | 2018-12-07 | 山东电力设备有限公司 | A kind of bushing shell for transformer with multi-screen structure |
| CN110136941A (en) * | 2019-06-19 | 2019-08-16 | 江苏科瑞电气有限公司 | A kind of standard potential transformer |
| CN110729119A (en) * | 2019-10-25 | 2020-01-24 | 中互电气(江苏)有限公司 | High-voltage mutual inductor |
| CN110729119B (en) * | 2019-10-25 | 2020-12-04 | 中互电气(江苏)有限公司 | High-voltage mutual inductor |
| CN112666401A (en) * | 2020-12-15 | 2021-04-16 | 广东电网有限责任公司电力科学研究院 | Transformer insulating sleeve frequency domain dielectric spectrum field testing device, cavity conductor and method |
| CN113219264A (en) * | 2021-05-28 | 2021-08-06 | 清华大学 | On-site measuring device and method for surface charge of high-voltage direct-current sleeve |
| CN113219264B (en) * | 2021-05-28 | 2023-10-27 | 清华大学 | On-site measurement device and method for surface charge of high-voltage direct-current sleeve |
| CN116053014A (en) * | 2023-02-20 | 2023-05-02 | 河南澳美电气有限公司 | Voltage transformer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE Effective date: 20091016 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091016 Address after: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Co-patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: Power Science Research Institute of national network Address before: Hubei city of Wuhan province Wuchang Luo Yu Road, No. 143, zip code: 430071 Patentee before: Wuhan High Voltage Inst. |
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| CX01 | Expiry of patent term |
Granted publication date: 20070704 |
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| EXPY | Termination of patent right or utility model |