CN110492450A - A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination - Google Patents
A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination Download PDFInfo
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- CN110492450A CN110492450A CN201910827293.3A CN201910827293A CN110492450A CN 110492450 A CN110492450 A CN 110492450A CN 201910827293 A CN201910827293 A CN 201910827293A CN 110492450 A CN110492450 A CN 110492450A
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- Prior art keywords
- protection
- defect elimination
- line
- instrument
- following route
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, and including protection instrument cabinet, the intracorporal WXH-822A molded line line protection device of protection instrument case, the fixation panel being fixedly mounted on protection instrument cabinet and the indicator elment, interface element and the operating element that are separately positioned on fixed panel is arranged in；The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.Primary equipment power off time is greatly shortened; the device uses portable pin layout; it only needs the electric power loop of former protective device, Current Voltage circuit, closing loop accessing the device with test wire, defencive function can be realized, can temporarily replace former line protective devices operation.Its wiring is simple, and use is safe, can be realized simple protection act.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of 35kV and the following interim standby of route protection defect elimination
Protect instrument.
Background technique
Defect elimination refers to the work for eliminating defect of transformer equipment.Substation equipment trial operation or long operational time, it may appear that
Some defects.If converting station instrument instruction is inaccurate, damage, substation's electric switch cannot close a floodgate, breaking, electric wiring contact hair
The failures such as heat, these are all the contents of daily defect elimination.Day-to-day operation equipment deficiency is eliminated, so referred to as defect elimination.Discovery in time
Equipment deficiency, processing is eliminated in time, just be can guarantee that transformer equipment is safely operated, is guaranteed normal power supply.
When the primary equipments such as route, transformer, capacitor, reactor lose main protection, should stop transport relevant device, remove non-post
Standby protection can guarantee system stabilization and equipment safety operation.2.3.1.9 accident, abnormal disposition etc. in emergency circumstances, can be taken not
The same operational safety for guaranteeing power grid, equipment beyond this defined operational means.Relay was for protecting originally
The safe and stable operation device for protecting primary equipment, some defects can inevitably occur in longtime running, cause shadow to defencive function
It rings, or even needs to put the cart before the horse because of faults itself stoppage in transit primary equipment, therefore shorten primary equipment caused by relay protection defect
Power off time is very necessary.The defect type for analyzing last year relay protection profession line protective device, by protective device sheet
Several aspect Classifying Sums such as body, secondary circuit and ancillary equipment, protection Channel Interface Unit, passageway machining equipment, find line
The device noumenon defect of line protection device is the long main crux of power off time.
Summary of the invention
The object of the present invention is to provide a kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, are greatly shortened
Primary equipment power off time, the device use portable pin layout, it is only necessary to by the electric power loop of former protective device, electric current electricity
It pushes back road, closing loop and accesses the device with test wire, defencive function can be realized, can temporarily replace former route protection dress
Set operation.Its wiring is simple, and use is safe, can be realized simple protection act.
To achieve the goals above, the technical solution adopted by the present invention is as follows:
A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, including protection instrument cabinet, setting are in protection instrument cabinet
Interior WXH-822A molded line line protection device, the fixation panel being fixedly mounted on protection instrument cabinet and it is separately positioned on fixation
Indicator elment, interface element and operating element on panel；
The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.
As a further improvement of the present invention, the indicator elment includes the tripping for being used to refer to route and being in tripped condition
Indicator light and it is used to refer to the combined floodgate indicator light that route is in "on" position.
As a further improvement of the present invention, the interface element include+KM ,-KM ,+BM ,-BM, IA, IB, IC, IN,
UA, UB, the connecting terminal of UC, UN, 7,37 and 9；
As a further improvement of the present invention ,+the KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, the and of UC, UN, 7,37
9, which are all made of portable contact pin structure, carries out wiring.
As a further improvement of the present invention, secondary wiring+KM ,-KM are respectively connected to protective device power supply.
As a further improvement of the present invention, combined floodgate wiring accesses protective device combined floodgate outlet port 7, separating brake wiring access
Protective device tripping outlet port 37.
As a further improvement of the present invention, external TWJ wiring line attachment protects contact 9.
As a further improvement of the present invention, the operating element includes output change-over switch and manual division switch；Institute
It states manual division switch and is used to carry out divide-shut brake route, the output change-over switch is used to switch the conversion of outlet line.
As a further improvement of the present invention, the operating element further includes reclosing pressing plate and output clamping；Reclosing
Pressing plate is used to determine whether this device of reclosing comes into operation；
Output clamping is the movement pressing plate for exporting intermediate relay, and when any protection act all must first connect one and can turn on jump
The relay of lock wire loop could connect the direct current of breaking coil after the contact closure of the relay, so that tripping is disconnected
Road device, output clamping are mounted on the DC loop of intermediate relay.
As a further improvement of the present invention, the operating element further includes that power supply is spaced apart, and is spaced apart control WXH- with power supply
The supplied by AC/DC electricity of 822A molded line line protection device.
Compared with prior art, obtained by the present invention to have the beneficial effect that:
(1) mature protective device reduces the fault in terms of working principle；When choosing protective device, 35kV is considered and with offline
Line protection device protects the different characteristics of producer's principle, is finally latched using the communication of WXH822A device, breaker tripping and closing logic, device
Logic has the line protective devices of general applicability.
(2) circuit design is simple；It only needs to introduce the dress from original protection terminal block with test wire for 7,37,9 in schematic diagram
Set, breaker tripping and closing function can be realized, run instead of electrical source protecting equipment, can power transmission, so as to shorten primary equipment power off time.Again
Defect elimination is carried out to verify former protective device with the presence or absence of problem, and the problematic plug-in unit of replacement using mimic-disconnecting switch.
(3) Reliability of Microprocessor is high；Line protective devices have general applicability, can meet different manufacturers protective device not
Same feature makes it not have particularity.
(4) easy to assembly；Device uses portable pin layout, it is only necessary to by the electric power loop of former protective device, electric current
Voltage circuit, closing loop access the device with test wire, and defencive function can be realized.
(5) has anti-bouncing function；The line protective devices have anti-jump loop, can prevent from switching repeatedly jumping to close and cause out
The damage of pass.
Detailed description of the invention
Fig. 1 is the interim back-up protection instrument schematic diagram of route protection defect elimination of the invention；
Fig. 2 is the interim back-up protection instrument logic diagram of route protection defect elimination of the invention；
Fig. 3 is the interim back-up protection instrument device panel figure of route protection defect elimination of the invention；；
Fig. 4 is the analysis chart of the defect type of relay protection profession line protective device.
In attached drawing,
10 protection instrument cabinets, 11 output change-over switch, 12 manual division switches, 13 positioning indicator lights, 14 coincidence indicator lights, 15 electricity
Source is spaced apart, 16 reclosing pressing plates, 17 output clampings.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the application and its application or making
Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall in the protection scope of this application.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited scope of the present application processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
In the description of the present application, it is to be understood that the noun of locality such as " front, rear, top, and bottom, left and right ", " laterally, vertical,
Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes
System is merely for convenience of description the application and simplifies description, and in the absence of explanation to the contrary, these nouns of locality do not indicate that
It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage
Solution is the limitation to the application protection scope；The noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for
Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this
Apply for the limitation of protection scope.
As shown in figure 4, by the defect type of analysis last year relay protection profession line protective device, by protective device sheet
Several aspect Classifying Sums such as body, secondary circuit and ancillary equipment, protection Channel Interface Unit, passageway machining equipment, find line
The device noumenon defect of line protection device is the long main crux of power off time；For this analysis, solved by following embodiments
Certainly device noumenon defect.
Embodiment one
As illustrated in the accompanying drawings from 1 to 3；
A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, including protection instrument cabinet 10, setting are in protection instrument case
It WXH-822A molded line line protection device in body 10, the fixation panel being fixedly mounted on protection instrument cabinet 10 and is respectively set
Indicator elment, interface element and operating element on fixed panel；
The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.
Further, the indicator elment includes being used to refer to route to be in the tripping indicator light 13 of tripped condition and be used to
Indicate that route is in the combined floodgate indicator light 14 of "on" position.
Further, the interface element includes+KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, UC, UN, 7,37
With 9 connecting terminals；
Secondary wiring+KM ,-KM are respectively connected to protective device power supply.
Combined floodgate wiring accesses protective device combined floodgate outlet port 7, and separating brake wiring accesses protective device tripping outlet port 37.
External TWJ wiring line attachment protects contact 9.
The operating element includes output change-over switch 11 and manual division switch 12；The manual division switch 12 is used to
Divide-shut brake route is carried out, the output change-over switch 11 is used to switch the conversion of outlet line.
The technical effect of the present embodiment: mature protective device reduces the fault in terms of working principle；Choosing protection dress
When setting, the different characteristics of 35kV and following line protective devices protection producer's principle are considered, finally communicated using WXH822 device,
Breaker tripping and closing logic, device latching logic have the line protective devices of general applicability.
Circuit design is simple；It only needs to introduce the device from original protection terminal block with test wire for 7,37,9 in schematic diagram,
Breaker tripping and closing function can be realized, run instead of electrical source protecting equipment, can power transmission, so as to shorten primary equipment power off time.It adopts again
Defect elimination is carried out with mimic-disconnecting switch to verify former protective device with the presence or absence of problem, and the problematic plug-in unit of replacement.
Reliability of Microprocessor is high；Line protective devices have general applicability, can meet the difference of different manufacturers protective device
Feature makes it not have particularity.
Embodiment two
As illustrated in the accompanying drawings from 1 to 3；
A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, including protection instrument cabinet 10, setting are in protection instrument case
It WXH-822A molded line line protection device in body 10, the fixation panel being fixedly mounted on protection instrument cabinet 10 and is respectively set
Indicator elment, interface element and operating element on fixed panel；
The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.
Further, the indicator elment includes being used to refer to route to be in the tripping indicator light 13 of tripped condition and be used to
Indicate that route is in the combined floodgate indicator light 14 of "on" position.
Further, the interface element includes+KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, UC, UN, 7,37
With 9 connecting terminals；
Further ,+the KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, UC, UN, 7,37 and 9 are all made of portable
Contact pin structure carries out wiring.
Secondary wiring+KM ,-KM are respectively connected to protective device power supply.
Combined floodgate wiring accesses protective device combined floodgate outlet port 7, and separating brake wiring accesses protective device tripping outlet port 37.
External TWJ wiring line attachment protects contact 9.
The operating element includes output change-over switch 11 and manual division switch 12；The manual division switch 12 is used to
Divide-shut brake route is carried out, the output change-over switch 11 is used to switch the conversion of outlet line.
The technical effect of the present embodiment: mature protective device reduces the fault in terms of working principle；Choosing protection dress
When setting, the different characteristics of 35kV and following line protective devices protection producer's principle are considered, finally communicated using WXH822 device,
Breaker tripping and closing logic, device latching logic have the line protective devices of general applicability.
Circuit design is simple；It only needs to introduce the device from original protection terminal block with test wire for 7,37,9 in schematic diagram,
Breaker tripping and closing function can be realized, run instead of electrical source protecting equipment, can power transmission, so as to shorten primary equipment power off time.It adopts again
Defect elimination is carried out with mimic-disconnecting switch to verify former protective device with the presence or absence of problem, and the problematic plug-in unit of replacement.
Reliability of Microprocessor is high；Line protective devices have general applicability, can meet the difference of different manufacturers protective device
Feature makes it not have particularity.
It is easy to assembly；Device uses portable pin layout, it is only necessary to by the electric power loop of former protective device, Current Voltage
Circuit, closing loop access the device with test wire, and defencive function can be realized.
Embodiment three
As illustrated in the accompanying drawings from 1 to 3；
A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that: including protection instrument cabinet 10, setting
Protection instrument cabinet 10 in WXH-822A molded line line protection device, be fixedly mounted on protection instrument cabinet 10 on fixation panel with
And it is separately positioned on indicator elment, interface element and operating element on fixed panel；
The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.
Further, the indicator elment includes being used to refer to route to be in the tripping indicator light 13 of tripped condition and be used to
Indicate that route is in the combined floodgate indicator light 14 of "on" position.
Further, the interface element includes+KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, UC, UN, 7,37
With 9 connecting terminals.
Further ,+the KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, UC, UN, 7,37 and 9 are all made of just
It takes formula contact pin structure and carries out wiring.
Further, secondary wiring+KM ,-KM are respectively connected to protective device power supply.
Further, combined floodgate wiring accesses protective device combined floodgate outlet port 7, and separating brake wiring access protective device trips out
Mouth position 37.
Further, external TWJ wiring line attachment protects contact 9.
Further, the operating element includes output change-over switch 11 and manual division switch 12；The manual division
Switch 12 is used to carry out divide-shut brake route, and the output change-over switch 11 is used to switch the conversion of outlet line.
Further, the operating element further includes reclosing pressing plate 16 and output clamping 17；Reclosing pressing plate 16 is used to
Determine whether this device of reclosing comes into operation；
Output clamping 17 is the movement pressing plate for exporting intermediate relay, and when any protection act, which all must first connect one, can turn on
The relay in breaking coil circuit could connect the direct current of breaking coil after the contact closure of the relay, thus tripping
Breaker, output clamping are mounted on the DC loop of intermediate relay.
Further, the operating element further includes that power supply is spaced apart 15, is spaced apart control WXH-822A molded line road with power supply and protects
The supplied by AC/DC electricity of protection unit.
The device uses portable pin layout, it is only necessary to by the electric power loop of former protective device, Current Voltage circuit, jump
Closing circuit accesses the device with test wire, and defencive function can be realized, and can temporarily replace former line protective devices operation.I.e.
Then route power transmission can be verified the quality of former protective device, when interruption maintenance has been greatly shortened using mimic-disconnecting switch
Between.The device can use supplied by AC/DC electricity, have power source special to be spaced apart control.It is topmost current loop, followed by voltage returns
Road, it is only necessary to the two circuits are directly accessed device with test wire, then WXH-822A molded line line protection device can acquire
To the Current Voltage of former protective device.This device is electrically accessed by breaker tripping and closing and just again, by protective device definite value, output clamping and
Reclosing pressing plate, manual division switch play the function of protection circuit.Can by the switching on and off indicator light on device panel come
Judge that route is currently in quartile or coincidence.
Specific wiring are as follows: secondary wiring+KM ,-KM are respectively connected to protective device power supply；Combined floodgate wiring accesses protective device and closes
Lock outlet port 7, separating brake wiring access protective device tripping outlet port 37, and external TWJ wiring line attachment protection TWJ is connect
Verifying protective device reclosing function may be implemented in point 9.Divide-shut brake can be achieved using protective device breaking-closing operating hand handle, make
Movement.Protective device can thus be verified, switch transmission test.
The technical effect of the present embodiment: mature protective device reduces the fault in terms of working principle；Choosing protection dress
When setting, the different characteristics of 35kV and following line protective devices protection producer's principle are considered, finally communicated using WXH822 device,
Breaker tripping and closing logic, device latching logic have the line protective devices of general applicability.
Circuit design is simple；It only needs to introduce the device from original protection terminal block with test wire for 7,37,9 in schematic diagram,
Breaker tripping and closing function can be realized, run instead of electrical source protecting equipment, can power transmission, so as to shorten primary equipment power off time.It adopts again
Defect elimination is carried out with mimic-disconnecting switch to verify former protective device with the presence or absence of problem, and the problematic plug-in unit of replacement.
Reliability of Microprocessor is high；Line protective devices have general applicability, can meet the difference of different manufacturers protective device
Feature makes it not have particularity.
It is easy to assembly；Device uses portable pin layout, it is only necessary to by the electric power loop of former protective device, Current Voltage
Circuit, closing loop access the device with test wire, and defencive function can be realized.
Has anti-bouncing function；The line protective devices have anti-jump loop, can prevent from switching repeatedly jumping to close and cause to switch
Damage.
Claims (10)
1. a kind of 35kV and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that: including protection instrument cabinet (10),
It is arranged and is protecting the WXH-822A molded line line protection device in instrument cabinet (10), is being fixedly mounted on consolidating in protection instrument cabinet (10)
Determine panel and the indicator elment being separately positioned on fixed panel, interface element and operating element；
The indicator elment, interface element and operating element are electrically connected WXH-822A molded line line protection device.
2. a kind of 35kV according to claim 1 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
The indicator elment includes being used to refer to route to be in the tripping indicator light (13) of tripped condition and be used to refer to route in conjunction
The combined floodgate indicator light (14) of lock state.
3. a kind of 35kV according to claim 1 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
The interface element includes+KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, the connecting terminal of UC, UN, 7,37 and 9.
4. a kind of 35kV according to claim 3 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
+ the KM ,-KM ,+BM ,-BM, IA, IB, IC, IN, UA, UB, the connecting terminal of UC, UN, 7,37 and 9 are all made of portable pin junction
Structure carries out wiring.
5. a kind of 35kV according to claim 4 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
Secondary wiring+KM ,-KM are respectively connected to protective device power supply.
6. a kind of 35kV according to claim 5 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
Combined floodgate wiring accesses protective device combined floodgate outlet port, and protective device combined floodgate outlet port is located at 7 connecting terminals, separating brake
Wiring accesses protective device tripping outlet port, and protective device tripping outlet port is located at 37 connecting terminals.
7. a kind of 35kV according to claim 6 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
External TWJ wiring line attachment protects contact 9.
8. a kind of 35kV according to claim 1 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
The operating element includes output change-over switch (11) and manual division switch (12)；The manual division switch (12) be used into
Row divide-shut brake route, the output change-over switch (11) are used to switch the conversion of outlet line.
9. a kind of 35kV according to claim 8 and the interim back-up protection instrument of following route protection defect elimination, it is characterised in that:
The operating element further includes reclosing pressing plate (16) and output clamping (17)；Reclosing pressing plate (16) be used to determine reclosing this
Whether a device comes into operation；
Output clamping (17) is the movement pressing plate for exporting intermediate relay, and all first connecting one when any protection act can turn on jump
The relay of lock wire loop connects the direct current of breaking coil after the contact closure of the relay, thus tripping circuit breaker,
Output clamping is mounted on the DC loop of intermediate relay.
10. a kind of 35kV according to claim 9 and the interim back-up protection instrument of following route protection defect elimination, feature exist
In: the operating element further includes that power supply is spaced apart (15), and the friendship for being spaced apart control WXH-822A molded line line protection device with power supply is straight
Stream power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910827293.3A CN110492450A (en) | 2019-09-03 | 2019-09-03 | A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910827293.3A CN110492450A (en) | 2019-09-03 | 2019-09-03 | A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110492450A true CN110492450A (en) | 2019-11-22 |
Family
ID=68556171
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910827293.3A Pending CN110492450A (en) | 2019-09-03 | 2019-09-03 | A kind of 35kV and the interim back-up protection instrument of following route protection defect elimination |
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| CN (1) | CN110492450A (en) |
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Application publication date: 20191122 |