Electronic tripping device and control method thereof

Abstract

The invention relates to the technical field of circuit breakers, in particular to an electronic tripping device and a control method thereof.Current signals and voltage signals of a circuit breaker are collected through a current sampling module and a voltage sampling module respectively, and an electric energy metering module calculates the current signals and the voltage signals to obtain a power measurement result and an electric energy measurement result; the protection calculation module calculates the current signal and the voltage signal to obtain a protection calculation result, the processor sends a trip coil activation instruction to the input and output control module when the protection calculation result is that a protection action is generated, and the input and output control module activates the trip coil after receiving the trip coil activation instruction. According to the electronic tripping device, metering and protection functions of the circuit breaker are realized, the electronic tripping device is relatively simple in structure, the size of a circuit board is reduced, the overall cost is reduced, and the reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to an electronic tripping device and a control method thereof. Background Art

[0002] In the power system, low-voltage circuit breakers are the core of circuit protection, and their performance is directly related to the safe operation of the system. Traditional mechanical tripping devices are difficult to meet the needs of modern power systems due to their slow response, limited measurement accuracy, and insufficient intelligent management.

[0003] To solve the above problems, the patent with publication number CN213457698U proposes a multi-core electronic tripping system, including a base core part, a management core part and an extended core part; the base core part includes a base core MCU, the management core part includes a management core MCU, the extended core part includes a plurality of extended core modules, each extended core module includes an extended core MCU, the base core MCU is communicatively connected to the management core MCU, and the management core MCU is communicatively connected to each extended core MCU respectively; the base core MCU is used for the most basic sampling and protection functions, thereby better realizing high-precision measurement and high-reliability protection, the management MCU realizes human-computer interaction, and there is no need for the base core part to be directly connected to an external module, thereby improving safety and reliability, and the extended part includes a plurality of extended modules, which is conducive to meeting the diversity of customer needs and facilitating the expansion of circuit breaker functions.

[0004] However, although the system has achieved significant improvements in functionality, its complex structure results in a relatively large circuit board, high overall cost, and low reliability. Summary of the invention

[0005] Based on this, it is necessary to provide an electronic tripping device with a relatively simple structure and a control method thereof in order to solve the problem that the existing electronic tripping system has a complex structure.

[0006] In a first aspect, the present application provides an electronic tripping device, including a current sampling module, a voltage sampling module, an electric energy metering module, a protection calculation module, a processor, an input-output control module, a tripping coil, a tripping power supply and a system power supply; the current sampling module and the voltage sampling module are both connected to the first end of the electric energy metering module, the second end of the electric energy metering module is connected to the first end of the processor, the current sampling module and the voltage sampling module are both connected to the first end of the protection calculation module, the second end of the protection calculation module is connected to the first end of the processor, the second end of the processor is connected to the first end of the input-output control module, the second end of the input-output control module is connected to the first end of the tripping coil, the second end of the tripping coil is connected to the first end of the tripping power supply, and the second end of the tripping power supply and the system power supply are both connected to the current sampling module;

[0007] The current sampling module is used to collect the current signal of the circuit breaker and send the current signal to the electric energy metering module and the protection calculation module;

[0008] The voltage sampling module is used to collect the voltage signal of the circuit breaker and send the voltage signal to the electric energy metering module and the protection calculation module;

[0009] The electric energy metering module is used to calculate the current signal and the voltage signal to obtain the power measurement result and the electric energy measurement result;

[0010] The protection calculation module is used to calculate the current signal and the voltage signal to obtain the protection calculation result;

[0011] The processor is used to perform sampling control on the electric energy metering module to obtain power measurement results and electric energy measurement results, and send the power measurement results and electric energy measurement results to the input and output control module; the processor is also used to perform sampling control on the protection calculation module to obtain protection calculation results, and send a trip coil activation instruction to the input and output control module when the protection calculation result is to generate a protection action;

[0012] The input-output control module is used to activate the trip coil after receiving the trip coil activation instruction.

[0013] In one embodiment, the current sampling module includes a current transformer, a first signal conditioning circuit and a first analog-to-digital conversion circuit, the first end of the current transformer is connected to the first end of the first signal conditioning circuit, the second end of the first signal conditioning circuit is connected to the first end of the first analog-to-digital conversion circuit, the electric energy metering module and the protection calculation module are both connected to the second end of the first analog-to-digital conversion circuit; the second end of the trip power supply and the system power supply are both connected to the second end of the current transformer;

[0014] The current transformer is used to collect the current signal of the circuit breaker and send the current signal to the first signal conditioning circuit;

[0015] The first signal conditioning circuit is used to preprocess the current signal and send the preprocessed current signal to the first analog-to-digital conversion circuit;

[0016] The first analog-to-digital conversion circuit is used to sample the preprocessed current signal to obtain current data of the circuit breaker, and send the current data to the electric energy metering module and the protection calculation module.

[0017] In one embodiment, the current sampling module further includes a gain amplifier circuit, the second end of the first signal conditioning circuit is connected to the first end of the gain amplifier circuit, and the second end of the gain amplifier circuit is connected to the first end of the first analog-to-digital conversion circuit;

[0018] The gain amplifier circuit is used to amplify the preprocessed current signal and transmit it to the first analog-to-digital conversion circuit.

[0019] In one embodiment, the voltage sampling module includes a resistor voltage divider circuit, a second signal conditioning circuit and a second analog-to-digital conversion circuit, the first end of the resistor voltage divider circuit is connected to the N line, the second end of the resistor voltage divider circuit is connected to the first end of the second signal conditioning circuit, the second end of the second signal conditioning circuit is connected to the first end of the second analog-to-digital conversion circuit, and the electric energy metering module and the protection calculation module are both connected to the second end of the second analog-to-digital conversion circuit;

[0020] The resistor voltage divider circuit is used to collect the voltage signal of the circuit breaker and send the voltage signal to the second signal conditioning circuit;

[0021] The second signal conditioning circuit is used for preprocessing the voltage signal and sending the preprocessed voltage signal to the second analog-to-digital conversion circuit;

[0022] The second analog-to-digital conversion circuit is used to sample the preprocessed voltage signal to obtain voltage data of the circuit breaker, and send the voltage data to the electric energy metering module and the protection calculation module.

[0023] In one of the embodiments, the electronic tripping device further includes a switch position monitoring module, and the switch position monitoring module is connected to the third terminal of the input and output control module;

[0024] The switch position monitoring module is used to send a contact position signal to the input-output control module, and the input-output control module sends the contact position signal to the processor; the processor is also used to determine the current circuit breaker state according to the contact position signal.

[0025] In one embodiment, the electronic tripping device further includes a voltage stabilizing module, the current sampling module is connected to a first end of the voltage stabilizing module, and a second end of the tripping power supply and a system power supply are both connected to the second end of the voltage stabilizing module.

[0026] In one embodiment, the electronic tripping device further includes a communication module and an RS485 bus module; the first end of the communication module is connected to the third end of the processor, the second end of the communication module is connected to the first end of the RS485 bus module, and the second end of the RS485 bus module is used to connect to an external module.

[0027] In one embodiment, the electronic tripping device further includes a display module, a key input module, a storage module, a clock module, a temperature detection module, an operation monitoring module and a debugging module.

[0028] In a second aspect, the present application also provides a control method for an electronic tripping device. The method comprises:

[0029] Step S1, obtaining the power measurement result and the electric energy measurement result sent by the electric energy metering module, and sending the power measurement result and the electric energy measurement result to the input and output control module;

[0030] Step S2, obtaining the protection calculation result sent by the protection calculation module;

[0031] Step S3, when the protection calculation result is to generate a protection action, a trip coil activation instruction is sent to the input-output control module; the input-output control module activates the trip coil after receiving the trip coil activation instruction.

[0032] In one embodiment, the control method of the electronic tripping device further includes:

[0033] Step S4, obtaining a contact position signal sent by the input and output control module;

[0034] Step S5, determining the current circuit breaker state according to the contact position signal.

[0035] The above-mentioned electronic tripping device and control method thereof collect the current signal and voltage signal of the circuit breaker respectively through the current sampling module and the voltage sampling module, the electric energy metering module calculates the current signal and the voltage signal to obtain the power measurement result and the electric energy measurement result, the protection calculation module calculates the current signal and the voltage signal to obtain the protection calculation result, and the processor sends the tripping coil activation instruction to the input-output control module when the protection calculation result is to generate a protection action, and the input-output control module activates the tripping coil after receiving the tripping coil activation instruction, which not only realizes the metering and protection functions of the circuit breaker, but also the electronic tripping device has a relatively simple structure, reduces the volume of the circuit board, reduces the overall cost, and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of an electronic tripping device in one embodiment;

[0037] Figure 2 It is a schematic diagram of the structure of an electronic tripping device in another embodiment;

[0038] Figure 3 It is a structural schematic diagram of an electronic tripping device in yet another embodiment;

[0039] Figure 4 A schematic diagram of the structure of an electronic tripping device in yet another embodiment;

[0040] Figure 5 A schematic diagram of a control method of an electronic tripping device in an embodiment;

[0041] Figure 6 is a schematic structural diagram of a first signal conditioning circuit in one embodiment;

[0042] Figure 7 It is a schematic diagram of the structure of a resistor voltage divider circuit and a second signal conditioning circuit in one embodiment;

[0043] Figure 8 is a schematic structural diagram of a tripping circuit in one embodiment;

[0044] Fig. 9 A schematic diagram of the structure of a key circuit in one embodiment;

[0045] Fig.10 FIG. 4 is a schematic diagram of the structure of a switch position monitoring module in an embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] In one embodiment, Figure 1 As shown, an electronic tripping device is provided, including a current sampling module 100, a voltage sampling module 200, an electric energy metering module, a protection calculation module, a processor, an input-output control module, a tripping coil, a tripping power supply and a system power supply. The current sampling module 100 and the voltage sampling module 200 are both connected to the first end of the electric energy metering module, the second end of the electric energy metering module is connected to the first end of the processor, the current sampling module 100 and the voltage sampling module 200 are both connected to the first end of the protection calculation module, the second end of the protection calculation module is connected to the first end of the processor, the second end of the processor is connected to the first end of the input-output control module, the second end of the input-output control module is connected to the first end of the tripping coil, the second end of the tripping coil is connected to the first end of the tripping power supply, and the second end of the tripping power supply and the system power supply are both connected to the current sampling module 100.

[0048] The current sampling module 100 is used to collect the current signal of the circuit breaker and send the current signal to the electric energy metering module and the protection calculation module. The current signal of the circuit breaker can be a three-phase current signal of the circuit where the circuit breaker is located. After the current sampling module 100 collects the three-phase current signal, it is converted into a digital signal after amplification, filtering and analog-to-digital conversion, and then transmitted to the electric energy metering module and the protection calculation module for further processing by the electric energy metering module and the protection calculation module.

[0049] The voltage sampling module 200 is used to collect the voltage signal of the circuit breaker and send the voltage signal to the electric energy metering module and the protection calculation module. The input end of the voltage sampling module 200 is connected to the N line, and the voltage signal of the circuit breaker can be a three-phase voltage signal of the circuit where the circuit breaker is located. The voltage sampling module 200 amplifies, filters and performs analog-to-digital conversion on the three-phase voltage signal and converts it into a digital signal and outputs it to the electric energy metering module and the protection calculation module.

[0050] The electric energy metering module is used to calculate the current signal and the voltage signal to obtain the power measurement result and the electric energy measurement result. Specifically, the electric energy metering module can use the power calculation formula (such as instantaneous power P = UIcosθ, θ is the phase difference between voltage and current) and the electric energy integration algorithm (such as obtaining electric energy by integrating instantaneous power) to calculate the current power measurement result and the accumulated electric energy measurement result, and then send the power and electric energy data to the processor. Furthermore, after obtaining the current signal and the voltage signal, the electric energy metering module can first synchronize these digital signals to ensure the temporal consistency of the current and voltage signals, so as to perform accurate power and electric energy calculations.

[0051] The protection calculation module is used to calculate the current signal and the voltage signal to obtain the protection calculation result. Specifically, the protection calculation module can analyze and judge the received current and voltage signals according to the preset protection logic (such as overcurrent protection, short circuit protection, overvoltage protection, undervoltage protection, etc.). If any abnormal situation is detected, such as the current exceeds the set threshold, the corresponding protection calculation result is generated, and then the protection calculation result is sent to the processor for further processing. Among them, the protection calculation result may include the generation of protection action, protection type, etc.

[0052] The processor is used to perform sampling control on the electric energy metering module to obtain power measurement results and electric energy measurement results, and send the power measurement results and electric energy measurement results to the input and output control module. The processor is also used to perform sampling control on the protection calculation module to obtain protection calculation results, and send a trip coil activation instruction to the input and output control module when the protection calculation result is to generate a protection action.

[0053] Specifically, the processor regularly samples data from the energy metering module and the protection calculation module, including power measurement results, energy measurement results, and protection calculation results, and then further processes the acquired data, such as data verification, format conversion, etc. In addition, the processor can also send the power measurement results and energy measurement results to the user, so that the user can monitor the circuit breaker conveniently.

[0054] The input and output control module is used to activate the trip coil after receiving the trip coil activation instruction, and the circuit breaker is disconnected after the trip coil is activated.

[0055] The trip power supply is used to power the trip coil, and the system power supply is used to power the entire system, that is, the electronic trip device. Figure 1 (not shown) provides power for the trip power supply and the system power supply. At this time, the current sampling module 100 only samples but does not supply power. When the external auxiliary power supply cannot supply power due to an abnormal external power supply voltage, it automatically switches to the current sampling module 100 for power supply. At this time, the current sampling module 100 supplies power and performs current sampling.

[0056] The electronic tripping device of this embodiment collects the current signal and the voltage signal of the circuit breaker respectively through the current sampling module 100 and the voltage sampling module 200, the electric energy metering module calculates the current signal and the voltage signal to obtain the power measurement result and the electric energy measurement result, the protection calculation module calculates the current signal and the voltage signal to obtain the protection calculation result, and the processor sends the trip coil activation instruction to the input-output control module when the protection calculation result is to generate a protection action, and the input-output control module activates the trip coil after receiving the trip coil activation instruction, which not only realizes the metering and protection functions of the circuit breaker, but also the electronic tripping device has a simple structure, reduces the volume of the circuit board, and reduces the overall cost.

[0057] In one embodiment, Figure 2 As shown, the current sampling module 100 includes a current transformer 110, a first signal conditioning circuit 120 and a first analog-to-digital conversion circuit 130, the first end of the current transformer 110 is connected to the first end of the first signal conditioning circuit 120, the second end of the first signal conditioning circuit 120 is connected to the first end of the first analog-to-digital conversion circuit 130, the electric energy metering module and the protection calculation module are both connected to the second end of the first analog-to-digital conversion circuit 130; the second end of the trip power supply and the system power supply are both connected to the second end of the current transformer 110.

[0058] The current transformer 110 is used to collect the current signal of the circuit breaker and send the current signal to the first signal conditioning circuit 120. The current transformer 110 is used as the front-end sensor of the current sampling module 100 and is responsible for collecting the current signal in the circuit breaker. It converts a large current into a small current through the principle of electromagnetic induction for subsequent circuit processing. In this embodiment, the current transformer 110 can be an iron core coil type, which has high conversion accuracy and stability and can accurately reflect the current changes in the circuit breaker.

[0059] The first signal conditioning circuit 120 is used to preprocess the current signal and send the preprocessed current signal to the first analog-to-digital conversion circuit 130. The preprocessing process may include amplification, filtering, offset adjustment, etc. to ensure that the current signal is in a suitable level range before analog-to-digital conversion and reduce the influence of noise and interference.

[0060] The first analog-to-digital conversion circuit 130 is used to sample the preprocessed current signal to obtain the current data of the circuit breaker, and send the current data to the electric energy metering module and the protection calculation module. The analog-to-digital conversion circuit (ADC) is the core part of the current sampling module 100, which converts the preprocessed analog current signal into digital current data. This process is achieved through sampling and quantization, where parameters such as sampling rate and resolution can be set by technicians in this field according to the actual required conversion accuracy and speed.

[0061] The current sampling module 100 in this embodiment includes a current transformer 110, a first signal conditioning circuit 120 and a first analog-to-digital conversion circuit 130, which realizes accurate measurement and digital conversion of the circuit breaker current, and provides reliable data support for power metering, protection calculation, etc. of the power system.

[0062] In one embodiment, Figure 3 As shown, the current sampling module 100 further includes a gain amplifier circuit 140 , a second end of the first signal conditioning circuit 120 is connected to a first end of the gain amplifier circuit 140 , and a second end of the gain amplifier circuit 140 is connected to a first end of the first analog-to-digital conversion circuit 130 .

[0063] Among them, the gain amplifier circuit 140 is a programmable gain amplifier circuit. Through programming control, the gain amplifier circuit 140 can automatically adjust its gain multiple according to the actual current size, realize accurate setting and fast switching of the gain, and thus meet the high requirements for current sampling accuracy and protection performance in different application scenarios. Specifically, when the current signal of the circuit breaker is small within the normal working range, the gain amplifier circuit 140 automatically switches to the high gain mode to finely amplify these weak signals to ensure that the measurement accuracy under small currents is not lost; and when encountering a large current situation, the gain amplifier circuit 140 is adjusted to a low gain state to make the analog signal as close as possible to but not exceeding the full-scale AD sampling range, effectively avoiding the signal from exceeding the range of the analog-to-digital converter, and ensuring that the protection action under large currents is still accurate.

[0064] The current sampling module 100 of this embodiment also includes a gain amplifier circuit 140. Through programming control, the gain amplifier circuit 140 can adjust its gain multiple according to the actual current size, thereby achieving accurate setting and fast switching of the gain, meeting the high requirements for current sampling accuracy and protection performance in different application scenarios, and giving the system higher flexibility and adaptability.

[0065] In one embodiment, the first analog-to-digital conversion circuit 130 is a Sigma-Delta analog-to-digital conversion circuit. This type of ADC is known for its high precision, low noise and anti-interference ability, and is very suitable for accurate measurement of current signals in power systems. Further, the Sigma-Delta analog-to-digital conversion circuit can be a multi-channel 24-bit Sigma-Delta analog-to-digital conversion circuit to improve the accuracy of analog-to-digital conversion, thereby improving the working reliability of the electronic trip device.

[0066] In one embodiment, Figure 2 As shown, the voltage sampling module 200 includes a resistor voltage divider circuit 210, a second signal conditioning circuit 220 and a second analog-to-digital conversion circuit 230. The first end of the resistor voltage divider circuit 210 is connected to the N line (neutral line or zero line), the second end of the resistor voltage divider circuit is connected to the first end of the second signal conditioning circuit 220, the second end of the second signal conditioning circuit 220 is connected to the first end of the second analog-to-digital conversion circuit 230, and the electric energy metering module and the protection calculation module are both connected to the second end of the second analog-to-digital conversion circuit 230.

[0067] The resistor voltage divider circuit 210 is used to collect the voltage signal of the circuit breaker and send the voltage signal to the second signal conditioning circuit 220. Specifically, the resistor voltage divider circuit 210 reduces the three-phase voltage on the circuit breaker to a low voltage range suitable for subsequent circuit processing by resistor voltage division.

[0068] The second signal conditioning circuit 220 is used to preprocess the voltage signal and send the preprocessed voltage signal to the second analog-to-digital conversion circuit 230. The preprocessing operation may include filtering, denoising, amplification, offset adjustment, etc. to ensure the quality and stability of the voltage signal.

[0069] The second analog-to-digital conversion circuit 230 is used to sample the pre-processed voltage signal to obtain the voltage data of the circuit breaker, and send the voltage data to the electric energy metering module and the protection calculation module. The second analog-to-digital conversion circuit 230 is responsible for converting the pre-processed analog voltage signal into a digital signal, i.e., voltage data, for subsequent electric energy metering and protection calculation.

[0070] The voltage sampling module 200 of this embodiment includes a resistor voltage divider circuit 210, a second signal conditioning circuit 220 and a second analog-to-digital conversion circuit 230, which realizes accurate voltage sampling and preprocessing, improves the transmission quality of the voltage signal, and thus improves the reliability of subsequent electric energy metering calculations and protection calculations.

[0071] In one embodiment, the second analog-to-digital conversion circuit 230 is a SAR (Successive Approximation Register) type analog-to-digital conversion circuit.

[0072] Among them, the SAR type analog-to-digital conversion circuit has the advantages of fast conversion speed, high precision, low power consumption, simple structure, etc. In a more detailed embodiment, the SAR type analog-to-digital conversion circuit can be a 16-bit SAR type analog-to-digital conversion circuit. The 16-bit SAR type analog-to-digital conversion circuit can convert the preprocessed voltage signal into 16-bit digital voltage data. The 16-bit resolution means that the SAR type analog-to-digital conversion circuit can capture more signal details and achieve higher precision, thereby further improving the performance and reliability of the electronic tripping device.

[0073] This embodiment uses a SAR type analog-to-digital conversion circuit as the second analog-to-digital conversion circuit 230, which can improve the conversion accuracy of voltage data. The SAR type analog-to-digital conversion circuit has the characteristics of simple structure and low power consumption, which further reduces the structural complexity of the electronic tripping device and reduces the cost.

[0074] In one embodiment, Figure 3 As shown, the electronic tripping device further includes a switch position monitoring module, and the switch position monitoring module is connected to the third end of the input-output control module.

[0075] The switch position monitoring module is used to send the contact position signal to the input and output control module, and the input and output control module sends the contact position signal to the processor; the processor is also used to determine the current circuit breaker state according to the contact position signal. Among them, the switch position monitoring module is an independent module, which is composed of two independent travel switches to ensure the redundancy and accuracy of monitoring. In addition, an additional sensor for detecting the free tripping state can be included according to actual needs.

[0076] Specifically, when the contact position of the circuit breaker changes, the corresponding travel switch or sensor is activated to generate a contact position signal. These signals include but are not limited to the closing position signal, the opening position signal and the free tripping position signal. The switch position monitoring module transmits the contact position signal to the input and output control module, which performs preliminary processing on the received signal and forwards it to the processor. The processor receives and analyzes the contact position signal and determines the current state of the circuit breaker (closing, opening, free tripping) according to the preset logic algorithm. If a tripping operation needs to be performed, the processor sends a tripping instruction to the input and output control module, thereby controlling the action of the tripping coil. After the tripping action is completed, the processor can confirm whether the tripping is successful again through the contact position signal, that is, check whether the circuit breaker has been correctly switched to the opening or free tripping state.

[0077] This embodiment provides a switch position monitoring module to detect the contact position signal, which can immediately feedback the circuit breaker status and tripping action results to the processor, ensuring that the system can quickly respond to abnormal situations, protect circuit safety, and improve the working reliability of the electronic tripping device.

[0078] In one embodiment, Figure 3 As shown, the electronic tripping device further includes a voltage stabilizing module 300 , the current sampling module 100 is connected to a first end of the voltage stabilizing module 300 , and a second end of the tripping power supply and a system power supply are both connected to a second end of the voltage stabilizing module 300 .

[0079] Specifically, the voltage stabilizing module 300 can rectify, filter and stabilize the current signal sent by the current sampling module 100 before providing power to the trip power supply and the system power supply. In addition, since the electronic trip device is usually powered by an external auxiliary power supply, the voltage stabilizing module can also be connected to the external auxiliary power supply. The voltage stabilizing module stabilizes the voltage signal of the external auxiliary power supply before providing power to the trip power supply and the system power supply.

[0080] Further, such as Figure 4 As shown, the voltage stabilizing module 300 may also include a rectifier filter voltage stabilizing circuit 310 and a voltage stabilizing circuit 320, wherein the first end of the rectifier filter voltage stabilizing circuit 310 is connected to the current sampling module 100, and the second end is connected to the tripping power supply and the system power supply; the first end of the voltage stabilizing circuit 320 is connected to the external auxiliary power supply, and the second end is connected to the tripping power supply and the system power supply, thereby achieving electrical isolation, thereby further improving the stability of power supply.

[0081] In this embodiment, the voltage stabilizing module 300 is provided to stabilize the current sampling module 100 and the external auxiliary power supply before supplying power to the trip power supply and the system power supply, thereby improving the power supply stability and further improving the working reliability of the electronic trip device.

[0082] In one embodiment, Figure 3 As shown, the electronic trip device also includes a communication module and an RS485 bus module; the first end of the communication module is connected to the third end of the processor, the second end of the communication module is connected to the first end of the RS485 bus module, and the second end of the RS485 bus module is used to connect to the external module.

[0083] Among them, the external module can be a host computer, a remote monitoring center or other equipment with RS485 communication capability, which is used to receive data sent by the processor and send control instructions to the processor. Specifically, the processor can send the collected power data, fault information, switch status and other data to the communication module. After receiving the data, the communication module can further perform necessary format conversion or verification to ensure that the data is accurate and then send it to the external module through the RS485 bus module. After the external module receives the data through the RS485 interface, it extracts key information such as power data, fault information and switch status for display, storage or further processing. In addition, the external module can send control instructions to the electronic trip device according to actual needs, such as remote opening, closing, parameter setting, etc. The control instruction is sent to the communication module through the RS485 bus module, and then forwarded to the processor for execution by the communication module. After receiving the control instruction, the processor performs logical judgment and execution, such as controlling the circuit breaker to open or close. The execution result can also be fed back to the external module through the communication module and the RS485 bus module.

[0084] Furthermore, during the data transmission process, CRC check and other mechanisms can be used to ensure the integrity and correctness of the data during the transmission process. The communication module and processor can also have a built-in error handling mechanism that can identify and handle communication failures, data errors, etc., to improve the stability and reliability of the system.

[0085] The electronic trip device in this embodiment realizes efficient data transmission and control with the external module by setting up the communication module and the RS485 bus module, thereby realizing remote monitoring, control and management of the circuit breaker, which greatly improves the convenience and efficiency of equipment management, and adopts the RS485 bus module for communication, which can further improve the stability and reliability of data transmission.

[0086] In order to further improve the intelligence, maintainability and user interaction capability of the electronic trip device, in one embodiment, Figure 3 As shown, the electronic tripping device also includes a display module 400, a key input module, a storage module, a clock module, a temperature detection module, an operation monitoring module and a debugging module. The display module 400 and the key input module are both connected to the input and output control module. The storage module, the clock module, the temperature detection module, the operation monitoring module and the debugging module can all be connected to the processor.

[0087] The display module 400 can be used to display important information such as the current working status, real-time current and voltage values, fault type (such as overload, short circuit, undervoltage, etc.), remaining protection time, device temperature, etc. Through the intuitive graphic and text interface, users can quickly understand the equipment status, which is convenient for daily inspection and maintenance.

[0088] The key input module may specifically include four function keys, "up" and "down" for parameter adjustment, "left (return / fault reset)" for canceling an operation or clearing a fault state, and "right (confirm)" for confirming a setting or selection. Combined with the guidance of the display module 400, the user can easily query and set various parameters of the circuit breaker, such as current setting value, time delay, etc., and quickly understand and respond to the operating status of the device.

[0089] The storage module has a built-in large-capacity non-volatile memory that can be used to record equipment operation history data, fault events, maintenance records, etc. These data can be exported through the debugging module for technicians to analyze equipment performance, predict potential faults, and optimize system settings, thereby improving system reliability and maintenance efficiency.

[0090] The clock module uses high-precision real-time clock technology and has a built-in high-precision real-time clock, which can accurately record key time points such as fault occurrence time and maintenance operation time. Combined with the data stored in the storage module, a detailed equipment operation log can be generated to help users trace the root cause of the problem and implement effective equipment management strategies.

[0091] The temperature detection module is used to monitor the temperature inside the device and the surrounding environment in real time. When the temperature exceeds the preset threshold, it will automatically trigger an alarm or take protective measures (such as tripping protection, etc.) to ensure that the device operates within a safe temperature range and extend its service life.

[0092] The operation monitoring module is responsible for comprehensively monitoring the operation status of the electronic trip device, including real-time monitoring of electrical parameters such as current, voltage, power factor, and status evaluation of mechanical components such as contacts and springs. Once an abnormality is found, the corresponding protection mechanism will be triggered immediately to prevent equipment damage or safety accidents.

[0093] The debugging module provides a variety of communication interface options (such as RS232 / RS485, USB, Ethernet, etc.), and supports remote configuration, debugging and monitoring functions. With the help of professional software tools, technicians can easily perform operations such as parameter setting, fault diagnosis, and software upgrades, which greatly improves work efficiency and the convenience of system maintenance. In addition, the module also supports seamless integration with the host computer or automation system, laying a solid foundation for achieving higher-level automation control and remote management.

[0094] The electronic trip device in this embodiment significantly improves the intelligence level, operation convenience and maintainability of the electronic trip device by integrating modules such as display, input, storage, clock, temperature detection, operation monitoring and debugging interface. Users can intuitively understand the status of the equipment and respond to faults quickly; technicians can efficiently perform remote configuration, debugging and data analysis to optimize system settings. These functions together enhance the safety performance of the equipment, extend its service life, and promote the stable operation and efficient management of the power system.

[0095] In one embodiment, Figure 5 As shown, the present application also provides a control method for an electronic tripping device, comprising:

[0096] Step S1, obtaining the power measurement result and the electric energy measurement result sent by the electric energy metering module, and sending the power measurement result and the electric energy measurement result to the input and output control module.

[0097] Step S2, obtaining the protection calculation result sent by the protection calculation module.

[0098] Step S3, when the protection calculation result is to generate a protection action, a trip coil activation instruction is sent to the input-output control module; the input-output control module activates the trip coil after receiving the trip coil activation instruction.

[0099] In one embodiment, the control method of the electronic trip device further includes:

[0100] Step S4, obtaining the contact position signal sent by the input and output control module.

[0101] Step S5, determining the current circuit breaker state according to the contact position signal.

[0102] In one embodiment, the control method of the electronic trip device may further include: sending important information such as the current working state, real-time current and voltage values, fault type (such as overload, short circuit, undervoltage, etc.), remaining protection time, and device temperature to the display module for display. Obtaining the circuit breaker setting instruction sent by the key input module, and performing parameter query, parameter setting, cancellation operation, or clearing the fault state according to the circuit breaker setting instruction.

[0103] In order to better understand the electronic tripping device and the control method thereof in the above embodiment, a more detailed embodiment is provided below for illustration.

[0104] In one embodiment, Figure 4As shown, an electronic tripping device is provided, including a resistor voltage divider circuit 210, a second signal conditioning circuit 220, a 16-bit SAR type AD (corresponding to the second analog-to-digital conversion circuit 230 in the above embodiment), an electric energy metering module, a protection calculation module, a current transformer 110 (iron core coil) (corresponding to the current sampling circuit in the above embodiment), a first signal conditioning circuit 120, a PGA (Programmable Gain Amplifier) ​​(corresponding to the gain amplifier circuit 140 in the above embodiment), a 24-bit ∑-Δ type AD (corresponding to the first analog-to-digital conversion circuit 130 in the above embodiment), a processor, an input and output control module, a tripping coil, a liquid crystal display 410, an indicator light 420, a key input, a tripping power supply, a system power supply, a switch position monitoring module, a rectifier filter voltage stabilizing circuit 310, a voltage stabilizing circuit 320, an external interface (for connecting an external module), a communication module, an RS485 bus module, a storage module, an RTC (corresponding to the clock module in the above embodiment), a temperature detection module, an operation monitoring module, and a debugging interface (corresponding to the debugging module in the above embodiment). Among them, SAR type AD, ∑-ΔAD, electric energy metering module, protection calculation module, processor, input and output control module, communication module, storage module, RTC, temperature detection module, operation monitoring module, and debugging interface can be integrated into the controller. The RS485 bus module can use the RS485 bus transceiver of model THVD1500, the storage module can use the memory of model FT24C512, the operation monitoring module can use the monitoring chip of model MAX706RES, and the processor can use the MCU chip of model MKM34Z256. The working principle and function of the electronic tripping device of this embodiment are introduced from the following aspects:

[0105] Current and voltage acquisition: The device has built-in current transformer 110 (iron core coil) and voltage acquisition component (resistance voltage divider circuit 210), which are responsible for the accurate acquisition of circuit breaker current and voltage signals respectively. Current transformer 110 not only participates in the judgment of current protection logic such as overload and short circuit, but also automatically switches to power supply mode when the external power supply is abnormal, ensuring the continuous operation of the protection function. Figure 6The specific structure of the first signal conditioning circuit 120 for current sampling is shown. The first signal conditioning circuit 120 specifically includes an A-phase current signal conditioning circuit, a B-phase current signal conditioning circuit and a C-phase current signal conditioning circuit, wherein the A-phase current signal conditioning circuit includes a resistor R44, a resistor R45, a capacitor C27 and a capacitor C28, the first end of the resistor R44 is connected to the AD_IAP end of the current transformer, the second end of the resistor R44 and the first end of the capacitor C27 are both connected to the ADC_ICP end of the processor, the second end of the capacitor C27 and the first end of the capacitor C28 are both grounded, the second end of the capacitor C28 and the second end of the resistor R45 are both connected to the ADC_ICN end of the processor, and the first end of the resistor R45 is connected to the AD_IAN end of the current transformer. The B-phase current signal conditioning circuit includes resistor R46, resistor R47, capacitor C33 and capacitor C34. The first end of resistor R46 is connected to the AD_IBP terminal of the current transformer, the second end of resistor R46 and the first end of capacitor C33 are both connected to the ADC_IBP terminal of the processor, the second end of capacitor C33 and the first end of capacitor C34 are both grounded, the second end of capacitor C34 and the second end of resistor R47 are both connected to the ADC_IBN terminal of the processor, and the first end of resistor R47 is connected to the AD_IBN terminal of the current transformer. The C-phase current signal conditioning circuit includes resistor R48, resistor R51, capacitor C35 and capacitor C38. The first end of resistor R48 is connected to the AD_IAP end of the current transformer, the second end of resistor R48 and the first end of capacitor C35 are both connected to the ADC_IAP end of the processor, the second end of capacitor C35 and the first end of capacitor C38 are both grounded, the second end of capacitor C38 and the second end of resistor R51 are both connected to the ADC_IAN end of the processor, and the first end of resistor R51 is connected to the AD_IAN end of the current transformer.

[0106] Voltage acquisition is carried out through resistor voltage division and is connected to a high-precision SAR ADC after signal conditioning to provide data support for voltage protection and electric energy measurement. Figure 7The specific structure of the resistor voltage divider circuit 210 and the second signal conditioning circuit 220 is shown. The resistor voltage divider circuit 210 includes an A-phase voltage acquisition circuit, a B-phase voltage acquisition circuit and a C-phase voltage acquisition circuit. The A-phase voltage acquisition circuit includes resistors R1, R2, R3, R4, R5 and R6 connected in series. The first end of the resistor R1 obtains the A-phase voltage signal UA, the second end of the resistor R6 is connected to the first end of the voltage regulator tube Z1, the second end of the voltage regulator tube Z1 is grounded, and AD_UA is the A-phase voltage sampling signal. The B-phase voltage acquisition circuit includes resistors R9, R10, R11, R12, R13 and R14 connected in series. The first end of the resistor R9 obtains the B-phase voltage signal UB, the second end of the resistor R14 is connected to the first end of the voltage regulator tube Z2, the second end of the voltage regulator tube Z2 is grounded, and AD_UB is the B-phase voltage sampling signal. The C-phase voltage acquisition circuit includes a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24 ​​and a resistor R25 connected in series. The first end of the resistor R20 obtains the C-phase voltage signal UC, the second end of the resistor R25 is connected to the first end of the Zener diode Z3, the second end of the Zener diode Z3 is grounded, and AD_UC is the C-phase voltage sampling signal.

[0107] The second signal conditioning circuit 220 includes a filter circuit and an amplifier circuit. The filter circuit includes a resistor R7, a capacitor C1, a resistor R17, a capacitor C3, a resistor R27, a capacitor C12, a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C4. The first end of the resistor R7 and the capacitor C1 are connected to the output end of the A-phase voltage acquisition circuit, that is, the second end of the resistor R6, the first end of the resistor R17 and the capacitor C3 are connected to the output end of the B-phase voltage acquisition circuit, that is, the second end of the resistor R14, and the first end of the resistor R27 and the capacitor C12 are connected to the output end of the C-phase voltage acquisition circuit, that is, the second end of the resistor R25. The second end of the capacitor C1, the second end of the resistor R7, the second end of the resistor R17, the second end of the capacitor C3, the second end of the resistor R27, and the second end of the capacitor C12 are connected to the first end of the capacitor C6, the first end of the capacitor C7, the first end of the capacitor C8 and the first end of the capacitor C4. The second end of the capacitor C6, the second end of the capacitor C7, the second end of the capacitor C8 and the second end of the capacitor C4 are all grounded. The first end of capacitor C4 is connected to VREF / 2 voltage signal. The amplifier circuit includes resistor R19, resistor R8, capacitor C2, amplifier U1, capacitor C9, resistor R26, resistor R18 and capacitor C11. The first end of resistor R19 is connected to the first end of capacitor C4, the second end is connected to the output end of amplifier U1, the first end of capacitor C2 and the first end of resistor R8 are both connected to the inverting input end of amplifier U1, the second end of capacitor C2 and the second end of resistor R8 are both connected to the output end of amplifier U1, the first end of capacitor C9, the first end of resistor R26 and the second end of resistor R18 are all connected to the in-phase input end of amplifier U1, the second end of capacitor C9, the second end of resistor R26 and the second end of capacitor C11 are all grounded, and the first end of resistor R18 and the first end of capacitor C11 are both connected to VREF voltage signal. Among them, the specific model of amplifier U1 can be LMV771.

[0108] Signal processing and amplification: In order to meet the high-precision measurement requirements under different current ranges, the device introduces a programmable gain amplifier (PGA). The PGA dynamically adjusts the gain according to the current size to ensure that the analog signal is close to but not exceeding the AD full scale range, thereby ensuring the measurement accuracy under low current while also ensuring the protection accuracy under high current.

[0109] Core control and calculation: The input and output control module includes a trip circuit, which is used to activate the trip coil after receiving a trip coil activation command. Figure 8It is a structural schematic diagram of a tripping circuit, including capacitor C29, capacitor C30, capacitor C31, capacitor C32, capacitor C37, resistor R49, resistor R50, switch tube V1, diode D1, diode D2 and connector J2, the first ends of capacitors C29, capacitor C30, capacitor C31 and capacitor C32 are all connected to the first end of diode D2, and the second ends are all grounded; the first end of diode D1 is connected to the VCC_M voltage signal, the second end is connected to the first end of diode D2, the second end of diode D2 is connected to the first end of the switch tube, and the second end of the switch tube is grounded, the first end of resistor R49 is connected to the CPU_TK end of the processor to obtain a tripping coil activation instruction, the second end of resistor R49, the first end of capacitor C37 and the first end of resistor R50 are all connected to the control end of the switch tube, the second end of capacitor C37 and the second end of resistor R50 are all grounded; pin 1 of connector J2 is connected to the first end of diode D2, pin 2 is connected to the first end of switch tube V1, pins 3 and 4 are both grounded, and pins 1 and 2 of connector J2 are both connected to the tripping coil. The controller uses Freescale's KM34 SOC with metering function as the control core, and integrates a multi-channel AD converter (including 24-bit Σ-ΔAD and 16-bit SAR AD), realizing the dual functions of metering sampling and protection sampling. The controller is not only responsible for data analog-to-digital conversion, power metering and protection calculation, but also monitors peripherals such as LCD display 410, indicator light 420, key input, trip coil and communication module to ensure the coordinated operation of the entire system.

[0110] Human-computer interaction and communication: The device is equipped with an intuitive LCD display and four-way buttons. The four-way buttons include "up", "down", "left (return / fault reset)", and "right (confirm)". By cooperating with the information on the LCD display 410, the parameters and operating status of the circuit breaker can be queried and set. Users can easily view the circuit breaker operating parameters (such as current current, voltage, power, electric energy, etc.), fault information, etc., and perform parameter setting and information query. Fig. 9It is a schematic diagram of the structure of the key circuit, including key K1 (key "up"), capacitor C15, resistor R36, K2 (key "down"), capacitor C17, resistor R38, K3 (key "left"), capacitor C22, resistor R39, K4 (key "right"), capacitor C23 and resistor R41. The first end of capacitor C15 and the first end of resistor R36 are connected to the first end of button K1, the first end of capacitor C17 and the first end of resistor R38 are connected to the first end of button K2, the first end of capacitor C22 and the first end of resistor R39 are connected to the first end of button K3, the first end of capacitor C23 and the first end of resistor R41 are connected to the first end of button K4, the second end of resistor R36, the second end of resistor R38, the second end of resistor R39 and the second end of resistor R41 are connected to V3P3 (3.3V voltage signal), the second end of capacitor C15, the second end of capacitor C17, the second end of capacitor C22, the second end of capacitor C23, the first end of button K1, the first end of button K2, the first end of button K3 and the first end of button K4 are grounded. In addition, through the RS485 bus communication module, the device supports remote communication with external modules to realize remote control, parameter setting, information reporting and shunt action, auxiliary alarm and other functions, which greatly improves the maintainability and intelligence level of the system. At the same time, there are four indicator lights 420, namely, an operation indicator light (displaying the current operating status of the circuit breaker), a heavy load pre-warning indicator light (early warning when approaching the overload threshold), an overload alarm indicator light (lights up when an overload occurs) and a communication indicator light (indicating the communication status). These indicators provide users with intuitive equipment status feedback.

[0111] Safety monitoring and status feedback: The independent switch position monitoring module consists of two travel switches, which monitor the closing, opening and free tripping positions of the circuit breaker contacts in real time. Specifically, the first travel switch can be installed at a specific position of the closing path of the circuit breaker contacts. When the circuit breaker contacts are fully closed to the closing position, the contacts or the mechanism connected thereto will trigger the travel switch. The second travel switch can be installed at an appropriate position of the circuit breaker contact opening path or free tripping path, which can not only monitor the opening status of the circuit breaker contacts, but also send a signal in time when the circuit breaker is free tripping. Fig.10It is a structural diagram of the switch position monitoring module, including connector J1, resistor R15, resistor R16, capacitor C5, capacitor C10 and two travel switches (not shown in the figure), the first end of resistor R15 and resistor R16 is connected to V3P3 (3.3V voltage signal), the second end of resistor R15 is connected to the first end of capacitor C5, the second end of resistor R16 is connected to the first end of capacitor C10, the second end of capacitor C5 and the second end of capacitor C10 are both grounded, pin 1 and pin 4 of connector J1 are both grounded, pin 2 and the second end of resistor R15 are both connected to the YX_FZ end of the processor, and pin 5 and the second end of resistor R16 are both connected to the YX_TZ end of the processor. Pins 1 and 2 of connector J1 are connected to the first travel switch (not shown in the figure), and pins 4 and 5 are connected to the second travel switch (not shown in the figure). This design not only provides accurate circuit breaker status information for the electronic trip unit, but also verifies whether the action is successful after the trip action, and transmits the status information to the external display unit through communication, and the external display unit provides a number of auxiliary and alarm output signals to realize rapid diagnosis and processing of faults. In summary, the electronic trip device in this embodiment only needs to use a set of mutual inductors and can realize metering and protection, so that the circuit breaker structure volume is reduced.

[0112] The electronic tripping device in this embodiment only needs one controller, namely, a SOC chip, to realize metering protection, without the need for an additional external metering and management chip, thereby streamlining the overall circuit, reducing the size of the circuit board, improving working reliability and reducing the overall cost.

[0113] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An electronic tripping device, characterized in that: It includes a current sampling module, a voltage sampling module, an electric energy metering module, a protection calculation module, a processor, an input-output control module, a tripping coil, a tripping power supply and a system power supply; the current sampling module and the voltage sampling module are both connected to the first end of the electric energy metering module, the second end of the electric energy metering module is connected to the first end of the processor, the current sampling module and the voltage sampling module are both connected to the first end of the protection calculation module, the second end of the protection calculation module is connected to the first end of the processor, the second end of the processor is connected to the first end of the input-output control module, the second end of the input-output control module is connected to the first end of the tripping coil, the second end of the tripping coil is connected to the first end of the tripping power supply, and the second end of the tripping power supply and the system power supply are both connected to the current sampling module; The current sampling module is used to collect the current signal of the circuit breaker and send the current signal to the electric energy metering module and the protection calculation module; The voltage sampling module is used to collect the voltage signal of the circuit breaker and send the voltage signal to the electric energy metering module and the protection calculation module; The electric energy metering module is used to calculate the current signal and the voltage signal to obtain a power measurement result and an electric energy measurement result; The protection calculation module is used to calculate the current signal and the voltage signal to obtain a protection calculation result; The processor is used to perform sampling control on the electric energy metering module to obtain the power measurement result and the electric energy measurement result, and send the power measurement result and the electric energy measurement result to the input and output control module; The processor is also used to perform sampling control on the protection calculation module to obtain the protection calculation result, and send a trip coil activation instruction to the input-output control module when the protection calculation result is to generate a protection action; The input-output control module is used to activate the trip coil after receiving the trip coil activation instruction.

2. The electronic tripping device according to claim 1, characterized in that: The current sampling module includes a current transformer, a first signal conditioning circuit and a first analog-to-digital conversion circuit, the first end of the current transformer is connected to the first end of the first signal conditioning circuit, the second end of the first signal conditioning circuit is connected to the first end of the first analog-to-digital conversion circuit, the electric energy metering module and the protection calculation module are both connected to the second end of the first analog-to-digital conversion circuit; the second end of the trip power supply and the system power supply are both connected to the second end of the current transformer; The current transformer is used to collect the current signal of the circuit breaker and send the current signal to the first signal conditioning circuit; The first signal conditioning circuit is used to preprocess the current signal and send the preprocessed current signal to the first analog-to-digital conversion circuit; The first analog-to-digital conversion circuit is used to sample the preprocessed current signal to obtain current data of the circuit breaker, and send the current data to the electric energy metering module and the protection calculation module.

3. The electronic tripping device according to claim 2, characterized in that: The current sampling module further includes a gain amplifier circuit, the second end of the first signal conditioning circuit is connected to the first end of the gain amplifier circuit, and the second end of the gain amplifier circuit is connected to the first end of the first analog-to-digital conversion circuit; The gain amplifier circuit is used to amplify the preprocessed current signal and transmit it to the first analog-to-digital conversion circuit.

4. The electronic tripping device according to claim 1, characterized in that: The voltage sampling module includes a resistor voltage divider circuit, a second signal conditioning circuit and a second analog-to-digital conversion circuit, wherein a first end of the resistor voltage divider circuit is connected to the N line, a second end of the resistor voltage divider circuit is connected to a first end of the second signal conditioning circuit, a second end of the second signal conditioning circuit is connected to a first end of the second analog-to-digital conversion circuit, and both the electric energy metering module and the protection calculation module are connected to a second end of the second analog-to-digital conversion circuit; The resistor voltage divider circuit is used to collect the voltage signal of the circuit breaker and send the voltage signal to the second signal conditioning circuit; The second signal conditioning circuit is used for preprocessing the voltage signal and sending the preprocessed voltage signal to the second analog-to-digital conversion circuit; The second analog-to-digital conversion circuit is used to sample the preprocessed voltage signal to obtain voltage data of the circuit breaker, and send the voltage data to the electric energy metering module and the protection calculation module.

5. The electronic tripping device according to claim 1, characterized in that: The device further comprises a switch position monitoring module, wherein the switch position monitoring module is connected to the third terminal of the input-output control module; The switch position monitoring module is used to send a contact position signal to the input-output control module, and the input-output control module sends the contact position signal to the processor; the processor is also used to determine the current circuit breaker state according to the contact position signal.

6. The electronic tripping device according to claim 1, characterized in that: The device further comprises a voltage stabilizing module, the current sampling module is connected to a first end of the voltage stabilizing module, and the second end of the trip power supply and the system power supply are both connected to the second end of the voltage stabilizing module.

7. The electronic tripping device according to claim 1, characterized in that: The device also includes a communication module and an RS485 bus module; the first end of the communication module is connected to the third end of the processor, the second end of the communication module is connected to the first end of the RS485 bus module, and the second end of the RS485 bus module is used to connect to an external module.

8. The electronic tripping device according to claim 1, characterized in that: The device also includes a display module, a key input module, a storage module, a clock module, a temperature detection module, an operation monitoring module and a debugging module.

9. A control method for an electronic tripping device, characterized in that: The method comprises: Step S1, obtaining a power measurement result and an electric energy measurement result sent by an electric energy metering module, and sending the power measurement result and the electric energy measurement result to an input / output control module; Step S2, obtaining the protection calculation result sent by the protection calculation module; Step S3, when the protection calculation result is to generate a protection action, sending a trip coil activation instruction to the input-output control module; the input-output control module activates the trip coil after receiving the trip coil activation instruction.

10. The control method of the electronic tripping device according to claim 9, characterized in that: The method further comprises: Step S4, obtaining a contact position signal sent by the input / output control module; Step S5, determining the current circuit breaker state according to the contact position signal.

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