Test equipment for generator-transformer unit protection device of pumped storage power station

Abstract

This application relates to a testing device for a generator-transformer unit protection device in a pumped storage power station. The testing device includes: a main control computing unit, and an analog quantity testing unit and a digital quantity testing unit connected to the main control computing unit. The analog quantity testing unit and the digital quantity testing unit are connected to the generator-transformer unit protection device through a first test interface and a second test interface, respectively. The main control computing unit stores a test template library and is configured to: determine test cases based on the test template library; according to the test cases, control the digital quantity testing unit to inject a first digital quantity into the generator-transformer unit protection device and collect a second digital quantity output by the generator-transformer unit protection device; according to the test cases, control the analog quantity testing unit to inject a first analog quantity into the generator-transformer unit protection device and collect a second analog quantity output by the generator-transformer unit protection device; and generate test analysis results based on the second digital quantity and the second analog quantity. This method can improve testing efficiency.

Description

Technical Field

[0001] This application relates to the field of safety technology for pumped storage power stations, and in particular to a test device for a generator-transformer protection device in a pumped storage power station. Background Technology

[0002] Pumped storage units have multiple operating conditions, including power generation, pumping, and SFC start-up. The generator-transformer unit protection can monitor the unit's operating status at all times, ensuring the unit's safe and stable operation under various complex conditions.

[0003] The protection logic of the generator-transformer unit varies significantly under different operating conditions. However, in traditional technology, the testing method for the protection device of the generator-transformer unit in pumped storage power stations is still mainly manual testing. This testing method is inefficient, error-prone, time-consuming, labor-intensive, and has poor data traceability. It is difficult to cover the protection logic of pumped storage units under different operating conditions, and the switching between multiple operating conditions is quite complex. This results in low efficiency in the maintenance and testing of the protection device of the generator-transformer unit in pumped storage power stations, which makes it difficult to ensure the safe operation of pumped storage units in the power system and cannot meet the needs of the rapid development of pumped storage and the construction of digital and intelligent relay protection. Summary of the Invention

[0004] Therefore, it is necessary to provide a test device for the generator-transformer protection device of a pumped storage power station to address the above-mentioned technical problems, in order to improve the testing efficiency of the generator-transformer protection device of the pumped storage power station.

[0005] This application provides a test device for the protection device of the generator-transformer unit in a pumped storage power station, the test device comprising:

[0006] The system includes a main control computing unit, an analog quantity testing unit, and a digital quantity testing unit. Both the analog quantity testing unit and the digital quantity testing unit are connected to the main control computing unit. The analog quantity testing unit is connected to the generator-transformer group protection device through a first test interface, and the digital quantity testing unit is connected to the generator-transformer group protection device through a second test interface.

[0007] The main control computing unit stores a test template library, and the main control computing unit is configured as follows:

[0008] Based on the test template library, determine the test cases for the generator-transformer group protection device;

[0009] According to the test case, the switch quantity test unit is controlled to inject the first switch quantity configured in the test case into the generator-transformer group protection device, and to collect the second switch quantity output by the generator-transformer group protection device in response to the first switch quantity.

[0010] According to the test case, the analog quantity test unit is controlled to inject the first analog quantity configured in the test case into the generator-transformer group protection device, and to collect the second analog quantity output by the generator-transformer group protection device in response to the first analog quantity.

[0011] Based on the second switch quantity and the second analog quantity, test analysis results are generated.

[0012] In one embodiment, the analog quantity testing unit includes an analog signal switching device and an analog signal transmitting device connected to the main control computing unit, wherein:

[0013] The control terminal of the analog signal switching device is connected to the main control computing unit, and the analog signal switching device is connected in series between the analog signal transmitting device and the first test interface to conduct or disconnect the signal channel between the analog signal transmitting device and the first test interface, so as to control the generator-transformer protection device to switch the unit operating conditions of the pumped storage power station.

[0014] In one embodiment, the analog signal transmitting device has multiple signal channels with the first test interface, and the analog signal switching device includes a relay matrix, with each relay in the relay matrix connected in series in one of the corresponding signal channels.

[0015] In one embodiment, the multiple signal channels include 6 signal input channels and 18 signal output channels.

[0016] In one embodiment, the switch quantity test unit includes an input channel connected to the second test interface via an opto-isolation circuit, and an output channel connected to the second test interface via a relay drive circuit;

[0017] The input channel is connected to the main control computing unit through the opto-isolation circuit and is configured to transmit the acquired second switch quantity to the main control computing unit.

[0018] The output channel is connected to the main control computing unit through the relay driving circuit and is configured to receive control commands from the main control computing unit and output the first switching quantity corresponding to the control commands.

[0019] In one embodiment, the switch quantity test unit includes an event sequence record (SOE) circuit connected to an external interrupt interface of the main control computing unit, the event sequence record (SOE) circuit being configured to record microsecond-level event timestamps.

[0020] In one embodiment, the testing device further includes a human-computer interaction unit, the front panel of which is provided with a touch screen, physical function buttons, status indicator lights and a speaker connected to the main control computing unit.

[0021] In one embodiment, the testing device further includes a portable case and a handle, the two ends of which are rotatably connected to fixed parts disposed on opposite sides of the portable case via rotating parts.

[0022] In one embodiment, the testing equipment further includes:

[0023] The synchronization time unit is connected to the main control computing unit and is configured to output standard timestamps through the BeiDou Navigation Satellite System and the Global Positioning System.

[0024] In one embodiment, the testing equipment further includes:

[0025] The power management unit includes multiple isolated DC power supplies, and the power management unit is configured to independently power the main control computing unit, the analog quantity testing unit and the switch quantity testing unit through each of the isolated DC power supplies.

[0026] The testing equipment for the generator-transformer unit protection device of the aforementioned pumped storage power station, through its main control computing unit, can inject the corresponding analog and digital quantities into the generator-transformer unit protection device based on the test cases determined by the test template library, through the analog quantity test unit and the digital quantity test unit. Based on the digital and analog quantities corresponding to the response actions of the generator-transformer unit protection device, it generates test analysis results. This enables efficient and accurate transmission of test parameters during the testing process of the generator-transformer unit protection device, and allows for in-depth simulation and verification of the action response and handling of the generator-transformer unit protection device under different conditions, thereby significantly improving the testing efficiency of the generator-transformer unit protection device of the pumped storage power station. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a test device for a generator-transformer protection device of a pumped storage power station in one embodiment;

[0029] Figure 2This is a schematic diagram of the structure of an analog quantity test unit in one embodiment;

[0030] Figure 3 This is a schematic diagram of the structure of a switch quantity test unit in one embodiment;

[0031] Figure 4 This is a schematic diagram of the human-computer interaction unit in one embodiment;

[0032] Figure 5 This is a schematic diagram of the appearance of the test equipment for a generator-transformer protection device of a pumped storage power station in one embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10-Test equipment, 110-Main control computing unit, 120-Analog quantity test unit, 121-Analog signal switching device, 122-Analog signal transmitting device, 123-First test interface, 130-Switch quantity test unit, 131-Input channel, 132-Output channel, 133-Second test interface, 140-Human machine interaction unit, 151-Portable housing, 152-Handle, 20-Generator-transformer group protection device. Detailed Implementation

[0035] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0037] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0038] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0039] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0040] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that terms such as “comprising / including” or “having” specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0041] Pumped storage units possess multi-condition operating characteristics, including power generation, pumping, and SFC (Static Frequency Converter) startup. The protection logic for these units varies significantly under different conditions. However, current testing of protection devices for large pumped storage power stations still largely relies on manual methods. Traditional manual testing is inefficient, error-prone, time-consuming, labor-intensive, and lacks data traceability. In particular, the protection logic for different operating conditions of pumped storage units is difficult to cover all conditions, and the signal switching between multiple conditions is complex. This results in low efficiency in the maintenance and testing of protection devices for pumped storage power stations, hindering the improvement of the intelligence level of routine maintenance and the safety and reliability of unit operation. It is no longer suitable for the rapid development of pumped storage and the demand for digital relay protection.

[0042] Based on this, this application provides a test device for the protection device of the generator-transformer unit in a pumped storage power station. This portable test device can simulate the multi-state operating conditions of the generator-transformer unit in a pumped storage power station. By switching the switch and analog signals of different operating conditions, it covers different typical pumped storage operating conditions such as shutdown, power generation, pumping, power generation phase adjustment, and pumping phase adjustment of the generator-transformer unit in the pumped storage power station. This enables automatic testing of the protection logic function of the protection device of the generator-transformer unit in a large pumped storage power station under multiple operating conditions and automatically generates a verification report. This provides technical support for intelligent operation and maintenance of the generator-transformer unit protection of pumped storage power stations, improvement of maintenance efficiency, and safe and stable operation of the power grid.

[0043] In one exemplary embodiment, such as Figure 1 As shown, a test device 10 for the protection device of the generator-transformer unit of a pumped storage power station is provided. The test device 10 includes:

[0044] The main control computing unit 110, the analog quantity testing unit 120, and the digital quantity testing unit 130 are all connected to the main control computing unit 110. The analog quantity testing unit 120 is connected to the generator-transformer group protection device 20 through the first test interface; the digital quantity testing unit 130 is connected to the generator-transformer group protection device 20 through the second test interface.

[0045] The main control computing unit 110 stores a test template library. The main control computing unit is configured to: determine test cases for the generator-transformer group protection device according to the test template library; according to the test cases, control the switch quantity test unit to inject the first switch quantity configured in the test cases into the generator-transformer group protection device, and collect the second switch quantity output by the generator-transformer group protection device in response to the first switch quantity; according to the test cases, control the analog quantity test unit to inject the first analog quantity configured in the test cases into the generator-transformer group protection device, and collect the second analog quantity output by the generator-transformer group protection device in response to the first analog quantity; and generate test analysis results based on the second switch quantity and the second analog quantity.

[0046] The main control computing unit 110 and the analog quantity testing unit 120 can be connected via a high-speed LVDS waveform bus and an isolated GPIO control bus to transmit waveform data and channel switching commands to the analog quantity testing unit 120. The main control computing unit 110 and the digital quantity testing unit 130 can be connected via a high-speed GPIO isolated bus to transmit digital quantity control signals and acquisition status to the digital quantity testing unit 130.

[0047] Preferably, the main control computing unit 110 can be configured with an industrial-grade high-performance processor (such as an ARM Cortex-A72 main control motherboard), 8GB of memory, 64GB of solid-state storage, a gigabit internal switching chip, multi-channel LVDS (Low-Voltage Differential Signaling) waveform output interface, GPIO (General Purpose Input / Output) isolated control bus, and multiple sets of high-speed communication buses, supporting Windows / Linux dual-system operation. The front panel of the main control computing unit 110 can bring out two gigabit Ethernet ports, four USB 3.0 ports, at least one HDMI (High-Definition Multimedia Interface) port, and at least one RS485 / RS232 serial port, supporting multiple communication protocols in the IEC61850 full protocol stack (i.e., MMS / GOOSE / SV full protocol stack).

[0048] Understandably, the main control computing unit 110, as the core of the overall control of the test equipment 10, can also be called the main control unit or controller. It has a built-in test template library for the generator-transformer unit protection device. The test templates can be pre-set with test cases, configurable test parameters, test configuration parameters, protection settings, control words, and other information. They can cover different operating conditions in pumped storage power stations, such as generator-transformer unit shutdown, generation, pumping, generation phase modulation, pumping phase modulation, driving, being driven, and electrical braking, providing test cases for differential protection, reverse power protection, over-excitation protection, grounding protection, impedance protection, and other protection functions for different faults in the generator-transformer unit protection device. The test templates can be visually compiled and customized through the human-machine interface unit, and the test templates or test items can be saved as reusable test project files.

[0049] In some embodiments, the main control computing unit 110 can respond to a test-ready operation for the generator-transformer unit protection device in a pumped storage power station, determine test cases for the generator-transformer unit protection device according to a preset test template library; test the action response of the generator-transformer unit protection device under different unit operating conditions of the pumped storage power station according to the test cases, and obtain unit operating condition test results; test the protection performance of the generator-transformer unit protection device for different protection types of the pumped storage power station according to the test cases, and obtain protection function test results; test the fault response of the generator-transformer unit protection device for different simulated fault types of the pumped storage power station according to the test cases, and obtain system fault test results; and analyze the unit operating condition test results, protection function test results, and system fault test results to obtain test analysis results for the generator-transformer unit protection device.

[0050] Afterwards, the main control computing unit 110 can restore the parameters of the generator-transformer group protection device to the original state before the test according to the original state backup file of the generator-transformer group protection device, and obtain the restoration result; according to the original state backup file, the restoration result is verified to obtain the verification result; if there is no deviation in the verification result, in response to the restoration confirmation operation of the generator-transformer group protection device, a standardized test report is generated according to the test analysis results.

[0051] Understandably, during the testing of the generator-transformer unit protection device, the main control computing unit 110 sends communication transmission commands to the switch quantity testing unit and the analog quantity testing unit to send or receive test parameters (switching quantities, analog quantities and / or digital quantities of electrical quantities) corresponding to the test conditions to the generator-transformer unit protection device and / or the generator-transformer unit of the pumped storage power station. During the unit operating condition test, protection function test, and system fault test, based on the second switching quantity output by the generator-transformer unit protection device in response to the first switching quantity, and the second analog quantity output by the generator-transformer unit protection device in response to the first analog quantity, the unit operating condition test results, protection function test results, and system fault test results can be obtained respectively. Furthermore, the main control computing unit 110 can process and analyze the data to obtain test analysis results. Therefore, the main control computing unit 110 can carry out all automatic testing functions, realizing full-process control of test process scheduling, waveform data calculation, protocol parsing, data processing, report generation, and human-machine interaction.

[0052] Optionally, based on test cases, the action response of the generator-transformer unit protection device is tested for different unit operating conditions of the pumped storage power station to obtain unit operating condition test results. Specifically, the main control computing unit 110 can acquire the switching and electrical characteristics of the pumped storage power station, and through the generator-transformer unit protection device, identify the current unit operating condition of the pumped storage power station based on the switching and electrical characteristics; according to the operating condition instructions in the test cases for the current unit operating condition, the action response of the generator-transformer unit protection device for the current unit operating condition is tested, and the current action response data corresponding to the current unit operating condition is obtained; according to the test cases... The operating condition switching sequence adjusts the switching and electrical characteristics to switch the current unit operating condition to another unit operating condition different from the current unit operating condition. This other unit operating condition is then used as the new current unit operating condition. The process then returns to execute the steps outlined in the test cases for the current unit operating condition, testing the action response of the generator-transformer unit protection device for that condition. This process continues until all unit operating conditions in the operating condition switching sequence have been tested, obtaining the current action response data for each unit operating condition. Based on this current action response data, the unit operating condition test results are obtained.

[0053] The testing equipment for the generator-transformer unit protection device of the aforementioned pumped storage power station includes a main control computing unit, an analog quantity testing unit, and a digital quantity testing unit. Both the analog quantity testing unit and the digital quantity testing unit are connected to the main control computing unit. The analog quantity testing unit is connected to the generator-transformer unit protection device through a first test interface, and the digital quantity testing unit is connected to the generator-transformer unit protection device through a second test interface. The main control computing unit stores a test template library and is configured to: determine test cases for the generator-transformer unit protection device based on the test template library; according to the test cases, control the digital quantity testing unit to inject the first digital quantity configured for the test cases into the generator-transformer unit protection device, and collect the second digital quantity output by the generator-transformer unit protection device in response to the first digital quantity; according to the test cases, control the analog quantity testing unit to inject the first analog quantity configured for the test cases into the generator-transformer unit protection device, and collect the second analog quantity output by the generator-transformer unit protection device in response to the first analog quantity; and generate test analysis results based on the second digital quantity and the second analog quantity. Therefore, the technical solution of this application, through the main control computing unit of the test equipment, can inject the analog and digital quantities corresponding to the test cases for the generator-transformer group protection device according to the test cases determined by the test template library, through the analog quantity test unit and the digital quantity test unit, and generate test analysis results based on the digital and analog quantities corresponding to the response actions of the generator-transformer group protection device. It can achieve efficient and accurate transmission of test parameters in the test process of the generator-transformer group protection device, and can deeply simulate and verify the action response and handling of the generator-transformer group protection device under different conditions, thereby significantly improving the test efficiency of the generator-transformer group protection device of pumped storage power station.

[0054] In one exemplary embodiment, such as Figure 2 As shown, the analog quantity test unit 120 includes an analog signal switching device 121 and an analog signal transmitting device 122 connected to the main control computing unit. The control terminal of the analog signal switching device is connected to the main control computing unit 110, and the analog signal switching device 121 is connected in series between the analog signal transmitting device 122 and the first test interface 123. It is used to connect or disconnect the signal channel between the analog signal transmitting device 122 and the first test interface 123 to control the generator-transformer protection device 20 to switch the unit operating conditions of the pumped storage power station.

[0055] The analog signal transmitting device 122 has multiple signal channels between itself and the first test interface 123. The analog signal switching device 121 includes a relay matrix, and each relay in the relay matrix is ​​connected in series in a corresponding signal channel.

[0056] The analog quantity test unit 120, also known as the multi-phase analog quantity generation and switching unit, is an integrated unit for signal generation and automatic switching. It can achieve high-precision analog waveform output, multi-channel lossless automatic switching, and output closed-loop calibration for different pumped storage operating conditions such as shutdown, power generation, pumping, power generation phase adjustment, and pumping phase adjustment of the generator-transformer unit in pumped storage power stations. It meets the synchronous testing requirements of multiple protection circuits of pumped storage generator-transformer units.

[0057] As one possible implementation, the analog test unit 120 may include a 12-phase high-precision voltage DAC (digital-to-analog converter) channel, an 18-phase high-current DAC channel, a power amplifier circuit, a closed-loop sampling feedback circuit, a signal automatic switching relay matrix, an optocoupler isolation drive circuit, and a channel independent protection circuit, etc.

[0058] The analog quantity test unit 120 has its input terminal connected to the LVDS waveform bus of the main control unit to receive waveform digital data from the main control computing unit 110. The control terminal of the analog quantity test unit 120 is connected to the main control computing unit 110 via an isolated GPIO bus to receive channel switching commands from the main control computing unit 110. The feedback terminal of the analog quantity test unit 120 is connected to the main control computing unit 110 via an ADC channel interface to achieve closed-loop calibration of the output signal.

[0059] Preferably, the signal automatic switching relay matrix includes multiple signal channels, including 6 signal input channels and 18 signal output channels. When automatically switching the output voltage and current signals under different operating conditions of the pumped storage power station, the signal automatic switching relay matrix can achieve at least 6-phase voltage and 6-phase current interface inputs, and 12-phase voltage and 18-phase current interface outputs.

[0060] The front panel of the analog test unit 120 can provide 12-phase voltage output terminals and 18-phase current output terminals. The terminals can use standard 4mm banana plugs or pluggable full-pass bullet plugs. The terminals have clear color markings to prevent mis-insertion, and different phase output terminals are clearly labeled. Voltage output accuracy is ≤±0.05% FS, with amplitude continuously adjustable from 0~120V AC to 0~300V DC; current output accuracy is ≤±0.05% FS, with amplitude continuously adjustable from 0~30A AC to 0~10A DC; inter-channel synchronization error is ≤1μs; signal switching action time is ≤5ms; contact resistance is ≤50mΩ; and it can support arbitrary combinations of 6 inputs to 18 outputs. Therefore, the analog test unit 120 can simulate 12-phase voltage signal sources and 18-phase current signal sources through independent signal channels. Each phase voltage or current should be independently configurable, of either AC or DC type, and with independently and continuously adjustable amplitude, phase, and frequency.

[0061] In one exemplary embodiment, such as Figure 3 As shown, the switch quantity test unit 130 includes an input channel 131 connected to the second test interface 133 via an opto-isolation circuit, and an output channel 132 connected to the second test interface 133 via a relay drive circuit.

[0062] The input channel 131 is connected to the main control computing unit 110 through an opto-isolation circuit and is configured to transmit the acquired second switching quantity to the main control computing unit; the output channel 132 is connected to the main control computing unit 110 through a relay drive circuit and is configured to receive the control command from the main control computing unit and output the first switching quantity corresponding to the control command.

[0063] The switch quantity test unit 130, also known as the switch quantity IO unit, serves as a switch quantity signal acquisition and output unit. It can acquire trip / operation signals of the transformer protection device under test, output the simulated circuit breaker position / plate status, and accurately record microsecond-level SOE (Sequence Of Event) events. It can support circuit breaker operation timing simulation and protection plate status simulation.

[0064] In one exemplary embodiment, the switch quantity test unit includes an event sequence recording (SOE) circuit connected to an external interrupt interface of the main control computing unit. The event sequence recording circuit is configured to record microsecond (μs) level event timestamps. Preferably, the SOE event recording resolution is ≤1μs.

[0065] For example, the input channel of the switch quantity test unit 130 can be connected to the GPIO interface of the main control computing unit 110 through an opto-isolation circuit to transmit the acquired switch quantity status to the main control unit; the switch quantity input supports 0~250V AC / DC signal acquisition, and the opto-isolation voltage is ≥2.5kV. The output channel of the switch quantity test unit 130 can be connected to the GPIO interface of the main control computing unit 110 through a relay drive circuit to receive control commands and output corresponding switch quantity signals; the switch quantity output contact capacity is ≥250V / 5A, supporting load switching of switch quantity signals. Therefore, for different pumped storage operating conditions such as shutdown, power generation, pumping, power generation phase adjustment, and pumping phase adjustment of the generator-transformer unit in a pumped storage power station, the switch quantity test unit can realize the input, output, and switching of switch quantity signals matched to different operating conditions.

[0066] Preferably, the switch quantity test unit 130 may include 32 opto-isolated input channels, 32 relay output channels, an SOE event recording circuit, an input signal conditioning circuit, an output drive circuit, and an independent channel protection circuit. Its front panel has 32 switch quantity input terminals and 32 switch quantity output terminals, supporting passive / active contact access, and each channel can have an independent status indicator light.

[0067] It should be noted that analog quantity test units and digital quantity test units can also integrate analog and digital quantity test signals. By using an integrated analog and digital quantity unit built into the test equipment or an external integrated analog and digital quantity device, the input and output of analog and digital quantities and automatic switching can be realized.

[0068] In one exemplary embodiment, such as Figure 4 As shown, the test equipment also includes a human-computer interaction unit 140. The front panel of the human-computer interaction unit is equipped with a touch screen 141 connected to the main control computing unit, physical function buttons 142, status indicator lights 143 and a speaker 144.

[0069] Preferably, the human-machine interface unit may include a 10.1-inch high-definition touch screen display, physical function buttons, status indicator lights, a speaker, a touch screen control circuit, and a display driver circuit. The touch screen display is connected to the main control computing unit 110 via an HDMI interface, has a resolution of ≥1920×1200, supports 10-point touch, and is used to receive and display data. Users can edit test templates on the touch screen display, set test parameters and operating condition switching conditions in test cases, and use a visual programming interface to allow users to drag and drop components to define complex test processes (e.g., applying load → switching operating conditions → injecting fault → verifying actions → recovering). Simultaneously, the main control computing unit 110 can call up calculation tools, displaying the calculation interface on the touch screen. Users can input test-related setpoints on the calculation interface, which displays the test values ​​calculated by the calculation tool, enabling accurate testing of the generator-transformer unit protection device.

[0070] The touch screen and physical function buttons are connected to the main control computing unit 110 via a USB 3.0 interface for transmitting user operation commands; the status indicator lights, including power indicator lights, running indicator lights, and alarm indicator lights, are connected to the main control computing unit 110 via a GPIO interface for receiving status control signals; the front panel of its human-machine interaction unit may also be equipped with a speaker outlet.

[0071] Therefore, the human-computer interaction unit can support offline test configuration, real-time waveform display during the test process, online preview of test reports, and audible and visual alarm prompts for abnormalities, enabling full-process interaction of test configuration, status monitoring, result display, alarm prompts, and report preview.

[0072] In one exemplary embodiment, the test equipment further includes: a synchronization time unit connected to the main control computing unit, the synchronization time unit being configured to output a standard timestamp via the BeiDou Navigation Satellite System and the Global Positioning System.

[0073] Optionally, the synchronization unit can internally carry a dual-mode time synchronization module supporting both BeiDou Navigation Satellite System (BDS) and Global Positioning System (GPS), and a PTP (Precision Time Protocol) clock module equipped with an IEEE 1588-2008 time synchronization chip; its front panel can bring out a BDS / GPS time synchronization antenna interface; the synchronization unit is connected to the main control computing unit 110 via a gigabit internal bus, and can be connected to the UART (Universal Asynchronous Receiver / Transmitter) interface of the main control computing unit to output standard timestamps and time synchronization signals, supporting the output of optical PPS (Pulse Per Second), electrical PPS, optical B code (IRIG-B code, a time exchange code), electrical B code, and other time synchronization signals. Therefore, the synchronization unit supports BeiDou / GPS dual-mode time synchronization with a time synchronization accuracy ≤1μs; it supports the PTP IEEE 1588-2008 V2 protocol, enabling it to simulate the time synchronization function of the generator-transformer protection device and achieve synchronous time synchronization of multiple devices.

[0074] In one exemplary embodiment, the test equipment further includes: an optical fiber communication unit connected to the main control computing unit, used for sending and receiving messages in the test process of the transformer group protection device.

[0075] Optionally, the fiber optic communication unit may include multiple SFP (Small Form-factor Pluggable) fiber optic interfaces, optical communication driver circuits, and photoelectric conversion modules. The fiber optic interfaces are connected to the gigabit internal switching chip of the main control computing unit to realize the transmission and reception of SMV (Sampled Measured Values, also known as SV messages), GOOSE (Generic Object Oriented Substation Event), and MMS (Manufacturing Message Specification) messages. It is compatible with mainstream intelligent substation generator-transformer group protection devices and realizes message transmission and reception and digital communication during the testing process of generator-transformer group protection devices.

[0076] Preferably, the SFP fiber optic interface in the fiber optic communication unit can be a 4-channel interface with 8 pairs of LC (Lucent Connector) fiber optic Ethernet interfaces, supporting 100M / 1000M auto-negotiation. It can be arbitrarily configured as a 9-1 / 9-2 SMV message transmitter / receiver or a GOOSE message transmitter / receiver, and has 8 FT3 fiber optic interfaces (6 transmit, 2 receive), supporting 24 independent SMV channel mappings. The fiber optic communication unit can be connected to the main control computing unit 110 via a gigabit internal bus, and can support the simultaneous transmission and reception of multiple SMV and GOOSE messages conforming to IEC61850-9-1, IEC61850-9-2, and IEC60044-7 / 8 (FT3) specifications. It supports MMS and 103 communication protocols, and can perform closed-loop communication with the generator-transformer group protection device via an Ethernet port, automatically updating test parameters, enabling / disabling pressure plates, modifying control words, and obtaining action reports.

[0077] It should be noted that, depending on the actual application requirements, the synchronization time unit and the fiber optic communication unit can be integrated into an integrated structural unit or component with both synchronization time function and fiber optic communication function.

[0078] In one exemplary embodiment, the test equipment further includes a power management unit, comprising multiple isolated DC power supplies, the power management unit being configured to independently power the main control computing unit, the analog quantity test unit, and the switch quantity test unit through each isolated DC power supply.

[0079] For example, the power management unit may include a wide-range AC input power module, a multi-channel isolated DC-DC converter voltage regulator module, an EMI filter circuit (also known as an electromagnetic interference filter or power noise filter), an overcurrent / overvoltage / overtemperature protection circuit, and a power status acquisition ADC (digital-to-analog converter). The input side of the power management unit can be connected to external AC power via a power socket located on the rear of the test equipment's chassis. The output side of the power management unit can be powered independently by multiple isolated DC power supplies to the main control computing unit 110, the analog quantity testing unit 120, the switch quantity testing unit 130, the synchronization and fiber optic communication unit, and the human-machine interface unit. The rear panel of the power management unit can provide an AC 220V power input socket, a grounding terminal, and a main power switch. The entire unit is powered by AC 220±20% V, with a power consumption of <2000VA. All power supply circuits are electrically isolated and have automatic output cut-off protection functions for short circuits and overheating.

[0080] The power management unit can be connected to the main control computing unit 110 via the I2C bus (Inter-Integrated Circuit) so that the main control computing unit 110 can obtain the power supply operating status and upload voltage, current and temperature alarm signals in real time. It can also be connected to the power supply terminals of the analog quantity testing unit 120, the switch quantity testing unit 130, the synchronization time unit, the fiber optic communication unit, and the human-machine interaction unit via the output terminal of the isolated DC power supply.

[0081] Therefore, the power management unit, as the central hub for the power supply of the entire machine, can achieve input power filtering, voltage regulation, branch isolation power supply, automatic fault protection, and real-time monitoring of operating status.

[0082] In one exemplary embodiment, such as Figure 5 The schematic diagram of the test equipment shown shows that the test equipment 10 also includes a portable case 151 and a handle 152. The two ends of the handle 152 are rotatably connected to the fixed parts arranged on both sides of the portable case 151 through rotating parts.

[0083] The testing equipment can adopt a 3U standard chassis structure. Fixing parts can be installed on the symmetrical side walls of the portable housing 151. These fixing parts can be rotatably connected to the rotating parts at both ends of the handle 152 via rotating connectors (such as hinges). Thus, the testing equipment can be portable via the handle. It features a lightweight, portable, integrated, safe, and reliable design, meeting the needs of both indoor and outdoor applications for testing generator-transformer protection devices.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A testing device for the protection device of the generator-transformer unit in a pumped storage power station, characterized in that, The testing equipment includes: a main control computing unit, an analog quantity testing unit, and a digital quantity testing unit. The analog quantity testing unit and the digital quantity testing unit are both connected to the main control computing unit. The analog quantity testing unit is connected to the generator-transformer group protection device through a first test interface, and the digital quantity testing unit is connected to the generator-transformer group protection device through a second test interface. The main control computing unit stores a test template library, and the main control computing unit is configured as follows: Based on the test template library, determine the test cases for the generator-transformer group protection device; According to the test case, the switch quantity test unit is controlled to inject the first switch quantity configured in the test case into the generator-transformer group protection device, and to collect the second switch quantity output by the generator-transformer group protection device in response to the first switch quantity. According to the test case, the analog quantity test unit is controlled to inject the first analog quantity configured in the test case into the generator-transformer group protection device, and to collect the second analog quantity output by the generator-transformer group protection device in response to the first analog quantity. Based on the second switch quantity and the second analog quantity, test analysis results are generated.

2. The testing equipment according to claim 1, characterized in that, The analog quantity testing unit includes an analog signal switching device and an analog signal transmitting device connected to the main control computing unit, wherein: The control terminal of the analog signal switching device is connected to the main control computing unit, and the analog signal switching device is connected in series between the analog signal transmitting device and the first test interface to conduct or disconnect the signal channel between the analog signal transmitting device and the first test interface, so as to control the generator-transformer protection device to switch the unit operating conditions of the pumped storage power station.

3. The testing equipment according to claim 2, characterized in that, The analog signal transmitting device has multiple signal channels with the first test interface, and the analog signal switching device includes a relay matrix, with each relay in the relay matrix connected in series in one of the corresponding signal channels.

4. The testing equipment according to claim 3, characterized in that, The multi-channel signal system includes 6 signal input channels and 18 signal output channels.

5. The testing equipment according to claim 1, characterized in that, The switch quantity test unit includes an input channel connected to the second test interface via an opto-isolation circuit, and an output channel connected to the second test interface via a relay drive circuit; The input channel is connected to the main control computing unit through the opto-isolation circuit and is configured to transmit the acquired second switch quantity to the main control computing unit. The output channel is connected to the main control computing unit through the relay driving circuit and is configured to receive control commands from the main control computing unit and output the first switching quantity corresponding to the control commands.

6. The testing equipment according to claim 1, characterized in that, The switch quantity test unit includes an event sequence recording circuit connected to the external interrupt interface of the main control computing unit. The event sequence recording circuit is configured to record microsecond-level event timestamps.

7. The testing equipment according to claim 1, characterized in that, The testing equipment also includes a human-computer interaction unit. The front panel of the human-computer interaction unit is equipped with a touch screen, physical function buttons, status indicator lights and a speaker that are connected to the main control computing unit.

8. The testing equipment according to claim 1, characterized in that, The testing equipment also includes a portable case and a handle. The two ends of the handle are rotatably connected to fixed parts disposed on opposite sides of the portable case via rotating parts.

9. The testing equipment according to claim 1, characterized in that, The testing equipment also includes: The synchronization time unit is connected to the main control computing unit and is configured to output a standard timestamp through the BeiDou Navigation Satellite System and the Global Positioning System.

10. The testing equipment according to claim 1, characterized in that, The testing equipment also includes: The power management unit includes multiple isolated DC power supplies, and the power management unit is configured to independently power the main control computing unit, the analog quantity testing unit and the switch quantity testing unit through each of the isolated DC power supplies.

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