Embedded power distribution network line fault electrical quantity recording device

Abstract

The invention relates to an embedded power distribution network line fault electrical quantity recording device which is composed of a master control SOC unit, an analog signal acquisition unit, a switching value signal control unit and a system power supply unit, and can acquire voltage and current analog signals, output digital signals to the master control unit through analog-to-digital conversion, and simultaneously output the digital signals to the master control unit. The control unit can execute switch closing or opening operation and monitor the state of the switch. The whole device is powered by the system power supply unit and is used for recording and analyzing power distribution network line fault electrical quantity. The device is simple and convenient to use and can realize on-line fault electrical quantity recording.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution networks, and in particular to an embedded power distribution network line fault electrical quantity recording device. Background Art

[0002] Distribution networks are generally only equipped with electrical quantity protection devices. When a line fails, there is no special device to record the voltage, current, switch status and other electrical quantity information at the time of the fault, which makes subsequent fault cause analysis and troubleshooting extremely difficult. Therefore, it is imperative to install online fault electrical quantity recording devices dedicated to analog quantity information such as voltage and current, as well as switch quantity information such as switch and knife switch position in the distribution network.

[0003] However, the existing fault waveform recording devices are generally dedicated to substations and power plants, with many analog and switch channels (generally at least 64 analog channels), large size, and generally equipped with a transformer box to access analog signals, requiring a stable 220V DC or AC power supply. They do not meet the requirements of limited analog channels of the distribution network (generally only 24 channels or even less), limited installation space, and only 24V power supply.

[0004] Therefore, it is necessary to design a distribution network line fault electrical quantity recording device specifically for the specific requirements of the distribution network. Summary of the invention

[0005] The purpose of the present application is to provide an embedded distribution network line fault electrical quantity recording device, which is easy to use and can realize online fault electrical quantity recording.

[0006] To achieve the above-mentioned object, the present application provides an embedded distribution network line fault electrical quantity recording device including a main control SOC unit and an analog signal acquisition unit, a switch quantity signal control unit and a system power supply unit connected to the main control SOC unit;

[0007] The analog signal acquisition unit includes a voltage signal sampling subunit and a current signal sampling subunit;

[0008] The voltage signal sampling subunit is used to receive the power distribution network line voltage analog signal input from the voltage input terminal, and to sample and perform analog-to-digital conversion on the voltage analog signal to obtain a voltage digital signal, and output the voltage digital signal to the main control SOC unit;

[0009] The current signal sampling subunit is used to receive the power distribution network line current analog signal input by the current clamp input terminal, and to sample and perform analog-to-digital conversion on the current analog signal to obtain a current digital signal, and output the current digital signal to the main control SOC unit;

[0010] The switch signal control unit is used to receive the control signal sent by the main control SOC unit, control the power distribution network line switch to close or open according to the control signal, and is also used to receive the switch state signal of the power distribution network line switch collected by the switch signal collection unit, and output the switch state signal to the main control SOC unit;

[0011] The system power supply unit is used to provide working power for the main control SOC unit, the analog signal acquisition unit, and the switch signal control unit.

[0012] The device of the present application solves the problems raised in the background technology in the following ways:

[0013] (1) The device is specially designed for the needs of the distribution network and usually requires only 24 or even fewer analog channels. Compared with existing fault waveform recording devices, it greatly simplifies the complexity of the system.

[0014] (2) The device can collect electrical quantity information such as voltage, current, and switch status of the distribution network line in real time and convert it into digital signals to realize electrical quantity recording at the time of fault.

[0015] (3) The switch signal control unit is integrated in the device and can directly control the closing or opening of the switch of the distribution network line and collect the switch status signal at the same time, which simplifies the design and installation of the system.

[0016] (4) The device adopts an embedded design with the main control SOC unit as the core, and various functions are realized through software programming, which improves the flexibility and scalability of the system.

[0017] Through these design features, the above-mentioned device can meet the needs of online fault electrical quantity recording in the distribution network, solve the problems mentioned in the background technology, and provide important data support for fault analysis and problem troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a structural diagram of an embedded distribution network line fault electrical quantity recording device in an embodiment of the present application.

[0020] Figure 2 Schematic diagram of the voltage signal sampling subunit in the embodiment of the present application.

[0021] Figure 3 Schematic diagram of the current signal sampling subunit in the embodiment of the present application.

[0022] Figure 4 Schematic diagram of a system power supply unit in an embodiment of the present application. DETAILED DESCRIPTION

[0023] See also Figure 1 , an embodiment of the present application provides an embedded distribution network line fault electrical quantity recording device, including a main control SOC unit and an analog signal acquisition unit, a switch quantity signal control unit and a system power supply unit connected to the main control SOC unit;

[0024] The analog signal acquisition unit includes a voltage signal sampling subunit and a current signal sampling subunit;

[0025] The voltage signal sampling subunit is used to receive the distribution network line voltage analog signal input by the voltage input terminal, and to reduce the voltage, sample and convert the voltage analog signal into an analog-to-digital signal to obtain a voltage digital signal, and output the voltage digital signal to the main control SOC unit; specifically, the voltage signal sampling subunit receives the distribution network line voltage analog signal input by the voltage input terminal, and the voltage input terminal is connected to the high-voltage line through a wire. The voltage signal sampling subunit reduces the voltage and samples the received voltage analog signal, that is, samples the signal at a certain time interval, and then converts these sampled values ​​into digital signals. This process is called analog-to-digital conversion (A / D conversion), which is the process of converting an analog signal into a digital signal. The converted voltage digital signal is output to the main control SOC unit. The main control SOC unit is the core of the entire device, which is responsible for processing and managing the work of each unit, including storage, analysis, communication and other functions.

[0026] The current signal sampling subunit is used to receive the distribution network line current analog signal input by the current clamp input terminal, and to sample and convert the current analog signal into a current digital signal, and output the current digital signal to the main control SOC unit; specifically, the current signal sampling subunit receives the distribution network line current analog signal input by the current clamp input terminal, and the current clamp input terminal is connected to the current clamp through a wire. The "current clamp" here is a device specially used to measure high currents. It can be clamped on a high-voltage line to convert the high current signal into a low current signal that can be processed by the current signal sampling subunit. The current signal sampling subunit samples the received current analog signal, that is, samples the signal at a certain time interval, and then converts these sampled values ​​into digital signals. This process is called analog-to-digital conversion (A / D conversion), which is the process of converting an analog signal into a digital signal. The converted current digital signal is output to the main control SOC unit. The switch signal control unit is used to receive the control signal issued by the main control SOC unit, control the distribution network line switch to close or open according to the control signal, and is also used to receive the switch state signal of the distribution network line switch collected by the switch signal acquisition unit, and output the switch state signal to the main control SOC unit; specifically, the switch signal control unit can receive the control signal issued by the main control SOC unit (System on Chip). These control signals may come from user operations, remote control centers or other control systems. According to the received control signal, the switch signal control unit can control the switch on the distribution network line to close or open. Closing means closing the switch to allow current to pass; opening means disconnecting the switch to cut off the current. The switch signal control unit is also responsible for receiving the switch state signal of the distribution network line switch collected by the switch signal acquisition unit. These signals reflect the actual state of the switch and are important data for fault analysis and system monitoring. The switch signal control unit outputs the received switch state signal to the main control SOC unit. The main control SOC unit can use these signals for fault analysis, state monitoring, control decision-making, etc. The system power supply unit is used to provide working power for the main control SOC unit, the analog signal acquisition unit, and the switch signal control unit; specifically, the system power supply unit provides working power for the main control SOC unit. The main control SOC unit is the core of the entire device, responsible for processing and managing the work of each unit, including storage, analysis, communication and other functions. The system power supply unit also provides working power for the analog signal acquisition unit. The analog signal acquisition unit is responsible for collecting the voltage and current analog signals of the distribution network line and performing corresponding processing. The system power supply unit also provides working power for the switch signal control unit. The switch signal control unit is responsible for controlling the closing or opening operation of the distribution network line switch and collecting the switch status signal.The system power supply unit may also include a power management function to ensure that each unit can work stably and reliably, and it may include functions such as power conversion, voltage stabilization, overload protection, etc. Furthermore, it also includes a status indicator light, which is connected to the main control SOC unit and is used to receive a status indication signal output by the main control SOC unit and light up according to the status indication signal; wherein the light indication includes at least indicating a normal state and indicating a fault state.

[0027] Specifically, the status indicator light is connected to the main control SOC unit and is able to receive status indication signals output by the main control SOC unit. These signals may contain operating status information of the device, such as normal operation, fault detection, etc. The status indicator light indicates according to the received status indication signal, which means that the on and off state and color (if different color lights are used) of the status indicator light will change according to the state of the device. The lighting indication includes at least indicating a normal state and indicating a fault state. When the device is operating normally, the status indicator light will display an indication of a normal state; when the device detects a fault, the status indicator light will display an indication of a fault state. The design of the status indicator light allows the user to intuitively understand the operating status of the device without having to open the device or use other devices to query the status.

[0028] The status indicator light provides a convenient visual feedback mechanism for users to quickly identify the operating status of the device through the connection with the main control SOC unit and the reception of status indication signals.

[0029] The process by which the main control SOC unit determines whether a fault occurs based on the voltage digital signal, current digital signal and switch status signal of the distribution network line is as follows:

[0030] The main control SOC unit receives data such as voltage digital signals, current digital signals, switch status signals, etc., and processes and analyzes these data, including calculating the effective value, peak value, frequency and other parameters of voltage and current, as well as real-time monitoring of switch status. The main control SOC unit analyzes the processed data according to the preset fault detection algorithm and threshold. If it is detected that the voltage, current or switch status exceeds the preset normal range, or an abnormal mode occurs, such as an imbalance of voltage and current, a sudden change in the switch status, etc., the main control SOC unit may determine that it is a fault. The main control SOC unit determines whether a fault has occurred based on the fault detection results. If it is judged to be a fault, an alarm is triggered, and the corresponding status indication signal is output to control the status indicator light to indicate the fault status to notify the operator or automatically execute protection measures, such as cutting off the faulty circuit or starting the backup equipment.

[0031] The main control SOC unit records the voltage, current, switch status and other electrical quantity information at the time of the fault and stores it in the storage device. It can also send this information to the monitoring center or other electronic equipment through the communication interface for further fault analysis. In this way, the main control SOC unit can monitor the operating status of the distribution network line in real time, detect and judge faults in time, and provide important data support for fault analysis and troubleshooting.

[0032] Furthermore, it also includes a touch display screen, which is connected to the main control SOC unit, and is used to receive display data output by the main control SOC unit and display the display data; it is also used to receive operation instructions input by the user and output the operation instructions to the main control SOC unit; wherein the display data at least includes the voltage digital signal, the current digital signal and the switch status signal.

[0033] Specifically, the touch display screen is connected to the main control SOC unit and can receive display data output by the main control SOC unit. These display data may include voltage digital signals, current digital signals and switch status signals, as well as any other relevant electrical quantity information. The touch display screen is capable of displaying the received display data and providing intuitive visual feedback to the user. This allows the user to view key parameters such as voltage, current and switch status, as well as any abnormal conditions in real time. The touch display screen also has the function of receiving operation instructions input by the user. The user can input instructions by touching the screen, such as starting / stopping recording, setting thresholds, viewing historical data, etc. The touch display screen outputs the received user operation instructions to the main control SOC unit. The main control SOC unit performs corresponding operations according to these instructions, such as adjusting device settings, controlling switch status, etc.

[0034] Furthermore, it also includes an Ethernet module, which is connected to the main control SOC unit and is used to provide an Ethernet interface for connecting the main control SOC unit with external devices.

[0035] Specifically, the Ethernet module is connected to the main control SOC unit and provides an Ethernet interface for the device, which means that the main control SOC unit can transmit data with other external devices through the Ethernet module. The Ethernet module is responsible for processing network communication protocols, such as TCP / IP, to ensure that the device can communicate effectively with other network devices. Through the Ethernet module, the device can achieve remote access and control, such as remote monitoring, fault diagnosis, data upload and download, etc. The Ethernet module enables the device to synchronize data with other network devices and realize data sharing, such as data exchange with a monitoring center or other equipment. The Ethernet module can serve as a bridge for the integration of the device with other systems, such as data exchange with other monitoring systems, SCADA systems, etc.

[0036] Therefore, the Ethernet module provides a network communication interface for the device, enabling the device to transmit data and remotely access other devices, which is essential for achieving remote monitoring, fault diagnosis and system integration.

[0037] Furthermore, it also includes a USB module, which is connected to the main control SOC unit, and the USB is used to provide a USB interface for connecting the main control SOC unit with a storage device or other electronic devices.

[0038] Specifically, the USB module is connected to the main control SOC unit to provide a USB interface for the device. This means that the main control SOC unit can transmit data to other external devices through the USB module. The USB module can be used to connect external storage devices, such as USB flash drives, hard drives, etc., for data backup, storage and transmission. The USB module can also be used to connect other electronic devices, such as computers, mobile devices, etc., to achieve data sharing and interaction. The USB interface provides a convenient way to transfer data. Users can directly connect the device to external devices via a USB cable without the need for complex network configuration. The USB module can serve as a bridge for the integration of the device with other devices, such as connection with other data processing devices, control devices, etc.

[0039] Therefore, the USB module provides a convenient data transmission and device connection interface for the device, enabling the device to transfer data and interact with other storage devices and other electronic devices, which is essential for data backup, device integration and field operation.

[0040] Furthermore, the voltage signal sampling subunit includes an A-phase voltage signal sampling subunit, a B-phase voltage signal sampling subunit and a C-phase voltage signal sampling subunit:

[0041] like Figure 2 As shown, the A-phase voltage signal sampling subunit, the B-phase voltage signal sampling subunit and the C-phase voltage signal sampling subunit all include:

[0042] The high-voltage resistor divider module is used to receive the distribution network line voltage analog signal input by the voltage input terminal, and convert the distribution network line voltage analog signal into a voltage analog signal within the safe voltage level range by using the resistor divider form; specifically, the high voltage signal is converted into a low voltage signal to avoid safety risks to equipment and operators; it should be noted that the external voltage signal is used in the form of resistor divider instead of voltage transformer, which can reduce the size of the equipment. This is because the resistor divider is usually composed of several resistors, with a simple structure and small size, which saves the layout of the transformer box. Traditional voltage transformers are usually larger in size due to their working principles and the safety standards that need to be met.

[0043] An input signal buffer is used to perform signal conditioning on the voltage analog signal within the safety voltage level range; specifically, pre-process the signal to ensure signal quality and prepare for subsequent analog-to-digital conversion;

[0044] The voltage analog-to-digital conversion module is used to perform analog-to-digital conversion on the voltage analog signal after signal conditioning to obtain a voltage digital signal; specifically, the analog signal is converted into a digital signal to facilitate subsequent digital signal processing and analysis;

[0045] The voltage digital isolation module is used to output the voltage digital signal to the main control SOC unit; specifically, it provides electrical isolation to ensure the security and reliability of data transmission.

[0046] Furthermore, the high-voltage resistor voltage divider module includes a first voltage terminal (connected to phase A / phase B / phase C of the transmission line), a second voltage terminal (connected to the neutral line of the transmission line), a first voltage divider resistor, a second voltage divider resistor, a first operational amplifier and a first output load resistor; the first voltage terminal is connected to the first end of the first voltage divider resistor, the second voltage terminal is connected to the first end of the second voltage divider resistor, the second end of the first voltage divider resistor is connected to the second end of the second voltage divider resistor, the connection between the second end of the first voltage divider resistor and the second end of the second voltage divider resistor is connected to the in-phase input of the first operational amplifier, the inverting input of the first operational amplifier is connected to the output of the first operational amplifier, the output of the first operational amplifier is connected to the first end of the first output load resistor, the second end of the first output load resistor is grounded, and the output of the first operational amplifier is connected to the input signal buffer.

[0047] Furthermore, the current signal sampling subunit includes: an A-phase current signal sampling subunit, a B-phase current signal sampling subunit and a C-phase current signal sampling subunit:

[0048] like Figure 3 As shown, the A-phase current signal sampling subunit, the B-phase current signal sampling subunit and the C-phase current signal sampling subunit all include:

[0049] The input filter circuit is used to receive the distribution network line current analog signal input by the current clamp input terminal and filter the distribution network line current analog signal; specifically, the distribution network line current analog signal is filtered to remove noise and interference to ensure the accuracy of the current signal. The current clamp is a current transformer.

[0050] The differential amplifier circuit is used to convert the filtered two-end current analog signal into a single-end current analog signal acceptable to the analog-to-digital converter; specifically, the two-end signal is converted into a single-end signal to meet the input requirements of the analog-to-digital converter;

[0051] A current analog-to-digital converter, used to perform analog-to-digital conversion on the single-ended current analog signal to obtain a current digital signal; specifically, converting the analog signal into a digital signal to facilitate subsequent digital signal processing and analysis;

[0052] The current digital isolator is used to output the current digital signal to the main control SOC unit; specifically, to provide electrical isolation to ensure the security and reliability of data transmission.

[0053] Furthermore, the differential amplifier circuit includes a first resistor AR1, a second resistor AR2, a third resistor AR3, a fourth resistor AR4, a current operational amplifier IC2, and a second output load resistor; the current transformer is embedded with a sampling resistor ARs, and the two ends of the sampling resistor ARs are respectively connected to the first current terminal IA and the second current terminal IA', the first current terminal IA is also connected to the first end of the first resistor AR1, the second current terminal IA' is also connected to the first end of the third resistor AR3, the second end of the first resistor AR1 is connected to the first end of the second resistor AR2, the second end of the second resistor is connected to the output end of the current operational amplifier IC2, and the third resistor ARs is connected to the output end of the current operational amplifier IC2. The second end of the first resistor AR1 and the second resistor AR2 are connected to the inverting input end of the current operational amplifier IC2, and the connection between the third resistor AR3 and the fourth resistor AR4 is connected to the same-direction input end of the current operational amplifier IC2; the first resistor AR1, the second resistor AR2, the third resistor AR3, and the fourth resistor AR4 form a differential amplifier, and the output end IA_INP of the current operational amplifier IC2 is connected to the current analog-to-digital converter.

[0054] Further, the input filter circuit includes a common-mode inductor L1, a bidirectional diode D1, a first capacitor C4, a second capacitor C3, a third capacitor C5, a fifth resistor R1, a sixth resistor R3 and a seventh resistor R2, a first end 1 of the common-mode inductor L1 is connected to the first current wiring terminal, a second end 2 of the common-mode inductor L1 is connected to the second current wiring terminal, a third end 3 of the common-mode inductor L1 is connected to the first end of the fifth resistor R1, a fourth end 4 of the common-mode inductor L1 is connected to the first end of the sixth resistor R3, a second end of the fifth resistor R1 is connected to the first end of the bidirectional diode D1, a second end of the sixth resistor R3 is connected to the second end of the bidirectional diode D1, the bidirectional diode D1 is connected to the first capacitor C4 in parallel, a first end of the first capacitor C4 is connected to the first end of the second capacitor C3, a second end of the second capacitor C3 is grounded, a second end of the first capacitor C4 is connected to the first end of the third capacitor C5, a second end of the third capacitor C5 is grounded, and the seventh resistor R2 is connected to the first capacitor C4 in parallel; a first end of the first capacitor C4 is connected to the first end of the first resistor, and a second end of the first capacitor C4 is connected to the first end of the third resistor.

[0055] Furthermore, the switch signal control unit includes a photoelectric coupling switch input circuit and a relay output circuit, the relay output circuit is used to receive the control signal issued by the main control SOC unit, and control the distribution network line switch to close or open according to the control signal, and the photoelectric coupling switch input circuit is used to receive the switch status signal of the distribution network line switch collected by the switch signal collection unit, and output the switch status signal to the main control SOC unit.

[0056] Furthermore, the system power supply unit includes a power interface, an overvoltage and overcurrent protection circuit and a step-down switching converter. The power interface is used to connect to a 10-36V wide-voltage DC power supply. The 10-36V wide-voltage DC power supply passes through the overvoltage and overcurrent protection circuit and is then input into the step-down switching converter for step-down conversion into a power supply voltage that meets the working power requirements of different units.

[0057] Specifically, if Figure 4 As shown, an external 10-36V wide voltage DC power supply is firstly connected to the overvoltage and overcurrent protection circuit, and then converted into 5V power supply by a 5V step-down switching converter. The 5V power supply is used for: system SOC unit, USB, and display interface power supply.

[0058] The power supply of the 3.3V switching power converter also comes from the above system 5V power supply.

[0059] The 3.3V power output is used to power digital chips other than the system SOC unit.

[0060] The 2.5V switching power converter is also powered by the 5V power supply of the system. The 2.5V power supply is used to power the Ethernet physical layer controller interface circuit.

[0061] Both the voltage isolation power supply and the current isolation power supply are provided by three power supplies: 5V, +15V and -15V. The 5V output comes from an isolated 5V to 5V switching power supply module.

[0062] The +15V and -15V outputs come from a 5V to +15 and -15V switching power supply module.

[0063] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An embedded distribution network line fault electrical quantity recording device, It is characterized in that It includes a main control SOC unit and an analog signal acquisition unit, a switch signal control unit and a system power supply unit connected to the main control SOC unit; The analog signal acquisition unit includes a voltage signal sampling subunit and a current signal sampling subunit; The voltage signal sampling subunit is used to receive the power distribution network line voltage analog signal input from the voltage input terminal, and to sample and perform analog-to-digital conversion on the voltage analog signal to obtain a voltage digital signal, and output the voltage digital signal to the main control SOC unit; The current signal sampling subunit is used to receive the power distribution network line current analog signal input by the current clamp input terminal, and to sample and perform analog-to-digital conversion on the current analog signal to obtain a current digital signal, and output the current digital signal to the main control SOC unit; The switch signal control unit is used to receive the control signal sent by the main control SOC unit, control the power distribution network line switch to close or open according to the control signal, and is also used to receive the switch state signal of the power distribution network line switch collected by the switch signal collection unit, and output the switch state signal to the main control SOC unit; The system power supply unit is used to provide working power for the main control SOC unit, the analog signal acquisition unit, and the switch signal control unit.

2. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that It also includes a status indicator light, which is connected to the main control SOC unit and is used to receive a status indication signal output by the main control SOC unit and light up according to the status indication signal; wherein the light up indication includes at least indicating a normal state and indicating a fault state.

3. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that It also includes a touch display screen, which is connected to the main control SOC unit and is used to receive display data output by the main control SOC unit and display the display data; it is also used to receive operation instructions input by a user and output the operation instructions to the main control SOC unit; wherein the display data at least includes the voltage digital signal, the current digital signal and the switch status signal.

4. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that It also includes an Ethernet module, which is connected to the main control SOC unit and is used to provide an Ethernet interface for connecting the main control SOC unit with external devices.

5. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that It also includes a USB module, which is connected to the main control SOC unit. The USB is used to provide a USB interface for connecting the main control SOC unit with a storage device or other electronic devices.

6. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that The voltage signal sampling subunit comprises: A high-voltage resistor voltage-dividing network module is used to receive the distribution network line voltage analog signal input by the voltage input terminal, and convert the distribution network line voltage analog signal into a voltage analog signal within a safe voltage level range by using a resistor voltage-dividing form; An input signal buffer, used for performing signal conditioning on a voltage analog signal within the safety voltage level range; A voltage analog-to-digital conversion module is used to perform analog-to-digital conversion on the voltage analog signal after signal conditioning to obtain a voltage digital signal; The voltage digital isolation module is used to output the voltage digital signal to the main control SOC unit.

7. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that The current signal sampling subunit comprises: An input filter circuit, used for receiving the power distribution network line current analog signal input by the current clamp input terminal, and filtering the power distribution network line current analog signal; A differential amplifier circuit, used for converting the filtered two-terminal current analog signal into a single-terminal current analog signal acceptable to the analog-to-digital converter; A current analog-to-digital converter, used for performing analog-to-digital conversion on the single-ended current analog signal to obtain a current digital signal; The current digital isolator is used to output the current digital signal to the main control SOC unit.

8. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that The switch signal control unit includes a photoelectric coupling switch input circuit and a relay output circuit. The relay output circuit is used to receive the control signal issued by the main control SOC unit, and control the distribution network line switch to close or open according to the control signal. The photoelectric coupling switch input circuit is used to receive the switch status signal of the distribution network line switch collected by the switch signal collection unit, and output the switch status signal to the main control SOC unit.

9. The embedded distribution network line fault electrical quantity recording device according to claim 1, It is characterized in that The system power supply unit includes a power interface, an overvoltage and overcurrent protection circuit and a step-down switching converter. The power interface is used to connect to a 10-36V wide-voltage DC power supply. The 10-36V wide-voltage DC power supply passes through the overvoltage and overcurrent protection circuit and is then input into the step-down switching converter for step-down conversion into a power supply voltage that meets the working power requirements of different units.

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