CN202651793U - Novel 10kV switching device - Google Patents
Novel 10kV switching device Download PDFInfo
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- CN202651793U CN202651793U CN 201220082963 CN201220082963U CN202651793U CN 202651793 U CN202651793 U CN 202651793U CN 201220082963 CN201220082963 CN 201220082963 CN 201220082963 U CN201220082963 U CN 201220082963U CN 202651793 U CN202651793 U CN 202651793U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a novel 10kV switching device. The device is mainly formed by a combination switch module unit, a three-phase current transformer, a three-phase voltage transformer and a switch operation intelligence controller. After being mutually connected in series with an electronic power switch, a vacuum disconnecting switch of the combination switch module unit is connected in parallel with a high-voltage vacuum circuit breaker. Two ends of the high-voltage vacuum circuit breaker are served as the two ends of a switching device body and are connected in series in a main circuit to be controlled. The three-phase voltage transformer is connected in parallel in the main circuit to be controlled. The three-phase current transformer is connected in series in the main circuit to be controlled or a bus of the main circuit to be controlled passes through the three-phase current transformer. Output terminals of the three-phase voltage transformer and the three-phase current transformer are connected with an input terminal of the switch operation intelligence controller respectively. The output terminal of the switch operation intelligence controller is connected with control terminals of the high-voltage vacuum circuit breaker, the vacuum disconnecting switch and the electronic power switch respectively. By using the device of the utility model, high voltage, large current, low cost and high precision application can be realized.
Description
Technical field
The utility model relates to electric power system or high voltage applications field, is specifically related to a kind of Novel 10 kV switch device.
Background technology
Along with the development of power industry and application technology, modern electric is used the quality of power supply and power supply reliability level is had higher requirement.Power System Reactive Power was regulated and main synchronous compensator and the Shunt Capacitor Unit of adopting of the stable control of voltage levvl in the past, and the two respectively has pluses and minuses on using.The synchronous compensator reactive power can be regulated continuously, and it not only can send also absorbing reactive power within the specific limits of reactive power, and it is better that power and voltage are adjusted effect; Synchronous compensator belongs to rotary electrical apparatus, and structure is complicated, the operation maintenance workload is large, investment is large.Power capacitor is simple in structure, investment cost is low, but it can not regulate the reactive power value that sends continuously, and its reactive compensation capacity and installation site voltage squared are proportional, idle and the voltage-regulation effect of being played by the capacitor group when idle not enough voltage drop is limited, main shortcoming is easily to produce overvoltage and inrush phenomenon in the capacitor switching process, the overvoltage that produces will produce impact with other electric equipment that shoves to contiguous in compensation condenser itself and the system, affect the useful life of equipment, even cause the scaling loss of capacitor group and the damage of other electric equipment, and then causing the system failure, impact is normal produces and life.
The Static Var Compensator (SVC) that occurs in recent years; static reacance generator (SVG) and static passive compensation device (STACOM) are though allow the application needs that can satisfy preferably reactive power compensation; but its control system is complicated; the operation maintenance condition is higher; the control switch that adopts is power electronic device; higher in electric pressure; the occasion that operating current is larger need to be to each electronic power switch connection in series-parallel combination as control switch; to greatly increase the complexity of cost of investment and control system in this case, to the overvoltage of device; overcurrent and overheat protector propose very harsh requirement.Based on above discussion, the utility model proposes and a kind ofly have electronic power switch control concurrently accurately and mechanical switch is withstand voltage, cubicle switchgear and the electric reactive compensating application process of the high-performance of the large advantage of through-current capability, low cost and high reliability.
The utility model content
Technical problem to be solved in the utility model provides a kind of Novel 10 kV switch device and control method thereof, and its low-cost and high-precision that can realize high pressure, large electric current is used.
For addressing the above problem, the utility model is realized by following scheme:
A kind of Novel 10 kV switch device of the utility model comprises the switching device body, it is characterized in that: described switching device body mainly is comprised of unit switch modular unit, threephase current transformer, threephase potential transformer and switching manipulation intelligent controller;
The unit switch modular unit comprises high-pressure vacuum breaker, vacuum interrupter and electronic power switch, after wherein vacuum interrupter and electronic power switch are connected mutually, be in parallel with high-pressure vacuum breaker, the two ends of high-pressure vacuum breaker are serially connected with on the main circuit to be controlled as the two ends of switching device body respectively; Load current when the dynamic current when high-pressure vacuum breaker closes with breaking operation for the carrying pass and normal operation; Electronic power switch closes to close with disjunction for accurate control main circuit to be controlled and carries constantly, in short-term main circuit current to be controlled; Vacuum interrupter is used for cooperating high-pressure vacuum breaker and electronic power switch work;
Threephase potential transformer is measured voltage signal on the main circuit to be controlled, and threephase current transformer is measured current signal on the main circuit to be controlled, and the output of threephase potential transformer and threephase current transformer links to each other with the input of switching manipulation intelligent controller respectively; Threephase potential transformer and threephase current transformer are sent operating voltage and the operating current of its main circuit to be controlled that detects in real time into the switching manipulation intelligent controller respectively;
The output of switching manipulation intelligent controller connects respectively the control end of high-pressure vacuum breaker, vacuum interrupter and electronic power switch; The operating voltage phase place of switching manipulation intelligent controller real-time tracking main circuit to be controlled and operating current phase place, and according to the topological structure of unit switch modular unit and control strategy realize high-pressure vacuum breaker and vacuum interrupter in the unit switch modular unit divide, close a floodgate control, and the electronic power switch conducting end and control.
In the such scheme, described switching manipulation intelligent controller comprises intelligent measurement and control unit and core processor unit; Wherein
Intelligent measurement and control unit comprises voltage conditioning module, current regulating module and driver module; Threephase potential transformer links to each other via the input of voltage conditioning module with the core processor unit, threephase current transformer links to each other via the input of current regulating module with the core processor unit, and the output of core processor unit links to each other with the unit switch modular unit via driver module; Intelligent measurement and control unit is responsible for conversion and the follow-up signal conditioning of main circuit operating voltage to be controlled and operating current, and the control of the combined floodgate of the high-pressure vacuum breaker of unit switch modular unit, vacuum interrupter and electronic power switch;
The core processor unit comprises digital signal processor and programmable logic processor, links to each other by the dual port random access memory between digital signal processor and the programmable logic processor; Programmable logic processor is responsible for the sequential logic control during the analog-to-digital conversion, and three-phase operating current, three-phase operating voltage and other analog signal that will collect read with the process subsequent analysis for digital signal processor by the dual port random access memory and process; Digital signal processor is finished preliminary treatment, voltage and current numerical computations, and main circuit operating voltage phase place and the comparison of operating current Phase Tracking of collection signal.
In the such scheme, described switching manipulation intelligent controller also further comprises unit switch state autodiagnosis unit and/or protection monitoring unit, and this unit switch state autodiagnosis unit is connected with the core processor unit respectively with the protection monitoring unit; Wherein to be responsible for recording the contact position of high-pressure vacuum breaker, vacuum interrupter and electronic power switch be make-and-break status information, operating mechanism energy storage situation, actuating historical record and state estimation information to unit switch module status self-diagnosis unit switches; The protection monitoring unit is used to main circuit to be controlled to realize overcurrent and overvoltage trip protection, the monitoring of electronic power switch driving condition and electronic power switch overcurrent, overvoltage and temperature protection.
In the such scheme, described unit switch state autodiagnosis unit all is connected with the core processor unit by controller local area network's bus with the protection monitoring unit.
In the such scheme, also be connected to hand switch on the input of described core processor unit, this hand switch is used for the manually break-make instruction of input main circuit to be controlled.
Compared with prior art, the utlity model has following features:
1, according to the formation characteristics of unit switch modular unit and the action control strategy of intelligence operation controller, can reasonably select and set the input of power capacitor bank and withdraw from the moment, the electro-magnetic transient concussion process that produces in the time of can effectively avoiding only by the vacuum circuit-breaker switching, elimination and over-voltage suppression and operation are shoved effectively, avoid the impact to capacitor and surrounding devices, can effectively improve the fail safe of equipment and the person;
2. the unit switch modular unit is made of by special topological structure contact switch device high-pressure vacuum breaker, isolating switch and electronic power switch and forms switch module; The vacuum circuit-breaker nominal operational parameters is the peak performance parameter (rated voltage and electric current) of whole combined high pressure switching device, electronic power switch is embodied in the operation precision of cubicle switchgear, the divide-shut brake characteristic that mainly refers to the combined high pressure switching device cooperates proprietary intelligence operation controller can realize the low-cost and high-precision application of high pressure, large electric current;
3. the switching manipulation intelligent controller adopts the two-processor system that DSP and FPGA consist of, intelligent measurement and control unit detects operating voltage and the operating current of combination high voltage switching device in real time, realize the Based Intelligent Control of whole device according to topological structure and control strategy, have that control precision is high, fast response time and strong characteristics of anti-electromagnetic interference capability;
4. the state of each switchgear of unit switch module status self diagnosis and protected location monitoring unit switch module comprises contacts for vacuum-break switches location status information, operating mechanism energy storage situation, actuating historical record and state estimation information; The triggering monitoring of electronic power switch, overvoltage, overcurrent, temperature protection and monitoring etc., self diagnosis and the error protection of realization control system are avoided false triggering and the tripping of switching device;
5, the switching manipulation intelligent controller adopts the dual CAN bus communication interface, and two CAN bus interface are for subsequent use each other, and reliability is high.Control and status monitoring information can be in time mutual by CAN and monitoring host computer, make things convenient for networking monitoring and control switch state, realize intelligent use.
Description of drawings
Fig. 1 is a kind of schematic diagram of Novel 10 kV switch device;
Fig. 2 is a kind of schematic diagram of switching manipulation intelligent controller;
Fig. 3 is that a kind of Novel 10 kV switch device uses state diagram;
Fig. 4 is each time chart of connection control procedure of operating voltage waveform and main circuit to be controlled;
Fig. 5 is each time chart of disconnection control procedure of operating current waveform and main circuit to be controlled.
Embodiment
Referring to Fig. 1, a kind of Novel 10 kV switch device of the utility model mainly is comprised of unit switch modular unit, threephase current transformer, threephase potential transformer and switching manipulation intelligent controller.
The unit switch modular unit comprises high-pressure vacuum breaker, vacuum interrupter and electronic power switch.After wherein vacuum interrupter and electronic power switch are connected mutually, be in parallel with high-pressure vacuum breaker.The two ends of high-pressure vacuum breaker are serially connected with on the main circuit to be controlled as the two ends of switching device body respectively.Load current when the dynamic current when high-pressure vacuum breaker closes with breaking operation for the carrying pass and normal operation.Electronic power switch closes to close with disjunction for accurate control main circuit to be controlled and carries constantly, in short-term main circuit current to be controlled.Vacuum interrupter is used for cooperating high-pressure vacuum breaker and electronic power switch work.
Threephase potential transformer is attempted by on the main circuit to be controlled, and threephase current transformer is serially connected on the main circuit to be controlled or allows main circuit bus to be controlled pass threephase current transformer.The output of threephase potential transformer and threephase current transformer links to each other with the input of switching manipulation intelligent controller respectively.Threephase potential transformer and threephase current transformer are sent operating voltage and the operating current of its main circuit to be controlled that detects in real time into the switching manipulation intelligent controller respectively.
The output of switching manipulation intelligent controller connects respectively the control end of high-pressure vacuum breaker, vacuum interrupter and electronic power switch.The operating voltage phase place of switching manipulation intelligent controller real-time tracking main circuit to be controlled and operating current phase place, and realize high-pressure vacuum breaker in the unit switch modular unit and the control of vacuum interrupter divide-shut brake, and electronic power switch conducting cut-off control according to the topological structure of unit switch modular unit and control strategy.
In the utility model, described switching manipulation Based Intelligent Control implement body comprises intelligent measurement and control unit, core processor unit, unit switch state autodiagnosis unit and protection monitoring unit, referring to Fig. 2.
Intelligent measurement and control unit comprises voltage conditioning module, current regulating module and driver module.Threephase potential transformer links to each other via the input of voltage conditioning module with the core processor unit.Threephase current transformer links to each other via the input of current regulating module with the core processor unit.The output of core processor unit links to each other with the unit switch modular unit via driver module.Intelligent measurement and control unit is responsible for conversion and the follow-up signal conditioning of main circuit operating voltage to be controlled and operating current, and the control that divides, closes a floodgate of the high-pressure vacuum breaker of unit switch modular unit, vacuum interrupter and electronic power switch.
The core processor unit comprises digital signal processor and programmable logic processor.Link to each other by the dual port random access memory between digital signal processor and the programmable logic processor.Programmable logic processor is responsible for the sequential logic control during the analog-to-digital conversion, and three-phase operating current, three-phase operating voltage and other analog signal that will collect read with the process subsequent analysis for digital signal processor by the dual port random access memory and process.Digital signal processor is finished preliminary treatment, voltage and current numerical computations, and main circuit operating voltage phase place and the comparison of operating current Phase Tracking of collection signal.
Unit switch state autodiagnosis unit is connected with the core processor unit respectively with the protection monitoring unit.In the utility model preferred embodiment, described unit switch state autodiagnosis unit all is connected with the core processor unit by controller local area network's bus with the protection monitoring unit.Wherein to be responsible for recording the contact position of high-pressure vacuum breaker, vacuum interrupter and electronic power switch be make-and-break status information, operating mechanism energy storage situation, actuating historical record and state estimation information to unit switch module status self-diagnosis unit switches.The protection monitoring unit is used to main circuit to be controlled to realize overcurrent and overvoltage trip protection, the monitoring of electronic power switch driving condition and electronic power switch overcurrent, overvoltage and temperature protection.
In order further to realize the manual control to main circuit to be controlled, also be connected to hand switch on the input of core processor described in the utility model unit, this hand switch is used for the manually break-make instruction of input main circuit to be controlled.
Fig. 3 is the concrete application mode of the designed switching device of the utility model.The control method of a kind of Novel 10 kV switch device that above-mentioned switching device is realized comprises the steps:
(1) after the vacuum interrupter in the unit switch modular unit and electronic power switch are connected mutually, be in parallel with high-pressure vacuum breaker, the two ends of high-pressure vacuum breaker are serially connected with on the main circuit to be controlled as the two ends of switching device body respectively; The closing time of known high-pressure vacuum breaker is Th
k, the combined floodgate dispersiveness of high-pressure vacuum breaker is Δ t
K1, the ON time of electronic power switch is Th
I, the opening time of high-pressure vacuum breaker is Tf
k, the separating brake dispersiveness of high-pressure vacuum breaker is Δ t
K2, the ON time of electronic power switch is Tf
ITh
I=Tf
I, the ON time that adopts different symbols only to represent electronic power switch is only closed a floodgate and the separating brake process for convenience of description;
(2) threephase potential transformer is attempted by on the main circuit to be controlled, and threephase current transformer is serially connected on the main circuit to be controlled or allows main circuit bus to be controlled pass threephase current transformer; Threephase potential transformer is sent into the operating current of the main circuit to be controlled that it detects in real time operating voltage, the threephase current transformer of its main circuit to be controlled that detects in real time respectively in the switching manipulation intelligent controller;
(3) the connection control procedure of main circuit to be controlled is specially:
(3.1) under the main circuit off-state to be controlled, the high-pressure vacuum breaker in the unit switch modular unit is in that gate-dividing state, vacuum interrupter are in gate-dividing state, electronic power switch is in cut-off state;
(3.2) the switching manipulation intelligent controller at first powers on and enters operating state, the operating voltage phase place of switching manipulation intelligent controller real-time tracking main circuit to be controlled, when the operating voltage phase place of main circuit to be controlled enters in the turn-on voltage phase range of establishing in the switching manipulation intelligent controller, the switching manipulation intelligent controller sends instruction, and closed vacuum interrupter, high-pressure vacuum breaker still are in gate-dividing state, electronic power switch and still are in cut-off state, the unactual connection of main circuit to be controlled first;
(3.3) the switching manipulation intelligent controller obtains anticipated optimal set closing moment t by following the tracks of the operating voltage phase place
M, this anticipated optimal set closing moment t
MThe zero passage moment or the whole switching device both sides potential value that are the operating voltage waveform of main circuit to be controlled equate constantly;
(3.4) the switching manipulation intelligent controller is at t
M-Th
I(B of accompanying drawing 4 constantly) sends turn-on command to electronic power switch constantly, and electronic power switch is at t
MConstantly conducting puts in place, and this moment, vacuum interrupter and electronic power switch series arm were at first connected main circuit to be controlled;
(3.5) the switching manipulation intelligent controller is at t
M-Th
k+ Δ t
K1(A of accompanying drawing 4 constantly) sends reclosing command to high-pressure vacuum breaker constantly, and high-pressure vacuum breaker is at t
MTo t
M+ 2 Δ t
K1Closing a floodgate in the time range puts in place, and this moment, the high-pressure vacuum breaker branch road was connected main circuit to be controlled, vacuum interrupter separating brake subsequently, electronic power switch cut-off.
Outstanding advantages and the main purpose of barrier gate process described in the utility model and control method thereof are: rapid, the accurate controlled advantage of performance electronic power switch conducting, accurately the optimum phase of closing, at short notice (2 Δ t are closed in control
K1In hundred microsecond magnitudes) loaded current; At 2 Δ t subsequently
K1Vacuum circuit-breaker closes a floodgate and puts in place in time, bearing great current, and vacuum interrupter separating brake and electronic power switch under low-voltage withdraws from main circuit very much subsequently, increases useful life.Manually identical with automatic closing process main circuit voltage-tracing process, difference is that the closing by hand instruction introduced by the outside, closes in expection phase place pass through a few tens of milliseconds time-delay.
(4) the disconnection control procedure of main circuit to be controlled is specially:
(4.1) under the main circuit on-state to be controlled, the high-pressure vacuum breaker in the unit switch modular unit is in that "on" position, vacuum interrupter are in gate-dividing state, electronic power switch is in cut-off state;
(4.2) the switching manipulation intelligent controller at first powers on and enters operating state, the operating current phase place of switching manipulation intelligent controller real-time tracking main circuit to be controlled, when the operating current phase place of main circuit to be controlled enters in the turn-off current phase range of establishing in the switching manipulation intelligent controller, the switching manipulation intelligent controller sends instruction, and closed vacuum interrupter, high-pressure vacuum breaker still are in "on" position, electronic power switch and still are in cut-off state, the unactual disconnection of main circuit to be controlled first;
(4.3) the switching manipulation intelligent controller obtains constantly t of anticipated optimal set separating brake by following the tracks of the operating current phase place
D, this anticipated optimal set separating brake is t constantly
DThe zero passage moment or the whole switching device both sides potential value that are the operating current waveform of main circuit to be controlled equate constantly;
(4.4) the switching manipulation intelligent controller is at t
D-Tf
k+ Δ t
K2(A of accompanying drawing 5 constantly) sends the separating brake instruction to high-pressure vacuum breaker constantly, and high-pressure vacuum breaker is at t
D-2 Δ t
K2To t
DSeparating brake puts in place in the time range, and this moment, high-pressure vacuum breaker at first disconnected main circuit to be controlled;
(4.5) the switching manipulation intelligent controller is at t
D-Tf
I(B of accompanying drawing 5 constantly) sends turn-on command to electronic power switch constantly, and electronic power switch is at t
DConstantly fully cut-off, this moment vacuum interrupter and electronic power switch series arm because the cut-off of electronic power switch disconnects main circuit to be controlled, vacuum interrupter separating brake subsequently.
Outstanding advantages and the main purpose of separating brake process described in the utility model and control method thereof are: bring into play rapid, the accurate controlled advantage of electronic power switch conducting, accurately control the optimum phase of separating brake, at short notice (2 Δ t
K2In hundred microsecond magnitudes) loaded current; Vacuum interrupter is separating brake under low-voltage very and under the currentless condition, can reduce its capacity limit, selects element with small capacity, increases useful life.Manually identical with automatic brake separating process main circuit voltage-tracing process, difference is that the manual brake separating instruction introduced by the outside, is expecting phase place disjunction main circuit to be controlled through a few tens of milliseconds time-delay.
Claims (5)
1. a Novel 10 kV switch device comprises the switching device body, it is characterized in that: described switching device body mainly is comprised of unit switch modular unit, threephase current transformer, threephase potential transformer and switching manipulation intelligent controller;
The unit switch modular unit comprises high-pressure vacuum breaker, vacuum interrupter and electronic power switch, after wherein vacuum interrupter and electronic power switch are connected mutually, be in parallel with high-pressure vacuum breaker, the two ends of high-pressure vacuum breaker are serially connected with on the main circuit to be controlled as the two ends of switching device body respectively;
Threephase potential transformer is attempted by on the main circuit to be controlled, threephase current transformer is serially connected on the main circuit to be controlled or allows main circuit bus to be controlled pass threephase current transformer, and the output of threephase potential transformer and threephase current transformer links to each other with the input of switching manipulation intelligent controller respectively;
The output of switching manipulation intelligent controller connects respectively the control end of high-pressure vacuum breaker, vacuum interrupter and electronic power switch.
2. a kind of Novel 10 kV switch device according to claim 1, it is characterized in that: the switching manipulation intelligent controller comprises intelligent measurement and control unit and core processor unit;
Intelligent measurement and control unit comprises voltage conditioning module, current regulating module and driver module; Threephase potential transformer links to each other via the input of voltage conditioning module with the core processor unit, threephase current transformer links to each other via the input of current regulating module with the core processor unit, and the output of core processor unit links to each other with the unit switch modular unit via driver module;
The core processor unit comprises digital signal processor and programmable logic processor, links to each other by the dual port random access memory between digital signal processor and the programmable logic processor.
3. a kind of Novel 10 kV switch device according to claim 2; it is characterized in that: the switching manipulation intelligent controller also further comprises unit switch state autodiagnosis unit and/or protection monitoring unit, and this unit switch state autodiagnosis unit is connected with the core processor unit respectively with the protection monitoring unit.
4. a kind of Novel 10 kV switch device according to claim 3 is characterized in that: described unit switch state autodiagnosis unit all is connected with the core processor unit by controller local area network's bus with the protection monitoring unit.
5. a kind of Novel 10 kV switch device according to claim 2 is characterized in that: also be connected to hand switch on the input of core processor unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220082963 CN202651793U (en) | 2012-03-07 | 2012-03-07 | Novel 10kV switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220082963 CN202651793U (en) | 2012-03-07 | 2012-03-07 | Novel 10kV switching device |
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| Publication Number | Publication Date |
|---|---|
| CN202651793U true CN202651793U (en) | 2013-01-02 |
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ID=47420837
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220082963 Expired - Fee Related CN202651793U (en) | 2012-03-07 | 2012-03-07 | Novel 10kV switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647533A (en) * | 2013-12-03 | 2014-03-19 | 桂林航天电子有限公司 | Electronic-switch protection module in hybrid relay |
-
2012
- 2012-03-07 CN CN 201220082963 patent/CN202651793U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647533A (en) * | 2013-12-03 | 2014-03-19 | 桂林航天电子有限公司 | Electronic-switch protection module in hybrid relay |
| CN103647533B (en) * | 2013-12-03 | 2016-10-26 | 桂林航天电子有限公司 | Electrical switch protection module in hybrid relay |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20130307 |