CN102104249A - Lighting-arresting equipment - Google Patents
Lighting-arresting equipment Download PDFInfo
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- CN102104249A CN102104249A CN2009102428431A CN200910242843A CN102104249A CN 102104249 A CN102104249 A CN 102104249A CN 2009102428431 A CN2009102428431 A CN 2009102428431A CN 200910242843 A CN200910242843 A CN 200910242843A CN 102104249 A CN102104249 A CN 102104249A
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 94
- 239000011787 zinc oxide Substances 0.000 claims description 47
- 238000009413 insulation Methods 0.000 claims description 19
- 238000010276 construction Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000006378 damage Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 241000272165 Charadriidae Species 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The invention discloses lighting-arresting equipment. The lighting-arresting equipment comprises a first lighting arrester, a second lighting arrester and a third lighting arrester, wherein the first lighting arrester and the second lighting arrester are connected in parallel and together connected in series with the third lighting arrester. Through the invention, construction is simpler, and lighting can be more safely arrested.
Description
Technical field
The present invention relates to the electric equipment field, in particular to a kind of lightning protection.
Background technology
Because thunder and lightning often acts on power transmission line, user's the electrical equipment and the person brought serious harm.Along with modernization, the process of IT application, maintaining sustained and rapid growth of power consumption, and State Grid Corporation of China is to the medium term planning of intelligent grid, the user requires to improve constantly to electricity consumption, Utilities Electric Co. faces the pressure of power supply quality, power supply reliability and Supply Security also increasing, and especially the security reliability to 10Kv and 400Kv overhead transmission line requires higher.According to incompletely statistics, at the spring and summer thunderstorm season, thunder and lightning reaches billions of yuans to overhead transmission line and the annual direct and indirect economic loss that causes of click destruction, and the lightning protection measures of overhead transmission line is encouraged increasingly serious test.
Lightning arrester (surgearrester) be a kind of can discharge thunder and lightning or hold concurrently can discharge power system operation overvoltage energy, the protection electrical equipment is avoided instantaneous overvoltage harm, can block afterflow again, the unlikely electrical installation that causes the system earth short circuit.Lightning arrester is connected between live wire and the ground usually, and is in parallel with protected equipment.When overvoltage value reached specified action voltage, lightning arrester moved immediately, flow through electric charge, and the over-voltage amplitude is protected apparatus insulated; After magnitude of voltage was normal, lightning arrester restored to the original state rapidly again, to guarantee system's normal power supply.
The lightning arrester of a multitude of names has surpassed hundreds of on the market of China, be divided into insulation puncture line clamping technology and lightning rod technology from physical structure.
Divide according to combining structure, the lightning arrester on the market has several several down now: gap-like: open gap, closed gap; Discharge tubing: open discharge tube sealed type discharge tube; Piezo-resistance class: monolithic, multi-disc; Suppress diode-like; Piezo-resistance/gas discharge tube composite class: simple combination, complex combination; The carborundum class.
Have and to be divided into according to its protective nature: open type lightning arrester, short-circuit type lightning arrester or switching mode, votage limit type.
Can be divided into again according to operating state (installation form): lightning arrester connected in parallel and tandem lightning arrester.
The lightning arrester that moves in electric power system at present mainly contains two types.One class is to be traditional valve-type arrester of main element with series gap and carborundum valve block; Another kind of is to be the metal oxide arrester of main element with the zinc oxide resistance sheet.What built on stilts splicing point was used in the prior art is that traditional parallel groove clamp and C type, H molded lines presss from both sides, this class wire clamp needs to have a power failure, peel off insulating barrier in installation process, increase construction working amount and difficulty of construction, the design of insulation puncture line clamping has overcome these drawbacks, directly install, need not have a power failure at splicing point, need not stripping, improved speed of application, convenience is especially obvious.The installation of tradition lightning arrester needs to have a power failure especially, brings negative effect for the stability of power supply, and reducing simultaneously increases engineering time and difficulty.
Existing technical scheme is a series gap zinc oxide arrester, because of clearance distance big-movement stability of characteristics, the shortcoming that can avoid the carborundum lightning arrester gap to bring.The gap of series gap zinc oxide arrester has been limited to whole temporary overvoltages protection and has avoided its harm in the dead band, so the shortcoming that can avoid zero-clearance zinc oxide lightning arrester to bring because of knee voltage is on the low side again.But as electric equipment itself, series gap zinc oxide arrester exists equally that valve block performance, parameter designing, insulation material, assembling are bad, seal defect and can't overall inspection etc. problem, grasp its performance condition and also seem very necessary.Therefore, must carry out integrated testability for zinc oxide arrester.
China power industry standard DL/T 596-1996 " (power equipment preventive trial rules " (hereinafter to be referred as " rules ") stipulates that clearly its pilot project is: insulation resistance; Electric current under voltage U 1mA under the direct current 1mA and the 75%U 1mA.
Owing to there is the gap, the current testing project under voltage U 1mA under the direct current 1mA and the 75%U 1mA is not suitable for gapped zinc oxide arrester.And the power-frequency discharge test is an elementary item of check gap lightning arrester electric property.Though because zinc oxide resistance sheet has high resistant good under low-voltage and current limliting, can not consider the cut-out ratio of discharging gap; But its power-frequency sparkover voltage equally can not be too high and low excessively.Too high power-frequency sparkover voltage will make impulse sparkover voltage raise, thereby influences the performance of lightning arrester.Crossing low power-frequency sparkover voltage just may cause insulation at protected equipment to tolerate and move under the switching overvoltage that do not need protection.So power-frequency sparkover voltage should have corresponding discharge voltage range according to the protection of arrester object.Wherein, conducting current test is to check whether lightning arrester inside makes moist, and parallel resistance has non-cracking, an aging important indicator.Its test connection is consistent with the wiring of FCD campaign, requires conducting current to be not more than 50 μ A.
Fail safe at lightning protection in the correlation technique is not high enough, and the bigger problem of difficulty of construction, does not propose effective solution at present as yet.
Summary of the invention
Fail safe at lightning protection in the correlation technique is not high enough, and the bigger problem of difficulty of construction and propose the present invention, and for this reason, main purpose of the present invention is to provide a kind of lightning protection, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of lightning protection.
Lightning protection according to the present invention comprises: first lightning arrester; Second lightning arrester; The 3rd lightning arrester, wherein, first lightning arrester and second lightning arrester are in parallel, this two be in series with the 3rd lightning arrester together.
Preferably, first lightning arrester is the clearance type lightning arrester; Second lightning arrester is a zinc oxide arrester; The 3rd lightning arrester is a zinc oxide arrester.
Preferably, the load voltage value of second lightning arrester is greater than the load voltage value of first lightning arrester.
Preferably, lightning protection partly is embedded on the blade of insulation puncture line clamping, and lightning protection partly is connected with lead is seamless.
Preferably, the gap portion of first lightning arrester is parallel with ZnO valve plate.
Preferably, the threshold value of ZnO valve plate is 0.25 times to 0.5 times of main valve sheet.
Preferably, first lightning arrester and the 3rd lightning arrester are in series and constitute series gap type lightning arrester, and wherein, series gap type lightning arrester has gap and ZnO valve plate.
Preferably, the threshold value of the gap portion of series gap type lightning arrester is 0.2 times of main valve sheet.
To achieve these goals, according to a further aspect in the invention, provide a kind of lightning protection method.
Lightning protection method according to the present invention comprises: adopt batch-type lightning arrester and zinc oxide type lightning arrester; The batch-type lightning arrester is in parallel with a zinc oxide type lightning arrester; Lightning arrester after the parallel connection is connected with a zinc oxide type lightning arrester again.
Lightning protection according to the present invention comprises: first lightning arrester; Second lightning arrester; The 3rd lightning arrester, wherein, first lightning arrester and second lightning arrester are in parallel, this the two be in series with the 3rd lightning arrester together, by the present invention, it is not high enough to have solved in the correlation technique fail safe of lightning protection, and the bigger problem of difficulty of construction, and then has reached the simple and safe lightning-arrest effect of constructing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the lightning protection of the embodiment of the invention;
Fig. 2 is the schematic diagram according to the clearance type lightning arrester of the embodiment of the invention;
Fig. 3 is the schematic diagram according to the ZnO valve plate lightning arrester of the embodiment of the invention;
Fig. 4 is the schematic diagram according to the series connection zinc oxide type lightning arrester of the embodiment of the invention;
Fig. 5 is the schematic diagram according to the preferably lightning protection of the embodiment of the invention;
Fig. 6 is the workflow diagram according to the lightning protection of the embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
According to embodiments of the invention, provide a kind of lightning protection.
Fig. 1 is the lightning protection schematic diagram according to the embodiment of the invention.
As shown in Figure 1, this equipment comprises: first lightning arrester 501, second lightning arrester 503 and the 3rd lightning arrester 505.
Wherein, first lightning arrester 501, this lightning arrester are the clearance type lightning arrester; Second lightning arrester 503, this lightning arrester are zinc oxide type main valve sheet lightning arrester; The 3rd lightning arrester 505, this lightning arrester are zinc oxide type main valve sheet lightning arrester, and wherein, first lightning arrester 501 and second lightning arrester 503 are in parallel, this two be in series with the 3rd lightning arrester 505 together.
Preferably, the load voltage value of above-mentioned second lightning arrester 503 is greater than the load voltage value of first lightning arrester 501.
Preferably, above-mentioned lightning protection partly is embedded on the blade of insulation puncture line clamping, and lightning protection partly is connected with lead is seamless.
Preferably, the gap portion of above-mentioned first lightning arrester 501 is parallel with ZnO valve plate.Wherein, the threshold value of above-mentioned valve block is 0.25 times to 0.5 times of main valve sheet.
Preferably, above-mentioned first lightning arrester 501 and the 3rd lightning arrester 505 are in series and constitute series gap type lightning arrester, and wherein, series gap type lightning arrester has gap and ZnO valve plate.
Preferably, the threshold value of the gap portion of series gap type lightning arrester is 0.2 times of main valve sheet.
In order better to describe the embodiment of the invention, before introducing the specific embodiment of the present invention, carry out following description earlier:
Fig. 2 is the schematic diagram according to the clearance type lightning arrester of the embodiment of the invention.
As shown in Figure 2, the gap lightning arrester, punctures air arc and carries out creepage on electrode when interelectrode voltage acquires a certain degree based on arc-discharge technique.It is strong to have discharge capability, and big (can the reach 100KA) leakage current of through-current capacity is little, the characteristics of Heat stability is good.
This gap lightning arrester metal electrode bears big electric current when discharge, cause the distillation of metal easily, makes and forms startup and normal use that metal coating influences lightning arrester in the discharge cavity.The electrode main component of this lightning rod is the alloy of tungsten metal, and the lightning arrester of this structure is mainly used in power-supply system and does the use of B level lightning arrester, but owing to the reason of lightning arrester self causes fire easily, lightning arrester action back (flying out) breaks away from accidents such as distribution board.Difference according to model is fit to and various distribution standards.
Fig. 3 is the schematic diagram according to the ZnO valve plate lightning arrester of the embodiment of the invention.
Fig. 4 is the schematic diagram according to the series connection zinc oxide type lightning arrester of the embodiment of the invention.
By shown in Figure 4, series gap zinc oxide arrester has used gap and ZnO valve plate, and both protect each other.It is zero that the gap makes the electric charge rate, has solved the ZnO valve plate problem of aging; Because the gap is fragile when afterflow, the superior performance of ZnO valve plate makes its no afterflow, and the insulation of protection equipment is avoided superpotential damages such as thunder and lightning and operation and played good effect.The progressively embodiment of superiority makes series gap zinc oxide arrester more and more to be used.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 5 is the schematic diagram according to the preferably lightning protection of the embodiment of the invention.
Comprise clearance type lightning arrester Q, zinc oxide type main valve sheet lightning arrester F1 and F2 by this lightning arrester equipment shown in Figure 5, according to engine request, the selection of three kinds of lightning arresters is determined according to the given parameter area of the present invention.Clearance type lightning arrester Q is with after zinc oxide type main valve sheet lightning arrester F2 is in parallel, and they are being connected with zinc oxide type main valve sheet lightning arrester F1, the lightning arrester main body of the present invention that Q, F1, F2 constitute, their nominal discharge current unanimity.Wherein, the load voltage value ratio is F1=1, F2=0.25～0.5, Q=0.2.This equipment had both solved the use problem of series gap zinc oxide arrester, solved the problem of its overall inspection again.
At engineering site, the arrester ground end firmly is connected with lightning protection, connect back test ground state, qualified after, by the hot line job rules insulation puncture line clamping is connected with power transmission line.
The present invention at air gap part assisted oxidation zinc lightning arrester F2 in parallel, selects to meet the insulation puncture line clamping of engine request simultaneously on the architecture basics of series gap zinc oxide arrester.Insulation puncture line clamping links cable length and reserves surplus by 10%, presses the high-pressure side connection of insulation puncture line clamping method of attachment with penetrating cable clamp, cable, lightning arrester.Like this, interim when thunder and lightning, the zinc oxide arrester passage conducting fast that zinc oxide type main valve sheet lightning arrester F1, F2 form, the reaction time is 25ns.Because load voltage value F2 " Q, so the conducting of F2 does not influence the work of clearance type lightning arrester Q, after the clearance type lightning arrester Q conducting subsequently, the protection voltage of whole lightning arrester system reaches standard value.After the thunder and lightning, the air gap conducting is closed, and F1, F2 recover high-impedance state.Like this, system test can be finished in F1, F2 loop, its overall performance again with former series gap zinc oxide arrester basically identical, reach testability and long-life purpose.
The present invention is at the in parallel suitable ZnO valve plate of the gap portion of series gap zinc oxide arrester, and the threshold values of ZnO valve plate F2 should be 0.25～0.5 times of main valve sheet F1, and current value should be consistent with the main valve sheet.The threshold values of gap portion Q should be 0.2 times of main valve sheet F1, and current value should be consistent with the main valve sheet.In invention, utilize insulation puncture line clamping and lightning-protecting engineering and synthetic integration product, the integrated of gold utensil and lightening protection installation promptly continues, lightening protection installation partly is embedded on the blade of insulation puncture line clamping, outside lightning-arrest part is connected with lead is seamless, in the process of installing, need not have a power failure, make installment work convenient, fast.
According to the embodiment of the invention, provide a kind of lightning protection method.
Fig. 6 is the workflow diagram to lightning protection enforcement according to the embodiment of the invention.
As shown in Figure 6, this method comprises the steps that S602 is to step S610:
Step S602 presses engine request, selects lightning arrester Q, F1, F2 with the parameter area that the present invention is given;
Step S604, by shown in Figure 5, the lightning arrester main body of the present invention that assembling is made of lightning arrester Q, F1, F2;
Step S606 does integrated testability to the lightning arrester main body after the assembling;
Step S608, selection meets the insulation puncture line clamping of engine request. and insulation puncture line clamping links cable length and reserves surplus by 10%, presses the high-pressure side connection of insulation puncture line clamping method of attachment with penetrating cable clamp, cable, lightning arrester;
Step S610 at engineering site, firmly is connected the arrester ground end with lightning protection, connects back test ground state, qualified after, by the hot line job rules insulation puncture line clamping is connected with power transmission line.
From the above description, as can be seen, the present invention is kept the advantage of series gap zinc oxide arrester, fast, the no afterflow of response speed on the function, life-span is long, and has solved the problem that series gap zinc oxide arrester can not overall inspection, and device security improved greatly.The present invention is the existing lightening protection installation and gold utensil (insulation puncture line clamping) the integrator product that continues, construction point and difficulty of construction have been significantly reduced, in installation process, need not to have a power failure, reduced Utilities Electric Co., for the maintenance and management of company brings great convenience in this total input aspect two.In a word, the present invention has improved construction and operational efficiency for company has reduced the expense input, and has increased the reliability and the fail safe of power supply, not only new transformation has been arranged at built on stilts settling mode aspect anti-lightning strike, and the heavy losses of avoiding thunder and lightning to cause to overhead transmission line greatly.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a lightning protection is characterized in that, comprising:
First lightning arrester;
Second lightning arrester;
The 3rd lightning arrester, wherein,
Described first lightning arrester and described second lightning arrester are in parallel, this two be in series with described the 3rd lightning arrester together.
2. lightning protection according to claim 1 is characterized in that,
Described first lightning arrester is the clearance type lightning arrester;
Described second lightning arrester is a zinc oxide arrester;
Described the 3rd lightning arrester is a zinc oxide arrester.
3. lightning protection according to claim 2 is characterized in that,
The load voltage value of described second lightning arrester is greater than the load voltage value of described first lightning arrester.
4. lightning protection according to claim 1 is characterized in that,
Described lightning protection partly is embedded on the blade of insulation puncture line clamping, and described lightning protection partly is connected with lead is seamless.
5. lightning protection according to claim 1 is characterized in that,
The gap portion of described first lightning arrester is parallel with ZnO valve plate.
6. lightning protection according to claim 5 is characterized in that,
The threshold value of described ZnO valve plate is 0.25 times to 0.5 times of main valve sheet.
7. lightning protection according to claim 1 is characterized in that,
Described first lightning arrester and described the 3rd lightning arrester are in series and constitute series gap type lightning arrester, wherein,
Described series gap type lightning arrester has gap and ZnO valve plate.
8. lightning protection according to claim 7 is characterized in that,
The threshold value of the gap portion of described series gap type lightning arrester is 0.2 times of main valve sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102428431A CN102104249A (en) | 2009-12-17 | 2009-12-17 | Lighting-arresting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102428431A CN102104249A (en) | 2009-12-17 | 2009-12-17 | Lighting-arresting equipment |
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| CN102104249A true CN102104249A (en) | 2011-06-22 |
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| CN2009102428431A Pending CN102104249A (en) | 2009-12-17 | 2009-12-17 | Lighting-arresting equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050952A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Bus type large-capacity overvoltage protection device |
| CN104600689A (en) * | 2014-12-27 | 2015-05-06 | 中国西电电气股份有限公司 | Over-voltage limiter core body |
| CN106847449A (en) * | 2017-02-20 | 2017-06-13 | 辰硕电子(九江)有限公司 | A kind of high pressure varistor of long-life high reliability |
| CN112531464A (en) * | 2020-11-25 | 2021-03-19 | 西安交通大学 | Lightning arrester control method and device for direct-current power system |
| CN114287090A (en) * | 2019-12-13 | 2022-04-05 | Tdk电子股份有限公司 | Device for transferring overvoltage and application thereof |
-
2009
- 2009-12-17 CN CN2009102428431A patent/CN102104249A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050952A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Bus type large-capacity overvoltage protection device |
| CN104600689A (en) * | 2014-12-27 | 2015-05-06 | 中国西电电气股份有限公司 | Over-voltage limiter core body |
| CN106847449A (en) * | 2017-02-20 | 2017-06-13 | 辰硕电子(九江)有限公司 | A kind of high pressure varistor of long-life high reliability |
| CN114287090A (en) * | 2019-12-13 | 2022-04-05 | Tdk电子股份有限公司 | Device for transferring overvoltage and application thereof |
| CN114287090B (en) * | 2019-12-13 | 2022-09-30 | Tdk电子股份有限公司 | Device for transferring overvoltage and application thereof |
| US11894662B2 (en) | 2019-12-13 | 2024-02-06 | Tdk Electronics Ag | Device for discharging over voltages and its use |
| CN112531464A (en) * | 2020-11-25 | 2021-03-19 | 西安交通大学 | Lightning arrester control method and device for direct-current power system |
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Owner name: BEIJING ELECTRIC POWER CORP. BEIJING POWER ECONOMI Effective date: 20121221 Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: BEIJING ELECTRIC POWER CORP. Effective date: 20121221 |
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Effective date of registration: 20121221 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Applicant after: State Grid Corporation of China Applicant after: Beijing Electric Power Corp. Applicant after: State Power Economic Research Institute Address before: 100031 Beijing Qianmen West Street, Xicheng District, No. 41 Applicant before: Beijing Electric Power Corp. |
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Application publication date: 20110622 |