CN203684776U - Plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure - Google Patents
Plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure Download PDFInfo
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- CN203684776U CN203684776U CN201320862818.5U CN201320862818U CN203684776U CN 203684776 U CN203684776 U CN 203684776U CN 201320862818 U CN201320862818 U CN 201320862818U CN 203684776 U CN203684776 U CN 203684776U
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Abstract
The utility model provides a plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure. The structure comprises a tower foot bottom plate, a first shoe plate, a second shoe plate, a third shoe plate and stiffening plates, wherein the first shoe plate, the second shoe plate and the third shoe plate are welded to the tower foot bottom plate; the second shoe plate and the third shoe plate are welded to the two sides of the first shoe plate; the second shoe plate and the third shoe plate are perpendicular to the first shoe plate in the same plane; an included angle between each of the second shoe plate and the third shoe plate is equal to that between the first shoe plate and the tower foot bottom plate; the stiffening plates are respectively arranged on the first shoe plate, the second shoe plate and the third shoe plate. The plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure adopts a mode that the tower foot principal material is in bolted connection with the shoe plates to replace a mode that in the prior art the tower foot principal material is directly welded with the tower foot bottom plate. The shoe plate connection mode simplifies the tower foot construction, reduces the processing difficulty, lowers weight of a tower, and further is beneficial to transportation and installation of a transmission line tower.
Description
Technical field:
The utility model relates to iron tower of power transmission line technical field, is specifically related to one ± 800kV UHVDC Transmission Lines boots board connecting structure.
Background technology:
For the electric energy that allows Energy Base produce reduces loss in the process that is transported to electricity needs center, improve transmission of electricity quality, China is building UHV transmission line at present energetically.
UHV transmission line, refer to electric pressure 1000kV and above transmission line of alternation current and ± 800kV and above DC power transmission line.At present, China ± 800kV extra high voltage direct current transmission line engineering mainly adopts angle steel tower to carry out overhead power transmission.
Angle steel tower is the same with other conventional shaft tower types, is divided into tower head, tower body, tower leg and column foot.Angle steel tower column foot is a kind of syndeton being welded by plate, and upper end connects tower leg, and lower end connects the iron tower foundation being embedded in ground, reaches iron tower foundation for steel tower superstructure is transmitted to the power of getting off.UHVDC Transmission Lines angle steel tower column foot generally directly welded tower leg main material and column foot base plate in the past, because tower leg main material is generally very long, for ease of processing and installation, can not be by elongated whole tower leg main material and the welding of column foot base plate, therefore tower leg main material must be cut-off, breaking point operated by rotary motion is at the most next internode of tower leg.This causes tower leg main material to increase a joint, and tower weight increases; Assemble smoothly in order to ensure column foot, this structural shape requires strictly to control well precision in the time of processing welding, ensureing column foot base plate and the basic end face laminating while closely, also will ensure that next saves main material consistent with the main material gradient in top, therefore difficulty of processing is larger; In addition, because its whole size is larger, weight is heavier, and transport is installed all inconvenient; Except this, this structural shape must weld stiffener in tower leg main material bottom, and welding job amount is also larger, and weld seam is more, in cold district, also can increase potential safety hazard.
Visible, there is all drawbacks in tower leg main material and column foot base plate directly traditional connected mode of welding, therefore, needs a kind of new connection pattern of exploitation badly, to reduce difficulty of processing, ensures crudy, guarantees that steel tower assembles and move smoothly, safely.
Utility model content:
The purpose of this utility model is to overcome processing difficulties, main material joint that column foot tectonic type in prior art exists and increases and the shortcomings such as inconvenience are installed, one ± 800kV UHVDC Transmission Lines boots board connecting structure is provided, not only simple structure of this boots board connecting structure, reasonable stress, and economy attractive in appearance.
For achieving the above object, the utility model adopts following technical scheme:
One ± 800kV UHVDC Transmission Lines boots board connecting structure, comprise column foot base plate, the first boots plate, the second boots plate and the 3rd boots plate, wherein, on described column foot base plate, be provided with some anchor (bolt) holes, described the first boots plate, the second boots plate and the 3rd boots plate are welded on column foot base plate, and the second boots plate and the 3rd boots plate are welded on the both sides of the first boots plate, the second boots plate and the 3rd boots plate are at grade perpendicular to the first boots plate, the second boots plate and the 3rd boots plate equate with the angle of column foot base plate with the first boots plate with the angle of column foot base plate, on the first boots plate, be provided with first group of main material connecting hole, the 3rd group of main material connecting hole and first group of oblique material connecting hole, on the second boots plate, be provided with the 4th group of main material connecting hole, on the 3rd boots plate, be provided with second group of main material connecting hole and second group of oblique material connecting hole, first group of main material connecting hole and first group of oblique material connecting hole respectively with second group of main material connecting hole and the second group of oblique material connecting hole center line symmetry about the first boots plate and the 3rd boots plate holder angle, the 3rd group of main material connecting hole and the 4th group of main material connecting hole are about the center line symmetry at the first boots plate and the second boots plate holder angle, described the first boots plate, on the second boots plate and the 3rd boots plate, be respectively arranged with stiffener.
The utility model further improves and is: described stone bolt hole number is 8, and evenly arranges along column foot base plate.
The utility model further improves and is: described the first boots plate is arranged on the lateral symmetry axle of column foot base plate, and the second boots plate and the 3rd boots plate are arranged on longitudinal axis of symmetry of column foot base plate.
The utility model further improves and is: first group of main material connecting hole, second group of main material connecting hole, the 3rd group of main material connecting hole and the 4th group of main material connecting hole are two row.
The utility model further improves and is: first group of oblique material connecting hole and second group of oblique material connecting hole are two row.
The utility model further improves and is: the weld of the first boots plate, the second boots plate, the 3rd boots plate and stiffener is provided with groove.
The utility model further improves and is: described stiffener is perpendicular to the first boots plate, the second boots plate or the 3rd boots plate.
The utility model further improves and is: described stiffener comprises the first stiffener of two pairs of supporting settings and the second stiffener of the 3rd stiffener and two pairs of supporting settings and the 4th stiffener, the first stiffener of two pairs of supporting settings and the 3rd stiffener are symmetrical arranged about the center line at the first boots plate and the second boots plate holder angle, and the second stiffener of two pairs of supporting settings and the 4th stiffener are symmetrical arranged about the center line at the first boots plate and the 3rd boots plate holder angle.
Compared with prior art, the utlity model has following technique effect:
The pattern that this adopts novel one ± 800kV UHVDC Transmission Lines boots board connecting structure to adopt tower leg main material and boots plate to be bolted, tower leg main material and the directly pattern of welding of column foot base plate in prior art are substituted, this boots board attachment-type formula has been simplified column foot structure, reduce difficulty of processing, reduce tower weight, and then be conducive to transport and the installation of iron tower of power transmission line.
Brief description of the drawings:
Fig. 1 is the scheme of installation of the utility model one ± 800kV UHVDC Transmission Lines boots board connecting structure.
Fig. 2 is the top view of Fig. 1 at A-A place.
Wherein: 1, column foot base plate; 2a, the first boots plate; 2b, the second boots plate; 2c, the 3rd boots plate; 3a, the first stiffener; 3b, the second stiffener; 3c, the 3rd stiffener; 3d, the 4th stiffener; 4, tower leg main material; 5, the oblique material of tower leg; 6a, first group of main material connecting hole; 6b, second group of main material connecting hole; 6c, the 3rd group of main material connecting hole; 6d, the 4th group of main material connecting hole; 6e, first group of oblique material connecting hole; 7, anchor (bolt) hole.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, one ± 800kV UHVDC Transmission Lines boots board connecting structure, comprises column foot base plate 1, the first boots plate 2a, the second boots plate 2b, the 3rd boots plate 2c and stiffener.
Wherein, column foot base plate 1 is regular polygon, on it, be evenly provided with 8 anchor (bolt) holes 7, the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c are irregular polygon, the first boots plate 2a is welded on the lateral symmetry axle of column foot base plate 1, the second boots plate 2b and the 3rd boots plate 2c tilt to be welded on longitudinal axis of symmetry of column foot base plate 1, and the second boots plate 2b and the 3rd boots plate 2c are welded on the both sides of the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c are at grade perpendicular to the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c equate with the angle of column foot base plate 1 with the first boots plate 2a with the angle of column foot base plate 1, thereby, the first boots plate 2a and the second boots plate 2b and the spliced shape symmetry of the 3rd boots plate 2c.
On the first boots plate 2a, be provided with first group of main material connecting hole 6a, the 3rd group of main material connecting hole 6c and first group of oblique material connecting hole 6e, on the second boots plate 2b, be provided with the 4th group of main material connecting hole 6d, on the 3rd boots plate 2c, be provided with second group of main material connecting hole 6b and second group of oblique material connecting hole, first group of main material connecting hole 6a and first group of oblique material connecting hole 6e respectively with second group of main material connecting hole 6b and the second group of oblique material connecting hole center line symmetry about the first boots plate 2a and the 3rd boots plate 2c angle, the 3rd group of main material connecting hole 6c and the 4th group of main material connecting hole 6d are about the center line symmetry of the first boots plate 2a and the second boots plate 2b angle, and, first group of main material connecting hole 6a, second group of main material connecting hole 6b, the 3rd group of main material connecting hole 6c and the 4th group of main material connecting hole 6d are two row, first group of oblique material connecting hole 6e and second group of oblique material connecting hole are also two row.
In addition, on the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c, be respectively arranged with stiffener, it is welded on the first boots plate 2a, the second boots plate 2b, the 3rd boots plate 2c and column foot base plate 1.Wherein, stiffener comprises the first stiffener 3a of two pairs of supporting settings and the second stiffener 3b of the 3rd stiffener 3c and two pairs of supporting settings and the 4th stiffener 3d, the first stiffener 3a of two pairs of supporting settings and the 3rd stiffener 3c are symmetrical arranged about the center line of the first boots plate 2a and the second boots plate 2b angle, and the second stiffener 3b of two pairs of supporting settings and the 4th stiffener 3d are symmetrical arranged about the center line of the first boots plate 2a and the 3rd boots plate 2c angle.Arranging of stiffener strengthens supporting role to column foot base plate 1, reduce the thickness of column foot base plate 1, ensure local stability when the first boots plate 2a, the second boots plate 2b or the 3rd boots plate 2c are stressed simultaneously, stiffener and the first boots plate 2a, the second boots plate 2b, the 3rd boots plate 2c and 1 collaborative work of column foot base plate ensure that column foot can be stablized, operation safely, take into account economic benefit simultaneously.
In addition, this stiffener is perpendicular to the first boots plate 2a, the second boots plate 2b or the 3rd boots plate 2c, and the weld of the first boots plate 2a, the second boots plate 2b, the 3rd boots plate 2c and stiffener is provided with groove, this groove can reduce Size of welds, and then make column foot structural configuration compactness, reduce the size of column foot base plate 1, further reduce tower weight.
The utility model one ± 800kV UHVDC Transmission Lines boots board connecting structure, when mounted, two oblique materials 5 of tower leg are connected with the second boots plate 2b with the first boots plate 2a by two row bolts respectively; Tower leg main material 4 is two combination angle steel, its cross section is cross, have four legs of angle, each leg of angle is provided with two row and amounts to 11 bolts hole, and four legs of angle are all connected with the 3rd boots plate 2c with the first boots plate 2a being cross-shaped cross, the second boots plate 2b respectively by two row bolts.
In the utility model, the center of gravity line of tower leg main material 4 is by the right-angled intersection point of the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c, therefore the right-angled intersection point of the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c is arranged to the center of column foot base plate 1, simultaneously on column foot base plate 1 about Central Symmetry be provided with eight anchor (bolt) holes 7, angle of distribution is 22.5 degree, to improve the stressed of whole column foot structure.
In above-described embodiment, the angle of the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c and column foot base plate 1 equals the inclination angle of tower leg main material 4.Column foot base plate 1 is and is horizontally disposed with, and is applicable to flat-top basis; When for oblique top basis, the angle of the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c and column foot base plate 1 is set to right angle.
In the utility model, steel tower superstructure is transmitted the power of getting off, can reach the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c by bolt by tower leg main material 4 and the oblique material 5 of tower leg, reach column foot base plate 1 by the first boots plate 2a, the second boots plate 2b and the 3rd boots plate 2c again, finally reach iron tower foundation by column foot base plate 1, thereby meet the functional requirement of column foot power transmission.
Adopt after the utility model boots board attachment-type formula, the directly elongated end face that extends column foot base plate 1 of tower leg main material 4 with the main material 4 of other tower bodies, can not cut-off within the scope of length restriction.Therefore, can cancel conventional tower pin and connect in pattern when tower leg main material 4 welds with column foot base plate 1 because constructing a joint former thereby that must set up, thereby reduce tower weight.
Under normal circumstances, as the first boots plate 2a, when the second boots plate 2b and the 3rd boots plate 2c and column foot base plate 1 weld, the first boots plate 2a, between the second boots plate 2b and the 3rd boots plate 2c and column foot base plate 1, must ensure certain inclination angle, the size at this inclination angle equates with the inclination angle of tower leg main material 4, compared with the mode of directly welding with column foot base plate 1 with the tower leg main material 4 in traditional column foot pattern, the utility model the first boots plate 2a, the inclination angle of the second boots plate 2b and the 3rd boots plate 2c and column foot base plate 1 is relatively easily controlled adding man-hour, and welding job amount reduces, thereby reduce difficulty of processing, due to reducing of the utility model scantling and weight, transport and installation are also more for convenience.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model; can not assert that detailed description of the invention of the present utility model only limits to this; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; can also make some simple deduction or replace, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.
Claims (8)
1. one kind ± 800kV UHVDC Transmission Lines boots board connecting structure, it is characterized in that: comprise column foot base plate (1), the first boots plate (2a), the second boots plate (2b) and the 3rd boots plate (2c), wherein, on described column foot base plate (1), be provided with some anchor (bolt) holes (7), described the first boots plate (2a), the second boots plate (2b) and the 3rd boots plate (2c) are welded on column foot base plate (1), and the second boots plate (2b) and the 3rd boots plate (2c) are welded on the both sides of the first boots plate (2a), the second boots plate (2b) and the 3rd boots plate (2c) are at grade perpendicular to the first boots plate (2a), the second boots plate (2b) and the 3rd boots plate (2c) equate with the angle of column foot base plate (1) with the first boots plate (2a) with the angle of column foot base plate (1), on the first boots plate (2a), be provided with first group of main material connecting hole (6a), the 3rd group of main material connecting hole (6c) and first group of oblique material connecting hole (6e), on the second boots plate (2b), be provided with the 4th group of main material connecting hole (6d), on the 3rd boots plate (2c), be provided with second group of main material connecting hole (6b) and second group of oblique material connecting hole, first group of main material connecting hole (6a) and first group of oblique material connecting hole (6e) respectively with second group of main material connecting hole (6b) and the second group of oblique material connecting hole center line symmetry about the first boots plate (2a) and the 3rd boots plate (2c) angle, the 3rd group of main material connecting hole (6c) and the center line symmetry of the 4th group of main material connecting hole (6d) about the first boots plate (2a) and the second boots plate (2b) angle, described the first boots plate (2a), on the second boots plate (2b) and the 3rd boots plate (2c), be respectively arranged with stiffener.
2. as claimed in claim 1 ± 800kV UHVDC Transmission Lines boots board connecting structure, is characterized in that: described anchor (bolt) hole (7) quantity is 8, and evenly arranges along column foot base plate (1).
3. as claimed in claim 1 ± 800kV UHVDC Transmission Lines boots board connecting structure, it is characterized in that: described the first boots plate (2a) is arranged on the lateral symmetry axle of column foot base plate (1), the second boots plate (2b) and the 3rd boots plate (2c) are arranged on longitudinal axis of symmetry of column foot base plate (1).
4. as claimed in claim 1 ± 800kV UHVDC Transmission Lines boots board connecting structure, is characterized in that: first group of main material connecting hole (6a), second group of main material connecting hole (6b), the 3rd group of main material connecting hole (6c) and the 4th group of main material connecting hole (6d) are two row.
5. as claimed in claim 1 ± 800kV UHVDC Transmission Lines boots board connecting structure, is characterized in that: first group of oblique material connecting hole (6e) and second group of oblique material connecting hole are two row.
6. as claimed in claim 1 ± 800kV UHVDC Transmission Lines boots board connecting structure, is characterized in that: the weld of the first boots plate (2a), the second boots plate (2b), the 3rd boots plate (2c) and stiffener is provided with groove.
7. as claimed in claim 6 ± 800kV UHVDC Transmission Lines boots board connecting structure, is characterized in that: described stiffener is perpendicular to the first boots plate (2a), the second boots plate (2b) or the 3rd boots plate (2c).
8. as claimed in claim 7 ± 800kV UHVDC Transmission Lines boots board connecting structure, it is characterized in that: described stiffener comprises first stiffener (3a) of two pairs of supporting settings and second stiffener (3b) of the 3rd stiffener (3c) and two pairs of supporting settings and the 4th stiffener (3d), first stiffener (3a) of two pairs of supporting settings and the 3rd stiffener (3c) are symmetrical arranged about the first boots plate (2a) and the center line of the second boots plate (2b) angle, second stiffener (3b) of two pairs of supporting settings and the 4th stiffener (3d) are symmetrical arranged about the first boots plate (2a) and the center line of the 3rd boots plate (2c) angle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320862818.5U CN203684776U (en) | 2013-12-20 | 2013-12-20 | Plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320862818.5U CN203684776U (en) | 2013-12-20 | 2013-12-20 | Plus/minus 800 kV extra-high voltage direct-current transmission line shoe plate connecting structure |
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| CN203684776U true CN203684776U (en) | 2014-07-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295146A (en) * | 2014-10-18 | 2015-01-21 | 福州万山电力咨询有限公司 | Compositional structure of angle tower for 110kV line engineering |
| CN104453337A (en) * | 2014-11-18 | 2015-03-25 | 国网安徽省电力公司阜阳供电公司 | Angle steel tower foot |
| CN104594699A (en) * | 2015-02-05 | 2015-05-06 | 中国电力工程顾问集团西南电力设计院有限公司 | Tower foot joint for section of non-filler plate four-piece combined angle steel of power transmission tower |
| CN105117577A (en) * | 2015-07-13 | 2015-12-02 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating specification of eight-anchor-bolt rigid tower base plate for power transmission tower |
| CN105113840A (en) * | 2015-07-13 | 2015-12-02 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating specifications of flexible tower baseplate with eight anchor bolts for power transmission towers |
| CN107102991A (en) * | 2016-02-19 | 2017-08-29 | 中国电力科学研究院 | A kind of shaft tower parametric modeling method in three-dimension GIS system |
| CN109235918A (en) * | 2018-10-12 | 2019-01-18 | 广州增立钢管结构股份有限公司 | A kind of wind resistance reinforcement and strengthening structure of electric power pylon |
| CN110014242A (en) * | 2019-04-29 | 2019-07-16 | 中电建武汉铁塔有限公司 | Electric power pylon column foot welding procedure |
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2013
- 2013-12-20 CN CN201320862818.5U patent/CN203684776U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295146A (en) * | 2014-10-18 | 2015-01-21 | 福州万山电力咨询有限公司 | Compositional structure of angle tower for 110kV line engineering |
| CN104295146B (en) * | 2014-10-18 | 2016-06-08 | 福州万山电力咨询有限公司 | 110kV line project improvement corner tower composition structure |
| CN104453337A (en) * | 2014-11-18 | 2015-03-25 | 国网安徽省电力公司阜阳供电公司 | Angle steel tower foot |
| CN104594699A (en) * | 2015-02-05 | 2015-05-06 | 中国电力工程顾问集团西南电力设计院有限公司 | Tower foot joint for section of non-filler plate four-piece combined angle steel of power transmission tower |
| CN105117577A (en) * | 2015-07-13 | 2015-12-02 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating specification of eight-anchor-bolt rigid tower base plate for power transmission tower |
| CN105113840A (en) * | 2015-07-13 | 2015-12-02 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating specifications of flexible tower baseplate with eight anchor bolts for power transmission towers |
| CN105113840B (en) * | 2015-07-13 | 2017-05-10 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating specifications of flexible tower baseplate with eight anchor bolts for power transmission towers |
| CN105117577B (en) * | 2015-07-13 | 2017-12-01 | 中国电力工程顾问集团中南电力设计院有限公司 | Eight foundation bolt rigid tower seat board specification computational methods of electric power pylon |
| CN107102991A (en) * | 2016-02-19 | 2017-08-29 | 中国电力科学研究院 | A kind of shaft tower parametric modeling method in three-dimension GIS system |
| CN109235918A (en) * | 2018-10-12 | 2019-01-18 | 广州增立钢管结构股份有限公司 | A kind of wind resistance reinforcement and strengthening structure of electric power pylon |
| CN110014242A (en) * | 2019-04-29 | 2019-07-16 | 中电建武汉铁塔有限公司 | Electric power pylon column foot welding procedure |
| CN110014242B (en) * | 2019-04-29 | 2021-07-30 | 中电建武汉铁塔有限公司 | Welding process for tower foot of power transmission tower |
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Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. 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 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: Co., Ltd of Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Corporation 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: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee before: State Grid Corporation of China Patentee before: China Power Engineering Consulting Group Corporation Patentee before: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE 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: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor 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 |