CN1832296A - Automatic input device and control method for emergency power supply of bus for middle-low voltage section factory - Google Patents

Abstract

This invention relates to a low-middle voltage segment bus line standby supply automatic use device of plant, the central processor of said device is connected with an external switch volume input by inputting a photoelectric coupler and connected with conversion circuit RS485, a memory, a programmable logic controller and A/D conversion circuit by an address bus and a data bus, in which, the output of the programmable logic controller is connected with a display and keyboard and connected with the exit of a relay by outputting the photoelectric coupler, the output of an AC input circuit is connected with the input of a filter and operational amplifying circuit, the output of which is connected with the input of the A/D conversion circuit connecting to the address line and the data bus line.

Description

Many section factories of mesolow emergency power supply of bus automatic throw-in equipment and control method

Technical field

The present invention is a kind of automatic throw-in equipment of emergency power supply, realize the function of Fault Isolation and service restoration, the automatic throw-in equipment of emergency power supply that divides the occasion more than two sections to design and develop out at the mesolow auxiliary bus bar belongs to the technical field that power system device is made especially.

Background technology

Automatic throw-in equipment of emergency power supply is widely used in the occasion of the different modes of connection of each electric pressure in the electric power system.The typical application occasion is that two inlet wires, two transformers division operation or an operation one are standby, and therefore conventional automatic throw-in equipment of emergency power supply is designed to satisfy single busbar connection or sectionalized single busbar connection (dividing two sections buses).

The designing requirement of station service (power plant, big-and-middle-sized industrial and mining enterprises etc.) middle voltage bus bar is as follows:

1. power plant 10KV or 6KV bus are generally pressed the stove segmentation, because it is very high that stand-by power supply is dropped into rate request, can not dispose conventional automatic throw-in equipment of emergency power supply, but adopt auxiliary power high-speed transfer device.

2. 400V bus in power plant divides more than two sections or two sections, if adopt conventional automatic throw-in equipment of emergency power supply, needs many of configurations, and also bad cooperation between many table apparatus.

3. consider important load (motor, low factory change etc.) require to hang on the different bus sections, do not influence each other after the fault, the mesolow auxiliary bus bar of big-and-middle-sized industrial and mining enterprises often divides more than three sections, install network interconnecting circuit between every section bus, if adopt conventional automatic throw-in equipment of emergency power supply, need many of configurations, and also bad cooperation between many table apparatus.

Therefore need a kind of automatic throw-in equipment of emergency power supply at many segmentations of station service middle voltage bus bar characteristics.

Summary of the invention

Technical problem: the purpose of this invention is to provide a kind of many section factories of mesolow emergency power supply of bus automatic throw-in equipment and control method, solve present many section factories of mesolow bus and adopt the inking device of automatic throw-in equipment of emergency power supply generation too much, install the problem of mutual bad cooperation; Reach by an automatic throw-in equipment of emergency power supply and realize that the stand-by power supply of many section factories of mesolow bus drops into the purpose of function automatically.

Technical scheme: many section factories of mesolow emergency power supply of bus automatic throw-in equipment is the center with the center processor, center processor joins by input optocoupler and the input of external switch amount, center processor and RS485 change-over circuit join, join with memory, programmable logic controller (PLC), A/D change-over circuit respectively by address bus and data/address bus, the output of programmable logic controller (PLC) joins with display, keyboard respectively, and the output of programmable logic controller (PLC) is also succeeded the electrical equipment outlet by the output photoelectrical coupler; The output termination filtering of ac input circuit and the input of discharge circuit, the output termination of filtering and discharge circuit connects the input of A/D change-over circuit, and the A/D change-over circuit also joins with address bus and data/address bus respectively.

On concrete connected mode, with the center processor is the center, " TPUC0～TPUC10 " of the cpu chip in the center processor " U1 " end links to each other with " TPUC0～TPUC10 " end of 11 photoelectricity coupling circuits " U5 " in the input optocoupler respectively, " KI0～KI10 " end of 11 photoelectricity coupling circuits " U5 " joins with the input of external switch amount, handles the switching value input signal by center processor; Cpu chip in the center processor " U1 " by synchronous serial interface " SPI " promptly " MOSI, MISO, SCK " end hold with " MOSI, MISO, the SCK " of SPI/UART transducer " U8 " and link to each other, " TX, RX, RST/ " end correspondence of SPI/UART transducer " U8 " is linked " DI, RO, RE/ " end of RS485 transducer " U9 ", realizes and outside function of carrying out communication; It is the output of ac input circuit that the input of filtering and discharge circuit " AII1～AII8 " connects the analog quantity input, " CHIA～CH4B " end of two change-over circuits " U2 " in the output of filtering and discharge circuit " AI1～AI8 " and the A/D change-over circuit links to each other, the data/address bus of the cpu chip " U1 " in the output of two change-over circuits " U2 " and the center processor is connected, and is handled the sampled value of of ac by center processor; The data/address bus of center processor and address bus link to each other with storage chip " U10, U11 " corresponding port in the memory (4) respectively; CPLD chip " U3 " in the programmable logic controller (PLC) "/RD ,/WR ,/LCDRST ,/LCDCS " end link to each other with display, "/the KBCS " of CPLD chip " U3 " end links to each other with keyboard "/KBCS ", and the data/address bus of the cpu chip " U1 " in the data/address bus of display, keyboard and the center processor links to each other; " DO0～DO10 " of the CPLD chip " U3 " in programmable logic controller (PLC) end is connected with " DO0～DO10 " end of 11 output photoelectricity coupling circuits " U4 " in the output photoelectrical coupler respectively, and " D0～D10 " end of output photoelectricity coupling circuit " U4 " exports with relay at last and is connected.

Its control method is after device powers on, and in initialize routine software and hardware resources is carried out initialization definitions, in master control, carries out hardware check, man-machine interface demonstration and keyboard operation, serial communication interface communication; Master control receives sampling according to the fixing sampling period and interrupts entering controlling of sampling, carries out of ac collection and switch acquisition in controlling of sampling, and stand-by power supply drops into control method automatically and is:

1.) according to of ac that calculates in the controlling of sampling and switching value, judge whether charging finishes,

2.) charging finishes, and whether the judgment task power supply dead electricity,

3.) working power dead electricity, the switch of tripping working power is waited for after the complete tripping of working power switch, the switch of the stand-by power supply that goes again to close, wait for that Backup Power Switch is closed fully after, finish stand-by power supply and drop into program automatically, return master control; If the working power switch does not have tripping or Backup Power Switch not to close, finish stand-by power supply equally and drop into control automatically, return master control.

Mentality of designing of the present invention is: the mesolow auxiliary bus bar divides the occasion of multistage, fault bus except can and adjacent bus between realize that stand-by power supply drops into the function automatically, also want to realize when the stand-by power supply of adjacent bus for some reason is out of service and the stand-by power supply of being separated by between the bus drops into function automatically.From the planning and designing of station service, auxiliary bus bar generally divides 2～6 sections; Simultaneously, be subjected to the restriction of hardware cost and physical dimension, the hardware resource of device also is conditional.The hardware resource of device divides 6 sections maximization to design according to auxiliary bus bar, and software is discerned the operation conditions of each bar bus automatically, participates in stand-by power supply and drops into function automatically to determine which bus.For example:

1. when auxiliary bus bar divides two sections, device is gathered two groups of of acs, every group of of ac has 5, is respectively the three-phase voltage of every section bus, the primary voltage and the inlet wire current of every transformer (or every inlet wire), and these of acs can reflect the ruuning situation of bus; Gather the position of the switch auxiliary contact of three circuit breakers simultaneously, the position contact of every way switch has two pairs, is respectively to close a signal and jump a position signal, and these signals can reflect that (circuit breaker closes, and closing a signal is 1, and jumping a position signal is 0 for deciliter state of circuit breaker; The circuit breaker branch, jumping the position signal is 1, closing a signal is 0); Also need to provide 6 pairs of breaker tripping and closing output contacts to receive in the closing loop of three circuit breakers, device can be controlled deciliter state of circuit breaker by driving these output contacts.When certain section busbar fault, the of ac of the reflection bus operation characteristic that collects by calculating, it is that fault has taken place which bar bus that device can be judged rapidly, drive the tripping operation output contact then, the circuit breaker tripping of control fault bus correspondence is confirmed the tripping of this circuit breaker by the jumping position signal 0 → 1 of judging this circuit breaker, isolated fault, the circuit breaker of controlling the auxiliary bus-bar correspondence again closes, and confirms that by the signal 0 → 1 that closes of judging this circuit breaker this circuit breaker closes service restoration.

2. when auxiliary bus bar divided three sections, the of ac that device is gathered increased by one group, and the killer switch position auxiliary contact of collection increases totally 4 pairs of two-way, and corresponding breaker tripping and closing output contact increases by 4 pairs, did not need additionally to increase device or expanded hardware resource.When certain section busbar fault, device tripping fault bus, the adjacent auxiliary bus-bar that closes restores electricity; In addition, because stand-by power supply has fault when maintenance is therefore out of service, the auxiliary bus-bar that can close and be separated by restores electricity when adjacent auxiliary bus-bar.

Consider that the low pressure auxiliary bus bar in design time cost-saving, does not have the configuration voltages instrument transformer, the direct motion device of busbar voltage 400V, therefore the AC voltage sampling circuit of device will design and support to be up to 400V.

Beneficial effect: the occasion of dividing multistage at the mesolow auxiliary bus bar, fault bus except can and adjacent bus between realize that stand-by power supply drops into the function automatically, can also realize when the stand-by power supply of adjacent bus for some reason is out of service and the stand-by power supply of being separated by between the bus drops into function automatically.

Hardware resource divides 6 sections maximization to design according to auxiliary bus bar, and software is discerned the operation conditions of each bar bus automatically, participates in stand-by power supply and drops into function automatically to determine which bus.

1.10KV or the 6KV bus all can the configuration voltages instrument transformer, busbar voltage is transformed into 100V taps into device; And the 400V bus generally is unworthy of voltage transformer, and the 400V busbar voltage directly taps into device.The maximum 400V that supports of the design's voltage input had both satisfied the 400V pattern, also compatible 100V pattern, highly versatile.

2. all working methods are the two-way switching of support performance power supply and stand-by power supply all, be to automatically switch to stand-by power supply after the working power fault dead electricity, this moment, stand-by power supply was upgraded to working power, the working power of fault is reduced to stand-by power supply after maintenance restores electricity, next time, working power automatically switched to stand-by power supply again during fault.

3. the working method of coming switching device shifter that Chang Gui automatic throw-in equipment of emergency power supply will be artificial according to different system wiring modes is safeguarded very inconvenient.The present invention can the automatic tracking system mode of connection variation, intelligence is switched the working method that puts into operation, need not manual intervention after device puts into operation.

Description of drawings

Fig. 1 is the circuit block diagram of device.

Fig. 2 is the circuit theory diagrams of CPU and CPLD.

Fig. 3 is the circuit theory diagrams of of ac acquisition module.

Fig. 4 is the circuit theory diagrams of communication module and switching value input/output module.

Fig. 5 is the circuit theory diagrams of keyboard operation module.

Fig. 6 is the circuit theory diagrams of FLASH and SRAM.

Fig. 7 is the control flow chart of device.

Fig. 8 is the 6KV auxiliary bus bar electrical wiring schematic diagram of (dividing three sections).

Fig. 9 is the elementary diagram of device.

Figure 10 is the logic diagram that stand-by power supply drops into automatically between 1#, the 2# transformer.

Figure 11 is the logic diagram that stand-by power supply drops into automatically between 1#, the 3# transformer.

Figure 12 is the logic diagram one that stand-by power supply drops into automatically between 2#, the 3# transformer.

Figure 13 is the logic diagram two that stand-by power supply drops into automatically between 2#, the 3# transformer.

Have among the above figure: RS485 transducer 1, input optocoupler 2, center processor (CPU) 3, memory 4, programmable logic controller (PLC) (CPLD) 5, output photoelectrical coupler 6, relay outlet 7, display 8, keyboard 9, A/D change-over circuit 10, filtering and discharge circuit 11, ac input circuit 12.

Embodiment

Hardware of the present invention is realized as shown in Figure 1, is comprised center processor (CPU), programmable logic controller (PLC) (CPLD), storage chip FLASH, SRAM, RS485 communication module, switching input module, switching value output module, of ac acquisition module, keyboard operation module.

This device is the center with center processor 3, center processor 3 joins by input optocoupler 2 and the input of external switch amount, center processor 3 joins with RS485 change-over circuit 1, join with memory 4, programmable logic controller (PLC) 5, A/D change-over circuit 10 respectively by address bus and data/address bus, the output of programmable logic controller (PLC) 5 joins with display 8, keyboard 9 respectively, and the output of programmable logic controller (PLC) 5 is also succeeded electrical equipment outlet 7 by output photoelectrical coupler 6; The output termination filtering of ac input circuit 12 and the input of discharge circuit 11, the output termination of filtering and discharge circuit 11 connects the input of A/D change-over circuit 10, and A/D change-over circuit 10 also joins with address bus and data/address bus respectively.

With center processor 3 is the center, " TPUC0～TPUC10 " of the cpu chip in the center processor 3 " U1 " end links to each other with " TPUC0～TPUC10 " end of 11 photoelectricity coupling circuits " U5 " in the input optocoupler 2 respectively, " KI0～KI10 " end of 11 photoelectricity coupling circuits " U5 " joins with the input of external switch amount, handles the switching value input signal by center processor 3; Cpu chip in the center processor 3 " U1 " by synchronous serial interface " SPI " promptly " MOSI, MISO, SCK " end hold with " MOSI, MISO, the SCK " of SPI/UART transducer " U8 " and link to each other, " TX, RX, RST/ " end correspondence of SPI/UART transducer " U8 " is linked " DI, RO, RE/ " end of RS485 transducer " U9 ", realizes and outside function of carrying out communication; It is the output of ac input circuit 12 that the input of filtering and discharge circuit 11 " AII1～AII8 " connects the analog quantity input, " CHIA～CH4B " end of two change-over circuits " U2 " in the output of filtering and discharge circuit 11 " AI1～AI8 " and the A/D change-over circuit 10 links to each other, the data/address bus DB BUS of the cpu chip " U1 " in the output of two change-over circuits " U2 " and the center processor 3 is connected, and is handled the sampled value of of ac by center processor 3; The data/address bus DB BUS of center processor 3 and address bus ADDRESS BUS link to each other with storage chip " U10, U11 " corresponding port in the memory 4 respectively; CPLD chip " U3 " in the programmable logic controller (PLC) 5 "/RD ,/WR ,/LCDRST ,/LCDCS " end link to each other with display 8, "/the KBCS " of CPLD chip " U3 " end links to each other with keyboard 9 "/KBCS ", and the data/address bus DB BUS of the cpu chip " U1 " in the data/address bus DB BUS of display 8, keyboard 9 and the center processor 3 links to each other; " DO0～DO10 " of the CPLD chip " U3 " in the programmable logic controller (PLC) 5 end is connected with " DO0～DO10 " end of 11 output photoelectricity coupling circuits " U4 " in the output photoelectrical coupler 6 respectively, and " D0～D10 " end of output photoelectricity coupling circuit " U4 " exports 7 with relay at last and is connected.

The operation principle of each module is as follows:

1.32 the CPU of position, addressing space reaches the 16M byte, has higher execution speed and stronger function, protects logical operation, finishes logout, failure wave-recording simultaneously.

2.CPLD be used for carrying out logic control.

3.FLASH be used for program and the protection definite value and the protection incident of storing unit operation.

4.SRAM as clock chip and deposit the remote signalling incident.

5. of ac acquisition module.Of ac such as voltage, electric current at first is transformed into the small voltage signal through instrument transformer, passes through amplifier then, enter the A/D converter conversion after, enter CPU.

6. switching input module.Open into amount and isolate, enter CPU, handle by CPU again and open into the amount state through photoelectricity.

7. switching value output module.CPU gives an order, and carries out logic control by CPLD and imports the amount of leaving, and isolates through photoelectricity to be transformed into+output of 24V signal again.

8. keyboard operation module.The button closure signal links to each other with the data/address bus of CPU by behind the bus buffer, comes processing signals by CPU.

9.RS485 communication module.Behind the synchronous serial interface of CPU (SPI) the process SPI/UART transducer, carry out communication through RS485 transducer and outside again.

Fig. 2～Fig. 6 is main circuit theory diagrams, and main circuit devcie model is as follows:

The element code name	The function title	Concrete model
			U1	Center processor (CPU)	MC68332ACFC16(132)
U2	AD converter	MAX125
			U3	Programmable logic controller (PLC) (CPLD)	XC95108
U4，U5	The photoelectricity coupling circuit	TLP521
			U6	Eight bus buffers	74HC540
U7	Eight bus transceivers (three-state)	SN74AHC245
			U8	The SPI/UART transducer	MAX3100CEE
U9	The RS485 transducer	MAX485
			U10	The FLASH storage chip	AM29F400BT
U11	The SRAM storage chip	IS61C1024L

Control of the present invention realizes as shown in Figure 7, after device powers on, in initialize routine software and hardware resources is carried out initialization definitions.In main program, carry out hardware check, man-machine interface demonstration and keyboard operation, serial communication interface communication.Master control receives sampling according to the fixing sampling period and interrupts entering controlling of sampling, carries out of ac collection and switch acquisition in controlling of sampling.Be that stand-by power supply drops into control method automatically in the frame of broken lines:

1. according to of ac that calculates in the controlling of sampling and switching value, judge whether charging finishes.

2. charging finishes, and whether the judgment task power supply dead electricity.

3. working power dead electricity, the switch of tripping working power is waited for after the complete tripping of working power switch, the switch of stand-by power supply again goes to close, after waiting for that Backup Power Switch is closed fully, finish stand-by power supply and drop into program (stand-by power supply drops into success automatically) automatically, return master control; If the working power switch does not have tripping or Backup Power Switch not to close, finish stand-by power supply equally and drop into control (stand-by power supply drops into failure automatically) automatically, return master control.

Suppose that auxiliary bus bar divides three sections, as shown in Figure 8, device possesses following feature to external connection:

1. of ac connects three sections busbar voltage (U _A1, U _B1, U _C1, U _A2, U _B2, U _C2, U _A3, U _B3, U _C3), the primary voltage (U of three inlet wires _L1, U _L2, U _L3) and inlet wire current (I _L1, I _L2, I _L3).

2. the switching value input connects the position of the switch auxiliary contact of 5 circuit breakers.

3. switching value output connects the operation circuit of 5 circuit breakers.

As shown in Figure 9, three sections busbar voltage U _A1, U _B1, U _C1, U _A2, U _B2, U _C2, U _A3, U _B3, U _C3Receive respectively on XDL-1, XDR-1, XDL-2, XDR-2, XDL-3, XDR-3, XDL-4, XDR-4, XDL-5, XDR-5, XDL-6, the XDR-6 terminal of device.Article three, the primary voltage U of inlet wire _L1, U _L2, U _L3Receive respectively on XDL-7, XDR-7, XDL-8, XDR-8, XDL-9, the XDR-9 terminal of device.Article three, the inlet wire current I of inlet wire _L1, I _L2, I _L3Receive respectively on XDL-10, XDR-10, XDL-11, XDR-11, XDL-12, the XDR-12 terminal of device.The position of the switch auxiliary contact of 1DL～5DL (closing a signal and jumping a position signal of switch) is received respectively on XA2-7, XA2-8, XA2-9, XA2-10, XA2-11, XA2-12, XC2-11, XC2-12, XC2-13, the XC2-14 terminal of device.Breaker tripping and closing lead-out terminal XC1-1, XC1-2, XC1-3, XC1-4, XC1-5, XC1-6, XC1-7, XC1-8, XC1-9, XC1-10, XC1-11, XC1-12, XC1-13, XC1-14, XC1-15, XC1-16, XC2-1, XC2-2, XC2-3, XC2-4 receive respectively in the jump, closing loop of operation circuit of 1DL～5DL.The RS485 communication cable is received respectively on XB-1, XB-2, XB-3, the XB-4 terminal.

As shown in figure 10,1# transformer and 2# transformer division operation, and this moment the 5DL branch, realize between 1# transformer and the 2# transformer that stand-by power supply drops into function automatically.

As shown in figure 11,1# transformer and 3# transformer division operation, and this moment the 4DL branch, realize between 1# transformer and the 3# transformer that stand-by power supply drops into function automatically.

As shown in figure 12,2# transformer (band I section and II section bus) and 3# transformer (band III section bus) division operation, and this moment 4DL close, the 5DL branch, the realization stand-by power supply drops into function automatically between 2# transformer and the 3# transformer.

As shown in figure 13,2# transformer (band II section bus) and 3# transformer (band I section and III section bus) division operation, and 4DL branch, 5DL close at this moment, realize between 2# transformer and the 3# transformer that stand-by power supply drops into function automatically.

Claims (3)

1, a kind of many section factories of mesolow emergency power supply of bus automatic throw-in equipment, it is characterized in that this device is the center with center processor (3), center processor (3) joins by input optocoupler (2) and the input of external switch amount, center processor (3) joins with RS485 change-over circuit (1), by address bus and data/address bus respectively with memory (4), programmable logic controller (PLC) (5), A/D change-over circuit (10) joins, the output of programmable logic controller (PLC) (5) respectively with display (8), keyboard (9) joins, and the output of programmable logic controller (PLC) (5) is also succeeded electrical equipment outlet (7) by output photoelectrical coupler (6); The input of the output termination filtering of ac input circuit (12) and discharge circuit (11), the output termination of filtering and discharge circuit (11) connects the input of A/D change-over circuit (10), and A/D change-over circuit (10) also joins with address bus and data/address bus respectively.

2, many section factories of mesolow emergency power supply of bus automatic throw-in equipment according to claim 1, it is characterized in that with center processor (3) be the center, " TPUC0～TPUC10 " of the cpu chip " U1 " in the center processor (3) end links to each other with " TPUC0～TPUC10 " end of 11 photoelectricity coupling circuits " U5 " in the input optocoupler (2) respectively, " KI0～KI10 " end of 11 photoelectricity coupling circuits " U5 " joins with the input of external switch amount, handles the switching value input signal by center processor (3); Cpu chip " U1 " in the center processor (3) by synchronous serial interface " SPI " promptly " MOSI, MISO, SCK " end hold with " MOSI, MISO, the SCK " of SPI/UART transducer " U8 " and link to each other, " TX, RX, RST/ " end correspondence of SPI/UART transducer " U8 " is linked " DI, RO, RE/ " end of RS485 transducer " U9 ", realizes and outside function of carrying out communication; It is the output of ac input circuit (12) that the input " AII1～AII8 " of filtering and discharge circuit (11) connects the analog quantity input, " CHIA～CH4B " end of two change-over circuits " U2 " in the output " AI1～AI8 " of filtering and discharge circuit (11) and the A/D change-over circuit (10) links to each other, the data/address bus (DB BUS) of the cpu chip " U1 " in the output of two change-over circuits " U2 " and the center processor (3) is connected, and is handled the sampled value of of ac by center processor (3); The data/address bus of center processor (3) (DB BUS) and address bus (ADDRESS BUS) link to each other with storage chip " U10, U11 " corresponding port in the memory (4) respectively; CPLD chip " U3 " in the programmable logic controller (PLC) (5) "/RD ,/WR ,/LCDRST ,/LCDCS " end link to each other with display (8), "/the KBCS " of CPLD chip " U3 " end links to each other with keyboard (9) "/KBCS ", and the data/address bus (DB BUS) of the cpu chip " U1 " in the data/address bus (DBBUS) of display (8), keyboard (9) and the center processor (3) links to each other; " DO0～DO10 " of the CPLD chip " U3 " in the programmable logic controller (PLC) (5) end is connected with " DO0～DO10 " end of 11 output photoelectricity coupling circuits " U4 " in the output photoelectrical coupler (6) respectively, and " D0～D10 " end of output photoelectricity coupling circuit " U4 " exports (7) with relay at last and is connected.

3, a kind of control method of many section factories of mesolow emergency power supply of bus automatic throw-in equipment as claimed in claim 1, after it is characterized in that device powers on, in initialize routine, software and hardware resources is carried out initialization definitions, in master control, carry out hardware check, man-machine interface demonstration and keyboard operation, serial communication interface communication; Master control receives sampling according to the fixing sampling period and interrupts entering controlling of sampling, carries out of ac collection and switch acquisition in controlling of sampling, and stand-by power supply drops into control method automatically and is:

1.) according to of ac that calculates in the controlling of sampling and switching value, judge whether charging finishes,

2.) charging finishes, and whether the judgment task power supply dead electricity,

3.) working power dead electricity, the switch of tripping working power is waited for after the complete tripping of working power switch, the switch of the stand-by power supply that goes again to close, wait for that Backup Power Switch is closed fully after, finish stand-by power supply and drop into program automatically, return master control; If the working power switch does not have tripping or Backup Power Switch not to close, finish stand-by power supply equally and drop into control automatically, return master control.

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