CN105788901B - Have and carry stepless capacity regulation switch - Google Patents
Have and carry stepless capacity regulation switch Download PDFInfo
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- CN105788901B CN105788901B CN201610041540.3A CN201610041540A CN105788901B CN 105788901 B CN105788901 B CN 105788901B CN 201610041540 A CN201610041540 A CN 201610041540A CN 105788901 B CN105788901 B CN 105788901B
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- capacity regulation
- contacts
- switch
- reactance
- adjustable magnetic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The present invention provides a kind of loaded switch that capacity transfer distribution transformer is enabled to realize stepless capacity regulation, mainly include adjustable magnetic sets of contacts, adjust reactance sets of contacts, adjust reactance that contact, adjustable magnetic is held to hold contact, switch controller, motor and transmission mechanism jointly jointly.Solves the big technological deficiency of existing loading capacitance-regulating distribution transformer switching electric current, it can be in a certain capacity section according to the arbitrary pondage of load, the problem of not limited by on-off times, and then being fully solved loading capacitance-regulating distribution transformer " low load with strong power ".
Description
Technical field
The present invention relates to a kind of loaded capacity-regulated switch, the intelligent stepless capacity regulation in especially a kind of Operation of Electric Systems is matched
Piezoelectric transformer is dedicated load stepless capacity regulation switch.
Background technology
Power distribution network quantity is big, area is wide, and distribution transformer is widely used, and the loss in power grid is lost in distribution transformer
In occupy considerable proportion.Therefore the drop damage of distribution transformer is directly related to the economic benefit of electric power enterprise and society.
Distribution transformer is mainly used for rural power grids and urban distribution network.Rural power grids load has seasonal strong, electricity consumption peak
The characteristics of paddy difference is big, and urban distribution network peak valley difference is more obvious, and its peak valley rotation is also more frequent.But in order to meet peak
Electricity consumption during load needs, and selects all to have to transformer is configured according to peak load during transformer.Which results in distribution
Transformer is often operated under underloading or light condition, is formed the situation of " low load with strong power ", is led to current China's distribution transformer
Device loss is quite serious, causes a large amount of unnecessary power resource wastes.
It counts and shows according to update：Total more than 3,000 hundred million kWh of energy loss of national whole year transformer, is equivalent in three
That waits electricity consumptions province uses the sum of power consumption；And the loss of distribution transformer accounts for about entire distribution system loss in medium voltage network
50%.With the growing tension of the energy and the rapid growth of electricity needs, how to maximize the energy consumption of saving distribution transforming becomes weight
It will be with urgent task.
Another aspect China town and country power distribution station and the power supply capacity of enterprise's transformer, with the electricity consumption rapidly increased not
It is disconnected to increase, it constantly carries out increasing the replacement of capacity so as to cause distribution transformer, causes the overlapping investment construction of power supply unit.
Form many unnecessary wastes.Although each electric company and user actively adopt measures, transformer capacity is only
One property can not change such waste again.
To solve the problems, such as " low load with strong power ", loaded capacity-regulated transformer obtains application in power distribution network in recent years.It can
To be automatically adjusted to run under due capacity by being downloaded from dynamic capacitance switch according to actual load size.Its energy-saving effect ratio
Common no-load capacitance-regulating transformer is notable.It may ensure that transformer operates in low capacity in farm slack season, and it can ensure it
During his underload also can automatic running in low capacity.It is readily applicable to single shift system factory and seasonal, intermittent unit demand
It uses.
Loaded capacity-regulated transformer usually has two capacity of size, passes through loaded capacity-regulated switch automatic adjustment operation.There is load
Capacitance-adjustable transformer operation principle is converted by transformer high-voltage winding Δ-Y, and low pressure winding string-simultaneously is converted to realize small- great Rong
What amount changed, the process that capacity changes is exactly the process of loaded capacity-regulated switching gear.
According to the parameter value of transformer before and after capacity transfer specified in Guo Wang incorporated businesses standard Q/GDW731-2012, then adjust
Hold front and rear capacity than the relationship for 0.3-0.32.The no-load loss of size and capacity presses the national normal value execution with capacity.For
Ensure the safe and reliable operation of loaded capacity-regulated transformer, it is necessary to set the capacity transfer point of safe size and capacity.According to document《Have
Optimum capacity adjusts point analysis and calculating in load capacitance-adjustable transformer operation》Calculating is 60% of low capacity or so.This is resulted in
More than 60% reduced-capacity load is run in high-power transformer.Therefore the problem of " low load with strong power " still without being fully solved.
And loaded capacity-regulated transformer realizes that the low-voltage lead series and parallel structure that small-large capacity changes is complicated, switching
Electric current is big, and very big risk is brought to transformer station high-voltage side bus, and there are larger hidden danger.It is used so being warned usually in switching declaration book
Family, should carry out switching less as possible, and daily switch motion number should be not more than 10 times.Loaded capacity-regulated transformer and its switch are cut
It is as shown in Figure 1 to change principle.K1, K2, K3, K4, K5 are switching switch in Fig. 1, totally 15, the switching of loaded capacity-regulated transformer capacity
15 switches is needed to be carried out at the same time switching manipulation.
Application for a patent for invention CN201510119406.6 (publication number CN104700998A) proposes a kind of intelligent stepless
Capacity transfer distribution transformer, several capacity sections are divided by distribution transformer capacity, carry out Design of Transformer by the capacity section of division.It should
Intelligent stepless capacity regulation distribution transformer needs to be switched by stepless capacity regulation while realized adjustable magnetic in operation and adjusts the function of reactance.
The present invention for above-mentioned needs, devise it is a kind of and meanwhile realize adjustable magnetic and adjust reactance, be exclusively used in it is intelligent stepless
Having for capacity transfer distribution transformer carries stepless capacity regulation switch.
Invention content
The present invention provides a kind of intelligent stepless capacity regulation transformer it is dedicated have carry stepless capacity regulation switch, with meet simultaneously
Adjustable magnetic and the needs for adjusting reactance function.Specific technical solution is as follows：
One kind, which has, carries stepless capacity regulation switch, for intelligent stepless capacity regulation transformer, mainly includes adjustable magnetic sets of contacts, adjusts electricity
Anti- sets of contacts adjusts reactance that contact, adjustable magnetic is held to hold contact, switch controller, motor and transmission mechanism jointly jointly.Transmission mechanism is
The bar or column structure being connected with motor shaft, transmission mechanism along itself it is axially vertical be provided with several pillars, reactance is adjusted to hold jointly
Contact and adjustable magnetic hold contact to be fixedly connected respectively with the pillar on transmission mechanism jointly.Adjustable magnetic sets of contacts and intelligent stepless capacity regulation
The different number of turn taps connection of transformer high-voltage coil.Adjust reactance sets of contacts and intelligent stepless capacity regulation transformer high-voltage coil
Different layers tap connects.
Adjust reactance that contact, adjustable magnetic is held to hold contact that insulation is set between the pillar of transmission mechanism respectively jointly jointly.
The present invention's has load stepless capacity regulation switch to further include shell, head cover, pressure relief device, filter core, air plug, oil level
Meter, nameplate.Wherein, head cover is fixed on the shell by the flange of cover top portion.Pressure relief device is arranged on head cover.Filter
Core, air plug, oil level indicator are arranged on side wall of outer shell, and are connected with enclosure.Nameplate is arranged on side wall of outer shell.
Head cover and shell form openable confined space, and insulating oil is filled inside confined space.
Pressure relief device is air pressure relief valve or replaceable masking foil.
Adjustable magnetic sets of contacts adjusts reactance sets of contacts to be arranged on the shell for carrying stepless capacity regulation switch.
Reactance is adjusted to hold contact, adjustable magnetic that contact is held to connect distribution transformer low-pressure side by air plug respectively jointly jointly to correspond to
Phase.
Motor is connect with switch controller.Switch controller is become by Aviation cable interface and intelligent stepless capacity regulation distribution
The master controller connection of depressor.
Switch controller is mainly by central processing unit, collecting unit, communication unit, input unit, output unit, control
Panel unit, power supply and crystal oscillator and clock circuit composition.
The present invention provides a kind of loaded switch that capacity transfer distribution transformer is enabled to realize stepless capacity regulation, solve existing
The big technological deficiency of some loading capacitance-regulating distribution transformer switching electric currents, can be arbitrary according to load in a certain capacity section
Pondage is not limited by on-off times, and then the problem of be fully solved loading capacitance-regulating distribution transformer " low load with strong power ".
Description of the drawings
Fig. 1 is loaded capacity-regulated transformer and its switching schematic diagram in the prior art.In figure：K1, K2, K3, K4, K5 are equal
For switching switch；
Fig. 2 is that having for the present invention carries the fragmentary sectional elevation view that stepless capacity regulation switchs；
Fig. 3 is the vertical view for the removing head cover that of the invention having shown in Fig. 2 carries stepless capacity regulation switch；
Fig. 4 is that of the invention having carries the sectional view along M-M that stepless capacity regulation switchs shown in Fig. 2；
Fig. 5 is that of the invention having carries the sectional view along Q-Q that stepless capacity regulation switchs shown in Fig. 2；
Fig. 6 is that having for the present invention carries the fundamental diagram that stepless capacity regulation switchs.In figure：A1-A5, B1-B5, C1-C5 is adjust
Reactance sets of contacts, X1-X5, Y1-Y5, Z1-Z5 are adjustable magnetic sets of contacts, and for reactance is adjusted to hold contact jointly, X, Y, Z are adjustable magnetic by W, U, V
Common end contact.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Close diagram and specific embodiment, the technical solution that the present invention is further explained.
As shown in Fig. 2, the present invention provides a kind of intelligent stepless capacity regulation transformer it is dedicated have carry stepless capacity regulation switch,
Mainly include adjustable magnetic sets of contacts, adjust reactance sets of contacts, adjust reactance that contact, adjustable magnetic is held to hold contact, switch controller jointly (not jointly
Diagram), motor and transmission mechanism.Adjustable magnetic sets of contacts number of turn tap different from intelligent stepless capacity regulation transformer high-voltage coil connects
It connects.Reactance sets of contacts is adjusted to be connect with the different layers tap of intelligent stepless capacity regulation transformer high-voltage coil.Adjustable magnetic sets of contacts is with adjusting
Reactance sets of contacts uses end pressure adjusting structure.
As shown in Figure 2,3, it is of the invention have carry stepless capacity regulation switch and further include shell, head cover, pressure relief device, filter
The components such as core, air plug, oil level indicator, nameplate.Wherein, head cover is fixed on the shell by the flange of cover top portion, head cover and shell
Form openable confined space, inside filling insulating oil.Pressure relief device is arranged on head cover, can be air pressure pressure release
The self-destructed disposables component such as valve or replaceable masking foil.Filter core, air plug, oil level indicator are arranged at side wall of outer shell
On, and connected with enclosure, corresponding function is realized respectively.Nameplate is arranged on side wall of outer shell.Due to cover top portion in Fig. 3
Flange blocks, and only shows the presence of each component in a schematic manner, and the true form of each component, construction belong to existing
Technology, those skilled in the art should be understood that.
As shown in Fig. 2, adjustable magnetic sets of contacts, tune reactance sets of contacts are arranged on the shell for carrying stepless capacity regulation switch.
Transmission mechanism is the bar being connected with motor shaft, column structure, transmission mechanism along itself it is axially vertical be provided with it is several
Pillar adjusts reactance to hold contact and adjustable magnetic that contact is held to be fixedly connected respectively with the pillar on transmission mechanism jointly jointly, and reactance is adjusted to be total to
Hold contact that insulation is set between the pillar of transmission mechanism respectively jointly with end contact, adjustable magnetic.Reactance is adjusted to hold contact, adjustable magnetic jointly
Common end contact connects distribution transformer low-pressure side by air plug respectively and corresponds to phase.
Motor is connect with switch controller.
Switch controller is connect (not by Aviation cable interface with the master controller of intelligent stepless capacity regulation distribution transformer
Diagram, the relevant technologies is the prior arts or can be found in CN104700998A), according to master controller instruction to the driver of switch
Structure, motor are controlled, and making two sets of sets of contacts, (adjustable magnetic sets of contacts adjusts reactance sets of contacts, reactance is adjusted to hold contact, adjustable magnetic common jointly
With end contact) it carries out suiting work.
The adjustable magnetic for carrying stepless capacity regulation switch be by the connection of adjustable magnetic sets of contacts different from high-tension coil number of turn tap come
It realizes.
According to Faraday's electromagnetic induction law：
It is constant in transformer input side electromotive force e, when high-tension coil number of turn N1 changes, alternating flux d ΦmTo change therewith
Become.N1 is small during large capacity, flux density ΦmIt is small；N1 increases during low capacity, flux density ΦmIncrease.The sky of each capacity in guaranteed capacity section
Load-loss is lower.
There are load stepless capacity regulation switch designs to introduce dynamic adjustable magnetic theory, under conditions of output no-load voltage qualification is ensured
Reach the flux density Φ for adjusting transformer magnetic circuit by the number of turn N1 for adjusting high-tension coilm.Each capacity in guaranteed capacity section
While no-load loss is lower, reliability of operation is improved.
In the present invention has the design for carrying stepless capacity regulation switch solution, the short circuit resistance of intelligent stepless capacity regulation distribution transformer
The anti-design using tune reactance adjusts reactance function by adjusting reactance sets of contacts to realize.
The tune reactance for carrying stepless capacity regulation switch is by the way that the different layers tap of reactance sets of contacts and high-tension coil is adjusted to connect
Come what is realized.Operation principle is as follows：
In formula：uk% short-circuit impedances；uka% resistance drops；ukx% reactance pressure drops.
In formula：F frequencies, Hz；I rated current, A；Total number of turns during W principal tappings (I, W are same side data in formula)；etPer circle
Potential, volt/circle；The average reactance height (during double winding) of two coils of H；f、ρ、K、H、etIt is constant.
Make ukx% stablizes, and only I*W* Σ D stablize.Rated current I is relatively small during low capacity, passes through adjustable magnetic sets of contacts tune
Section increases the number of turn W of coil, and reactance sets of contacts is adjusted to adjust reactance Σ D, jointly stabilizing ukx% values, short-circuit impedance also just receive control
System.
Stepless capacity regulation switch controller is mainly by central processing unit, collecting unit, communication unit, input unit, output
Unit, control panel unit, power supply and crystal oscillator and clock circuit composition (not shown).Its function is mainly：Acquisition is from nothing
Data, analytical judgment, record storage and transmission instruction of grade capacitance-adjustable transformer master controller etc..In order to improve the reliable of system
Property and antijamming capability, using technical grade chip, when circuit design, is abundant for all parts of stepless capacity regulation switch controller
Consider Electro Magnetic Compatibility, ensure reliability and the safety of control device, so as to meet the application demand under different severe environments.
By more than innovative design, the function admirable of product of the present invention.We in HWSWT-500-250/10 and
HWSWT-630-315/10 products are used, and have obtained effect well.With HWS11-630-315/10 product example technologies
Performance is as follows：
HWSWT-630-315/10 technical performance data
Stepless capacity regulation switchs the adjustable magnetic theory of common capacitance switch of changing, adjustable magnetic and adjust reactance all in high-voltage winding into
Row, and switch 1-2 points every time.(most 2 points) substantially increase reliability of operation.
By taking HWSWT-630-315/10 stepless capacity regulation transformers as an example, SWT-50/-5L stepless capacity regulations switch is selected, it is different
The switching of capacity is as follows：
630KVA-500KVA (being free of 500KVA) adjusts reactance contact to be connect with C1；Adjustable magnetic contact is connect with Z5；
500KVA-400KVA (being free of 400KVA) adjusts reactance contact to be connect with C1；Adjustable magnetic contact is connect with Z4；
400KVA-315KVA (being free of 315KVA) adjusts reactance contact to be connect with C2；Adjustable magnetic contact is connect with Z3；
315KVA adjusts reactance contact to be connect with C3 (containing 315KV and following)；Adjustable magnetic contact is connect with Z4.
The proprietary switch that stepless capacity regulation switch is intelligent stepless capacity regulation distribution transformer is carried, it can be according to transformer reality
Border payload carries out capacity gear adjusting, realizes capacity transfer tune impedance function, and dynamic can be adjusted when capacity gear is adjusted
Magnetic.Distribution transformer no-load loss is substantially reduced, thoroughly solves existing rural power grids power distribution station caused by seaonal load changes
The problem of transformer heavy overload and " low load with strong power ".
The research and development of stepless capacity regulation switch and production provide strong guarantor to stepless capacity regulation distribution transformer marketization production
Barrier.So that stepless capacity regulation distribution transformer can replace loading capacitance-regulating distribution transformer completely, certain can be realized automatically in a dynamic state
Stepless capacity regulation in one section of range of capacity, and no-load loss and load loss, less than national standard, energy-saving effect is notable, can meet
The requirement of town and country power load stage demand characteristics variation, capacity is realized than loaded capacity-regulated transformer by capacitance switch
Conversion will safety it is very much, substantially increase power supply reliability, have a vast market prospect.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improve and both fall in claimed right.
Claims (8)
1. one kind, which has, carries stepless capacity regulation switch, for intelligent stepless capacity regulation transformer, it is characterised in that：
Mainly include adjustable magnetic sets of contacts, adjust reactance sets of contacts, adjust reactance that contact, adjustable magnetic is held to hold contact, switch control jointly jointly
Device, motor and transmission mechanism；
Transmission mechanism is the bar or column structure being connected with motor shaft, transmission mechanism along itself it is axially vertical be provided with it is several
Column adjusts reactance to hold contact and adjustable magnetic that contact is held to be fixedly connected respectively with the pillar on transmission mechanism jointly jointly；
The number of turn tap connection different from intelligent stepless capacity regulation transformer high-voltage coil of adjustable magnetic sets of contacts；
Reactance sets of contacts is adjusted to be connect with the different layers tap of intelligent stepless capacity regulation transformer high-voltage coil；
Adjustable magnetic sets of contacts is with adjusting reactance sets of contacts to use end pressure adjusting structure；
Reactance is adjusted to hold contact, adjustable magnetic that contact is held to connect distribution transformer low-pressure side by air plug respectively jointly jointly and corresponds to phase.
2. one kind according to claim 1, which has, carries stepless capacity regulation switch, it is characterised in that：
Adjust reactance that contact, adjustable magnetic is held to hold contact that insulation is set between the pillar of transmission mechanism respectively jointly jointly.
3. one kind according to claim 1, which has, carries stepless capacity regulation switch, it is characterised in that：
There is load stepless capacity regulation switch to further include shell, head cover, pressure relief device, filter core, air plug, oil level indicator, nameplate；
Wherein, head cover is fixed on the shell by the flange of cover top portion；
Pressure relief device is arranged on head cover；
Filter core, air plug, oil level indicator are arranged on side wall of outer shell, and are connected with enclosure；
Nameplate is arranged on side wall of outer shell.
4. one kind according to claim 3, which has, carries stepless capacity regulation switch, it is characterised in that：
Head cover and shell form openable confined space, and insulating oil is filled inside confined space.
5. one kind according to claim 3, which has, carries stepless capacity regulation switch, it is characterised in that：
Pressure relief device is air pressure relief valve or replaceable masking foil.
6. one kind according to claim 1, which has, carries stepless capacity regulation switch, it is characterised in that：
Adjustable magnetic sets of contacts adjusts reactance sets of contacts to be arranged on the shell for carrying stepless capacity regulation switch.
7. one kind according to claim 1, which has, carries stepless capacity regulation switch, it is characterised in that：
Motor is connect with switch controller；
Switch controller is connect by Aviation cable interface with the master controller of intelligent stepless capacity regulation distribution transformer.
8. one kind according to claim 1, which has, carries stepless capacity regulation switch, it is characterised in that：
Switch controller is mainly by central processing unit, collecting unit, communication unit, input unit, output unit, control panel
Unit, power supply and crystal oscillator and clock circuit composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610041540.3A CN105788901B (en) | 2016-01-21 | 2016-01-21 | Have and carry stepless capacity regulation switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610041540.3A CN105788901B (en) | 2016-01-21 | 2016-01-21 | Have and carry stepless capacity regulation switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105788901A CN105788901A (en) | 2016-07-20 |
| CN105788901B true CN105788901B (en) | 2018-07-10 |
Family
ID=56402509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610041540.3A Active CN105788901B (en) | 2016-01-21 | 2016-01-21 | Have and carry stepless capacity regulation switch |
Country Status (1)
| Country | Link |
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| CN (1) | CN105788901B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109545527A (en) * | 2018-11-30 | 2019-03-29 | 合肥华威自动化有限公司 | A kind of stepless capacity regulation division phase-shifting transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2096121U (en) * | 1991-06-27 | 1992-02-12 | 南京化学工业(集团)公司催化剂厂 | Two-phase constant-power multistage on-load voltage regulating switch |
| CN2152285Y (en) * | 1993-05-10 | 1994-01-05 | 赵亚和 | Loaded tapping switch |
| CN104700998A (en) * | 2015-03-18 | 2015-06-10 | 合肥华威自动化有限公司 | Intelligent stepless capacitance-regulating power distribution transformer |
| CN205303221U (en) * | 2016-01-21 | 2016-06-08 | 合肥华威自动化有限公司 | There is stepless accent of carrying to hold switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62182815A (en) * | 1986-02-06 | 1987-08-11 | Toshiba Corp | Thyristor control type voltage phase controlled auto-transformer |
-
2016
- 2016-01-21 CN CN201610041540.3A patent/CN105788901B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2096121U (en) * | 1991-06-27 | 1992-02-12 | 南京化学工业(集团)公司催化剂厂 | Two-phase constant-power multistage on-load voltage regulating switch |
| CN2152285Y (en) * | 1993-05-10 | 1994-01-05 | 赵亚和 | Loaded tapping switch |
| CN104700998A (en) * | 2015-03-18 | 2015-06-10 | 合肥华威自动化有限公司 | Intelligent stepless capacitance-regulating power distribution transformer |
| CN205303221U (en) * | 2016-01-21 | 2016-06-08 | 合肥华威自动化有限公司 | There is stepless accent of carrying to hold switch |
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| Publication number | Publication date |
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| CN105788901A (en) | 2016-07-20 |
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Denomination of invention: On load stepless capacity regulating switch Effective date of registration: 20211119 Granted publication date: 20180710 Pledgee: Bank of Communications Ltd. Anhui branch Pledgor: HEFEI HUAWEI AUTOMATION Co.,Ltd. Registration number: Y2021980012807 |