Split type system of low-voltage intelligent circuit breaker and measurement control method

Abstract

The invention discloses a split-type system of a low-voltage intelligent circuit breaker and a measurement control method, and relates to the technical field of intelligent distribution automation equipment detection, the split-type system comprises a protection board card and a measurement module, the protection board card is responsible for a basic electrical protection function, is internally provided with a micro-control unit, and has two power supply modes, the key protection function can be maintained under various conditions; the measurement module performs advanced data analysis and communication, adopts a pluggable design, and is internally provided with a high-performance micro-control unit to realize functions of communication, metering and the like. The communication reliability between the two modules is ensured by designing a special communication interface and a specific verification algorithm, and stable and reliable control over the circuit breaker is achieved. Besides, the low-voltage intelligent circuit breaker remarkably improves the safety, the stability and the intelligent level of a low-voltage power distribution area through the innovative modular design, the communication mechanism and the data verification algorithm, and is suitable for the requirements of a modern intelligent power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent power distribution automation equipment detection, and in particular to a split system and a measurement and control method for a low-voltage intelligent circuit breaker. Background Art

[0002] As the "last mile" of people's livelihood power supply, low-voltage distribution substations are the key link to ensure the public's safe electricity experience. With the in-depth implementation of the country's "dual carbon" strategy and the rapid development of new power systems, low-voltage distribution networks are undergoing unprecedented changes. The large-scale access of new energy equipment such as distributed photovoltaics and electric vehicle charging piles has caused low-voltage distribution substations to evolve from traditional one-way energy flow, single user characteristics, and clear "source-grid-load" interfaces to a complex network form with two-way energy flow, diversified producer-consumer roles, and coexistence of multiple power supply points. This transformation not only poses new challenges to low-voltage safe electricity use, but also puts forward more urgent demands on the technological iteration and innovation of distribution equipment.

[0003] The evolution of distribution network has brought many new power distribution problems. First, during power outages and maintenance, photovoltaic equipment that is not disconnected from the grid may cause islanding effects and electric shock risks, while reverse heavy overload problems may cause abnormal increases in terminal voltage, increased line losses, and even transformer damage, all of which pose a serious threat to the safe operation of low-voltage distribution stations. Secondly, the architecture of low-voltage distribution networks is developing in a more intelligent and digital direction, which requires that technologies such as local networking and communication mechanisms in substations, subscription topics and message structures for cloud-edge interactions must be further improved and developed. Third, traditional purely mechanical or electrical molded case circuit breakers can no longer meet the complex needs of new IoT distribution stations and low-voltage safe power scenarios, and there is an urgent need to achieve technological breakthroughs in split assembly, miniaturized integration, modular interchangeability, rapid disconnection, and reliable communication.

[0004] In summary, with the deepening of the intelligent and digital transformation of low-voltage distribution substations, the limitations of traditional circuit breakers are gradually emerging. Traditional circuit breakers lack the intelligent monitoring and communication capabilities that match modern power systems in design, and cannot meet the real-time response to complex power flows and diversified user needs. In the face of rapidly changing grid conditions, it is also difficult to achieve rapid disconnection and high-reliability communication, which may lead to untimely fault handling in an emergency and increase the risk of grid operation. In addition, traditional circuit breakers lack flexibility in modular design and functional integration, and the maintenance and upgrade process is complicated, which is not conducive to the rapid deployment and flexible adjustment of smart grids. These deficiencies of traditional circuit breakers have limited the stability and reliability of new low-voltage distribution substations to a certain extent. Summary of the invention

[0005] In view of the above existing problems, the present invention is proposed.

[0006] Therefore, in order to overcome the shortcomings of existing circuit breakers in the new type of IoT low-voltage distribution station area, the present invention proposes a split system and measurement and control method of a low-voltage intelligent circuit breaker, which can realize intelligent and precise control of the circuit breaker with a compact and simple structure.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a split system of a low-voltage intelligent circuit breaker, comprising:

[0009] The protection board is used to collect electrical data and send it to the measurement module, and receive the control signal fed back by the measurement module, and perform electrical protection calculation and low-voltage intelligent circuit breaker action control in real time according to the control signal;

[0010] The measurement module is used to receive the electrical data sent by the protection board, perform advanced data analysis and calculation on the electrical data, and feed back the analyzed control signal to the protection board, and is also used for external data communication.

[0011] As a preferred solution of the split system of the low-voltage intelligent circuit breaker described in the present invention, wherein: the protection board includes a microcontroller unit, an analog-to-digital converter, a voltage transformer, a current transformer, an electrically erasable programmable read-only memory, a temperature sensor, an internal interface, and a switch interface;

[0012] The microcontroller unit is connected to the analog-to-digital converter via an SPI interface, the microcontroller unit is connected to the electrically erasable programmable read-only memory via an I2C interface, the microcontroller unit is connected to the internal interface via a TTL serial communication port and a general input / output port, the microcontroller unit is connected to the switch interface via a general input / output port, the analog-to-digital converter is respectively connected to the voltage transformer, the current transformer, and the temperature sensor, and the electrically erasable programmable read-only memory is connected to the internal interface via an I2C interface;

[0013] The internal interface is connected to the internal interface of the measurement module through a communication control selection pin, a one-way data transmission pin, a two-way data interaction pin and a communication clock pin to send electrical data and receive feedback control signals. The switch interface is used to collect electrical data externally, and the microcontroller unit is used to perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time. As a preferred solution of the split system of the low-voltage intelligent circuit breaker described in the present invention, the microcontroller unit is used to perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time, and the internal communication function, electrical protection function, gate position state sensing function, and tripping state sensing function are realized through the real-time electrical protection calculations and low-voltage intelligent circuit breaker action control, wherein the electrical protection function includes overvoltage protection, undervoltage protection, three-stage current protection, and leakage protection.

[0014] As a preferred solution of the split system of the low-voltage intelligent circuit breaker described in the present invention, wherein: the measurement module includes a high-performance microcontroller unit, an internal interface, an external interface, a topology unit, a metering IC unit, a broadband carrier communication module, a Bluetooth module, an AC / DC module, a ferroelectric memory, a clock module, and a flash memory;

[0015] The high-performance microcontroller unit is connected to the topology unit, the broadband carrier communication module, and the Bluetooth module respectively through the TTL serial communication port, the high-performance microcontroller unit is connected to the metering IC unit and the flash memory respectively through the SPI interface, the high-performance microcontroller unit is connected to the ferroelectric memory and the clock module through the I2C interface, and the high-performance microcontroller unit is also connected to the AC / DC module, and the high-performance microcontroller unit is used to perform advanced data analysis and calculation on the electrical data;

[0016] The internal interface is connected to the high-performance microcontroller unit through a general input / output port, a TTL serial communication port, and an I2C interface respectively. The internal interface is also connected to the metering IC unit, the broadband carrier communication module, and the AC / DC module respectively. The internal interface is connected to the internal interface of the protection board through a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin, and a communication clock pin to receive electrical data and feedback control signals;

[0017] The external interface is connected to the high-performance micro control unit via a TTL serial communication port and a general input / output port, and the external interface is used for external data communication.

[0018] As a preferred solution of the split system of the low-voltage intelligent circuit breaker described in the present invention, the high-performance microcontroller unit is used to perform advanced data analysis and calculation on the electrical data, and realize the electric energy metering function, electrical protection function and topology identification function through advanced data analysis and calculation, wherein the electrical protection function includes undervoltage protection, undercurrent protection, reverse flow protection, power factor protection, three-phase current unbalance protection, phase loss protection, frequency protection, and over-temperature protection.

[0019] As a preferred solution of the split system of the low-voltage intelligent circuit breaker described in the present invention, the external interface (600) includes a remote signal interface, an RS485 serial communication port, and a power supply port. In a second aspect, the present invention provides a split measurement control method for a low-voltage intelligent circuit breaker, comprising:

[0020] The protection board collects electrical data and sends it to the measurement module, and receives the control signal fed back by the measurement module, and performs electrical protection calculation and low-voltage intelligent circuit breaker action control in real time according to the control signal;

[0021] The measuring module receives the electrical data sent by the protection board, performs advanced data analysis and calculation on the electrical data, and feeds back the analyzed control signal to the protection board. The measuring module also performs data communication externally.

[0022] As a preferred solution of the split measurement control method of the low-voltage intelligent circuit breaker described in the present invention, wherein: the protection board and the measurement module adopt a split design, the protection board is responsible for basic data acquisition and acts as a slave, the measurement module performs advanced data analysis and calculation and acts as a host, and the host controls the communication frequency to realize status reporting and information sending;

[0023] As a preferred solution of the split measurement control method of the low-voltage intelligent circuit breaker described in the present invention, wherein: the protection board and the measurement module exchange data through a dedicated communication interface, and design a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin and a communication clock pin to achieve high-speed data transmission, including:

[0024] When the measuring module is not correctly connected to the protection board, that is, the communication connection is not established between the measuring module and the protection board, the levels of the communication control selection pin, the unidirectional data transmission pin, the bidirectional data interaction pin and the communication clock pin are all normally high, and data transmission is interrupted;

[0025] When the measurement module is correctly connected to the protection board, that is, a communication connection is established between the measurement module and the protection board, the measurement module actively controls the level of the communication control selection pin in the internal interface to a low level, and starts the unidirectional data sending pin, so as to use the communication control selection pin and the unidirectional data sending pin to obtain the electrical data sent by the protection board, wherein the data transmission direction of the unidirectional data sending pin is fixed from the protection board to the measurement module, and the type of data sent by each communication control selection pin is fixed; the bidirectional data interaction pin sends the electrical data collected by the protection board to the measurement module on the one hand, and receives the control command sent by the measurement module to the protection board on the other hand, wherein the data length sent and received by the bidirectional data interaction pin is consistent with the data length sent by the unidirectional data sending pin; all the above communication processes are synchronously controlled by the communication clock pin.

[0026] As a preferred solution of the split measurement control method of the low-voltage intelligent circuit breaker described in the present invention, the measurement module analyzes the data sent by the protection board after receiving it, and sends a control instruction to the protection board. After each sending cycle, the protection board is notified by operating the communication control selection pin to manage the communication cycle, including:

[0027] The protection board periodically sends data packets carrying flags of different data types to the measurement module. After completing the sending of a data packet, the measurement module controls the level of the communication control selection pin to a high level, and the levels of other pins remain unchanged. Taking this as a signal, the measurement module informs the protection board of the end of the current sending cycle through corresponding data transmission;

[0028] In each sending cycle, the measurement module will receive the electrical data sent by the protection board and another type of reporting information to form a complete data packet. The measurement module will perform data analysis after receiving the complete data packet. Based on the results of the data analysis, if there is a situation where a control command is executed, the measurement module will convey the control instruction to the protection board through the corresponding data transmission process in the next sending cycle to achieve precise control of the circuit breaker operation.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: ① The present invention improves the flexibility and maintainability of the system by dividing the control module into a protection board and a measurement module, and adopts a pluggable measurement module, which is convenient for upgrading and replacing components; ② The measurement module has a built-in high-performance MCU and uses an embedded platform real-time operating system for task management, which can perform advanced data analysis and calculation, thereby improving the overall intelligence level of the circuit breaker; ③ The present invention realizes high-speed and secure data exchange through a dedicated communication interface and communication pin design and a dedicated verification algorithm, thereby improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the overall structure of a split system of a low-voltage intelligent circuit breaker according to an embodiment of the present invention;

[0032] Figure 2 A software system design diagram of a split system and a measurement and control method of a low-voltage intelligent circuit breaker according to an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the data structure of a split system and a measurement and control method of a low-voltage intelligent circuit breaker according to an embodiment of the present invention;

[0034] Figure 4 This is a communication timing diagram of a split system and a measurement and control method of a low-voltage intelligent circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0036] Example 1

[0037] Reference Figure 1 , Figure 2 As an embodiment of the present invention, a split system of a low-voltage intelligent circuit breaker is provided, which specifically includes:

[0038] The protection board 100 is used to collect electrical data and send it to the measurement module 200, and receive the control signal fed back by the measurement module 200, and perform electrical protection calculation and low-voltage intelligent circuit breaker action control in real time according to the control signal;

[0039] The measurement module 200 is used to receive the electrical data sent by the protection board 100, perform advanced data analysis and calculation on the electrical data, and feed back the analyzed control signal to the protection board 100, and is also used for external data communication;

[0040] In the embodiment of the present application, the protection board 100 includes a microcontroller unit MCU101, an analog-to-digital converter ADC102, a voltage transformer 103, a current transformer 104, an electrically erasable programmable read-only memory EEPROM 105, a temperature sensor 106, an internal interface 300, and a switch interface 400;

[0041] Specifically, the microcontroller unit 101 is connected to three analog-to-digital converters 102 via an SPI interface, the microcontroller unit 101 is connected to an electrically erasable programmable read-only memory 105 via an I2C interface, the microcontroller unit 101 is connected to an internal interface 300 via a TTL serial communication port and a general-purpose input / output port, the microcontroller unit 101 is connected to a switch interface 400 via a general-purpose input / output port, the three analog-to-digital converters 102 are respectively connected to a voltage transformer 103, a current transformer 104, and a temperature sensor 106, and the electrically erasable programmable read-only memory 105 is connected to the internal interface 300 via an I2C interface;

[0042] Specifically, the internal interface 300 is connected to the internal interface 500 of the measurement module 200 through a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin and a communication clock pin to send electrical data and receive feedback control signals. The switch interface 400 is used to collect electrical data externally, and the micro control unit 101 is used to perform real-time electrical protection operations and low-voltage intelligent circuit breaker action control.

[0043] In the embodiment of the present application, the micro control unit 101 is used to perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time, and realizes internal communication function, electrical protection function, gate position state sensing function, and tripping state sensing function by performing electrical protection calculations and low-voltage intelligent circuit breaker action control in real time. Among them, the electrical protection function includes overvoltage protection, undervoltage protection, three-stage current protection, and leakage protection.

[0044] It should be noted that the internal interface 300 is used for the communication connection between the protection board 100 and the measurement module 200. The communication data includes: voltage, current, opening and closing control, and parameter configuration instructions. The protection board 100 has two power supply modes: power is taken from the current protection transformer or the built-in AC / DC power supply;

[0045] It should be noted that the protection board is fixedly installed inside the circuit breaker and is not designed to be removed without disassembling the circuit breaker casing. The board integrates a microcontroller unit (MCU) and provides the basic electrical protection functions required for low-voltage intelligent circuit breakers, including but not limited to three-stage current protection and over-temperature protection. To ensure the reliability of the system, the protection board is designed with two power supply methods: one is to draw power through the current protection transformer to ensure that the basic protection function can be maintained when the measuring unit is damaged or disassembled; the other is to achieve normal power conversion from AC to DC through the built-in AC / DC power module.

[0046] Further, the measurement module 200 includes a high-performance microcontroller unit 201, an internal interface 500, an external interface 600, a topology unit 202, a metering IC unit 203, a broadband carrier communication module 204, a Bluetooth module 205, an AC / DC module 206, a ferroelectric memory 207, a clock module 208, and a flash memory 209;

[0047] Specifically, the high-performance microcontroller unit 201 is connected to the topology unit 202, the broadband carrier communication module 204, and the Bluetooth module 205 through three TTL serial communication ports, and is connected to the metering IC unit 203 and the flash memory 209 through the SPI interface. The high-performance microcontroller unit 201 is connected to the ferroelectric memory 207 and the clock module 208 through the I2C interface. The high-performance microcontroller unit 201 is also connected to the AC / DC module 206. The high-performance microcontroller unit 201 is used to perform advanced data analysis and calculations on electrical data;

[0048] Specifically, the internal interface 500 is connected to the high-performance microcontroller unit 201 through the general input / output port, the TTL serial communication port, and the I2C interface, and is also connected to the metering IC unit 203, the broadband carrier communication module 204, and the AC / DC module 206, respectively. The internal interface 500 is connected to the internal interface 300 of the protection board 100 through the communication control selection pin, the unidirectional data transmission pin, the bidirectional data interaction pin, and the communication clock pin to receive electrical data and feedback control signals;

[0049] Specifically, the external interface 600 is connected to the high-performance micro control unit 201 through two TTL serial communication ports and one general input / output port, and the external interface 600 is used for external data communication.

[0050] In the embodiment of the present application, the high-performance microcontroller unit 201 is used to perform advanced data analysis and calculation on electrical data, and realizes the electric energy metering function, electrical protection and topology identification function through advanced data analysis and calculation, wherein the electrical protection function includes voltage loss protection, current loss protection, reverse flow protection, power factor protection, three-phase current unbalance protection, phase loss protection, frequency protection, and over-temperature protection; the internal interface 500 is used to protect the communication connection between the board 100 and the measurement module 200, and the communication signals include: voltage, metering current, communication serial port, trip control, opening and closing signal, and body information storage; the external interface 600 includes a remote signal interface, an RS485 serial communication port, and a power supply port;

[0051] In the embodiment of the present application, the measurement module 200 is in the form of a pluggable component, runs an embedded platform real-time operating system to establish multiple tasks, and performs time-sharing processing through a task management mechanism.

[0052] It should be noted that the measurement module is a pluggable component with a high-performance built-in MCU, which is responsible for realizing the communication, metering, meter reading, reporting and topology functions of the low-voltage intelligent circuit breaker. The measurement module runs an embedded platform real-time operating system (RTOS), builds 8 tasks, and uses the task management mechanism of RTOS for time-sharing processing to optimize the responsiveness and stability of the software system. The software system design is as follows Figure 2 shown.

[0053] In the embodiment of the present application, a split design is adopted between the protection board and the measurement module. The protection board is responsible for basic data acquisition, and the measurement module performs advanced data analysis and calculations. The protection board and the measurement module exchange data through a dedicated communication interface to ensure the high-speed and secure characteristics of data transmission. The measurement module acts as a communication host, and the protection board acts as a slave. The host controls the communication frequency to realize status reporting and information sending. The protection board sends basic acquisition data to the measurement module, and the measurement module sends control signals to the protection board, and data accuracy is guaranteed when the two interact.

[0054] Through the above-mentioned setting mode of the split system of the low-voltage intelligent circuit breaker, the beneficial effects of the present invention are:

[0055] ① The present invention improves the flexibility and maintainability of the system by dividing the control module into a protection board and a measurement module, and adopts a pluggable measurement module, which is convenient for upgrading and replacing components; ② The measurement module has a built-in high-performance MCU and uses an embedded platform real-time operating system for task management, which can perform advanced data analysis and calculation, thereby improving the overall intelligence level of the circuit breaker; ③ The present invention realizes high-speed and secure data exchange through a dedicated communication interface, communication pin design and a dedicated verification algorithm, thereby improving the reliability of the system.

[0056] Example 2

[0057] Reference Figure 3 , Figure 4 As an embodiment of the present invention, a split measurement control method for a low-voltage intelligent circuit breaker is provided. The method is applied to the system of embodiment 1 and specifically includes the following steps:

[0058] The protection board collects electrical data and sends it to the measurement module, and receives the control signal fed back by the measurement module, and performs electrical protection calculations and low-voltage intelligent circuit breaker action control in real time according to the control signal;

[0059] The measurement module receives the electrical data sent by the protection board, performs advanced data analysis and calculations on the electrical data, and feeds back the analyzed control signal to the protection board. The measurement module also communicates data externally. In the embodiment of the present application, a split design is adopted between the protection board and the measurement module. The protection board is responsible for basic data acquisition and acts as a slave. The measurement module performs advanced data analysis and calculations and acts as a host. The host controls the communication frequency to realize status reporting and information sending. The protection board and the measurement module exchange data through a dedicated communication interface, and the communication control selection pin, unidirectional data transmission pin, bidirectional data interaction pin and communication clock pin are designed to realize high-speed data transmission.

[0060] The measurement module analyzes the data received from the protection board and sends control instructions to the protection board when necessary. After each transmission cycle, the measurement module notifies the protection board by operating the communication control selection pin to manage the communication cycle.

[0061] It should be noted that the traditional circuit breaker uses a single MCU to process and calculate the collected data, obtain the protection status and action execution. The design lacks the intelligent monitoring and communication capabilities that match the modern power system, and cannot meet the real-time response to complex power flows and diversified user needs. When facing rapidly changing power grid conditions, it is also difficult to achieve fast disconnection and high-reliability communication, which may lead to untimely fault handling in an emergency and increase the risk of power grid operation. Therefore, the split solution adopted by the present invention overcomes the shortcomings of existing circuit breakers in the new type of IoT low-voltage distribution substation, in which the protection board is responsible for basic data collection, while the measurement module performs advanced data analysis and calculations. To achieve data exchange, the protection board sends the collected three-phase voltage, three-phase current, and frequency data on the power supply line to the measurement module synchronously. The measurement module uses the synchronized three-phase voltage and current data to calculate the three-phase active power, reactive power, apparent power, voltage harmonic content, current harmonic content, and combined phase active power, reactive power, apparent power, total voltage harmonic content, and total current harmonic content through accumulation, fast Fourier transform, and integration algorithm, and further calculates the three-phase and total electric energy data through the above data. The control signal for the switch is obtained by using a plurality of composite thresholds, timing, and change rate judgment methods for the calculated data. The measurement module feeds the control signal back to the protection board. When the two interact, not only the accuracy of the data during transmission is guaranteed, but also the characteristics of high speed and safety are required. To this end, the present invention designs a dedicated communication interface between the protection board and the measurement unit for data exchange to ensure efficient communication between modules.

[0062] Further, the communication interface is composed of the following parts: 1 communication control selection pin, 6 unidirectional data transmission pins, 2 bidirectional data interaction pins and 1 communication clock pin;

[0063] Specifically, the functions of the two bidirectional data interaction pins are from the measurement module to the protection board, and from the protection board to the measurement module. The measurement module serves as the communication host, and the protection board serves as the communication slave. The host controls the communication rhythm (it is recommended to communicate >= once per second). The host will periodically poll the slave to obtain status reports and issue acquisition instructions; at the same time, the host can also trigger special communication events, such as querying or configuring protection parameters. For this purpose, a dedicated slave reporting status word is designed. When an event that needs to be reported occurs on the slave side, such as a change in the parameters of the human-machine interaction interface (including voltage, current, residual current protection parameters, communication parameters, date and time, etc.), a protection event or an alarm event, the corresponding status bit will be set.

[0064] Furthermore, the specific communication form is:

[0065] When the measurement module is not correctly connected to the protection board, that is, when the communication connection is not established between the measurement module and the protection board, the levels of the communication control selection pin, the one-way data transmission pin, the two-way data interaction pin and the communication clock pin are all normally high, and data transmission is interrupted;

[0066] When the measurement module is correctly connected to the protection board, that is, when the communication connection is established between the measurement module and the protection board, the measurement module actively controls the level of the communication control selection pin in the internal interface to a low level, and starts 6 unidirectional data transmission pins to obtain the electrical data sent by the protection board using the communication control selection pin and the unidirectional data transmission pin. Among them, the data transmission direction of the 6 unidirectional data transmission pins is fixed to be transmitted from the protection board to the measurement module, and the data type sent by each communication pin is fixed, namely, A phase voltage, B phase voltage, C phase voltage, A phase current, B phase current, and C phase current. Each communication pin sends a signal after the control selection pin is activated. A single-precision floating-point number, which occupies 4 bytes; in the two-way data interaction pin, one is used to protect the board vector measurement module to send a group of additional electrical quantity and state quantity data, each group of data is also 4 bytes, which is consistent with the data length sent by the unidirectional data sending pin. The data structure starts with the data type flag, followed by two bytes of hexadecimal value, arranged in the form of high byte first, and finally a check byte; the other receives the control command sent by the measurement module to the protection board. The data format follows the same structure, that is, it starts with the control type flag, followed by the hexadecimal representation of the control instruction and the check byte. The data structure of the two-way interaction pin is as follows Figure 3 As shown; all the above communication processes are synchronously controlled by the communication clock pin, as shown in Figure 4 shown.

[0067] Furthermore, the communication verification algorithm is:

[0068] The check byte generation algorithm is based on the last 8 bits of the sum of the 24 bytes of data sent by the 6 unidirectional data transmission pins and the 1st, 2nd, and 3rd bytes sent by the bidirectional interactive pins. If the calculated check byte is equal to the 4th check byte in the bidirectional interactive signal, it means that the check is passed and the received data will be used for further analysis and processing; if they are not equal, all the data received this time will be discarded. The check byte generation formula is as follows:

[0069]

[0070] Among them, D represents one-way data, i represents one-way data sequence number, j represents byte sequence number, d represents received two-way interactive data, k represents byte sequence number, d represents 4 For the check byte.

[0071] Furthermore, the protection board periodically sends data packets carrying flags of different data types. After completing the transmission of a data packet containing 4 bytes, the measurement module will activate the communication control selection pin and set its level to high, which serves as a signal to inform the protection board of the end of the current transmission cycle;

[0072] It should be noted that this action marks the end of a communication cycle and triggers the subsequent communication reset preparation. After the level of the communication control selection pin undergoes a high-low-high change, the measurement module should complete at least one complete level flip cycle under the communication clock pin. After that, the data reading operation is started again to ensure the accuracy of data synchronization and the continuity of the communication process.

[0073] Furthermore, in each transmission cycle, the measurement module will receive data including the voltage and current of phase A, phase B, and phase C, as well as another type of reporting information, to form a complete set of data packets. At the same time, the protection board will receive a single control message from the measurement module. The measurement module receives and stores the complete data packet sent by the protection board, and will perform data analysis. Based on the data analysis results, if there is a need to execute a control command, the measurement module will transmit the control instruction to the protection board through the corresponding data transmission pin in the next transmission cycle to achieve precise control of the circuit breaker operation. Through this design, the present invention not only ensures the high speed and accuracy of data transmission, but also enhances the reliability of data transmission through the verification mechanism, meeting the strict requirements of intelligent circuit breakers on communication performance in complex power grid environments.

[0074] From the above, it can be seen that ① the present invention improves the flexibility and maintainability of the system by dividing the control module into a protection board and a measurement module, and adopts a pluggable measurement module, which is convenient for upgrading and replacing components; ② the measurement module has a built-in high-performance MCU, and uses an embedded platform real-time operating system for task management, which can perform advanced data analysis and calculations, thereby improving the overall intelligence level of the circuit breaker; ③ the present invention realizes high-speed and secure data exchange through a dedicated communication interface and communication pin design and a dedicated verification algorithm, thereby improving the reliability of the system.

[0075] This embodiment also provides a computing device, which includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a split measurement and control method for a low-voltage intelligent circuit breaker is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball or a touchpad set on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0076] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method proposed in the above embodiment is implemented.

[0077] The storage medium proposed in this embodiment and the method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0078] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

[0080] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language C++ and process-oriented programming language C language, etc.

[0081] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1The steps for the functions specified in one or more boxes.

[0084] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0085] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A split system of a low voltage intelligent circuit breaker, characterized in that: include: A protection board (100) is used to collect electrical data and send it to a measurement module (200), and receive a control signal fed back by the measurement module (200), and perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time according to the control signal; The measurement module (200) is used to receive the electrical data sent by the protection board (100), perform high-level data analysis and calculation on the electrical data, feed back the analyzed control signal to the protection board (100), and is also used to perform external data communication.

2. The split system of low voltage intelligent circuit breaker according to claim 1, characterized in that: The protection board (100) comprises a micro control unit (101), an analog-to-digital converter (102), a voltage transformer (103), a current transformer (104), an electrically erasable programmable read-only memory (105), a temperature sensor (106), an internal interface (300), and a switch interface (400); The microcontrol unit (101) is connected to the analog-to-digital converter (102) via an SPI interface, the microcontrol unit (101) is connected to the electrically erasable programmable read-only memory (105) via an I2C interface, the microcontrol unit (101) is connected to the internal interface (300) via a TTL serial communication port and a universal input / output port, the microcontrol unit (101) is connected to the switch interface (400) via a universal input / output port, the analog-to-digital converter (102) is respectively connected to the voltage transformer (103), the current transformer (104), and the temperature sensor (106), and the electrically erasable programmable read-only memory (105) is connected to the internal interface (300) via an I2C interface; The internal interface (300) is connected to the internal interface (500) of the measurement module (200) via a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin and a communication clock pin to transmit electrical data and receive feedback control signals; the switch interface (400) is used to collect electrical data externally; and the microcontroller unit (101) is used to perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time.

3. The split system of low voltage intelligent circuit breaker according to claim 2, characterized in that: The micro control unit (101) is used to perform electrical protection calculations and low-voltage intelligent circuit breaker action control in real time, and internal communication function, electrical protection function, gate position state sensing function, and tripping state sensing function are realized by performing electrical protection calculations and low-voltage intelligent circuit breaker action control in real time, wherein the electrical protection function includes overvoltage protection, undervoltage protection, three-stage current protection, and leakage protection.

4. The split system of low voltage intelligent circuit breaker according to claim 1, characterized in that: The measurement module (200) comprises a high-performance microcontroller unit (201), an internal interface (500), an external interface (600), a topology unit (202), a measurement IC unit (203), a broadband carrier communication module (204), a Bluetooth module (205), an AC / DC module (206), a ferroelectric memory (207), a clock module (208), and a flash memory (209); The high-performance microcontroller unit (201) is connected to the topology unit (202), the broadband carrier communication module (204), and the Bluetooth module (205) respectively through a TTL serial communication port; the high-performance microcontroller unit (201) is connected to the metering IC unit (203) and the flash memory (209) respectively through an SPI interface; the high-performance microcontroller unit (201) is connected to the ferroelectric memory (207) and the clock module (208) through an I2C interface; the high-performance microcontroller unit (201) is also connected to the AC / DC module (206); and the high-performance microcontroller unit (201) is used to perform advanced data analysis and calculation on the electrical data; The internal interface (500) is connected to the high-performance microcontroller unit (201) through a universal input / output port, a TTL serial communication port, and an I2C interface respectively. The internal interface (500) is also connected to the metering IC unit (203), the broadband carrier communication module (204), and the AC / DC module (206) respectively. The internal interface (500) is connected to the internal interface (300) of the protection board (100) through a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin, and a communication clock pin to receive electrical data and feedback control signals. The external interface (600) is connected to the high-performance micro control unit (201) via a TTL serial communication port and a general input / output port, and the external interface (600) is used for external data communication.

5. The split system of low voltage intelligent circuit breaker according to claim 4, characterized in that: The high-performance microcontroller unit (201) is used to perform high-level data analysis and calculation on the electrical data, and realizes electric energy metering function, electrical protection function and topology identification function through high-level data analysis and calculation, wherein the electrical protection function includes voltage loss protection, current loss protection, reverse flow protection, power factor protection, three-phase current imbalance protection, phase failure protection, frequency protection and over-temperature protection.

6. The split system of low voltage intelligent circuit breaker according to claim 5, characterized in that: The external interface (600) comprises a remote signaling interface, an RS485 serial communication port, and a power supply port.

7. A measurement and control method for a split system using a low-voltage intelligent circuit breaker as claimed in any one of claims 1 to 6, characterized in that: include: The protection board collects electrical data and sends it to the measurement module, and receives the control signal fed back by the measurement module, and performs electrical protection calculation and low-voltage intelligent circuit breaker action control in real time according to the control signal; The measuring module receives the electrical data sent by the protection board, performs advanced data analysis and calculation on the electrical data, and feeds back the analyzed control signal to the protection board. The measuring module also performs data communication externally.

8. The split measurement and control method for a low-voltage intelligent circuit breaker according to claim 7, characterized in that: The protection board and the measurement module adopt a split design. The protection board is responsible for basic data acquisition and acts as a slave. The measurement module performs advanced data analysis and calculations and acts as a host. The host controls the communication frequency to realize status reporting and information sending.

9. The split measurement and control method for a low-voltage intelligent circuit breaker according to claim 7, characterized in that: The protection board and the measurement module exchange data through a dedicated communication interface, and design a communication control selection pin, a unidirectional data transmission pin, a bidirectional data interaction pin and a communication clock pin to achieve high-speed data transmission, including: When the measuring module is not correctly connected to the protection board, that is, the communication connection is not established between the measuring module and the protection board, the levels of the communication control selection pin, the unidirectional data transmission pin, the bidirectional data interaction pin and the communication clock pin are all normally high, and data transmission is interrupted; When the measurement module is correctly connected to the protection board, that is, a communication connection is established between the measurement module and the protection board, the measurement module actively controls the level of the communication control selection pin in the internal interface to a low level, and starts the unidirectional data sending pin, so as to use the communication control selection pin and the unidirectional data sending pin to obtain the electrical data sent by the protection board, wherein the data transmission direction of the unidirectional data sending pin is fixed from the protection board to the measurement module, and the type of data sent by each communication control selection pin is fixed; the bidirectional data interaction pin sends the electrical data collected by the protection board to the measurement module on the one hand, and receives the control command sent by the measurement module to the protection board on the other hand, wherein the data length sent and received by the bidirectional data interaction pin is consistent with the data length sent by the unidirectional data sending pin; all the above communication processes are synchronously controlled by the communication clock pin.

10. The split measurement and control method for a low voltage intelligent circuit breaker according to claim 8, characterized in that: The measurement module analyzes the data received from the protection board and sends a control instruction to the protection board. After each transmission cycle, the measurement module notifies the protection board by operating the communication control selection pin to manage the communication cycle, including: The protection board periodically sends data packets carrying flags of different data types to the measurement module. After completing the sending of a data packet, the measurement module controls the level of the communication control selection pin to a high level, and the levels of other pins remain unchanged. Taking this as a signal, the measurement module informs the protection board of the end of the current sending cycle through corresponding data transmission; In each sending cycle, the measurement module will receive the electrical data sent by the protection board and another type of reporting information to form a complete data packet. The measurement module will perform data analysis after receiving the complete data packet. Based on the results of the data analysis, if there is a situation where a control command is executed, the measurement module will convey the control instruction to the protection board through the corresponding data transmission process in the next sending cycle to achieve precise control of the circuit breaker operation.

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