An intelligent remote control device for 10kV pole-mounted electric disconnector

Abstract

The application discloses an intelligent remote control device for a 10kV pole-mounted electric disconnecting switch and relates to the technical field of power equipment application of distribution network systems.The 10kV pole-mounted electric disconnecting switch comprises a disconnecting switch body and an electric control box based on the structural design of the disconnecting switch body.An intelligent remote control device is arranged for the electric control box and integrated in the box body.The intelligent remote control device comprises a power supply circuit, a main control chip and a peripheral circuit, a fault signal output port, an operation button, a state indicating lamp, a disconnecting switch state detection port, a motor driving and protection circuit, an electromagnetic clutch control circuit, a radio frequency remote control circuit and a Bluetooth remote control circuit.The opening and closing operations of the disconnecting switch are realized by the radio frequency remote control or the Bluetooth remote control mode, the electric opening and closing and the state monitoring functions of the disconnecting switch under the pole are realized, the reliable operation and stable running of the disconnecting switch are ensured, the pole remote control operation can be realized, and the pole remote control operation can be combined with other control systems.

Description

Technical Field

[0001] This invention relates to the field of power equipment application technology in power distribution network systems, specifically to an intelligent remote control device for a 10kV pole-mounted electric disconnector. Background Technology

[0002] 10kV disconnectors are among the most important electrical equipment in power distribution systems, and are used in vast numbers. However, the vast majority of existing 10kV disconnectors are manually operated, with low levels of automation and intelligence. When disconnecting or closing the switch, operators must manually operate it using an insulated lever. Due to factors such as the high distance of the disconnector from the ground, the complex operating environment, and the skill level of the operators, incomplete opening and closing often occurs, posing significant safety hazards.

[0003] If a traditional external control box is used, containing circuits composed of electrical components such as circuit breakers and contactors, and connected to the control box via cables to achieve pole-mounted operation of the 10kV electric disconnector, several problems still exist. First, the cost is high, on-site construction is complex, and the level of intelligence and digitalization is low. Second, unlike substation equipment, distribution network equipment is widely distributed in a complex environment, making unified management difficult. The pole-mounted control box is susceptible to misoperation by unauthorized personnel or even theft. If a circuit board-based control device is used, it can be integrated and sealed within the control box, but it needs to cope with complex operating conditions such as lightning strikes, surges, fluctuations, and transformer resonance in the power grid. Furthermore, the power supply system of the control device needs to provide DC220V, DC24V, DC12V, DC5V, and DC3.3V voltages, and must properly handle the fluctuations and induced high voltages caused by sudden motor starts and stops. The power supply system must also provide a stable and high-quality power supply voltage to the main control chip during steady-state operation and motor operation. It is necessary to consider the possibility of stopping the motor in case of abnormalities in the motor drive circuit, such as short circuit breakdown of the MOSFET or relay sticking, in order to prevent further safety accidents and equipment damage.

[0004] Patent 202123309980.8, entitled "An Intelligent Electric Control Device for Opening and Closing Disconnect Switches," describes a transmission mechanism and a control box for a disconnect switch. The transmission mechanism is housed within a separate mechanism box, which is separate from the control box. The disconnect switch and mechanism box are mounted on the line, while the control box is installed at the base of the pole. The control box is manually operated by a person, lacking remote control functionality and failing to achieve complete electrical separation between the high-voltage equipment and the operator. The independent control box requires cable and connector connections to the mechanism box, resulting in high costs and risks of theft and unauthorized operation. Unauthorized operation could lead to serious safety incidents and power outages. Furthermore, the control box has a low level of intelligence; operators cannot monitor the switch status, the opening and closing motor current status, or fault diagnosis information in real time. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an intelligent remote control device for a 10kV pole-mounted electric disconnector switch. This device enables the opening and closing of the disconnector switch via radio frequency or Bluetooth remote control, significantly reducing manual labor, simplifying operation, and improving the safety, reliability, and intelligence of the disconnector switch. It also eliminates unreliable factors such as accidental operation by unauthorized personnel.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An intelligent remote control device for a 10kV pole-mounted electric disconnector switch is disclosed. The 10kV pole-mounted electric disconnector switch includes a disconnector switch body and an electric control box designed based on the disconnector switch body structure. The electric control box houses a micro switch assembly, a mechanism shaft, a transmission assembly, and a motor. One end of the mechanism shaft is connected to the motor via the transmission assembly, and the other end is connected to the main shaft of the disconnector switch, driving it to rotate to the open / closed position and the open position. When the mechanism shaft rotates, it touches the micro switch assembly and sends an open / closed position contact signal. An intelligent remote control device is integrated inside the electric control box. The intelligent remote control device includes a power supply circuit, a main control chip and peripheral circuits, a switch input port, a fault signal output port, operation buttons, status indicator lights, a disconnector switch status detection port, a motor drive and protection circuit, an electromagnetic clutch control circuit, a radio frequency remote control circuit, and a Bluetooth remote control circuit.

[0008] The power supply circuit is connected to a voltage transformer to draw power, converting AC 220V voltage into DC 220V, DC 24V, DC 12V, DC 5V, and DC 3.3V voltages, respectively adapting to provide power to each electrical component.

[0009] The main control chip and peripheral circuits are the overall system control, set as a chip integrated circuit board, electrically connected to each component, to realize signal processing, communication, motor drive, motor protection, and logic control functions for opening and closing the gate.

[0010] The digital input port is used to input five-prevention signals, remote control tripping signals, remote control closing signals, stop signals, and remote / local selection signals;

[0011] The fault signal output port is used to output fault alarm signals, closed position signals, open position signals, and empty nodes to the linkage control components.

[0012] The operation buttons are located on the integrated circuit board and are used for production debugging, remote control function testing, and manual opening and closing operations.

[0013] The status indicator light is set on the integrated circuit board to display the real-time status of the electric disconnect switch in the closed position, open position, fault status, and ready status.

[0014] The disconnector switch status detection port is configured as a hardware circuit for detecting the disconnector switch opening and closing status and the five-prevention signal detection, and is connected to the disconnector switch status sensor;

[0015] The motor drive and protection circuit is connected to the motor in the electric control box, drives the motor to operate and detects motor stall abnormalities.

[0016] The electromagnetic clutch control circuit is connected to the electromagnetic clutch of the electric control box, controls the operation of the electromagnetic clutch, and realizes the opening and closing of the disconnecting switch.

[0017] The radio frequency remote control circuit and the radio frequency remote controller realize radio frequency remote control operations of opening, closing, stopping and resetting through radio frequency communication.

[0018] The Bluetooth remote control circuit communicates with the corresponding mobile APP via Bluetooth to remotely control the opening and closing actions and status display of the disconnecting switch.

[0019] The power supply circuit consists of a pre-stage protection circuit, a rectifier circuit, a π-type filter circuit, a power control chip startup and undervoltage protection circuit, a high-frequency transformer peak absorption circuit, a high-frequency transformer, a 12V voltage stabilization and filtering circuit, a chip power supply circuit, a 24V auxiliary circuit, a 12V output voltage feedback and loop compensation circuit, a switching power supply control chip, and peripheral circuits.

[0020] The high-frequency transformer is a flyback high-frequency transformer with dual-current isolated output, which supplies power to the 12V and 24V voltage regulation circuits on the secondary side respectively. The high-frequency transformer spike absorption circuit consists of resistor R19, capacitor C10, diode D6 and transient voltage suppressor Z1.

[0021] The 12V output voltage feedback and loop compensation circuit consists of a power management chip U2, a linear optocoupler P4, a DC gain control resistor R6, a bias current supply resistor R7, an output voltage adjustment resistor R5, an adjustable precision regulator D2, and a loop compensation circuit. The loop compensation circuit is configured as a Type II single-pole single-zero compensation circuit composed of resistors R1 and R2, capacitor C1, and capacitor C2.

[0022] In the chip power supply circuit, the 5V voltage regulator chip and capacitors C12, C13, and C14 form a 5V voltage regulator circuit to power the RF chip, and the 3.3V voltage regulator chip and capacitor C21 form a 3.3V voltage regulator circuit to power the main control chip and the Bluetooth chip.

[0023] The 24V auxiliary circuit consists of diode D8, 24V voltage regulator chip U4, and filter network. The filter network consists of resistor R21, resistor R22, capacitor C15, capacitor C16, capacitor C17, and capacitor C18.

[0024] The motor drive and protection circuit consists of a motor drive MOSFET Q2, a forward control relay K1, a reverse control relay K2, a sampling resistor R92, a freewheeling diode D1, and a braking resistor R91.

[0025] The radio frequency remote control circuit consists of a radio frequency module, an external antenna, and an input port circuit. On the integrated circuit board, the external radio frequency antenna receives remote control signals. The end of the external antenna extends beyond the stainless steel housing of the disconnector mechanism to receive radio frequency remote control signals. The radio frequency remote control is equipped with a trip button, a close button, and a stop button. By pressing the corresponding button, the disconnector switch can be remotely tripped, closed, or stopped.

[0026] The Bluetooth remote control circuit consists of a Bluetooth module, an external antenna, and a communication and control circuit between the Bluetooth module and the main control chip. The Bluetooth module is integrated on an integrated circuit board and interacts with a mobile APP via Bluetooth signal. It communicates with the main control chip via a serial port. The mobile APP functions include a closing button, an opening button, a stop button, a reset button, a closing / opening position display, an action status display, a current magnitude display, and an alarm prompt.

[0027] The beneficial effects of this invention are as follows:

[0028] 1) Based on the 10kV electric disconnect switch and electric control mechanism, a reliable intelligent remote control device is designed, which has multiple operation modes such as remote, radio frequency and Bluetooth remote control. It can be operated remotely from below the pole, or it can be linked with other control systems to realize the remote electric opening and closing and status monitoring functions of the disconnect switch from below the pole, thus ensuring the reliable operation and stable operation of the disconnect switch.

[0029] 2) The power supply system is powered by a PT, which converts the AC 220V voltage into DC 220V, DC 24V, DC 12V, DC 5V and DC 3.3V voltages, respectively to provide power to each electrical component, and can effectively protect and maintain the operation of the power supply system in the event of line lightning strikes, surges, fluctuations, motor starting, etc.

[0030] 3) It has a reliable motor drive circuit that combines the advantages of MOSFETs and relays. It can stably and reliably drive the motor to operate and brake quickly, avoiding the breakdown of MOSFETs and other electronic components by instantaneous induced voltage. It can also brake the motor even in the case of short circuit breakdown of MOSFETs or relay sticking, preventing the fault from escalating further due to the motor's inability to stop.

[0031] 4) It has a high degree of intelligence and good stability, realizes electrical isolation between operators and high-voltage equipment, is easy to operate, greatly improves safety, saves manpower, avoids the disadvantages of manual operation that is easy to fail to open and close the switch due to the switch position being too high, and also avoids safety hazards caused by unauthorized personnel's misoperation.

[0032] 5) It has a compact structure and small size, can be integrated into an electric control box, has low installation cost, and has significant application effect, making it suitable for large-scale application in power distribution network systems. Attached Figure Description

[0033] Figure 1 This is a schematic diagram illustrating the structural principle of the present invention;

[0034] Figure 2 This is a schematic diagram of the circuit connection of the power supply circuit 1 of the present invention;

[0035] Figure 3 This is a schematic diagram of the loop compensation circuit of the present invention;

[0036] Figure 4 This is a schematic diagram of the motor drive circuit of the present invention;

[0037] Figure 5 This is a schematic diagram of the operating timing of the motor drive circuit for the tripping action of the present invention;

[0038] Figure 6 This is a schematic diagram of the operating timing of the motor drive circuit for the closing action of the present invention;

[0039] Figure 7 This is the main program flowchart of the present invention;

[0040] Figure 8 This is a flowchart of the tripping operation of the present invention. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0042] like Figure 1As shown, this is an intelligent remote control device for a 10kV pole-mounted electric disconnect switch. The 10kV pole-mounted electric disconnect switch includes a disconnect switch body and an electric control box designed based on the disconnect switch body structure. The electric control box houses a micro switch assembly, a mechanism shaft, a transmission assembly, and a motor. One end of the mechanism shaft is connected to the motor via the transmission assembly, and the other end of the mechanism shaft is connected to the main shaft of the disconnect switch, driving it to rotate to the open / closed position and the open position. When the mechanism shaft rotates, it touches the micro switch assembly and sends an open / closed position contact signal. An intelligent remote control device is set up for the electric control box and integrated inside the box. The intelligent remote control device includes a power supply circuit 1, a main control chip and peripheral circuits 2, a switch input terminal 3, a fault signal output port 4, operation buttons 5, status indicator lights 6, a disconnect switch status detection port 7, a motor drive and protection circuit 8, an electromagnetic clutch control circuit 9, a radio frequency remote control circuit 10, and a Bluetooth remote control circuit 20.

[0043] like Figure 2 As shown, the power supply circuit 1 is connected to the voltage transformer 21 for power. The 220V AC power obtained from the 10kV line is connected to the power supply circuit 1 after passing through the surge protector. The power supply circuit 1 converts the 220V AC voltage into DC voltages of 220V, 24V, 12V, 5V, and 3.3V, respectively, to provide power to various electrical components. Specifically, DC 5V powers the RF module, DC 3.3V powers the main control chip and Bluetooth module, DC 12V powers the MOSFETs, relays, and drive relays of the electromagnetic clutch in the motor drive circuit, DC 24V powers the input and output relays, and DC 220V powers the motor.

[0044] In a preferred embodiment, the power supply circuit 1 comprises a pre-stage protection circuit 11, a rectifier circuit 12, a π-type filter circuit 13, a power control chip startup and undervoltage protection circuit 14, a high-frequency transformer spike absorption circuit 15, a high-frequency transformer 16, a 12V voltage stabilization and filtering circuit 17, a chip power supply circuit 18, a 24V auxiliary circuit 19, a 12V output voltage feedback and loop compensation circuit 111, and a switching power supply control chip and peripheral circuits 110.

[0045] The pre-stage protection circuit 11 consists of a fuse F1, a varistor RV1, and a safety capacitor C21.

[0046] The rectifier circuit 12 consists of a rectifier stack U1 and a filter circuit. The rectifier stack is a single-phase full-wave rectifier circuit composed of four diodes.

[0047] The π-type filter circuit 13 consists of capacitors C22 and C23 and inductor L1, which can effectively smooth the pulsating DC voltage after rectification and filter out noise.

[0048] The power control chip startup and undervoltage protection circuit 14 consists of a resistor R11 and a power management chip U2.

[0049] Specifically, in this embodiment, the high-frequency transformer 16 is a flyback high-frequency transformer with dual-current isolated output, which supplies power to the 12V and 24V voltage regulation circuits on the secondary side respectively. The high-frequency transformer spike absorption circuit 15 is composed of resistor R19, capacitor C10, diode D6 and transient voltage suppressor Z1.

[0050] Specifically, in this embodiment, the 12V output voltage feedback and loop compensation circuit 111 consists of a power management chip U2, a linear optocoupler P4, a DC gain control resistor R6, a bias current supply resistor R7, an output voltage adjustment resistor R5, an adjustable precision regulator D2, and a loop compensation circuit.

[0051] like Figure 3 As shown, the loop compensation circuit is configured as a Type II single-pole single-zero compensation circuit consisting of resistor R1, resistor R2, capacitor C1, and capacitor C2.

[0052] The 12V output voltage feedback and loop compensation circuit 111 can form a feedback control loop based on the voltage value on the 12V output side, automatically adjusting the switching duty cycle of the MOSFET to achieve a stable 12V DC voltage output. Resistor R7 provides bias current for the adjustable precision regulator D2, ensuring that the TL431 still has a minimum operating current when the linear optocoupler P4 is turned off. Resistor R6 is the control resistor for the DC gain of the feedback loop. The output voltage of the circuit is given by the formula... Confirmed. Among them, I ref The input current at the feedback terminal of the adjustable precision voltage regulator D2 is very small, so the last term in the formula can be ignored. The voltage regulation principle of the circuit is U out ↑→I F ↑→I C ↑→ U C ↓→PWM↓→U out ↓. Among them, I F For the current flowing through the linear optocoupler P4, I C This represents the current at the P4 transistor terminal.

[0053] The loop compensation circuit consists of R1, R2, C1, and C2, forming a Type II single-pole, single-zero compensation circuit. Its circuit diagram is shown below. Figure 3 As shown. The transfer function is:

[0054]

[0055] The DC gain is: The pole angular frequency is:

[0056] From a control strategy perspective, this loop compensation circuit provides a pole at the DC level. After compensation, it optimizes the system's low-frequency characteristics, increases DC gain, and eliminates steady-state error. That is, under normal conditions, the circuit can stabilize the voltage at 12V, eliminating static error and improving control accuracy. A zero is introduced near the lowest pole of the transfer function. This zero cancels out the phase lag caused by the integral element of the compensation network itself, expanding the intermediate frequency bandwidth and improving response speed. In other words, under conditions such as grid fluctuations and sudden motor starts, the power supply system can respond quickly and rapidly stabilize the voltage at 12V. The last pole of the circuit is used to cancel out the zero caused by the ESR resistor, increasing the attenuation of high-frequency components and compensating for the loss of high-frequency interference suppression capability to increase bandwidth. The combination of these three factors results in high voltage control accuracy, good stability, and fast response speed, ensuring stable and reliable power supply even during voltage fluctuations and sudden motor starts.

[0057] Specifically, in this embodiment, in the chip power supply circuit 18, a 5V voltage regulator chip and capacitors C12, C13, and C14 form a 5V voltage regulator circuit to power the RF chip, and a 3.3V voltage regulator chip and capacitor C21 form a 3.3V voltage regulator circuit to power the main control chip and the Bluetooth chip. With the 5V voltage regulator circuit as a foundation, the additional 3.3V voltage regulator circuit achieves multiple voltage regulation effects, greatly improving the reliability of the chip power supply circuit.

[0058] Specifically, in this embodiment, the 24V auxiliary circuit 19 consists of diode D8, 24V voltage regulator chip U4, and a filter network. The filter network consists of resistors R21 and R22, and capacitors C15, C16, C17, and C18. Since the 12V and 24V voltage outputs are completely isolated, in order to obtain another stable 24V voltage output, the output voltage of the other winding of the secondary winding is designed to be higher than 24V. After passing through the filter circuit, it is then regulated by the voltage regulator chip U4 to obtain a 24V DC output.

[0059] The main control chip and peripheral circuit 2 are the system's overall control, configured as a chip integrated circuit board, electrically connected to each component, to realize signal processing, communication, motor drive, motor protection, and logic control functions for opening and closing the gate.

[0060] The digital input port 3 is used to input five-prevention signals, remote control tripping signals, remote control closing signals, stop signals, and remote / local selection signals.

[0061] The fault signal output port 4 is used to output fault alarm signals, closed position signals, open position signals, and empty nodes to the linkage control components.

[0062] The operation buttons 5 are located on the integrated circuit board and are used for production debugging, remote control function testing, and manual opening and closing operations. They include a closing button, a closing button, a stop button, and a reset button, which can control the closing, opening, and stopping of the electric disconnect switch, as well as the fault reset of the intelligent remote control device.

[0063] The status indicator 6 is mounted on the integrated circuit board and is used to display the real-time status of the electric disconnect switch in the closed position, open position, fault state, and ready state.

[0064] The disconnector switch status detection port 7 is configured as a hardware circuit for detecting the disconnector switch opening and closing status and the five-prevention signal detection, and is connected to the disconnector switch status sensor 23.

[0065] The motor drive and protection circuit 8 is connected to the blade motor 24 of the electric control box 22, drives the blade motor 24 to operate and detects motor stall abnormalities.

[0066] As a preferred method, such as Figure 4 As shown, the motor drive and protection circuit 8 in this embodiment consists of a motor drive MOSFET Q2, a forward rotation control relay K1, a reverse rotation control relay K2, a sampling resistor R92, a freewheeling diode D1, and a braking resistor R91.

[0067] This invention addresses the following problems existing in the closing phase of this type of disconnecting switch: fast closing speed requiring rapid motor braking; high-voltage self-induced electromotive force generated at the moment of armature de-energization, easily damaging MOSFETs and other electronic components; relays prone to sticking under high current; and the inability to properly cut off current after MOSFET short-circuit breakdown and relay sticking, leading to the switch failing to stop normally. Therefore, this invention designs a motor drive and protection circuit structure that combines the advantages of both MOSFETs and relays, while also enabling rapid braking, along with corresponding action control timing, as detailed below. Figure 5 and Figure 6 As shown, the details are explained below.

[0068] like Figure 5 As shown, when the disconnector is closed, t c1 During this phase, the remote control device activates the closing relay K1, closing the normally open contact and opening the normally closed contact. This turns on the motor drive MOSFET Q2, at which point the motor closing current i... c1 The current flows from the DC220V+ terminal, through the normally open contact K1, into terminal A of the motor, out through point B, and then back to DC220V- through the normally closed contact K2, MOSFET Q2, and sampling resistor R92. At this time, the motor rotation direction is the closing direction, and the back electromotive force Ea generated by the rotor is positive at terminal A and negative at terminal B.

[0069] When the motor drives the cutter shaft through the reducer to rotate past the center, the spring pushes the shaft to accelerate the closing of the circuit breaker. At this time, the cam mounted on the shaft touches the closing limit switch, triggering a signal change. After receiving the signal change from the closing limit switch, the remote control device, while keeping the closing relay K1 closed, disconnects the motor drive MOSFET Q2. This is t. c2 Phase. T c2 During this phase, the closing relay K1 remains energized, its normally open contact is closed, and its normally closed contact is open. The motor drive MOSFET Q2 is disconnected. At this time, the motor speed is still relatively high, and the generated back electromotive force Ea is still positive at terminal A and negative at terminal B. However, due to the large di / dt, the motor rotor generates a large instantaneous induced electromotive force u to resist current changes, which is negative at terminal A and positive at terminal B, and is much higher than the back electromotive force Ea. Therefore, its combined electromotive force Uc is large, and is negative at terminal A and positive at terminal B. At this time, the instantaneous induced current i c2 The current flows out from terminal B of the motor, sequentially through the normally closed contact of K2, the braking resistor R91, the freewheeling diode D1, and the normally open contact of K1 before returning to terminal A of the motor. The energy of this instantaneous voltage and current is rapidly dissipated in this circuit, effectively preventing high-voltage spikes from damaging the MOSFET and other electronic components.

[0070] After the spike pulse energy is consumed, with the motor drive MOSFET Q2 disconnected, the remote control device controls the closing relay K1 to open, the normally closed contact to close, and the normally open contact to open. This stage is t. c3 At this moment, the instantaneous induced electromotive force u is 0, and the motor still has a certain speed under the spring force. The back electromotive force Ea generated by the motor rotor is still positive at terminal A and negative at terminal B. Current i c3 The current flows out from motor A, passes through normally closed contacts K1 and K2 in sequence, and returns to motor B. The torque generated by this braking current is opposite to the direction of motor rotation when the circuit is closed, thereby achieving rapid braking and preventing the switch from damaging the relevant limit components due to overshoot.

[0071] like Figure 6 As shown, when the disconnector is tripped, t o1 During this phase, the remote control device activates the closing relay K2, closing the normally open contact and opening the normally closed contact. This turns on the motor drive MOSFET Q2, at which point the motor closing current i... o1 The voltage flows from the DC220V+ terminal, through the normally open contact K2, into the motor's B terminal, out through point A, and then back to the DC220V- terminal via the normally closed contact K1, MOSFET Q2, and sampling resistor R92. At this time, the motor's rotation direction is the open direction, and the back electromotive force Ea generated by the rotor is A- and B-.

[0072] When the motor drives the cutter shaft through the reducer to rotate past the center, the spring pushes the shaft to accelerate the opening of the circuit breaker. At this time, the cam mounted on the shaft touches the limit switch at the opening position, triggering a signal change. After receiving the signal change from the limit switch at the opening position, the remote control device, while keeping the opening relay K1 closed, disconnects the motor drive MOSFET Q2. This is t. o2 Stage. t o2 During this phase, the trip relay K2 remains energized, its normally open contact is closed, and its normally closed contact is open. The motor drive MOSFET Q2 is disconnected. At this time, the motor speed is still relatively high, and the generated back electromotive force Ea is still negative at terminal A and negative at terminal B. However, due to the large di / dt, the motor rotor generates a large instantaneous induced electromotive force u to resist current changes, which is positive at terminal A and negative at terminal B, and much higher than the back electromotive force Ea. Therefore, its combined electromotive force Uo is large and is positive at terminal A and negative at terminal B. At this time, the instantaneous induced current i o2 The current flows out from terminal A of the motor, sequentially through the normally closed contact K1, the braking resistor R91, the freewheeling diode D1, and the normally open contact K2 before returning to terminal B of the motor. The energy of this instantaneous voltage and current is rapidly dissipated in this circuit, effectively preventing high-voltage spikes from damaging the MOSFET and other electronic components.

[0073] After the spike pulse energy is consumed, the remote control device, with the motor drive MOSFET Q2 disconnected, controls the trip relay K2 to open, the normally closed contact to close, and the normally open contact to open. This stage is t. o3 At this moment, the instantaneous induced electromotive force u is 0, and the motor still has a certain speed under the spring tension. The back electromotive force Ea generated by the motor rotor is still negative at terminal A and positive at terminal B. Current i o3 The current flows out from terminal B of the motor, passes through normally closed contacts K1 and K2 in sequence, and returns to terminal C of the motor. The torque generated by this braking current is opposite to the direction of the motor's opening rotation, thereby achieving rapid braking and preventing the switch from damaging the relevant limit components due to overshoot.

[0074] The motor drive and protection circuit 8 collects the voltage across the precision sampling resistor R92 via the main control chip, converting it into the current flowing through the sampling resistor, which is the armature current of the permanent magnet DC motor. The magnitude of the armature current is used to determine whether there is mechanical jamming, motor stalling, or other motor malfunctions. When an abnormality is detected, the main control chip executes a motor alarm processing procedure to prevent accidents such as motor burnout or mechanical damage.

[0075] Considering abnormal scenarios, when the motor drive MOSFET Q2 is abnormally short-circuited and breaks down, the remote control device detects the fault based on the current and controls the tripping relay to open. Although MOSFET Q2 is short-circuited and broken down, the motor armature circuit is de-energized due to the disconnection of the relay's main circuit, causing the motor to brake urgently and stop, preventing the motor from failing to stop and thus escalating the fault. Conversely, when the contacts of the motor commutation relays K1 and K2 are stuck together, the remote control device detects the fault based on the current and controls the motor drive MOSFET to open. Although K1 or K2 may not open normally, the motor armature circuit is de-energized due to the disconnection of the motor drive MOSFET Q2, discharging the voltage spike and causing the motor to brake urgently and stop, preventing further breakdown of MOSFET Q2, preventing the motor from failing to stop, and thus escalating the fault.

[0076] The electromagnetic clutch control circuit 9 is connected to the electromagnetic clutch 25 of the electric control box 22, controlling the operation of the electromagnetic clutch 25 and realizing the opening and closing of the disconnecting switch. Specifically, the electromagnetic clutch control circuit 9 consists of a relay and a freewheeling diode. When the disconnecting switch needs to be operated manually, the electromagnetic clutch 25 is not energized, and there is no force between the main shaft of the switch mechanism and the reducer, allowing the operator to easily and effortlessly operate the switch. When the disconnecting switch is electrically operated, the remote control device energizes the electromagnetic clutch 25, the motor rotates, driving the reducer to move, which, through the action of the electromagnetic clutch 25, drives the main shaft of the disconnecting switch to move, thereby completing the opening and closing of the disconnecting switch.

[0077] The radio frequency remote control circuit 10 and the radio frequency remote control 100 realize radio frequency remote control operations of opening, closing, stopping and resetting through radio frequency communication.

[0078] In a preferred embodiment, the radio frequency remote control circuit 10 consists of a radio frequency module, an external antenna, and an input port circuit. The external radio frequency antenna on the integrated circuit board receives remote control signals. The end of the external antenna extends beyond the stainless steel housing of the disconnector mechanism to receive signals from the radio frequency remote control 100. The radio frequency remote control 100 is equipped with a trip button, a close button, and a stop button. By pressing the corresponding button, the disconnector can be remotely tripped, closed, or stopped.

[0079] The Bluetooth remote control circuit 20 communicates with the corresponding mobile APP 200 via Bluetooth to remotely control the opening and closing actions and display the status of the disconnecting switch.

[0080] In a preferred embodiment, the Bluetooth remote control circuit 11 consists of a Bluetooth module, an external antenna, and a communication and control circuit between the Bluetooth module and the main control chip. The Bluetooth module is integrated on an integrated circuit board and interacts with the mobile APP 200 via Bluetooth signals. It communicates with the main control chip via a serial port. The mobile APP 200 includes functions such as a closing button, an opening button, a stop button, a reset button, a closing / opening position display, an action status display, a current magnitude display, and an alarm prompt.

[0081] When the switch needs to be operated, the operator sends relevant commands to the Bluetooth module via the mobile app 200. Upon receiving the commands, the Bluetooth module sends them to the main control chip via serial port. The main control chip then controls the corresponding MOSFETs and relays to drive the motor and complete the opening and closing actions. Simultaneously, the main control chip monitors the switch status in real time and sends relevant information to the Bluetooth module via serial communication. The Bluetooth module then transmits the information wirelessly to the mobile phone, allowing the user to monitor the disconnect switch's status in real time via the mobile app 200.

[0082] like Figure 7 As shown, the main program of this invention includes indicator light subroutines, status detection subroutines, emergency stop subroutines, reset subroutines, serial communication subroutines, local tripping subroutines, local closing subroutines, remote tripping subroutines, remote closing subroutines, remote control tripping subroutines, remote control closing subroutines, and interrupt programs. The main program is responsible for initializing system parameters and input / output interfaces, system control, and subroutine calls. The serial port subroutine handles serial communication between the microcontroller and the Bluetooth module. Each tripping and closing subroutine is responsible for the logic flow of the disconnector switch's tripping and closing actions, including the timing of relay and MOSFET actions, AD sampling control, and motor stall protection procedures.

[0083] like Figure 8 As shown, the local tripping procedure of the present invention is as follows:

[0084] Step S1: The intelligent remote control device detects that the trip button has been pressed;

[0085] Step S2: The intelligent remote control device performs anti-shake filtering on the signal;

[0086] Step S3: After the trip button signal is detected again after filtering, the trip relay is controlled to activate.

[0087] Step S4: After the trip relay is energized, there is a 0.5-second delay before the control MOSFET is turned on. At this time, the motor armature and electromagnetic clutch are energized, the motor drives the reducer to rotate, and then drives the disconnect switch to trip.

[0088] Step S5: After the motor is powered on and delayed, Timer 1 and Timer 2 are triggered. Timer 1 is the tripping action timeout timer, and Timer 2 is the AD sampling timer.

[0089] Step S6: After timer 2 expires, enter the interrupt routine;

[0090] Step S7: Within the interrupt routine, determine that timer 2 has expired, and then start the AD conversion;

[0091] Step S8: After resetting Timer 2, exit the interrupt routine and restore the context;

[0092] Step S9: Check if the AD conversion is complete;

[0093] Step S10: When the AD conversion is complete, store the AD conversion value into an array, increment the array value by 1, and close the AD conversion;

[0094] Step S11: When timer 1 expires, enter the interrupt routine;

[0095] Step S12: Within the interrupt routine, after determining that Timer 2 has expired, increment Timer 1 by 1;

[0096] Step S13: Determine if the count is greater than 40. If it is greater than 40, execute the timeout fault procedure.

[0097] Step S14: After resetting Timer 2, exit the interrupt program and restore the current state; control the motor to stop, and execute the alarm program and indicator light display subroutine, then end.

[0098] Step S15: Check if the number of values ​​in the array is greater than 20;

[0099] Step S16: When the count equals 20, calculate the average current.

[0100] Step S17: Determine whether the average current is greater than the stall threshold;

[0101] Step S18: When the current value is greater than the stall threshold, increment the counter by 1; when the current value is less than the stall threshold, reset the counter to zero.

[0102] Step S19: Determine if the count is greater than 3. If the count is greater than 3, control the motor to stop and execute the alarm procedure.

[0103] Step S20: When the count is less than 3, determine whether the closing position has been reached, i.e. whether the signal of the closing limit switch has been received;

[0104] Step S21: When the disconnector is detected to have reached the open position, execute the motor stop procedure: turn off the MOSFET, after a delay, turn off the open relay, turn off the timer, and clear the counter;

[0105] Step S22: Execute the indicator light display subroutine and end.

[0106] In summary, this invention, based on a 10kV electric disconnector switch, designs a reliable intelligent remote control device to realize remote control and status monitoring of the electric disconnector switch from the pole, thereby achieving effective electrical isolation during opening and closing operations. It ensures the personal safety of operators while enabling stable and reliable opening and closing operations of the disconnector switch, avoiding the risk of misoperation by unauthorized personnel. It has a wide range of applications and significant effectiveness.

[0107] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An intelligent remote control device for a 10kV pole-mounted electric disconnector, wherein the 10kV pole-mounted electric disconnector includes a disconnector body and an electric control box designed based on the structure of the disconnector body. The electric control box houses a micro switch assembly, a mechanism shaft, a transmission assembly, and a motor. One end of the mechanism shaft is connected to the motor via the transmission assembly, and the other end of the mechanism shaft is connected to the main shaft of the disconnector, driving it to rotate to the open / closed position and the open position. When the mechanism shaft rotates, it touches the micro switch assembly and sends an open / closed position contact signal. The device is characterized in that... An intelligent remote control device is provided for the electric control box and integrated inside the box. The intelligent remote control device includes a power supply circuit (1), a main control chip and peripheral circuits (2), a switch input port (3), a fault signal output port (4), operation buttons (5), status indicator lights (6), a disconnect switch status detection port (7), a motor drive and protection circuit (8), an electromagnetic clutch control circuit (9), a radio frequency remote control circuit (10), and a Bluetooth remote control circuit (20), wherein: The power supply circuit (1) is connected to the voltage transformer to draw power and convert the AC 220V voltage into DC 220V, DC 24V, DC 12V, DC 5V and DC 3.3V voltages, respectively to provide power to each electrical component. The main control chip and peripheral circuit (2) are the overall control of the system. They are set as a chip integrated circuit board and electrically connected to each component to realize signal processing, communication, motor drive, motor protection, and opening and closing action logic control functions. The switch input port (3) is used to input five-prevention signals, remote control tripping signals, remote control closing signals, stop signals, and remote / local selection signals; The fault signal output port (4) is used to output fault alarm signal, closed position signal, open position signal, and empty node to the linkage control component; The operation button (5) is set on the integrated circuit board and is used for production debugging, remote control function testing and manual opening and closing operation; The status indicator (6) is set on the integrated circuit board to display the real-time status of the electric disconnect switch in the closed position, in the open position, in fault status, and in the ready state. The disconnector switch status detection port (7) is configured as a hardware circuit for disconnector switch opening and closing status detection and five-proof signal detection, and is connected to the disconnector switch status sensor; The motor drive and protection circuit (8) is connected to the motor of the electric control box, drives the motor to operate and detects motor stall abnormalities; The electromagnetic clutch control circuit (9) is connected to the electromagnetic clutch of the electric control box, controls the operation of the electromagnetic clutch, and realizes the opening and closing of the isolating switch. The radio frequency remote control circuit (10) and the radio frequency remote controller realize radio frequency remote control opening, closing, stopping and resetting operations through radio frequency communication; The Bluetooth remote control circuit (20) communicates with the corresponding mobile APP via Bluetooth to realize the remote control opening and closing action and status display of the disconnect switch.

2. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 1, characterized in that, The power supply circuit (1) consists of a pre-stage protection circuit (11), a rectifier circuit (12), a π-type filter circuit (13), a power control chip start-up and undervoltage protection circuit (14), a high-frequency transformer peak absorption circuit (15), a high-frequency transformer (16), a 12V voltage stabilization filter circuit (17), a chip power supply circuit (18), a 24V auxiliary circuit (19), a 12V output voltage feedback and loop compensation circuit (111), and a switching power supply control chip and peripheral circuits (110).

3. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 2, characterized in that, The high-frequency transformer (16) is a flyback high-frequency transformer with dual-current isolated output, which supplies power to the 12V and 24V voltage regulator circuits on the secondary side respectively. The high-frequency transformer spike absorption circuit (15) consists of resistor R19, capacitor C10, diode D6 and transient voltage suppressor Z1.

4. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 2, characterized in that, The 12V output voltage feedback and loop compensation circuit (111) consists of a power management chip U2, a linear optocoupler P4, a DC gain control resistor R6, a bias current supply resistor R7, an output voltage adjustment resistor R5, an adjustable precision regulator D2, and a loop compensation circuit. The loop compensation circuit is configured as a Type II single-pole single-zero compensation circuit composed of resistors R1 and R2, capacitor C1, and capacitor C2.

5. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 2, characterized in that, In the chip power supply circuit (18), the 5V voltage regulator chip and capacitors C12, C13 and C14 form a 5V voltage regulator circuit to power the RF chip, and the 3.3V voltage regulator chip and capacitor C21 form a 3.3V voltage regulator circuit to power the main control chip and the Bluetooth chip.

6. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 2, characterized in that, The 24V auxiliary circuit (19) consists of diode D8, 24V voltage regulator chip U4 and filter network. The filter network consists of resistor R21, resistor R22, capacitor C15, capacitor C16, capacitor C17 and capacitor C18.

7. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 2, characterized in that, The motor drive and protection circuit (9) consists of a motor drive MOSFET Q2, a forward control relay K1, a reverse control relay K2, a sampling resistor R92, a freewheeling diode D1, and a braking resistor R91.

8. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 1, characterized in that, The radio frequency remote control circuit (10) consists of a radio frequency module, an external antenna, and an input port circuit. The radio frequency module is integrated on the circuit board and receives remote control signals through the external radio frequency antenna. The end of the external antenna extends out of the stainless steel housing of the isolation mechanism to receive radio frequency remote control signals. The radio frequency remote control is equipped with a trip button, a close button, and a stop button. By pressing the corresponding button, the remote control tripping, closing, and stopping of the isolating switch can be achieved.

9. The intelligent remote control device for a 10kV pole-mounted electric disconnector according to claim 1, characterized in that, The Bluetooth remote control circuit (20) consists of a Bluetooth module, an external antenna, and a communication and control circuit between the Bluetooth module and the main control chip. The Bluetooth module is integrated on the integrated circuit board and interacts with the mobile phone APP via Bluetooth signal. It communicates with the main control chip via serial port. The functions of the mobile phone APP include closing button, opening button, stop button, reset button, opening / closing position display, action status display, current magnitude display, and alarm prompt.

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