CN206292583U - Fault treating apparatus and system - Google Patents
Fault treating apparatus and system Download PDFInfo
- Publication number
- CN206292583U CN206292583U CN201621377566.7U CN201621377566U CN206292583U CN 206292583 U CN206292583 U CN 206292583U CN 201621377566 U CN201621377566 U CN 201621377566U CN 206292583 U CN206292583 U CN 206292583U
- Authority
- CN
- China
- Prior art keywords
- fault
- module
- treating apparatus
- data
- power cell
- 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.)
- Active
Links
Abstract
The utility model provides a kind of fault treating apparatus and system.The fault treating apparatus include：Data acquisition module, breakdown judge module and the control signal generation module being sequentially connected；The floor data of data collecting module collected power cell；Breakdown judge module receives floor data, judges whether power cell breaks down according to floor data, and when power cell failure is judged, floor data is compared with default floor data threshold value, it is determined that corresponding fault level；Control signal generation module is generated for indicating to perform the control signal that corresponding failure protection is operated according to the fault level for receiving.Fault treating apparatus of the present utility model and system, realize when failure occurs for the power cell of Modularized current transformer provides timely, reliable defencive function corresponding with fault level, and then ensure that Modularized current transformer reliability of operation and security.
Description
Technical field
The utility model is related to power electronics control technology field, more particularly to a kind of fault treating apparatus and system.
Background technology
With traditional current transformer contrastingly, the modularized design of current transformer has reliability higher, maintainability, sets
The features such as meter flexibility.By taking modularization inverter as an example, modularization inverter is exactly using ac converter part an as power
Unit is designed, and every modularization inverter is all made up of several power cells.In the prior art, mostly using at data signal
Reason device coordinates CPLD, is reliably and securely run with each power cell in ensureing Modularized current transformer.
However, aforesaid way is weaker due to sequential logic function, and is limited by CPLD resource,
Lead to not when failure occurs for power cell provides timely, reliable defencive function corresponding with fault level, and then make
Obtain Modularized current transformer reliability of operation and security cannot be guaranteed.
Utility model content
The purpose of the utility model embodiment is, there is provided a kind of fault treating apparatus and system, to realize being sent out in failure
For the power cell of Modularized current transformer provides timely, reliable defencive function corresponding with fault level when raw, and then ensure
Modularized current transformer reliability of operation and security.
To realize above-mentioned utility model purpose, embodiment of the present utility model provides a kind of fault treating apparatus, is used for
The power cell of Modularized current transformer, including：Data acquisition module, breakdown judge module and the control signal generation being sequentially connected
Module；The floor data of power cell described in the data collecting module collected；The breakdown judge module receives the operating mode
Data, judge whether the power cell breaks down according to the floor data, and are judging power cell failure
When, the floor data is compared with default floor data threshold value, it is determined that corresponding fault level；The control signal
Generation module is generated for indicating to perform the control signal that corresponding failure protection is operated according to the fault level for receiving.
Preferably, described device also includes：It is connected between the data acquisition module and the breakdown judge module
Data filtering module, for carrying out data filtering to the floor data for collecting.
Preferably, described device also includes：The fault alarm module being connected with the breakdown judge module, showing is used for
Characterize the warning message of the power cell failure.
Preferably, the floor data includes at least one of：Alternating current, alternating voltage, DC current, direct current
Pressure, IGBT temperature data and reactor temperature data.
Preferably, the fault treating apparatus are field programmable gate array FPGA or CPLD
CPLD。
Preferably, described device also includes：The AD Acquisition Circuit being connected with the data acquisition module, with the failure
The fault collection circuit that judge module is connected, the PWM drive circuit being connected with the control signal generation module respectively and
Digital output module, and the digital output circuit being connected with the digital output module.
Preferably, the PWM drive circuit receives institute when the breakdown judge module judges power cell failure
State first control signal for indicating block pwm pulse of control signal generation module transmission.
Preferably, the digital output module the breakdown judge module judge power cell failure when, root
According to the second control signal that the control signal generation module for receiving sends, generate for indicating the control digital output circuit
The digital quantity signal of action.
Embodiment of the present utility model additionally provides a kind of fault processing system, for Modularized current transformer, the module
Changing current transformer includes multiple power cells, including multiple such as previous embodiment with what the multiple power cell connected one to one
Described fault treating apparatus, and master control system, the multiple fault treating apparatus respectively with the master control system communication link
Connect.
Preferably, floor data and default floor data threshold value of the fault treating apparatus according to the power cell
Determine fault data, and the fault data is sent to the master control system.
Fault treating apparatus and system that the utility model embodiment is provided, by the power cell for Modularized current transformer
Config failure processing unit, the floor data of data collecting module collected power cell therein, breakdown judge module is according to connecing
The floor data of receipts judges whether power cell breaks down, and when power cell failure is judged, by floor data
It is compared with default floor data threshold value, it is determined that corresponding fault level, further basis connects control signal generation module
The fault level of receipts is generated for indicating to perform the control signal that corresponding failure protection is operated.It is achieved thereby that when failure occurs
For the power cell of Modularized current transformer provides timely, reliable defencive function corresponding with fault level, and then ensure that mould
Block current transformer reliability of operation and security.
Brief description of the drawings
Fig. 1 is the structured flowchart of the fault treating apparatus of the utility model embodiment one；For convenience of understanding, shown in figure
The power cell of Modularized current transformer；
Fig. 2 is the structure of the inversion system of the photovoltaic generation of the fault treating apparatus using the utility model embodiment one
Figure；
Fig. 3 is another structured flowchart of the fault treating apparatus of the utility model embodiment two；
Fig. 4 is the structured flowchart of the fault processing system of the utility model embodiment three；For convenience of understanding, shown in figure
The power cell of Modularized current transformer.
Specific embodiment
The utility model embodiment fault treating apparatus and system are described in detail below in conjunction with the accompanying drawings.Hereinafter implement
Example is not limited to scope of the present utility model for illustrating the utility model.
It will be understood by those skilled in the art that the term such as " first ", " second " in the utility model embodiment is only used for
Difference different step, equipment or module etc., neither represent any particular technology implication, also do not indicate that the inevitable logic between them
Sequentially.
Embodiment one
Fig. 1 is the structured flowchart of the fault treating apparatus of the utility model embodiment one.Reference picture 1, troubleshooting dress
Putting 120 is used for the power cell 110 of Modularized current transformer, and here, Modularized current transformer can be Modular photovoltaic inverter, but
Not limited to this.Including：Data acquisition module 121, breakdown judge module 122 and the control signal generation module 123 being sequentially connected；
Data acquisition module 121 gathers the floor data of power cell 110；Breakdown judge module 122 receives floor data, according to operating mode
Data judge whether power cell 110 breaks down, and judge power cell 110 break down when, by floor data with
Default floor data threshold value is compared, it is determined that corresponding fault level；Control signal generation module 123 is according to receiving
Fault level is generated for indicating to perform the control signal that corresponding failure protection is operated.
It should be noted that floor data may include, but it is not limited at least one of：It is alternating current, alternating voltage, straight
Stream electric current, DC voltage, IGBT temperature data and reactor temperature data.
The fault treating apparatus of the present embodiment are described in detail below in conjunction with Fig. 2.
By taking the inversion system of photovoltaic generation as an example, reference picture 2, the structure of main circuit specifically includes the PV being sequentially connected to Fig. 2
Array, dc switch S1, DC side Support Capacitor C, Modular photovoltaic inverter, alternating-current switch S2, transformer and power network.
In order to more fully understand the utility model embodiment, the key technology noun and critical component that are related to are carried out below
Illustrate.Pulse width modulation (Pulse Width Modulation, PWM) refer to fixed by one group of cycle, dutycycle
Variable waveform, the IGBT work in control inverter.Pwm pulse be exactly fix in foregoing one group of cycle, the ripple of variable duty ratio
Shape.Dc switch S1 and alternating-current switch S2 as shown in Figure 2 be photovoltaic generation inversion system in important circuit brake.
Generally, when inversion system breaks down, by blocking pwm pulse, disconnecting the measure such as dc switch S1 and alternating-current switch S2, come
Ensure inversion system reliability of operation and security.
In concrete implementation mode, after breakdown judge module 122 obtains floor data, failure is determined according to floor data
Grade.When the fault level judged is I grades, I grades of fault state such as IGBT excess temperatures, IGBT electric currents are excessive, alternating current-direct current side
Short circuit etc., can produce destructive expendable influence to Modularized current transformer, accordingly, it would be desirable in the same of block pwm pulse
When disconnect dc switch S1 and alternating-current switch S2；When the fault level judged is II grades, II grades of fault state is as exchanged
Excessively stream, overvoltage, under-voltage, influence now needs to block pwm pulse than more serious, prevents more serious consequence, but need not
Disconnect dc switch S1 and alternating-current switch S2；When the fault level judged is III level, the fault state of III level is as exchanged
The voltage x current of side judges that power cell does not come into operation, without blocking pwm pulse and disconnecting dc switch S1 and friendship
Stream switch S2, only alarm.Above-mentioned failure sorted mode causes that the error protection flexibility of power cell is higher.By
This, control signal generation module 123 is generated for indicating to perform the control signal that corresponding failure protection is operated according to fault level,
For example, generating for indicating to perform the control signal for blocking pwm pulse.For another example, generate and opened for indicating execution to disconnect direct current
Close the control signal of S1 and alternating-current switch S2.
The fault treating apparatus of the utility model embodiment, are breakdown judge module 122 by data acquisition module 121
The treatment of breakdown judge and determination fault level provides data basis, and control signal generation module 123 is according to breakdown judge module
122 fault levels for determining are generated for indicating to perform the control signal that corresponding failure protection is operated, it is achieved thereby that in failure
For the power cell of Modularized current transformer provides timely, reliable defencive function corresponding with fault level, Jin Erbao during generation
Modularized current transformer reliability of operation and security are demonstrate,proved.
On the basis of above-described embodiment, as shown in figure 1, further, the fault treating apparatus can also include：Connection
Data filtering module 124 between data acquisition module 121 and breakdown judge module 122, for the operating mode number to collecting
According to carrying out data filtering.
Further, the fault treating apparatus also include：The fault alarm module being connected with breakdown judge module 122
125, show the warning message for characterizing power cell failure.
Preferably, fault treating apparatus are field programmable gate array FPGA or CPLD
CPLD.In actual applications, the characteristics of FPGA is due to its concurrent operation and pipeline processes, it is excellent faster with processing speed
Gesture.In addition, FPGA inside is capable of achieving the functions such as fast Fourier transform (Fast Fourier Transformation, FFT), from
And quickly calculate each harmonic content.By contrast, the CPU sample rates of master control system of the prior art are too low, it is impossible to realize
Harmonic excess warning function.
Additionally, model of the present embodiment not to FPGA and CPLD is specifically limited.It should be noted that the application is profit
With the conventional treatment function of FPGA or CPLD, the core of the application is the frame structure inside fault treating apparatus, with
And the whole framework of multiple power cells and the fault treating apparatus composition connected one to one with multiple power cells.
Thus, the fault treating apparatus of the utility model embodiment, also have the following technical effect that：
On the one hand, in the present embodiment, the floor data for collecting is after data filtering module 124 proceeds through filtering
Just carry out breakdown judge so that the fault treating apparatus have stronger antijamming capability；
On the other hand, warning function is realized by fault alarm module 125, is easy to engineering maintenance personnel to know and breaks down
Power cell, to be repaired in time and the related work such as fault recovery；
Another further aspect, fault treating apparatus realize that, when failure occurs, FPGA is without master control system by FPGA or CPLD
The CPU of system, the very first time actively performs fault protection, and how such as locking pulse disconnects AC-DC switch.So as to be further
Power cell provides comprehensive, quick, reliable defencive function.
Embodiment two
Fig. 3 is another structured flowchart of the fault treating apparatus of the utility model embodiment two.Implement with Fig. 1 shown devices
Example is compared, and AD Acquisition Circuit 210, fault collection circuit 220, PWM drive circuit 230, digital output module are increased in Fig. 3
240 and digital output circuit 250.
Reference picture 3, the fault treating apparatus shown in the present embodiment can also include：It is connected with data acquisition module 121
AD Acquisition Circuit 210, the fault collection circuit 220 being connected with breakdown judge module 122, respectively with control signal generate mould
PWM drive circuit 230 and digital quantity output module 240 that block 123 is connected, and be connected with digital output module 240
Digital output circuit 250.
In concrete implementation mode, in Modularized current transformer normal course of operation, the AD in fault treating apparatus 120 is adopted
Collector 210 receives internal control signal, and AD Acquisition Circuit 210 includes A/D chip, and above-mentioned internal control signal is for driving
A/D chip performs the signal of AD data samplings operation, and the AD data feedbacks that will be collected are to data acquisition module 121.Here
AD data are the floor data described in previous embodiment one, and breakdown judge module 122 judges power list according to floor data
Whether unit is broken down, and corresponding fault level when determining to break down, and previous embodiment one is carried out to the above
Describe in detail, will not be described here.
Further, PWM drive circuit 230 can be received when breakdown judge module 122 judges power cell failure
The first control signal for indicating block pwm pulse that control signal generation module 123 sends.
Further, digital output module 240 can judge power cell failure in breakdown judge module 122
When, according to the second control signal that the control signal generation module 123 for receiving sends, generate for indicating control digital output circuit
The digital quantity signal of 250 actions.
When breaking down, so that fault level is I grades as an example, now need to perform disconnection while pwm pulse is blocked
The fail-safe operation of AC-DC switch.Correspondingly, PWM drive circuit 230 receives the use that control signal generation module 123 sends
In the first control signal for indicating block pwm pulse.Digital output module 240 receives control signal generation module 123 and sends
The second control signal for indicating the control action of digital output circuit 250, and according to the corresponding numeral of the second control signal generation
Amount signal.In actual applications, digital output module 240 include digital output chip, digital output circuit 250 include power supply,
The switch drive device such as relay, digital output module 240 sends the digital quantity signal of generation using digital output chip,
Above-mentioned digital quantity signal generally uses " 0 " or " 1 ".For example, after digital output circuit 250 receives digital quantity signal " 0 ", passing through
Its internal switch drive device drives AC-DC switch to disconnect.
Additionally, fault collection circuit 220 can send other fault-signals to breakdown judge module 122.For example, other failures
Signal can be the fault-signal for representative of ambient temperature alarm, when environment temperature exceedes the operating temperature ratings model of current transformer
When enclosing, fault collection circuit 220 can send this fault-signal to breakdown judge module 122.For another example, other fault-signals are also
Can be the fault-signal too low for characterizing solar panel insulation impedance.
The fault treating apparatus of the utility model embodiment, by with data acquisition module 121, breakdown judge module 122
With control signal generation module 123 cooperate AD Acquisition Circuit 210, fault collection circuit 220, PWM drive circuit 230,
The peripheral circuit and chip of digital output module 240 and digital output circuit 250, it is achieved thereby that being modularization when failure occurs
The power cell of current transformer provides timely, reliable defencive function corresponding with fault level.
Embodiment three
Fig. 4 is the structured flowchart of the fault processing system of the utility model embodiment three.Reference picture 4, the troubleshooting system
System is applied to Modularized current transformer, and Modularized current transformer includes multiple power cells 110, and the fault processing system includes and multiple
Multiple fault treating apparatus 120 as described in previous embodiment one or embodiment two that power cell 110 connects one to one, with
And master control system 130, multiple fault treating apparatus 120 communicate to connect with master control system 130 respectively.
Wherein, the real-time Communication for Power between the CPU of fault treating apparatus 120 and master control system 130 can use fiber optic communication skill
Art, but not limited to this.According to fiber optic communication, two optical fiber of hair can be received by one and realize that optical fiber uses 50M optical fiber modes
Block, signal frequency is 24MHz.
Specifically, when an error occurs, fault treating apparatus 120 can according to the floor data of power cell 110 with it is default
Floor data threshold value determine fault data, and fault data is sent to master control system 130.After pending fault recovers, failure
Processing unit 120 sends the signal for characterizing power cell fault releasing, correspondingly, master control system 130 to master control system 130
CPU send failure reset order, fault treating apparatus 120 receive the failure reset order, and make corresponding treatment.This
In, above-mentioned corresponding treatment exactly releases the fail-safe operation made when failure occurs.As an example it is assumed that failure occurs
When block pwm pulse while disconnect AC-DC switch, then after receiving failure reset order, fault treating apparatus 120 are just
Need to perform the operation for opening pwm pulse and closure AC-DC switch.Specifically, with reference to Fig. 4 and Fig. 3, opening pwm pulse behaviour
Need to send control signals to control generation module 123 by master control system 130, indicate PWM to drive by controlling generation module 123
Dynamic circuit 230 opens pwm pulse.
The fault processing system of the utility model embodiment, one is configured by the power cell for each Modularized current transformer
Individual fault treating apparatus, the fault treating apparatus only process the failure situation of corresponding power cell, perform error protection
Operation, does not interfere with the work of other power cells.So as to provide the function of redundancy protection of Modularized current transformer, meanwhile,
Drastically increase the redundancy and reliability of Modularized current transformer.Also, by multiple fault treating apparatus respectively with master control
System is communicated to connect, and after any power cell fault, fault treating apparatus corresponding with the power cell of failure are to master control system
System sends fault data, and after pending fault recovers, master control system can be sent to failure reset order again so that troubleshooting is filled
Put execution corresponding operating, it is ensured that the power cell after fault recovery continues normal operation.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power
The protection domain that profit is required is defined.
Claims (10)
1. a kind of fault treating apparatus, for the power cell of Modularized current transformer, it is characterised in that including：It is sequentially connected
Data acquisition module, breakdown judge module and control signal generation module；
The floor data of power cell described in the data collecting module collected；
The breakdown judge module receives the floor data, judges whether the power cell occurs according to the floor data
Failure, and when power cell failure is judged, the floor data is compared with default floor data threshold value,
It is determined that corresponding fault level；
The control signal generation module is generated for indicating to perform corresponding failure protection according to the fault level for receiving
The control signal of operation.
2. fault treating apparatus according to claim 1, it is characterised in that also include：It is connected to the data acquisition module
Data filtering module between block and the breakdown judge module, for carrying out data filter to the floor data for collecting
Ripple.
3. fault treating apparatus according to claim 1, it is characterised in that also include：With the breakdown judge module phase
The fault alarm module of connection, shows the warning message for characterizing the power cell failure.
4. fault treating apparatus according to any one of claims 1 to 3, it is characterised in that the floor data includes
At least one of：Alternating current, alternating voltage, DC current, DC voltage, IGBT temperature data and reactor temperature number
According to.
5. fault treating apparatus according to claim 4, it is characterised in that the fault treating apparatus are field-programmable
Logic gate array FPGA or complex programmable logic device (CPLD).
6. fault treating apparatus according to claim 4, it is characterised in that described device also includes：Adopted with the data
The AD Acquisition Circuit that collection module is connected, the fault collection circuit being connected with the breakdown judge module, respectively with the control
PWM drive circuit and digital quantity output module that signal generation module processed is connected, and with the digital output module phase
The digital output circuit of connection.
7. fault treating apparatus according to claim 6, it is characterised in that the PWM drive circuit is sentenced in the failure
When module of breaking judges power cell failure, receive the control signal generation module transmission blocks PWM arteries and veins for instruction
First control signal of punching.
8. fault treating apparatus according to claim 6 or 7, it is characterised in that the digital output module is described
When breakdown judge module judges power cell failure, second sent according to the control signal generation module for receiving
Control signal, generates the digital quantity signal for indicating the control digital output circuit action.
9. a kind of fault processing system, for Modularized current transformer, the Modularized current transformer includes multiple power cells, and it is special
Levy and be, the system includes multiple such as any one of claim 1~8 with what the multiple power cell connected one to one
Described fault treating apparatus, and master control system, the multiple fault treating apparatus respectively with the master control system communication link
Connect.
10. fault processing system according to claim 9, it is characterised in that the fault treating apparatus are according to the work(
The floor data of rate unit and default floor data threshold value determine fault data, and the fault data is sent to described
Master control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377566.7U CN206292583U (en) | 2016-12-14 | 2016-12-14 | Fault treating apparatus and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377566.7U CN206292583U (en) | 2016-12-14 | 2016-12-14 | Fault treating apparatus and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206292583U true CN206292583U (en) | 2017-06-30 |
Family
ID=59104352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621377566.7U Active CN206292583U (en) | 2016-12-14 | 2016-12-14 | Fault treating apparatus and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206292583U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680344A (en) * | 2017-10-27 | 2018-02-09 | 安徽容知日新科技股份有限公司 | A kind of acquisition methods and computing device of equipment alarm grade |
| CN110850195A (en) * | 2019-10-18 | 2020-02-28 | 郑州森源新能源科技有限公司 | Detection method and device for chained SVG power module |
-
2016
- 2016-12-14 CN CN201621377566.7U patent/CN206292583U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680344A (en) * | 2017-10-27 | 2018-02-09 | 安徽容知日新科技股份有限公司 | A kind of acquisition methods and computing device of equipment alarm grade |
| CN107680344B (en) * | 2017-10-27 | 2020-06-05 | 安徽容知日新科技股份有限公司 | Method for acquiring alarm level of equipment and computing equipment |
| CN110850195A (en) * | 2019-10-18 | 2020-02-28 | 郑州森源新能源科技有限公司 | Detection method and device for chained SVG power module |
| CN110850195B (en) * | 2019-10-18 | 2022-02-22 | 郑州森源新能源科技有限公司 | Detection method and device for chained SVG power module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018014450A1 (en) | Rt-lab-based real microgrid operation dynamic simulation testing platform | |
| CN103440726B (en) | Electric fire disaster warning information processing method and system | |
| CN106208129B (en) | The connection control method of parallel connection direct power supply and its device of application | |
| CN103915836B (en) | A kind of use for laboratory smart micro-grid system based on multiple distributed power sources | |
| CN103545924B (en) | Secondary device state on_line monitoring method | |
| CN104267296B (en) | STATCOM fault diagnosis method based on MMC | |
| CN102255330A (en) | Device and method for detecting island of micro power grid system | |
| CN104734362A (en) | Photovoltaic inverter health status monitoring and alarm system | |
| CN102664457A (en) | Energy management system for ship | |
| CN206292583U (en) | Fault treating apparatus and system | |
| CN202586500U (en) | Ship energy management system | |
| CN109921388A (en) | The direct current cut-off device and method of hybrid MMC and AC circuit breaker cooperation | |
| CN105470935A (en) | Defect security isolation and auxiliary decision-making method for intelligent substation relay protection equipment | |
| CN104836626A (en) | Digital transformer station distributed test system | |
| CN105990834A (en) | Fault diagnosis and evaluation method for battery energy-storage power station | |
| Monadi et al. | Implementation of the differential protection for MVDC distribution systems using real-time simulation and hardware-in-the-loop | |
| CN106685083B (en) | Intelligent power distribution terminal and method for analyzing electricity utilization behavior of charging pile | |
| CN104319887A (en) | Optical fiber chain scission anomaly judgment method for intelligent transformer substation | |
| CN201682276U (en) | Relay protection and fault analysis system for power grid | |
| CN203774756U (en) | On-line monitoring protection device for relay protection of high voltage equipment | |
| CN206259694U (en) | The protection device of inversion system | |
| CN103489058B (en) | TipWizard based on intelligent engine transfers method and device | |
| CN202268901U (en) | Distributed controller for simple communication | |
| CN102249126B (en) | Converting conduction monitoring system for insulated gate transistor used in mine hoist | |
| CN105762932A (en) | Intelligent transformer station intelligent warning system based on plug-in mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |