Automatic test system and method for relay protection device

Abstract

The invention provides an automatic test system and method for a relay protection device, and the hardware architecture of the automatic test system comprises an upper computer which is in communication connection with a test device and a to-be-tested relay protection device. The upper computer sends an electric quantity control command to the testing device, sends a control command for switching on and off a protection pressing plate and modifying a protection fixed value to the relay protection device, and receives testing data generated by the testing device and action information uploaded by the relay protection device. The testing device sends the collected electric quantity analog quantity and the switching value to the relay protection device and receives switching value data fed back by the relay protection device. According to the embodiment of the invention, the automation degree of the relay protection device test can be improved, the workload of system development and maintenance is reduced, and the diversity requirements of different protection function tests are met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of relay protection device testing, and in particular, to an automatic testing system and method for relay protection devices. Background Art

[0002] Relay protection technology is developing rapidly. At present, the relay protection device of the intelligent substation has integrated protection, measurement, control and communication into an organic whole. The relay protection system has very high requirements for reliability, which requires a lot of tests to ensure its reliability. For a long time, the test of relay protection devices has mainly relied on testers to manually complete it using relay protection test devices. Although microcomputer-based relay protection test devices have been widely used in the test process of relay protection devices, and the test level has been improved to a certain extent, in actual manual testing, testers are required to have high professional qualities, have a deep understanding of the protection principle of the protection device, and be proficient in using relay protection test devices and their test software. During the test process, it is necessary to continuously operate the protection device and adjust the test parameters according to the different protection test functions to realize the functions of protection pressure plate input and output, setting value modification, analog output, etc., and the tester needs to manually record the test data. After the test is completed, the test data needs to be analyzed and compiled into a test report. This manual testing method has many shortcomings, such as a lot of repetitive work, low automation, difficulty in ensuring test consistency, limited test coverage, and low test efficiency, which brings hidden dangers to the quality control of relay protection device products and the safe operation of power systems. Therefore, it is necessary to develop an automated modular relay protection device test system to improve test efficiency and accuracy.

[0003] In summary, the current relay protection testing method often requires too much manual participation, and this testing method has many disadvantages such as heavy workload, low testing efficiency, and difficulty in ensuring test consistency. Summary of the invention

[0004] In view of this, the present disclosure aims to provide an automatic testing system and method for relay protection devices to solve technical problems in the prior art such as requiring too many manual links to participate, heavy workload, low testing efficiency, and difficulty in ensuring test consistency.

[0005] One aspect of the present disclosure provides an automatic testing system for a relay protection device, the hardware architecture of the automatic testing system includes a host computer, the host computer is communicatively connected with a test device and a relay protection device to be tested, the host computer sends a power control command to the test device and sends a control command to the relay protection device to activate and deactivate a protection pressure plate and to modify a protection setting, and receives test data generated by the test device and action information uploaded by the relay protection device, the test device sends collected power analog quantities and switch quantities to the relay protection device and receives switch quantity data fed back by the relay protection device.

[0006] In some embodiments, the test device includes at least a communication test module and a test device test module. The communication test module is used to realize the activation and deactivation of the protection pressure plate in the relay protection device and the modification of the protection setting value; the test device test module is used to output the corresponding test power to be applied to the relay protection device and to receive the tripping signal and record the action parameters after the protection is activated.

[0007] In some embodiments, the communication connection between the host computer and the test device is used to at least meet the following functions: control the test device to output an analog quantity of electrical quantity, control the DC output and the switch output of the test device; read the switch input status of the test device in real time and obtain the accurate action time; the communication connection between the host computer and the relay protection device is used to at least meet the following functions: automatic activation and deactivation of the protection pressure plate, automatic reading and writing of protection constants, and automatic reading of event information.

[0008] In some embodiments, it also includes a central switch and a remote communication management unit, the host computer sends control commands to the central switch and receives the uploaded information, the central switch sends power output commands to the test device and receives action parameters; the relay protection device sends information to the remote communication management unit and receives commands to activate and deactivate the protection pressure plate and modify the protection setting; the remote communication management unit receives control commands from the central switch and sends event information.

[0009] In some embodiments, the software structure of the automatic testing system includes an interface layer, a communication layer, an application layer, and a data layer.

[0010] In some embodiments, the interface layer includes an interface layer functional module, and the interface layer functional module is respectively connected to a communication monitoring module, a task specifying module, a task execution module and a report processing module. The communication monitoring module is used to establish a communication connection and monitor the communication status between the host computer and the test device and the relay protection device; the task formulation module is used to formulate test tasks; the task execution module is used to manage the start and pause of the test and to view the execution status of the test in real time; the report processing module is used to judge the test results after the test is completed and generate a test report.

[0011] In some embodiments, the communication layer includes a test device communication module and a relay protection device communication module. The test device communication module is used to establish communication between the host computer and the test device, so that the host computer can control the test device to output an analog quantity of electrical quantity and read the returned action signal; the relay protection device communication module is used to establish communication between the host computer and the relay protection device, so that the host computer can control the protection pressure plate of the relay protection device and modify the protection setting and read the information sent by the relay protection device.

[0012] In some embodiments, the application layer is used to complete the development of protection function test cases through a combination of basic modules and to implement functional testing of the relay protection device through a combination of protection function test cases.

[0013] In some embodiments, the data layer serves as a data input and output module for reading test values ​​and test parameters required during the test process and storing test data during the test process.

[0014] Another aspect of the present disclosure provides an automatic testing method for a relay protection device, comprising: formulating a test task through a host computer and controlling the relay protection device to put the protection pressure plate into operation and modify the protection setting, and then automatically generating test parameters according to the test setting, controlling the test device to output electrical analog data to be applied to the relay protection device to be tested, the relay protection device feedbacks its action information by returning a tripping signal to the test device and sending information to the host computer, and the host computer automatically records the test data and generates a test report to form a closed-loop test.

[0015] The disclosed embodiment designs the relay protection automatic test system in an overall manner, and provides the hardware and software design scheme of the relay protection automatic test system by analyzing the requirements of data interaction and system performance, thereby improving the automation level of the relay protection device test. In addition, the disclosed embodiment proposes a modular combination scheme of the test system, which realizes specific test functions through the combination of different basic modules, reduces the workload of system development and maintenance, and meets the diverse requirements of different protection function tests.

[0016] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0018] Figure 1 is a schematic diagram of a hardware architecture of an automatic test system for a relay protection device in an embodiment of the present disclosure;

[0019] Figure 2 is a schematic diagram of a flow chart for automatic testing of a relay protection device in an embodiment of the present disclosure;

[0020] Figure 3 is a schematic diagram of the system structure of an automatic test system for a relay protection device in another embodiment of the present disclosure;

[0021] Figure 4 is a schematic diagram of the system structure of an automatic test system for a relay protection device in another embodiment of the present disclosure;

[0022] Figure 5 is a schematic diagram of a software architecture in an automatic test system for a relay protection device in another embodiment of the present disclosure;

[0023] Figure 6 is a schematic diagram of an interface layer in a software architecture in an automatic test system for a relay protection device in another embodiment of the present disclosure;

[0024] Figure 7 It is a flow chart of a test process in an automatic test system for a relay protection device in another embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0026] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0028] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0029] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0030] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0031] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0033] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0034] The present disclosure provides an automatic testing system for a relay protection device. Figure 1-Figure 7 As shown, the automatic test system includes a hardware architecture and a software structure. The hardware architecture includes a host computer 1, a test device 2, and a relay protection device 3 to be tested. Here, the relay protection device 3 includes a protection pressure plate. Considering that the protection pressure plate needs to be frequently manually put in and out and the protection setting value needs to be modified during the manual test, the automatic test can be realized through this embodiment, so that the test system can control the relay protection device 3 to automatically put in and out the protection pressure plate and modify the protection setting value during the test.

[0035] Specifically, the host computer 1 here sends control commands to the test device 2 and the relay protection device 3, and receives test data generated by the test device 2 and information uploaded by the relay protection device 3. The test device 2 also sends collected analog quantities such as voltage and current, as well as switch quantities and other parameters to the relay protection device 3 and receives switch quantity data fed back by the relay protection device 3.

[0036] Specifically, the principle of the automatic testing system for relay protection devices involved in this embodiment is as follows: the corresponding test tasks are formulated through the automatic testing software installed on the host computer 1, and the relay protection device 3 is automatically controlled to put into the protection pressure plate and modify the protection setting value, and then the test parameters are automatically generated according to the test setting value, and the test device 2 is controlled to output voltage, current and other electrical analog data to be applied to the relay protection device 3 to be tested. The relay protection device 3 to be tested feeds back its action information by returning a tripping signal to the test device 2 and by sending information to the host computer 1. The host computer 1 automatically records the test data and generates a test report, thereby forming a closed-loop test.

[0037] Taking the test of a single protection function of the relay protection device 3 as an example, the automatic test process is as follows: Figure 2-4 As shown. First, the status of each device and system is checked, and the test can be started only after the status is confirmed to be correct; after selecting the test task, the automatic test starts, and the host computer 1 controls the relay protection device 3 to automatically put the protection pressure plate of the relay protection device 3 to be tested and modify the protection setting to the test setting. After the modification is successful, the test parameters are automatically generated according to the test setting to control the test device 2 to output the electrical quantity analog data; further determine whether the relay protection device 3 is in action, if it is in action, stop the output and automatically record the test data and analyze the test results, if the test task is not completed, continue to automatically control the test device 2 to test until the test is completed.

[0038] In some embodiments, the automatic test system for relay protection devices also includes a central switch 4 and a telecontrol communication management unit 5 to achieve communication interaction between hardware and to unify the communication protocol standards of protection devices. Here, the host computer 1 sends a control command to the central switch 4 and receives the uploaded information. The central switch 4 sends an electric quantity output command to the test device 2 and receives parameters such as action value and action time. The test device 2 sends analog quantities such as current and voltage, as well as switch quantities to the relay protection device 3 to be tested, and receives the switch quantity data fed back by the relay protection device 3. The relay protection device 3 sends information to the telecontrol communication management unit 5 and receives commands to activate and deactivate the protection pressure plate and modify the protection setting. The telecontrol communication management unit 5 receives control commands from the central switch 4 and sends event information.

[0039] Specifically, the host computer 1 here serves as the software control part of the automatic test system. On the one hand, it is used for the overall test management of the automatic test system and the related control of the test device 2, such as the input of test parameters, the formulation and execution of test tasks, the recording of test data, and the generation of test reports, etc. On the other hand, it is used for the control of the relay protection device 3 to be tested, such as the activation and deactivation of the protection pressure plate, the reading and writing of protection settings, and the reading of uploaded information.

[0040] The test device 2 serves as the core hardware of the automatic test system. It can output analog quantities such as voltage and current, as well as switch quantities, to be applied to the relay protection device 3 to be tested according to the control of the automatic test software in the host computer 1, and can receive information such as switch quantities fed back by the relay protection device 3, and then send the test results to the host computer 1, thereby realizing a closed-loop test.

[0041] The central switch 4 is mainly used to provide a channel for information interaction for the relay protection device 3 to be tested, the test device 2 and the host computer 1. Here, the communication between the host computer 1 and the relay protection device 3 is a prerequisite for the realization of automatic testing. Its main function is to realize the reading and writing of protection settings, the activation and deactivation of protection pressure plates, and the reading of test reports. The communication between the host computer 1 and the test device 2 enables the automatic testing software to control the test device 2 to output corresponding analog quantities and switch quantities, and read information such as test results.

[0042] Since the communication between the host computer 1 and the relay protection device 3 is the premise and guarantee for realizing automatic testing, and considering that different protection devices have certain differences in their communication protocols and message formats, in this embodiment, the remote communication management unit 5 is used as a bridge for communication between the host computer 1 and the relay protection device 3 to be tested, and the protocol message of the relay protection device 3 is converted to realize the unification of the communication protocol format, thereby avoiding the differences in the communication protocols of different relay protection devices 3 and improving the versatility of the automatic testing system.

[0043] The software part of the automatic test system of this embodiment is set up on the basis of the above-mentioned hardware part architecture. Specifically, the requirements for the software's interactive interface and performance are first analyzed. Here, the requirements for the system's interactive interface need to be considered. Specifically, the automatic test software is one of the cores of the entire automatic test system. Users achieve the test purpose by directly operating the software interface. The rationality of the software interface design is particularly important. The software interface operation process should be as follows:

[0044] (1) Before testing the relay protection device 3 to be tested, the tester should be able to set up the communication connection between the test software and the relay protection device 3 and the test device 2;

[0045] (2) After the communication connection is completed, the tester should be able to select the test device 2 and the specific protection test items of the test device 2, and can select the test mode of the relay protection device 3;

[0046] (3) After completing the configuration of specific test parameters, the test is started. During the test, the automatic test program automatically controls the test device 2 to output the corresponding electrical analog data according to the test parameters and applies it to the relay protection device 3. After the relay protection device 3 is actuated, the relevant action information is transmitted to the host computer 1;

[0047] (4) During the test process, the test software is required to monitor the test progress and current test items at all times, and the tester can pause and resume the test at any time;

[0048] (5) After the test is completed, there should be corresponding prompts and the test report can be read.

[0049] According to the above basic test process, we can get the following Figure 4 The schematic diagram of the use case of the system test interactive interface shown in the figure, the interactive interface here requires at least the following basic functions: communication connection, test device selection, test item selection, test start, test pause, process display, test report viewing, etc. Among them, the communication connection should include the connection between the host computer 1 and the test device 2 and the relay protection device 3. The interface should be equipped with a connection button and be able to display the connection status to facilitate the tester to observe the communication status; after selecting the test device 2, it should be able to automatically display the protection function test items under the device and be able to select the test items or all tests; the process display requires that the interface should be able to display the test process and test progress in real time; after the test is completed, the test report should be able to be viewed, and the report can be saved or exported.

[0050] The automatic test system of this embodiment also needs to consider system performance requirements in terms of software setting. Specifically, in order to ensure that the automatic test system can operate safely, stably and reliably for a long time, the automatic test system should meet the following performance requirements:

[0051] (1) The automatic test system should have a reasonable software structure. The system structure should be multi-layered, compact and scalable, capable of making reasonable use of resources, and minimizing program redundancy during the development process;

[0052] (2) The automatic test system should have a fast response capability. Some protection function tests have high real-time requirements. Considering the communication connection between the host computer 1, the relay protection device 3 and the test device 2, it is necessary to ensure the response speed of the test system and use advanced implementation technology as much as possible to maximize the system's response capability.

[0053] (3) The automatic test system should have good scalability and maintainability. The development of the relay protection technology may lead to the addition and deletion of relay protection functions. Therefore, the automatic test system should have a certain degree of scalability so that it can be applied to the testing of different relay protection devices 3 and facilitate the test developers to add new test functions;

[0054] (4) The automatic test system should have a rights management function. Different personnel should be given different operating permissions after logging into the system, and the automatic test system should be able to record the information of the tester during the test process.

[0055] (5) The automatic test system should have a friendly human-computer interaction interface. The human-computer interface is the most direct embodiment of the interaction between the tester and the test system. A concise, clear, and intelligent software interface helps the tester to easily and conveniently formulate test tasks and complete automatic testing. The human-computer interface must not only meet the test requirements, but also be user-friendly and simple to operate, so as to improve the human-computer interaction function and the operability of the system, and provide convenience for users as much as possible.

[0056] Furthermore, the automatic test system of this embodiment also needs to consider the analysis of communication function requirements in terms of software. Specifically, the information interaction between the devices in the automatic test system is the premise and guarantee for the realization of automatic testing. Therefore, two aspects of communication requirements are mainly considered, namely, the communication between the host computer 1 and the test device 2 and the communication between the host computer 1 and the relay protection device 3. Among them, for the communication between the host computer and the test device 2, the host computer 1 calculates the test task formulated by the user according to a certain test logic to obtain the current, voltage and other electrical quantity values ​​that need to be output, and controls the test device 2 to output the electrical quantity analog quantity and the switch quantity to the relay protection device 3 to be tested, so as to perform the functional test of the relay protection device 3.

[0057] On the one hand, the communication connection between the host computer 1 and the test device 2 is the primary task of automatic test software development. On the basis of establishing the communication connection, the following functions should be completed according to the test requirements:

[0058] (1) Controlling the output voltage, current and other analog quantities of the test device 2. Controlling the output analog quantities of the test device 2 by automatic test software is a basic condition for test execution, and it is required to be able to control the output channels of all analog quantities such as voltage and current of the test device 2;

[0059] (2) Control the DC output and switch output of the test device 2. When testing some protection functions of the relay protection device 3, it is necessary to determine the position of the circuit breaker. Therefore, the automatic test system is required to simulate the closed and open position signals of the circuit breaker by controlling the DC output module and the switch output module;

[0060] (3) Read the switch input state of the test device 2 in real time. When testing the protection function of the relay protection device 3, the trip node of the relay protection device 3 is connected to the switch input module of the test device 2. When a protection action occurs, the trip node is closed, and the corresponding switch state of the test device 2 also changes accordingly, thereby measuring the protection action value. Therefore, the ability of the automatic test software to read the switch state of the test device 2 in real time is a prerequisite for the execution of the test.

[0061] (4) Obtaining accurate action time: The action time of the relay protection device 3 is generally in the millisecond level, so the automatic test system is required to obtain accurate action time.

[0062] On the other hand, for the communication between the host computer 1 and the relay protection device 3 to be tested, the automatic test system requires that no manual intervention is required during the test process, and the test software can automatically operate the relay protection device 3. Therefore, the communication connection between the host computer 1 and the relay protection device 3 to be tested is a prerequisite for realizing automatic testing. The functions to be realized after the communication connection are as follows:

[0063] (1) Automatically throw in and out the protection pressure plate. In the manual test process, before the protection function test, the protection device needs to be manually operated to withdraw other protection pressure plates and throw in the protection pressure plate to be tested. The realization of the automatic test of the protection function here requires that the automatic test software can control the relay protection device 3 to automatically throw in and out the protection pressure plate;

[0064] (2) Automatic reading and writing of fixed values. In the manual test process, the protection device needs to be manually operated to modify the fixed values ​​before the protection function test. If automatic testing is to be implemented, the test software is required to automatically read and write the protection fixed values ​​of the relay protection device 3.

[0065] (3) Automatically read event information, where the event information includes fault reports, event reports, alarm information, etc. The reading of fault reports and event reports is helpful for analyzing the specific test process and test results, and checking whether the formats of fault reports and event reports meet the standard requirements. The automatic reading of alarm information is the premise and guarantee for realizing the alarm protection function test.

[0066] The automatic test system of this embodiment also needs to consider the test function requirement analysis in terms of software. Specifically, the object of the automatic test system is the relay protection device 3, and the purpose is to test its specific protection function to verify its reliability. The relay protection device 3 in this embodiment uses the change characteristics of the electrical quantity before and after the power supply system fails or operates abnormally as the judgment basis for action. The change characteristics of the electrical quantity during failure or abnormal operation include the increase of current, the decrease of voltage, the change of measurement impedance, the appearance of zero-sequence component, etc.

[0067] The basic principle of testing the relay protection device in the power supply system is to simulate the changes in electrical quantities when the power supply system is abnormal and fails, and record whether the relay protection device can make corresponding responses such as alarms and tripping according to standards and regulations, so as to determine whether its function meets the standard specifications. At present, the relay protection devices widely used in power supply systems include: transformer protection devices, feeder protection devices, AT protection devices, etc. According to the different protection principles, the protection functions of the above devices are classified and summarized. As shown in Table 2-1, the protection types of the protection devices can be divided into overcurrent type, voltage loss type, alarm type, impedance type, differential type, reclosing type, fault distance measurement type, etc. Therefore, the automatic test system of this embodiment should be able to test the protection functions of different types of relay protection devices. The automatic test system can develop corresponding general basic modules according to various types of protection, and complete the test of specific protection functions through the call of basic modules.

[0068] Based on the hardware architecture, the automatic test software architecture of the automatic test system is designed. Specifically combined with the demand analysis of the automatic test system, the automatic test software is designed from the aspects of software interface function, communication function, test function and data interaction function. The architecture design is divided into 4 layers, such as Figure 5 As shown in the figure, they are interface layer, communication layer, application layer and data layer. The specific module function design of each layer is as follows:

[0069] (1) Interface layer: The interface layer is mainly used for human-computer interaction. The specific structure is as follows: Figure 6As shown, it includes an interface layer function module, which is respectively connected to a communication monitoring module, a task specifying module, a task execution module and a report processing module, wherein the tester completes the relevant test task formulation and execution functions through the interface layer function module; the main function of the communication monitoring module is to establish a communication connection and monitor the communication status between the host computer 1 and the test device 2 and the relay protection device 3; the function of the task formulation module is to formulate test tasks, such as selecting the test device 2, test items, etc.; the function of the task execution module is to manage the start and pause of the test and to view the execution status of the test in real time; the main function of the report processing module is to judge the test results after the test is completed and generate a test report.

[0070] (2) Communication layer. The communication layer mainly includes a test device communication module and a relay protection device communication module. The function of the test device communication module is mainly to establish communication between the host computer 2 and the test device 2, so that the host computer 1 can control the test device 2 to output analog quantities such as voltage and current and read the returned action signal; the function of the relay protection device communication module is mainly to establish communication between the host computer 1 and the relay protection device 3, so that the host computer 1 can control the relay protection device 3 to put in and out the protection pressure plate, modify the protection setting value, and read the information sent by the relay protection device 3.

[0071] (3) Application layer: The application layer includes the development process of specific protection function test, and completes the development of protection function test cases through the combination of basic modules, and then completes the functional test of the entire relay protection device 3 through the combination of protection function test cases. The realization of automatic testing depends on the cooperation of the communication layer and data layer module functions. The main function of the data access module is to read test values ​​and test parameters and other data from the data layer, and store test data during the test process.

[0072] (4) Data layer: The data layer is the data input and output module of the entire automatic test system. As the input part of the system, the test constants and test parameters required during the test process must be read from the data layer; as the output part of the system, the test data during the test process are stored in the data layer.

[0073] The various levels in the software architecture of the above-mentioned automatic testing system are closely linked. The data layer provides guarantee for data interaction at other levels. The interface layer is the setter of the test tasks, and the communication layer and application layer are the executors of the test tasks. They cooperate with each other to jointly build the automatic testing software system.

[0074] The test device 2 in the automatic test system is mainly composed of a test module, which is the smallest unit for implementing a specific protection function test. The test modules here are divided into a communication test module and a test device test module. The main function of the communication test module is to implement the insertion and withdrawal of the protection pressure plate and the modification of the protection setting value in the relay protection device 3 to be tested; the test device test module mainly controls the test device 2 to output the corresponding test power to be applied to the relay protection device 3 to be tested, and to receive the trip signal after the protection is activated, record the action value and action time, etc.

[0075] The implementation process of automatic testing here is as follows Figure 7 As shown, it mainly includes three parts, namely, the writing of protection function test cases, the formulation of test plans, and the execution of automatic tests. The writing of protection function test cases is to analyze the test requirements of the specific protection function of the relay protection device 3 to be tested, and then develop the basic modules of the corresponding protection functions according to its test requirements. Among them, a complete test of the relay protection device 3 requires a combination of multiple basic modules, so it is often necessary to call multiple protection function test cases to complete, which includes the steps of protection function test analysis, test item definition, basic module combination, and protection test case establishment; the formulation of the test plan is to establish a complete test plan for the specific relay protection device 3 by combining different protection function test cases, and finally achieve the effect of one-button automatic testing, which includes the steps of equipment type selection, protection function selection, and test parameter configuration; the execution of automatic testing is that when the writing of the protection function test case is completed, the test is automatically performed according to the test plan, and the test data information of each item is automatically recorded during the test. After the test is completed, the corresponding test report is automatically generated, which includes the steps of test plan import, automatic test execution, and test report generation.

[0076] The disclosed embodiment has made an overall design for the relay protection automatic test system, and through the demand analysis of data interaction and system performance, it has provided the hardware and software design scheme of the relay protection automatic test system, and improved the automation degree of the test. In addition, the disclosed embodiment has proposed a modular combination scheme of the test system, and realized specific test functions through the combination of different basic modules, which has reduced the workload of system development and maintenance, and at the same time met the diverse requirements of different protection function tests.

[0077] In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0079] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present disclosure.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An automatic test system for a relay protection device, characterized in that: The hardware architecture of the automatic test system includes a host computer, which is communicatively connected to a test device and a relay protection device to be tested. The host computer sends power control commands to the test device and control commands for launching and withdrawing protection pressure plates and modifying protection constants to the relay protection device, and receives test data generated by the test device and action information uploaded by the relay protection device. The test device sends collected power analog quantities and switch quantities to the relay protection device and receives switch quantity data fed back by the relay protection device.

2. The automatic testing system according to claim 1, characterized in that: The test device at least includes a communication test module and a test device test module. The communication test module is used to realize the activation and deactivation of the protection pressure plate in the relay protection device and the modification of the protection setting value; the test device test module is used to output the corresponding test power to be applied to the relay protection device and to receive the tripping signal and record the action parameters after the protection is activated.

3. The automatic testing system according to claim 1, characterized in that: The communication connection between the host computer and the test device is used to at least meet the following functions: control the test device to output the analog quantity of electrical quantity, control the DC output and the switch output of the test device; read the switch input status of the test device in real time and obtain the accurate action time; the communication connection between the host computer and the relay protection device is used to at least meet the following functions: automatic activation and deactivation of the protection pressure plate, automatic reading and writing of protection set values, and automatic reading of event information.

4. The automatic testing system according to claim 1, characterized in that: It also includes a central switch and a telecontrol communication management unit, the host computer sends control commands to the central switch and receives the sent information, the central switch sends power output commands to the test device and receives action parameters; the relay protection device sends information to the telecontrol communication management unit and receives commands to activate and deactivate protection pressure plates and modify protection settings; the telecontrol communication management unit receives control commands from the central switch and sends event information.

5. The automatic testing system according to claim 1, characterized in that: The software architecture of the automatic testing system includes an interface layer, a communication layer, an application layer and a data layer.

6. The automatic testing system according to claim 5, characterized in that: The interface layer includes an interface layer functional module, which is respectively connected to a communication monitoring module, a task specifying module, a task execution module and a report processing module. The communication monitoring module is used to establish a communication connection and monitor the communication status between the host computer and the test device and the relay protection device; the task formulation module is used to formulate test tasks; the task execution module is used to manage the start and pause of the test and to view the execution status of the test in real time; the report processing module is used to judge the test results after the test is completed and generate a test report.

7. The automatic testing system according to claim 5, characterized in that: The communication layer includes a test device communication module and a relay protection device communication module. The test device communication module is used to establish communication between the host computer and the test device, so that the host computer can control the test device to output the analog quantity of electrical quantity and read the returned action signal; the relay protection device communication module is used to establish communication between the host computer and the relay protection device, so that the host computer can control the protection pressure plate of the relay protection device and modify the protection setting value and read the information sent by the relay protection device.

8. The automatic testing system according to claim 5, characterized in that: The application layer is used to complete the development of protection function test cases through the combination of basic modules and to implement the functional test of the relay protection device through the combination of protection function test cases.

9. The automatic testing system according to claim 5, characterized in that: The data layer serves as a data input and output module, and is used for reading test values ​​and test parameters required during the test process and storing test data during the test process.

10. An automatic testing method for a relay protection device, characterized in that: include: The host computer formulates the test task and controls the relay protection device to put into operation the protection pressure plate and modify the protection setting value, and then automatically generates the test parameters according to the test setting value. The test device is controlled to output the electrical analog data to be applied to the relay protection device to be tested. The relay protection device feeds back its action information by returning a tripping signal to the test device and sending information to the host computer. The host computer automatically records the test data and generates a test report to form a closed-loop test.

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