Automatic grinding tool for electric mechanism of ring net cabinet

Abstract

The application discloses a kind of ring network cabinet electric mechanism automatic running-in tool, including core control unit and power module, core control unit is composed of man-machine interface panel and power drive board, power drive board is composed of power conversion circuit, motor drive circuit, split and combined trip coil drive circuit, remote signaling circuit and 485 communication circuit;Motor drive circuit includes the isolation control loop, H bridge circuit and direct current detection loop connected in sequence, H bridge circuit is composed of half bridge drive chip U21, half bridge drive chip U25, hall sensor U22, MOS tube Q1, MOS tube Q2, MOS tube Q3, MOS tube Q4;Split and combined trip coil drive circuit includes optocoupler U32, MOS tube Q6, energy release diode D32;The application overcomes the existing technical and use inconvenience in the automatic running-in tool of manual operation mechanism or electrical element built by artificial;Can greatly improve the running-in efficiency, and can assist in judging the possible problems of mechanism.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and more particularly to a running-in device for an electric operating mechanism installed inside a ring main unit. More particularly, the present invention relates to an automatic running-in tool for the electric mechanism of a ring main unit, which can flexibly set running-in parameters, monitor and record the mechanism status, and realize manual / automatic separation and connection. Background Art

[0002] A ring main unit (RMU) is a group of electrical transmission and distribution equipment housed within a metal or non-metallic insulated cabinet or assembled as a spaced-apart ring main unit. As the primary device for protecting and isolating ground cable distribution networks, it is widely used in urban power grids for its safe, reliable performance and compact, aesthetically pleasing design. Because the power switching device and rigid busbar are enclosed in a single, enclosed metal casing, which typically serves as insulation and arc extinguishing medium, the switch utilizes a three-phase, three-position load switch or circuit breaker, and its high-performance operating mechanism enables rapid disconnection and operation. During the production and assembly of a RMU, the operating mechanism typically requires multiple run-in procedures. Traditional run-in procedures typically involve manual operation or automated run-in tooling composed of electrical components. Manual operation is time-consuming, labor-intensive, and labor-intensive. Run-in tooling composed of electrical components is bulky, simple in function, and key components are easily damaged, making it difficult to meet production and assembly requirements. Summary of the Invention

[0003] In view of this, in order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an automatic running-in tooling for the electric mechanism of a ring main unit, so as to overcome the technical and usage inconveniences existing in the automatic running-in tooling constructed by existing manual operating mechanisms or electrical components.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] An automatic running-in tool for the electric mechanism of a ring main unit, comprising a core control unit and a power module. The core control unit is composed of a human-machine interface board and a power drive board. The power drive board is composed of a power conversion circuit, a motor drive circuit, a tripping coil drive circuit, a remote signaling circuit, and a 485 communication circuit.

[0006] The motor drive circuit includes an isolation control circuit, an H-bridge circuit and a DC current detection circuit connected in sequence. The H-bridge circuit is composed of a half-bridge driver chip U21, a half-bridge driver chip U25, a Hall sensor U22, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3 and a MOS transistor Q4. The MOS transistors Q1 and Q2 are connected in parallel and are both connected to the half-bridge driver chip U21. The MOS transistors Q3 and Q4 are connected in parallel and are both connected to the half-bridge driver chip U25. The half-bridge driver chip U21 and the half-bridge driver chip U25 are connected. The common enable terminal SD is connected; the DC current detection circuit includes a Hall sensor U22, a capacitor C27, a capacitor C32, a capacitor C30, a resistor R46, a resistor R49 and a diode D18; the isolation control circuit includes three optocouplers U20, U23 and U24, all of which are connected to the MCU, the optocoupler U20 is connected to the half-bridge driver chip U21, the optocoupler U24 is connected to the half-bridge driver chip U25, and the optocoupler U23 is connected to the common enable terminal SD of the two half-bridge driver chips U21 and U25;

[0007] The opening and closing tripping coil drive circuit includes an optocoupler U32, a MOS transistor Q6, and an energy-releasing diode D32. Pin 5 of the optocoupler U32 is grounded, and pins 6 and 7 of the optocoupler U32 are connected. Pin 7 of the optocoupler U32 is connected to the gate G of the MOS transistor Q6 via a resistor R76. A resistor R79 is connected in parallel between the gate G and the source S of the MOS transistor Q6. The source S of the MOS transistor Q6 is grounded, and the drain D of the MOS transistor Q6 is connected to the energy-releasing diode D32.

[0008] Furthermore, the input end of the Hall sensor U22 is connected to the half-bridge driver chip U21, pin 6 of the Hall sensor U22 is grounded through capacitor C32, pin 8 of the Hall sensor U22 is grounded through capacitor C27, pin 7 of the Hall sensor U22 is connected to one end of the diode D18 through resistor R46, and the other end of the diode D18 is output, the resistor R49 is connected to both ends of the diode D18 in parallel with the resistor C30, and the resistor R49 is connected to pin 5 of the Hall sensor U22, and pin 5 of the Hall sensor U22 is grounded.

[0009] Furthermore, the core control unit power supply is divided into two power supply levels: DC24V / DC48V and DC220V / DC110V.

[0010] Furthermore, the human-machine interface board is composed of a liquid crystal display module, a keyboard operation module, an indicator light module and a CPU minimum unit, and the liquid crystal display module, keyboard operation module and indicator light module are all connected to the CPU minimum unit.

[0011] Furthermore, the power conversion circuit is used to convert the power supply into the DC voltage required by each module, which DC voltage includes 12V, 5V, and 3.3V; the motor drive circuit is used for opening and closing the motor or the energy storage motor; the opening and closing tripping coil drive circuit is used to drive the opening and closing release; the remote signaling circuit is used to obtain the opening and closing position of the electric mechanism, whether it is storing energy, and the grounding / isolation status; the 485 communication circuit is used to provide an interface for user remote operation.

[0012] Furthermore, the optocoupler U20, optocoupler U23, and optocoupler U24 are all used to isolate control signals to ensure that the control signals are not affected by the motor control circuit. The optocoupler U20 is used to control the half-bridge driver chip U21, the optocoupler U24 is used to control the half-bridge driver chip U25, and the optocoupler U23 is used to control the common enable terminal SD of the two half-bridge driver chips U21 and the half-bridge driver chip U25.

[0013] Furthermore, the MOS tube Q6 is used to directly drive the opening and closing tripping coil, and its maximum rated current at room temperature is 100A and its drain-source withstand voltage is 80V.

[0014] Furthermore, the energy release diode D32 is used to release the instantaneous high voltage generated when the switch tube is turned off, so as to protect the MOS tube Q6.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides an automatic running-in tool for the electric mechanism of a ring main unit, which has only one core control unit assembled from a circuit board and a housing, and overcomes the technical and operational inconveniences existing in existing automatic running-in tools constructed with manual operating mechanisms or electrical components. Compared with traditional running-in tools constructed with electrical components, the present invention is not only compact and highly intelligent, but also allows for flexible setting of various running-in parameters such as opening and closing interval time, opening and closing timeout time, opening and closing pulse sequence time, reclosing interval time, fault simulation duration, number of running-in times, etc., through liquid crystal and keyboard, and can accurately display and record mechanism abnormalities that occur during the running-in process, which not only greatly improves the running-in efficiency, but also assists in determining possible problems with the mechanism. This is specifically manifested in the following aspects:

[0017] First, the parameters can be flexibly set through the LCD menu of the LCD display module and keyboard operation module, including mechanism type, opening and closing interval, opening and closing output time, opening and closing timeout time, whether to reclose, fault simulation duration, reclosing time, running-in times, and remote signal debounce time;

[0018] Secondly, the running-in task can be started and stopped through the LCD menu, remote signaling and 485 communication;

[0019] Third, it can effectively record abnormalities that occur during the running-in process, making it convenient for users to trace back various events that occurred during the running-in and testing of the mechanism and analyze the causes of abnormalities;

[0020] Fourthly, compared with the running-in tooling built with electrical components, its volume is greatly reduced, and MOSFET is used instead of relays as the basic control element, which greatly improves the life of the tooling itself and makes it more reliable and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a schematic diagram of a motor drive circuit of the present invention;

[0023] Figure 2 It is a schematic diagram of the opening and closing tripping coil driving circuit of the present invention. DETAILED DESCRIPTION

[0024] The following specific examples are given to further clearly, completely and in detail illustrate the technical solution of the present invention. This embodiment is the best embodiment based on the technical solution of the present invention, but the protection scope of the present invention is not limited to the following examples.

[0025] A ring main unit electric mechanism automatic running-in tool, including a core control unit and a power module, the core control unit is composed of a human-machine interface board and a power drive board, the core control unit has a power supply voltage level, DC24V / DC48V compatible and DC220V / DC110V compatible, the core control unit's power supply voltage level and the power module's conversion voltage are selected according to the voltage level of the running-in object; the power drive board is composed of a power conversion circuit, a motor drive circuit, a tripping coil drive circuit, a remote signaling circuit and a 485 communication circuit; wherein the power conversion circuit mainly converts the power supply into the DC voltage required by each module, including 12V, 5V, and 3.3V; the motor drive circuit is used to open and close the motor or the energy storage motor; the tripping coil drive circuit is used to drive the opening and closing release; the remote signaling circuit is used to obtain the opening and closing position of the electric mechanism, whether it is energy storage, and the grounding / isolation status; the 485 communication circuit provides an interface for user remote control;

[0026] The motor drive circuit includes an isolation control circuit, an H-bridge circuit and a DC current detection circuit connected in sequence. The H-bridge circuit is composed of a half-bridge driver chip U21, a half-bridge driver chip U25, a Hall sensor U22, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3 and a MOS transistor Q4. The MOS transistors Q1 and Q2 are connected in parallel and are both connected to the half-bridge driver chip U21. The MOS transistors Q3 and Q4 are connected in parallel and are both connected to the half-bridge driver chip U25. The half-bridge driver chip U21 and the half-bridge driver chip U25 are connected. The common enable terminal SD is connected; the DC current detection circuit includes a Hall sensor U22, a capacitor C27, a capacitor C32, a capacitor C30, a resistor R46, a resistor R49 and a diode D18; the isolation control circuit includes three optocouplers U20, U23 and U24, all of which are connected to the MCU, the optocoupler U20 is connected to the half-bridge driver chip U21, the optocoupler U24 is connected to the half-bridge driver chip U25, and the optocoupler U23 is connected to the common enable terminal SD of the two half-bridge driver chips U21 and U25;

[0027] In this embodiment, the motor drive circuit primarily consists of two half-bridge driver chips, IR2104, four STP100N8F6 MOSFET switches, and an ACS712 Hall effect sensor (U22). Half-bridge driver chips U21 and U25 utilize the IR2104, whose primary function is to control the mutually exclusive opening and closing of the two MOSFETs while also providing MOSFET driving functionality. The two half-bridge driver chips (U21 and U25) and four MOSFETs (Q1, Q2, Q3, and Q4) form the motor-driving H-bridge circuit. Compared to independent MOSFET driver circuits, the IR2104 offers advantages such as hardware dead zones and hardware same-arm conduction protection, ensuring reliable operation of the motor's H-bridge circuit. Furthermore, the Hall effect sensor ACS712 (U22) is used to detect the motor circuit current. The motor current can be used to determine whether the motor is stalled. It, together with capacitor C27, capacitor C32, capacitor C30, resistor R46, resistor R49, and diode 1N4448W (D18), forms a DC current detection circuit.

[0028] The opening and closing tripping coil drive circuit includes an optocoupler U32, a MOS transistor Q6, and an energy-releasing diode D32. Pin 5 of the optocoupler U32 is grounded, and pins 6 and 7 of the optocoupler U32 are connected. Pin 7 of the optocoupler U32 is connected to the gate G of the MOS transistor Q6 via a resistor R76. A resistor R79 is connected in parallel between the gate G and the source S of the MOS transistor Q6. The source S of the MOS transistor Q6 is grounded, and the drain D of the MOS transistor Q6 is connected to the energy-releasing diode D32. Furthermore, in this embodiment, optocoupler U32 utilizes a TLP250 optocoupler, which functions as both an isolation and MOSFET driver. This eliminates the need for multiple discrete components in the MOSFET driver circuit, ensuring better control of component quality. MOSFET Q6 utilizes an STP100N8F6 MOSFET switch, which directly drives the trip coil. The STP100N8F6 is an NMOS transistor manufactured by STMicroelectronics (ST). Its room-temperature rated current can reach 100A, and its drain-source withstand voltage is 80V. MOSFETs are ideal for interrupting low voltages and high currents. Furthermore, energy-releasing diodes D31 and D32 are designed to relieve the transient high voltage generated when the switch is turned off, protecting the MOSFETs.

[0029] Furthermore, the core control unit power supply is divided into two power supply levels: DC24V / DC48V and DC220V / DC110V. The core control unit power supply voltage level and the power module conversion voltage are selected according to the voltage level of the running-in object.

[0030] Furthermore, the human-machine interface board consists of a liquid crystal display module, a keyboard operation module, an indicator light module, and a CPU minimum unit, all of which are connected to the CPU minimum unit. The liquid crystal display module is used to allow users to set parameters, view status, and display historical messages; the keyboard operation module is used to provide parameters to users and provide an input interface for starting and stopping tasks; the indicator light module is used to indicate the current operating status of the tooling, open and close positions, abnormalities, alarm status, etc.; the CPU minimum unit is mainly composed of a single-chip microcomputer and peripheral minimum circuits, and it requires programming to control the orderly operation of each component.

[0031] Furthermore, the minimum CPU unit is composed of several major parts: a running-in sequence module, an LCD menu frame, an environmental parameter reading and writing module, a hardware driver module, an event recording module, a closing and opening time test module, and a Modbus protocol stack. The running-in sequence module mainly operates the opening and closing of the mechanism and the energy storage according to the mechanism type, opening and closing interval time, and opening and closing timeout time set by the user. It is mainly divided into an opening and closing sequence and a reclosing sequence. The LCD menu frame provides a user-friendly interface for setting running-in parameters. The hardware driver module contains the operating methods of each hardware module and provides an interface for application calls. The event recording module records the abnormalities and warnings that occur during each running-in process in the memory inside the control unit, which can be viewed through the LCD, providing users with a basis for backtracking. The closing and opening time test module can test the opening and closing time characteristics of the mechanism for users. The Modbus protocol stack is a relatively common industrial communication protocol that provides a software interface for remote control of the control unit.

[0032] Furthermore, the power module converts the mains power (AC220) into a corresponding interface operating voltage (DC24 / DC48 / DC110 / DC220).

[0033] Furthermore, the power conversion circuit is used to convert the power supply into the DC voltage required by each module, which DC voltage includes 12V, 5V, and 3.3V; the motor drive circuit is used for opening and closing the motor or the energy storage motor; the opening and closing tripping coil drive circuit is used to drive the opening and closing release; the remote signaling circuit is used to obtain the opening and closing position of the electric mechanism, whether it is storing energy, and the grounding / isolation status; the 485 communication circuit is used to provide an interface for user remote operation.

[0034] Furthermore, the input end of the Hall sensor U22 is connected to the half-bridge driver chip U21, pin 6 of the Hall sensor U22 is grounded through capacitor C32, pin 8 of the Hall sensor U22 is grounded through capacitor C27, pin 7 of the Hall sensor U22 is connected to one end of the diode D18 through resistor R46, and the other end of the diode D18 is output, the resistor R49 is connected to both ends of the diode D18 in parallel with the resistor C30, and the resistor R49 is connected to pin 5 of the Hall sensor U22, and pin 5 of the Hall sensor U22 is grounded.

[0035] Furthermore, the optocoupler U20, optocoupler U23, and optocoupler U24 are all used to isolate control signals to ensure that the control signals are not affected by the motor control loop, and the three signals are connected to the MCU; the optocoupler U20 is used to control the half-bridge driver chip U21, the optocoupler U24 is used to control the half-bridge driver chip U25, and the optocoupler U23 is used to control the common enable terminal SD of the two half-bridge driver chips U21 and the half-bridge driver chip U25.

[0036] Furthermore, the energy releasing diode D32 is used to release the instantaneous high voltage generated when the switch tube is turned off, so as to protect the MOS tube Q6. Furthermore, the energy releasing diodes D31 and D32 are mainly used to release the instantaneous high voltage generated when the switch tube is turned off, so as to protect the MOS tube.

[0037] Furthermore, the MOS tube Q6 is used to directly drive the opening and closing tripping coil, and its maximum rated current at room temperature is 100A and its drain-source withstand voltage is 80V.

[0038] Furthermore, the optocoupler U32 uses the optocoupler TLP250, which has the function of isolating and driving MOSFETs, eliminating the need for too many discrete components to build a MOSFET drive circuit, thereby better controlling component quality. The MOSFET Q6 uses the MOSFET switch STP100N8F6, which is used to directly drive the opening and closing tripping coil. The STP100N8F6 is an NMOS transistor produced by STMicroelectronics (ST). Its room-temperature rated current can reach 100A, and its drain-source withstand voltage is 80V. The MOSFET is an ideal component for switching low-voltage and high-current circuit breakers.

[0039] To sum up, the automatic running-in tooling of the electric mechanism of a ring network cabinet of the present invention overcomes the technical and usage inconveniences existing in the existing automatic running-in tooling constructed by manual operation mechanisms or electrical components; compared with the running-in tooling constructed by traditional electrical components, the present invention is not only compact in size and highly intelligent, but also can flexibly set various running-in parameters through liquid crystal and keyboard, such as opening and closing interval time, opening and closing timeout time, opening and closing pulse timing time, reclosing interval time, fault simulation duration, number of running-in times, etc., and can accurately display and record mechanism abnormalities occurring during the running-in process, which can not only greatly improve the running-in efficiency, but also assist in judging possible problems of the mechanism.

[0040] The above shows and describes the main features, basic principles, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention based on actual circumstances without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic running-in tool for the electric mechanism of a ring main unit, characterized by: It includes a core control unit and a power module. The core control unit is composed of a human-machine interface board and a power drive board. The power drive board is composed of a power conversion circuit, a motor drive circuit, a tripping coil drive circuit, a remote signaling circuit and a 485 communication circuit. The motor drive circuit includes an isolation control circuit, an H-bridge circuit and a DC current detection circuit connected in sequence. The H-bridge circuit is composed of a half-bridge driver chip U21, a half-bridge driver chip U25, a Hall sensor U22, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3 and a MOS transistor Q4. The MOS transistors Q1 and Q2 are connected in parallel and are both connected to the half-bridge driver chip U21. The MOS transistors Q3 and Q4 are connected in parallel and are both connected to the half-bridge driver chip U25. The half-bridge driver chip U21 is connected to the half-bridge driver chip U25. The two terminals are connected through a common enable terminal SD; the DC current detection circuit includes the Hall sensor U22, the capacitor C27, the capacitor C32, the capacitor C30, the resistor R46, the resistor R49 and the diode D18; the isolation control circuit includes three optocouplers U20, U23 and U24, all of which are connected to the MCU, the optocoupler U20 is connected to the half-bridge driver chip U21, the optocoupler U24 is connected to the half-bridge driver chip U25, and the optocoupler U23 is connected to the common enable terminal SD of the two half-bridge driver chips U21 and U25; The opening and closing tripping coil driving circuit includes an optocoupler U32, a MOS transistor Q6, and an energy releasing diode D32. Pin 5 of the optocoupler U32 is grounded, and pins 6 and 7 of the optocoupler U32 are connected. Pin 7 of the optocoupler U32 is connected to the gate G of the MOS transistor Q6 via a resistor R76. A resistor R79 is connected in parallel between the gate G and the source S of the MOS transistor Q6. The source S of the MOS transistor Q6 is grounded, and the drain D of the MOS transistor Q6 is connected to the energy releasing diode D32. The input end of the Hall sensor U22 is connected to the half-bridge driver chip U21, pin 6 of the Hall sensor U22 is grounded through capacitor C32, pin 8 of the Hall sensor U22 is grounded through capacitor C27, pin 7 of the Hall sensor U22 is connected to one end of the diode D18 through resistor R46, and the other end of the diode D18 is output, the resistor R49 is connected to both ends of the diode D18 in parallel with the resistor C30, and the resistor R49 is connected to pin 5 of the Hall sensor U22, and pin 5 of the Hall sensor U22 is grounded.

2. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: The core control unit power supply is divided into two power supply levels: DC24V / DC48V or DC220V / DC110V.

3. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: The human-machine interface board is composed of a liquid crystal display module, a keyboard operation module, an indicator light module and a CPU minimum unit. The liquid crystal display module, keyboard operation module and indicator light module are all connected to the CPU minimum unit.

4. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: The power conversion circuit is used to convert the power supply into the DC voltage required by each module, which includes 12V, 5V and 3.3V; the motor drive circuit is used for opening and closing the motor or the energy storage motor; the opening and closing tripping coil drive circuit is used to drive the opening and closing release; the remote signaling circuit is used to obtain the opening and closing position of the electric mechanism, whether it is storing energy, and the grounding / isolation status; the 485 communication circuit is used to provide an interface for user remote operation.

5. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: Optocoupler U20, optocoupler U23 and optocoupler U24 are all used to isolate control signals to ensure that the control signals are not affected by the motor control circuit. The optocoupler U20 is used to control the half-bridge driver chip U21, the optocoupler U24 is used to control the half-bridge driver chip U25, and the optocoupler U23 is used to control the common enable terminal SD of the two half-bridge driver chips U21 and U25.

6. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: The MOS tube Q6 is used to directly drive the opening and closing tripping coil, and its maximum rated current at room temperature is 100A and its drain-source withstand voltage is 80V.

7. The automatic running-in tool for the electric mechanism of a ring main unit according to claim 1, characterized in that: The energy releasing diode D32 is used to release the instantaneous high voltage generated when the switch tube is turned off, so as to protect the MOS tube Q6.

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