WO2023197614A1

WO2023197614A1 - Intelligent low-voltage circuit breaker provided with double-core mode

Info

Publication number: WO2023197614A1
Application number: PCT/CN2022/134936
Authority: WO
Inventors: 马晓昆; 张传远; 梁薇; 薛莉; 高振伟; 王光磊; 王丹丹; 钱占奎; 史文辉
Original assignee: 北京国电通网络技术有限公司; 国网信息通信产业集团有限公司
Priority date: 2022-04-11
Filing date: 2022-11-29
Publication date: 2023-10-19
Also published as: CN114726097B; CN114726097A

Abstract

Embodiments of the present invention discloses an intelligent low-voltage circuit breaker device provided with a double-core mode. The intelligent low-voltage circuit breaker device provided with the dual-core mode comprises: a management unit, a protection unit, a signal acquisition unit and a power supply system. The management unit comprises a management chip, a communication interface module, a control interface module, an indication interaction module, a topology recognition module and a clock module. The protection unit comprises a protection chip, a protection interface module, a temperature measurement module and a memory module. The signal acquisition unit comprises a voltage measurement module and a current measurement module. The power supply system comprises a self-generated power supply and an auxiliary power supply. The management unit is in communication connection with the protection unit. The signal acquisition unit is respectively connected to the management unit and the protection unit via circuits. The self-generated power supply supplies power to the protection unit, and the auxiliary power supply supplies power to the management unit and the protection unit. The embodiments enables timely protection of the circuit breaker even when the management unit fails.

Description

Dual-core mode low-voltage intelligent circuit breaker device

Technical field

Embodiments of the present disclosure relate to the field of circuits, and in particular to a dual-core mode low-voltage intelligent circuit breaker device.

Background technique

With the digital transformation of the power grid, the digital transformation work in Taiwan District continues to deepen, which puts forward higher requirements for the intelligence of various terminal equipment in Taiwan District. As a key terminal equipment in low-voltage Taiwan areas, circuit breakers play an important role in the lean management of Taiwan areas and the improvement of low-voltage distribution network power supply service capabilities. Proper deployment of low-voltage smart circuit breakers is a key link to achieve in-depth sensing in Taiwan areas, improve user experience, and optimize operations. It is also an important means to build the power distribution Internet of Things. Currently, the usual method for managing and controlling circuit breakers is to use a single processor mode to manage and control circuit breakers and identify faults.

However, the following technical problems usually arise when using the above approach:

First, when the single processor fails (power outage or damage), the circuit breaker cannot be protected in time;

Second, when a single processor fails (power outage or damage), the cause of the processor failure cannot be determined in time, resulting in the inability to protect the circuit breaker in time, which may easily cause damage to the circuit breaker.

Contents of the invention

This Summary is provided to introduce in simplified form concepts that are later described in detail in the Detailed Description. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solutions, nor is it intended to be used to limit the scope of the claimed technical solutions.

Some embodiments of the present disclosure propose a dual-core mode low-voltage intelligent circuit breaker device to solve one or more of the technical problems mentioned in the background art section above.

Some embodiments of the present disclosure provide a dual-core mode low-voltage intelligent circuit breaker device. The dual-core mode low-voltage intelligent circuit breaker device includes: a management unit, a protection unit, a signal acquisition unit and a power supply system, wherein the above-mentioned management unit , including: management chip, communication interface module, control interface module, instruction interaction module, topology identification module and clock module; the above-mentioned protection unit includes: protection chip, protection interface module, temperature measurement module and storage module; the above-mentioned signal acquisition unit, It includes: a voltage measurement module and a current measurement module; the above-mentioned power supply system includes: a self-generated power supply and an auxiliary power supply; the above-mentioned management unit is communicatively connected with the above-mentioned protection unit; the above-mentioned signal acquisition unit is respectively connected with the above-mentioned management unit and the above-mentioned protection unit through circuits; the above-mentioned The self-generated power supply supplies power to the above-mentioned protection unit, and the above-mentioned auxiliary power supply supplies power to the above-mentioned management unit and the above-mentioned protection unit.

Optionally, the above-mentioned management chip includes: a metering chip and a main control chip; and the above-mentioned metering chip is communicatively connected with the above-mentioned main control chip; the above-mentioned metering chip is configured to: receive the voltage signal and current signal collected by the above-mentioned signal acquisition unit, and according to The received voltage signal and current signal are analyzed by the circuit.

Optionally, the above-mentioned management chip includes: a read-only memory and a flash memory; both the above-mentioned read-only memory and the above-mentioned flash memory are used to record the data processed by the above-mentioned management unit.

Optionally, the above power supply system further includes: a backup power supply; and the above backup power supply is configured to: supply power to the above management unit, the above protection unit and the above signal collection unit when the power of the above auxiliary power supply is insufficient.

Optionally, the voltage measurement module includes a voltage measurement transformer; the current measurement module includes a current measurement transformer and a current protection transformer.

Optionally, the voltage measuring transformer is used to collect voltage signals; the current measuring transformer and the current protection transformer are used to collect current signals respectively.

Optionally, the above-mentioned signal acquisition unit sends the collected voltage signal and current signal to the above-mentioned management unit through a circuit connected to the above-mentioned management unit; the above-mentioned signal acquisition unit sends the collected current signal through a circuit connected to the above-mentioned protection unit. to the protection unit mentioned above.

Optionally, the above-mentioned protection unit is used to disconnect the circuit connection of the above-mentioned circuit breaker when abnormal parameters are monitored; the above-mentioned protection unit is also used to send the collected circuit information of the above-mentioned circuit breaker to the above-mentioned management unit; the above-mentioned management unit Used to send various parameters for protecting the above-mentioned circuit breaker to the above-mentioned protection unit.

Optionally, the installation form of the above-mentioned management unit, the above-mentioned protection unit, and the above-mentioned signal acquisition unit is all pluggable.

The above-mentioned embodiments of the present disclosure have the following beneficial effects: through the dual-core mode low-voltage intelligent circuit breaker device of some embodiments of the present disclosure, the circuit breaker can be protected in time when a single processor fails. Specifically, the reason why the circuit breaker cannot be protected in time is that when the single processor fails (power outage or damage), the circuit breaker cannot be protected in time. Based on this, the dual-core mode low-voltage intelligent circuit breaker device of some embodiments of the present disclosure separates the management function and the protection function, and designs a management unit and a protection unit to manage and control the circuit breaker respectively. First, the designed management unit includes: management chip, communication interface module, control interface module, instruction interaction module, topology identification module and clock module. Therefore, the management unit can be used to complete operations such as data collection, data management, communication management, input and output control, and data calculation of the circuit breaker. Then, the designed protection unit can include a protection chip, a protection interface module, a temperature measurement module and a storage module. The above-mentioned management unit is communicatively connected with the above-mentioned protection unit. As a result, the management unit and the protection unit can communicate with each other and realize the mutual transmission of protection events, wave recording data, real-time data, parameters and other information. In addition, the self-generated power supply and auxiliary power supply included in the set power system are used to supply power to the management unit and protection unit respectively, so that when the management unit (single processor) fails, the protection unit can still be used to realize current protection of the circuit breaker. Functions, including long delay protection, short delay protection, instantaneous protection and leakage protection.

Description of the drawings

The above and other features, advantages, and aspects of various embodiments of the present disclosure will become more apparent with reference to the following detailed description taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and elements are not necessarily drawn to scale.

Figure 1 is a schematic structural diagram of a dual-core mode low-voltage intelligent circuit breaker device according to some embodiments of the present disclosure;

Figure 2 is a schematic structural design diagram of an embodiment of a signal acquisition unit according to the present disclosure;

Figure 3 is a schematic diagram of a workflow design of an embodiment of a power supply system according to the present disclosure;

Figure 4 is a schematic structural design diagram of an embodiment of a management chip according to the present disclosure.

Detailed ways

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of the present disclosure.

It should also be noted that, for convenience of description, only the parts related to the invention are shown in the drawings. The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.

It should be noted that concepts such as “first” and “second” mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units. Or interdependence.

It should be noted that the modifications of "one" and "plurality" mentioned in this disclosure are illustrative and not restrictive. Those skilled in the art will understand that unless the context clearly indicates otherwise, it should be understood as "one or Multiple”.

The names of messages or information exchanged between multiple devices in the embodiments of the present disclosure are for illustrative purposes only and are not used to limit the scope of these messages or information.

The present disclosure will be described in detail below in conjunction with embodiments with reference to the accompanying drawings.

Please refer to FIG. 1 , which shows a schematic structural diagram of an embodiment of a dual-core mode low-voltage intelligent circuit breaker device provided by the present disclosure. As shown in FIG. 1 , the dual-core mode low-voltage intelligent circuit breaker device provided by the present disclosure may include: a management unit 1 , a protection unit 2 , a signal acquisition unit 3 and a power supply system 4 .

In some embodiments, the above-mentioned management unit 1 includes: a management chip, a communication interface module, a control interface module, an instruction interaction module, a topology identification module and a clock module. Here, the management chip can be the SCMB9005 chip. Here, the communication interface module may refer to a communication interface, which may include an uplink communication interface and a downlink communication interface. Here, the control interface module may refer to a host control interface, an interface used to control the opening and closing operations of the circuit breaker. Here, the indication interaction module may refer to LED indication and key interaction modules (for example, LED indicators, keys). Here, the topology identification module may refer to a chip with topology identification, which can perform topology identification on received voltage signals and current signals. Here, the clock module may refer to the R8025AC clock chip, which can realize the clock summoning and timing functions of the circuit breaker. In practice, the above-mentioned management unit 1 is also designed with 10 to 13 general-purpose input/output port (GPIO) functions. Here, the functions of 10 to 13 general input/output ports (GPIO) are designed as follows: 1. The button input module (GPIO) is designed with "closing" and "opening" control operation buttons, as well as "reclosing" and "Bluetooth" Switch-on and off-function buttons, etc., meet the functional requirements for human-computer interaction on the circuit breaker; 2. LED indicator module design system operating lights, warning lights, fault lights, etc., which can intuitively observe the current equipment status; 3. Design the opening and closing output Control function and input monitoring of the opening and closing status, so that the management chip can directly control the opening and closing of the circuit breaker and confirm whether the opening and closing operation is successful. In practice, the above-mentioned management unit 1 is also designed with 1 bus (I2C), 2 asynchronous receive and transmit transmitters (USART), and 3 asynchronous receive and transmit transmitters. Among them, 1 bus connects the clock module R8025AC to realize the clock summoning and timing functions of the circuit breaker. The 2-way asynchronous receiving and transmitting transmitter is designed to have TTL levels and is directly connected to the protection unit 2 for communication on the hardware and is reserved as a debugging serial port for program development. The 3-way asynchronous receiving and receiving transmitters are respectively connected to the pluggable single-phase high-speed power line carrier module, 485 communication chip and Bluetooth communication module that comply with the relevant standards and specifications of the power grid, meeting the functions of remote communication and remote upgrade of the circuit breaker with the integrated terminal through the carrier module. requirements, as well as the functional requirements for local maintenance and local upgrades through the 485 communication chip and Bluetooth communication module.

In some embodiments, the above-mentioned protection unit 2 includes: a protection chip, a protection interface module, a temperature measurement module and a storage module. Here, the protection chip can be an STM32F103 chip. Here, the protection interface module may refer to the host control interface of the protection unit 2, which is an interface used to control the opening and closing operations of the circuit breaker. Here, the temperature measurement module may refer to a chip that measures the temperature of the circuit breaker. For example, the temperature measurement module can be a single bus temperature measurement chip DS18B20. Thus, the self-diagnosis function and temperature protection function of the circuit breaker's controller over-temperature, busbar or contact temperature monitoring can be realized. The storage module may refer to a memory used to store various parameters of the preset protection circuit breaker. Here, the storage module may be an EEPROM memory. Therefore, it meets the needs of the storage function of circuit breaker parameters and protection settings, and the self-diagnosis function of memory fault identification.

During actual operation, the signal sampling unit 3 can input the current signal into the analog-to-digital converter of the protection unit 2; the protection unit 2 drives the opening and closing operation of the circuit breaker controlled by the actuator through the output and monitors the opening and closing status. monitor.

The relevant content of the protection unit 2 is an inventive point of the present disclosure, thereby solving the technical problem 2 mentioned in the background art: "When the processor fails (power outage or damage), the cause of the processor failure cannot be determined in time, resulting in Failure to protect the circuit breaker in time may easily cause damage to the circuit breaker." The reason why the circuit breaker cannot be protected in time and the circuit breaker is easily damaged is that when the processor fails (power outage or damage), the cause of the processor failure cannot be determined in time, resulting in the inability to protect the circuit breaker in time. It is easy to cause damage to the circuit breaker. If the above factors are solved, the damage of the circuit breaker can be reduced. In order to achieve this effect, the present disclosure uses the set protection unit to promptly monitor the line status of the circuit breaker through the voltage sampling circuit, current measurement transformer and current protection transformer when the management unit (processor) fails to ensure that When a circuit breaker fails, timely monitoring is carried out to form current protection and temperature protection for the circuit breaker. Such as long delay protection, short delay protection, instantaneous protection and leakage protection, etc. Thus, the stability and reliability of the circuit breaker are improved.

As shown in Figure 2, in some embodiments, the above-mentioned signal acquisition unit 3 includes: a voltage measurement module and a current measurement module. Here, the voltage measurement module may include a voltage sampling circuit and a voltage measurement transformer. Here, the current measurement module may include a current sampling circuit, a current measurement transformer, and a current protection transformer. Here, a voltage measuring transformer is used to collect the voltage signal on the circuit breaker line. Both current measuring transformers and current protection transformers are used to collect current signals on circuit breaker lines. Here, the current signal collected by the current measuring transformer is sent to the management unit 1 . The current signal collected by the current protection transformer is sent to the protection unit 2. In practice, the voltage measuring transformer described above is used to collect voltage signals. The above-mentioned current measuring transformer and the above-mentioned current protection transformer are respectively used to collect current signals.

Therefore, setting a unique transformer (current protection transformer) for the protection unit 2 can prevent the protection unit 2 from being affected by other parts of the circuit breaker and can operate independently from the management unit 1. Even if the management unit 1 fails, the protection Unit 2 can still protect the circuit breaker.

Optionally, the above-mentioned signal acquisition unit 3 sends the collected voltage signal and current signal to the above-mentioned management unit 1 through a circuit connected to the above-mentioned management unit 1 .

Optionally, the above-mentioned signal acquisition unit 3 sends the collected current signal to the above-mentioned protection unit 2 through a circuit connected to the above-mentioned protection unit 2 .

Optionally, the above protection unit 2 is used to disconnect the circuit breaker when abnormal parameters are detected. In practice, when the protection unit 2 detects abnormal parameters (for example, the temperature measuring device detects that the temperature of the circuit breaker is greater than a preset temperature threshold), it can control the opening and closing of the circuit breaker. Here, abnormal parameters may refer to abnormal parameters when the circuit breaker is operating, which may include but are not limited to: abnormal temperature values (the temperature is not within the specified range), abnormal voltage values (the voltage is not within the specified range), abnormal current values (the current is not within the specified range) within the range).

Optionally, the above-mentioned protection unit 2 is also used to send the collected circuit information of the above-mentioned circuit breaker to the above-mentioned management unit 1 . Here, the circuit information may refer to monitored abnormal parameters.

Optionally, the above-mentioned management unit 1 is used to send various parameters for protecting the above-mentioned circuit breaker to the above-mentioned protection unit 2 . Here, each parameter for protecting the above-mentioned circuit breaker may refer to the operating threshold of each line and module when the circuit breaker is in operation. For example, various parameters for protecting the above-mentioned circuit breaker may include but are not limited to: temperature threshold (maximum operating temperature of the circuit breaker), current threshold (maximum current), voltage threshold (maximum voltage), etc.

Therefore, it is convenient for the management unit 1 to interact with the external maintenance terminal to notify the maintenance personnel to perform maintenance on the circuit breaker. Finally, the management unit 1 can send various parameters for protecting the circuit breaker to the protection unit 2 . Thus, mutual transmission of information such as protection events and parameters can be achieved.

In some embodiments, the above-mentioned power supply system 4 includes: self-generated power supply and auxiliary power supply. The self-generated power supply supplies power to the protection unit 2 , and the auxiliary power supply supplies power to the management unit 1 and the protection unit 2 . Optionally, the power supply system 4 also includes a backup power supply. Wherein, the backup power supply is configured to supply power to the management unit 1 and the protection unit 2 when the auxiliary power supply is insufficient.

As shown in Figure 3, the designed work flow chart of the power supply system 4, the above-mentioned self-generated power supply supports current power supply to supply power to the above-mentioned protection unit 2. That is, the above-mentioned protection unit 2 inductively draws power from the above-mentioned self-generated power supply through the current taking transformer (the self-generated power source draws power inductively from the alternating current in the protection unit 2 through the current taking transformer). Here, DC12V in Figure 3 means direct current 12V. AC/DC means AC input/DC output. DC/DC means converting a fixed DC voltage into a variable DC voltage.

As shown in Figure 3, the above-mentioned auxiliary power supply supplies power to the management unit 1 and the protection unit 2 at the same time. In addition, the auxiliary power supply also needs to be responsible for charging the backup power supply during normal operation.

As shown in Figure 3, when the power of the above-mentioned auxiliary power supply is insufficient, the above-mentioned backup power supply supplies power to the circuit breaker. That is, when the auxiliary power supply is insufficient, the backup power supply supplies power to the management unit 1 and the protection unit 2 . The above backup power supply can be a supercapacitor.

Therefore, when the auxiliary power supply is insufficient or disappears, the backup power supply can ensure that the system's power data and power outage events before the power outage are preserved and not lost.

In some embodiments, the above-mentioned management unit 1 is communicatively connected with the above-mentioned protection unit 2; the above-mentioned signal collection unit 3 is connected with the above-mentioned management unit 1 and the above-mentioned protection unit 2 respectively through circuits.

In some embodiments, the installation form of the above-mentioned management unit 1, protection unit 2, and signal acquisition unit 3 is all pluggable. That is, the management unit 1, the protection unit 2, and the signal acquisition unit 3 can be replaced at any time. As a result, the maintenance of the circuit breaker can be made more convenient and the service life of the circuit breaker can be extended.

Continuing to refer to FIG. 4 , which shows a schematic structural design diagram of one embodiment of the management chip of the dual-core mode low-voltage intelligent circuit breaker device provided by the present disclosure.

The management chip 101 in this embodiment includes a metering chip and a main control chip. The above-mentioned metering chip is communicatively connected with the above-mentioned main control chip. The above-mentioned metering chip is configured to: receive the voltage signal and current signal collected by the above-mentioned signal acquisition unit 3, and perform circuit analysis based on the received voltage signal and current signal. Here, the metering chip may be the SC1186E chip. Here, the main control chip can be an SCM402F chip. Here, circuit analysis may refer to circuit analysis and line loss analysis of overvoltage, undervoltage, phase loss, etc. based on voltage signals and current signals.

The management chip 101 in this embodiment includes read-only memory and flash memory. The above-mentioned read-only memory and the above-mentioned flash memory are both used to record the data processed by the above-mentioned management unit. Here, read-only memory (EEPROM) and flash memory (FLASH) can be used as the program and data storage space of the management unit 1. Here, read-only memory (EEPROM) and flash memory (FLASH) can realize event recording of protection event records, power event records, and parameter change event records of the management unit 1 .

The above-mentioned embodiments of the present disclosure have the following beneficial effects: the management chip 101 realizes data collection, data management, communication management, and non-current protection functions (such as overvoltage, undervoltage, phase loss, reclosing, etc.); in addition, by setting A certain dedicated communication interface (2-way asynchronous receiving and receiving transmitter) is communicated with the protection unit 2, realizing collaboration with the protection unit 2. It can be directly connected in hardware and can communicate directly without level conversion. Circuit analysis and line loss analysis can be achieved using metering chips. Thus, the mutual transmission of information on protection events, wave recording data (voltage signals and current signals), and parameters is realized.

The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles applied. Persons skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to technical solutions composed of specific combinations of the above technical features, and should also cover the above-mentioned technical solutions without departing from the above-mentioned inventive concept. Other technical solutions formed by any combination of technical features or their equivalent features. For example, a technical solution is formed by replacing the above features with technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to).

Claims

A dual-core mode low-voltage intelligent circuit breaker device, including: a management unit, a protection unit, a signal acquisition unit and a power supply system, wherein,

The management unit includes: a management chip, a communication interface module, a control interface module, an instruction interaction module, a topology identification module and a clock module;

The protection unit includes: a protection chip, a protection interface module, a temperature measurement module and a storage module;

The signal acquisition unit includes: a voltage measurement module and a current measurement module;

The power supply system includes: self-generated power supply and auxiliary power supply;

The management unit is communicatively connected to the protection unit; the signal acquisition unit is connected to the management unit and the protection unit respectively through circuits;

The self-generated power supply supplies power to the protection unit, and the auxiliary power supply supplies power to the management unit and the protection unit.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 1, wherein the management chip includes: a metering chip and a main control chip; and

The metering chip is communicatively connected to the main control chip;

The metering chip is configured to: receive the voltage signal and current signal collected by the signal acquisition unit, and perform circuit analysis based on the received voltage signal and current signal.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 1, wherein the management chip includes: a read-only memory and a flash memory; both the read-only memory and the flash memory are used to record the management unit Processed data.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 1, wherein the power supply system further includes: a backup power supply; and

The backup power supply is configured to: supply power to the management unit, the protection unit and the signal collection unit when the auxiliary power supply is insufficient.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 1, wherein the voltage measurement module includes a voltage measurement transformer; the current measurement module includes a current measurement transformer and a current protection transformer.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 5, wherein the voltage measuring transformer is used to collect voltage signals; the current measuring transformer and the current protection transformer are respectively used to collect current signals.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 6, wherein the signal acquisition unit sends the collected voltage signal and current signal to the management unit through a circuit connected to the management unit;

The signal acquisition unit sends the collected current signal to the protection unit through a circuit connected to the protection unit.
The dual-core mode low-voltage intelligent circuit breaker device according to claim 1, wherein the protection unit is used to disconnect the circuit breaker when abnormal parameters are monitored;

The protection unit is also configured to send the collected circuit information of the circuit breaker to the management unit;

The management unit is used to send various parameters for protecting the circuit breaker to the protection unit.
The dual-core mode low-voltage intelligent circuit breaker device according to any one of claims 1 to 8, wherein the installation form of the management unit, the protection unit, and the signal acquisition unit is all pluggable.