Distribution network test circuit and portable distribution network test device

Abstract

The utility model discloses a distribution network test circuit and a portable distribution network test device. The circuit comprises a control system, an analog quantity module, a switching value module, an optical digital module, a time synchronization module, a man-machine interaction module, an interface module and a power supply module. The analog quantity module, the switching value module, the optical digital module, the time synchronization module, the man-machine interaction module and the interface module are all connected with the control system. The portable distribution network testing device comprises a shell and the distribution network testing circuit. The system is suitable for various test scenes in a distribution network test, can satisfy the functions of a distribution terminal full-automatic test, a protection function test, a feeder automation FA test and the like, and reduces the workload of a manual operation test.

Description

Technical Field

[0001] The utility model belongs to the technical field of distribution network testing, and in particular relates to a distribution network testing circuit and a portable distribution network testing device. Background Art

[0002] In recent years, distribution network automation has developed rapidly, and the testing and operation of various functional equipment in the distribution network automation system has become an important link. Among them, the distribution terminal has a remote communication terminal with SCADA function, which is installed next to various primary equipment such as feeder switches, ring network cabinets, and distribution transformers in the distribution network to monitor the operating status of the primary equipment; there are many types of distribution terminals, wide distribution, and large numbers, which require a lot of on-site testing. Feeder automation FA uses certain technical means to achieve rapid positioning and isolation of fault points in various sections of the feeder, as well as power supply restoration in non-fault sections; its testing has high requirements on the reliability of the communication system, complex fault detection logic, and many types of test items, and needs to be equipped with corresponding analysis software. At present, the digital-analog integrated relay protection tester with more functions is large in size and weight, and lacks a special test interface for distribution networks. In addition, there is no power supply on site, and a large mobile power supply needs to be additionally equipped, which brings a lot of inconvenience to the test; most portable relay protection testers only support digital output, and the use scenarios are limited. Utility Model Content

[0003] The main purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a distribution network test circuit and a portable distribution network test device, which can be applied to various test scenarios in distribution network testing and meet the requirements of fully automatic testing of distribution terminals and protection function testing.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] In a first aspect, the utility model provides a distribution network test circuit, including a control system, an analog quantity module, a switch quantity module, an optical digital module, a timing module, a human-computer interaction module, an interface module and a power supply module;

[0006] The control system includes a heterogeneous multi-core CPU and an FPGA mounted on the heterogeneous multi-core CPU, wherein the heterogeneous multi-core CPU is used for a graphical interface and data calculation and processing; the FPGA is used for digital signal control of an analog quantity module, a switch quantity module, and an optical digital module; the human-computer interaction module, the interface module, and the timing module are connected to the heterogeneous multi-core CPU of the control system, and the analog quantity module, the switch quantity module, and the optical digital module are connected to the control system FPGA;

[0007] The analog quantity module is used to output voltage and current analog quantities to the device under test;

[0008] The switch quantity module is used to receive and control the switch quantity of the device under test;

[0009] The optical digital module is used to receive and send messages;

[0010] The timing module is used for Beidou, GPS, IRIG-B code or IEEE-1588 synchronization;

[0011] The human-computer interaction module is used to realize human-computer interaction;

[0012] The interface module is used to communicate and exchange data with the device under test;

[0013] The power supply module is used to provide power for the control system, analog quantity module, switch quantity module, optical digital module, time synchronization module, human-computer interaction module and interface module.

[0014] As a preferred technical solution, the control system is a heterogeneous multi-core CPU AM5708 equipped with FPGA XC7A200T.

[0015] As a preferred technical solution, the analog module includes an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, a filtering circuit, an operational amplifier circuit, a voltage source and a current source. The digital signal is converted into an analog signal through the digital-to-analog conversion circuit, filtered through the filtering circuit, and then amplified through the operational amplifier circuit to output analog voltage and analog current. The voltage source and current source provide power for the operational amplifier circuit. In addition, the output analog voltage and current will be converted into digital signals through the analog-to-digital conversion circuit internally for sampling and comparison to ensure the accuracy of the final analog output.

[0016] As a preferred technical solution, the switch quantity module includes 4-way binary input quantity control circuit and 4-way binary output quantity control circuit.

[0017] As a preferred technical solution, the optical digital module includes 4 optical network port transceiver circuits that can switch between 100M or 1000M optical network ports, 2 optical serial port receiving circuits and 2 optical serial port sending circuits. The optical network port transceiver circuit sends and receives messages through an Ethernet transceiver chip and an optical module, and the optical serial port transceiver circuit receives and sends messages through a photoelectric conversion transceiver module.

[0018] As a preferred technical solution, the interface module includes a power grid port, a USB port, an RS232 multiplexing interface, an RS485 multiplexing interface, an SD card port and a wireless communication interface.

[0019] As an optimal technical solution, the timing module receives Beidou or GPS signals through an antenna and obtains a time signal through processing by a timing chip, realizes optical IRIG-B code timing by multiplexing an optical serial port transceiver circuit, realizes electrical IRIG-B code timing by multiplexing an RS485 interface, and realizes IEEE-1588 timing by multiplexing an optical network port transceiver circuit.

[0020] As a preferred technical solution, the human-computer interaction module adopts a full touch control screen.

[0021] In a second aspect, the utility model provides a portable distribution network test device, including a housing and a distribution network test circuit arranged in the housing.

[0022] As a preferred technical solution, the portable network distribution test device is connected to the terminal under test through an analog quantity module, a switch quantity module and an optical digital module to complete the network distribution test of the terminal under test.

[0023] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0024] The distribution network test circuit of the utility model is suitable for various test scenarios in distribution network test, and can meet the functions of full-automatic test of distribution terminal, protection function test, feeder automation FA test, etc., reducing the workload of manual operation test. In addition, it can also be used for digital and analog relay protection test, combined unit test, etc.

[0025] The distribution network test device of the utility model is equipped with multiple analog and digital quantities, a full touch screen, and a built-in lithium battery, while still maintaining a light and thin small volume only the size of an A4 paper, and can be easily carried. No external power supply is required, and one person can easily perform operation and testing by holding it. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments 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 creative work.

[0027] Figure 1 This is a structural diagram of a distribution network test circuit of the utility model;

[0028] Figure 2 It is a schematic diagram of the distribution network testing device of the utility model;

[0029] Figure 3 It is a connection diagram of the distribution network test device of the utility model and the terminal under test.

[0030] Description of the accompanying figures: 1-housing; 2-human-computer interaction module; 3-input control circuit interface; 4-output control circuit interface; 5-optical serial port sending circuit interface; 6-optical serial port receiving circuit interface; 7-optical network port; 8-voltage output port; 9-current output port; 10-RS232 / RS485 interface; 11-USB interface; 12-power grid port; 13-SD card interface. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] PCIE: High-speed serial computer expansion bus standard;

[0033] IRIG-B: A standard time code encoding format;

[0034] IEEE-1588: A synchronization protocol standard;

[0035] RS232 / RS485: Two serial communication standards.

[0036] See also Figure 1 This embodiment provides a distribution network test circuit, including a control system, an analog quantity module, a switch quantity module, an optical digital module, a timing module, a human-computer interaction module, an interface module and a power supply module; the power supply module provides power for the control system, the analog quantity module, the switch quantity module, the optical digital module, the timing module, the human-computer interaction module and the interface module.

[0037] Furthermore, the control system includes a heterogeneous multi-core CPU and an FPGA mounted on the heterogeneous multi-core CPU, the heterogeneous multi-core CPU is used for graphical interface and data calculation processing; the FPGA is used for digital signal control of analog modules, switch modules, and optical digital modules; the heterogeneous multi-core CPU and FPGA communicate via protocols such as PCIE. The human-computer interaction module, interface module, and timing module are connected to the heterogeneous multi-core CPU of the control system, and the analog modules, switch modules, and optical digital modules are connected to the control system FPGA;

[0038] Furthermore, the control system is a heterogeneous multi-core CPU AM5708 equipped with FPGA XC7A200T; AM5708 is a heterogeneous multi-core SoC core board, which has been professionally verified by PCB Layout and high and low temperature tests, is stable and reliable, and can meet various industrial application environments. XC7A200T is a high-performance field programmable gate array (FPGA) chip, which integrates a large number of logic resources, efficient DSP processing capabilities and high-bandwidth I / O interface advanced FPGA, which can meet high-demand computing and data processing applications.

[0039] Furthermore, the analog module is composed of an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, a filtering circuit, an operational amplifier circuit, a voltage source, a current source, etc. The digital signal is converted into an analog signal through the digital-to-analog conversion circuit, filtered through the filtering circuit, and then amplified through the operational amplifier circuit to output analog voltage and analog current. The voltage source and the current source provide power for the operational amplifier circuit. In addition, the output analog voltage and current will be converted into digital signals through the analog-to-digital conversion circuit internally for sampling and comparison to ensure the accuracy of the final analog output.

[0040] Furthermore, the switch quantity module includes 4 pairs of binary input control circuits and 4 pairs of fast binary output control circuits, and receives and controls the switch quantity of the device under test through the cooperation of optical couplers and power tubes.

[0041] Furthermore, the optical digital module includes 4 pairs of optical network port transceiver circuits that can switch between 100M or 1000M optical network ports and 2 pairs of optical serial port transceiver circuits. The optical network port transceiver circuits send and receive messages through Ethernet transceiver chips and optical modules, and the optical serial port transceiver circuits receive and send messages through optoelectronic conversion transceiver modules.

[0042] Furthermore, the timing module includes Beidou, GPS, IRIG-B code, and IEEE-1588 synchronous timing functions. The Beidou or GPS signal is received through the antenna and processed by the timing chip to obtain the time signal. The optical IRIG-B code timing is realized by multiplexing the optical serial port transceiver circuit, the electrical IRIG-B code timing is realized by multiplexing the RS485 interface, and the IEEE-1588 timing is realized by multiplexing the optical network port transceiver circuit.

[0043] Furthermore, the human-computer interaction module adopts a 10.1-inch full-touch control screen and friendly and convenient operating software.

[0044] Furthermore, the interface module includes a power grid port, a USB port, an RS232 multiplexing interface, an RS485 multiplexing interface, an SD card port and a wireless communication interface.

[0045] Furthermore, in a specific embodiment, the interface module is configured as a Gigabit network port, two USB ports, two RS232 / RS485 multiplexing interfaces, an SD card, a built-in WIFI+Bluetooth module, etc.

[0046] Furthermore, the power module includes a lithium battery and power management. The lithium battery can be charged with an AC power adapter and supports fast charging. It has short circuit protection and anti-overcharging function. In addition, the lithium battery can be removed and replaced to ensure the endurance in an environment where charging is not possible for a long time. The lithium battery power is converted into different voltages suitable for other modules through a voltage conversion circuit, and all circuits of the device are powered by energy-saving management.

[0047] See also Figure 2 In another embodiment, a portable distribution network test device is provided, including a shell 1 and the above-mentioned distribution network test circuit; wherein the control system is arranged inside the shell, and the human-computer interaction module 2 is arranged on one side of the shell to realize the human-computer interaction of the operator.

[0048] Furthermore, one side of the housing 1 is provided with 4-way input quantity control circuit interface 3, 4-way output quantity control circuit interface 4, 2-way optical serial port transmitting circuit interface 5, 2-way optical serial port receiving circuit interface 6, and 4-way optical network port 7. One side of the housing 1 is also provided with 4-way voltage output port 8 and 4-way current output port 9.

[0049] Furthermore, an RS232 / RS485 interface 10 , two USB interfaces 11 , a power network interface 12 and an SD card interface 13 are provided on the other side of the housing 1 .

[0050] It is understandable that the portable distribution network test device interacts with the user through the human-computer interaction module (touch screen), and sets different test parameters and items according to the user's test requirements. The user connects the test device to the device under test and can start the test with one click. After being processed by the control system, various tests are automatically performed, and finally the test results and reports are fed back. Please refer to Figure 3 The analog output module of the portable distribution network test device can apply voltage and current to the analog input terminals of the terminal under test; the optical digital module of the portable distribution network test device uses the IEC60870-5-101 / 104 communication protocol to communicate with the distribution network automation terminal through optical fiber to send and receive messages, extract data and analyze and compare; the switch quantity module of the portable distribution network test device can simulate the switch state and apply the output to the state quantity terminal of the distribution network automation terminal, and monitor the switch position information, changes and other information of the state quantity output terminal of the distribution network automation terminal through the input quantity.

[0051] It should be noted that, in this specification, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0052] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Distribution network test circuit, characterized in that: It includes control system, analog quantity module, switch quantity module, optical digital module, timing module, human-computer interaction module, interface module and power supply module; The control system includes a heterogeneous multi-core CPU and an FPGA mounted on the heterogeneous multi-core CPU, wherein the heterogeneous multi-core CPU is used for a graphical interface and data calculation and processing; the FPGA is used for digital signal control of an analog quantity module, a switch quantity module, and an optical digital module; the human-computer interaction module, the interface module, and the timing module are connected to the heterogeneous multi-core CPU of the control system, and the analog quantity module, the switch quantity module, and the optical digital module are connected to the control system FPGA; The analog quantity module is used to output voltage and current analog quantities to the device under test; The switch quantity module is used to receive and control the switch quantity of the device under test; The optical digital module is used to receive and send messages; The timing module is used for Beidou, GPS, IRIG-B code or IEEE-1588 synchronization; The human-computer interaction module is used to realize human-computer interaction; The interface module is used to communicate and exchange data with the device under test; The power supply module is used to provide power for the control system, analog quantity module, switch quantity module, optical digital module, time synchronization module, human-computer interaction module and interface module.

2. The distribution network test circuit according to claim 1, characterized in that: The control system is a heterogeneous multi-core CPUAM5708 equipped with FPGA XC7A200T.

3. The distribution network test circuit according to claim 1, characterized in that: The analog module includes an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, a filtering circuit, an operational amplifier circuit, a voltage source and a current source. The digital signal is converted into an analog signal by the digital-to-analog conversion circuit, filtered by the filtering circuit, and then amplified by the operational amplifier circuit to output analog voltage and analog current. The voltage source and the current source provide power for the operational amplifier circuit. In addition, the output analog voltage and current will be converted into digital signals by the analog-to-digital conversion circuit internally for sampling comparison to ensure the accuracy of the final analog output.

4. The distribution network test circuit according to claim 1, characterized in that: The switch quantity module comprises a 4-way switch input quantity control circuit and a 4-way switch output quantity control circuit.

5. The distribution network test circuit according to claim 1, characterized in that: The optical digital module includes 4 optical network port transceiver circuits that can switch between 100M or 1000M optical network ports, 2 optical serial port receiving circuits and 2 optical serial port sending circuits. The optical network port transceiver circuit sends and receives messages through an Ethernet transceiver chip and an optical module, and the optical serial port transceiver circuit receives and sends messages through a photoelectric conversion transceiver module.

6. The distribution network test circuit according to claim 5, characterized in that: The interface module includes a power grid port, a USB port, an RS232 multiplexing interface, an RS485 multiplexing interface, an SD card port and a wireless communication interface.

7. The distribution network test circuit according to claim 6, characterized in that: The timing module receives Beidou or GPS signals through an antenna and obtains a time signal after processing by a timing chip, realizes optical IRIG-B code timing by multiplexing an optical serial port transceiver circuit, realizes electrical IRIG-B code timing by multiplexing an RS485 interface, and realizes IEEE-1588 timing by multiplexing an optical network port transceiver circuit.

8. The distribution network test circuit according to claim 1, characterized in that: The human-computer interaction module adopts a full touch control screen.

9. A portable distribution network testing device, characterized in that: The invention comprises a housing and a distribution network test circuit as claimed in any one of claims 1 to 7 arranged in the housing.

10. The portable network distribution test device according to claim 9, characterized in that: The portable network distribution test device is connected to the terminal under test through an analog quantity module, a switch quantity module and an optical digital module to complete the network distribution test of the terminal under test.

Images