CN115343560A - Testing arrangement of distribution network relay protection - Google Patents

Abstract

The invention provides a test device for relay protection of distribution network, including an interface board, which is used to connect with external devices through a plurality of external communication interfaces, and perform switching value output or input, current output, voltage output and DC output ; The power amplifier board is used to isolate the current or voltage of the connected relay, and to amplify the voltage power and current power; the main control board is used to generate corresponding control signals according to the received signals; according to the interface board and the power supply The signal input by the power amplifier board checks the relay; the display button board is used to input the corresponding function command and display the output inspection result; the power adapter is used to supply power; When the adapter is not supplying power, it supplies power. The invention can avoid many inconveniences such as needing a generator or a mobile power supply car, and requiring multiple people to carry it, and solves the problem of no test power supply during the acceptance check before power transmission of the switchgear or during power failure maintenance.

Description

A test device for distribution network relay protection

technical field

The invention relates to the technical field of testing relay protection for distribution networks, in particular to a testing device for relay protection for distribution networks.

Background technique

In order to improve the power supply reliability and intelligent operation level of the distribution network, a large number of distribution network automation equipment has been installed in recent years. The realization of the rapid fault isolation function of distribution network automation equipment depends on the reliable operation of automation devices. Therefore, field testing and fixed value verification before distribution network automation equipment is put into operation are very important, which is to ensure the effective realization of automation equipment functions. key step.

At present, although there are on-site fixed inspection and testing instruments, they are heavy in weight and need to be equipped with a generator to provide power for the fixed inspection and testing instruments. A lot of energy is spent on physical work such as instrument and equipment handling, especially for power distribution test equipment that needs to be transported for a long distance to reach the site. The ergonomics of the original test equipment is extremely unsatisfactory; Working on multiple acceptance and debugging sites, the work of moving instruments consumes more physical strength, which is not conducive to the effective allocation of energy to the most important equipment testing work, making it difficult to guarantee the quality of testing and calibration work; if different working groups Personnel working in different locations need to configure more testing instruments, and the cost of configuring testing instruments is relatively high.

At present, the distribution network relay protection automatic fixed detection test instrument directly uses the transmission network general protection automatic fixed detection test instrument, and the transmission network protection automatic fixed detection test instrument is fixed in the substation and has a fixed debugging power supply available; at the same time, the transmission network protection The function menu of the automatic fixed detection test instrument is very rich, and it is not only wasteful but also not targeted when used for the test of distribution network relay protection automation equipment.

In order to meet the compliance of the implementation of the regulations, after each trip of the distribution network equipment (especially the tripping event without faults), it is necessary to detect and protect the automation device according to the inspection regulations; if the test equipment is tested according to the existing equipment, the response speed will be slow. It is not conducive to the fault handling requirements of rapid detection, rapid judgment, and rapid power restoration. In short, the existing protection test instruments need to be equipped with external power sources such as generators or mobile power vehicles, which are not suitable for distribution network application scenarios, and cannot provide DC24V or DC48V working power for distribution network devices.

Contents of the invention

The purpose of the present invention is to propose a test device for distribution network relay protection, which solves the technical problem that existing instruments cannot meet the requirements of fast response speed, fast detection, fast judgment and fast power restoration.

On the one hand, a test device for relay protection of distribution network is provided, including:

Battery pack, main control board, display button board, power amplifier board, interface board and power adapter;

The interface board is connected to the main control board, and is used to connect with external devices through a plurality of external communication interfaces, and perform switching output or input, current output, voltage output and DC output through corresponding external communication interfaces; And check the externally introduced high voltage of the connected relay;

The power amplifier board is connected with the main control board, and is used to isolate the current or voltage of the connected relay, and to perform voltage power amplification and current power amplification;

The main control board is used to generate corresponding control signals according to the received signals, and respectively control the display button board, the power amplifier board and the interface board through the control signals; and, according to the interface board and The signal input by the power amplifier board checks the relay, and outputs the corresponding check result; wherein, the received signal at least includes the signal output or input signal for controlling the external communication interface, the interface board and the The signal input by the power amplifier board;

The display button board is connected with the main control board to input corresponding function commands and display the output inspection results;

The power adapter is used to connect an external power supply to supply power to the main control board, the display button board, the power amplifier board and the interface board;

The battery pack is respectively connected to the main control board, the display button board, the power amplifier board and the interface board to store power, and when the power adapter is not supplying power, The main control board, the display button board, the power amplifier board and the interface board are powered.

Preferably, the power amplifier board includes:

The voltage power amplifier control module is used to perform analog-to-digital conversion on the control signal output by the main control board to generate a voltage amplification signal;

The voltage power amplifier is used to amplify the voltage power according to the voltage amplification signal;

The voltage isolation power supply is used to isolate the power supply between the main control board and the voltage power amplifier control module, and output the amplified voltage according to the corresponding control signal;

The current power amplifier control module is used to perform analog-to-digital conversion on the control signal output by the main control board to generate a current amplification signal;

The current power amplifier is used to amplify the current power according to the current amplification signal;

A current isolation power supply, used to isolate the power supply between the main control board and the current power amplifier control module, and output the amplified current according to the corresponding control signal;

The auxiliary power supply is used for outputting a DC voltage according to a corresponding control signal.

Preferably, the interface board includes:

The switch output module is used as a relay output node to provide on-off control signals to the outside;

The digital input module is used for the on-off control signal of the external digital node and whether it is charged or not;

A voltage output module, configured to deliver the voltage signal output by the voltage isolation power supply to the equipment to be tested;

An auxiliary DC output module, configured to transmit the DC voltage signal output by the auxiliary power supply to the equipment to be tested;

The current output module is used to transmit the current signal output by the current isolation power supply to the equipment to be tested.

Preferably, the main control board includes:

The SOC processor unit is used to generate a corresponding control signal according to the signal output or input controlling the external communication interface, the signal input by the interface board and the power amplifier board;

The battery charge and discharge management unit is used to generate a corresponding control signal according to the working state of the power adapter, and switch between it and the charge and discharge state of the battery pack;

an external communication interface, connected to the interface board, for receiving signals input by the interface board and outputting control signals corresponding to the interface board;

A display keypad interface, connected to the display keypad, for receiving signals input by the display keypad and outputting control signals corresponding to the display keypad;

The interface of the power amplifier power board is connected with the power amplifier board, and is used for receiving the signal input by the power amplifier board and outputting the control signal corresponding to the power amplifier board.

Preferably, the battery charge and discharge management unit is specifically used for:

When it is detected that the power adapter is connected to an external power source, a direct power supply signal and a charging signal are generated;

When it is detected that the power adapter is not connected to an external power source, a discharge signal is generated.

Preferably, it also includes:

A charging and discharging management module, connected to the battery charging and discharging management unit, used to receive the control signal generated by the battery charging and discharging management unit, and control the charging and discharging management of the battery pack and the power adapter;

Wherein, when the charging and discharging management module receives a direct power supply signal, switch the power adapter to supply power to the main control board, the display button board, the power amplifier board and the interface board;

When the charging and discharging management module receives a charging signal, switch the power adapter to charge the battery pack;

When the charge and discharge management module receives the discharge signal, it switches the battery pack to supply power to the main control board, the display button board, the power amplifier board and the interface board.

Preferably, the display keypad includes:

The input module is used to receive control instructions and corresponding parameters input by the user;

The display module is used for displaying the received inspection result.

Preferably, it also includes:

The communication module is used for wirelessly connecting the main control board with other routing devices.

Preferably, it also includes:

The positioning module is used to obtain the position information of the test device for the relay protection of the distribution network in real time, and perform satellite time synchronization.

In summary, implementing the embodiments of the present invention has the following beneficial effects:

The test device for relay protection of distribution network provided by the present invention solves the problem of untargeted relay protection test equipment for distribution network for a long time, and provides a self-contained lithium battery, hand-held, strong pertinence, and easy operation relay protection tester. Through the basic training of the present invention, basic level relay protection workers of the distribution network can master and use it proficiently, and the training period is shortened. It can effectively avoid many inconveniences such as self-provided generators or mobile power vehicles, and the need for multiple people to carry the traditional relay protection tester. In view of the problem of no test power supply during the power outage maintenance of outdoor switch cabinets, the device itself provides 5-48V continuously adjustable programmable power output, which can conveniently supply power for equipment with different power supply requirements such as 12V, 24V or 48V in the switch cabinet.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.

FIG. 1 is a schematic diagram of a test device for relay protection of a distribution network in an embodiment of the present invention.

Fig. 2 is a schematic diagram of a test device for relay protection of a distribution network in an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 and Fig. 2, it is a schematic diagram of an embodiment of a test device for distribution network relay protection provided by the present invention. In this embodiment, the device includes:

Battery pack 101, main control board 102, display button board 103, power amplifier board 104, interface board 105 and power adapter; , an interface board 105 and an external power adapter (when the battery power is sufficient, the power adapter may not be connected). Wherein, the battery pack 101 in this embodiment adopts a lithium battery.

In a specific embodiment, the interface board 105 is connected to the main control board 102, and is used to connect with external devices through a plurality of external communication interfaces, and perform switching output or input and current output through the corresponding external communication interfaces. , voltage output and DC output; and check the high voltage introduced from the outside of the connected relay; that is, the interface board 105 is connected with the settings that need to be detected externally, and the interface board 105 can output control signals and on-off signals to supply power for external devices Wait.

Specifically, the interface board 105 includes: a switch output module, which is used as a relay output node to provide an on-off control signal to the outside; a switch input module, which is used to detect the on-off control signal of an external switch node and whether it is charged; The voltage output module is used to transmit the voltage signal output by the voltage isolation power supply to the equipment to be tested; the auxiliary DC output module is used to transmit the DC voltage signal output by the auxiliary power supply to the equipment to be tested; the current output module is used to The current signal output by the galvanic isolation power supply is sent to the equipment to be tested. Understandably, there are at least 2 switch output circuits and terminal interfaces, 2 switch input circuits and terminal interfaces; 1 voltage output terminal interface and related output relays and external high voltage introduction alarm circuits; 1 auxiliary DC output terminal Interface and output relay and external high voltage lead-in alarm circuit; 1 current output terminal. Among them, the digital input is used for the on-off of the external digital node or whether it is electrified or not. The switch value output is a standard power relay node output, which is used to provide on and off control to the outside. It should be noted that the IO peripherals of this device include 2-way USB host interfaces, which can be used to connect standard USB peripherals such as U disks, keyboards, and mice; RJ45 Ethernet interfaces are used for communication with the host computer; debugging serial ports are used for device functions Debugging; the indicator light is used to display the power supply and system status. The RS485 time synchronization interface is aimed at the power industry, mainly IRIG-B time synchronization (a coding format for industry time synchronization signals).

In this embodiment, the power amplifier board 104 is connected to the main control board 102 to isolate the current or voltage of the connected relay, and to perform voltage power amplification and current power amplification; that is, voltage isolation Power supply (+-400V output), voltage power amplifier control circuit (analog-to-digital conversion circuit) and voltage power amplifier circuit; current isolated power supply (+-6V output), current power amplifier control circuit (analog-to-digital conversion circuit) and current power amplification Circuit; auxiliary power supply (DC 5-48V output).

Specifically, the power amplifier board 104 includes: a voltage power amplifier control module, which is used to perform analog-to-digital conversion on the control signal output by the main control board 102 to generate a voltage amplification signal; a voltage power amplifier, which is used to amplify the signal according to the voltage Amplify the voltage power; the voltage isolation power supply is used to isolate the power supply between the main control board 102 and the voltage power amplifier control module, and output the amplified voltage according to the corresponding control signal; the current power amplifier control module uses To perform analog-to-digital conversion on the control signal output by the main control board 102 to generate a current amplified signal; a current power amplifier is used to amplify the current power according to the current amplified signal; a current isolation power supply is used to amplify the current power of the main control board The power supply between 102 and the current power amplifier control module is isolated, and the amplified current is output according to the corresponding control signal; the auxiliary power supply is used to output the DC voltage according to the corresponding control signal. That is, the power amplifier power supply is a DC/DC isolated power supply, including two parts: a voltage power supply and a current power supply. The main power supply circuit of the voltage power supply is a flyback isolated switching power supply, which provides +-400V isolated voltage output. In addition, there is a low voltage +-15V output for the digital-to-analog converter and the operational amplifier of the power amplifier. The main power supply circuit of the current power supply is also a flyback isolated switching power supply, which provides +-6V isolated voltage output. In addition, there is a +-12V output for the digital-to-analog converter and some operational amplifiers of the power amplifier. The output control of each power supply of the system power supply is controlled by the SOC control unit.

As mentioned above, the galvanic isolated power supply and the voltage isolated power supply are controlled by CPLD. The main reason is that FPGA power-on configuration is slow (the FPGA configuration of SOC often requires the bootloader to start to load the configuration file), while CPLD completes the configuration loading at the moment of power-on. The signal that needs real-time control is controlled by CPLD, which can avoid unexpected signal output when the device is powered on or power-on of the wrong power supply inside the device (such as power amplifier power supply, when other control signals are not confirmed, power-on of the power amplifier power supply is easy to damage the power amplifier power device). The CPLD outputs the control voltage and the digital-analog converter control signal of the current power amplifier, after signal isolation, the digital-analog converter is driven to output the corresponding analog waveform signal, and the waveform signal is sent to the subsequent power amplifier circuit to output the corresponding power signal (voltage The power amplifier outputs a high voltage signal, and the circuit power amplifier outputs a current signal).

Among them, the auxiliary power output uses a PWM-controlled buck-boost DC/DC control circuit to output a 5-48V DC voltage signal to provide power for the device under test.

In this embodiment, the main control board 102 is used to generate corresponding control signals according to the received signals, and respectively control the display button board 103, the power amplifier board 104 and the interface board 105 through the control signals and, check the relay according to the signals input by the interface board 105 and the power amplifier board 104, and output the corresponding check result; wherein, the received signal includes at least a signal for controlling the external communication interface Output or input signal, the signal input by the interface board 105 and the power amplifier board 104; that is, the main control board 102 is one of the core components of the system, and is the integration of all digital circuit parts, including the SOC processor unit , the battery charge and discharge management unit, the power supply part of the digital system, the external communication interface, the interface with the display key board 103, and the interface with the power amplifier power board.

Specifically, the main control board 102 includes:

SOC processor unit, in order to generate corresponding control signal according to the signal output or input of control described external communication interface, the signal input of described interface board 105 and described power amplifier board 104; That is, SOC processor refers to The form of FPGA+MPU combination can be a SOC processor packaged into a single chip, such as Xilinx's ZYNQ series, or it can be in the form of a separate ARM processor+FPGA chip. Of course, in addition to the core ARM, FPGA or SOC chip, it also includes memory (DDR3/DDR4 memory) that supports the operation of the SOC system, QSPI-FLASH storage (mainly storing the lowest-level system program files such as boot programs and kernel mapping files), Electronic disk EMMC interface (it can be considered as a TF card directly welded to the motherboard, but its reliability is much better than TF card) or SATA interface (that is, solid-state hard disk, which can be M.2 interface, standard SATA interface or mSATA interface ), and the necessary reset circuit. The IO peripherals of this device include 2-way USB host interface, which can be used to connect standard USB peripherals such as U disk, keyboard, mouse, etc.; RJ45 Ethernet interface, used for communication with the host computer; debugging serial port for device function debugging; indicator light Used to display power and system status. The RS485 time synchronization interface is aimed at the power industry, mainly IRIG-B time synchronization (a coding format for industry time synchronization signals).

The battery charge and discharge management unit is used to generate a corresponding control signal according to the working state of the power adapter, and to switch and manage the charge and discharge state of the battery pack 101; that is, the charge and discharge management unit mainly implements 1, the adapter Automatic switching control of power supply and battery power supply; 2, battery charging control; 3, adapter input voltage, current, power monitoring. It also includes the power conversion of the main system power supply, such as the system main 5V, 3.3V power supply, and the 1.0V power supply required by the SOC, the 1.8V, 2.5V power supply required by other IO ports, and the 1.5V power supply required by the memory, etc. . All main power supplies use low-voltage DC/DC step-down circuits to improve the overall efficiency of the power supply system. In addition, it is also necessary to reasonably arrange the power-on sequence of each power supply output according to the power-on sequence of the processor.

Specifically, the battery charge and discharge management unit is specifically configured to: generate a direct power supply signal and a charging signal when it is detected that the power adapter is connected to an external power source; when it is detected that the power adapter is not connected to an external power source, Generate a discharge signal.

Cooperating with the battery charge and discharge management unit, it also includes: a charge and discharge management module, connected to the battery charge and discharge management unit, to receive the control signal generated by the battery charge and discharge management unit, and control the battery pack 101 and the power supply Adapter charge and discharge management; Wherein, when the charge and discharge management module receives the direct power supply signal, switch the power adapter to the main control board 102, the display button board 103, the power amplifier board 104 and the The interface board 105 provides power; when the charging and discharging management module receives the charging signal, switch the power adapter to charge the battery pack 101; when the charging and discharging management module receives the discharging signal, switch the battery The group 101 supplies power for the main control board 102 , the display button board 103 , the power amplifier board 104 and the interface board 105 . That is to say, the charging and discharging management module is arranged outside the main control board 102, and is arranged together with the power adapter and the battery pack 101, and is mainly used for automatic switching between the adapter power supply and the battery power supply, and is controlled by the corresponding described in the main control board 102. The control of the battery charge and discharge management unit performs the switching operation according to the control signal output by the battery charge and discharge management unit.

The external communication interface is connected with the interface board 105 for receiving the signal input by the interface board 105 and outputting the corresponding control signal of the interface board 105; the display key board 103 interface is connected with the display key board 103, In order to receive the signal input by the display key board 103 and output the control signal corresponding to the display key board 103; the power amplifier power board interface is connected with the power amplifier board 104 for receiving the input signal from the power amplifier board 104 signal and output the control signal corresponding to the power amplifier board 104.

In this embodiment, the display keypad 103 is connected to the main control board 102 to input corresponding functional instructions and display the output inspection results; specifically, the display keypad 103 includes: an input module , used to receive control instructions and corresponding parameters input by the user; and a display module, used to display the received inspection results. That is, the display, touch screen and keys belong to a functional area, which provides the man-machine operation interface and interface. Due to the size and thickness of the LCD display screen of 8 inches and below, several power supplies necessary for the LCD screen work are not integrated on the LCD screen module, and the user needs to design a dedicated power supply circuit, which is generally called a TCON circuit in the industry. . In addition to the backlight control circuit, the corresponding dimming circuit is not integrated into the LCD module, so a PWM dimming circuit needs to be specially designed. The touch screen is a capacitive touch screen, supports multi-touch, and communicates with the SOC processor unit through the USB or I2C interface, so as to realize the touch operation function of the touch screen. The key adopts the computer standard key controller to drive the keyboard matrix, which simplifies the program of the SOC processor and improves the replaceability of the functional modules.

In this embodiment, the power adapter is used to connect an external power supply to supply power to the main control board 102, the display button board 103, the power amplifier board 104 and the interface board 105; The electricity is converted into low-voltage direct current available inside the device and input to the power supply part of the device.

In this embodiment, the battery pack 101 is respectively connected to the main control board 102, the display button board 103, the power amplifier board 104 and the interface board 105 to store power, and when the When the power adapter is not supplying power, it supplies power to the main control board 102 , the display button board 103 , the power amplifier board 104 and the interface board 105 respectively. In addition to the lithium battery pack 101, the lithium battery pack also includes a complete charging and discharging control circuit, a battery equalization circuit, overcurrent, overheating protection, and a battery fuel gauge. The technical idea is derived from the notebook battery management technology, and is now also widely used in drones, smart locks and other fields.

In this embodiment, it further includes: a communication module, configured to communicate and connect the main control board 102 with other routing devices in a wireless manner. The positioning module is used to obtain the position information of the test device for the relay protection of the distribution network in real time, and perform satellite time synchronization. That is, the WIFI module provides the wireless connection function for the system. As a tester, WIFI works in AP mode, so that the host computer can directly connect to the tester without additional wireless routing equipment. BD/GPS provides precise satellite timing function.

In summary, implementing the embodiments of the present invention has the following beneficial effects:

The test device for relay protection of distribution network provided by the present invention solves the problem of untargeted relay protection test equipment for distribution network for a long time, and provides a self-contained lithium battery, hand-held, strong pertinence, and easy operation relay protection tester. Compared with the complicated main network relay protection testing equipment, the present invention can be mastered and used by the distribution network grassroots relay protection workers through basic training, reducing the training period. It can effectively avoid many inconveniences such as self-provided generators or mobile power vehicles, and the need for multiple people to carry the traditional relay protection tester. In view of the problem of no power supply during the acceptance of outdoor switchgear or power failure maintenance, the device itself provides 5-48V continuously adjustable programmable power output, which can easily supply power to equipment with different power supply requirements such as 12V, 24V or 48V in the switchgear.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (9)

1. The utility model provides a testing arrangement of distribution network relay protection which characterized in that includes:

the device comprises a battery pack, a main control board, a display key board, a power supply power amplification board, an interface board and a power adapter;

the interface board is connected with the main control board, is used for being connected with an external device through a plurality of external communication interfaces, and carries out switching value output or input, current output, voltage output and direct current output through the corresponding external communication interfaces; and checking externally introduced high voltage of the connected relay;

the power supply power amplification board is connected with the main control board and used for isolating the current or voltage of the connected relay and performing voltage power amplification and current power amplification;

the main control board is used for generating corresponding control signals according to the received signals, and respectively controlling the display key board, the power supply power amplification board and the interface board through the control signals; the relay is checked according to signals input by the interface board and the power supply power amplification board, and a corresponding check result is output; the received signals at least comprise signals for controlling the output or input of the external communication interface and signals input by the interface board and the power amplifier board;

the display key board is connected with the main control board and used for inputting corresponding functional instructions and displaying output inspection results;

the power adapter is used for connecting an external power supply and supplying power to the main control board, the display key board, the power supply power amplification board and the interface board;

the battery pack is respectively connected with the main control board, the display key board, the power supply power amplification board and the interface board and used for storing electric quantity, and when the power adapter does not supply power, the battery pack respectively supplies power to the main control board, the display key board, the power supply power amplification board and the interface board.

2. The testing device for relay protection of the power distribution network of claim 1, wherein the power amplifier board comprises:

the voltage power amplifier control module is used for carrying out analog-to-digital conversion on the control signal output by the main control board to generate a voltage amplification signal;

the voltage power amplifier is used for amplifying voltage power according to the voltage amplification signal;

the voltage isolation power supply is used for isolating the power supply between the main control board and the voltage power amplifier control module and outputting amplified voltage according to a corresponding control signal;

the current power amplifier control module is used for carrying out analog-to-digital conversion on the control signal output by the main control board to generate a current amplification signal;

the current power amplifier is used for amplifying the current power according to the current amplification signal;

the current isolation power supply is used for isolating the power supply between the main control board and the current power amplifier control module and outputting amplified current according to a corresponding control signal;

the auxiliary power supply is used for outputting direct current voltage according to the corresponding control signal.

3. The testing device for relay protection of the power distribution network according to claim 2, wherein the interface board comprises:

the switching value output module is used as a relay output node and provides an on-off control signal to the outside;

the switching value input module is used for on-off control signals of external switching value nodes and detecting whether the external switching value nodes are electrified or not;

the voltage output module is used for transmitting the voltage signal output by the voltage isolation power supply to equipment to be tested;

the auxiliary direct current output module is used for transmitting the direct current voltage signal output by the auxiliary power supply to equipment to be tested;

and the current output module is used for transmitting the current signal output by the current isolation power supply to the equipment to be tested.

4. The testing device for relay protection of the power distribution network according to claim 3, wherein the main control board comprises:

the SOC processor unit is used for generating corresponding control signals according to signals input or output by controlling the external communication interface and signals input by the interface board and the power supply power amplification board;

the battery charging and discharging management unit is used for generating a corresponding control signal according to the working state of the power adapter and switching and managing the control signal and the charging and discharging state of the battery pack;

the external communication interface is connected with the interface board and used for receiving the signals input by the interface board and outputting control signals corresponding to the interface board;

the display key board interface is connected with the display key board and used for receiving the signal input by the display key board and outputting a control signal corresponding to the display key board;

and the power amplification power panel interface is connected with the power amplification panel and used for receiving the signal input by the power amplification panel and outputting a control signal corresponding to the power amplification panel.

5. The testing apparatus for power distribution network relay protection according to claim 4, wherein the battery charging and discharging management unit is specifically configured to:

when the power adapter is detected to be connected with an external power supply, generating a direct power supply signal and a charging signal;

and generating a discharging signal when detecting that the power adapter does not switch on the external power supply.

6. The testing device for relay protection of the power distribution network according to claim 5, further comprising:

the charging and discharging management module is connected with the battery charging and discharging management unit and used for receiving the control signal generated by the battery charging and discharging management unit and controlling the charging and discharging management of the battery pack and the power adapter;

when the charge and discharge management module receives a direct power supply signal, the power adapter is switched to supply power to the main control board, the display key board, the power amplification board and the interface board;

when the charging and discharging management module receives a charging signal, the power adapter is switched to charge the battery pack;

and when the charging and discharging management module receives a discharging signal, the battery pack is switched to supply power to the main control board, the display key board, the power supply power amplification board and the interface board.

7. The testing device for relay protection of the power distribution network according to claim 6, wherein the display key board comprises:

the input module is used for receiving a control instruction and corresponding parameters input by a user;

and the display module is used for displaying the received inspection result.

8. The testing apparatus for relay protection of power distribution network according to claim 1, further comprising:

and the communication module is used for carrying out communication connection on the main control board and other routing equipment in a wireless mode.

9. The testing device for relay protection of the power distribution network according to claim 1, further comprising:

and the positioning module is used for acquiring the position information of the testing device for the relay protection of the power distribution network in real time and carrying out satellite time synchronization.

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