CN102253317B - High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method - Google Patents
High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method Download PDFInfo
- Publication number
- CN102253317B CN102253317B CN 201110108141 CN201110108141A CN102253317B CN 102253317 B CN102253317 B CN 102253317B CN 201110108141 CN201110108141 CN 201110108141 CN 201110108141 A CN201110108141 A CN 201110108141A CN 102253317 B CN102253317 B CN 102253317B
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- direct current
- impulse
- terminal
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 43
- 230000001681 protective effect Effects 0.000 claims description 19
- 230000003116 impacting effect Effects 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 claims 1
- 238000009422 external insulation Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000011160 research Methods 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
A high-altitude power transmission grade alternating current, direct current and impulse combined superimposed voltage test method is characterized in that an alternating current power supply device (1), a direct current power supply device (2) and an impulse power supply device (3) are combined and superimposed to operate in an area with an altitude of 1800-2200 m, under the working condition of alternating current, direct current and impulse combined superimposed voltage test, the alternating current power supply device outputs 0-900 kV power frequency voltage, the direct current power supply device outputs 0- +/-1200 kV direct current voltage, and the impulse power supply device outputs the highest 3.5MV standard lightning impulse voltage or 2.5MV standard operation impulse voltage, so that the combined superimposed voltage test requirement of ultra-high voltage power transmission grade electrical equipment is met. The invention is an effective combined superimposed voltage test method for the ultra-high voltage transmission grade alternating current, direct current and impact in the high-altitude area, and has the unique advantages that the power supply can output high electrical parameter grade, the tested equipment can bear superimposed tests and combined tests, and the equivalent external insulation of the high-altitude area where the test is located is examined rigorously.
Description
Technical field
The invention belongs to electric system High-Voltage Technology field, be particularly useful for high altitude localities UHV transmission grade and following electrical equipment separately, associating or the test of stack external insulation withstand voltage.
Background technology
Become a reality in China as the highest interchange 1000kV of the electric pressure of having put into commercial operation in the world, direct current ± 800kV system for ultra-high voltage transmission.Owing to be combined with the commercial off-the-shelf actual demand, research, exploitation, application and the deeper theoretical property of relevant extra-high voltage grade transmission facility, basic and supportive research contents and direction are leading worldwide trend and trend basically.
Because vast in territory, the energy skewness of China, UHV (ultra-high voltage) and system for ultra-high voltage transmission are characteristics with remote, big capacity, the conveying of the point-to-point energy, the regional feature difference of approach along the line is obvious, except the big discrepancy in elevation, height above sea level difference obviously, environment, weather, temperature and humidity etc. have very obvious even antipodal feature.
For the electrical equipment in the operation of UHV transmission grade, unavoidable necessary in the face of normal working voltage, lightning impulse voltage and operating impulse voltage.Because its basic normal working voltage improves greatly, thunder and lightning and operating impulse voltage abnormal conditions may occur to its overlaying influence.The height above sea level factor is obvious for the effect characteristics of electrical apparatus external insulation in addition.
Unite in the stack experimental study in existing interchange, direct current and surge voltage, low-voltage grade and low altitude area are its main characteristics the most, in addition because arrangement and the site requirements of power-supply device, never see on the basis of alternating current-direct current combined voltage test again and to exchange or DC voltage is born side superpose research mode and the correlative study content of a surge voltage.
Based on external insulation research characteristics and the demand of UHV transmission grade electrical equipment, in conjunction with the influence of height above sea level factor, the present invention proposes a kind of for high altitude localities UHV transmission grade interchange, direct current, combined impulse repeated addition voltage test method.
Summary of the invention
The objective of the invention is to solve the deficiencies in the prior art; satisfy the external insulation demand of UHV transmission grade electrical equipment; provide high height above sea level transmission of electricity grade to exchange; direct current; combined impulse repeated addition voltage test method; ac test power-supply device with UHV transmission grade insulation of electrical installation research institute need; DC experiment power supply equipment and impulse test power-supply device combine; by set up protective resistance and protection ball crack at power outlet; the reasonable Arrangement of all kinds of experiment power supply equipment and the effect characteristics of considering actual high height above sea level realize that the complete high altitude localities of UHV transmission grade and following all types of electrical equipment exchanges; direct current and combined impulse repeated addition voltage test ability.
The objective of the invention is to be achieved through the following technical solutions.
High height above sea level transmission of electricity grade exchanges, direct current, combined impulse repeated addition voltage test method, this method is for adopting ac power supply apparatus, continuous-current plant, impact supply unit and unite stack, run on height above sea level 1800 ~ 2200m area, exchanging, direct current, under the combined impulse repeated addition voltage test operating mode, ac power supply apparatus output 0～900kV power-frequency voltage, continuous-current plant output 0～± the 1200kV DC voltage, impact the supply unit the highest 3.5MV standard lightning impulse voltage of output or 2.5MV standard switching impulse voltage, satisfy the associating repeated addition voltage test demand of UHV transmission grade electrical equipment; It is as follows that ac power supply apparatus, continuous-current plant, impact supply unit are united the voltage test methods of stack:
A. alternating voltage and DC voltage act on respectively on the first terminal and second terminal of tested device and ground insulation by first protective resistance of ac power supply apparatus outlet and second protective resistance of continuous-current plant respectively;
B. alternating voltage and surge voltage first protective resistance by ac power supply apparatus outlet and the protection ball crack of impacting the supply unit outlet act on the same terminal that tested device and ground insulate respectively, namely act on the first terminal or on second terminal;
C. DC voltage and surge voltage second protective resistance by continuous-current plant outlet and the protection ball crack of impacting the supply unit outlet act on the same terminal that tested device and ground insulate, and namely act on the first terminal or on second terminal;
D. in alternating voltage and DC voltage when second protective resistance of first protective resistance by the ac power supply apparatus outlet and continuous-current plant acts on the first terminal of tested device and ground insulation and second terminal respectively respectively, surge voltage acts on the first terminal or second terminal of the tested device that applies interchange or DC voltage by the protection ball crack of impacting the supply unit outlet.
The invention has the beneficial effects as follows: have the exportable electric parameter grade of power supply height, tested device and can bear distinct advantages such as stack test and Combined Trials, the examination of test high altitude localities equivalence of living in external insulation be harsh.
Further set forth content of the present invention below in conjunction with accompanying drawing and example.
Description of drawings
Fig. 1 is AC power, direct supply associating applied voltage test wiring schematic diagram;
Fig. 2 is for impacting power supply, AC power stack test connection synoptic diagram;
Fig. 3 is for impacting power supply, direct supply stack test connection synoptic diagram;
Fig. 4 is that AC power and direct supply are united pressurization, impacted the test connection synoptic diagram that power supply is superimposed upon the AC power application point simultaneously;
Fig. 5 is that AC power and direct supply are united pressurization, impacted the test connection synoptic diagram that power supply is superimposed upon the direct supply application point simultaneously.
Embodiment
High height above sea level transmission of electricity grade exchanges, direct current, combined impulse repeated addition voltage test method, this method is for adopting ac power supply apparatus 1, continuous-current plant 2, impact supply unit 3 and unite stack, run on height above sea level 1800 ~ 2200m area, exchanging, direct current, under the combined impulse repeated addition voltage test operating mode, ac power supply apparatus 1 output 0～900kV power-frequency voltage, continuous-current plant 2 outputs 0～± the 1200kV DC voltage, impact the supply unit 3 the highest 3.5MV standard lightning impulse voltage of output or 2.5MV standard switching impulse voltages, satisfy the associating repeated addition voltage test demand of UHV transmission grade electrical equipment; Ac power supply apparatus 1, continuous-current plant 2), impacting supply unit 3, to unite the voltage test methods of stack as follows:
A. alternating voltage and DC voltage act on respectively on the first terminal 7 and second terminal 8 of tested device 6 and ground insulation by first protective resistance 4 of ac power supply apparatus 1 outlet and second protective resistance 5 of continuous-current plant 2 respectively;
B. alternating voltage and surge voltage first protective resistance 4 by ac power supply apparatus 1 outlet and the protection ball crack 9 of impacting supply unit 3 outlets act on the same terminal of tested device 6 and ground insulation respectively, namely act on the first terminal 7 or on second terminal 8;
C. DC voltage and surge voltage second protective resistance 5 by continuous-current plant 2 outlet and the protection ball crack 9 of impacting supply unit 3 outlets act on the same terminal of tested device 6 and ground insulation, namely act on the first terminal 7 or on second terminal 8;
D. in alternating voltage and DC voltage when second protective resistance 5 of first protective resistance 4 by ac power supply apparatus 1 outlet and continuous-current plant 2 acts on the first terminal 7 of tested device 6 and ground insulation and second terminal 8 respectively respectively, surge voltage by the protection ball crack 9 of impacting supply unit 3 outlets act on apply exchange or the first terminal 7 or second terminal 8 of the tested device 6 of DC voltage on.
See Fig. 1, the figure shows AC power and direct supply associating applied voltage test wiring schematic diagram.Ac power supply apparatus 1 is made of testing transformer 10, power protection resistance 11 and capacitive divider 12 among the figure.Continuous-current plant 2 is made of charge power supply and DC voltage generator body 13, power protection resistance 14, resitstance voltage divider 15 and grounding switch 16.When test specimen 6; as AC filter and breaker; be when needing the certain alternating voltage of examination tolerance respectively and DC voltage on the first terminal 7, second terminal 8 with the different terminals of ground insulation; by resistance 2 ~ 10M Ω, the i.e. self-shield of first protective resistance 4, second protective resistance 5 of length 3～5m water resistance that is constituted by insulating material cylindrical tube water-filling, can realize AC power and the direct supply associating applied voltage test of test specimen 6.
See Fig. 2, the figure shows and impact power supply and AC power stack test connection synoptic diagram.Impacting supply unit 3 equivalences among the figure is made of the wave front resistance 19 of charging capacitor 17, synchronous discharge ball crack 18, control discharge waveform, wave rear resistance 20 and the underdamping capacitive divider 21 of control discharge waveform.Ac power supply apparatus 1 is made of testing transformer 10, power protection resistance 11 and capacitive divider 12.When test specimen 6; as AC filter and breaker; the same terminal that insulate with ground is when needing the certain surge voltage of stack examination tolerance and alternating voltage on the first terminal 7 or second terminal 8; the i.e. self-shield of 4 pairs of ac power supply apparatus 1 of first protective resistance of water resistance by the resistance 2 ~ 10M Ω, the length 3～5m that are constituted by insulating material cylindrical tube water-filling; the self-shield of the adjustable distance copper ball gap impact supply unit 3 by being not less than 1m by diameter can realize impact power supply and the AC power repeated addition voltage test of test specimen 6.
See Fig. 3, the figure shows and impact power supply and direct supply stack test connection synoptic diagram.Impacting supply unit 3 equivalences among the figure is made of the wave front resistance 19 of charging capacitor 17, synchronous discharge ball crack 18, control discharge waveform, wave rear resistance 20 and the underdamping capacitive divider 21 of control discharge waveform.Continuous-current plant 2 is made of charge power supply and DC voltage generator body 13, power protection resistance 14, resitstance voltage divider 15 and grounding switch 16.When test specimen 6; as AC filter and breaker; the same terminal that insulate with ground is when needing the certain surge voltage of stack examination tolerance and DC voltage on the first terminal 7 or second terminal 8; the i.e. self-shield of 5 pairs of continuous-current plants 2 of second protective resistance of water resistance by the resistance 2 ~ 10M Ω, the length 3～5m that are constituted by insulating material cylindrical tube water-filling; the self-shield of the adjustable distance copper ball gap impact supply unit 3 by being not less than 1m by diameter can realize impact power supply and the direct supply repeated addition voltage test of test specimen 6.
See Fig. 4, the figure shows AC power and direct supply and unite pressurization, impact the test connection synoptic diagram that power supply is superimposed upon the AC power application point.Bear AC power and direct supply is united in the process of pressurization at test specimen 6, can add protection sphere gap 9 and realize bearing a little namely to the test specimen alternating voltage surge voltage of second terminal 8 superposes by impacting supply unit 3.
See Fig. 5, the figure shows AC power and direct supply and unite pressurization, impact the test connection synoptic diagram that power supply is superimposed upon the direct supply application point.Bear AC power and direct supply is united in the process of pressurization at test specimen 6, can to add that protection sphere gap 9 realizes the test specimen DC voltage is born a little be that the surge voltage of the first terminal 7 superposes by impacting supply unit 3.
Claims (1)
1. high height above sea level transmission of electricity grade exchanges, direct current, combined impulse repeated addition voltage test method, it is characterized in that, this method is for adopting ac power supply apparatus (1), continuous-current plant (2), impact supply unit (3) and unite stack, run on height above sea level 1800m～2200m area, exchanging, direct current, under the combined impulse repeated addition voltage test operating mode, ac power supply apparatus (1) output 0～900kV power-frequency voltage, continuous-current plant (2) output 0～± the 1200kV DC voltage, impact the highest 3.5MV standard thunderbolt voltage of supply unit (3) output or 2.5MV standard switching impulse voltage, satisfy the associating repeated addition voltage test demand of UHV transmission grade electrical equipment; Ac power supply apparatus (1), continuous-current plant (2), impacting supply unit (3), to unite the voltage test methods of stack as follows:
When second protective resistance (5) of first protective resistance (4) by ac power supply apparatus (1) outlet and continuous-current plant (2) acted on the first terminal (7) of tested device (6) and ground insulation and second terminal (8) respectively and goes up respectively, the protection ball crack (9) that surge voltage exports by impact supply unit (3) acted on the first terminal (7) or second terminal (8) of the tested device (6) that applies interchange or DC voltage in alternating voltage and DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110108141 CN102253317B (en) | 2011-04-28 | 2011-04-28 | High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110108141 CN102253317B (en) | 2011-04-28 | 2011-04-28 | High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102253317A CN102253317A (en) | 2011-11-23 |
| CN102253317B true CN102253317B (en) | 2013-08-14 |
Family
ID=44980687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110108141 Active CN102253317B (en) | 2011-04-28 | 2011-04-28 | High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102253317B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721907A (en) * | 2012-06-13 | 2012-10-10 | 南方电网科学研究院有限责任公司 | Method for power frequency and impulse superposition voltage test in high-altitude area |
| CN103344892A (en) * | 2013-07-12 | 2013-10-09 | 南方电网科学研究院有限责任公司 | Combined voltage test system for direct current and impact in high-altitude area |
| CN104569749A (en) * | 2014-12-10 | 2015-04-29 | 华南理工大学 | Method for judging high altitude long air gap lightning flashover |
| CN105572548A (en) * | 2015-12-14 | 2016-05-11 | 清华大学深圳研究生院 | Measurement system and method of steamer discharge of non-uniform field |
| CN105589019A (en) * | 2016-01-25 | 2016-05-18 | 西安交通大学 | Study of SF under AC superimposed impulse voltage6Gas discharge characteristic method and apparatus |
| CN106383301B (en) * | 2016-09-30 | 2023-02-24 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Wiring loop of double-fracture circuit breaker direct-current steady-state voltage distribution and testing method |
| CN106872862A (en) * | 2017-01-05 | 2017-06-20 | 中国电力科学研究院 | A kind of apparatus and method of the alternating current-direct current composite voltage flashover test for optical fiber |
| CN106908721A (en) * | 2017-04-18 | 2017-06-30 | 中国南方电网有限责任公司电网技术研究中心 | A kind of gas-insulated switchgear experimental rig and method |
| CN107329059A (en) * | 2017-07-19 | 2017-11-07 | 西安交通大学 | Device and method for detecting superimposed voltage of free conductive particles in GIS |
| CN108169640A (en) * | 2017-12-29 | 2018-06-15 | 中国电力科学研究院有限公司 | One kind is based on gas isolated combined high-voltage generating means and method |
| CN108535610A (en) * | 2018-03-27 | 2018-09-14 | 哈尔滨理工大学 | A kind of experimental rig of transformer oil paper insulation void defects electric discharge research |
| CN108845235A (en) * | 2018-07-17 | 2018-11-20 | 南瑞集团有限公司 | A kind of high voltage direct current superposition impulse voltage test protection device |
| CN110146794A (en) * | 2019-05-28 | 2019-08-20 | 国网江苏省电力有限公司电力科学研究院 | Multivoltage is superimposed lower GIS/GIL pressure resistance and partial discharge test method and device |
| CN112666434B (en) * | 2020-11-23 | 2023-12-05 | 中国电力科学研究院有限公司 | Parameter determination method and system of extra-high voltage direct current cable superposition impact test device |
| CN112710936A (en) * | 2020-12-02 | 2021-04-27 | 平高集团有限公司 | AC/DC discharge breakdown test system and test method |
| CN116699346A (en) * | 2023-08-08 | 2023-09-05 | 西安高压电器研究院股份有限公司 | Power frequency withstand voltage test loop and power frequency withstand voltage test method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324651A (en) * | 2008-07-28 | 2008-12-17 | 青海电力科学试验研究院 | Mobile on-site impact pressure-proof test apparatus and method of 750 V voltage grading GIS equipment |
| CN101452059A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | Impulse voltage endurance test method |
| CN101937057A (en) * | 2010-08-30 | 2011-01-05 | 中国西电电气股份有限公司 | Synthesis loop for running test of converter valve for direct current power transmission project |
-
2011
- 2011-04-28 CN CN 201110108141 patent/CN102253317B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452059A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | Impulse voltage endurance test method |
| CN101324651A (en) * | 2008-07-28 | 2008-12-17 | 青海电力科学试验研究院 | Mobile on-site impact pressure-proof test apparatus and method of 750 V voltage grading GIS equipment |
| CN101937057A (en) * | 2010-08-30 | 2011-01-05 | 中国西电电气股份有限公司 | Synthesis loop for running test of converter valve for direct current power transmission project |
Non-Patent Citations (8)
| Title |
|---|
| XLPE绝缘电力电缆在交流电压下叠加冲击电压时的绝缘特性;Y.Murata等;《电线电缆》;19981231(第6期);第16-17页 * |
| Y.Murata等.XLPE绝缘电力电缆在交流电压下叠加冲击电压时的绝缘特性.《电线电缆》.1998,(第6期),第16-17页. |
| 孟峥峥，钟磊，吕亮，顾朝敏，李彦明.断路器联合加压试验的建模与仿真.《高压电器》.2010,第4卷(第1期),第32-33页. * |
| 廖蔚明,崔国华,孙昭英,李成榕.±800KV直流线路杆塔塔头空气间隙的直流叠加操作冲击放电特性.《电网技术》.2008,第32卷(第9期),第7页. * |
| 无.绝缘复合电压试验.《中国电力》.2009,第42卷(第10期),第32页. |
| 特高压交流断路器断口联合加压试验方法研究;王森等;《陕西电力》;20101231(第12期);第19-23页 * |
| 王森等.特高压交流断路器断口联合加压试验方法研究.《陕西电力》.2010,(第12期),第19-23页. |
| 绝缘复合电压试验;无;《中国电力》;20091231;第42卷(第10期);第32页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102253317A (en) | 2011-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102253317B (en) | High-altitude power transmission grade alternating current, direct current and impact combined superimposed voltage test method | |
| Liu et al. | Survey of technologies of line commutated converter based high voltage direct current transmission in China | |
| CN102721907A (en) | Method for power frequency and impulse superposition voltage test in high-altitude area | |
| CN103344821A (en) | Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor | |
| CN102135595A (en) | Device for high-altitude area direct current and impact superposition voltage test | |
| CN203054010U (en) | A multipurpose apparatus for fixing a sensor used for measuring the partial discharge of a GIS | |
| CN204116477U (en) | A kind of high-voltage reactive load test platform | |
| CN202422558U (en) | High and low voltage controller on practical training field | |
| Liao et al. | Long front time switching impulse tests of long air gap in UHV projects at altitude of 2100 m | |
| CN102707172B (en) | Test device for simulating icing of power transmission line | |
| CN105743075B (en) | The single-phase arc grounding analogue means of power distribution network | |
| CN204030286U (en) | Outdoor reactive power compensation comprehensive distribution box | |
| CN203278257U (en) | High-voltage direct-current power supply device with rapid polarity reversal | |
| CN202678086U (en) | High-voltage sulfur hexafluoride (SF6) gas-insulation current transformer having function of monitoring superhigh-frequency partial discharge | |
| CN103595291A (en) | On-line energy-gaining system of high-voltage series voltage compensation device | |
| CN104051972A (en) | 35 kV combined transformer used for photovoltaic power generation | |
| CN204228895U (en) | A kind of series compensation platform fast transient overvoltage simulation experiment system | |
| CN203826939U (en) | Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant | |
| CN203707073U (en) | Aging and testing device for electronic tubes | |
| CN103812086A (en) | High voltage electromotor protection system | |
| CN208904646U (en) | A kind of Transformer Substation Lightning Protection protective device | |
| CN203011964U (en) | Resonance test device | |
| CN203589484U (en) | Building power supply system | |
| CN105044486B (en) | Overvoltage computation model for new energy power station low-voltage ride-through testing system | |
| CN203883493U (en) | A structure for connecting two large-scale power generating sets with an extra high voltage outgoing wire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |