CN203632009U - High impedance loop in transformer station - Google Patents

High impedance loop in transformer station Download PDF

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Publication number
CN203632009U
CN203632009U CN201320793414.5U CN201320793414U CN203632009U CN 203632009 U CN203632009 U CN 203632009U CN 201320793414 U CN201320793414 U CN 201320793414U CN 203632009 U CN203632009 U CN 203632009U
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CN
China
Prior art keywords
high resistance
sleeve pipe
loop
lightning arrester
pipe
Prior art date
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Active
Application number
CN201320793414.5U
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Chinese (zh)
Inventor
孙昕
王刚
邱宁
方静
运志涛
曾静
权白露
樊玥
刘晓瑞
陈宏明
梁言桥
彭开军
戚乐
马亮
周波
王大鹏
韩宛辰
张东升
潘益华
王卫华
王晓京
项力恒
康鹏
刘菲
余波
周德才
丁晓飞
庞亚东
赵衡
吴祎琼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Northwest Electric Power Design Institute of China Power Engineering Consulting Group
Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Northeast Electric Power Design Institute of China Power Engineering Consulting Group
China Power Engineering Consulting Group Corp
Electric Power Planning and Engineering Institute Co Ltd
Original Assignee
State Grid Corp of China SGCC
Northwest Electric Power Design Institute of China Power Engineering Consulting Group
Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Northeast Electric Power Design Institute of China Power Engineering Consulting Group
North China Electric Power Design Institute of China Power Engineering Consulting Group Corp
China Power Engineering Consulting Group Corp
Electric Power Planning and Engineering Institute Co Ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by State Grid Corp of China SGCC, Northwest Electric Power Design Institute of China Power Engineering Consulting Group, Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group, China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd, China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp, Northeast Electric Power Design Institute of China Power Engineering Consulting Group, North China Electric Power Design Institute of China Power Engineering Consulting Group Corp, China Power Engineering Consulting Group Corp, Electric Power Planning and Engineering Institute Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201320793414.5U priority Critical patent/CN203632009U/en
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Publication of CN203632009U publication Critical patent/CN203632009U/en
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Abstract

The application discloses a high impedance loop in a transformer station; the high impedance loop comprises an electric appliance equipment sleeve pipe, a lightning arrester, a voltage transformer and a high impedance sleeve pipe arranged in parallel; the lightning arrester, the voltage transformer and the high impedance sleeve pipe are connected through pipe busbar arranged on top; the electric appliance equipment sleeve pipe is connected with an end portion, extending from the top of the lightning arrester, of the pipe busbar through a soft guide line arranged on the top. Compared with the prior art, the high impedance loop disclosed by the application does not have a grounding switch and an insulator, the lightning arrester and the voltage transformer are employed to support the pipe busbar, thereby reducing the construction number of the high impedance loop equipment, reducing vertical size, and improving anti-shock performance of the loop equipment, and simultaneously satisfying overvoltage protection performance demand of the high impedance loop.

Description

High resistance loop in a kind of transformer station
Technical field
The utility model relates to power industry field, particularly relates to the high resistance loop in a kind of transformer station.
Background technology
Along with the rapid growth of national economy, extra-high-voltage alternating current electrical network enters the Large-scale programming construction period, and a large amount of transformer stations build and put into operation successively, wherein, comprises a large amount of 1000kV transformer station.
In prior art, the structural representation in the high resistance loop of 1000kV transformer station conventionally as shown in Figure 1, wherein, described high resistance loop comprises: electric equipment sleeve pipe 100, earthed switch 200, voltage transformer 300, the first supporting insulator 400, lightning arrester 500, the second supporting insulator 600 and high resistance sleeve pipe 700, these 7 groups of equipment are set up in parallel.And each equipment top is connected with pipe bus 800.Wherein, described earthed switch 200, the first supporting insulator 400 and the second supporting insulator 600 are for supporting described pipe bus 800, and described sleeve pipe 100, voltage transformer 300, lightning arrester 500 and high resistance sleeve pipe 700 utilize gold utensil, and realize and being flexible coupling between described pipe bus 800.In addition, sometimes according to actual application demand, to be also that described high resistance loop increases by one group of lightning arrester of installing, in this case, need to increase again one group of supporting insulator and support, thereby form the high resistance loop in transformer station by nine groups that are set up in parallel or more equipment.
But, inventor finds in the application's research process, high resistance of the prior art loop longitudinal size is large, for example, above-mentioned seven groups of equipment are set up in parallel the high resistance loop longitudinal size forming and are about 43m, nine groups of equipment build side by side the high resistance loop longitudinal size forming and are about 56m, and equipment is numerous, thereby have the problem of poor seismic behavior.
Utility model content
In view of this, the purpose of this utility model is the high resistance loop in open a kind of transformer station, and to solve the problem of high resistance loop poor seismic behavior in prior art, specific embodiments is as follows:
A high resistance loop in transformer station, comprising:
The electric equipment sleeve pipe, lightning arrester, voltage transformer and the high resistance sleeve pipe that are set up in parallel;
Between described lightning arrester, voltage transformer and high resistance sleeve pipe, connect by the pipe bus that is arranged on top;
Described electric equipment sleeve pipe, by being arranged on the flexible conductor at top, is connected with the end of the extended described pipe bus in described lightning arrester top.
Preferably, described electric equipment sleeve pipe is:
Gas insulated combined electric appliance equipment sleeve pipe, or half gas insulated combined electric appliance equipment sleeve pipe.
Preferably,
Between described lightning arrester and described pipe bus, adopt fixing gold utensil to be connected;
Between described voltage transformer and described pipe bus, adopt slip gold utensil to be connected.
Preferably,
Described high resistance sleeve pipe, by flexible connection fitting, is realized and being connected with described pipe bus in the mode being flexible coupling.
Preferably,
The flexible conductor that connects the end of described electric equipment sleeve pipe and described pipe bus, the wire that is JLHN58K-1600 by four models forms jointly;
Wherein, described flexible conductor is by the mode being flexible coupling, and the end of the described pipe bus extending with described electric equipment sleeve pipe and described lightning arrester top is respectively realized and being connected.
Preferably,
Between described electric equipment sleeve pipe and described lightning arrester, the mode connecing with T by described flexible conductor realizes and being flexible coupling.
The application discloses the high resistance loop in a kind of transformer station, and described high resistance loop is made up of electric equipment sleeve pipe, lightning arrester, voltage transformer and high resistance sleeve pipe, and these four groups of equipment are set up in parallel.And, between described lightning arrester, voltage transformer and high resistance sleeve pipe, connecting by the pipe bus that is arranged on top, described electric equipment sleeve pipe, by being arranged on the flexible conductor at top, is connected with the end of the extended described pipe bus in described lightning arrester top.
The disclosed high resistance of the application loop; with respect to high resistance of the prior art loop; no longer be provided with earthed switch and supporting insulator; but utilize lightning arrester and voltage transformer stay pipe bus; thereby reduce the quantity that builds the equipment in high resistance loop; and longitudinal size reduces, in meeting high resistance loop overvoltage protection performance demand, improve anti-seismic performance.
Further, because in the application, disclosed high resistance loop is with respect to prior art, longitudinal size reduces, and corresponding floor space reduces, and has reduced the investment to soil; In addition, owing to having reduced the quantity of equipment, also reduce accordingly to the investment of equipment in the disclosed high resistance of the application loop.Therefore, in the process of construction of transformer station, adopt the disclosed high resistance of the application loop effectively to reduce costs, reduce investment, and range of application is wider.For example, send in engineering at Wan electricity Dong, the existing high resistance loop using comprises nine groups of equipment that are set up in parallel, through data analysis, adopt the application disclosed scheme, 3 groups of supporting insulators, 1 group of lightning arrester and 1 group of earthed switch can be saved in every group of high resistance loop, correspondingly save approximately 5,800,000 yuan of equipment investments, for Wan Nan transformer station, can save and take up an area approximately 1.49 hectares.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below.Apparently, the accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, is not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation in the high resistance loop in the disclosed a kind of transformer station of prior art;
Fig. 2 is the structural representation in the high resistance loop in the disclosed a kind of transformer station of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out to clear, complete description, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
In order to solve the problem of the existing poor seismic behavior in high resistance of the prior art loop, the application discloses the high resistance loop in a kind of transformer station.
The structural representation in high resistance loop shown in Figure 2, the high resistance loop in the disclosed transformer station of the application comprises: electric equipment sleeve pipe 11, lightning arrester 12, voltage transformer 13 and high resistance sleeve pipe 14.
Wherein, described electric equipment sleeve pipe 11, lightning arrester 12, voltage transformer 13 and high resistance sleeve pipe 14 are set up in parallel.
And, between described lightning arrester 12, voltage transformer 13 and high resistance sleeve pipe 14, connect by the pipe bus 15 that is arranged on top;
Described electric equipment sleeve pipe 11, by being arranged on the flexible conductor 16 at top, is connected with the end of the extended described pipe bus of described lightning arrester 12.
The application discloses the high resistance loop in a kind of transformer station, and described high resistance loop is made up of electric equipment sleeve pipe, lightning arrester, voltage transformer and high resistance sleeve pipe, and these four groups of equipment are set up in parallel.And, between described lightning arrester, voltage transformer and high resistance sleeve pipe, connecting by the pipe bus that is arranged on top, described electric equipment sleeve pipe, by being arranged on the flexible conductor at top, is connected with the end of the extended described pipe bus in described lightning arrester top.
The disclosed high resistance of the application loop; with respect to high resistance of the prior art loop; no longer be provided with earthed switch and supporting insulator; but utilize lightning arrester and voltage transformer stay pipe bus; thereby reduce the quantity that builds the equipment in high resistance loop; and the longitudinal size in described high resistance loop reduces, in meeting high resistance loop overvoltage protection performance demand, improve anti-seismic performance.
Further, because in the application, disclosed high resistance loop is with respect to prior art, longitudinal size reduces, and corresponding floor space reduces, and has reduced the investment to soil; In addition, owing to having reduced the quantity of equipment, also reduce accordingly to the investment of equipment in the disclosed high resistance of the application loop.Therefore, in the process of construction of transformer station, adopt the disclosed high resistance of the application loop effectively to reduce costs, reduce investment, and range of application is wider.For example, send in engineering at Wan electricity Dong, the existing high resistance loop using comprises nine groups of equipment that are set up in parallel, through data analysis, adopt the application disclosed scheme, 3 groups of supporting insulators, 1 group of lightning arrester and 1 group of earthed switch can be saved in every group of high resistance loop, correspondingly save approximately 5,800,000 yuan of equipment investments, for Wan Nan transformer station, can save and take up an area approximately 1.49 hectares.
Wherein, in the disclosed high resistance of the application loop, described electric equipment sleeve pipe 11 is: gas insulated combined electric appliance equipment (Gas Insulated Switchgear, GIS) sleeve pipe, or half gas insulated combined electric appliance equipment (hypid gas insulated switchgear, HGIS) sleeve pipe.For example, in ultra-high voltage transformer station, in 1000kV high resistance loop, conventionally adopt 1000kV GIS sleeve pipe.
Further, between described lightning arrester 12 and described pipe bus 15, adopt fixing gold utensil to be connected; Between described voltage transformer 13 and described pipe bus 15, adopt slip gold utensil to be connected.
When pipe bus 15 connection in high resistance loop, skid off for fear of pipe bus 15, need to have any to be set to be fixedly connected with, and be fixedly connected with, to be in the requirement of tolerance aspect higher.Because the intensity of lightning arrester 12 is generally higher than described voltage transformer 13, therefore, for ensureing fail safe and reasonability, conventionally between lightning arrester 12 and pipe bus 15, adopt fixing gold utensil to be connected, and adopt slip gold utensil to be connected between voltage transformer 13 and pipe bus 15.
Further, described high resistance sleeve pipe 14, by flexible connection fitting, is realized and being connected with described pipe bus 15 in the mode being flexible coupling.Wherein, described flexible connection fitting can be copper pigtail, certainly, can be also the flexible connection fitting of other kinds, and the application is not construed as limiting this.
The disclosed high resistance of the application loop, adopts the mode being flexible coupling, and has realized being connected between described high resistance sleeve pipe 14 and described pipe bus 15.Due to the mode being flexible coupling, the active force to arrangement terminal can reduce earthquake time, thus improve the anti-seismic performance in whole high resistance loop.
Further, connect the flexible conductor 16 of the end of described electric equipment sleeve pipe 11 and described pipe bus, the wire that is JLHN58K-1600 by four models forms jointly, and the diameter of the wire that common described model is JLHN58K-1600 is 70mm.
Wherein, described flexible conductor is by the mode being flexible coupling, and the end of the described pipe bus 15 extending with the top of described electric equipment sleeve pipe 11 and described lightning arrester 12 is respectively realized and being connected.
Between described electric equipment sleeve pipe 11 and described lightning arrester 12, adopt the mode of flexible conductor to connect, the active force of the terminal to these two equipment can reduce earthquake equally time, improves the anti-seismic performance in whole high resistance loop.Meanwhile, for the connection that makes described electric equipment sleeve pipe 11 and described lightning arrester 12 more closely attractive in appearance, construct conveniently, conventionally select by four JLHN58K-1600 the flexible conductor that the wire that diameter is 70mm forms.Certainly, in actual demand, also can adopt other forms of flexible conductor, the application does not limit this.
Further, between described electric equipment sleeve pipe 11 and described lightning arrester 12, the mode connecing with T by described flexible conductor 15 realizes and being flexible coupling.
High resistance loop in the disclosed a kind of transformer station of the application, the mode that adopts lightning arrester, voltage transformer and high resistance sleeve pipe to support pipe bus, supporting insulator and earthed switch in prior art are cancelled, thereby reduce the number of devices in high resistance loop, shorten the longitudinal size in high resistance loop, thereby reduce the destruction of seismic force to each equipment in high resistance loop, improved the overall anti-seismic performance in whole high resistance loop.Meanwhile, the utility model, owing to having optimized equipment setting, has also correspondingly been saved floor space and equipment investment.
In connected mode, between electric equipment sleeve pipe in described high resistance loop and described lightning arrester, be connected by the flexible conductor realization that is arranged on top, between described lightning arrester and pipe bus, adopt fixing gold utensil to be connected, between described voltage transformer and pipe bus, adopt slip gold utensil to be connected.The active force of the terminal to these two equipment when this connected mode can reduce earthquake, further improves the anti-seismic performance in whole high resistance loop.
In addition, the high resistance loop in the application in disclosed transformer station, has cancelled earthed switch.In actual applications, transmission line circuit side in transformer station, conventionally be provided with earthed switch, or be grounded in the mode of hanging ground-wire, for example, in the ultra-high voltage transformer station of 1000kV, at 1000kV transmission line circuit place, conventionally be provided with earthed switch, thereby even cancelled earthed switch in the disclosed high resistance of the application loop, also can not affect the fail safe in described high resistance loop.
Further, the high resistance loop in the disclosed transformer station of the application can also comprise optional equipment, and described optional equipment is set up in parallel between described electric equipment sleeve pipe, lightning arrester, voltage transformer or high resistance sleeve pipe.
The area taking place frequently at some thunder and lightning; in order to strengthen the protective capability to equipment; make it avoid being subject to superpotential harm; two or more lightning arresters is set; in this case; described optional equipment is additional lightning arrester, thereby in described high resistance loop, comprises the electric equipment sleeve pipe being set up in parallel, two lightning arresters, voltage transformer and high resistance sleeve pipes.
Although increasing after optional equipment, in the disclosed high resistance of the application loop, the quantity of equipment increases, but than prior art, the quantity of equipment is still less, and the longitudinal size of occupation of land is little, thereby the anti-seismic performance that has increased high resistance loop, has reduced floor space and equipment investment.
In high resistance loop, electric equipment sleeve pipe 11 is directly connected with the circuit of transformer station, and lightning arrester 12, voltage transformer 13 and high resistance sleeve pipe 14 these remaining equipment, connect into a loop, is connected in parallel in the circuit of described transformer station.In the time that the circuit in described transformer station is struck by lightning, there is catadioptric in the loop connecting in Lightning Incoming Wave, and produces Lightning Over-voltage in each equipment in high resistance loop.The disclosed high resistance of the application loop, destroys the insulation of equipment for fear of overvoltage, installed lightning arrester, to limit Lightning Over-voltage in described high resistance loop.
And, the anti-seismic performance of each equipment in high resistance loop, its geological process power with each connection device, be connected the factors such as gold utensil, tube connector bus, earthquake intensity and wind speed and have relation, need examine by test the anti-seismic performance in described high resistance loop.Due to setting and the larger-size reason in high resistance loop, the more difficult shock test of carrying out on vibration machine, therefore generally by modeling pattern, realizes overvoltage level to high resistance loop and the check of anti-seismic performance.
First, the overvoltage level in the high resistance loop in the disclosed transformer station of this programme is checked.By to the modeling of high resistance loop; and utilize voltage to check conventional usage and statistic law is carried out computational analysis to the overvoltage level in described high resistance loop; draw the conclusion that adopts the disclosed scheme of the utility model can meet the overvoltage protection requirement of relevant criterion or regulation and stipulation; that is to say; adopt the disclosed high resistance of the application loop, Lightning Incoming Wave can not work the mischief to each equipment.
Secondly, the overall anti-seismic performance in the high resistance loop in the disclosed transformer station of this programme is checked.By Modeling Calculation, determine the disclosed high resistance of the application loop, can meet the requirement of 8 degree earthquake territory engineering application completely, meanwhile, its anti-seismic performance is also far superior to disclosed high resistance loop in prior art.
The disclosed high resistance of the application loop, owing to having the advantage that shock resistance height is good, floor space is few and equipment investment is few, is with a wide range of applications, and can be applied in large quantities of ultra high voltage engineering constructions.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (6)

1. the high resistance loop in transformer station, is characterized in that, comprising:
The electric equipment sleeve pipe, lightning arrester, voltage transformer and the high resistance sleeve pipe that are set up in parallel;
Between described lightning arrester, voltage transformer and high resistance sleeve pipe, connect by the pipe bus that is arranged on top;
Described electric equipment sleeve pipe, by being arranged on the flexible conductor at top, is connected with the end of the extended described pipe bus in described lightning arrester top.
2. high resistance according to claim 1 loop, is characterized in that, described electric equipment sleeve pipe is:
Gas insulated combined electric appliance equipment sleeve pipe, or half gas insulated combined electric appliance equipment sleeve pipe.
3. high resistance according to claim 1 loop, is characterized in that,
Between described lightning arrester and described pipe bus, adopt fixing gold utensil to be connected;
Between described voltage transformer and described pipe bus, adopt slip gold utensil to be connected.
4. high resistance according to claim 1 loop, is characterized in that,
Described high resistance sleeve pipe, by flexible connection fitting, is realized and being connected with described pipe bus in the mode being flexible coupling.
5. high resistance according to claim 1 loop, is characterized in that,
The flexible conductor that connects the end of described electric equipment sleeve pipe and described pipe bus, the wire that is JLHN58K-1600 by four models forms jointly;
Wherein, described flexible conductor is by the mode being flexible coupling, and the end of the described pipe bus extending with described electric equipment sleeve pipe and described lightning arrester top is respectively realized and being connected.
6. high resistance according to claim 5 loop, is characterized in that,
Between described electric equipment sleeve pipe and described lightning arrester, the mode connecing with T by described flexible conductor realizes and being flexible coupling.
CN201320793414.5U 2013-11-22 2013-11-22 High impedance loop in transformer station Active CN203632009U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320793414.5U CN203632009U (en) 2013-11-22 2013-11-22 High impedance loop in transformer station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320793414.5U CN203632009U (en) 2013-11-22 2013-11-22 High impedance loop in transformer station

Publications (1)

Publication Number Publication Date
CN203632009U true CN203632009U (en) 2014-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320793414.5U Active CN203632009U (en) 2013-11-22 2013-11-22 High impedance loop in transformer station

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103730842A (en) * 2013-11-22 2014-04-16 国家电网公司 High-resistance loop in transformer substation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103730842A (en) * 2013-11-22 2014-04-16 国家电网公司 High-resistance loop in transformer substation
CN103730842B (en) * 2013-11-22 2016-06-29 国家电网公司 A kind of high-resistance loop in transformer station

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GR01 Patent grant
C56 Change in the name or address of the patentee
CP01 Change in the name or title of a patent holder

Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Patentee after: State Grid Corporation of China

Patentee after: CHINA POWER ENGINEERING CONSULTING (GROUP) CORPORATION

Patentee after: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE

Patentee after: Co., Ltd of Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Corporation

Patentee after: Co., Ltd of Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation

Patentee after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group

Patentee after: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP

Patentee after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd.

Patentee after: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP

Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Patentee before: State Grid Corporation of China

Patentee before: China Power Engineering Consulting Group Corporation

Patentee before: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE

Patentee before: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor

Patentee before: Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation

Patentee before: Huabei Power Design Inst., China Power Engineering Consulting Group

Patentee before: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation

Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation

Patentee before: North China Electric Power Design Institute of China Power Engineering Consulting Group Corporation