Testing device based on large power transformer

Abstract

The invention relates to the technical field of transformer testing, in particular to a testing device based on a large power transformer, which comprises a reactor, a voltage divider, a frequency conversion source and an excitation transformer, the frequency conversion source is provided with a power connection port, a signal port and a power output port, and the excitation transformer is provided with a power connection end and a power output end. The input end of the electric reactor is connected with the power output end of the excitation transformer through a cable, the electric reactor is provided with a high-voltage output end and a low-voltage output end, and the high-voltage output end of the electric reactor is connected with intervention equipment through a high-voltage line. The device can simulate the operation states of the power transformer under different working conditions, thereby achieving the comprehensive testing of the performance of the transformer, intervention of the configuration of equipment, such as an isolation switch, a circuit breaker, a lightning arrester, a current and voltage transformer and an insulator, guaranteeing the safety and reliability of the testing process, and effectively preventing the potential risk in the testing process.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer testing, and particularly to a testing device based on a large power transformer. Background Art

[0002] With the continuous expansion of the scale of the power system and the continuous improvement of technical level, large power transformers play a crucial role in the safe and stable operation of the power system. However, traditional testing methods are difficult to meet the requirements of modern power systems for efficient, accurate, and intelligent testing. The following is a detailed summary of the current technical background and limitations:

[0003] Large power transformers are key power transmission and distribution equipment in the power system, and their performance is directly related to the overall stability and safety of the power system.

[0004] With the development of the power system, the testing requirements for transformers are also getting higher and higher, and more accurate and efficient testing methods are needed to ensure the reliable operation of transformers.

[0005] Limitations of the existing technology:

[0006] Low efficiency: Traditional testing methods rely on a large amount of manual operations, and the whole process from test preparation to data analysis takes a long time, which is difficult to meet the requirements of modern power systems for rapid response.

[0007] Insufficient accuracy: Manual measurement and recording of data are prone to introducing human errors, which affects the accuracy of test results and cannot provide a reliable basis for the maintenance and overhaul of transformers.

[0008] Poor safety: Existing testing equipment operates in a high-voltage environment, with great potential safety hazards. At the same time, the protection measures are not perfect enough, and once an accident occurs, the consequences will be unimaginable.

[0009] Low degree of automation: Most testing processes still need to be manually controlled, and a fully automated testing process has not been realized. This not only increases the workload of testing personnel but also limits the improvement of testing efficiency. Summary of the Invention

[0010] (1) Technical problems to be solved

[0011] In view of the deficiencies of the existing technology, the present invention provides a testing device based on a large power transformer.

[0012] (2) Technical solutions

[0013] To achieve the above object, the present invention provides the following technical solutions: A test device based on a large power transformer of the present invention includes a reactor, a voltage divider, a frequency converter power source, and an excitation transformer. The frequency converter power source is provided with a power connection port, a signal port, and a power output port. The excitation transformer is provided with a power connection end and a power output end. The input end of the reactor is connected to the power output end of the excitation transformer through a cable. The reactor is provided with a high-voltage output end and a low-voltage output end. The high-voltage output end of the reactor is connected to an intervening device through a high-voltage wire. The low-voltage output end of the reactor is connected to the voltage divider through a cable. The voltage divider is connected to the frequency converter power source through a signal wire. The intervening device includes a disconnecting switch, a circuit breaker, a lightning arrester, current and voltage transformers, and insulators. The high-voltage wire is electrically connected to the disconnecting switch. The disconnecting switch is electrically connected to the circuit breaker. The circuit breaker is electrically connected to the lightning arrester and the current and voltage transformers. The insulator is electrically connected to the current and voltage transformers, and the insulator is used to connect the wiring terminal of the transformer.

[0014] Preferably, at least three groups of the circuit breaker, the lightning arrester, the current and voltage transformers, and the insulators are provided, and all are connected to the disconnecting switch.

[0015] Further preferably, it further includes a test platform. The test platform is configured with a main control board. The main control board is equipped with a high-performance embedded processor. The test platform is provided with a voltage detector, a current detector, and a temperature sensor. The test platform is provided with a data transmission port, a current interface, and a voltage interface. The data interface and the temperature sensor are electrically connected to the main control board. The current interface is electrically connected to the current detector. The voltage interface is electrically connected to the voltage detector.

[0016] Again preferably, the test platform is provided with a display screen, adjustment buttons, and a power supply module, and the display screen, the adjustment buttons, and the power supply module are all electrically connected to the main control board.

[0017] Preferably, the main control board is configured with a wireless communication module, and the wireless communication module is used for remote data transmission and control command sending.

[0018] Further preferably, the main control board is configured with an AI intelligent model. The AI intelligent model receives data from various sensors, including current, voltage, and temperature parameters, and conducts multi-dimensional analysis. The AI intelligent model provides constructive maintenance suggestions based on the analysis results.

[0019] Again preferably, the AI intelligent model trains historical data through machine learning algorithms, identifies potential fault modes, and provides fault warning and diagnosis functions.

[0020] Preferably, the AI intelligent model has a real-time data analysis function, which is used to deeply mine the collected data, generate professional test reports, and support data visualization display. The data visualization display includes graphical interfaces, dynamic charts, heat maps, fault warning indicators, historical data comparison, multi-dimensional analysis, and customized report generation.

[0021] Further preferably, the power supply module includes a large-capacity lithium-ion battery pack and an efficient charging circuit, and the wireless communication module supports Wi-Fi, Bluetooth, and cellular network communication protocols.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides a test device based on a large power transformer, which has the following beneficial effects:

[0024] Comprehensive performance test:

[0025] By integrating key components such as reactors, voltage dividers, frequency converters, and excitation transformers, the device can simulate the operating states of power transformers under different working conditions, thereby realizing a comprehensive test of the transformer performance.

[0026] The configuration of intervening devices, such as disconnectors, circuit breakers, lightning arresters, current and voltage transformers, and insulators, ensures the safety and reliability of the test process and effectively prevents potential risks during the test.

[0027] Efficient data acquisition and processing:

[0028] The application of a high-performance embedded processor greatly improves the speed of data acquisition, processing, and analysis, thereby improving the test efficiency.

[0029] The introduction of the AI intelligent model realizes the deep mining and rapid response of real-time data, providing strong support for fault warning and diagnosis.

[0030] Safe and reliable test environment:

[0031] The use of disconnectors and circuit breakers can quickly cut off the circuit during maintenance or repair to avoid electrical accidents.

[0032] Remote monitoring and data transmission:

[0033] Supported by the wireless communication module, remote data transmission and control command sending are realized, facilitating users to perform remote monitoring and operation.

[0034] The seamless connection with the cloud service platform enables test data to be uploaded, stored, and analyzed in real time, improving the convenience and security of data management.

[0035] Intelligent analysis and warning:

[0036] The application of the AI intelligent model realizes the in-depth analysis of multi-dimensional data, can identify potential fault modes and provide fault warning and diagnosis functions.

[0037] The realization of the real-time data analysis function enables users to timely understand the working state of the transformer and provides decision-making support for maintenance and overhaul.

[0038] Professional test report generation:

[0039] After the test, the system automatically generates an electronic report containing all test data and charts, which is convenient for technicians to refer to and archive.

[0040] The report supports data visualization display, including graphical interfaces, dynamic charts, heat maps, etc., making the test results more intuitive and understandable.

[0041] In summary, the test device based on large power transformers has beneficial effects such as comprehensive performance testing, efficient data acquisition and processing, a safe and reliable test environment, a user-friendly interaction interface, remote monitoring and data transmission, intelligent analysis and warning, and professional test report generation. The application of this device will greatly improve the test efficiency and accuracy of power transformers and provide a strong guarantee for the safe and stable operation of the power system. Brief Description of the Drawings

[0042] Figure 1 It is a schematic layout structure diagram of the test device of the present invention;

[0043] Figure 2 It is a schematic layout structure diagram of the intervention device of the present invention;

[0044] Figure 3 It is a schematic layout structure diagram of the test platform of the present invention;

[0045] Figure 4 It is a schematic detailed process structure diagram of the present invention; Detailed Embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] Please refer to Figures 1-4, a test device based on a large power transformer of the present invention includes a reactor, a voltage divider, a frequency converter, and an excitation transformer. The frequency converter is provided with a power connection port, a signal port, and a power output port. The excitation transformer is provided with a power connection terminal and a power output terminal. The input end of the reactor is connected to the power output terminal of the excitation transformer through a cable. The reactor is provided with a high-voltage output terminal and a low-voltage output terminal. The high-voltage output terminal of the reactor is connected to an intervening device through a high-voltage wire. The low-voltage output terminal of the reactor is connected to the voltage divider through a cable. The voltage divider is connected to the frequency converter through a signal wire. The intervening device includes a disconnector, a circuit breaker, a lightning arrester, current and voltage transformers, and insulators. The high-voltage wire is electrically connected to the disconnector. The disconnector is electrically connected to the circuit breaker. The circuit breaker is electrically connected to the lightning arrester and the current and voltage transformers. The insulator is electrically connected to the current and voltage transformers, and the insulator is used to connect the wiring terminal of the transformer.

[0048] The device for testing the performance of a large power transformer integrates key components such as a reactor, a voltage divider, a frequency converter, and an excitation transformer, and introduces an AI intelligent model for real-time data analysis and fault warning. The device ensures the safety and reliability of the system through a series of intervening devices (such as disconnectors, circuit breakers, lightning arresters, current transformers (CTs), voltage transformers (PTs), and insulators), and at the same time realizes automatic control and remote monitoring by using a high-performance embedded processor and a wireless communication module.

[0049] Connection structure of core components

[0050] Reactor: The input end is connected to the power output terminal of the excitation transformer through a cable, and is provided with a high-voltage output terminal and a low-voltage output terminal.

[0051] The high-voltage output terminal is connected to an intervening device through a high-voltage wire, including a disconnector, a circuit breaker, a lightning arrester, a current transformer (CT), a voltage transformer (PT), and an insulator.

[0052] The low-voltage output terminal is connected to the voltage divider through a cable, and the voltage divider is then connected to the frequency converter through a signal wire.

[0053] Excitation transformer: It is provided with a power connection terminal and a power output terminal, and provides an excitation voltage for the transformer under test.

[0054] Frequency converter: It is provided with a power connection port, a signal port, and a power output port, and is responsible for providing a stable AC power supply and adjusting the frequency to simulate different working conditions.

[0055] Voltage divider: Accurately measures the high-voltage side voltage and outputs a low-voltage signal to the frequency converter through proportional conversion for adjusting the output power characteristics.

[0056] Configuration of intervening devices

[0057] More than three groups of protection devices: There are at least three groups of circuit breakers, lightning arresters, current and voltage transformers, and insulators, all of which are connected to the disconnector to ensure a multiple protection mechanism.

[0058] Disconnector: Used for electrical isolation to cut off the circuit during maintenance or repair.

[0059] Circuit breaker: Provides short-circuit and overload protection.

[0060] Lightning arrester: Protects the system from transient overvoltages.

[0061] Current transformer (CT) and voltage transformer (PT): Used to measure current and voltage.

[0062] Insulator: Supports high-voltage conductors and maintains electrical insulation.

[0063] Test platform and main control board

[0064] Test platform: Configured with a main control board, equipped with a high-performance embedded processor, and integrated with a voltage detector, current detector, and temperature sensor.

[0065] Interface design: Equipped with a data transmission port, current interface, and voltage interface. These interfaces are electrically connected to the main control board. The data transmission port is connected to the frequency converter through a wire. The current interface is used to connect the wire for measuring the transformer current, and the voltage interface is used to connect the wire for measuring the transformer voltage, and then processes the data from each sensor and frequency converter.

[0066] User interface

[0067] Display screen: A high-resolution color touch screen, which is convenient for users to view real-time data and set parameters.

[0068] Adjustment buttons: Used to manually adjust test parameters.

[0069] Power module: Contains a large-capacity lithium-ion battery pack and an efficient charging circuit, ensuring long-term independent power supply ability and having overcharge and over-discharge protection functions.

[0070] Wireless communication and remote control

[0071] Wireless communication module: Supports Wi-Fi, Bluetooth, and cellular network communication protocols, realizes remote data transmission and control command sending, and can be seamlessly connected to the cloud service platform.

[0072] AI intelligent model application

[0073] Multi-dimensional data analysis: The AI intelligent model receives data from each sensor, including current, voltage, and temperature parameters, and conducts in-depth analysis.

[0074] Fault warning and diagnosis: Train historical data through machine learning algorithms, identify potential fault patterns, and provide fault warning and diagnosis functions.

[0075] Real-time data analysis: Process the collected data in real time, generate professional test reports, and support data visualization displays, including graphical interfaces, dynamic charts, heat maps, fault warning indicators, historical data comparison, multi-dimensional analysis, and customized report generation.

[0076] Graphical interface: Provide an intuitive graphical user interface (GUI) where users can view test results through a touch screen or remote terminal;

[0077] Dynamic charts: Support various types of dynamic charts, such as line charts, bar charts, pie charts, etc., to clearly display the changing trends of parameters such as current, voltage, and temperature;

[0078] Heat map: Use a heat map to display the load distribution within different time periods to help identify abnormal hot spots;

[0079] Fault warning indicator: Mark potential fault points on the interface with prominent colors or icons to issue an alarm in advance;

[0080] Historical data comparison: Allow users to select historical data for a specific time period for comparative analysis to help discover long-term changing trends;

[0081] Multi-dimensional analysis: Support data analysis in multiple dimensions such as time, location, and device type to provide a more comprehensive perspective;

[0082] Customized report generation: Users can customize different report templates according to their needs and generate professional test reports containing key indicators with one click.

[0083] Detailed process

[0084] Preparation work

[0085] Transport the test device to the designated location.

[0086] Securely connect the transformer terminal to the measurement platform and the insulator.

[0087] Initialization phase

[0088] Turn on the power switch and enter the initialization phase. The main control board self-checks the working status of each subsystem. After ensuring everything is normal, it prompts the user to input necessary test parameters.

[0089] Start the test

[0090] The user selects the required test items on the touch screen interface of the LCD display and presses the confirmation key to start the official test.

[0091] The frequency conversion source provides appropriate AC power according to the set parameters, and the excitation converter applies excitation voltage to the transformer, putting the transformer into working state.

[0092] The reactor adjusts the input current waveform, and the voltage divider measures the high-voltage side voltage and converts the signal into a low-voltage output.

[0093] Data collection and processing

[0094] The measurement platform is activated in sequence according to the preset program, collects the corresponding electrical parameters and the original data of the frequency conversion source, and sends the original data to the main control board for processing.

[0095] The main control board calculates and verifies the received data to form the final test result.

[0096] AI Intelligent Analysis

[0097] The AI ​​intelligent model conducts in-depth mining of the collected data, identifies abnormal patterns and issues alarms in advance to prevent faults from escalating.

[0098] Provide constructive maintenance suggestions based on the analysis results, such as replacing aging parts or adjusting operating parameters to extend the service life of the equipment.

[0099] Generate Report

[0100] After the test is completed, the system automatically generates an electronic report containing all test data and charts for technicians' reference and archiving.

[0101] If any abnormal situation is detected, the device will immediately issue an alarm to notify relevant personnel to take measures to avoid the expansion of potential risks.

[0102] Remote monitoring and management

[0103] By uploading data to the cloud server for storage through the wireless communication module, users can remotely access the data visualization platform through the Internet and share the analysis results with other authorized users or team members.

[0104] In order to further determine the specific configuration parameters and models of reactors, excitation transformers, frequency converters, voltage dividers, intervention equipment and main control boards in a test device based on large power transformers, the following are detailed recommendations. These recommendations are based on common high-performance products and technical standards on the market to ensure the reliability, accuracy and advancement of the system.

[0105] Reactor parameters:

[0106] Rated voltage: Select according to the rated voltage of the transformer being tested (such as 6kV, 10kV)

[0107] Rated current: Select according to the maximum expected load current

[0108] Power factor: > 0.95

[0109] Cooling method: Natural cooling or forced air cooling

[0110] Insulation class: Class H

[0111] Excitation transformer parameters:

[0112] Rated capacity: Selected according to the requirements of the transformer under test (such as 500 kVA, 1000 kVA)

[0113] Input voltage: 380V / 400V three-phase AC

[0114] Output voltage: Adjusted according to the requirements of the transformer under test (such as 10 kV, 35 kV)

[0115] Efficiency: ≥ 98%

[0116] Cooling method: Oil-immersed self-cooling or forced oil circulation

[0117] Frequency converter source parameters:

[0118] Input voltage: 380V / 400V three-phase AC

[0119] Output frequency range: 0 - 500 Hz adjustable Output power: Selected according to the test requirements (such as 50 kW, 100 kW)

[0120] Control accuracy: ±0.1% F.S.

[0121] Protection functions: Overcurrent, overvoltage, undervoltage, short-circuit protection

[0122] Voltage divider parameters:

[0123] Voltage division ratio: Select a suitable voltage division ratio according to the high-voltage side voltage (such as 1000:1) Measurement accuracy: ≤ 0.1%

[0124] Insulation resistance: > 100 GΩ

[0125] Operating temperature range: -20°C to +70°C

[0126] Safety level: Complies with IEC61010 standard

[0127] Disconnecting switch for intervening equipment: Rated voltage: Selected according to the system voltage (such as 12 kV, 24 kV) Rated current: Selected according to the maximum expected load current

[0128] Operating mode: Manual or electric operation Circuit breaker: Rated voltage: Selected according to the system voltage (such as 12 kV, 24 kV) Rated current: Selected according to the maximum expected load current

[0129] Short-circuit breaking capacity: ≥63 kA

[0130] Protection characteristics: Instantaneous tripping, short-time delay tripping, long-time delay tripping Surge arrester: Rated voltage: Selected according to system voltage (such as 12 kV, 24 kV) Maximum continuous operating voltage: Selected according to actual application Residual voltage level: <1.5 times the peak value of the system's highest operating line voltage

[0131] Response time: <1 μs

[0132] Current transformer (CT): Rated primary current: Selected according to actual application (such as 100 A, 400 A)

[0133] Rated secondary current: 5 A or 1 A

[0134] Accuracy class: 0.2 or higher

[0135] Insulation level: Complies with relevant national standards

[0136] Voltage transformer (PT): Rated primary voltage: Selected according to actual application (such as 10 kV, 35 kV)

[0137] Rated secondary voltage: 100 V

[0138] Accuracy class: 0.2 or higher

[0139] Insulation level: Complies with relevant national standards

[0140] Insulator: Rated voltage: Selected according to system voltage (such as 12 kV, 24 kV)

[0141] Insulating material: Silicone rubber or other high-performance composite materials

[0142] Mechanical strength: Meets the requirements of corresponding standards

[0143] Main control board parameters:

[0144] CPU: Hexa-core Cortex-A72 (6 cores) + Quad-core Cortex-A57 (4 cores)

[0145] GPU: Volta architecture, with 384 CUDA cores

[0146] Memory: 8 GB LPDDR4x

[0147] Storage: 16 GB eMMC

[0148] Interfaces: USB 3.1, Gigabit Ethernet, MIPI CSI-2 camera interface, PCIe Gen3 x4

[0149] Operating System Support: Linux for Tegra

[0150] AI Computing Performance: Up to 21 TOPS.

[0151] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test device based on a large power transformer, characterized in that: It includes a reactor, a voltage divider, a frequency conversion source and an excitation transformer. The frequency conversion source is provided with a power connection port, a signal port and a power output port. The excitation transformer is provided with a power connection terminal and a power output terminal. The input terminal of the reactor is connected to the power output terminal of the excitation transformer through a cable. The reactor is provided with a high-voltage output terminal and a low-voltage output terminal. The high-voltage output terminal of the reactor is connected to an intervention device through a high-voltage line. The low-voltage output terminal of the reactor is connected to the voltage divider through a cable. The voltage divider is intervened in the frequency conversion source through a signal line. The intervention device includes an isolating switch, a circuit breaker, a lightning arrester, a current and voltage transformer and an insulator. The high-voltage line is connected to the isolating switch circuit, the isolating switch is connected to the circuit breaker circuit, the circuit breaker is electrically connected to the lightning arrester and the current and voltage transformer, the insulator is electrically connected to the current and voltage transformer, and the insulator is used to connect the wiring terminal of the transformer.

2. A test device based on a large power transformer according to claim 1, characterized in that: The circuit breaker, lightning arrester, current and voltage transformer and insulator are provided in at least three groups, and all of them are connected to the isolating switch.

3. A test device based on a large power transformer according to claim 2, characterized in that: It also includes a test platform, on which a main control board is configured, the main control board is equipped with a high-performance embedded processor, a voltage detector, a current detector and a temperature sensor are provided on the test platform, a data transmission port, a current interface and a voltage interface are provided on the test platform, the data interface and the temperature sensor are electrically connected to the main control board, the current interface is electrically connected to the current detector, and the voltage interface is electrically connected to the voltage detector.

4. A test device based on a large power transformer according to claim 3, characterized in that: The test platform is provided with a display screen, an adjustment button and a power module, and the display screen, the adjustment button and the power module are all electrically connected to the main control board.

5. A testing device based on a large power transformer according to claim 4, characterized in that: The main control board is equipped with a wireless communication module, which is used for remote data transmission and control command sending.

6. A test device based on a large power transformer according to claim 5, characterized in that: The main control board is configured with an AI intelligent model, which receives data from various sensors, including current, voltage, and temperature parameters, and performs multi-dimensional analysis. The AI ​​intelligent model provides constructive maintenance suggestions based on the analysis results.

7. A testing device based on a large power transformer according to claim 6, characterized in that: The AI ​​intelligent model trains historical data through machine learning algorithms, identifies potential failure modes, and provides fault warning and diagnosis functions.

8. A testing device based on a large power transformer according to claim 7, characterized in that: The AI ​​intelligent model has real-time data analysis capabilities, which is used to conduct in-depth mining of collected data, generate professional test reports, and support data visualization. The data visualization includes graphical interfaces, dynamic charts, heat maps, fault warning indicators, historical data comparisons, multi-dimensional analysis, and custom report generation.

9. A testing device based on a large power transformer according to claim 8, characterized in that: The power module includes a large-capacity lithium-ion battery pack and an efficient charging circuit, and the wireless communication module supports Wi-Fi, Bluetooth and cellular network communication protocols.

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