CN113381507A - Isolator control system based on real-time condition diagnosis and multiple anti-misoperation - Google Patents
Isolator control system based on real-time condition diagnosis and multiple anti-misoperation Download PDFInfo
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- 230000002159 abnormal effect Effects 0.000 claims description 28
- 230000003993 interaction Effects 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 15
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- 238000009434 installation Methods 0.000 claims description 5
- 238000013021 overheating Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/026—Movable parts and contacts mounted thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention provides a disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation, which comprises: the system comprises an information acquisition unit, a logic diagnosis unit, an anti-misoperation unit and a variable frequency driving unit; the information acquisition unit is used for acquiring the state information of an isolating switch in the motor control circuit, the voltage information of the motor power supply circuit and the current information of the motor during operation in real time; the logic diagnosis unit is used for determining the opening allowable state information and the closing allowable state information of the motor according to the state information of the isolating switch in the motor control circuit and a built-in opening and closing logic rule; the misoperation prevention unit is used for determining the state information of a power supply circuit breaker of the motor power supply circuit; determining whether the opening operation and the closing operation can be executed aiming at the motor or not according to the state information, the opening allowable state information, the closing allowable state information, the voltage information and the current information of the power circuit breaker; and the variable-frequency driving unit is used for controlling the running state of the motor.
Description
Technical Field
The invention relates to the technical field of electric power automation, in particular to an isolating switch control system based on real-time state diagnosis and multiple anti-misoperation.
Background
At present, an isolating switch with a voltage level of 110kV or above generally uses a motor operating mechanism, and realizes switching-on and switching-off operations by controlling an alternating-current power supply of a three-phase asynchronous motor, but an operation loop of an open isolating switch is mainly formed by building and connecting discrete devices such as various relays, contactors, change-over switches and the like, the number of the devices is large, mechanical contacts are multiple, a circuit structure is complex, and the problem that the isolating switch fails to operate due to faults such as aging of the devices, loosening of wiring, poor contact, mechanical jamming and the like in a complex and severe outdoor environment often occurs. The problem of the refusing action of the isolating switch is not exposed at ordinary times and can be found only when specific opening and closing operations are carried out. Because the isolating switch operation loop is formed by overlapping various discrete components, the installation and arrangement space is narrow, the working environment is severe, the operation loops of different manufacturers and different operation mechanisms are different, operation and maintenance personnel are inconvenient to know and remember, meanwhile, the input contact state of the isolating switch control logic rule cannot be visually obtained, the switching-on and switching-off logic rule cannot be pre-judged in real time, the operation success rate is low, once the loop or the components are in fault, the fault needs to be checked by the maintenance personnel temporarily and one by one according to a drawing, the problems of long fault positioning time consumption, high difficulty and the like exist, great inconvenience is caused to the operation and maintenance, the normal operation plan of a power grid is seriously influenced, and great potential safety hazards are caused.
During operation, the disconnecting switch is switched off by mistake and is switched on by mistake during maintenance, although the occurrence probability is low, once the occurrence probability is low, serious power grid, equipment and personal accidents can be caused. At present, a power supply of an isolating switch only depends on two forward and reverse contactors to realize the switching-on and switching-off operations of the isolating switch, and the isolating switch is mistakenly pulled in due to the influences of operation vibration of a circuit breaker, misoperation, cable damage and the like in actual operation, so that the isolating switch is mistakenly operated. In the checking and accepting process of transformer substations such as Ningxia Lily and six-reel mountain, a plurality of disconnecting switches are subjected to mistaken opening and closing events caused by the influence of the vibration of the circuit breaker, and temporary measures for moving the operating system of the disconnecting switch from the GIS equipment body to the ground control cabinet are forcibly taken.
In the switching-on and switching-off process of the isolating switch, because the movement process of a switch contact is lack of accurate control, the phenomena of contact collision and bounce and damage and deformation of a transmission part often occur due to higher speed at the final stage of action in the operation process, and finally common faults such as switching-off rejection, switching-on rejection, insufficient switching-on and switching-off are caused, so that the switch damage or power failure accident is caused.
Therefore, the problem that the state information of the isolating switch cannot be accurately mastered in the prior art, and the faults occur in the closing operation and the opening operation of the motor is solved.
Disclosure of Invention
The embodiment of the invention provides an isolating switch control system based on real-time state diagnosis and multiple anti-misoperation, and aims to solve the problem that faults occur in closing operation and opening operation of a motor due to the fact that state information of an isolating switch cannot be accurately mastered in the prior art.
The isolating switch control system based on real-time state diagnosis and multiple anti-misoperation comprises an information acquisition unit, a logic diagnosis unit, an anti-misoperation unit and a variable frequency driving unit;
the information acquisition unit is used for acquiring the state information of an isolating switch in the motor control circuit, the voltage information of the motor power supply circuit and the current information of the motor during operation in real time; sending the state information of the isolating switch to the logic diagnosis unit; sending the voltage information and the current information to the anti-misoperation unit;
the logic diagnosis unit is used for receiving the state information of the isolating switch in the motor control circuit, which is sent by the information acquisition unit; according to the state information of an isolating switch in the motor control circuit and a built-in opening and closing logic rule, determining opening allowable state information and closing allowable state information of the motor, and sending the opening allowable state information and the closing allowable state information to the anti-misoperation unit;
the misoperation preventing unit is used for determining the state information of a power supply circuit breaker of the motor power supply circuit; determining whether to execute a switching-off operation and a switching-on operation for the motor according to the state information of the power circuit breaker, the switching-off permission state information, the switching-on permission state information, the voltage information and the current information of the motor;
and the variable-frequency driving unit is used for controlling the running state of the motor.
Optionally, the information collecting unit includes:
the voltage transformer is used for acquiring voltage information of the motor power supply circuit;
the Hall sensor is used for collecting current information in the running process of the motor;
and the switching-in module is used for acquiring the state information of the isolating switch in the motor control circuit.
Optionally, the logic diagnosis unit includes:
the switching-on logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit, and determining switching-on allowable state information of the motor according to a built-in switching-on logic rule and the state information of the disconnecting switch in the motor control circuit; sending the closing permission state information to the anti-misoperation unit;
the opening logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit, and determining opening allowable state information of the motor according to a built-in opening logic rule and the state information of the disconnecting switch in the motor control circuit; and sending the opening permission state information to the anti-misoperation unit.
Optionally, the method further includes:
the interface interaction unit is used for receiving and displaying the state information, the voltage information and the current information of the isolating switch, which are sent by the information acquisition unit; receiving and displaying the switching-on permission state and the switching-off permission state sent by the logic diagnosis unit; receiving and displaying result information which is sent by the anti-misoperation unit and used for determining whether the motor can execute switching-off operation and switching-on operation; displaying a control key for controlling the opening and closing operation of the motor and a control key for controlling the isolating switch so as to enable an operator to complete the opening and closing operation of the motor and the control operation of the isolating switch through remote control;
correspondingly, the information acquisition unit is also used for sending the state information of the isolating switch, the voltage information and the current information which are sent by the information acquisition unit to the interface interaction unit;
the logic diagnosis unit is also used for sending the switching-on permission state and the switching-off permission state to the interface interaction unit;
the misoperation preventing unit is further used for sending result information of whether the motor can be subjected to switching-off operation and switching-on operation or not to the interface interaction unit.
Optionally, the logic diagnosis unit is further configured to obtain abnormal state information in the motor operation control circuit according to the built-in opening and closing logic rule and state information of an isolation switch in the motor operation control circuit, and send the abnormal state information to the interface interaction unit, so that the interface interaction unit displays the abnormal state information;
correspondingly, the interface interaction unit is further configured to receive and display the abnormal state information sent by the logic diagnosis unit.
Optionally, the determining, according to the state information of the power circuit breaker and the opening and closing permission state information and the closing permission state information of the motor, whether the opening and closing operation can be performed on the motor includes:
determining whether the power circuit breaker is in a closed state or not according to the state information of the power circuit breaker, and if the power circuit breaker is in the closed state, further judging whether the motor is in an opening allowable state or a closing allowable state;
if the motor is in a brake-off permission state, determining that brake-off operation can be executed for the motor;
and if the motor is in a closing permission state, determining that a closing operation can be executed for the motor.
Optionally, the variable frequency driving unit includes:
the rectification module is used for connecting a three-phase power supply for supplying power to the motor and rectifying the three-phase power supply into a direct-current power supply;
the voltage space vector control module is used for obtaining a PWM (pulse width modulation) waveform of vector control based on space vector pulse width modulation;
and the driving module is used for obtaining the PWM modulation waveform and inverting the rectified direct current into three-phase alternating current for supplying to the motor based on the PWM modulation waveform.
Optionally, the method further includes:
the circuit protection unit is used for obtaining voltage information of the motor power supply circuit and current information in the running process of the motor; and determining whether the motor is in an abnormal operation state or not according to the voltage information and the current information, and controlling the variable frequency driving unit to close the motor if the motor is in the abnormal state.
Optionally, the determining whether the motor is in an abnormal operation state according to the voltage information and the current information includes:
determining whether the motor is in at least one of the following abnormal operation states according to the voltage information and the current information: overvoltage, undervoltage, overheating, three-phase imbalance, locked rotor, short circuit.
Optionally, the information acquisition unit is further configured to obtain temperature and humidity information of the system installation position, and send the temperature and humidity information to the interface interaction unit, so that the interface interaction unit displays the temperature and humidity information of the system installation position.
Compared with the prior art, the method has the following advantages:
the embodiment of the invention provides an isolating switch control system based on real-time state diagnosis and multiple anti-misoperation, which comprises: the system comprises an information acquisition unit, a logic diagnosis unit, an anti-misoperation unit and a variable frequency driving unit; the information acquisition unit is used for acquiring the state information of an isolating switch in a motor control circuit, the voltage information of a motor power supply circuit and the current information of the motor during operation in real time; sending the state information of the isolating switch to the anti-misoperation unit; sending the voltage information and the current information to the anti-misoperation unit; the logic diagnosis unit is used for receiving the state information of the isolating switch in the motor control circuit, which is sent by the information acquisition unit; according to the state information of an isolating switch in the motor control circuit and a built-in opening and closing logic rule, determining opening allowable state information and closing allowable state information of the motor, and sending the opening allowable state information and the closing allowable state information to the anti-misoperation unit; the misoperation preventing unit is used for determining the state information of a power supply circuit breaker of the motor power supply circuit; determining whether to execute opening operation and closing operation aiming at the motor according to the state information of the power circuit breaker, the opening and closing allowable state information and the voltage information and the current information; and the variable-frequency driving unit is used for providing voltage required by the operation of the motor for the motor main loop.
The above-mentioned system that this application provided is through the state information, supply circuit's that combine the information acquisition unit to obtain in real time state information, the current information of motor operation of power circuit breaker to and logic diagnostic unit built-in divide-shut brake logic judges jointly can be directed against the motor carries out the divide-shut brake operation, has realized right the multiple mistake of preventing of motor operation has reduced the risk that the motor maloperation brought by a wide margin, has improved the efficiency to the motor separating and closing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a disconnecting switch control system based on real-time status diagnosis and multiple anti-misoperation according to a preferred embodiment of the invention;
fig. 2 is a circuit diagram of an exemplary application of the lap control logic rules for a substation high voltage isolator relay according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of a disconnector control box according to a preferred embodiment of the invention;
fig. 4 is a schematic diagram of a disconnector control device according to a preferred embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides a isolator control system based on real-time status diagnosis and multiple anti-misoperation, its core lies in, carries out logic rule analysis to the isolator's among the motor control circuit state information, combines simultaneously the on-state information of motor and power circuit breaker's state information, confirms can to whether can to the motor operates.
Please refer to fig. 1, which is a schematic structural diagram of a disconnecting switch control system based on real-time status diagnosis and multiple anti-misoperation provided in the present application.
The isolating switch control system based on real-time state diagnosis and multiple anti-misoperation comprises: the device comprises an information acquisition unit 101, a logic diagnosis unit 102, an anti-misoperation unit 103 and a variable-frequency driving unit 104.
The information acquisition unit 101 is used for acquiring state information of an isolating switch in a motor control circuit, voltage information of a motor power supply circuit and current information of the motor during operation in real time; and sending the state information of the isolating switch to a logic diagnosis unit 102, and sending the voltage information and the current information to an anti-misoperation unit 103.
The control circuit is a circuit capable of realizing an automatic control function, and the state information of the isolating switch in the motor control circuit is the closing state information of the isolating switch.
Specifically, the state information of the isolation switch may be implemented by an open module in the control circuit, and the open module may collect state information of each switch in the control circuit, for example: collecting switching-on and switching-off input conditions of isolating switches such as a limit switch, an auxiliary switch and a change-over switch.
And the voltage transformer is arranged at a power supply of the motor power supply circuit and used for acquiring voltage information of the motor power supply circuit.
And the Hall sensor is arranged in the frequency conversion driving output power supply loop and is used for acquiring current information in the running process of the motor.
The logic diagnosis unit 102 is configured to receive the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit 101; according to the state information of the disconnecting switch in the motor control circuit and a built-in switching-on and switching-off logic rule, the switching-off permission state information and the switching-on permission state information of the motor are determined, and the switching-off permission state information and the switching-on permission state information are sent to the anti-misoperation unit 103.
Specifically, the opening permission state information indicates whether to permit opening operation for the motor, and correspondingly, the closing permission state information indicates whether to permit closing operation for the motor.
The logic diagnosis unit 102 includes:
and the closing logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit 101, determining closing allowable state information of the motor according to the built-in closing logic rule and the state information of the disconnecting switch in the motor control circuit, and sending the closing allowable state information to the anti-misoperation unit 103.
And the switching-off logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit 101, determining switching-off allowable state information of the motor according to a built-in switching-off logic rule and the state information of the disconnecting switch in the motor control circuit, and sending the switching-off allowable state information to the anti-misoperation unit 103.
The misoperation prevention unit 103 is used for determining the state information of a power supply circuit breaker of the motor power supply circuit; and determining that the switching-off operation and the switching-on operation can be executed for the motor according to the state information of the power circuit breaker, the switching-off allowable state information, the switching-on allowable state information, the voltage information and the current information of the motor.
Specifically, the power circuit breaker is a power air switch disposed in a power supply circuit of a motor, before a normal opening and closing operation process is executed, the anti-misoperation unit 103 needs to be controlled to close the power circuit breaker, and then, according to opening allowable state information and closing allowable state of the motor, it is determined that opening operation and closing operation can be executed for the motor. For example: when the power circuit breaker is in the closed state, if the closing permission state information output by the logic diagnosis unit 102 is that the closing operation is permitted to be performed, it is feasible to perform the closing operation for the motor at this time, but if the power circuit breaker is in the open state, it is infeasible to perform the closing operation for the motor.
Further, the anti-misoperation unit 103 further includes: and the electric operating mechanism is arranged at a power supply breaker for supplying power to the motor power supply circuit and is used for remotely controlling the on-off of the power supply breaker.
After the closing operation is performed on the motor, the motor starts to normally operate to meet the requirement of daily work. And after the work is finished, the electric operating mechanism disconnects the power circuit breaker. In a preferred embodiment of the present application, the electrically operated mechanism automatically opens the power circuit breaker if no command to open the power circuit breaker is received within a predetermined time after the completion of the daily work. Typically 20 minutes is set at the predetermined time.
And the variable-frequency driving unit 104 is used for controlling the rotating speed of the motor during operation.
Specifically, the variable frequency driving unit may be a frequency converter, and the frequency converter is a frequency converter that applies a frequency conversion technology and a microelectronic technology, and controls the motor to control other devices through electric power by changing the frequency of the working power supply of the motor.
Variable frequency drive unit 104, comprising: the device comprises a rectification module, a voltage space vector control module and a driving module.
And the rectification module is used for connecting a three-phase power supply for supplying power to the motor and rectifying the three-phase power supply into a direct-current power supply.
And the voltage space vector control module is used for obtaining a PWM (pulse width modulation) waveform controlled by a vector based on space vector pulse width modulation.
And the driving module is used for obtaining the PWM modulation waveform and inverting the rectified direct current to be used for supplying the three-phase alternating current to the motor according to the PWM modulation waveform so as to control the operation of the motor and the rotating speed of the motor in the operation process.
Furthermore, in order to prevent the motor from generating abnormal conditions such as overvoltage, undervoltage, overheating, three-phase imbalance, locked rotor, short circuit and the like during operation. The system further comprises: a circuit protection unit 105.
The circuit protection unit 105 is configured to obtain voltage information of the motor power supply circuit and current information of the motor during operation, determine whether the motor is in an abnormal operation state according to the voltage information and the current information, and control the variable frequency driving unit to turn off the motor if the motor is in the abnormal operation state.
The system further comprises: the interface interaction unit 106 is configured to receive and display the state information, the voltage information, and the current information of the disconnecting switch, which are sent by the information acquisition unit 101; receiving and displaying the switching-on permission state and the switching-off permission state sent by the logic diagnosis unit 102; receiving and displaying result information which is sent by the misoperation preventing unit 103 and determines whether the switching-off operation and the switching-on operation can be executed aiming at the motor;
in addition, the interface interaction unit 106 is further provided with a control button for controlling the opening and closing operations of the motor and a control button for controlling the disconnecting switch of the motor control circuit, so that an operator can complete the opening and closing operations of the motor and the control operation of the disconnecting switch of the control circuit through remote control.
Further, the logic diagnosis unit 102 is further configured to obtain abnormal state information in the motor operation control circuit according to a built-in opening and closing logic rule and state information of a disconnecting switch in the motor operation control circuit, and send the abnormal state information to the interface interaction unit, so that the interface interaction unit displays the abnormal state information. Specifically, the abnormal state information specifically refers to abnormal state information about a disconnector in the motor operation control circuit, such as: abnormal open and closed states of the isolating switch.
To sum up, the disconnecting switch control system based on real-time status diagnosis and multiple anti-misoperation provided in the embodiment of the present application combines the status information of the power circuit breaker, the voltage information of the power supply circuit, the current information of the motor operation, which is acquired by the information acquisition unit in real time, and the switching logic built in the logic diagnosis unit to jointly determine whether to perform the switching operation on the motor, so as to realize multiple anti-misoperation of the motor operation, and simultaneously, displays the status information, the current information, the voltage information, the result information whether to perform the switching operation on the motor and the switching operation on the motor, and the abnormal status information of the disconnecting switch through the interface interaction unit 106 for remotely controlling the switching operation on the motor and the disconnecting switch. The on-off operation and the convenience and intelligence for operating the isolating switch are greatly improved, and the on-line visual operation and maintenance of the motor operation are realized.
In addition, the system of the present application further includes: and the alarm device is used for giving an alarm when abnormal state information occurs or abnormal operation state occurs in the operation process of the motor so as to remind related operators to check the circuit or the system.
In order to facilitate understanding of the working principle of the disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation provided by the present application, the disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation provided by the present application is introduced below with reference to fig. 2, and fig. 2 is a typical application circuit diagram of a lap joint control logic rule of a transformer substation high-voltage disconnecting switch relay.
Referring to fig. 2, in fig. 2, QF1 is a power circuit breaker, a circuit where QF1 is located is a motor power supply circuit, QF1 can be understood as a power switch of the motor, a circuit controlled by the relay KM1 is a motor opening main circuit, and a circuit controlled by the relay KM2 is a motor closing main circuit. KT1 is a thermal relay for the motor provides overload protection.
QF2 is also a power circuit breaker, and is mainly used as a power switch of a motor control circuit, and the circuit where QF2 is located is the motor control circuit. The motor control circuit is an operation circuit formed by connecting an opening button SB1, a closing button SB2, a stop button SB3, a remote control/near control change-over switch SBT2, auxiliary switches Q (A), Q (B), Q (C), a limit switch, an external locking contact, a door control switch SP1 and the like in series.
Wherein, the isolation switches KM1(A), KM1(B) and KM1(C) are separating brake contactors. The relays KM1(a), KM1(B), and KM1(C) are relays corresponding to the disconnecting switches KM1(a), KM1(B), and KM1(C), respectively. The KM1(A), KM1(B) and KM1(C) are located in a switching-off control loop.
The isolation switches KM2(A), KM2(B) and KM2(C) are closing contactors. The relays KM2(a), KM2(B), and KM2(C) are relays corresponding to the disconnecting switches KM2(a), KM2(B), and KM2(C), respectively. The circuit where the KM2(A), the KM2(B) and the KM2(C) are located is a closing control circuit.
When the isolation switches KM1(A), KM1(B) and KM1(C) are in a closing state, the door control switch SP1 is in a closing state, the external locking open of the separating brake is in a closing state, and the separating positions of the normally open auxiliary switches Q (A), Q (B) and Q (C) are in a separating position, the separating logic rule is satisfied, and the separating brake is in a separating allowing state at the moment. If one of the above conditions is not satisfied, it is determined that the state is not allowed.
When the isolation switches KM1(a), KM1(B) and KM1(C) are in the closed position, the gate control switch SP1 is in the closed position, and the closing external lock is closed, the normally closed auxiliary switches q (a), q (B) and q (C) are closed. And the closing logic rule is satisfied, and the circuit is in a closing permission state at the moment. If one of the conditions is not met, the state of the circuit closing is determined to be in a state of not allowing the circuit closing at the moment.
Under the condition that the motor is determined to be in the opening permission state or the closing permission state, whether the power circuit breaker QF1 is in the closing state needs to be determined, and if the power circuit breaker QF1 is in the closing state at this time, it is determined that the corresponding opening operation or closing operation can be performed on the motor.
In a preferred embodiment of the present application, the electric operating mechanism in the anti-misoperation unit 103 is at the unit QF1, as shown in fig. 3, which is a schematic diagram of the disconnector control box provided in the embodiment of the present application;
wherein TM is the electric operating mechanism to remotely control the on and off of the power breaker QF 1.
The isolating switch operation box also comprises an isolating switch control device which is used for controlling the on and off of an isolating switch in the motor control circuit.
Please refer to fig. 4, which is a schematic diagram of a control device of a disconnecting switch according to an embodiment of the present application.
As shown in fig. 4, the state information of each isolator switch in the switching-on/off logic rule is displayed in the isolator switch control device. When the brake-off allowing state is detected, the device can light the brake-off allowing indicator lamp to be green, and the state information of the isolating switch related in the corresponding brake-off logic rule can be lightened. When the device is in the closing permission state, the closing permission indicating lamp is turned on to be green, and the state information of the disconnecting switch related in the corresponding closing logic rule is also turned on. The isolating switch control device can display voltage information, current information and isolating switch state information acquired by the information acquisition unit 101 through the liquid crystal screen, so that the state of the control circuit can be visually displayed to workers. Furthermore, the information can be transmitted to the interface interaction unit through the remote communication module, so that the opening and closing operation of the motor can be completed remotely through remote control.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation is characterized by comprising: the system comprises an information acquisition unit, a logic diagnosis unit, an anti-misoperation unit and a variable frequency driving unit;
the information acquisition unit is used for acquiring the state information of an isolating switch in the motor control circuit, the voltage information of the motor power supply circuit and the current information of the motor during operation in real time; sending the state information of the isolating switch to the logic diagnosis unit; sending the voltage information and the current information to the anti-misoperation unit;
the logic diagnosis unit is used for receiving the state information of the isolating switch in the motor control circuit, which is sent by the information acquisition unit; according to the state information of an isolating switch in the motor control circuit and a built-in opening and closing logic rule, determining opening allowable state information and closing allowable state information of the motor, and sending the opening allowable state information and the closing allowable state information to the anti-misoperation unit;
the misoperation preventing unit is used for determining the state information of a power supply circuit breaker of the motor power supply circuit; determining whether to execute a switching-off operation and a switching-on operation for the motor according to the state information of the power circuit breaker, the switching-off permission state information, the switching-on permission state information, the voltage information and the current information of the motor;
and the variable-frequency driving unit is used for controlling the running state of the motor.
2. The real-time status diagnosis and multiple anti-misoperation disconnecting switch control system according to claim 1, wherein the information acquisition unit comprises:
the voltage transformer is used for acquiring voltage information of the motor power supply circuit;
the Hall sensor is used for collecting current information in the running process of the motor;
and the switching-in module is used for acquiring the state information of the isolating switch in the motor control circuit.
3. The real-time status diagnosis and multiple anti-misoperation disconnecting switch control system according to claim 1, wherein the logic diagnosis unit comprises:
the switching-on logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit, and determining switching-on allowable state information of the motor according to a built-in switching-on logic rule and the state information of the disconnecting switch in the motor control circuit; sending the closing permission state information to the anti-misoperation unit;
the opening logic rule diagnosis module is used for receiving the state information of the disconnecting switch in the motor control circuit, which is sent by the information acquisition unit, and determining opening allowable state information of the motor according to a built-in opening logic rule and the state information of the disconnecting switch in the motor control circuit; and sending the opening permission state information to the anti-misoperation unit.
4. The real-time status diagnosis and multiple anti-misoperation isolator control system according to claim 1, further comprising:
the interface interaction unit is used for receiving and displaying the state information, the voltage information and the current information of the isolating switch, which are sent by the information acquisition unit; receiving and displaying the switching-on permission state and the switching-off permission state sent by the logic diagnosis unit; receiving and displaying result information which is sent by the anti-misoperation unit and used for determining whether the motor can execute switching-off operation and switching-on operation; displaying a control key for controlling the opening and closing operation of the motor and a control key for controlling the isolating switch so as to enable an operator to complete the opening and closing operation of the motor and the control operation of the isolating switch through remote control;
correspondingly, the information acquisition unit is also used for sending the state information of the isolating switch, the voltage information and the current information which are sent by the information acquisition unit to the interface interaction unit;
the logic diagnosis unit is also used for sending the switching-on permission state and the switching-off permission state to the interface interaction unit;
the misoperation preventing unit is further used for sending result information of whether the motor can be subjected to switching-off operation and switching-on operation or not to the interface interaction unit.
5. The disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation operations as claimed in claim 4, wherein the logic diagnosis unit is further configured to obtain abnormal state information in the motor operation control circuit according to the built-in opening and closing logic rule and state information of the disconnecting switch in the motor operation control circuit, and send the abnormal state information to the interface interaction unit, so that the interface interaction unit displays the abnormal state information;
correspondingly, the interface interaction unit is further configured to receive and display the abnormal state information sent by the logic diagnosis unit.
6. The disconnecting switch control system based on real-time status diagnosis and multiple anti-misoperation operations according to claim 1, wherein the determining whether the opening operation and the closing operation can be performed on the motor according to the status information of the power circuit breaker and the opening and closing allowable status information of the motor comprises:
determining whether the power circuit breaker is in a closed state or not according to the state information of the power circuit breaker, and if the power circuit breaker is in the closed state, further judging whether the motor is in an opening allowable state or a closing allowable state;
if the motor is in a brake-off permission state, determining that brake-off operation can be executed for the motor;
and if the motor is in a closing permission state, determining that a closing operation can be executed for the motor.
7. The real-time status diagnosis and multiple anti-misoperation disconnecting switch control system according to claim 1, wherein the variable frequency driving unit comprises:
the rectification module is used for connecting a three-phase power supply for supplying power to the motor and rectifying the three-phase power supply into a direct-current power supply;
the voltage space vector control module is used for obtaining a PWM (pulse width modulation) waveform of vector control based on space vector pulse width modulation;
and the driving module is used for obtaining the PWM modulation waveform and inverting the rectified direct current into three-phase alternating current for supplying to the motor based on the PWM modulation waveform.
8. The real-time status diagnosis and multiple anti-misoperation isolator control system according to claim 1, further comprising:
the circuit protection unit is used for obtaining voltage information of the motor power supply circuit and current information in the running process of the motor; and determining whether the motor is in an abnormal operation state or not according to the voltage information and the current information, and controlling the variable frequency driving unit to close the motor if the motor is in the abnormal state.
9. The real-time status diagnosis and multiple anti-misoperation isolator control system according to claim 8, wherein the determining whether the motor is in an abnormal operation state according to the voltage information and the current information comprises:
determining whether the motor is in at least one of the following abnormal operation states according to the voltage information and the current information: overvoltage, undervoltage, overheating, three-phase imbalance, locked rotor, short circuit.
10. The disconnecting switch control system based on real-time state diagnosis and multiple anti-misoperation operations according to claim 4, wherein the information acquisition unit is further configured to obtain temperature and humidity information of the system installation position, and send the temperature and humidity information to the interface interaction unit, so that the interface interaction unit displays the temperature and humidity information of the system installation position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110486628.7A CN113381507A (en) | 2021-04-30 | 2021-04-30 | Isolator control system based on real-time condition diagnosis and multiple anti-misoperation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110486628.7A CN113381507A (en) | 2021-04-30 | 2021-04-30 | Isolator control system based on real-time condition diagnosis and multiple anti-misoperation |
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Application publication date: 20210910 |