Circuit breaker intelligent terminal protection action detection system based on wireless transmission

Abstract

The utility model discloses a circuit breaker intelligent terminal protection action detection system based on wireless transmission for solving the problem that the action export signal cannot be directly measured because the intelligent terminal is located in the switch yard and protection verification is carried out in the control room in the intelligent substation. The system comprises a host computer transmission module deployed on the site and a slave computer receiving module located in the control room. The host computer collects the tripping export voltage signal through high-voltage optical coupling, generates an action event with a time stamp through MCU / FPGA after photoelectric isolation and level conversion, and sends it through LoRa wireless mode. The slave computer receives it and restores it into a DO switch signal to input into a digital relay protection tester, realizing accurate measurement of the tripping action time. The system realizes remote, real-time and cable-free capture of the tripping signal, fills the technical gap of intelligent station protection dynamic performance verification, and improves the safety and efficiency of power grid operation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of power detection technology, and in particular to a circuit breaker intelligent terminal protection action detection system based on wireless transmission. Background Technology

[0002] In current smart substation operation and maintenance, smart terminals are mostly located in outdoor switchyards, while protection device calibration must be performed in the control room. This leads to problems such as the inability to directly measure action time and verify the status of output contacts. Existing technologies rely on manual back-and-forth testing or indirect inference, which is inefficient and fails to identify the risk of failure to operate / false operation caused by incorrect configuration of output contacts.

[0003] Currently, digital relay protection testers are generally used in smart substations to test GOOSE (Generic Object Oriented Substation Event) and SV (Sampled Value). The GOOSE and SV messages output by the digital relay protection tester are used to check the correctness of the virtual terminal connections of the protection device, ensuring that the output logic meets design requirements. However, the operating time tested by this method is not the true output operating time because the intelligent terminal and the protection / safety device are physically separated, making it impossible to directly acquire the trip output contact signal. Utility Model Content

[0004] In view of this, the present invention provides a circuit breaker intelligent terminal protection action detection system based on wireless transmission, which solves the problem in the prior art that the trip output contact signal cannot be directly collected due to the physical separation between the intelligent terminal and the protection / safety device. To achieve one or more of the above objectives, or other objectives, the present invention proposes a circuit breaker intelligent terminal protection action detection system based on wireless transmission, characterized in that it includes: a host transmitting module and a slave receiving module; The host transmitting module includes an action contact detection unit, an opto-isolation unit, a signal-to-frequency conversion unit, a control unit, a wireless transmitting unit, and a host power supply unit. The host power supply unit provides power to the opto-isolation unit, the signal-to-frequency conversion unit, the control unit, and the wireless transmitting unit. The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit sends the voltage signal to the input terminal of the signal-to-frequency conversion unit through the opto-isolation unit. The output terminal of the signal-to-frequency conversion unit is signal-connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The slave receiving module includes a wireless receiving unit, a digital output switch control output unit, and a slave power supply unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit, and the output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch control output unit.

[0005] Optionally, the control unit includes a control subunit, which is a microcontroller subunit and / or a field-programmable gate array (FPGA) control subunit, and the input terminal of the control subunit is connected to the output terminal of the signal-to-frequency conversion unit.

[0006] Optionally, the control unit further includes an analog-to-digital converter, the input of which is signal-connected to the output of the control subunit, and the output of which is connected to the wireless transmitting unit.

[0007] Optionally, the output of the analog-to-digital converter is connected to the wireless transmitting unit via an SPI interface.

[0008] Optionally, the wireless transmitting unit is a LORA wireless signal transmitting unit, and the wireless receiving unit is a LORA wireless receiving and transmitting unit, wherein the wireless transmitting unit and the wireless receiving unit are connected via LORA wireless signals.

[0009] Optionally, the action contact detection unit uses a high-voltage optocoupler acquisition device to acquire the voltage signal of the circuit breaker smart terminal.

[0010] Optionally, the host transmitting module further includes a signal enhancement unit, the input of which is connected to the output of the wireless transmitting unit, and the output of which is wirelessly connected to the wireless receiving unit.

[0011] Optionally, the control unit is equipped with a real-time clock (RTC) module, which is used to mark the timestamp of the trip signal and upload it to the slave device via LoRa. This is used to compare the time difference with the local clock of the relay protection tester and calculate the total delay of the protection action.

[0012] Optionally, the system further includes a digital relay protection tester, which is signal-connected to the digital output switch control output unit.

[0013] Optionally, the system further includes an intelligent line protection device, and the digital relay protection tester is connected to the intelligent line protection device.

[0014] Implementing the embodiments of this utility model will have the following beneficial effects: This application uses the input terminal of the action contact detection unit to receive the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit transmits the voltage signal to the input terminal of the signal frequency conversion unit through the opto-isolation unit. The output terminal of the signal frequency conversion unit is connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit. The output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch control output unit. This ultimately achieves remote capture and real-time transmission of the intelligent terminal trip output signal, filling a technological gap in the field of intelligent substation protection verification and providing innovative protection for the safe and stable operation of the power grid. It realizes non-contact, long-distance, and highly reliable monitoring of the circuit breaker trip output contacts in intelligent substations, changing the previous situation where the action time could only be indirectly estimated through GOOSE messages. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in: Figure 1 This is a schematic diagram of the structure of a circuit breaker intelligent terminal protection action detection system based on wireless transmission, provided in an embodiment of this application. Figure 2 This is a schematic diagram illustrating an application scenario of a circuit breaker intelligent terminal protection action detection system based on wireless transmission, as provided in an embodiment of this application. Figure 3 This is a schematic diagram of another circuit breaker intelligent terminal protection action detection system based on wireless transmission provided in this application embodiment. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1 As shown, this application provides a circuit breaker intelligent terminal protection action detection system based on wireless transmission, including: a host transmitting module and a slave receiving module; The host transmitting module includes an action contact detection unit, an opto-isolation unit, a signal-to-frequency conversion unit, a control unit, a wireless transmitting unit, and a host power supply unit. The host power supply unit provides power to the opto-isolation unit, the signal-to-frequency conversion unit, the control unit, and the wireless transmitting unit. The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit sends the voltage signal to the input terminal of the signal-to-frequency conversion unit through the opto-isolation unit. The output terminal of the signal-to-frequency conversion unit is signal-connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The slave receiving module includes a wireless receiving unit, a digital output switch control output unit, and a slave power supply unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit, and the output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch control output unit.

[0020] The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit transmits the voltage signal to the input terminal of the signal frequency conversion unit through the opto-isolation unit. The output terminal of the signal frequency conversion unit is connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit. The output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch quantity control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch quantity control output unit. This ultimately enables remote capture and real-time transmission of the intelligent terminal trip output signal, filling a technological gap in the field of intelligent station protection verification and providing innovative protection for the safe and stable operation of the power grid.

[0021] In one possible implementation, the control unit includes a control subunit, which employs a microcontroller subunit and / or a field-programmable gate array (FPGA) control subunit, and the input of the control subunit is signal-connected to the output of the signal-to-frequency conversion unit.

[0022] For example, an MCU, or Microcontroller Unit, is a highly integrated chip that includes components such as a CPU, memory, timers, and I / O interfaces, used to control various devices and systems. It has advantages such as low cost, low power consumption, and ease of use, making it suitable for tasks that do not require high-performance computing, such as home appliance control, toys, and sensor data acquisition. MCU programming is typically done using high-level languages ​​such as C or C++.

[0023] For example, an FPGA, or Field Programmable Gate Array control subunit, is an integrated circuit that can be programmed by the user and configured into any desired logic circuit. The advantages of FPGAs are high flexibility and strong parallel processing capabilities, making them suitable for applications requiring high-performance computing and complex logic processing, such as digital signal processing, image processing, and communication systems. FPGA programming is typically done using hardware description languages ​​such as Verilog or VHDL.

[0024] In one possible implementation, the control unit further includes an analog-to-digital converter (ADC), the input of which is signal-connected to the output of the control subunit, and the output of which is connected to the wireless transmitting unit.

[0025] For example, an analog-to-digital converter (ADC) is a converter that transforms an analog quantity, after comparison with a standard quantity (or reference quantity), into a discrete signal represented by a binary value; it is also known as an A / D converter. The input terminal of the ADC is connected to the output terminal of the control subunit, and is used to convert the signal output by the control subunit into a discrete signal, thereby enabling the wireless transmitting unit to generate a LoRa wireless signal based on the discrete signal.

[0026] In one possible implementation, the output of the analog-to-digital converter is connected to the wireless transmitting unit via an SPI interface.

[0027] For example, the SPI interface is a high-speed full-duplex synchronous communication bus, which is a synchronous serial peripheral interface that enables the MCU to communicate with various peripheral devices in a serial manner to exchange information.

[0028] In one possible implementation, the wireless transmitting unit is a LORA wireless signal transmitting unit, and the wireless receiving unit is a LORA wireless receiving and transmitting unit, wherein the wireless transmitting unit and the wireless receiving unit are connected via LORA wireless signals.

[0029] For example, LoRa wireless signal communication can meet the actual needs of smart substations, while other wireless communication technologies (such as Wi-Fi and Bluetooth) may not meet the actual needs of smart substations in terms of transmission distance, anti-interference capability, or power consumption. LoRa wireless communication technology has the following advantages: Long-distance communication: LoRa technology can achieve communication distances of several kilometers or even tens of kilometers, far exceeding traditional wireless communication technologies, giving it a unique advantage in wide-area IoT applications; Low power consumption: LoRa technology adopts a low-power design, allowing node devices to be powered by batteries for up to several years, reducing maintenance and battery replacement costs; power consumption in standby mode is only in the microwatt range; Massive connectivity: LoRa technology supports massive connectivity, with each base station able to connect thousands of node devices simultaneously, suitable for large-scale IoT application scenarios; Strong anti-interference capability: LoRa technology uses spread spectrum modulation technology, possessing excellent anti-interference performance, and can work stably in complex wireless environments; even in high-noise environments, LoRa devices can maintain stable communication quality, ensuring reliable data transmission; High efficiency: LoRa wireless technology is highly efficient, achieving transmission in a short time, thereby improving network efficiency. Furthermore, LoRa wireless technology supports multiple data protocols, thereby improving transmission speeds; low cost: LoRa wireless technology is significantly cheaper than other wireless technologies, making it a more preferable option, especially for large-scale deployments. Additionally, LoRa supports many free software programs, further reducing usage costs; high reliability: LoRa wireless technology offers high reliability, providing more reliable network connections and supporting multiple security protocols to protect network security. Furthermore, LoRa supports various encryption technologies for better network security; self-organizing network capability: LoRa devices can automatically form a star or mesh network, requiring minimal configuration and setup between devices, making rapid deployment and use of LoRa easy over large areas, facilitating the implementation of the Internet of Things (IoT); high security: LoRa technology employs encryption technology to ensure secure communication.

[0030] In one possible implementation, the action contact detection unit uses a high-voltage optocoupler acquisition device to acquire the voltage signal of the circuit breaker smart terminal.

[0031] For example, based on the photoelectric effect—the phenomenon of charge movement when light shines on an object—when light shines on a photodiode in a transmitter, a photocurrent is generated, emitting a beam of infrared light into an isolated region. This infrared light can penetrate the insulating material and be detected in the receiver. Another photodiode in the receiver converts the optical signal into an electrical signal for processing in the receiving circuitry.

[0032] For example, the advantages of high-voltage optocoupler acquisition devices include: Electrical insulation capability: Due to the mutual isolation between the input and output of the high-voltage optocoupler and the unidirectional nature of the electrical signal transmission, it has excellent electrical insulation and anti-interference capabilities; Anti-interference capability: The optical signal transmission method of the optocoupler gives it strong anti-interference capability. The optical signal is not affected by electromagnetic interference during transmission, so even in environments with strong electromagnetic interference, the optocoupler can maintain stable operating performance; Stable operation: The optocoupler has a high common-mode rejection ratio (CMRR), which can effectively suppress common-mode interference and eliminate noise, improving the signal-to-noise ratio and transmission quality; Contactless: The optocoupler does not require relay control contacts or isolation transformers; Long service life: The optocoupler has a long service life and is suitable for long-term operation; High transmission efficiency: The optocoupler has high transmission efficiency and can effectively transmit signals.

[0033] In one possible implementation, the control unit is equipped with a real-time clock (RTC) module, which marks the timestamp of the trip signal and uploads it to the slave device via LoRa. This is used to compare the time difference with the local clock of the relay protection tester and calculate the total delay of the protection action.

[0034] In one possible implementation, both the host power supply unit and the slave power supply unit are power management units.

[0035] For example, the power management unit receives control codes through its connection with the central control system, and performs timed, delayed, and controlled switching of the power supplies of connected peripheral devices, thereby managing and protecting the peripheral connected devices.

[0036] For example, the power management unit has a high degree of integration, integrating several traditionally discrete power management chips into one unit, reducing the number of components, achieving higher power conversion efficiency and lower power consumption, adapting to smaller board space, reducing costs, and providing all the power supplies required by the main chip at various voltage levels. It also integrates over / under voltage (OVP / UVP), over temperature (OTP), and over current (OCP) protection circuits.

[0037] Example 1: When the voltage changes, the high-voltage optocoupler converts the electrical signal through the photoelectric effect and outputs a corresponding logic signal (high or low level), which is then transmitted to the MCU microcontroller for further processing. For example, when the intelligent terminal protection action output contact closes, the upper end of the output pressure plate is connected to DC220V, the high-voltage optocoupler input is connected, and the output is also conducting. The HL-TTL logic signal terminal is pulled low, and the output logic signal is low. When the intelligent terminal protection action output contact returns, the high-voltage optocoupler input DC220V is disconnected, and the output is also disconnected. The HL-TTL logic signal terminal is pulled high, and the output logic signal is high, completing the signal-to-frequency conversion. Simultaneously, the high-voltage optocoupler provides electrical isolation, effectively preventing the high voltage in the power system from affecting the test equipment and ensuring safety. After receiving the logic signal from the high-voltage optocoupler acquisition device, the MCU and FPGA control modules convert the analog signal into a digital signal through the ADC (analog-to-digital converter) module for processing and calculate the action time of the protection device. The processed data is transmitted to the LORA wireless communication module (LORA wireless receiver-transmitter unit) via the SPI interface for remote data transmission.

[0038] The wireless receiving unit receives the LORA wireless signal transmitted from the host transmitting unit and converts the wireless signal into a DO switch output signal, thereby detecting the protection action exit time of the smart terminal.

[0039] The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit transmits the voltage signal to the input terminal of the signal frequency conversion unit through the opto-isolation unit. The output terminal of the signal frequency conversion unit is connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit. The output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch quantity control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch quantity control output unit. This ultimately enables remote capture and real-time transmission of the intelligent terminal trip output signal, filling a technological gap in the field of intelligent station protection verification and providing innovative protection for the safe and stable operation of the power grid.

[0040] In one possible implementation, the system further includes a digital relay protection tester, which is signal-connected to the digital output switch control output unit.

[0041] In one possible implementation, the system further includes an intelligent line protection device, and the digital relay protection tester is connected to the intelligent line protection device.

[0042] Example 2: like Figure 2 As shown, the host transmitter module of the circuit breaker intelligent terminal protection action detection system based on wireless transmission is connected to the circuit breaker intelligent terminal. Specifically, the action contact detection unit in the host transmitter module is connected to the protection circuit within the circuit breaker intelligent terminal. When the voltage changes, the high-voltage optocoupler converts the electrical signal through the photoelectric effect and outputs a corresponding logic signal (high level or low level), which is then transmitted to the MCU microcontroller for further processing. For example, when the intelligent terminal protection action output contact closes, the upper end of the output pressure plate is connected to DC220V, the input terminal of the high-voltage optocoupler is connected, and the output terminal is also conducting. The logic signal terminal HL-TTL is pulled low, and the output logic signal is low. When the intelligent terminal protection action output contact returns, the DC220V input terminal of the high-voltage optocoupler is disconnected, and the output terminal is also disconnected. The logic signal terminal HL-TTL is pulled high, and the output logic signal is high, completing the signal-to-frequency conversion. At the same time, the high-voltage optocoupler provides electrical isolation, effectively avoiding the influence of high voltage in the power system on the test equipment and ensuring safety. After receiving the logic signals from the high-voltage optocoupler acquisition device, the MCU and FPGA control modules convert the analog signals into digital signals through the ADC (analog-to-digital converter) module for processing and calculate the action time of the protection device. The processed data is then transmitted to the LORA wireless communication module via the SPI interface for remote data transmission.

[0043] The wireless receiving unit receives the LORA wireless signal transmitted from the host transmitting unit and converts the wireless signal into a DO switch output signal, providing an input for the time test of the digital relay protection tester, and thereby detecting the protection action output time of the intelligent terminal. The switch response of the digital relay protection tester is in response to the DO switch output signal. The digital relay protection tester is connected to the intelligent line protection device, and the intelligent line protection device is connected to the circuit breaker intelligent terminal through a multi-layer GOOSE switch.

[0044] MCU microcontrollers have powerful processing and storage capabilities with high integration. They are also flexible, can expand external device interfaces, have strong ability to perform complex functions, can provide processing for different types of tasks, and have a wider range of applications.

[0045] The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit transmits the voltage signal to the input terminal of the signal frequency conversion unit through the opto-isolation unit. The output terminal of the signal frequency conversion unit is connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit. The output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch quantity control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch quantity control output unit. This ultimately enables remote capture and real-time transmission of the intelligent terminal trip output signal, filling a technological gap in the field of intelligent station protection verification and providing innovative protection for the safe and stable operation of the power grid.

[0046] In one possible implementation, the host transmitting module further includes a signal enhancement unit, the input of which is connected to the output of the wireless transmitting unit, and the output of which is wirelessly connected to the wireless receiving unit.

[0047] For example, when enhancing the LoRa wireless signal, the first LoRa module (the wireless transmitting unit) is controlled to receive the first pairing signal from the second LoRa module (the wireless receiving unit). Based on the first pairing signal, the first LoRa module is controlled to pair with the corresponding second LoRa module, and the first LoRa module is controlled to send data to the second LoRa module. This ensures that the mobile terminal can communicate with the wearable device even when the network communication signal is poor, enhancing the user experience. Specifically, a control signal is sent to control the first LoRa module to receive the first pairing signal from the second LoRa module; based on the first pairing signal, the first LoRa module is controlled to pair with the corresponding second LoRa module; and the first LoRa module is controlled to send data to the second LoRa module.

[0048] Example 3: like Figure 3As shown, when the voltage changes, the high-voltage optocoupler converts the electrical signal through the photoelectric effect and outputs a corresponding logic signal (high or low level), which is then transmitted to the MCU microcontroller for further processing. For example, when the intelligent terminal protection action output contact closes, the upper end of the output pressure plate is connected to DC220V, the high-voltage optocoupler input is connected, the output is also conducting, the logic signal terminal HL-TTL is pulled low, and the output logic signal is low. When the intelligent terminal protection action output contact returns, the high-voltage optocoupler input DC220V is disconnected, the output is also disconnected, the logic signal terminal HL-TTL is pulled high, and the output logic signal is high, completing the signal-to-frequency conversion. Simultaneously, the high-voltage optocoupler provides electrical isolation, effectively preventing the high voltage in the power system from affecting the test equipment and ensuring safety. After receiving the logic signal from the high-voltage optocoupler acquisition device, the MCU and FPGA control modules convert the analog signal into a digital signal through the ADC (analog-to-digital converter) module for processing and calculate the action time of the protection device. The processed data is transmitted to the LORA wireless communication module (LORA wireless receiver and transmitter unit) via the SPI interface. The signal enhancement unit enhances the LORA wireless signal emitted by the LORA wireless communication module (LORA wireless receiver and transmitter unit) and performs remote data transmission based on the enhanced LORA wireless signal.

[0049] The wireless receiving unit receives the LORA wireless signal transmitted from the host transmitting unit and converts the wireless signal into a DO switch output signal, thereby detecting the protection action exit time of the smart terminal.

[0050] The signal enhancement unit enhances the LORA wireless signal emitted by the LORA wireless communication module (LORA wireless receiver and transmitter unit), ensuring the reliability of signal transmission and enabling remote capture and real-time transmission of trip output signals from smart terminals. This fills a technological gap in the field of smart station protection verification and provides innovative protection for the safe and stable operation of the power grid.

[0051] Example 4: When the voltage changes, the high-voltage optocoupler converts the electrical signal through the photoelectric effect and outputs a corresponding logic signal (high or low level), which is then transmitted to the FPGA for further processing. For example, when the intelligent terminal protection action output contact closes, the upper end of the output pressure plate is connected to DC220V, the high-voltage optocoupler input is connected, and the output is also conducting. The HL-TTL logic signal terminal is pulled low, and the output logic signal is low. When the intelligent terminal protection action output contact returns, the high-voltage optocoupler input DC220V is disconnected, and the output is also disconnected. The HL-TTL logic signal terminal is pulled high, and the output logic signal is high, completing the signal-to-frequency conversion. Simultaneously, the high-voltage optocoupler provides electrical isolation, effectively preventing the high voltage in the power system from affecting the test equipment and ensuring safety. After receiving the logic signal from the high-voltage optocoupler acquisition device, the MCU and FPGA control modules convert the analog signal into a digital signal through the ADC (analog-to-digital converter) module for processing and calculate the action time of the protection device. The processed data is transmitted to the LORA wireless communication module (LORA wireless receiver and transmitter unit) via the SPI interface. The signal enhancement unit enhances the LORA wireless signal emitted by the LORA wireless communication module (LORA wireless receiver and transmitter unit) and performs remote data transmission based on the enhanced LORA wireless signal.

[0052] FPGAs are programmable, meaning designers can implement the required hardware circuit functions by calling internal resources and flexibly modify the circuit. This makes FPGAs ideal for testing and verification, especially in cases requiring complex circuits. Furthermore, the hardware implementation of FPGAs offers advantages in handling real-time tasks and parallel computing. Multiple operations can be executed simultaneously, which is crucial for applications requiring high-speed data processing. FPGAs can be reprogrammed an unlimited number of times, loading a new scheme in just a few hundred milliseconds. This makes FPGAs extremely useful in product development and prototyping, allowing for rapid iteration and updates. FPGAs can act as accelerators or RAM to improve system performance. In addition, FPGAs can implement new standards or algorithms, or add various communication interfaces as needed, helping to reduce system costs and extend product lifecycles. Remote capture and real-time transmission of trip output signals from intelligent terminals fills a technological gap in the field of intelligent substation protection verification, providing innovative guarantees for the safe and stable operation of the power grid.

[0053] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

[0054] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A circuit breaker intelligent terminal protection action detection system based on wireless transmission, characterized in that, include: Master transmitter module and slave receiver module; The host transmitting module includes an action contact detection unit, an opto-isolation unit, a signal-to-frequency conversion unit, a control unit, a wireless transmitting unit, and a host power supply unit. The host power supply unit provides power to the opto-isolation unit, the signal-to-frequency conversion unit, the control unit, and the wireless transmitting unit. The input terminal of the action contact detection unit receives the voltage signal from the circuit breaker intelligent terminal. The output terminal of the action contact detection unit sends the voltage signal to the input terminal of the signal-to-frequency conversion unit through the opto-isolation unit. The output terminal of the signal-to-frequency conversion unit is signal-connected to the input terminal of the control unit. The output terminal of the control unit is connected to the wireless transmitting unit. The slave receiving module includes a wireless receiving unit, a digital output switch control output unit, and a slave power supply unit. The input terminal of the wireless receiving unit receives the wireless signal transmitted by the wireless transmitting unit, and the output terminal of the wireless receiving unit is connected to the input terminal of the digital output switch control output unit. The slave power supply unit is electrically connected to both the wireless receiving unit and the digital output switch control output unit.

2. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The control unit includes a control subunit, which is a microcontroller subunit and / or a field-programmable gate array (FPGA) control subunit. The input terminal of the control subunit is connected to the output terminal of the signal-to-frequency conversion unit.

3. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 2, characterized in that, The control unit further includes an analog-to-digital converter, the input of which is signal-connected to the output of the control subunit, and the output of which is connected to the wireless transmitting unit.

4. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 3, characterized in that, The output of the analog-to-digital converter is connected to the wireless transmitting unit via an SPI interface.

5. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The wireless transmitting unit is a LORA wireless signal transmitting unit, and the wireless receiving unit is a LORA wireless receiving and transmitting unit. The wireless transmitting unit and the wireless receiving unit are connected via LORA wireless signals.

6. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The action contact detection unit uses a high-voltage optocoupler acquisition device to collect the voltage signal of the circuit breaker's intelligent terminal.

7. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The host transmitter module also includes a signal enhancement unit, the input of which is connected to the output of the wireless transmitter unit, and the output of which is wirelessly connected to the wireless receiver unit.

8. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The control unit is equipped with a real-time clock (RTC) module, which is used to mark the timestamp of the trip signal and upload it to the slave device via LoRa. This is used to compare the time difference with the local clock of the relay protection tester and calculate the total delay of the protection action.

9. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 1, characterized in that, The system also includes a digital relay protection tester, which is connected to the digital output switch control output unit.

10. The circuit breaker intelligent terminal protection action detection system based on wireless transmission as described in claim 9, characterized in that, The system also includes an intelligent line protection device, and the digital relay protection tester is connected to the intelligent line protection device.

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