Isolating switch control device with fault monitoring function

Abstract

The invention provides an isolation switch control device with a fault monitoring function, and relates to the technical field of electric power automation, and the device comprises an information collection module which collects the current information in real time during the operation of an opening and closing drive motor, and transmits the current information to a circuit protection module; the circuit protection module performs feature extraction on the current information in a mode of solving a signal waveform envelope line; whether the disconnecting switch has a fault is determined according to the current signal characteristics, and a control instruction is issued to the variable frequency driving module according to a fault result, or a key monitoring prompt is sent to the key monitoring module; the variable frequency driving module controls the operation state of the opening and closing driving motor according to the issued control instruction; and when the key monitoring module receives the key monitoring prompt sent by the circuit protection module, the monitoring frequency of the isolation switch is increased. According to the scheme, the abnormal state of the isolating switch can be monitored in the opening and closing process, so that serious accidents caused by faults of the isolating switch are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power automation, and in particular to an isolating switch control device with a fault monitoring function. Background Art

[0002] At present, disconnectors with voltage levels of 110kV and above generally use motor operating mechanisms to achieve opening and closing operations by controlling the AC power supply of three-phase asynchronous motors. However, the operating circuit of open disconnectors is mainly built and connected by various discrete devices such as relays, contactors, and transfer switches. There are a large number of components, many mechanical contacts, and a complex circuit structure. In complex and harsh outdoor environments, the disconnector often refuses to operate due to faults such as aging of components, loose wiring, poor contact, and mechanical jamming. The many state points of the operation control circuit come from multiple output contacts of the same component. Since the electrical circuit must use a separate contact for each functional circuit, the traditional electrical circuit uses a large number of contacts, resulting in frequent problems.

[0003] The problem of disconnector refusal to operate will not be exposed at ordinary times, and can only be discovered when performing specific opening and closing operations. It can only be handled on site in an emergency, and power cannot be supplied in time, resulting in large economic losses. Since the operating circuit of the disconnector is composed of various discrete components, the installation space is small, the working environment is harsh, and the operating circuits of different manufacturers and different operating mechanisms are also different, it is not easy for operation and maintenance personnel to be familiar with and remember. At the same time, the input contact status of the disconnector control logic rule cannot be obtained intuitively, and the opening and closing logic rules cannot be predicted in real time. Once a circuit or component failure occurs, the maintenance personnel need to temporarily check one by one against the drawings. There are problems such as long fault location time and difficulty, which causes great inconvenience to operation and maintenance, seriously affects the normal operation plan of the power grid, and causes great safety hazards.

[0004] At present, the power supply of the disconnector only relies on the forward and reverse contactors to realize the opening and closing operations of the disconnector. Since it is impossible to accurately grasp the status information of the reliable opening and closing of the disconnector and the allowable logical state of the opening and closing of the disconnector in real time, it leads to the situation that the contactor is mistakenly attracted due to the influence of circuit breaker operation vibration, misoperation, cable damage, etc. in actual operation, causing the disconnector to malfunction; moreover, in practice, the disconnector often has faults such as jamming and inadequate opening and closing, which leads to more serious accidents. Summary of the invention

[0005] In view of this, in order to address the above shortcomings, it is necessary to propose an isolating switch control device with a fault monitoring function to monitor the abnormal state of the isolating switch during the opening and closing process, so as to reduce the occurrence of serious accidents caused by isolating switch failures.

[0006] The present invention provides an isolating switch control device with a fault monitoring function, the device comprising: an information acquisition module, a circuit protection module, a frequency conversion drive module and a key monitoring module; The information acquisition module is used to collect the current information of the opening and closing drive motor when the motor is running in real time, and send the current information to the circuit protection module; The circuit protection module is used to receive the current information and extract features of the current information by obtaining the signal waveform envelope; and determine whether the disconnector is faulty according to the extracted current signal features, and send a control instruction to the variable frequency drive module according to the determined fault result, so that the variable frequency drive module controls the opening and closing drive motor to run or shut down, or sends a key monitoring prompt to the key monitoring module; The variable frequency drive module is used to control the operating state of the opening and closing drive motor according to the control instructions issued by the circuit protection module; The key monitoring module is used to increase the monitoring frequency of the isolation switch when receiving the key monitoring prompt sent by the circuit protection module.

[0007] Preferably, the circuit protection module comprises: a motor fault determination unit, a feature extraction unit, an isolating switch fault determination unit and an instruction issuing unit; The motor fault determination unit is used to determine whether there is a current signal in the received current information; if not, it is determined that there is a fault in the opening and closing drive motor; The feature extraction unit is used to extract the peak value of the current signal and the time when the peak value appears in the current information by obtaining the signal waveform envelope; The isolating switch fault determination unit is used to determine whether the peak value of the current signal is greater than a first preset threshold value; if not, it is determined that the isolating switch is normal; if so, it is determined whether the time when the peak value of the current signal appears is abnormal; if so, it is determined that the isolating switch is seriously stuck; otherwise, it is determined that the isolating switch is slightly stuck; The instruction issuing unit is used to issue a stop operation instruction to the frequency conversion drive module when the motor fault determination unit determines that the opening and closing drive motor has a fault, or the isolating switch fault determination unit determines that the isolating switch is seriously stuck; and to send a key monitoring prompt to the key monitoring module when the isolating switch fault determination unit determines that the isolating switch is slightly stuck.

[0008] Preferably, the variable frequency drive module is used to control the opening and closing drive motor to stop running when receiving the stop running instruction sent by the instruction issuing unit; The key monitoring module is used to increase the current information collection frequency of the information collection module when receiving the key monitoring prompt sent by the instruction issuing unit, so as to increase the fault monitoring frequency of the isolation switch.

[0009] Preferably, the circuit protection module further comprises: a rotation angle monitoring unit; The rotation angle monitoring unit is used to monitor the rotation angle displacement of the rotating shaft when the disconnector is performing the opening and closing operation, and to determine whether the monitored rotation angle displacement is within a preset standard angle displacement range; if not, it is determined that the disconnector has a fault of not opening and closing in place; The instruction issuing unit is used to issue a stop operation instruction to the frequency conversion drive module when the angle monitoring unit determines that there is a transmission mechanism limit switch fault in the isolating switch, so that the frequency conversion drive module controls the opening and closing drive motor to stop operating.

[0010] Preferably, the information acquisition module is also used to collect voltage information of the opening and closing drive motor power supply circuit in real time, and convert the current information and voltage information into digital voltage information and digital current information and then send them to the circuit protection module; The circuit protection module is also used to receive the digital voltage information and the digital current information, and determine whether the opening and closing drive motor is in an abnormal operating state based on the digital voltage information and the digital current information; and when the opening and closing drive motor is in an abnormal operating state, control the frequency conversion drive module to shut down the opening and closing drive motor; wherein the abnormal operating state includes at least one of overvoltage, undervoltage, overheating, three-phase imbalance, stall and short circuit; the circuit protection module is also used to record the abnormal operating state and form a fault recording and accident message to facilitate personnel to quickly locate and handle the fault.

[0011] Preferably, the device further comprises: a logic diagnosis module and an anti-misoperation module; The information acquisition module is used to collect the state information required for reliable opening and closing operation of the disconnector in real time, and convert the state information into digital state information and send it to the logic diagnosis module; and send the digital voltage information and digital current information to the anti-misoperation module; The logic diagnosis module is used to receive the digital state information sent by the information acquisition module, and determine the digital opening and closing permission state information of the drive motor according to the digital state information and the built-in opening and closing logic rules, and send the digital opening and closing permission state information to the anti-misoperation module; The anti-misoperation module is used to determine the switch state information of the motor power supply, and determine whether to perform the opening and closing operation on the opening and closing drive motor according to the switch state information, the digital opening and closing permission state information, the digital voltage information and the digital current information; The variable frequency drive module is also used to generate three-phase alternating current for providing to the opening and closing drive motor through rectification, vector control PWM modulation, and inversion, thereby realizing opening and closing operations.

[0012] Preferably, the logic diagnosis module comprises: a closing logic rule diagnosis unit and an opening logic rule diagnosis unit; The closing logic rule diagnosis unit is used to determine the closing permission state information of the opening and closing drive motor according to the digital state information sent by the information acquisition module and the built-in closing logic rule, and send the closing permission state information to the anti-misoperation module in the form of digital quantity; The opening logic rule diagnosis unit is used to determine the opening permission status information of the opening and closing drive motor according to the digital status information sent by the information acquisition module and the built-in opening logic rule, and send the opening permission status information in digital form to the anti-misoperation module.

[0013] Preferably, the anti-misoperation module is used to determine whether the power supply is in a normal state based on the switch state information and the voltage information of the power supply; if the power supply is in a normal state, it is used to determine whether the opening and closing drive motor is in an opening allowed state or a closing allowed state; if the opening and closing drive motor is in an opening allowed state, it is determined that an opening operation can be performed on the opening and closing drive motor; if the opening and closing drive motor is in a closing allowed state, it is determined that a closing operation can be performed on the opening and closing drive motor.

[0014] Preferably, the variable frequency drive module comprises: a rectifier unit, a voltage space vector control unit and a drive unit; The rectifier unit is connected to a three-phase power supply for supplying power to the opening and closing drive motor, and is used to rectify the three-phase power supply into a DC power supply; The voltage space vector control unit is used to obtain a PWM modulation waveform of vector control based on space vector pulse width modulation; The drive unit is used to obtain the PWM modulation waveform, and based on the PWM modulation waveform, invert the rectified DC power into three-phase AC power for providing to the opening and closing drive motor, so as to control the operation of the opening and closing drive motor and the speed during operation.

[0015] Preferably, the anti-misoperation module further comprises: an electric operating mechanism; The electric operating mechanism is installed at the power switch that supplies power to the motor power supply circuit, and is used to remotely control the on and off of the power switch; and when no instruction to turn off the power switch is received within a preset time, the power switch is controlled to be turned off.

[0016] It can be seen from the above technical scheme that the isolating switch control device with fault monitoring function provided by the present invention includes an information acquisition module, a circuit protection module, a frequency conversion drive module and a key monitoring module. The information acquisition module can collect the current information of the opening and closing drive motor in real time when it is running, and send the current information to the circuit protection module; the circuit protection module can extract the characteristics of the current signal by obtaining the signal waveform envelope, and determine whether the isolating switch has a fault according to the extracted current signal characteristics, and then send corresponding control instructions to the frequency conversion drive module, so that the frequency conversion drive module controls the running state of the opening and closing drive motor according to the control instructions, or sends key monitoring prompts to the key monitoring module, so that the key monitoring module increases the monitoring frequency of the isolating switch. It can be seen that this scheme can analyze the collected current signal through the circuit protection module, and then determine whether the isolating switch has a fault, realize the monitoring of the abnormal state of the isolating switch, and further the frequency conversion drive module and the key monitoring module take corresponding measures according to the monitoring results, reducing the occurrence of serious accidents caused by the failure of the isolating switch. Moreover, since this scheme determines the isolating switch fault based on the current signal when monitoring the isolating switch fault, compared with the traditional scheme of determining by voiceprint signal or vibration signal, the current signal is less affected by the external environment and can more accurately reflect the fault status of the isolating switch, so the accuracy of fault monitoring will be higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an isolating switch control device with a fault monitoring function provided in an embodiment of the present invention.

[0018] Figure 2 A schematic diagram of an information collection module provided in an embodiment of the present invention.

[0019] Figure 3 A schematic diagram of a circuit protection module provided in an embodiment of the present invention.

[0020] Figure 4 A schematic diagram of a variable frequency drive module provided by an embodiment of the present invention.

[0021] Figure 5 It is the application circuit for connecting various relays, contactors and transfer switches in traditional mode.

[0022] Figure 6 A schematic diagram of an isolating switch operating box provided in an embodiment of the present invention.

[0023] Figure 7 A schematic diagram of a panel of an isolating switch control device with a fault monitoring function provided in an embodiment of the present invention.

[0024] In the figure: information acquisition module 10, voltage transformer 11, Hall sensor 12, input unit 13, digital quantity conversion unit 14, circuit protection module 20, motor fault determination unit 21, feature extraction unit 22, disconnector fault determination unit 23, instruction issuing unit 24, angle monitoring unit 25, frequency conversion drive module 30, rectifier unit 31, voltage space vector control unit 32, drive unit 33, key monitoring module 40, logic diagnosis module 50, anti-misoperation module 60, interface interaction module 70. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] like Figure 1-4 As shown, the present invention provides an isolating switch control device with a fault monitoring function, the device comprising: an information acquisition module 10, a circuit protection module 20, a variable frequency drive module 30 and a key monitoring module 40; The information acquisition module 10 is used to collect the current information of the opening and closing drive motor when the motor is running in real time, and send the current information to the circuit protection module 20; The circuit protection module 20 is used to receive the current information and extract features of the current information by obtaining the signal waveform envelope; and determine whether the disconnector is faulty according to the extracted current signal features, and send a control instruction to the variable frequency drive module 30 according to the determined fault result, so that the variable frequency drive module 30 controls the opening and closing drive motor to run or shut down, or sends a key monitoring prompt to the key monitoring module 40; The variable frequency drive module 30 is used to control the operation state of the opening and closing drive motor according to the control instructions issued by the circuit protection module 20; The key monitoring module 40 is used to increase the monitoring frequency of the isolation switch when receiving the key monitoring prompt sent by the circuit protection module 20.

[0027] In this embodiment, the information acquisition module 10 can collect the current information of the opening and closing drive motor in real time, and send the current information to the circuit protection module 20; the circuit protection module 20 can extract the characteristics of the current signal by obtaining the signal waveform envelope, and determine whether the disconnector is faulty according to the extracted current signal characteristics, and then send corresponding control instructions to the variable frequency drive module 30, so that the variable frequency drive module 30 controls the running state of the opening and closing drive motor according to the control instructions, or send key monitoring prompts to the key monitoring module 40, so that the key monitoring module 40 increases the monitoring frequency of the disconnector. It can be seen that this scheme can analyze the collected current signal through the circuit protection module 20, and then determine whether the disconnector is faulty, realize the monitoring of the abnormal state of the disconnector, and further the variable frequency drive module 30 and the key monitoring module 40 take corresponding measures according to the monitoring results, reducing the occurrence of serious accidents caused by disconnector failures. Moreover, since this scheme determines the isolating switch fault based on the current signal when monitoring the isolating switch fault, compared with the traditional scheme of determining by voiceprint signal or vibration signal, the current signal is less affected by the external environment and can more accurately reflect the fault status of the isolating switch, so the accuracy of fault monitoring will be higher.

[0028] For the key monitoring module 40, in one embodiment, when receiving the key monitoring prompt sent by the circuit protection module 20, it can feed back a response signal allowing key monitoring to the circuit protection module 20, so that the circuit protection module 20 can send an instruction to the information collection module 10 to increase the data collection frequency of the information collection module 10. Of course, in another embodiment, the key monitoring module 40 can interact directly with the information collection module 10, so that when receiving the key monitoring prompt sent by the circuit protection module 20, it can directly send an instruction to the information collection module 10, so that the information collection module 10 can increase the data collection frequency.

[0029] The circuit protection module 20 may specifically include: a motor fault determination unit 21, a feature extraction unit 22, an isolating switch fault determination unit 23 and an instruction issuing unit 24; The motor fault determination unit 21 is used to determine whether there is a current signal in the received current information; if not, it is determined that there is a switch-on / off drive motor fault; The feature extraction unit 22 is used to extract the peak value of the current signal and the time when the peak value occurs in the current information by obtaining the signal waveform envelope; The isolating switch fault determination unit 23 is used to determine whether the peak value of the current signal is greater than a first preset threshold value; if not, it is determined that the isolating switch is normal; if so, it is determined whether the time when the peak value of the current signal appears is abnormal; if so, it is determined that the isolating switch is seriously stuck; otherwise, it is determined that the isolating switch is slightly stuck; The instruction issuing unit 24 is used to issue a stop operation instruction to the frequency conversion drive module 30 when the motor fault determination unit 21 determines that the opening and closing drive motor has a fault, or the isolating switch fault determination unit 23 determines that the isolating switch is seriously stuck; and when the isolating switch fault determination unit 23 determines that the isolating switch is slightly stuck, send a key monitoring prompt to the key monitoring module 40.

[0030] In this embodiment, when the feature extraction unit extracts features by obtaining the signal waveform envelope, the peak value of the current signal and the time when the peak value occurs may be extracted based on the Hilbert amplitude demodulation method.

[0031] Of course, in one embodiment, if the isolating switch fault determination unit determines that the peak value of the current signal is not greater than the first preset threshold value, it can further determine whether the time when the peak value of the current signal occurs is abnormal. If the time when the peak value occurs is normal, the isolating switch is normal; if the time when the peak value occurs is abnormal, it means that the rotating shaft of the isolating switch may be loose.

[0032] It is easy to understand that when the isolating switch fault determination unit performs fault determination, it should analyze and determine each extracted current signal peak value and peak moment one by one to ensure that the peak value and peak moment are within the threshold range.

[0033] The variable frequency drive module 30 is used to control the opening and closing drive motor to stop running when receiving the stop running command sent by the command issuing unit 24; The key monitoring module 40 is used to increase the current information collection frequency of the information collection module 10 when receiving the key monitoring prompt sent by the instruction issuing unit 24, so as to increase the fault monitoring frequency of the isolation switch.

[0034] In this embodiment, first, the motor fault determination unit 21 can be used to determine whether there is a current signal in the received current information. If there is no current signal, it means that there is a fault in the opening and closing drive motor or the electric operating mechanism circuit, and the stop operation instruction should be sent to the variable frequency drive module 30. If there is a current signal, the peak value of the current signal and the time when the peak value appears are extracted by means of an envelope. When the isolating switch is operating normally, the peak value of the current signal is relatively constant, and the time when it appears is also relatively constant. Therefore, if the peak value of the current signal is greater than the first preset threshold, it means that the isolating switch is abnormal. At this time, it can be further determined whether the time when the peak value of the current signal appears is abnormal; if yes, it means that the isolating switch is seriously stuck, and the stop operation instruction should be sent to the variable frequency drive module 30, so that the variable frequency drive module 30 controls the opening and closing drive motor to stop running, so as to avoid more serious accidents. If not, it means that the isolating switch is slightly stuck, and a key monitoring prompt can be sent to the key monitoring module 40 at this time, so that the key monitoring module 40 can focus on monitoring the isolating switch by increasing the current information acquisition frequency and other methods, and pay attention to the state of the isolating switch in time.

[0035] In one embodiment, the circuit protection module 20 may further include: a rotation angle monitoring unit 25; The rotation angle monitoring unit 25 is used to monitor the rotation angle displacement of the rotating shaft when the disconnector is performing the opening and closing operation, and determine whether the monitored rotation angle displacement is within the preset standard angle displacement range; if not, it is determined that the disconnector has a fault of opening and closing not being in place; The instruction issuing unit 24 is used to issue a stop operation instruction to the frequency conversion drive module 30 when the angle monitoring unit 25 determines that there is a transmission mechanism limit switch failure in the isolating switch, so that the frequency conversion drive module 30 controls the opening and closing drive motor to stop operating.

[0036] In this embodiment, an angle sensor and a posture sensor can be set on the isolating switch transmission mechanism to monitor the rotational angular displacement of the rotating shaft during the opening and closing operation. If the monitored rotational angular displacement is not within the preset standard angular displacement range, it indicates that the opening and closing is not in place. For example, during the opening and closing operation, the angle of rotation of the rotating shaft exceeds the preset angle, or the angle of rotation does not reach the preset angle, which indicates that the opening and closing is not in place. Moreover, if it is determined by the current signal that the isolating switch is operating normally, and it is determined by the angle monitoring unit 25 that the isolating switch has a fault of opening and closing that is not in place, then it can be further determined that the fault may be that the limit switch of the transmission mechanism is loose.

[0037] In one embodiment, the information acquisition module 10 is also used to collect voltage information of the opening and closing drive motor power supply circuit in real time, and convert the current information and voltage information into digital voltage information and digital current information and send them to the circuit protection module 20; The circuit protection module 20 is also used to receive the digital voltage information and the digital current information, and determine whether the opening and closing drive motor is in an abnormal operating state according to the digital voltage information and the digital current information; and when the opening and closing drive motor is in an abnormal operating state, control the variable frequency drive module 30 to close the opening and closing drive motor; wherein the abnormal operating state includes at least one of overvoltage, undervoltage, overheating, three-phase imbalance, stalling and short circuit; the circuit protection module 20 is also used to record the abnormal operating state, and form a fault recording wave and an accident message, so as to facilitate personnel to quickly locate and deal with the fault. It prevents the occurrence of abnormal conditions such as overvoltage, undervoltage, overheating, three-phase imbalance, stalling, short circuit, etc. during the operation of the drive motor, and records the abnormal operating state, and forms a fault recording wave and an accident message, which can facilitate personnel to quickly locate and deal with the fault.

[0038] In one embodiment, the device may further include: a logic diagnosis module 50 and an anti-misoperation module 60; The information acquisition module 10 is used to collect the state information required for reliable opening and closing operation of the disconnector in real time, and convert the state information into digital state information and send it to the logic diagnosis module 50; and send the digital voltage information and digital current information to the anti-misoperation module 60; The logic diagnosis module 50 is used to receive the digital state information sent by the information acquisition module 10, and determine the digital opening and closing permission state information of the drive motor according to the digital state information and the built-in opening and closing logic rules, and send the digital opening and closing permission state information to the anti-misoperation module 60; The anti-misoperation module 60 is used to determine the switch state information of the motor power supply, and determine whether to perform the opening and closing operation on the opening and closing drive motor according to the switch state information, the digital opening and closing permission state information, the digital voltage information and the digital current information; The variable frequency drive module 30 is also used to generate three-phase alternating current for providing to the opening and closing drive motor through rectification, vector control PWM modulation, and inversion, thereby realizing opening and closing operations.

[0039] In this embodiment, the information acquisition module 10 can collect the state information required for the reliable opening and closing operation of the disconnector in real time, convert it into corresponding digital quantities, replace the numerous homologous state contacts in the traditional control loop with independent digital quantities, realize the reuse of state quantities, and send the digital quantity state information required for the reliable opening and closing operation of the disconnector to the logic diagnosis module 50; at the same time, the information acquisition module 10 also collects the voltage information of the power supply circuit of the opening and closing drive motor and the current information of the motor when it is running in real time, converts it into corresponding digital quantities and sends it to the anti-misoperation module 60; the logic diagnosis module 50 can The status quantity information and the built-in opening and closing logic rules determine the opening permission status information and closing permission status information of the motor, and send them to the anti-misoperation module 60 in the form of digital quantity; the anti-misoperation module 60 can determine the status information of the motor power supply switch, and determine whether the opening operation and closing operation can be performed on the motor according to the power switch status information, the opening permission digital quantity status information of the motor, the closing permission digital quantity status information, the digital quantity voltage information and the digital quantity current information; the frequency conversion drive module 30 can provide the three-phase voltage required for the motor operation to the motor main circuit, and drive the motor to realize the opening and closing operations.

[0040] In this solution, each device can collect relevant information of each component through the information acquisition module 10, and then judge whether the opening and closing operation can be performed based on this, thereby avoiding the problem of opening and closing operation failure. Compared with the traditional method of forming a control loop through connections between components, it can not only determine whether the opening and closing operation is performed on the motor, and realize digital monitoring and real-time logic diagnosis of various state quantities required for reliable opening and closing of the disconnector, thereby solving the problem of failure in the opening and closing operation of the motor, but also determine the location point where the fault occurs, so as to facilitate rapid troubleshooting. In addition, this solution controls the opening and closing drive motor in a variable frequency drive manner, which can eliminate the problem of malfunction of the disconnector caused by malfunction of the contactor.

[0041] The information acquisition module 10 can acquire the state information required for reliable opening and closing of the isolating switch through the input module in the control circuit. The input module can acquire the state information of each switch in the control circuit, for example, it can acquire the input conditions of the opening and closing of the isolating switch such as the limit switch, auxiliary switch, and transfer switch. The control circuit is a circuit that can realize the automatic control function.

[0042] Specifically, the information acquisition module 10 may include a voltage transformer 11, a Hall sensor 12, an input unit 13 and a digital quantity conversion unit 14; The voltage transformer 11 is installed at the power supply of the motor power supply circuit and is used to collect the voltage information of the power supply circuit of the motor driven by the opening and closing of the isolating switch; The Hall sensor 12 is installed in the variable frequency drive output power circuit to collect current information during the operation of the disconnector's opening and closing drive motor; The input unit 13 is used to collect the status information required for reliable opening and closing operation of the disconnector; The digital quantity conversion unit 14 is used to convert the analog voltage information, current information and state information collected by the voltage transformer 11, the Hall sensor 12 and the input unit 13 into corresponding digital quantity information.

[0043] For the logic diagnosis module 50, the digital opening and closing permission state information determined by it may specifically include opening permission state information and closing permission state information. Among them, the opening permission state information refers to whether the opening operation is allowed for the drive motor; correspondingly, the closing permission state information refers to whether the closing operation is allowed for the drive motor.

[0044] In one embodiment, the logic diagnosis module 50 may specifically include: a closing logic rule diagnosis unit and an opening logic rule diagnosis unit; A closing logic rule diagnosis unit, for determining the closing permission state information of the opening and closing drive motor according to the digital state information sent by the information acquisition module 10 and the built-in closing logic rule, and sending the closing permission state information in digital form to the anti-misoperation module 60; The opening logic rule diagnosis unit is used to determine the opening permission status information of the opening and closing drive motor according to the digital status information sent by the information acquisition module 10 and the built-in opening logic rules, and send the opening permission status information in digital form to the anti-misoperation module 60.

[0045] The anti-misoperation module 60 is specifically used to determine whether the power supply is in a normal state according to the switch status information; if the power supply is in a normal state, it is determined whether the opening and closing drive motor is in an opening permitted state or a closing permitted state; if the opening and closing drive motor is in an opening permitted state, it is determined that an opening operation can be performed on the opening and closing drive motor; if the opening and closing drive motor is in a closing permitted state, it is determined that a closing operation can be performed on the opening and closing drive motor.

[0046] In this embodiment, when determining the state information of the power switch of the motor power supply circuit, the power switch refers to the power air switch deployed in the drive motor power supply circuit. Before executing the normal opening and closing operation process, it is necessary to first control the anti-misoperation module 60 to close the power switch, and then determine whether the opening operation and closing operation can be performed on the motor according to the opening permission state information and closing permission state information of the drive motor. For example: when the power switch is in the closed state, the closing permission state information output by the logic diagnosis module 50 is to allow the closing operation to be performed, then it is feasible to perform the closing operation on the motor at this time, but if the power switch is in the separated state, it is not feasible to perform the closing operation on the drive motor.

[0047] In addition, the anti-misoperation module 60 may also include: an electric operating mechanism; the electric operating mechanism is installed at the power switch that supplies power to the motor power supply circuit, and is used to remotely control the on and off of the power switch; and when no instruction to disconnect the power switch is received within a preset time, the power switch is controlled to disconnect.

[0048] In this embodiment, after the closing operation is performed on the drive motor, the motor starts to operate normally to meet the needs of daily work. When the work is completed, the electric operating mechanism disconnects the power switch. If the instruction to disconnect the power switch is not received within a predetermined time after the daily work is completed, the electric operating mechanism automatically disconnects the power switch. Generally, the predetermined time is set in minutes.

[0049] The variable frequency drive module 30 is mainly used to control the direction and speed of the motor when it is running. The variable frequency drive module 30 can be a frequency converter, which uses frequency conversion technology and microelectronic technology to control the motor by changing the working power frequency of the motor, and then controls other devices through electricity. Specifically, the variable frequency drive module 30 may include: a rectifier unit 31, a voltage space vector control unit 32 and a drive unit 33; The rectifier unit 31 is connected to a three-phase power source for supplying power to the opening and closing drive motor, and is used to rectify the three-phase power source into a DC power source; A voltage space vector control unit 32, used to obtain a PWM modulation waveform of vector control based on space vector pulse width modulation; The drive unit 33 is used to obtain a PWM modulation waveform, and based on the PWM modulation waveform, invert the rectified DC power into a three-phase AC power for providing to the opening and closing drive motor, so as to control the operation of the opening and closing drive motor and the speed during operation.

[0050] In addition, in one embodiment, the device provided by the present invention further includes an interface interaction module 70; The information acquisition module 10 is also used to send digital quantity status information, digital quantity voltage information and digital quantity current information to the interface interaction module 70; The logic diagnosis module 50 is also used to send digital opening and closing permission status information to the interface interaction module 70; The anti-misoperation module 60 is further used to send the result information of determining whether to perform the opening and closing operation on the opening and closing drive motor to the interface interaction module 70; The circuit protection module 20 is also used to send the determined fault information to the interface interaction module 70; The key monitoring module 40 is also used to send key monitoring information of the isolating switch to the interface interaction module 70 .

[0051] The interface interaction module 70 is used to receive and display the digital status information, digital voltage information and digital current information sent by the information acquisition module 10; receive and display the digital opening and closing permission status information sent by the logic diagnosis module 50; receive and display the result information sent by the anti-misoperation module 60 for determining whether to perform opening and closing operations on the opening and closing drive motor; and display the control buttons for controlling the opening and closing of the opening and closing drive motor and the control switch for controlling the operation mode of the isolating switch, so that the operator can complete the opening and closing operations of the opening and closing drive motor and the control operations of the isolating switch through remote control.

[0052] In one embodiment, the logic diagnosis module 50 is further used to determine abnormal state information in the motor operation control circuit according to the digital state information and the built-in opening and closing logic rules, and send the abnormal state information to the interface interaction module 70; The interface interaction module 70 is also used to receive and display the abnormal status information sent by the logic diagnosis module 50.

[0053] In this embodiment, the abnormal state information specifically refers to abnormal state information about reliable opening and closing of the isolating switch, such as abnormal opening and abnormal closing of the isolating switch.

[0054] In one embodiment, the information acquisition module 10 is also used to obtain the temperature and humidity information of the device installation location, and send the temperature and humidity information to the interface interaction module 70, so that the interface interaction module 70 can display the temperature and humidity information of the device installation location.

[0055] In summary, the isolating switch control device based on digital state quantity monitoring and logic diagnosis provided by the present application, in combination with the state information of the power switch, the voltage information of the power supply circuit, the current information of the motor operation obtained in real time by the information acquisition module 10, and the opening and closing logic built into the logic diagnosis module 50, jointly determines whether the opening and closing operations can be performed on the motor, thereby realizing the digital monitoring and real-time logic diagnosis of various state quantities required for the reliable opening and closing of the isolating switch, and eliminating the problem of malfunction of the isolating switch caused by malfunction of the contactor by frequency conversion drive. At the same time, the state information, current information, voltage information of the power switch, the result information of whether the opening and closing operations can be performed on the motor, and the abnormal state information of the isolating switch are displayed through the interface interaction module 70 for remote control of the opening and closing operations of the motor and the isolating switch, which greatly improves the processing efficiency of the relevant state confirmation and troubleshooting of the isolating switch, improves the convenience, intelligence and reliability of the opening and closing operations of the isolating switch, and realizes the online visual operation and maintenance of the opening and closing operations of the isolating switch.

[0056] In addition, the device may also include an alarm indication module for giving an alarm when abnormal status information appears or abnormal operation occurs during the operation of the motor, so as to remind relevant operators to check the circuit or system.

[0057] The effect of this solution is further explained by comparing it with the traditional isolation control method. Figure 5 The diagram shows the working principle of traditional isolation control. Figure 6 Shown is a schematic diagram of an isolating switch control box based on this solution. Figure 5 QF1 is the power switch, and the circuit where QF1 is located is the motor power supply circuit. QF1 can be understood as the power switch of the motor. The circuit controlled by relay KM1 is the motor opening main circuit, and the circuit controlled by relay KM2 is the motor closing main circuit. KT1 is a thermal relay used to provide overload protection for the motor.

[0058] QF2 is a power switch, which is mainly used as the power switch of the motor control circuit. The circuit where QF2 is located is the motor control circuit. The motor control circuit is an operating circuit composed of the opening button SB1, the closing button SB2, the stop button SB3, the remote control / local control conversion switch SBT2, the auxiliary switches Q (A), Q (B), Q (C), the limit switch, the external locking contact, the door control switch SP1 and the like connected in series.

[0059] Among them, relays KM1 (A), KM1 (B), and KM1 (C) are opening contactors. Relays KM1 (A), KM1 (B), and KM1 (C) are relays corresponding to disconnectors Q (A), Q (B), and Q (C), respectively. The circuit where KM1 (A), KM1 (B), and KM1 (C) are located is the opening control circuit.

[0060] Relays KM2 (A), KM2 (B), and KM2 (C) are closing contactors. Relays KM2 (A), KM2 (B), and KM2 (C) are relays corresponding to disconnectors Q (A), Q (B), and Q (C), respectively. The circuit in which KM2 (A), KM2 (B), and KM2 (C) are located is a closing control circuit.

[0061] When the disconnector is in the closed position, the normally open auxiliary contacts Q (A), Q (B), Q (C) are in the closed state, the gate switch SP1 is in the closed state, and the external lock input of the opening gate is in the closed position, the opening logic rule is met, and the opening gate is in the allowed state. If one of the above conditions is not met, it is determined that the opening gate is not allowed at this time.

[0062] When the disconnector is in the open position, the normally closed auxiliary contacts Q (A), Q (B), Q (C) are in the closed position, the gate switch SP1 is in the closed position, and the closing external lock is in the closed position, the closing logic rule is met and the state is in the closing permission state. If one of the above conditions is not met, it is determined that the state is in the closing non-permitted state.

[0063] When determining that the motor is in the opening allowed state or the closing allowed state, it is also necessary to determine whether the power circuit breaker QF1 is in the closed state. If the power circuit breaker QF1 is in the closed state at this time, it is determined that the corresponding opening operation or closing operation can be performed on the motor.

[0064] like Figure 6 As shown, the electric operating mechanism of the anti-misoperation module 60 in this solution is set at the power circuit breaker Q1; wherein TM is the electric operating mechanism, which can remotely control the closing and opening of the power circuit breaker Q1. The isolating switch control box also includes an isolating switch control mechanism for controlling the motor, thereby controlling the closing and opening of the isolating switch in the circuit.

[0065] From the control principle of the above-mentioned traditional solution, it can be seen that the traditional solution is built and connected through various discrete devices such as relays, contactors and transfer switches, which contains a large number of components and mechanical contacts, and the circuit structure is complex. In complex and harsh outdoor environments, it is very easy to have faults such as component aging, loose wiring, poor contact and mechanical jamming, which in turn cause the disconnector to refuse to operate and malfunction. In this solution, the integrated disconnector control device can collect relevant information of each component, and realize digital monitoring and real-time logical judgment of various state quantities required for reliable control of the disconnector, and can confirm the relevant status of the disconnector during the opening and closing operation, thereby reducing the occurrence of faults in the opening and closing operation of the motor and ensuring the reliability of the isolation control.

[0066] like Figure 7As shown, each status information in the opening and closing logic rules will be displayed in the isolating switch control device. When the opening is allowed, the device will light up the opening permission indicator light in green, and the status information of the isolating switch involved in the corresponding opening logic rule will also be lit. When the closing is allowed, the device will light up the closing permission indicator light in green, and the status information involved in the corresponding closing logic rule will also be lit. The isolating switch control device will display the voltage information, current information and status information of the isolating switch collected by the information collection module 10 through the LCD screen, so as to intuitively show the status of the control circuit to the staff. Furthermore, the above information can also be transmitted to the interface interaction module 70 through the remote communication module, so as to complete the opening and closing operation of the motor through remote control.

[0067] The present specification also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed in a computer, the computer is caused to execute a method in any one of the embodiments in the specification.

[0068] The present specification also provides a computing device, including a memory and a processor, wherein executable codes are stored in the memory, and when the processor executes the executable codes, a method in any embodiment of the present specification is implemented.

[0069] The modules or units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the present invention, and of course it cannot be used to limit the scope of the rights of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiment are implemented, and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A disconnect switch control device with a fault monitoring function, characterized in that: The device includes: an information collection module, a circuit protection module, a frequency conversion drive module and a key monitoring module; The information acquisition module is used to collect the current information of the opening and closing drive motor when the motor is running in real time, and send the current information to the circuit protection module; The circuit protection module is used to receive the current information and extract features of the current information by obtaining the signal waveform envelope; and determine whether the disconnector is faulty according to the extracted current signal features, and send a control instruction to the variable frequency drive module according to the determined fault result, so that the variable frequency drive module controls the opening and closing drive motor to run or shut down, or sends a key monitoring prompt to the key monitoring module; The variable frequency drive module is used to control the operating state of the opening and closing drive motor according to the control instructions issued by the circuit protection module; The key monitoring module is used to increase the monitoring frequency of the isolation switch when receiving the key monitoring prompt sent by the circuit protection module.

2. The isolating switch control device with fault monitoring function according to claim 1 is characterized in that: The circuit protection module includes: a motor fault determination unit, a feature extraction unit, an isolating switch fault determination unit and an instruction issuing unit; The motor fault determination unit is used to determine whether there is a current signal in the received current information; if not, it is determined that there is a fault in the opening and closing drive motor; The feature extraction unit is used to extract the peak value of the current signal and the time when the peak value appears in the current information by obtaining the signal waveform envelope; The isolating switch fault determination unit is used to determine whether the peak value of the current signal is greater than a first preset threshold value; if not, it is determined that the isolating switch is normal; if so, it is determined whether the time when the peak value of the current signal appears is abnormal; if so, it is determined that the isolating switch is seriously stuck; otherwise, it is determined that the isolating switch is slightly stuck; The instruction issuing unit is used to issue a stop operation instruction to the frequency conversion drive module when the motor fault determination unit determines that the opening and closing drive motor has a fault, or the isolating switch fault determination unit determines that the isolating switch is seriously stuck; and to send a key monitoring prompt to the key monitoring module when the isolating switch fault determination unit determines that the isolating switch is slightly stuck.

3. The isolating switch control device with fault monitoring function according to claim 2, characterized in that: The variable frequency drive module is used to control the opening and closing drive motor to stop running when receiving the stop running command sent by the command issuing unit; The key monitoring module is used to increase the current information collection frequency of the information collection module when receiving the key monitoring prompt sent by the instruction issuing unit, so as to increase the fault monitoring frequency of the isolation switch.

4. The isolating switch control device with fault monitoring function according to claim 2, characterized in that: The circuit protection module further includes: a rotation angle monitoring unit; The rotation angle monitoring unit is used to monitor the rotation angle displacement of the rotating shaft when the disconnector is performing the opening and closing operation, and to determine whether the monitored rotation angle displacement is within a preset standard angle displacement range; if not, it is determined that the disconnector has a fault of not opening and closing in place; The instruction issuing unit is used to issue a stop operation instruction to the frequency conversion drive module when the angle monitoring unit determines that there is a transmission mechanism limit switch fault in the isolating switch, so that the frequency conversion drive module controls the opening and closing drive motor to stop operating.

5. The isolating switch control device with fault monitoring function according to claim 1, characterized in that: The information acquisition module is also used to collect voltage information of the opening and closing drive motor power supply circuit in real time, and convert the current information and voltage information into digital voltage information and digital current information and send them to the circuit protection module; The circuit protection module is further used to receive the digital voltage information and the digital current information, and determine whether the opening and closing drive motor is in an abnormal operating state according to the digital voltage information and the digital current information; And when the opening and closing drive motor is in an abnormal operating state, the frequency conversion drive module is controlled to shut down the opening and closing drive motor; wherein the abnormal operating state includes at least one of overvoltage, undervoltage, overheating, three-phase imbalance, stall and short circuit; the circuit protection module is also used to record the abnormal operating state and form fault recording and accident messages to facilitate personnel to quickly locate and handle the fault.

6. The isolating switch control device with fault monitoring function according to claim 5, characterized in that: The device also includes: a logic diagnosis module and an anti-misoperation module; The information acquisition module is used to collect the state information required for reliable opening and closing operation of the disconnector in real time, and convert the state information into digital state information and send it to the logic diagnosis module; and send the digital voltage information and digital current information to the anti-misoperation module; The logic diagnosis module is used to receive the digital state information sent by the information acquisition module, and determine the digital opening and closing permission state information of the drive motor according to the digital state information and the built-in opening and closing logic rules, and send the digital opening and closing permission state information to the anti-misoperation module; The anti-misoperation module is used to determine the switch state information of the motor power supply, and determine whether to perform the opening and closing operation on the opening and closing drive motor according to the switch state information, the digital opening and closing permission state information, the digital voltage information and the digital current information; The variable frequency drive module is also used to generate three-phase alternating current for providing to the opening and closing drive motor through rectification, vector control PWM modulation, and inversion, thereby realizing opening and closing operations.

7. The isolating switch control device with fault monitoring function according to claim 6, characterized in that: The logic diagnosis module includes: a closing logic rule diagnosis unit and an opening logic rule diagnosis unit; The closing logic rule diagnosis unit is used to determine the closing permission state information of the opening and closing drive motor according to the digital state information sent by the information acquisition module and the built-in closing logic rule, and send the closing permission state information to the anti-misoperation module in the form of digital quantity; The opening logic rule diagnosis unit is used to determine the opening permission status information of the opening and closing drive motor according to the digital status information sent by the information acquisition module and the built-in opening logic rule, and send the opening permission status information in digital form to the anti-misoperation module.

8. The isolating switch control device with fault monitoring function according to claim 7, characterized in that: The anti-misoperation module is used to determine whether the power supply is in a normal state according to the switch state information and the voltage information of the power supply; If the power supply is in a normal state, it is determined whether the opening and closing drive motor is in an opening permission state or a closing permission state; If the opening and closing drive motor is in the opening permission state, determining that the opening operation can be performed on the opening and closing drive motor; If the opening and closing drive motor is in the closing permission state, it is determined that the closing operation can be performed on the opening and closing drive motor.

9. The isolating switch control device with fault monitoring function according to claim 6, characterized in that: The variable frequency drive module includes: a rectifier unit, a voltage space vector control unit and a drive unit; The rectifier unit is connected to a three-phase power supply for supplying power to the opening and closing drive motor, and is used to rectify the three-phase power supply into a DC power supply; The voltage space vector control unit is used to obtain a PWM modulation waveform of vector control based on space vector pulse width modulation; The drive unit is used to obtain the PWM modulation waveform, and based on the PWM modulation waveform, invert the rectified DC power into three-phase AC power for providing to the opening and closing drive motor, so as to control the operation of the opening and closing drive motor and the speed during operation.

10. The isolating switch control device with fault monitoring function according to claim 6, characterized in that: The anti-misoperation module also includes: an electric operating mechanism; The electric operating mechanism is installed at the power switch that supplies power to the motor power supply circuit, and is used to remotely control the on and off of the power switch; and when no instruction to turn off the power switch is received within a preset time, the power switch is controlled to be turned off.

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