Full-digital monitoring and control device of power switch cabinet

Abstract

The invention relates to a full-digital monitoring and control device of a power switch cabinet. The invention aims to solve the problems that a microcomputer line protection measurement and control device does not serve as a core to construct a whole-cabinet digital monitoring and intelligent control system of the switch cabinet, and the bus technology on the existing switch cabinet is only limited to solve information transmission on a certain aspect and the like. According to the technical scheme, the system comprises a microcomputer line protection measurement and control device with two CAN-BUS interfaces, a digital terminal main control circuit, a digital circuit breaker control circuit, a digital terminal auxiliary control circuit, an interactive digital display screen, a first CAN bus circuit, a second CAN bus circuit, a first power supply circuit and a second power supply circuit, the first CAN bus circuit is connected among the microcomputer line protection measurement and control device, the digital terminal main control circuit and the digital circuit breaker control circuit, and the second CAN bus circuit is connected among the microcomputer line protection measurement and control device, the digital terminal auxiliary control circuit and the interactive digital display screen through a second bus. A plurality of I / O interfaces are arranged on the main control microcontroller, the auxiliary control microcontroller or the disconnection control microcontroller to be connected with all execution circuits.

Description

Technical Field

[0001] The present invention relates to an intelligent monitoring and control system in a switch cabinet of an electric power device, in particular to a fully digital monitoring and control device for a power switch cabinet. Background Art

[0002] Switchgear is a type of electrical equipment used for switching, controlling, and protecting power systems during power generation, transmission, distribution, and conversion. With increasing safety requirements and the need for automated, intelligent monitoring in power supply systems, the latest generation of switchgear is now equipped with numerous digital monitoring and intelligent control devices. The information transmission of these devices has become a highly complex system, and ensuring the reliable and stable operation of this complex system has become a new challenge for the industry.

[0003] Currently, most automated monitoring and control systems for power switchgear have too many internal wiring, resulting in low communication efficiency, weak anti-interference capabilities, and poor scalability, making it difficult to meet the new requirements of modern power systems for digitalization, intelligence, and high reliability. Bus technology has been used to simplify internal wiring and improve communication efficiency and speed, but each bus only addresses one aspect of information transmission. Due to bus limitations, information transmission cannot be achieved across the entire cabinet's digital monitoring and intelligent control devices. Consequently, no ideal fully digital monitoring and control device for power switchgear is currently available to the industry.

[0004] Industry regulators are advocating the use of microcomputer-based line protection, measurement, and control devices as the processing core for automatic monitoring and control systems within power equipment switchgear, creating a new industry requirement. These devices are a recently available, off-the-shelf product. They include a built-in protection library of over twenty standard protection programs, powerful and comprehensive acquisition capabilities for analog and digital data from primary equipment voltages and currents, self-adaptive operating circuits, and communication ports compatible with standard RS485 and / or industrial CAN buses. These various functions, when properly configured, enable bay-level protection and measurement and control, making them suitable for line protection at voltage levels below 110 kV. However, there is no existing precedent for utilizing microcomputer-based line protection, measurement, and control devices as the processing core of switchgear to construct a fully digital monitoring and intelligent control system for power switchgear. Summary of the Invention

[0005] In order to overcome the fact that there is no precedent in the existing technology for using a microcomputer line protection and measurement and control device as the data processing core to construct a full-cabinet digital monitoring and intelligent control system for a power switch cabinet, and the current use of bus technology in power switch cabinets to simplify the wiring within the cabinet and improve communication efficiency and communication speed is limited to solving certain aspects of information transmission problems, the purpose of the present invention is to provide an improved full-digital monitoring and control device for a power switch cabinet that can overcome the shortcomings of the existing technology.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a fully digital monitoring and control device for a power switch cabinet, characterized in that it includes a microcomputer line protection measurement and control device with two or more CAN-BUS interfaces, a digital terminal main control circuit, a digital circuit breaker control circuit, a digital terminal auxiliary control circuit, an interactive digital display screen, a first CAN bus circuit, a second CAN bus circuit, a first power supply circuit and a second power supply circuit; wherein the first CAN bus circuit is composed of a first bus, a first CAN communication interface circuit on a first parallel end of one end of the first bus, and a second CAN communication interface circuit on a second parallel end of one end of the first bus. Circuit composition; the second CAN bus circuit is composed of a second bus, a third CAN communication interface circuit of a first parallel end at one end of the second bus, and a second parallel end at one end of the second bus; the digital terminal main control circuit includes a main control microcontroller, the digital circuit breaker control circuit includes a break control microcontroller, the digital terminal auxiliary control circuit includes an auxiliary control microcontroller, the main control microcontroller, the break control microcontroller and the auxiliary control microcontroller all adopt STM32F series and alternative series microcontroller chips; the other end of the first bus is connected to the first CAN-BUS interface of the microcomputer line protection measurement and control device, and the first CA The N communication interface circuit is connected to the CAN communication terminal of the main control microcontroller, and the second CAN communication interface circuit is connected to the CAN communication terminal of the interruption control microcontroller; the other end of the second bus is connected to the second CAN-BUS interface of the microcomputer line protection measurement and control device, and the third CAN communication interface circuit is connected to the CAN communication terminal of the auxiliary control microcontroller. The second parallel end of one end of the second bus is connected to the third CAN-BUS interface of the interactive digital display screen; the main control microcontroller has several I / O interfaces for respectively connecting to each main control execution circuit on the power switch cabinet, and the auxiliary control microcontroller has several I / O interfaces. The ports are used to respectively connect to the various auxiliary control execution circuits on the power switch cabinet, and the circuit breaker control microcontroller has several I / O interfaces for respectively connecting to the various circuit breaker execution circuits on the power switch cabinet; the output end of the first power supply circuit is respectively connected to the power supply ends of the digital terminal main control circuit, the digital terminal auxiliary control circuit, the first CAN communication interface circuit and the second CAN communication interface circuit, and the output end of the second power supply circuit is respectively connected to the power supply ends of the digital circuit breaker control circuit and the first CAN communication interface circuit; the power input ends of the microcomputer line protection measurement and control device, the interactive digital display screen, the first power supply circuit and the second power supply circuit are connected to a public AC power supply.

[0007] The microcomputer line protection measurement and control device, digital terminal main control circuit and digital terminal auxiliary control circuit described in the above technical solution can be arranged in the instrument room of the power switch cabinet, the interactive digital display screen can be arranged on the casing of the power switch cabinet with its screen facing outside the casing, and the digital circuit breaker control circuit can be arranged in the circuit breaker room of the power switch cabinet.

[0008] The microcomputer line protection and measurement and control device described in the above technical solution can adopt products such as the Guodian South End NSR305 microcomputer line protection and measurement and control device or the Guodian South Automatic PDS761 microcomputer line protection and measurement and control device; the main control microcontroller can adopt a microcontroller chip such as STM32F407LQFP100 or STM32F405LQFP100, and an alternative model can adopt a microcontroller chip such as NS32F407LQFP100 or NS32F405LQFP100. Microcontroller chip; the interrupt control microcontroller and the auxiliary control microcontroller can adopt STM32F103LQFP64 or STM32F103RCT6 microcontroller chips, and alternative models can adopt CKS32F103LQFP64 or CKS32F103RCT6 and other types of microcontroller chips; the interactive digital display can adopt the smart touch-screen all-in-one machine of Maichong Technology F16G28-6W-BT or F16G20-C1-W-BT.

[0009] The various main control execution circuits on the power switch cabinet described in the above technical solution may include the existing ground knife opening / closing drive control circuit, chassis vehicle drive control circuit, ground knife operation hole locking drive control circuit, main control travel switch status information collection circuit, equipment operation management and status collection circuit associated with the digital terminal main control circuit, etc.

[0010] The various auxiliary control execution circuits on the power switch cabinet described in the above technical solution may include the heater power switch control circuit, lighting power switch control circuit, fan power switch control circuit, visualization equipment monitoring and management circuit, auxiliary control limit switch and auxiliary switch status information collection circuit, equipment operation management and status collection circuit associated with the digital terminal auxiliary control circuit, etc.

[0011] The various circuit breaker execution circuits on the power switch cabinet described in the above technical solution may include the circuit breaker opening / closing / energy storage control circuit, the chassis swing-out / swing-in control circuit, the circuit breaker closing lock drive control circuit, the chassis swing-in lock drive control circuit, the circuit breaker travel switch and auxiliary switch status information collection circuit, the equipment operation management and status collection circuit associated with the digital circuit breaker control circuit, etc.

[0012] The first, second and third CAN communication interface circuits of the above technical solution can adopt the same circuit structure, and the circuit structure can include resistors 1 to 4, capacitor 1, CAN isolation transceiver module, common mode inductor, diodes 1 to 2, bidirectional transient suppression diode 1, three-pole gas discharge tube and fuse 1 to fuse 2; wherein the RXD terminal of the CAN isolation transceiver module is connected to one end of resistor 1, and the other end of resistor 1 is connected to the CANRX end of the corresponding microcontroller; the TXD terminal of the CAN isolation transceiver module is connected to one end of resistor 2, and the other end of resistor 2 is connected to the CANTX end of the corresponding microcontroller; the GND end of the CAN isolation transceiver module is grounded; the VCC end of the CAN isolation transceiver module is the power supply end; the CANH end of the CAN isolation transceiver module is connected to the input end 1 of the common mode inductor, and the corresponding output end of the input end 1 of the common mode inductor is connected to one end of the bidirectional transient suppression diode 1 in one way and one end of the fuse 1 in the other way, and the other end of the fuse 1 is connected to One end of the three-pole gas discharge tube is connected to one end of resistor four and then serves as the CANH end of a CAN-BUS interface connected to the microcomputer line protection, measurement and control device; the CANL end of the CAN isolation transceiver module is connected to the input end two of the common-mode inductor; the corresponding output end of the input end two of the common-mode inductor is connected to the negative electrode of diode one, then to the positive electrode of diode two, and then to one end of fuse two; the other end of fuse two is connected to the other end of the three-pole gas discharge tube, then to the other end of resistor four, and then serves as the CANL end of the CAN-BUS interface connected to the microcomputer line protection, measurement and control device; the CANG end of the CAN isolation transceiver module is connected to one end of resistor three and the other end of capacitor one; the other ends of resistor three and capacitor one are connected in parallel with the ground end of the three-pole gas discharge tube and then serve as the CANG end of the CAN-BUS interface connected to the microcomputer line protection, measurement and control device; the positive electrode of diode one and the negative electrode of diode two are connected in parallel with the other end of bidirectional transient suppression diode one.

[0013] The digital terminal main control circuit, digital circuit breaker control circuit and digital terminal auxiliary control circuit described in the above technical solution can be respectively composed of corresponding main control, auxiliary control or circuit breaker control microcontrollers and their peripheral crystal oscillator circuits, asynchronous reset circuits, startup mode selection circuits connected to the BOOT1 end, startup mode selection circuits connected to the BOOT0 end and running program input circuits.

[0014] The circuit structure of the first power supply circuit of the above technical solution may include an AC power input interface 1, fuses 3 to 4, an AC-DC power supply module 1, capacitors 2 to 7, a bidirectional transient suppression diode 2, a voltage stabilizing integrated circuit, and a low-voltage difference linear integrated circuit; wherein the live wire of the AC power input interface 1 is connected to one end of the fuse 3, the other end of the fuse 3 is connected to the AC (N) end of the AC-DC power supply module 1, and the neutral wire of the AC power input interface 1 is connected to the AC (L) end of the AC-DC power supply module 1; the +Vo terminal of the AC-DC power supply module 1 is connected to one end of the capacitor 2, which is then connected to one end of the capacitor 3, which is then connected to one end of the bidirectional transient suppression diode 2, which is then connected to one end of the fuse 4, and the -Vo terminal of the AC-DC power supply module 1 is connected to the capacitor 2 The other end of the capacitor is connected to the ground and then to the other end of the capacitor three and then to the other end of the bidirectional transient suppression diode two. The other end of the fuse four is connected to the Vin end of the voltage regulator integrated circuit in one path and to one end of the capacitor four in the other path. The other end of the capacitor four is grounded; the GND end of the voltage regulator integrated circuit is grounded, the +Vo end of the voltage regulator integrated circuit is connected to one end of the capacitor five and then to one end of the capacitor six and then to the VIN end of the low-voltage difference linear integrated circuit, and the other ends of the capacitor five and capacitor six are both grounded; the GND end of the low-voltage difference linear integrated circuit is grounded, the VOUT end of the low-voltage difference linear integrated circuit is used as the output end of the first power supply circuit in one path, and the other path is connected to one end of the capacitor seven and to the other VOUT end of the low-voltage difference linear integrated circuit in another path. The other end of the capacitor seven is grounded.

[0015] The circuit structure of the second power supply circuit of the above technical solution may include an AC power input interface 2, fuses 5 to 6, an AC-DC power supply module 2, capacitors 8 to 11, bidirectional transient suppression diodes 3 to 4, resistors 5 to 8, and a photocoupler; wherein the live wire of the AC power input interface 2 is connected to one end of the fuse 5, the other end of the fuse 5 is connected to the AC (N) end of the AC-DC power supply module 2, and the neutral wire of the AC power input interface 2 is connected to the AC (L) end of the AC-DC power supply module 2; the +Vo end of the AC-DC power supply module 2 is connected to one end of the capacitor 8, then to one end of the capacitor 9, then to one end of the bidirectional transient suppression diode 3, then to one end of the fuse 6, and the -V end of the AC-DC power supply module 2 is connected to one end of the capacitor 8. The other end of capacitor 8 is connected to ground, then to the other end of capacitor 9, and then to the other end of bidirectional transient suppression diode 3. The other end of fuse 6 is connected to one end of resistor 5; the other end of resistor 5 is connected to one end of resistor 6 in one path, and the other end is connected to one end of bidirectional transient suppression diode 4 in the other path. The other end of resistor 6 is connected to one end of resistor 7, then to one end of capacitor 10, and then to the positive input terminal of the photoelectric coupler. The other end of bidirectional transient suppression diode 4 is connected to the other end of resistor 7, then to the other end of capacitor 10, then to ground, and then to the negative input terminal of the photoelectric coupler; the output collector of the photoelectric coupler is connected to one end of resistor 8 in one path, and the other end is connected to one end of capacitor 11 in the other path. The other end of resistor 8 serves as the output end of the second power supply circuit. The output emitter of the photoelectric coupler and the other end of capacitor 11 are both grounded.

[0016] In the above technical solution, the output collector of the optocoupler of the second power supply circuit can be further connected to an I / O terminal of the shutdown control microcontroller, and when the second power supply circuit loses power, a power-off signal is fed back to the shutdown control microcontroller.

[0017] The beneficial effects of the present invention are as follows: first, a microcomputer line protection and measurement and control device is used as the data processing core to construct a full-cabinet digital monitoring and intelligent control system for a power switchgear. Through a single circuit system, multiple functions such as protection, measurement, monitoring, control, human-computer interaction, and communication are integrated into the entire cabinet, saving a large amount of cabinet installation space and control cables, thereby realizing a new generation of switchgear monitoring system with full digital monitoring, intelligent control, and high-reliability protection. Second, a first CAN bus circuit and a second CAN bus circuit are used to transmit two types of data, control and monitoring, respectively. Specifically, the first CAN bus circuit is connected between the microcomputer line protection and measurement and control device and the digital terminal main control circuit and the digital circuit breaker control circuit, and is used to separately transmit control data that must be executed quickly, accurately, and effectively to avoid transmission congestion caused by monitoring data with a large amount of information. The second CAN bus circuit is connected between the microcomputer line protection and measurement and control device and the digital terminal auxiliary control circuit and the interactive digital display screen, and is used to separately transmit various types of monitoring data to avoid mixing monitoring data with control data and being easily interfered with by sudden changes in control signals, thereby ensuring the authenticity and stability of status feedback. Third, since the digital terminal is separated into independent digital terminal main control circuits and digital terminal auxiliary control circuits, the digital circuit breaker control circuit is also set as an independent circuit. The digital terminal main control circuit has a main control microcontroller, the digital terminal auxiliary control circuit has an auxiliary control microcontroller, and the digital circuit breaker control circuit has a circuit breaker control microcontroller. Therefore, for control data that focuses on high security level requirements, more stringent encryption and verification mechanisms can be configured to ensure the security of key operation instructions; for monitoring data that focuses on applicability requirements, adaptive transmission strategies can be used to set them up, while ensuring a certain degree of reliability, while optimizing resource utilization as much as possible; through the classification and setting of the main control microcontroller, auxiliary control microcontroller and circuit breaker control microcontroller, data at different security levels can be targetedly protected and handled, thereby improving the overall system's higher security protection level, better applicability and stronger expansion capabilities.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a block diagram of an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A block diagram of a digital terminal main control circuit, a digital terminal auxiliary control circuit or a digital circuit breaker control circuit.

[0021] Figure 3 yes Figure 1 A schematic diagram of a circuit principle.

[0022] Figure 4 yes Figure 3 An enlarged schematic diagram of the first, second or third CAN communication interface circuit.

[0023] Figure 5 yes Figure 3 An enlarged schematic diagram of the digital terminal main control circuit.

[0024] Figure 6 yes Figure 3 An enlarged schematic diagram of the digital terminal auxiliary control circuit or the digital circuit breaker control circuit.

[0025] Figure 7 yes Figure 3 An enlarged schematic diagram of the first power supply circuit in FIG.

[0026] Figure 8 yes Figure 3 An enlarged schematic diagram of the second power supply circuit in FIG.

[0027] In the figure: 1. Microcomputer circuit protection and measurement and control device; 2. Digital terminal main control circuit; 3. Digital circuit breaker control circuit; 4. Digital terminal auxiliary control circuit; 5. Interactive digital display screen; 6. First power supply circuit; 7. Second power supply circuit; 8. First bus; 9. First CAN communication interface circuit; 10. Second CAN communication interface circuit; 11. Second bus; 12. Third CAN communication interface circuit; 13. Main control microcontroller; 14. Break control microcontroller; 15. Auxiliary control microcontroller; 16. Main control, auxiliary control or break control microcontroller; 17. Crystal oscillator circuit; 18. Asynchronous reset circuit; 19. Startup mode selection circuit connected to BOOT1 terminal; 20. Startup mode selection circuit connected to BOOT0 terminal; 21. Running program input circuit. DETAILED DESCRIPTION

[0028] Reference Figure 1The fully digital monitoring and control device of the power switch cabinet is characterized by comprising: a microcomputer line protection measurement and control device 1 with two or more CAN-BUS interfaces, a digital terminal main control circuit 2, a digital circuit breaker control circuit 3, a digital terminal auxiliary control circuit 4, an interactive digital display screen 5, a first CAN bus circuit, a second CAN bus circuit, a first power supply circuit 6 and a second power supply circuit 7; wherein the first CAN bus circuit is composed of a first bus 8, a first CAN communication interface circuit 9 on a first parallel terminal a at one end of the first bus 8 and a second CAN communication interface circuit 10 on a second parallel terminal b at one end of the first bus 8; the second CAN bus circuit is composed of a second bus 11, the The third CAN communication interface circuit 12 on the first parallel terminal c at one end of the second bus 11 and the second parallel terminal d at one end of the second bus 11 are composed; the digital terminal main control circuit 2 includes a main control microcontroller 13, the digital circuit breaker control circuit 3 includes a break control microcontroller 14, and the digital terminal auxiliary control circuit 4 includes an auxiliary control microcontroller 15. The main control microcontroller 13, the break control microcontroller 14 and the auxiliary control microcontroller 15 all adopt STM32F series and alternative series microcontroller chips; the other end e of the first bus 8 is connected to the first CAN-BUS interface of the microcomputer line protection measurement and control device 1, and the first CAN communication interface circuit 9 is connected to the main control microcontroller The CAN communication terminal of the controller 13, the second CAN communication interface circuit 10 is connected to the CAN communication terminal of the interruption control microcontroller 14; the other end f of the second bus 11 is connected to the second CAN-BUS interface of the microcomputer line protection measurement and control device 1, the third CAN communication interface circuit 12 is connected to the CAN communication terminal of the auxiliary control microcontroller 15, and the second parallel end d at one end of the second bus 11 is connected to the third CAN-BUS interface of the interactive digital display screen 5; the main control microcontroller 13 has several I / O interfaces for respectively connecting to each main control execution circuit on the power switch cabinet, and the auxiliary control microcontroller 15 has several I / O interfaces for respectively connecting to the power switch The auxiliary control execution circuits on the cabinet, the said circuit breaker control microcontroller 14 has several I / O interfaces for respectively connecting to the various circuit breaker execution circuits on the power switch cabinet; the output end VCC1 of the first power supply circuit 6 is respectively connected to the power supply ends VCC of the said digital terminal main control circuit 2, the digital terminal auxiliary control circuit 4, the first CAN communication interface circuit 9 and the third CAN communication interface circuit 12, the output end VCC2 of the second power supply circuit 7 is respectively connected to the power supply ends VCC of the said digital circuit breaker control circuit 3 and the second CAN communication interface circuit 10; the power input ends of the said microcomputer line protection measurement and control device 1, the interactive digital display screen 5, the first power supply circuit 6 and the second power supply circuit 7 are connected to a common AC power supply.

[0029] In addition, the microcomputer line protection measurement and control device 1, the digital terminal main control circuit 2, the digital terminal auxiliary control circuit 4, the first CAN communication interface circuit 9 and the third CAN communication interface circuit 12 are all arranged in the instrument room of the power switch cabinet, the interactive digital display screen 5 is arranged on the casing of the power switch cabinet, and its screen faces outside the casing, and the digital circuit breaker control circuit 3 and the second CAN communication interface circuit 10 are arranged in the circuit breaker room of the power switch cabinet.

[0030] The microcomputer line protection and measurement and control device 1 adopts the State Grid South End NSR305 microcomputer line protection and measurement and control device, the main control microcontroller 13 adopts the STM32F407LQFP100 microcontroller chip, the interruption control microcontroller 14 and the auxiliary control microcontroller 15 both adopt the STM32F103LQFP64 microcontroller chip, and the interactive digital display screen 5 adopts the Maichong Technology F16G28-6W-BT smart touch-screen all-in-one computer.

[0031] Reference Figure 2 The digital terminal main control circuit 2, the digital circuit breaker control circuit 3 and the digital terminal auxiliary control circuit 4 are respectively composed of the corresponding main control, auxiliary control or breaker control microcontroller 16 and its peripheral crystal oscillator circuit 17, asynchronous reset circuit 18, startup mode selection circuit 19 connected to the BOOT1 end, startup mode selection circuit 20 connected to the BOOT0 end and running program input circuit 21.

[0032] Reference Figure 3 , Figure 1A circuit principle diagram, characterized in that it includes: a microcomputer line protection measurement and control device 1 with two CAN-BUS interfaces, a digital terminal main control circuit 2, a digital circuit breaker control circuit 3, a digital terminal auxiliary control circuit 4, an interactive digital display screen 5, a first CAN bus circuit, a second CAN bus circuit, a first power supply circuit 6 and a second power supply circuit 7; wherein the first CAN bus circuit is composed of a first bus 8, a first CAN communication interface circuit 9 on a first parallel end of one end of the first bus 8 and a second CAN communication interface circuit 10 on a second parallel end of one end of the first bus 8; the second CAN bus circuit is composed of a second bus 11, a second bus 11- The first bus 8 is connected to the first CAN-BUS interface of the microcomputer line protection measurement and control device 1, and the first CAN communication interface circuit 9 is connected to the C of the main control microcontroller 13. AN communication terminal, the second CAN communication interface circuit 10 is connected to the CAN communication terminal of the interruption control microcontroller 14; the other end of the second bus 11 is connected to the second CAN-BUS interface of the microcomputer line protection measurement and control device 1, the third CAN communication interface circuit 12 is connected to the CAN communication terminal of the auxiliary control microcontroller 15, and the second parallel end of one end of the second bus 11 is connected to the third CAN-BUS interface of the interactive digital display screen 5; the main control microcontroller 13 has a plurality of I / O interfaces for respectively connecting to each main control execution circuit on the power switch cabinet, and the auxiliary control microcontroller 15 has a plurality of I / O interfaces for respectively connecting to each main control execution circuit on the power switch cabinet. An auxiliary control execution circuit is provided, and the breaking control microcontroller 14 has several I / O interfaces for respectively connecting to the various circuit breaker execution circuits on the power switch cabinet; the output end VCC1 of the first power supply circuit 6 is respectively connected to the power supply ends VCC of the digital terminal main control circuit 2, the digital terminal auxiliary control circuit 4, the first CAN communication interface circuit 9 and the third CAN communication interface circuit 12, and the output end VCC2 of the second power supply circuit 7 is respectively connected to the power supply ends VCC of the digital circuit breaker control circuit 3 and the second CAN communication interface circuit 10; the power input ends of the microcomputer line protection measurement and control device 1, the interactive digital display screen 5, the first power supply circuit 6 and the second power supply circuit 7 are connected to a public AC power supply.

[0033] Reference Figure 4The first CAN communication interface circuit 9, the second CAN communication interface circuit 10 or the third CAN communication interface circuit 12 adopts the same circuit structure, which can include resistors R1 to R4, capacitor C1, TD301MCAN type CAN isolation transceiver module IC1, common mode inductor CL, diodes D1 to D2, bidirectional transient suppression diode TVS1 and three-pole gas discharge tube GDT, fuses F1 to F2; wherein the RXD terminal of the CAN isolation transceiver module IC1 is connected to one end of the resistor R1, and the resistor R1 is connected to the RXD terminal of the CAN isolation transceiver module IC1. The other end is connected to the CANRX end of the corresponding microcontroller; the TXD end of the CAN isolation transceiver module IC1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the CANTX end of the corresponding microcontroller; the GND end of the CAN isolation transceiver module IC1 is grounded; the VCC end of the CAN isolation transceiver module IC1 is the power supply end VCC; the CANH end of the CAN isolation transceiver module IC1 is connected to the input end 1 of the common mode inductor CL, and the corresponding output end of the input end 1 of the common mode inductor LC is connected to one end of the bidirectional transient suppression diode TVS1, and the other end is connected to the fuse One end of the fuse F1, the other end of the fuse F1 is connected to one end of the three-pole gas discharge tube GDT and then to one end of the resistor R4 as the CANH end of the corresponding CAN-BUS interface of the microcomputer line protection and measurement and control device 1; the CANL end of the CAN isolation transceiver module IC1 is connected to the second input end of the common-mode inductor CL, the corresponding output end of the second input end of the common-mode inductor CL is connected to the negative electrode of the diode D1 and then to the positive electrode of the diode D2 and then to one end of the fuse F2, the other end of the fuse F2 is connected to the other end of the three-pole gas discharge tube GDT and then to the resistor R4. The other end is then used as the CANL end connected to the corresponding CAN-BUS interface of the microcomputer line protection, measurement and control device 1; the CANG end of the CAN isolation transceiver module IC1 is connected to one end of the resistor R3 on one path, and to one end of the capacitor C1 on the other path. The other end of the resistor R3 and the other end of the capacitor C1 are connected in parallel to the ground end of the three-pole gas discharge tube GDT and then serve as the CANG end connected to the corresponding CAN-BUS interface of the microcomputer line protection, measurement and control device 1; the anode of the diode D1 and the cathode of the diode D2 are connected in parallel to the other end of the bidirectional transient suppression diode TVS1.

[0034] Reference Figure 7The circuit structure of the first power supply circuit includes an AC power input interface J1, fuses F3 to F4, an LD40-23B24R2 type AC-DC power supply module IC2, capacitors C2 to C7, a bidirectional transient suppression diode TVS2, an M7805 type voltage regulator integrated circuit IC3, and an AMS1117-3.3 type low voltage drop linear integrated circuit IC4; wherein the live wire 1 of the AC power input interface J1 is connected to one end of the fuse F3, the other end of the fuse F3 is connected to the AC (N) end of the AC-DC power supply module IC2, and the neutral wire 2 of the AC power input interface J1 is connected to the AC (L) end of the AC-DC power supply module IC2; the +Vo end of the AC-DC power supply module IC2 is connected to one end of the capacitor C2, then to one end of the capacitor C3, then to one end of the bidirectional transient suppression diode TVS2, and then to one end of the fuse F4, and the AC-DC power supply module The -Vo terminal of IC2 is connected to the other end of capacitor C2, which is then grounded, and then connected to the other end of capacitor C3, and then to the other end of the bidirectional transient suppression diode TVS2. The other end of fuse F4 is connected to the Vin terminal of the voltage regulator integrated circuit IC3 in one path, and to one end of capacitor C4 in the other path, and the other end of capacitor C4 is grounded; the GND terminal of the voltage regulator integrated circuit IC3 is grounded, the +Vo terminal of the voltage regulator integrated circuit IC3 is connected to one end of capacitor C5, and then to one end of capacitor C6, and then to the VIN terminal of the low-voltage difference linear integrated circuit IC4, and the other ends of capacitor C5 and capacitor C6 are both grounded; the GND terminal of the low-voltage difference linear integrated circuit IC4 is grounded, the VOUT terminal of the low-voltage difference linear integrated circuit IC4 serves as the output terminal VCC1 of the first power supply circuit 6 in one path, and is connected to one end of capacitor C7 in the other path, and is also connected to the other VOUT terminal of the low-voltage difference linear integrated circuit IC4 in another path, and the other end of capacitor C7 is grounded.

[0035] Reference Figure 8The circuit structure of the second power supply circuit 7 includes an AC power input interface J2, fuses F5 to F6, an LD40-23B24R2 type AC-DC power supply module IC5, capacitors C8 to C11, bidirectional transient suppression diodes TVS3 to TVS4, resistors R5 to R8, and a PC817C type photocoupler IC6; wherein the live wire 1 of the AC power input interface J2 is connected to one end of the fuse F5, the other end of the fuse F5 is connected to the AC (N) end of the AC-DC power supply module IC5, and the neutral wire 2 of the AC power input interface J2 is connected to the AC (L) end of the AC-DC power supply module IC5; the +Vo end of the AC-DC power supply module IC5 is connected to one end of the capacitor C8, then to one end of the capacitor V9, then to one end of the bidirectional transient suppression diode TVS3, then to one end of the fuse F6, and the -Vo end of the AC-DC power supply module IC5. The other end of the termination capacitor C8 is then connected to ground, and then to the other end of the capacitor C9, and then to the other end of the bidirectional transient suppression diode TVS3. The other end of the fuse F6 is connected to one end of the resistor R5; the other end of the resistor R5 is connected to one end of the resistor R6 in one path and to one end of the bidirectional transient suppression diode TVS4 in the other path. The other end of the resistor R6 is connected to one end of the resistor R7, and then to one end of the capacitor C10, and then to the positive input terminal 1 of the photocoupler IC6. The other end of the bidirectional transient suppression diode TVS4 is connected to the other end of the resistor R7, and then to the other end of the capacitor C10, and then to ground, and then to the negative input terminal 2 of the photocoupler IC6; the output collector terminal 4 of the photocoupler IC6 is connected to one end of the resistor R8 in one path and to one end of the capacitor C11 in the other path. The other end of the resistor R8 serves as the output terminal VCC2 of the second power supply circuit 7. The output emitter terminal 3 of the photocoupler IC6 and the other end of the capacitor C11 are both grounded.

[0036] The output collector 4 end of the optocoupler IC6 of the second power supply circuit 7 has another PC10 connected to an I / O end of the shutdown control microcontroller 14. When the second power supply circuit 7 loses power, a power-off signal is fed back to the shutdown control microcontroller 14.

[0037] Reference Figure 6The digital terminal auxiliary control circuit 4 or the digital circuit breaker control circuit 3 has the same circuit structure, including an STM32F103LQFP64 microcontroller chip IC7 (auxiliary control microcontroller or circuit breaker control microcontroller) and its peripheral crystal oscillator circuit composed of a crystal oscillator B1 and capacitors C12 to C13, an asynchronous reset circuit composed of a resistor R9, a capacitor C14 and a switch K1, a startup mode selection circuit connected to the BOOT1 terminal composed of a resistor R10, and a startup mode selection circuit connected to the BOOT0 terminal composed of a resistor R11 and a switch K2. The circuit is a running program input circuit composed of an input interface J3; one end of the crystal oscillator B1 is connected to the 5th terminal of the microcontroller chip IC7, and the other end is connected to one end of the capacitor C12; the other end of the crystal oscillator B1 is connected to the 6th terminal of the microcontroller chip IC7, and the other end is connected to one end of the capacitor C13; the other ends of the capacitors C12 and C13 are both grounded; one end of the resistor R9 is connected to the 7th terminal of the microcontroller chip IC7, the other end is connected to one end of the capacitor C14, and the other end is connected to one end of the switch K1; one end of the resistor R9 is the power supply terminal VCC , the other end of capacitor C14 and switch K1 are both grounded; one end of resistor R10 is connected to terminal 28 of microcontroller chip IC7, and the other end thereof is grounded; one end of resistor R11 is connected to terminal 60 of microcontroller chip IC7, and the other end thereof is connected to one end of switch K2, the other end of switch K2 is power supply terminal VCC, and the other end of resistor R11 is grounded; terminal 3 of input interface J3 is connected to terminal 43 of microcontroller chip IC7, terminal 2 of input interface J3 is connected to terminal 42 of microcontroller chip IC7, and terminal 1 of input interface J3 is grounded; terminal 13 of microcontroller chip IC7 , 19, 32, 48 and 64 are all power supply terminals VCC, terminals 12, 18, 31, 47 and 63 of the microcontroller chip IC7 are all ground terminals, terminals 44 and 45 of the microcontroller chip IC7 are respectively CANRX and CANTX terminals connected to the second CAN communication interface circuit or the third CAN communication interface circuit, and terminals 2 to 4, 8 to 11, 14 to 17, 20 to 27, 29 to 30, 33 to 41, 50 to 59 and 61 to 62 of the microcontroller chip IC7 have a total of 42 I / O terminals.

[0038] Reference Figure 5The circuit structure of the digital terminal main control circuit 2 includes an STM32F407LQFP100 microcontroller chip IC8 (main microcontroller) and its peripheral crystal oscillator circuit composed of a crystal oscillator B2 and capacitors C16 and C17, an asynchronous reset circuit composed of a resistor R12, a capacitor C18 and a switch K3, a startup mode selection circuit connected to the BOOT1 end composed of a resistor R13, a startup mode selection circuit connected to the BOOT0 end composed of a resistor R14 and a switch K4, and a running program input circuit composed of an input interface J4. Input circuit; wherein one end of the crystal oscillator B2 is connected to the 12th terminal of the microcontroller chip IC8, and the other end thereof is connected to one end of the capacitor C16; the other end of the crystal oscillator B2 is connected to the 13th terminal of the microcontroller chip IC8, and the other end thereof is connected to one end of the capacitor C15; the other ends of the capacitors C16 and C15 are both grounded; one end of the resistor R12 is connected to the 14th terminal of the microcontroller chip IC8, and the other end thereof is connected to one end of the capacitor C18, and the other end thereof is connected to one end of the switch K3; one end of the resistor R12 is the power supply terminal VCC, and the capacitor C18 and the switch K3 are connected. The other end of each is grounded; one end of the resistor R13 is connected to the 37 terminal of the microcontroller chip IC8, and the other end thereof is grounded; one end of the resistor R14 is connected to the 94 terminal of the microcontroller chip IC8, and the other end thereof is connected to one end of the switch K4, the other end of the switch K4 is the power supply terminal VCC, and the other end of the resistor R14 is grounded; the 3 terminal of the input interface J4 is connected to the 69 terminal of the microcontroller chip IC8, the 2 terminal of the input interface J4 is connected to the 68 terminal of the microcontroller chip IC8, and the 1 terminal of the input interface J4 is grounded; the 11 terminal, the 19 terminal, the 28 terminal, and the 3 terminal of the microcontroller chip IC8 are connected to the 69 terminal of the microcontroller chip IC8, and the 1 terminal of the input interface J4 are grounded; the 11 terminal, the 19 terminal, the 28 terminal, and the 3 terminal of the microcontroller chip IC8 are connected to the 68 terminal of the microcontroller chip IC8, and the 1 terminal of the microcontroller chip IC8 are connected to the 68 terminal of the microcontroller chip IC8. Terminals 50, 75, and 100 are all power supply terminals VCC, terminals 10, 20, 27, 74, and 99 of the microcontroller chip IC8 are all ground terminals, terminals 96 and 95 of the microcontroller chip IC8 are respectively CANRX and CANTX terminals connected to the first CAN communication interface circuit, and terminals 1 to 5, 7 to 9, 15 to 18, 23 to 26, 29 to 36, 38 to 48, 51 to 67, 70 to 71, 76 to 93, and 95 to 98 of the microcontroller chip IC8 have a total of 76 I / O terminals.

[0039] When in use, the corresponding operating program is input from the input interface J4 of the digital terminal main control circuit 2 to the main control microcontroller IC8, and the corresponding operating programs are input from the input interface J3 of the digital circuit breaker control circuit 3 and the digital terminal auxiliary control circuit 4 to the auxiliary control microcontroller and the interruption control microcontroller IC7 respectively; according to the operating program setting rules of the main control microcontroller IC8, each main control execution circuit on the power switch cabinet is connected to the corresponding I / O terminal of the main control microcontroller IC8; according to the operating program setting rules of the interruption control microcontroller IC7, each circuit breaker execution circuit on the power switch cabinet is connected to the corresponding I / O terminal of the interruption control microcontroller IC7; according to the operating program setting rules of the auxiliary control microcontroller IC7, Each auxiliary control execution circuit in the power switchgear is connected to the corresponding I / O terminal of the auxiliary control microcontroller IC7. After the power input terminals of the microcomputer line protection, measurement and control device 1, the interactive digital display screen 5, the first power supply circuit 6, and the second power supply circuit 7 are all connected to the common AC power supply, the fully digital monitoring and control device of the power switchgear begins operation. During operation, data between each main control execution circuit and each circuit breaker execution circuit and the microcomputer line protection, measurement and control device 1 is transmitted via the first CAN bus circuit, and data between each auxiliary control execution circuit and the interactive digital display screen 5 and the microcomputer line protection, measurement and control device 1 is transmitted via the second CAN bus circuit. In this way, the status and data of all operating devices in the power switchgear are displayed on the screen of the interactive digital display screen 5. All operating instructions requiring human operation are executed by touching the buttons displayed on the interactive digital display screen 5. Therefore, the microcomputer line protection, measurement and control device 1 directly issues the relevant execution circuits with the automated control instructions, thus achieving fully digital monitoring, intelligent control, and high-reliability protection management for the entire power switchgear.

Claims

1. A fully digital monitoring and control device for a power switch cabinet, characterized by: The invention comprises a microcomputer line protection and measurement and control device with two or more CAN-BUS interfaces, a digital terminal main control circuit, a digital circuit breaker control circuit, a digital terminal auxiliary control circuit, an interactive digital display screen, a first CAN bus circuit, a second CAN bus circuit, a first power supply circuit and a second power supply circuit; wherein the first CAN bus circuit is composed of a first bus, a first CAN communication interface circuit on a first parallel end of one end of the first bus, and a second CAN communication interface circuit on a second parallel end of one end of the first bus; the second CAN bus circuit is composed of a second bus, a third CAN communication interface circuit on a first parallel end of one end of the second bus, and a second parallel end of one end of the second bus; the digital terminal main control circuit includes a main control microcontroller, the digital circuit breaker control circuit includes a break control microcontroller, and the digital terminal auxiliary control circuit includes an auxiliary control microcontroller, and the main control microcontroller, the break control microcontroller and the auxiliary control microcontroller all adopt STM32F series and alternative series microcontroller chips; the other end of the first bus is connected to the first CAN-BUS interface of the microcomputer line protection and measurement and control device, and the first CAN communication interface circuit is connected to the CAN communication interface circuit of the main control microcontroller. The second CAN communication interface circuit is connected to the CAN communication terminal of the interruption control microcontroller; the other end of the second bus is connected to the second CAN-BUS interface of the microcomputer line protection and measurement and control device, the third CAN communication interface circuit is connected to the CAN communication terminal of the auxiliary control microcontroller, and the second parallel end of one end of the second bus is connected to the third CAN-BUS interface of the interactive digital display screen; the main control microcontroller has several I / O interfaces for respectively connecting to the main control execution circuits on the power switch cabinet, the auxiliary control microcontroller has several I / O interfaces for respectively connecting to the auxiliary control execution circuits on the power switch cabinet, and the interruption control microcontroller has several I / O interfaces for respectively connecting to the circuit breaker execution circuits on the power switch cabinet; the output end of the first power supply circuit is respectively connected to the power supply ends of the digital terminal main control circuit, the digital terminal auxiliary control circuit, the first CAN communication interface circuit and the second CAN communication interface circuit, and the output end of the second power supply circuit is respectively connected to the power supply ends of the digital circuit breaker control circuit and the first CAN communication interface circuit; the power input ends of the microcomputer line protection and measurement and control device, the interactive digital display screen, the first power supply circuit and the second power supply circuit are connected to a common AC power supply.

2. The fully digital monitoring and control device for a power switch cabinet according to claim 1 is characterized in that: The microcomputer line protection measurement and control device, the digital terminal main control circuit and the digital terminal auxiliary control circuit are arranged in the instrument room of the power switch cabinet, the interactive digital display screen is arranged on the casing of the power switch cabinet with its screen facing outside the casing, and the digital circuit breaker control circuit is arranged in the circuit breaker room of the power switch cabinet.

3. The fully digital monitoring and control device for a power switch cabinet according to claim 1 or 2, characterized in that: The first, second and third CAN communication interface circuits adopt the same circuit structure, and their circuit structures all include resistors 1 to 4, capacitor 1, a CAN isolation transceiver module, a common-mode inductor, diodes 1 to 2, a bidirectional transient suppression diode 1, a three-pole gas discharge tube and fuses 1 to 2; wherein the RXD terminal of the CAN isolation transceiver module is connected to one end of resistor 1, and the other end of resistor 1 is connected to the CANRX terminal of the corresponding microcontroller; the TXD terminal of the CAN isolation transceiver module is connected to one end of resistor 2, and the other end of resistor 2 is connected to the CANTX terminal of the corresponding microcontroller; The GND terminal of the CAN isolated transceiver module is grounded; the VCC terminal of the CAN isolated transceiver module is the power supply terminal; The CANH terminal of the CAN isolation transceiver module is connected to the input terminal 1 of the common mode inductor, and the corresponding output terminal of the input terminal 1 of the common mode inductor is connected to one end of the bidirectional transient suppression diode 1 and the other end of the fuse 1. The other end of the fuse 1 is connected to one end of the three-pole gas discharge tube and then to one end of the resistor 4, which is used as the CANH terminal of a CAN-BUS interface connected to the microcomputer line protection and measurement and control device; the CANL terminal of the CAN isolation transceiver module is connected to the input terminal 2 of the common mode inductor, and the corresponding output terminal of the input terminal 2 of the common mode inductor is connected to the negative electrode of the diode 1 and then to the positive electrode of the diode 2 and then to the fuse. One end of the first resistor is connected to one end of the second resistor, and the other end of the second fuse is connected to the other end of the three-pole gas discharge tube and then to the other end of the fourth resistor, and then serves as the CANL end of the CAN-BUS interface connected to the microcomputer line protection and measurement and control device; one end of the CANG end of the CAN isolation transceiver module is connected to one end of the third resistor, and the other end of the CANG end is connected to one end of the first capacitor, and the other end of the third resistor and the other end of the first capacitor are connected in parallel with the ground end of the three-pole gas discharge tube, and then serve as the CANG end of the CAN-BUS interface connected to the microcomputer line protection and measurement and control device; the positive electrode of the first diode and the negative electrode of the second diode are connected in parallel with the other end of the first bidirectional transient suppression diode.

4. The fully digital monitoring and control device for a power switch cabinet according to claim 1 or 2, characterized in that: The digital terminal main control circuit, digital circuit breaker control circuit and digital terminal auxiliary control circuit are respectively composed of corresponding main control, auxiliary control or circuit breaker control microcontrollers and their peripheral crystal oscillator circuits, asynchronous reset circuits, startup mode selection circuits connected to the BOOT1 terminal, startup mode selection circuits connected to the BOOT0 terminal and running program input circuits.

5. The fully digital monitoring and control device for a power switch cabinet according to claim 1 or 2, characterized in that: The circuit structure of the first power supply circuit includes an AC power input interface 1, fuses 3 to 4, an AC-DC power supply module 1, capacitors 2 to 7, a bidirectional transient suppression diode 2, a voltage stabilizing integrated circuit, and a low-voltage difference linear integrated circuit; wherein the live wire of the AC power input interface 1 is connected to one end of the fuse 3, the other end of the fuse 3 is connected to the AC (N) end of the AC-DC power supply module 1, and the neutral wire of the AC power input interface 1 is connected to the AC (L) end of the AC-DC power supply module 1; the +Vo terminal of the AC-DC power supply module 1 is connected to one end of the capacitor 2, then to one end of the capacitor 3, then to one end of the bidirectional transient suppression diode 2, then to one end of the fuse 4, and the -Vo terminal of the AC-DC power supply module 1 is connected to the other end of the capacitor 2. Then it is connected to ground, and then to the other end of capacitor three, and then to the other end of bidirectional transient suppression diode two. The other end of fuse four is connected to the Vin end of the voltage regulator integrated circuit in one path, and the other path is connected to one end of capacitor four, and the other end of capacitor four is grounded; the GND end of the voltage regulator integrated circuit is grounded, the +Vo end of the voltage regulator integrated circuit is connected to one end of capacitor five, and then to one end of capacitor six, and then to the VIN end of the low-voltage difference linear integrated circuit, and the other ends of capacitor five and capacitor six are both grounded; the GND end of the low-voltage difference linear integrated circuit is grounded, the VOUT end of the low-voltage difference linear integrated circuit is used as the output end of the first power supply circuit in one path, and the other path is connected to one end of capacitor seven, and the other path is connected to the other VOUT end of the low-voltage difference linear integrated circuit, and the other end of capacitor seven is grounded.

6. The fully digital monitoring and control device for a power switch cabinet according to claim 1 or 2, characterized in that: The circuit structure of the second power supply circuit includes an AC power input interface 2, fuses 5 to 6, an AC-DC power supply module 2, capacitors 8 to 11, bidirectional transient suppression diodes 3 to 4, resistors 5 to 8, and a photocoupler; wherein the live wire of the AC power input interface 2 is connected to one end of the fuse 5, the other end of the fuse 5 is connected to the AC (N) end of the AC-DC power supply module 2, and the neutral wire of the AC power input interface 2 is connected to the AC (L) end of the AC-DC power supply module 2; the +Vo terminal of the AC-DC power supply module 2 is connected to one end of the capacitor 8, which is then connected to one end of the capacitor 9, which is then connected to one end of the bidirectional transient suppression diode 3, which is then connected to one end of the fuse 6, and the -Vo terminal of the AC-DC power supply module 2 is connected to the capacitor 8. The other end of is connected to ground and then to the other end of capacitor nine and then to the other end of bidirectional transient suppression diode three. The other end of fuse six is ​​connected to one end of resistor five; the other end of resistor five is connected to one end of resistor six in one path and to one end of bidirectional transient suppression diode four in the other path; the other end of resistor six is ​​connected to one end of resistor seven and then to one end of capacitor ten in the input positive electrode of the photoelectric coupler; the other end of bidirectional transient suppression diode four is connected to the other end of resistor seven and then to the other end of capacitor ten in the other path and then to ground and to the input negative electrode of the photoelectric coupler; the output collector of the photoelectric coupler is connected to one end of resistor eight in one path and to one end of capacitor eleven in the other path; the other end of resistor eight serves as the output end of the second power supply circuit, and the output emitter of the photoelectric coupler and the other end of capacitor eleven are both grounded.

7. The fully digital monitoring and control device for a power switch cabinet according to claim 6 is characterized in that: Another path of the output collector of the optocoupler of the second power supply circuit is connected to an I / O terminal of the shutdown control microcontroller, and when the second power supply circuit is powered off, a power-off signal is fed back to the shutdown control microcontroller.

Images