CN207303936U - 3/2 wiring cant beam height of 500kV substations is across steering outlet structure - Google Patents
3/2 wiring cant beam height of 500kV substations is across steering outlet structure Download PDFInfo
- Publication number
- CN207303936U CN207303936U CN201721324511.4U CN201721324511U CN207303936U CN 207303936 U CN207303936 U CN 207303936U CN 201721324511 U CN201721324511 U CN 201721324511U CN 207303936 U CN207303936 U CN 207303936U
- Authority
- CN
- China
- Prior art keywords
- line
- cross
- upper strata
- cant beam
- corner
- 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.)
- Expired - Fee Related
Links
- 239000012212 insulator Substances 0.000 claims abstract description 41
- 238000012423 maintenance Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 35
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
3/2 wiring cant beam height of 500kV substations provided by the utility model is across steering outlet structure,Wherein W is mutually perpendicular to upper strata cross-line hanging wire crossbeam and N to upper strata cross-line hanging wire crossbeam,One end of W to upper strata cross-line is connected to W on the cross-line hanging wire crossbeam of upper strata,The other end is connected on the W sides insulator of upper strata corner cant beam,One end of N to upper strata cross-line is connected to N on the cross-line hanging wire crossbeam of upper strata,The other end is connected on the N sides insulator of upper strata corner cant beam,N is connected with W to the other end of upper strata cross-line to the other end of upper strata cross-line by upper strata corner cross-line,Outlet cross-line is connected in lower floor's string from outlet casing tube by lead on cross-line,Cross-line connects cross-line by levels and is connected to N to upper strata cross-line or W to upper strata cross-line in lower floor's string,W is connected to upper strata cross-line or N to upper strata cross-line by upper strata corner cross-line again,Realize and turn to outlet.The utility model preferred arrangement form on the premise of the money that saves land, easy access maintenance, and it is safe and reliable to operation.
Description
Technical field
A kind of outlet structure, more particularly to a kind of 3/2 wiring cant beam height of 500kV substations be the utility model is related to across steering
Outlet structure.
Background technology
500kV substations are generally load-center substation.Its main function and function in electric system is:1st, collect point
Basic routing line not from some power plants, and being connected with some key points in power network, at the same also with next step voltage
Power network is connected;2nd, the tie point of voltage electricity net at the highest level is accessed as large and medium-sized power plant;3rd, several hinge power transformations
With some basic routing lines composition main electric power net skeleton；4th, as the contact point between adjacent power system;5th, as under
The main power source of voltage order one power network.
The 500kV power distribution equipments of 500kV substations generally use 3/2 breaker connection（I.e. " one and half " connects
Line）, i.e. two component leads are access on two groups of busbares with three breakers, are powered, are connected to by 3/2 breaker per primary Ioops
The combination that 3 breakers of two groups of busbares and 2 elements are formed is accessed together referred to as " to go here and there ".3/2 breaker connection it is main excellent
Point includes property safe and reliable to operation height, scheduling is flexible, grid switching operation is convenient.
In recent years, China's economy develops rapidly, and society continues to increase the demand of electric power, large quantities of substation project projects
Start, as the progressively development of alternating current-direct current extra-high voltage, 500kV substations quantity are more and more.
500kV substation projects design the preferred arrangement that mostly important part is 500kV power distribution equipments area, how existing
Common power distribution equipment（AIS- opens wide the GIS that equipment, GIS- combined electrical apparatuses, HGIS- are free of busbar）On the basis of optimization 500kV set
The arrangement of preparation area, is the purpose of this project research.
China's land resource is extremely deficient, with the needs that the increase of society's electricity consumption amount and load develop, 500kV substations
Load center is increasingly closer to, becomes closer to dense population areas, and these regions are often in the high-quality location in city, soil money
Source is extremely precious.500kV substations are different from 220kV and 110kV, and since its voltage class is higher, equipment volume is huge, if
All using more than 3 times of AIS equipment, often 220kV substations floor space, but if all using GIS device, although
Floor space can significantly reduce, but equipment manufacturing cost can be significantly increased, therefore, for balancing equipment cost and floor space
Contradiction, current 500kV substations recommend to use HGIS equipment mostly, the advantage of the existing GIS of HGIS, and because its busbar opens wide
Arrangement, has AIS equipment arrangement clear, easy to the advantage of operating maintenance.
But using after HGIS equipment, if the station transmission line circuit is more, often there is outlet interval location saturation, cause
The situation that some outlet is blocked.To solve the problems, such as this, in Substation Design frequently with increase by one dedicated for outlet
Empty string interval, by the outlet being blocked by height across drawing the empty string being connected to dedicated for outlet.So although problem obtains
To solution, but serious waste land resource, a 500kV power distribution equipments area outgoing line interval width often in 27~29m, increase
Add an empty string to mean that 500kV battery limits lateral dimension increases nearly 30m, both waste valuable land resource,
Add the cost of framework.
Utility model content
The utility model provides a kind of increase on original framework and sets a connection intermediate frame and outlet structure diagonal
Cant beam, by the outlet cross-line being blocked by draw reach the standard grade be connected to connect the cant beam high cross-line, eventually through cant beam realize turn
It is existing in the prior art to solve the problems, such as to the framework of outlet.
The utility model uses following technical scheme：
3/2 wiring cant beam height of 500kV substations is upward to upper strata cross-line hanging wire crossbeam 1, N across steering outlet structure, including W
Layer cross-line hanging wire crossbeam 2, upper strata corner cant beam 3, N are to upper strata cross-line 4, W to upper strata cross-line 5, upper strata corner cross-line 6, levels
Cross-line 7, outlet casing tube 8, lead 9, cross-line 10 in lower floor's string are connected, W is hung to upper strata cross-line hanging wire crossbeam 1 and N to upper strata cross-line
Line crossbeam 2 is mutually perpendicular to, and two projections for upper strata corner cant beam 3 in the horizontal direction, and one end of W to upper strata cross-line 5 leads to
Cross insulator and be connected to W on the cross-line hanging wire crossbeam of upper strata, the other end is connected on the W sides insulator of upper strata corner cant beam 3, N
N is connected to on upper strata cross-line hanging wire crossbeam 2 by insulator to one end of upper strata cross-line 4, the other end is connected to upper strata corner
On the N sides insulator of cant beam 3, N passes through the other end from upper strata corner cross-line to upper strata cross-line 4 and W to the other end of upper strata cross-line 5
6 connections, outlet cross-line are connected to from outlet casing tube 8 by lead 9 in lower floor's string on cross-line 10, and cross-line 10 is by upper in lower floor's string
Lower floor's connection cross-line 7 is connected to N to upper strata cross-line 4 or W to upper strata cross-line 5, then by upper strata corner cross-line 6 to be connected to W upward
Layer cross-line 5 or N are realized to upper strata cross-line 4 and are turned to outlet.
One end connection N side insulators of the N to upper strata cross-line 4 of the upper strata corner cross-line 6, the other end connect W to upper strata
Cross-line W sides insulator.
N sides insulator and W sides insulator have identical structure, include：
Cylinder 64, multiple canopys 63 are socketed with cylinder 64, and one end of cylinder 64 passes through connector 62 and connects u shaped connector
61, u shaped connector 61 is connected on upper strata corner cant beam 3, and the both ends of cylinder 64 are connected to short starting rod 65 and long starting rod
66, ground loop 67 is also associated with cylinder 64.
The beneficial effects of the utility model：The utility model optimizes arrangement form on the premise of the money that saves land, and is easy to
Repair and maintenance, and it is safe and reliable to operation；The rolled steel dosage of framework is decreased, reduces the use of busbar and related gold utensil auxiliary material
Amount；For GIB busbar solutions, operating maintenance is more convenient, and cost contrast is dominant.
Brief description of the drawings
Fig. 1 is to be high across steering outlet schematic diagram（Outlet 2 is using cant beam height across steering）.
Fig. 2 is cant beam height across steering outlet floor map（Outlet 2 is using cant beam height across steering）.
Fig. 3 is Novel inclined deck-molding across steering outlet structure perspective view.
Fig. 4 is Novel inclined deck-molding across steering outlet plan（Lateral outlet cross-line is only shown, in dotted line frame）.
Fig. 5 is the A-A sectional schematic diagrams of Fig. 4.
Fig. 6 is the B-B sectional schematic diagrams of Fig. 4.
Fig. 7 is insulator schematic diagram.
Fig. 8 is water proof chip architecture.
Fig. 9 is canopy structure.
Wherein, 1-W is to upper strata cross-line hanging wire crossbeam, and 2-N is to upper strata cross-line hanging wire crossbeam, 3- upper stratas corner cant beam, 4-N to
Upper strata cross-line, 5-W connect cross-line, 8- outlet casing tubes, 9- leads, 10- to upper strata cross-line, 6- upper stratas corner cross-line, 7- levels
Cross-line in lower floor's string.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
For existing outlet saturation problem, the utility model provides one kind and increases piece connection of setting on original framework
Intermediate frame and the diagonal cant beam of outlet structure, by the outlet cross-line being blocked by draw reach the standard grade be connected to connect the cant beam it is high across
Line, realizes the 3/2 wiring cant beam height of 500kV substations for turning to outlet across steering outlet structure, the structure bag eventually through cant beam
It is upward to upper strata cross-line 4, W to upper strata cross-line hanging wire crossbeam 1, N to upper strata cross-line hanging wire crossbeam 2, upper strata corner cant beam 3, N to include W
Layer cross-line 5, upper strata corner cross-line 6, levels connection cross-line 7, outlet casing tube 8, lead 9, lower floor string in cross-line 10.
In orientation as described in Figure, W mutually hangs down to upper strata cross-line hanging wire crossbeam 1 and N to upper strata cross-line hanging wire crossbeam 2
Directly, and two for upper strata corner cant beam 3 in the horizontal direction project, and one end of W to upper strata cross-line 5 is connected to by insulator
To on upper strata cross-line hanging wire crossbeam 1, the other end is connected on the W sides insulator of upper strata corner cant beam 3 W, and N is to upper strata cross-line 4
One end is connected to N on upper strata cross-line hanging wire crossbeam 2 by insulator, and the other end is connected to the N sides insulation of upper strata corner cant beam 3
On son, N is connected to the other end and W of upper strata cross-line 4 to the other end of upper strata cross-line 5 by upper strata corner cross-line 6, upper strata corner
Cross-line 6 is fixed by N sides insulator and W sides insulator, sets special connection upper strata to turn no longer on upper strata corner cant beam 3
One end connection N side insulators of the N to upper strata cross-line 4 of the insulator of angle cross-line 6, i.e. upper strata corner cross-line 6, other end connection W
To the W sides insulator of upper strata cross-line 5.
When there is the increase of 500kV outlets scale, when causing to occur the situation that position is blocked, new outlet cross-line is from HGIS
After outlet casing tube 8 is connected in lower floor's string on cross-line 10 by lead 9, cross-line 10 connects cross-line 7 by levels in lower floor's string
N is connected to upper strata cross-line 4 or W to upper strata cross-line 5, then by upper strata corner cross-line 6 to be connected to W upward to upper strata cross-line 5 or N
Layer cross-line 4, realizes and turns to outlet.
Above-mentioned upper strata corner cross-line 6 is only fixed by N sides insulator and W sides insulator, therefore, to insulator
More demanding, therefore, the N sides insulator and W sides insulator that the utility model is connected on the cross-line cant beam of upper strata use following
Structure.
Insulator as shown in Figure 7, including cylinder 64, are socketed with multiple canopys 63 on cylinder 64, one end of cylinder 64 leads to
Cross connector 62 and connect u shaped connector 61, u shaped connector 61 is connected on upper strata corner cant beam 3, and the other end can according to different situations
Connection N is connected to short draw to upper strata cross-line 4, W to upper strata cross-line 5 or upper strata corner cross-line 6, the both ends of cylinder 64 respectively
Arc rod 65 and long starting rod 66, are also associated with ground loop 67 on cylinder 64.The setting of short starting rod 65 and long starting rod 66, can
Behind setting optimal discharge gap, when there is lightning stroke to occur, the power frequency arc of Xu Liu is set to be led to calcination at discharging gap, protection is exhausted
The safety of edge and conducting wire.And electrical verification ground connection during ground loop easy access.
As shown in figure 8, the canopy 63 of the utility model includes the arc canopy 31 of inner hollow, arc canopy lower part is column
Body 64, column body have a perforative perforation, and perforation is used to passing through metallic rod, and the cylinder of perforated outer is ceramic ring, arc canopy
31 edge is upturned to form the annular eaves gutter 32 of water guide, and the water for flowing into annular eaves gutter 32 for convenience smoothly flows out, annular
Water outlet 33 is provided with the edge of eaves gutter 32, the edge of water outlet 33 is bent downwardly, non-to be upturned, and the ring of water outlet
Guiding gutter is provided with the surface of shape eaves gutter 32, the water that annular eaves gutter 32 will be left on arc canopy 31 is collected into eaves gutter, by
Eaves gutter brim height at water outlet 33 is less than the height on 32 surface of eaves gutter, therefore the water in eaves gutter 32 is smooth from water outlet 33
Outflow, guiding gutter 36 can carry out water guide, facilitate water to flow out.
And the lower part of arc canopy 31 is provided with the connection sheet 35 for the silicone rubber material being connected with canopy inner surface, connection sheet
35 lower parts set the water-impermeable piece 34 for the silicone rubber material being connected with canopy inner surface, the portion that water-impermeable piece 34 is connected with canopy inner surface
Set up the downward annular water guide eaves gutter I 341 of groove separately, the part adjacent with cylinder 64 sets the downward annular water guide eaves of groove
Ditch II 342, water guide eaves gutter I 341 and water guide eaves gutter II 342 are both provided with water outlet, and two water outlets are oppositely arranged, between them
Connected by disposal ditches 343, and the outer edge of the water outlet 344 of water guide eaves gutter I 341 is less than the outer edge institute of water guide eaves gutter I 341
Horizontal plane, easy to carry out water guide in an inclined state.Water outlet 33 is identical with the position of water outlet 344, belongs to back-to-back
Water outlet.
When the utility model at work, installed after multiple insulators being worn string first, by the arc canopy 31 of insulator
For the water outlet 344 of water outlet 33 and water guide eaves gutter I 341 towards horizontal relatively low side, the rainwater for flowing through arc canopy passes through ring
After shape eaves gutter 32 is collected, flowed out by water outlet 33, and part rainwater enters at the undercut of arc canopy, at this time, some
Rainwater at this time, can be collected by water guide eaves gutter I 341 first possibly into insulator chain lower part, and rainwater it is larger or
In the case that the gradient of insulator chain is inadequate, it may appear that the situation that rainwater further inwardly flows, at this time, passes through water guide eaves gutter II
342 are collected, and are finally flowed out from water outlet 344, prevent rain water-harvesting in insulator chain bottom.Therefore, the utility model
Insulator can be easy to be collected and flow out by annular eaves gutter 32 and I 341 pairs of water guide eaves gutter II 342, water guide eaves gutter rainwater,
Prevent rainwater from staying on the insulator of lower part, effectively reduce the excessively electric risk of insulator and conducting wire, while pass through water guide eaves gutter I
341 with water guide eaves gutter II 342, can effectively avoid the generation of pylon electrification phenomenon.
Above-described is only the preferred embodiment of the utility model, it is noted that for those skilled in the art
For, under the premise of the utility model general idea is not departed from, some changes and improvements can also be made, these should also be considered as
The scope of protection of the utility model.
Claims (3)
- 3/2 wiring cant beam height of 1.500kV substations is across steering outlet structure, it is characterised in that：It is horizontal to upper strata cross-line hanging wire including W Beam（1）, N is to upper strata cross-line hanging wire crossbeam（2）, upper strata corner cant beam（3）, N is to upper strata cross-line（4）, W is to upper strata cross-line（5）, on Layer corner cross-line（6）, levels connection cross-line（7）, outlet casing tube（8）, lead（9）, lower floor string in cross-line（10）, W is to upper strata Cross-line hanging wire crossbeam（1）With N to upper strata cross-line hanging wire crossbeam（2）It is mutually perpendicular to, and is upper strata corner cant beam（3）In the horizontal direction On two projections, W is to upper strata cross-line（5）One end W is connected to upper strata cross-line hanging wire crossbeam by insulator（1）On, separately One end is connected to upper strata corner cant beam（3）W sides insulator on, N is to upper strata cross-line（4）One end N is connected to by insulator To upper strata cross-line hanging wire crossbeam（2）On, the other end is connected to upper strata corner cant beam（3）N sides insulator on, N is to upper strata cross-line （4）The other end and W to upper strata cross-line（5）The other end pass through upper strata corner cross-line（6）Connection, outlet cross-line is from outlet casing tube （8）Pass through lead（9）It is connected to cross-line in lower floor's string（10）On, cross-line in lower floor's string（10）Cross-line is connected by levels（7） N is connected to upper strata cross-line（4）Or W is to upper strata cross-line（5）, then pass through upper strata corner cross-line（6）W is connected to upper strata cross-line （5）Or N is to upper strata cross-line（4）, realize and turn to outlet.
- 2. 3/2 wiring cant beam height of 500kV substations according to claim 1 is across steering outlet structure, it is characterised in that：Institute State upper strata corner cross-line（6）One end connect N to upper strata cross-line（4）N sides insulator, the other end connects W to upper strata cross-line（5） W sides insulator.
- 3. 3/2 wiring cant beam height of 500kV substations according to claim 2 is across steering outlet structure, it is characterised in that：Institute Stating N sides insulator and W sides insulator has identical structure, includes：Cylinder（64）, cylinder（64）On be socketed with multiple canopys（63）, cylinder（64）One end pass through connector（62）Connect U-shaped Connector（61）, u shaped connector（61）It is connected to upper strata corner cant beam（3）On, cylinder（64）Both ends be connected to short starting rod （65）With long starting rod（66）, cylinder（64）On be also associated with ground loop（67）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721324511.4U CN207303936U (en) | 2017-10-16 | 2017-10-16 | 3/2 wiring cant beam height of 500kV substations is across steering outlet structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721324511.4U CN207303936U (en) | 2017-10-16 | 2017-10-16 | 3/2 wiring cant beam height of 500kV substations is across steering outlet structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207303936U true CN207303936U (en) | 2018-05-01 |
Family
ID=62415307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721324511.4U Expired - Fee Related CN207303936U (en) | 2017-10-16 | 2017-10-16 | 3/2 wiring cant beam height of 500kV substations is across steering outlet structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207303936U (en) |
-
2017
- 2017-10-16 CN CN201721324511.4U patent/CN207303936U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102611107A (en) | Urban medium-voltage power distribution network closed-loop power supply system based on annular net rack | |
| CN103362343B (en) | A kind of with tower six circuit pole tower | |
| CN202978006U (en) | Ultrahigh voltage intelligent substation medium-voltage side HGIS power distribution device | |
| CN104821490A (en) | 500 kV HGIS power distribution device arrangement structure | |
| CN104295147B (en) | A kind of framework being applicable to transformer station's outlet | |
| CN207303936U (en) | 3/2 wiring cant beam height of 500kV substations is across steering outlet structure | |
| CN204691375U (en) | The narrow base steel tube tower of a kind of 220kV tetra-return cable terminal | |
| CN207260730U (en) | A kind of double loop cable termination tower | |
| CN103354319B (en) | A kind of 220 kilovolts of outdoor GIS double-dragonfly-typoutlet outlet wire arrangement structure | |
| CN215119560U (en) | Single-pin joint-frame wire inlet and outlet structure of 110kV power distribution device | |
| CN201846015U (en) | GIS (global information system) power distribution unit adopting one and half breaker connection | |
| CN102891439A (en) | Medium-voltage side hybrid gas insulated switchgear (HGIS) distribution device for ultrahigh voltage intelligent substation | |
| CN105914590A (en) | GIS transformer station distribution wire outlet system | |
| CN201985528U (en) | Series compensation system adopting line iron towers | |
| CN205502701U (en) | 750kV and 330kV thoughtlessly press 0~20 angle tower in four return circuits | |
| CN207459404U (en) | Indoor GIS device roof outlet structure | |
| CN204258114U (en) | A kind of 500kV substation equipment arrangement | |
| CN207459403U (en) | A kind of vertical wire outlet structure of compact 330kV substations GIS | |
| CN203312636U (en) | Double-flying dragonfly outgoing line arranging structure of 220 kilovolt outdoor GIS | |
| CN204179673U (en) | A kind of dynamic passive compensation and DC ice melting multiplexer | |
| CN211183415U (en) | DC line reformed by same-tower double-circuit AC line | |
| CN210137183U (en) | Power transmission system | |
| CN107591684A (en) | A kind of 330kV transformer stations GIS vertical wire outlet structure | |
| CN207282908U (en) | The 500kV power distribution equipments arranged using half c-type | |
| CN205646451U (en) | Distribution system of being qualified for next round of competitions of GIS transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201102 Address after: 450000 9-18 / F, electric power building, 206 Zhongyuan West Road, Zhongyuan District, Zhengzhou City, Henan Province Patentee after: State Grid Henan energy Internet Electric Power Design Institute Co.,Ltd. Address before: Zhongyuan District Central Plains Road 450000 Henan city of Zhengzhou province No. 206 Patentee before: ZHENGZHOU ELECTRIC POWER DESIGN INSTITUTE OF CHINA ELECTRIC POWER EQUIPMENT AND TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180501 |