CN110707825A - Ring main unit programmed control system and method - Google Patents
Ring main unit programmed control system and method Download PDFInfo
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- CN110707825A CN110707825A CN201911102823.4A CN201911102823A CN110707825A CN 110707825 A CN110707825 A CN 110707825A CN 201911102823 A CN201911102823 A CN 201911102823A CN 110707825 A CN110707825 A CN 110707825A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002955 isolation Methods 0.000 claims abstract description 84
- 238000012423 maintenance Methods 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 17
- 230000003993 interaction Effects 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 206010063385 Intellectualisation Diseases 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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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
- H02H7/08—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 for dynamo-electric motors
- H02H7/085—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 for dynamo-electric motors against excessive load
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/14—Protecting elements, switches, relays or circuit breakers
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Abstract
The invention relates to a ring main unit programmed control system and a method, which have local operation and remote operation functions, wherein the local operation can issue a programmed control command and a single-step operation command to a circuit breaker, an isolation knife and a grounding switch, and the remote operation can also issue the programmed control command and the single-step operation command to the circuit breaker, the isolation knife and the grounding switch, thereby realizing the programmed control of the local operation and the remote operation, realizing the intellectualization and the automation of the ring main unit control system, avoiding various problems caused by manual operation and improving the safety and reliability of the system. In addition, the invention obtains the real-time current of the isolation knife and the grounding switch motor through the motor current acquisition module, and switches on and off the motor power supply by judging whether the current exceeds the locked rotor fixed value, thereby protecting the motor from being burnt out, prolonging the service life of the motor and ensuring the normal operation of the system.
Description
Technical Field
The invention relates to the technical field of ring main units, in particular to a ring main unit programmed control system and method.
Background
At present, the looped network cabinet generally relies on the manual operation of operating personnel to the control of circuit breaker, isolation switch and earthing switch, and degree automatic, intelligent is low. In addition, during the manual operation of the circuit breaker, the disconnecting switch or the grounding switch, the operator may have a situation that the switching-on is not in place or the switching-off is not in place, so that the normal operation of the system is influenced, and even the system is damaged due to a fault.
In view of the above, the present invention is conceived based on the problems of the ring main unit control.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a ring main unit programmed control system and method, which can intelligently control a circuit breaker, an isolation switch and a grounding switch to carry out electric control on/off, and improve the safety and reliability of the ring main unit.
In order to achieve the purpose, the invention adopts the technical scheme that:
a ring main unit programmed control system comprises a microprocessor, a communication interface, a human-computer interaction module, a switching value input module, a circuit breaker control module, an isolation knife control module, a grounding switch control module, a motor current sampling module and a motor hardware protection module, wherein the human-computer interaction module, the switching value input module, the communication interface, the circuit breaker control module, the isolation knife control module, the grounding switch control module, the motor current sampling module and the motor hardware protection module are all connected with the microprocessor; wherein,
the communication interface is used for receiving a remote operation command group sent by the upper computer and sending the remote operation command group to the microprocessor;
the human-computer interaction module is used for inputting a local operation command group and sending the local operation command group to the microprocessor; the remote operation command set and the local operation command set comprise a programming operation command and a single-step operation command; the human-computer interaction module is also used for displaying the running state of the control system and the states of the circuit breaker, the disconnecting switch and the grounding switch;
the switching value input module is used for acquiring the states of the circuit breaker, the disconnecting switch and the grounding switch and sending the states to the microprocessor;
the motor current acquisition module is used for acquiring real-time current of the isolation knife and the grounding switch motor and transmitting the current to the microprocessor;
the microprocessor is used for analyzing and processing the remote operation command group and the local operation command group to acquire a specific operation command; when the specific operation command is a single-step operation command, the microprocessor directly issues the single-step operation command to the circuit breaker control module, the isolation switch control module or the grounding switch control module; when the specific operation command is a programmed operation command, the microprocessor transmits the operation command contained in the programmed operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module according to the state obtained by the switch input quantity; the microprocessor is also used for judging whether the real-time current of the isolating knife and the grounding switch motor exceeds a locked-rotor fixed value or not, and when the real-time current exceeds the locked-rotor fixed value, the microprocessor issues an instruction to close the isolating knife and the grounding switch motor;
the circuit breaker control module is used for receiving an operation command issued by the microprocessor and controlling an electric operation unit of the circuit breaker according to the operation command so as to control the circuit breaker to switch on or switch off;
the isolation knife control module is used for receiving an operation command issued by the microprocessor and controlling an electric operation unit of the isolation knife according to the operation command so as to control the isolation knife to switch on or switch off;
the grounding switch control module is used for receiving an operation command sent by the microprocessor and controlling an electric operation unit of the grounding switch according to the operation command so as to control the grounding switch to switch on or switch off;
and the motor hardware protection module is used for controlling the on-off of the motor by hardware and feeding the notification back to the microprocessor.
The control system also comprises an event recording module which is connected with the microprocessor and used for storing fault records, fault motor current curves, event records, remote operation records and local operation records.
The program operation command has twelve groups, which are respectively:
run status → maintenance ground, the command set includes three operation commands that act in sequence: the breaker is opened, the isolation knife is opened and the grounding switch is closed;
maintenance ground → run state, the command set includes three operational commands acting in sequence: the grounding switch is opened, the isolation knife is closed and the breaker is closed;
run state → cold standby state, the command set includes two operational commands that act in sequence: the breaker is opened and the isolation knife is opened;
cold standby → run state, the command set includes two operational commands acting in sequence: closing an isolation knife and a breaker;
hot standby → maintenance ground, the command set includes two operation commands that act in sequence: the isolation knife is opened and the grounding switch is closed;
ground → hot standby status is maintained, the command set includes two operation commands acting in sequence: the grounding switch is opened and the isolation knife is closed;
run state → hot standby state, the command set includes an operation command: opening a breaker;
hot standby → run status, the command set includes an operation command: switching on a breaker;
hot standby → cold standby, the command set includes an operation command: separating the brake by an isolation knife;
cold standby → hot standby, the command set includes an operation command: closing the isolating knife;
cold standby status → maintenance ground, the command set includes an operation command: switching on the grounding switch;
maintenance ground → cold standby state, the set of commands comprising an operation command: the grounding switch is opened.
The single-step operation command comprises six groups of commands which are respectively as follows: the circuit breaker is switched on, the circuit breaker is switched off, the isolation knife is switched on, the isolation knife is switched off, the grounding switch is switched on, and the grounding switch is switched off.
The model of the microprocessor is STM32F103RBT 6.
A ring main unit programmed control method is realized by adopting the ring main unit control system, and comprises the following steps:
step 1, judging whether the ring main unit has an electric five-prevention execution condition, and if so, entering step 2;
step 2, inputting a local operation command group through a human-computer interaction module, or receiving a remote operation command group through a communication interface;
step 3, analyzing and processing the local operation command group or the remote operation command group to obtain a specific operation command, and when the specific operation command is a single-step operation command, directly sending the single-step operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module by the microprocessor to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching on and off operations;
when the specific operation command is a programmed operation command, the microprocessor sends the operation command contained in the programmed operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module according to the state obtained by the switch input quantity, and controls the circuit breaker, the disconnecting switch or the grounding switch to carry out switching-on and switching-off operations;
collecting the current of the isolation knife and the grounding switch motor in real time in the process of switching on or switching off the isolation knife and the grounding switch, judging whether the current exceeds a locked rotor fixed value, and if so, switching off the motor;
step 4, completing the operation command, and turning off the motor;
and 5, displaying the running state of the control system, and displaying the switching-on and switching-off states of the circuit breaker, the disconnecting switch and the grounding switch.
When the motor stops because the current of the motor exceeds a locked-rotor fixed value, storing the fault record and a fault motor current curve;
when the microprocessor receives the remote operation command group, storing the remote operation record;
when the microprocessor receives the local operation command group, storing the local operation record;
and storing the switching-on/off signal deflection event records of the circuit breaker, the isolating switch and the grounding switch in the operation process according to the operation command.
The program operation command has twelve groups, which are respectively:
run status → maintenance ground, the command set includes three operation commands that act in sequence: the breaker is opened, the isolation knife is opened and the grounding switch is closed;
maintenance ground → run state, the command set includes three operational commands acting in sequence: the grounding switch is opened, the isolation knife is closed and the breaker is closed;
run state → cold standby state, the command set includes two operational commands that act in sequence: the breaker is opened and the isolation knife is opened;
cold standby → run state, the command set includes two operational commands acting in sequence: closing an isolation knife and a breaker;
hot standby → maintenance ground, the command set includes two operation commands that act in sequence: the isolation knife is opened and the grounding switch is closed;
ground → hot standby status is maintained, the command set includes two operation commands acting in sequence: the grounding switch is opened and the isolation knife is closed;
run state → hot standby state, the command set includes an operation command: opening a breaker;
hot standby → run status, the command set includes an operation command: switching on a breaker;
hot standby → cold standby, the command set includes an operation command: separating the brake by an isolation knife;
cold standby → hot standby, the command set includes an operation command: closing the isolating knife;
cold standby status → maintenance ground, the command set includes an operation command: switching on the grounding switch;
maintenance ground → cold standby state, the set of commands comprising an operation command: the grounding switch is opened.
When the specific operation command analyzed by the microprocessor is a program operation command, and the program operation command includes more than two operation commands acting in sequence, the following operations are performed:
(1) the microprocessor transmits a first operation command in the programmed operation command to the circuit breaker control module, the isolating switch control module or the grounding switch control module to control the switching-on and switching-off operations of the circuit breaker, the isolating switch or the grounding switch;
(2) the switch input quantity module acquires the switching-on and switching-off states of the circuit breaker, the disconnecting switch or the grounding switch controlled by the first operation instruction in real time, stops the first operation instruction when the switching-on and switching-off states are not correct, waits for the microprocessor to send the next operation instruction of the programmed operation instruction to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module, and continues to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching-on and switching-off operations;
(3) and (5) repeating the step (2) until the execution of the programming operation command is finished.
The single-step operation command comprises six groups of commands which are respectively as follows: the circuit breaker is opened, the circuit breaker is closed, the isolation knife is opened, the isolation knife is closed, the grounding switch is opened, and the grounding switch is closed.
After the scheme is adopted, the ring main unit control system has the functions of local operation and remote operation, the local operation can issue the programmed control command and the single-step operation command to the circuit breaker, the isolating knife and the grounding switch, and the remote operation can also issue the programmed control command and the single-step operation command to the circuit breaker, the isolating knife and the grounding switch, so that the programmed control of the local operation and the remote operation is realized, the intellectualization and the automation of the ring main unit control system are realized, a plurality of problems caused by manual operation are avoided, and the safety and the reliability of the system are improved. In addition, the invention obtains the real-time current of the isolation knife and the grounding switch motor through the motor current acquisition module, and switches on and off the motor power supply by judging whether the current exceeds the locked rotor fixed value, thereby protecting the motor from being burnt out, prolonging the service life of the motor and ensuring the normal operation of the system.
Drawings
FIG. 1 is a schematic block diagram of a control system of the present invention.
Detailed Description
As shown in fig. 1, the invention discloses a ring main unit programmed control system, which comprises a microprocessor, a communication interface, a human-computer interaction module, a switching value input module, a circuit breaker control module, an isolation switch control module, a grounding switch control module, a motor current sampling module and a motor hardware protection module, wherein the human-computer interaction module, the switching value input module, the communication interface, the circuit breaker control module, the isolation switch control module, the grounding switch control module, the motor current sampling module and the motor hardware protection module are all connected with the microprocessor.
The communication interface is used for receiving a remote operation command group sent by the upper computer and sending the remote operation command group to the microprocessor. The communication interface can adopt an RS485 communication interface, and the RS485 communication interface adopts an open communication protocol, so that the SCADA function is conveniently realized.
The human-computer interaction module is used for inputting a local operation command group and sending the local operation command group to the microprocessor; the human-computer interaction module is also used for displaying the running state of the control system and the states of the circuit breaker, the disconnecting switch and the grounding switch.
The remote operation command set and the local operation command set comprise a programming operation command and a single step operation command. Wherein, the programming operation command has twelve groups, which are respectively: run status → maintenance ground, the command set includes three operation commands that act in sequence: the breaker is opened, the isolation knife is opened and the grounding switch is closed. Maintenance ground → run state, the command set includes three operational commands acting in sequence: the grounding switch is used for switching off, the isolating knife is used for switching on and the breaker is used for switching on. Run state → cold standby state, the command set includes two operational commands that act in sequence: the breaker is opened, and the isolation knife is opened. Cold standby → run state, the command set includes two operational commands acting in sequence: closing of the isolation knife and closing of the breaker. Hot standby → maintenance ground, the command set includes two operation commands that act in sequence: the isolation knife is opened and the grounding switch is closed. Ground → hot standby status is maintained, the command set includes two operation commands acting in sequence: the grounding switch is opened and the isolation knife is closed. Run state → hot standby state, the command set includes an operation command: and (5) opening the breaker. Hot standby → run status, the command set includes an operation command: and closing the circuit breaker. Hot standby → cold standby, the command set includes an operation command: and (5) separating the brake by an isolation knife. Cold standby → hot standby, the command set includes an operation command: and closing the isolating knife. Cold standby status → maintenance ground, the command set includes an operation command: and closing the grounding switch. Maintenance ground → cold standby state, the set of commands comprising an operation command: the grounding switch is opened. And the single step operation command group comprises six groups of commands, which are respectively: the circuit breaker is opened, the circuit breaker is closed, the isolation knife is opened, the isolation knife is closed, the grounding switch is opened, and the grounding switch is closed.
And the switching value input module is used for acquiring the states of the circuit breaker, the disconnecting switch and the grounding switch and sending the states to the microprocessor. The state value obtained by the switching value input module is used for judging whether the previous command in the program control command is successfully executed or not, and when the previous command in the program control command is successfully executed, the next command can be continuously executed until the program operation command is completely executed.
The microprocessor is used for analyzing and processing the remote operation command group and the local operation command group to acquire a specific operation command; when the specific operation command is a single-step operation command, the microprocessor directly issues the single-step operation command to the circuit breaker control module, the isolation switch control module or the grounding switch control module; when the specific operation command is a programmed operation command, the microprocessor issues the operation command contained in the programmed operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module according to the state obtained by the switch input quantity. And after the circuit breaker control module receives an operation command sent by the microprocessor, the circuit breaker control module controls an electric operation unit of the circuit breaker according to the operation command so as to control the circuit breaker to switch on or switch off. After the isolating knife control module receives an operation command issued by the microprocessor, the electric operation unit of the isolating knife is controlled according to the operation command so as to control the isolating knife to switch on or switch off. And after receiving the operation command sent by the microprocessor, the grounding switch control module controls the electric operation unit of the grounding switch according to the operation command so as to control the grounding switch to switch on or switch off.
And the motor current acquisition module is used for acquiring the real-time current of the isolation knife and the grounding switch motor and transmitting the current to the microprocessor. And the microprocessor judges whether the real-time current of the isolation knife and the grounding switch motor exceeds a locked rotor fixed value or not, and when the real-time current exceeds the locked rotor fixed value, the microprocessor sends an instruction to close the isolation knife and the grounding switch motor. The microprocessor is of the model STM32F103RBT 6.
The motor hardware protection module converts motor current into a voltage signal, judges whether the motor is overcurrent or not through comparator operation, controls the on-off of the motor through hardware, and feeds a notice back to the microprocessor for controlling the on-off of the motor through the hardware. The motor hardware protection module is combined with motor software protection realized by the motor current acquisition module and the microprocessor to form double protection of the motor. The hardware protection is closer to the limit value of the motor, so that the method is more reliable and safer, and the motor is protected from being damaged to the maximum extent.
The control system also comprises an event recording module which is connected with the microprocessor and used for storing fault records, fault motor current curves, event records, remote operation records and local operation records.
The invention receives a remote operation command through a communication interface, inputs a local operation command through a man-machine interaction module, and obtains a specific operation command, namely a programmed operation command or a single-step operation command after the remote operation command and the local operation command are analyzed and processed by a microprocessor; and the control module drives the corresponding electric operation unit so as to control the on-off of the circuit breaker, the isolating switch and the grounding switch. That is to say, the control system of the invention has the functions of local operation and remote operation, and simultaneously, the local operation and the remote operation are controlled in a programming way, thereby realizing the intellectualization and the automation of the control system and improving the safety and the reliability of the system.
Based on the same inventive concept, the invention also discloses a ring main unit programmed control method, which is realized by adopting the ring main unit control system and specifically comprises the following steps:
step 1, judging whether the ring main unit has an electric five-prevention execution condition, and if so, entering step 2;
step 2, inputting a local operation command group through a human-computer interaction module, or receiving a remote operation command group through a communication interface;
step 3, analyzing and processing the local operation command group or the remote operation command group to obtain a specific operation command, and when the specific operation command is a single-step operation command, directly sending the single-step operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module by the microprocessor to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching on and off operations;
when the specific operation command is a programmed operation command, the microprocessor gradually issues the operation commands contained in the programmed operation command to the circuit breaker control module, the isolation knife control module or the grounding switch control module according to the state obtained by the switch input quantity in sequence, and controls the circuit breaker, the isolation knife or the grounding switch to carry out switching-on and switching-off operations;
collecting the current of the isolation knife and the grounding switch motor in real time in the process of switching on or switching off the isolation knife and the grounding switch, judging whether the current exceeds a locked rotor fixed value, and if so, switching off the motor;
step 4, completing the operation command, and turning off the motor;
and 5, displaying the running state of the control system, and displaying the switching-on and switching-off states of the circuit breaker, the disconnecting switch and the grounding switch.
In step 2, when the microprocessor receives the remote operation command group, storing the remote operation record; when the microprocessor receives the local operation command group, the local operation record is stored. In step 3, storing the switching-on/off signal deflection event records of the circuit breaker, the disconnecting switch and the grounding switch in the operation process according to the operation command; when the motor stops because the current of the motor exceeds the locked-rotor fixed value, the fault record and the current curve of the fault motor are stored, so that the fault can be traced.
In step 3, when the specific operation command analyzed by the microprocessor is a program operation command, and the program operation command includes two or more operation commands operating in sequence, the following operations are performed:
(1) the microprocessor transmits a first operation command in the programmed operation command to the circuit breaker control module, the isolating switch control module or the grounding switch control module to control the switching-on and switching-off operations of the circuit breaker, the isolating switch or the grounding switch;
(2) the switch input quantity module acquires the switching-on and switching-off states of the circuit breaker, the disconnecting switch or the grounding switch controlled by the first operation instruction in real time, stops the first operation instruction when the switching-on and switching-off states are not correct, waits for the microprocessor to send the next operation instruction of the programmed operation instruction to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module, and continues to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching-on and switching-off operations;
(3) and (5) repeating the step (2) until the execution of the programming operation command is finished.
For example, when the programmed operation command analyzed by the processor is in an operation state → maintenance grounding, the microprocessor issues a first operation command 'breaker opening' in the programmed command to the breaker control module to control the breaker to open the breaker. Meanwhile, the switching value input module acquires the state of the circuit breaker. And when the state is the opening state, stopping the output of the circuit breaker control module. The microprocessor issues a second operation command 'isolating knife brake separating' in the programmed command to the isolating knife control module to control the isolating knife to perform brake separating. Meanwhile, the switching value input module acquires the state of the isolation knife. When the state is open, the output of the isolation knife control module is stopped. And the microprocessor transmits a third operation command 'grounding switch closing' in the programmed command to the grounding switch control module to control the grounding switch to be closed. And when the grounding switch is switched on, stopping the output of the grounding switch module, and finishing the execution of the programmed operation command.
The key point of the invention is that the invention has the functions of local operation and remote operation, the local operation can issue a programmed control command and a single-step operation command to the circuit breaker, the disconnecting switch and the grounding switch, and the remote operation can also issue the programmed control command and the single-step operation command to the circuit breaker, the disconnecting switch and the grounding switch, thereby realizing the programmed control of the local operation and the remote operation, realizing the intellectualization and the automation of the ring main unit control system, avoiding a plurality of problems caused by manual operation and improving the safety and the reliability of the system. In addition, the invention obtains the real-time current of the isolation knife and the grounding switch motor through the motor current acquisition module, and switches on and off the motor power supply by judging whether the current exceeds the locked rotor fixed value, thereby protecting the motor from being burnt out, prolonging the service life of the motor and ensuring the normal operation of the system.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement that is within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a looped netowrk cabinet programming control system which characterized in that: the intelligent isolation switch comprises a microprocessor, a communication interface, a human-computer interaction module, a switching value input module, a circuit breaker control module, an isolation knife control module, a grounding switch control module, a motor current sampling module and a motor hardware protection module, wherein the human-computer interaction module, the switching value input module, the communication interface, the circuit breaker control module, the isolation knife control module, the grounding switch control module, the motor current sampling module and the motor hardware protection module are all connected with the microprocessor; wherein,
the communication interface is used for receiving a remote operation command group sent by the upper computer and sending the remote operation command group to the microprocessor;
the human-computer interaction module is used for inputting a local operation command group and sending the local operation command group to the microprocessor; the remote operation command set and the local operation command set comprise a programming operation command and a single-step operation command; the human-computer interaction module is also used for displaying the running state of the control system and the states of the circuit breaker, the disconnecting switch and the grounding switch;
the switching value input module is used for acquiring the states of the circuit breaker, the disconnecting switch and the grounding switch and sending the states to the microprocessor;
the motor current acquisition module is used for acquiring real-time current of the isolation knife and the grounding switch motor and transmitting the current to the microprocessor;
the microprocessor is used for analyzing and processing the remote operation command group and the local operation command group to acquire a specific operation command; when the specific operation command is a single-step operation command, the microprocessor directly issues the single-step operation command to the circuit breaker control module, the isolation switch control module or the grounding switch control module; when the specific operation command is a programmed operation command, the microprocessor gradually issues the operation commands contained in the programmed operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module according to the state obtained by the switch input quantity; the microprocessor is also used for judging whether the real-time current of the isolating knife and the grounding switch motor exceeds a locked-rotor fixed value or not, and when the real-time current exceeds the locked-rotor fixed value, the microprocessor sends an instruction to close the isolating knife and the grounding switch motor;
the circuit breaker control module is used for receiving an operation command issued by the microprocessor and controlling an electric operation unit of the circuit breaker according to the operation command so as to control the circuit breaker to switch on or switch off;
the isolation knife control module is used for receiving an operation command issued by the microprocessor and controlling an electric operation unit of the isolation knife according to the operation command so as to control the isolation knife to switch on or switch off;
the grounding switch control module is used for receiving an operation command sent by the microprocessor and controlling an electric operation unit of the grounding switch according to the operation command so as to control the grounding switch to switch on or switch off;
and the motor hardware protection module is used for controlling the on-off of the motor by hardware and feeding the notification back to the microprocessor.
2. The ring main unit programmed control system according to claim 1, wherein: the control system also comprises an event recording module which is connected with the microprocessor and used for storing fault records, fault motor current curves, event records, remote operation records and local operation records.
3. The ring main unit programmed control system according to claim 1, wherein: the program operation command has twelve groups, which are respectively:
run status → maintenance ground, the command set includes three operation commands that act in sequence: the breaker is opened, the isolation knife is opened and the grounding switch is closed;
maintenance ground → run state, the command set includes three operational commands acting in sequence: the grounding switch is opened, the isolation knife is closed and the breaker is closed;
run state → cold standby state, the command set includes two operational commands that act in sequence: the breaker is opened and the isolation knife is opened;
cold standby → run state, the command set includes two operational commands acting in sequence: closing an isolation knife and a breaker;
hot standby → maintenance ground, the command set includes two operation commands that act in sequence: the isolation knife is opened and the grounding switch is closed;
ground → hot standby status is maintained, the command set includes two operation commands acting in sequence: the grounding switch is opened and the isolation knife is closed;
run state → hot standby state, the command set includes an operation command: opening a breaker;
hot standby → run status, the command set includes an operation command: switching on a breaker;
hot standby → cold standby, the command set includes an operation command: separating the brake by an isolation knife;
cold standby → hot standby, the command set includes an operation command: closing the isolating knife;
cold standby status → maintenance ground, the command set includes an operation command: switching on the grounding switch;
maintenance ground → cold standby state, the set of commands comprising an operation command: the grounding switch is opened.
4. The ring main unit programmed control system according to claim 1, wherein: the single-step operation command comprises six groups of commands which are respectively as follows: the circuit breaker is switched on, the circuit breaker is switched off, the isolation knife is switched on, the isolation knife is switched off, the grounding switch is switched on, and the grounding switch is switched off.
5. The ring main unit programmed control system according to claim 1, wherein: the model of the microprocessor is STM32F103RBT 6.
6. A ring main unit programmed control method is characterized in that: the control method is realized by adopting the ring main unit control system as claimed in claim 1, and comprises the following steps:
step 1, judging whether the ring main unit has an electric five-prevention execution condition, and if so, entering step 2;
step 2, inputting a local operation command group through a human-computer interaction module, or receiving a remote operation command group through a communication interface;
step 3, analyzing and processing the local operation command group or the remote operation command group to obtain a specific operation command, and when the specific operation command is a single-step operation command, directly sending the single-step operation command to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module by the microprocessor to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching on and off operations;
when the specific operation command is a programmed operation command, the microprocessor gradually issues the operation commands contained in the programmed operation command to the circuit breaker control module, the isolation knife control module or the grounding switch control module according to the state obtained by the switch input quantity in sequence, and controls the circuit breaker, the isolation knife or the grounding switch to carry out switching-on and switching-off operations;
collecting the current of the isolation knife and the grounding switch motor in real time in the process of switching on or switching off the isolation knife and the grounding switch, judging whether the current exceeds a locked rotor fixed value, and if so, switching off the motor;
step 4, completing the operation command, and turning off the motor;
and 5, displaying the running state of the control system, and displaying the switching-on and switching-off states of the circuit breaker, the disconnecting switch and the grounding switch.
7. The ring main unit programmed control method according to claim 6, wherein: when the motor stops because the current of the motor exceeds a locked-rotor fixed value, storing the fault record and a fault motor current curve;
when the microprocessor receives the remote operation command group, storing the remote operation record;
when the microprocessor receives the local operation command group, storing the local operation record;
and storing the switching-on/off signal deflection event records of the circuit breaker, the isolating switch and the grounding switch in the operation process according to the operation command.
8. The ring main unit programmed control method according to claim 6, wherein: the program operation command has twelve groups, which are respectively:
run status → maintenance ground, the command set includes three operation commands that act in sequence: the breaker is opened, the isolation knife is opened and the grounding switch is closed;
maintenance ground → run state, the command set includes three operational commands acting in sequence: the grounding switch is opened, the isolation knife is closed and the breaker is closed;
run state → cold standby state, the command set includes two operational commands that act in sequence: the breaker is opened and the isolation knife is opened;
cold standby → run state, the command set includes two operational commands acting in sequence: closing an isolation knife and a breaker;
hot standby → maintenance ground, the command set includes two operation commands that act in sequence: the isolation knife is opened and the grounding switch is closed;
ground → hot standby status is maintained, the command set includes two operation commands acting in sequence: the grounding switch is opened and the isolation knife is closed;
run state → hot standby state, the command set includes an operation command: opening a breaker;
hot standby → run status, the command set includes an operation command: switching on a breaker;
hot standby → cold standby, the command set includes an operation command: separating the brake by an isolation knife;
cold standby → hot standby, the command set includes an operation command: closing the isolating knife;
cold standby status → maintenance ground, the command set includes an operation command: switching on the grounding switch;
maintenance ground → cold standby state, the set of commands comprising an operation command: the grounding switch is opened.
9. The ring main unit programmed control method according to claim 8, wherein: when the specific operation command analyzed by the microprocessor is a program operation command, and the program operation command includes more than two operation commands acting in sequence, the following operations are performed:
(1) the microprocessor transmits a first operation command in the programmed operation command to the circuit breaker control module, the isolating switch control module or the grounding switch control module to control the switching-on and switching-off operations of the circuit breaker, the isolating switch or the grounding switch;
(2) the switch input quantity module acquires the switching-on and switching-off states of the circuit breaker, the disconnecting switch or the grounding switch controlled by the first operation instruction in real time, stops the first operation instruction when the switching-on and switching-off states are not correct, waits for the microprocessor to send the next operation instruction of the programmed operation instruction to the circuit breaker control module, the disconnecting switch control module or the grounding switch control module, and continues to control the circuit breaker, the disconnecting switch or the grounding switch to carry out switching-on and switching-off operations;
(3) and (5) repeating the step (2) until the execution of the programming operation command is finished.
10. The ring main unit programmed control method according to claim 6, wherein: the single-step operation command comprises six groups of commands which are respectively as follows: the circuit breaker is opened, the circuit breaker is closed, the isolation knife is opened, the isolation knife is closed, the grounding switch is opened, and the grounding switch is closed.
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