CN104267047B - Microwave cavity for Chu the moisture film of steam wetness measurement - Google Patents
Microwave cavity for Chu the moisture film of steam wetness measurement Download PDFInfo
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- CN104267047B CN104267047B CN201410482092.1A CN201410482092A CN104267047B CN 104267047 B CN104267047 B CN 104267047B CN 201410482092 A CN201410482092 A CN 201410482092A CN 104267047 B CN104267047 B CN 104267047B
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- 238000005259 measurement Methods 0.000 title claims abstract description 33
- 230000033228 biological regulation Effects 0.000 claims abstract description 34
- 239000011148 porous material Substances 0.000 claims abstract description 30
- 238000009825 accumulation Methods 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 230000008021 deposition Effects 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000008859 change Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Abstract
The invention discloses the microwave cavity of a kind of Chu moisture film for steam wetness measurement, pipe, resonance lumen and frequency regulation pipe is entered including the most threaded steam flow, steam flow enters pipe, is provided with the drop accumulation chamber of annular between resonance lumen and gasket seal, resonance lumen is provided with the drop outlet port connected with drop accumulation chamber, steam flow enters pipe and is provided with the axial hole connected with drop accumulation chamber, and the pore that axial hole enters pipe by the steam flow upper radial hole arranged of entrance pipe with steam flow connects；It is interval with front isolated tube in the pore of steam flow entrance pipe, it is interval with rear isolated tube in the pore of frequency regulation pipe, in resonance lumen pore, the part between front isolated tube and rear isolated tube constitutes measurement chamber, resonance lumen is provided with male part installing hole, male part installing hole end and measurement chamber；The present invention is the microwave cavity for automatically removing the deposition of moisture film on cavity inner wall that a kind of pipe border is adaptable, with low cost.
Description
Technical field
The present invention relates to a kind of microwave cavity that can automatically remove the deposition of moisture film on cavity inner wall for steam moisture being carried out accurate on-line measurement, belonging to technical field of measurement and test.
Background technology
Moist steam is widely present in whole levels of end what and the water cooled reator nuclear steam turbine of thermal power station's condensing turbine low pressure (LP) cylinder, the existence of moist steam mainly give the operation of steam turbine bring of both problem: one is that the shock etc. of thermodynamic losses, wet steam loss, water droplet flowing relative with main flow and water droplet and the blade owing to the non-equilibrium flowing of steam brings can cause the stage efficiency reduction being operated in wet-steam region；Two is the blade that the little water droplet in moist steam can corrode steam turbine, makes blade surface become coarse, pit, or even fracture occurs, has a strong impact on the safe operation of steam turbine.The precise determination of steam turbine exhaust steam moisture, contributes to understanding the distribution of humidity, determines that blade strengthens mode and the position of protection, it is ensured that the safe operation of unit；Assist in wet-steam region stage efficiency or even whole unit efficiency, optimize the economical operation of unit；Optimization for wet-steam region stage simultaneously designs to provide to be instructed, and provides help to the formation mechenism of moist steam and the research of mode.Therefore, in steam turbine, accurately measuring of steam moisture has important theory significance and practical value.
Under certain pressure (temperature), the humidity of moist steam its dielectric constant different is the most different, and both one_to_one corresponding, the change of dielectric constant can affect the resonant frequency of resonator cavity, therefore, it can indirectly measure steam moisture by measurement resonant frequency.Resonator cavity typically uses the cylindrical cavity being prone to processing, if the structure of resonator cavity, size are certain, when the pressure (temperature) of moist steam is known, moist steam humidity is different, its dielectric property is different, and when moist steam flows through resonator cavity, the resonant frequency of resonator cavity can occur to change accordingly, change by the resonant frequency of pressure (temperature) resonant cavity of monitoring moist steam, it is possible to indirectly obtain the humidity change of moist steam.During measuring, when moist steam flows through resonator cavity, due to the deposition of drop, water membrane can be formed at resonator cavity inner surface, cavity wall moisture film can produce both sides adverse effect to measurement: increases dielectric loss, makes the quality factor of resonator cavity decline, and reduces the precision measured；The resonant frequency making measurement chamber offsets, and increases measurement error.Accordingly, it would be desirable to design a kind of microwave cavity automatically removing the deposition of moisture film on cavity inner wall, measure ground accuracy and accuracy to improve.
Summary of the invention
It is an object of the invention to provide a kind of simple in construction, dependable performance, pipe border adaptable, with low cost for the microwave cavity of moisture film deposition on cavity inner wall can be automatically removed.
nullFor achieving the above object，The present invention adopts the following technical scheme that the microwave cavity of Chu the moisture film for steam wetness measurement，Pipe is entered including the most threaded steam flow、Resonance lumen and frequency regulation pipe，Steam flow enters pipe and frequency regulation pipe is equipped with the external screw thread for connecting resonance lumen，Steam flow enters the gasket seal of the radial direction being folded with annular between pipe rear end face and resonance lumen，The rear pad of the radial direction of annular it is folded with between frequency regulation pipe front end face and resonance lumen，Steam flow enters pipe、The drop accumulation chamber of annular it is provided with between resonance lumen and gasket seal，Drop accumulation chamber is looped around the outer ring of gasket seal，Resonance lumen is provided with the drop outlet port connecting and can being connected exhaust tube with drop accumulation chamber，Steam flow enters pipe and is provided with the axial hole connected with drop accumulation chamber，Axial hole is blind hole，The pore that axial hole enters pipe by the steam flow upper radial hole arranged of entrance pipe with steam flow connects；It is interval with front isolated tube in the pore of steam flow entrance pipe, it is interval with rear isolated tube in the pore of frequency regulation pipe, the front end of front isolated tube rear end and rear isolated tube is all stretched in the pore of resonance lumen, in resonance lumen pore, the part between front isolated tube and rear isolated tube constitutes measurement chamber, resonance lumen is provided with male part installing hole, male part installing hole end and measurement chamber；Anterior outer ring wall and frequency regulation outer ring, the pipe rear portion wall of described steam flow entrance pipe are taper surface.
The pore of steam flow entrance pipe is spaced sheathed two front isolated tubes the most successively, before adjacent two, between isolated tube and between steam flow entrance pipe inner peripheral surface and adjacent front isolated tube, fixes connection by flat board radially respectively.
Isolated tube after being spaced sheathed two the most successively in the pore of frequency regulation pipe, connects by flat board radially is fixing between isolated tube and between frequency regulation pipe inner peripheral surface and adjacent rear isolated tube after adjacent two respectively.
Described drop outlet port is for arranging several around uniform interval, border.
Described axial hole is for arranging several around uniform interval, border.
The microwave cavity of Chu the moisture film for steam wetness measurement of the present invention, mainly solve measurement accuracy of resonant frequencies and affected this problem by cavity inner wall deposited water film, it is a kind of microwave cavity automatically removing moisture film, anterior outer ring wall and frequency regulation outer ring, the pipe rear portion wall of the steam flow entrance pipe of this resonator cavity are taper surface, decrease measurement error；Steam flow at front end steam flow entrance enters and is machined with radial hole and axial hole on pipe, and combine drop accumulation chamber and drop outlet port, form the passage of extraction moisture film, the moisture film of formation is taken away as early as possible, do not affect the normal work measuring chamber, so that moisture measurement is not affected by deposited water film.Present configuration is simple, easy to process, and conjunction measuring circuit and air pump can be used for flowing wet steam humidity is carried out high precision online measuring.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is the structural representation of resonance lumen；
Fig. 4 is the A-A view in Fig. 3.
Detailed description of the invention
Microwave cavity by Chu the moisture film for steam wetness measurement shown in Fig. 1-Fig. 4, pipe 1, resonance lumen 3 and frequency regulation pipe 5 is entered including the most threaded steam flow, steam flow enters penetrating body and three's pore before and after pipe 1, resonance lumen 3 and frequency regulation pipe 5 are and is sequentially communicated, and steam flow enters pipe 1, resonance lumen 3 and frequency regulation pipe 5 for being coaxially disposed.Anterior outer ring wall and frequency regulation outer ring, the pipe 5 rear portion wall of described steam flow entrance pipe 1 are taper surface, and it is the front end coned face to contract that steam flow enters the anterior outer ring wall of pipe 1, frequency regulation outer ring, pipe 5 rear portion wall is the rear end coned face to contract, it is identical with the geometric parameter of the coned face on frequency regulation pipe 5 that steam flow enters the coned face on pipe 1, the two phase flow of damp steam parameter that so can make turnover resonator cavity is consistent with main flow parameter, reduces measured deviation to greatest extent.
The front portion at rear portion and frequency regulation pipe 5 that steam flow enters pipe 1 is equipped with the external screw thread for connecting resonance lumen 3, the front-end and back-end of resonance lumen 3 are equipped with reaming, it is equipped with female thread in each reaming, steam flow enters the rear end external screw thread of pipe 1 and matches with female thread in resonance lumen 3 front end reaming, and the front end external screw thread of frequency regulation pipe 5 matches with female thread in resonance lumen 3 rear end reaming.
Steam flow enters the gasket seal 2 being folded with annular between pipe 1 rear end face and resonance lumen 3, gasket seal 2 is radially arranged, gasket seal 2 is particularly located between rear end face and the bottom surface, hole of resonance lumen 3 front end reaming that steam flow enters pipe 1, steam flow enters pipe 1, the drop accumulation chamber 6 of annular it is provided with between resonance lumen 3 and gasket seal 2, i.e. drop accumulation chamber 6 is entered pipe 1 rearward end by steam flow, the reaming side of resonance lumen 3 front end reaming and reaming bottom surface and gasket seal 2 outer peripheral surface are enclosed to set and are formed, drop accumulation chamber 6 is positioned at the reaming of resonance lumen 3 front end, drop accumulation chamber 6 is looped around the outer ring of gasket seal 2.Gasket seal 2 can prevent moist steam steam flow from entering the gap between pipe 1 resonant cavity pipe 3 by steam flow and enter drop accumulation chamber 6.Resonance lumen 3 is provided with the drop outlet port 3-1 connecting and can being connected exhaust tube with drop accumulation chamber 6, drop outlet port 3-1 is the radial hole being arranged on the tube wall at resonance lumen 3 front end reaming, and 3-1 inner end, drop outlet port connects with drop accumulation chamber 6, external port is positioned on the wall of resonance lumen 3 outer ring.Described drop outlet port 3-1 arranges eight around uniform interval, border.Eight drop outlet port 3-1 all can receive on the evacuation trachea in the outside air pump being separately provided of resonance lumen 3 or steam turbine.
Steam flow enters pipe 1 and is provided with the axial hole 1-2 connected with drop accumulation chamber 6, axial hole 1-2 is for extend axially back and forth, axial hole 1-2 is positioned at steam flow and enters the radial direction side of pipe pore, axial hole 1-2 is blind hole, 1-2 front end, axial hole is positioned at steam flow entrance pipe 1 body, rear end connects with drop accumulation chamber 6, and described axial hole 1-2 arranges eight around uniform interval, border.Axial hole 1-2 is entered the pore of radial hole 1-1 and the steam flow entrance pipe 1 arranged on pipe 1 and connects by steam flow, and each axial hole 1-2 and steam flow enter and be equipped with four radial hole 1-1 the most spaced between pipe 1 pore.
Being folded with the rear pad 4 of annular between frequency regulation pipe 5 front end face and resonance lumen 3, rear pad 4 is radially arranged, and rear pad 4 is particularly located between front end face and the bottom surface, hole of resonance lumen 3 rear end reaming of frequency regulation pipe 5.Gasket seal 2 and metallic gasket are metallic gasket.
It is interval with axially extended front isolated tube 1-3 in the pore of steam flow entrance pipe 1, and the pore of steam flow entrance pipe 1 is spaced the most sheathed two front isolated tube 1-3 altogether the most successively, connect by flat board 1-4 radially is fixing respectively between isolated tube 1-3 and between steam flow entrance pipe 1 inner peripheral surface and adjacent front isolated tube 1-3 before adjacent two, linked together by four uniform spaced described flat board 1-4 in border between isolated tube 1-3 before adjacent two, steam flow enters and links together also by four uniform spaced described flat board 1-4 in border between pipe 1 inner peripheral surface and adjacent front isolated tube 1-3；It is interval with axial rear isolated tube 5-1 in the pore of frequency regulation pipe 5, and isolated tube 5-1 after being spaced the most sheathed two the most successively in the pore of frequency regulation pipe 5, connect by flat board 1-4 radially is fixing the most respectively between isolated tube 5-1 and between frequency regulation pipe 5 inner peripheral surface and adjacent rear isolated tube 5-1 after adjacent two, linked together by four uniform spaced described flat board 1-4 in border between isolated tube 5-1 after adjacent two, link together also by four uniform spaced described flat board 1-4 in border between frequency regulation pipe 5 inner peripheral surface and adjacent rear isolated tube 5-1.Front isolated tube 1-3 and rear isolated tube 5-1 is light-wall pipe, and described flat board 1-4 is thin-walled flat board.
Front isolated tube 1-3 rear end extends rearward in the pore of resonance lumen 3, the front end of rear isolated tube 5-1 is stretched into forward in the pore of resonance lumen 3, front isolated tube 1-3 and rear isolated tube 5-1 is arranged for interval, it is provided with space between front isolated tube 1-3 rear end and rear isolated tube 5-1 front end, and the part between front isolated tube 1-3 and rear isolated tube 5-1 constitutes measurement chamber 4-1 in resonance lumen 3 pore, resonance lumen 3 is provided with male part installing hole 3-2 radially, the inner end of male part installing hole 3-2 connects with measuring chamber 4-1, the external port of male part installing hole 3-2 is positioned at the lateral surface of resonance lumen 3, male part installing hole 3-2 is in order to install male part, coupled modes can be probe coupling, hole coupling or loop coupling.Moist steam steam flow carries out moisture measurement by male part in measuring chamber 4-1, front isolated tube 1-3 and the flat board 1-4 connected on it forms grid, rear isolated tube 5-1 and the flat board 1-4 connected on it also forms grid, when grid gap size is less than microwave wavelength in resonator cavity, the isolation to microwave can be realized, it is ensured that resonator cavity has higher quality factor.
By changing the rear pad 4 of different-thickness, the degree of depth in rear end precession resonance lumen 3 pore of isolated tube 5-1 after adjusting in frequency regulation pipe 5, thus adjust the effective working portion of resonance lumen 3 and measure the size of chamber 4-1, realize the regulation to resonator cavity operating frequency.
Described steam flow entrance pipe 1, gasket seal 2, resonance lumen 3, rear pad 4 and frequency regulation pipe 5 are formed by low-expansion identical materials processing.The present invention is not limited to above-mentioned form, and described drop outlet port 3-1, axial hole 1-2, radial hole 1-1, front isolated tube 1-3 and rear isolated tube 5-1 all can be arranged as required to several.
nullThe microwave cavity of Chu the moisture film for steam wetness measurement of the present invention，When it is arranged on steam turbine last stage exhaust passage and carries out the measurement of exhaust steam moisture，Little water droplet in moist steam starts to start deposition in steam flow enters pipe 1 inside pipe wall，And the flow direction along steam，The water film thickness making resonance lumen 3 inside pipe wall deposit also can be gradually increased，If so the liquid film being deposited on the internal face of steam flow entrance pipe 1 is not removed，Will gradually extend on the inside pipe wall of resonance lumen 3，Affect the resonant frequency of resonator cavity，So that humidity measurement results produces error，And steam flow enters the radial hole 1-1 on pipe 1、Steam flow enters the axial hole 1-2 on pipe 1、Drop accumulation chamber 6 and drop outlet port 3-1 are sequentially communicated and together form the passage of extraction liquid film，The moisture film being deposited on steam flow entrance pipe 1 inwall passes through to be pumped under the effect evacuating trachea in external air pump or steam turbine of the passage of this extraction liquid film，Thus play the effect automatically removing moisture film.
In addition, when the little water droplet in moist steam is gradually deposited on front isolated tube 1-3 tube wall, gradually form a stable moisture film, moisture film isolated tube 1-3 rear portion in the past is flowed to again measure in chamber 4-1 again, a part as steam moisture is measured, i.e. when resonator cavity steady operation, is deposited on how many moisture films on front isolated tube 1-3, just there are how many moisture films to reenter the inside measuring chamber 4-1, thus do not interfere with the measurement to steam moisture.Based on above reason, the microwave cavity of Chu the moisture film for steam wetness measurement of the present invention, mainly by removing the moisture film on steam flow entrance pipe 1 internal face, prevent moisture film from accumulating on resonance lumen 3 inside pipe wall face, decrease the impact on measuring chamber 4-1 resonator cavity frequency of the resonance lumen 3 inside pipe wall deposited water film, coordinate with microwave signal process circuit, it is possible to achieve the high precision online measuring to flowing wet steam humidity.
Claims (5)
- null1. it is used for the microwave cavity of Chu the moisture film of steam wetness measurement，It is characterized in that: include that the most threaded steam flow enters pipe、Resonance lumen and frequency regulation pipe，Steam flow enters pipe and frequency regulation pipe is equipped with the external screw thread for connecting resonance lumen，Steam flow enters the gasket seal of the radial direction being folded with annular between pipe rear end face and resonance lumen，The rear pad of the radial direction of annular it is folded with between frequency regulation pipe front end face and resonance lumen，Steam flow enters pipe、The drop accumulation chamber of annular it is provided with between resonance lumen and gasket seal，Drop accumulation chamber is looped around the outer ring of gasket seal，Resonance lumen is provided with the drop outlet port connecting and can being connected exhaust tube with drop accumulation chamber，Steam flow enters pipe and is provided with the axial hole connected with drop accumulation chamber，Axial hole is blind hole，The pore that axial hole enters pipe by the steam flow upper radial hole arranged of entrance pipe with steam flow connects；The pore of steam flow entrance pipe is spaced the most sheathed two front isolated tubes altogether the most successively, isolated tube after being spaced the most sheathed two the most successively in the pore of frequency regulation pipe, the front end of front isolated tube rear end and rear isolated tube is all stretched in the pore of resonance lumen, in resonance lumen pore, the part between front isolated tube and rear isolated tube constitutes measurement chamber, resonance lumen is provided with male part installing hole, male part installing hole end and measurement chamber；Anterior outer ring wall and frequency regulation outer ring, the pipe rear portion wall of described steam flow entrance pipe are taper surface.
- 2. the microwave cavity of Chu the moisture film for steam wetness measurement as claimed in claim 1, it is characterized in that: the pore of steam flow entrance pipe is spaced sheathed two front isolated tubes the most successively, before adjacent two, between isolated tube and between steam flow entrance pipe inner peripheral surface and adjacent front isolated tube, fix connection by flat board radially respectively.
- 3. the microwave cavity of Chu the moisture film for steam wetness measurement as claimed in claim 1, it is characterized in that: isolated tube after being spaced sheathed two the most successively in the pore of frequency regulation pipe, connect by flat board radially is fixing respectively between isolated tube and between frequency regulation pipe inner peripheral surface and adjacent rear isolated tube after adjacent two.
- 4. the microwave cavity of Chu the moisture film for steam wetness measurement as claimed in claim 1, it is characterised in that: described drop outlet port is for arranging several around uniform interval, border.
- 5. the microwave cavity of Chu the moisture film for steam wetness measurement as claimed in claim 1, it is characterised in that: described axial hole is for arranging several around uniform interval, border.
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| CN201410482092.1A CN104267047B (en) | 2014-09-19 | 2014-09-19 | Microwave cavity for Chu the moisture film of steam wetness measurement |
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| CN201410482092.1A CN104267047B (en) | 2014-09-19 | 2014-09-19 | Microwave cavity for Chu the moisture film of steam wetness measurement |
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| CN104267047B true CN104267047B (en) | 2016-09-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4270083A (en) * | 1978-11-11 | 1981-05-26 | Bayer Aktiengesellschaft | Microwave moisture measuring instrument with switchable measuring regions |
| CN101183081A (en) * | 2007-12-19 | 2008-05-21 | 华北电力大学 | Microwave sensor used for detecting steam humidity |
| RU2410672C2 (en) * | 2009-04-17 | 2011-01-27 | Учреждение Российской академии наук Институт проблем управления им. В.А. Трапезникова РАН | Method to measure volume content of oil and water in flow of oil and water emulsion in pipeline |
| CN102253059A (en) * | 2011-06-22 | 2011-11-23 | 华北电力大学（保定） | Temperature self-compensation microwave sensor for humidity measurement of steam |
| CN204101479U (en) * | 2014-09-19 | 2015-01-14 | 国家电网公司 | For the microwave cavity of Chu the moisture film of steam wetness measurement |
-
2014
- 2014-09-19 CN CN201410482092.1A patent/CN104267047B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4270083A (en) * | 1978-11-11 | 1981-05-26 | Bayer Aktiengesellschaft | Microwave moisture measuring instrument with switchable measuring regions |
| CN101183081A (en) * | 2007-12-19 | 2008-05-21 | 华北电力大学 | Microwave sensor used for detecting steam humidity |
| RU2410672C2 (en) * | 2009-04-17 | 2011-01-27 | Учреждение Российской академии наук Институт проблем управления им. В.А. Трапезникова РАН | Method to measure volume content of oil and water in flow of oil and water emulsion in pipeline |
| CN102253059A (en) * | 2011-06-22 | 2011-11-23 | 华北电力大学（保定） | Temperature self-compensation microwave sensor for humidity measurement of steam |
| CN204101479U (en) * | 2014-09-19 | 2015-01-14 | 国家电网公司 | For the microwave cavity of Chu the moisture film of steam wetness measurement |
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Inventor after: Ge Ting Inventor after: Liu Jingyu Inventor after: Zhang Junke Inventor after: Han Zhonghe Inventor after: Qian Jiangbo Inventor after: Zhang Qingfu Inventor after: Fan Xin Inventor after: Shi Feng Inventor before: Ge Ting Inventor before: Liu Jingyu Inventor before: Zhang Junke Inventor before: Han Zhonghe Inventor before: Qian Jiangbo |
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Effective date of registration: 20161027 Address after: 450052 Songshan, Zhengzhou, Henan District No. 27 South Road, No. 85 Patentee after: Electric Power Research Institute, State Grid Henan Electric Power Company Patentee after: North China Electric Power University Patentee after: Henan En Pai high-tech Group Co.,Ltd Patentee after: State Grid Corporation of China Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: Electric Power Research Institute, State Grid Henan Electric Power Company Patentee before: North China Electric Power University |
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Address after: 450052 No. 85 South Songshan Road, 27 District, Henan, Zhengzhou Patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee after: NORTH CHINA ELECTRIC POWER University Patentee after: Henan jiuyu enpai Power Technology Co.,Ltd. Patentee after: State Grid Corporation of China Address before: 450052 No. 85 South Songshan Road, 27 District, Henan, Zhengzhou Patentee before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee before: NORTH CHINA ELECTRIC POWER University Patentee before: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. Patentee before: State Grid Corporation of China |