CN104269768B - Radome and the pole and solid insulation ring main unit using the radome - Google Patents
Radome and the pole and solid insulation ring main unit using the radome Download PDFInfo
- Publication number
- CN104269768B CN104269768B CN201410457309.3A CN201410457309A CN104269768B CN 104269768 B CN104269768 B CN 104269768B CN 201410457309 A CN201410457309 A CN 201410457309A CN 104269768 B CN104269768 B CN 104269768B
- Authority
- CN
- China
- Prior art keywords
- radome
- arc
- breaker
- connection seat
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 239000007787 solid Substances 0.000 title claims abstract description 20
- 239000004033 plastic Substances 0.000 claims abstract description 47
- 229920003023 plastic Polymers 0.000 claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 239000012212 insulator Substances 0.000 claims abstract description 41
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
Abstract
Pole and solid insulation ring main unit the present invention relates to radome and using the radome, pole includes insulator, the switch arc-chutes and arc-extinguishing chamber of circuit breaker of flexible link connection are provided with insulator, on insulator radome is covered with the periphery of the flexible link, radome includes the plastic body of annular, is poured into a mould in plastic body and is solidified with metal dust that is into a single integrated structure with plastic body and being conductively connected with the flexible link.During moulding by casting, metal dust has preferable mobility under the drive of plastics, thus radome can readily be shaped to required for it is variously-shaped, such radome can uses in pole, to be shielded to flexible link, flexible link point discharge is prevented.
Description
Technical field
Pole and solid insulation ring main unit the present invention relates to radome and using the radome.
Background technology
In high-tension switch gear such as in ring main unit, if by arc-chutes and disconnecting switch exposure in atmosphere, easily
The problem of in the presence of by the dust in the external world, moisture contamination, in order to avoid the influence of external environment condition, while improve the insulation of corresponding component
Performance is, it is necessary to which arc-chutes, the disconnecting switch conductive pieces sealing related to breaker is easily solidified epoxy resin is this kind of
Pole is formed in solid insulating material, makes the part of an entirety, referred to as pole, uses this pole
Ring main unit is referred to as solid insulation ring main unit.
Existing solid insulation ring main unit " a kind of solid insulation ring main unit " as disclosed in Chinese patent CN103166143A,
The solid insulation ring main unit includes cabinet and the pole that is arranged on cabinet, and pole includes insulator, in insulator
The first cavity and the second cavity being arranged side by side are provided with, the first cavity, the axial side of the second cavity are provided with the 3rd cavity,
The arc-extinguishing chamber of circuit breaker of breaker is placed in the first cavity, and the switch arc-chutes of disconnecting switch are placed in the second cavity, breaker
Insulating pull rod for breaker and the switch insulation pull bar of disconnecting switch be placed in the 3rd cavity, arc-extinguishing chamber of circuit breaker, switch arc extinguishing
One end that the 3rd cavity is closed in room is conductively connected by flexible link, arc-extinguishing chamber of circuit breaker, the other end difference for switching arc-chutes
It is provided with the orthogonal breaker connection seat of bearing of trend and arc-chutes junction block.Asked existing for existing this pole
Topic is：1st, metallic shield inherently not easy processing, and the processing of the radome of the irregular shape of non-revolved body is got up just more
Add difficulty, in pole, in order to reduce the usage amount of mould material, the cross sectional shape of the 3rd vestibule is rectangle, rectangular
The radome of shape is more difficult to process, and this, which is resulted in, to set metallic shield in the flexible link periphery of easy point discharge, made
Shield technology can not only be used by obtaining product, can not avoid point discharge problem；2nd, breaker connection seat and arc-chutes junction block are adopted
Orthogonal unsymmetric structure is taken, it is fixed to cause the installation site of breaker and disconnecting switch in ring main unit, such as
Say in some specific ring main unit, breaker is setting up and down with disconnecting switch, makes the mould of the insulator of the pole
Can use, when in another ring main unit, it is necessary to when breaker is arranged at below disconnecting switch, due to breaker connection seat and
The asymmetric setting of arc-chutes junction block, cause the versatility of insulator not strong, i.e., other insulator must be used to make mould
Tool just can be so that this can increase the cost of manufacture of product；3rd, the cavity wall of the 3rd cavity is that straight cavity wall causes the creep age distance of product to have
Limit, the creep age distance of product can only be increased by the length of the 3rd cavity of increase, this can cause the physical dimension of product larger,
The miniaturization for being unfavorable for pole and ring main unit makes；4th, the insulator of solid construction can also waste substantial amounts of mould material,
Increase the cost of product.
The content of the invention
It is an object of the invention to provide a kind of radome for being easy to shaping；The present invention also aims to provide one kind to make
With the pole and solid insulation ring main unit of the radome.
In order to solve the above problems, the technical scheme of solid insulation ring main unit is in the present invention：
Solid insulation ring main unit, including cabinet and the pole that sets thereon, pole include insulator, insulator
In be provided with the switch arc-chutes and arc-extinguishing chamber of circuit breaker of flexible link connection, in the outer of the flexible link on insulator
Shroud is provided with radome, and radome includes the plastic body of annular, in plastic body cast be solidified with integral with plastic body
Structure and the metal dust being conductively connected with the flexible link.
The fabrication hole for being flowed through during the insulator moulding by casting is offered on the body wall of plastic body.
The metal insert for realizing that metal dust is conductively connected with the flexible link is installed with the plastic body.
Switch arc-chutes, arc-extinguishing chamber of circuit breaker to arrange up and down, be provided with insulator and be connected with switching the static side of arc-chutes
Switch wire connection seat, be provided with the breaker connection seat being connected with the static side of arc-extinguishing chamber of circuit breaker, switch wire connection seat in insulator
With the setting symmetrical above and below of breaker connection seat.
The technical scheme of pole is in the present invention：
Pole, including insulator, switch arc-chutes and the open circuit of flexible link connection are provided with insulator
Device arc-chutes, are covered with radome on insulator in the periphery of the flexible link, and radome includes the plastic body of annular, modeling
Cast is solidified with metal dust that is into a single integrated structure with plastic body and being conductively connected with the flexible link in material body.
The fabrication hole for being flowed through during the insulator moulding by casting is offered on the body wall of plastic body.
Switch arc-chutes, arc-extinguishing chamber of circuit breaker to arrange up and down, be provided with insulator and be connected with switching the static side of arc-chutes
Switch wire connection seat, be provided with the breaker connection seat being connected with the static side of arc-extinguishing chamber of circuit breaker, switch wire connection seat in insulator
With the setting symmetrical above and below of breaker connection seat.
The technical scheme of radome is in the present invention：
Radome, include the plastic body of annular, in plastic body cast be solidified with it is into a single integrated structure with plastic body and
For the metal dust with being accordingly conductively connected by shielding part.
The fabrication hole for being flowed through during the insulator moulding by casting is offered on the body wall of plastic body.
It is installed with plastic body and realizes metal dust and the metal insert being conductively connected by shielding part.
Beneficial effects of the present invention are：During moulding by casting, metal dust has preferable under the drive of plastics
Mobility, thus radome can readily be shaped to required for it is variously-shaped, such radome can is in pole
Middle use, to be shielded to flexible link, prevent flexible link point discharge.
Brief description of the drawings
Fig. 1 is the use state figure of pole in one embodiment of solid insulation ring main unit in the present invention；
Fig. 2 is the structural representation of pole in Fig. 1；
Fig. 3 is the structural representation of the embodiment 1 of radome in the present invention, at the same be also in Fig. 1 the structure of radome show
It is intended to；
Fig. 4 is Fig. 3 top view；
Fig. 5 is Fig. 3 C-C to sectional view；
Fig. 6 is the structural representation of the embodiment 2 of radome in the present invention；
Fig. 7 is Fig. 6 A-A to sectional view；
Fig. 8 is Fig. 6 B-B direction sectional view.
Embodiment
The implementation of solid insulation ring main unit is for example shown in Fig. 1 ~ 5：Including cabinet（Not shown in figure）And what is set thereon consolidates
Sealed pole, pole include the insulator 1 that is made up of epoxy resin, be provided with insulator the first cavity for arranging up and down and
Second cavity, switch arc-chutes 8 are provided with the first cavity, are provided with arc-extinguishing chamber of circuit breaker 6 in the second cavity, in insulator in
The vertically extending switch wire connection seat receiving hole connected with the first cavity, switch wire connection are provided with the left of first cavity
Switch wire connection seat 9 is provided with seat receiving hole, switch wire connection seat 9 is connected with switching the static side of arc-chutes 8；In second in insulator
The vertically extending breaker connection seat receiving hole connected with the second cavity, breaker connection are provided with the left of cavity
Breaker connection seat 10 is provided with seat receiving hole, breaker connection seat 10 is connected with the static side of arc-extinguishing chamber of circuit breaker 6, and switch connects
Line seat and the setting symmetrical above and below of breaker connection seat, switch wire connection seat are coaxially set with breaker connection seat.In insulator in
Material reducing hole 12 is provided between first cavity and the second cavity.It is provided with insulator on the right side of the first cavity, the second cavity
3rd cavity 14, multi-turn and the integrally formed insulation convex edge of insulator are arranged at intervals with left-right direction in the cavity wall of the 3rd cavity
13, insulation convex edge can increase the creep age distance of product, so as to reduce the length of the 3rd cavity, to reduce the entirety of product
Size, the switch insulation pull bar 5 of disconnecting switch and the insulating pull rod for breaker 4 of breaker are located at 14 in the 3rd cavity, and switch is exhausted
The moved end of edge pull bar 5 and insulating pull rod for breaker 4 respectively with switch arc-chutes 8 and arc-extinguishing chamber of circuit breaker 6 is connected, and switchs arc extinguishing
Room, arc-extinguishing chamber of circuit breaker right-hand member between be conductively connected by flexible link 2, the periphery on insulator in flexible link is covered with
Radome 15, radome include plastic body, are poured into a mould in plastic body and be solidified with the metal powder into a single integrated structure with plastic body
End, metal dust are aluminium powder（Iron powder or other metal dusts）Though the radome formed by metal dust and plastic pouring solidification
With larger resistance, but conducting screen shield effectiveness can be realized, the end 17 of radome uses round and smooth spherical structure, prevents point
End electric discharge, pole also include solidifying into a single integrated structure metal insert 18 with plastic body upper, and metal insert is used for
With being that flexible link 2 is reliably connected by shielding part, the metal dust in plastic body is led by metal insert 18 with flexible link
Electrical connection, offers fabrication hole 16 on the cover body wall of radome, fabrication hole be available for epoxy resin to flow through with ensure epoxy resin with
Make radome and epoxy resin reliable connection during radome cast solidification.The surface of epoxy resin scribbles ground plane, can touch,
Security is good, and the ground plane of metallization can avoid alternate short trouble, safe.Figure middle term 3 represents plain cushion, spring pad
Circle；Item 7 represents the earth terminal of disconnecting switch；Item 11 represents conductive cushion blocks.
In use, radome elder generation moulding by casting, plastics, metal dust and metal insert solidification are into a single integrated structure during cast,
Using plastics and the radome of metal dust moulding by casting, radome is easy to be molded into any shape as needed, such as
The square structure used in the present embodiment, arc-extinguishing chamber of circuit breaker, switch arc-chutes, breaker connection seat, switch wire connection seat and
Radome is fixed in corresponding casting mold, is then integrated with poured with epoxy resin, and after injection forming to be poured, one is sprayed on surface
Layer metal ground plane, then by insulating pull rod for breaker, the assembling of switch insulation pull bar in the moved end of corresponding arc-chutes, two arc extinguishings
Connect to form complete galvanic circle by flexible link between room, the moved end of arc-extinguishing chamber of circuit breaker, the moved end for switching arc-chutes
It is in the tip of flexible link in radome, radome will play a part of the sophisticated electric field of shielding, so as to improve sealing pole
The integral insulation of post is horizontal, reaches shield effectiveness；The material reducing hole set between first cavity and the second cavity can reduce epoxy
The usage amount of resin, contribute to the further cost of manufacture for reducing product；Breaker connection seat and the symmetrical cloth of switch wire connection seat
Put so that when needing disconnecting switch to be located at below breaker, directly pole upset 180 degree can be used, sealing pole
The versatility of post greatly enhances, while also makes the layout inside ring main unit compacter；Insulation in the cavity wall of 3rd cavity is convex
Along the creep age distance that can increase pole, so as to effectively reduce the length of the 3rd cavity, and then product is reduced
Size.
In the other embodiments of this solid insulation epoxy cabinet：Material reducing hole can not also be set；Switch wire connection seat and breaker
Junction block can also be set in left-right direction；Fabrication hole on radome can not also be set；Metal insert on radome
It can not set, now need to set others to realize metal dust and the conducting by shielding part to connector.
The implementation of pole is for example shown in Fig. 1 ~ 5：The concrete structure of pole and above-mentioned each solid insulation ring main unit
Pole described in embodiment is identical, will not be described in detail herein.
The embodiment 1 of radome is as shown in Fig. 1 ~ 5：The concrete structure of radome is implemented with above-mentioned each solid insulation ring main unit
Radome described in example identical will not be described in detail herein.
The embodiment 2 of radome is as shown in Fig. 6 ~ 8：The radome uses suitable for other more complicated shielding environments,
Include the first cylinder 30, the second cylinder 32 and the connector drum 31 being connected between first, second cylinder of a short length, this reality
Apply example be intended to explanation by plastics and the radome that forms of metal dust cast can easily be shaped to needed for it is variously-shaped.
Claims (6)
1. solid insulation ring main unit, including cabinet and the pole that sets thereon, pole includes insulator, in insulator
It is provided with the switch arc-chutes and arc-extinguishing chamber of circuit breaker of flexible link connection, it is characterised in that：In described soft on insulator
The periphery of connector is covered with radome, and radome includes the plastic body of annular, in plastic body cast be solidified with and plastics
Body is into a single integrated structure and the metal dust that is conductively connected with the flexible link, is installed with the plastic body and realizes metal
The metal insert that powder is conductively connected with the flexible link, switch arc-chutes, arc-extinguishing chamber of circuit breaker are arranged up and down, in insulator
The switch wire connection seat being connected with switching the static side of arc-chutes is provided with, the static side phase with arc-extinguishing chamber of circuit breaker is provided with insulator
Breaker connection seat even, switch wire connection seat and the setting symmetrical above and below of breaker connection seat, switch wire connection seat and breaker connection
Seat is coaxially set, in use, radome elder generation moulding by casting, plastics, metal dust and metal insert solidification are integral during cast
Structure, using plastics and the radome of metal dust moulding by casting, radome is easy to be molded into required shape, and breaker goes out
Arc chamber, switch arc-chutes, breaker connection seat, switch wire connection seat and radome are fixed in corresponding casting mold, then use ring
Oxygen tree fat cast be integrated, after injection forming to be poured, layer of metal ground plane is sprayed on surface, then by insulating pull rod for breaker,
Switch insulation pull bar is assemblied in the moved end of corresponding arc-chutes.
2. solid insulation ring main unit according to claim 1, it is characterised in that：Confession is offered on the body wall of plastic body
The fabrication hole flowed through during the insulator moulding by casting.
3. pole, including insulator, the switch arc-chutes and breaker of flexible link connection are provided with insulator
Arc-chutes, it is characterised in that：Radome is covered with the periphery of the flexible link on insulator, radome includes the modeling of annular
Expect body, poured into a mould in plastic body and be solidified with metal that is into a single integrated structure with plastic body and being conductively connected with the flexible link
Powder, the metal insert for realizing that metal dust is conductively connected with the flexible link is installed with the plastic body, and switch goes out
Arc chamber, arc-extinguishing chamber of circuit breaker are arranged up and down, the switch wire connection seat being connected with switching the static side of arc-chutes are provided with insulator, absolutely
Be provided with the breaker connection seat being connected with the static side of arc-extinguishing chamber of circuit breaker in edge body, switch wire connection seat with breaker connection seat
Under be symmetrical arranged, switch wire connection seat is coaxially set with breaker connection seat, in use, radome elder generation moulding by casting, during cast
Plastics, metal dust and metal insert solidification are into a single integrated structure, using plastics and the radome of metal dust moulding by casting, shielding
Cover is easy to be molded into required shape, arc-extinguishing chamber of circuit breaker, switch arc-chutes, breaker connection seat, switch wire connection seat and screen
Cover cover to be fixed in corresponding casting mold, be then integrated with poured with epoxy resin, after injection forming to be poured, one layer is sprayed on surface
Metal ground plane, then by insulating pull rod for breaker, the assembling of switch insulation pull bar in the moved end of corresponding arc-chutes.
4. pole according to claim 3, it is characterised in that：Offered on the body wall of plastic body for described exhausted
The fabrication hole flowed through during edge body moulding by casting.
5. radome, it is characterised in that：Include the plastic body of annular, in plastic body cast be solidified with plastic body into one
Body structure and for the metal dust that is accordingly conductively connected by shielding part, be installed with plastic body and realize metal dust and institute
The metal insert being conductively connected by shielding part is stated, in use, radome elder generation moulding by casting, plastics, metal dust and gold during cast
It is into a single integrated structure to belong to inserts solidification, using plastics and the radome of metal dust moulding by casting, needed for radome is easy to be molded into
The shape wanted, arc-extinguishing chamber of circuit breaker, switch arc-chutes, breaker connection seat, switch wire connection seat and radome are fixed on and accordingly poured
In injection molding tool, then it is integrated with poured with epoxy resin, after injection forming to be poured, layer of metal ground plane is sprayed on surface, then
By insulating pull rod for breaker, the assembling of switch insulation pull bar in the moved end of corresponding arc-chutes.
6. radome according to claim 5, it is characterised in that：Offer on the body wall of plastic body and poured for insulator
The fabrication hole flowed through during injection forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410457309.3A CN104269768B (en) | 2014-09-10 | 2014-09-10 | Radome and the pole and solid insulation ring main unit using the radome |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410457309.3A CN104269768B (en) | 2014-09-10 | 2014-09-10 | Radome and the pole and solid insulation ring main unit using the radome |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104269768A CN104269768A (en) | 2015-01-07 |
| CN104269768B true CN104269768B (en) | 2017-12-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410457309.3A Active CN104269768B (en) | 2014-09-10 | 2014-09-10 | Radome and the pole and solid insulation ring main unit using the radome |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104269768B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111952051B (en) * | 2020-07-28 | 2022-04-22 | 国网河南省电力公司电力科学研究院 | Active defense internal discharge sulfur hexafluoride current transformer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19959450B4 (en) * | 1999-12-09 | 2005-10-27 | Elpro Gmbh Berlin-Industrieholding- | Electrical connector, which automatically fills with insulating gas during assembly of insulating gas filled switchgear components |
| CN201352894Y (en) * | 2008-11-07 | 2009-11-25 | 南通芯迎设计服务有限公司 | Electromagnetic shielding shell |
| CN101997273B (en) * | 2010-10-27 | 2012-06-13 | 北京双杰电气股份有限公司 | Insulating cover for solid insulating fully sealed switch |
| CN202678199U (en) * | 2012-07-23 | 2013-01-16 | 庞新显 | A high-voltage vacuum circuit breaker on an outdoor column |
| CN103166143B (en) * | 2012-12-24 | 2015-12-09 | 宁波优维电力科技有限公司 | A kind of solid insulation ring main unit |
| CN103151723A (en) * | 2013-04-07 | 2013-06-12 | 深圳市金博联电力技术有限公司 | Completely-sealed and complete-solid insulation ring main unit |
| CN103594950B (en) * | 2013-11-29 | 2016-06-08 | 麦克奥迪（厦门）电气股份有限公司 | The pole moved end shielding construction of solid insulation switch |
| CN204068008U (en) * | 2014-09-10 | 2014-12-31 | 平高集团有限公司 | A kind of radome and use pole and the solid insulation ring main unit of this radome |
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2014
- 2014-09-10 CN CN201410457309.3A patent/CN104269768B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104269768A (en) | 2015-01-07 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20160105 Address after: South East of Pingdingshan city in Henan province 467001 No. 22 Applicant after: Pinggao Group Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: Henan high General Electric Co., Ltd. Address before: South East of Pingdingshan city in Henan province 467001 No. 22 Applicant before: Pinggao Group Co., Ltd. Applicant before: State Grid Corporation of China |
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