Transformer Comprehensive Test Bench Test Type
The transformer comprehensive test bench is a professional equipment that integrates multiple test functions and is suitable for the performance evaluation of power transformers and distribution transformers. The equipment not only supports no-load and load characteristic tests, but also can perform double-frequency induction withstand voltage tests and power frequency withstand voltage tests. It is widely used in transformer manufacturing, installation and commissioning, and operation and maintenance.
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Equipment features
1. Efficient and friendly operation interface
Equipped with a 320×240 high-brightness LCD screen with adjustable screen brightness to adapt to different ambient light. Supports full Chinese menus and operation prompts to simplify the use process and allow users to quickly get started.
2. Flexible parameter management
Up to 40 sets of test parameters can be pre-stored, which is convenient for users to quickly switch according to test requirements. Supports deletion and addition of parameters to achieve flexible experimental management.
3.Accurate measurement capability
It can accurately measure core parameters such as no-load current, no-load loss, short-circuit voltage, etc., providing a reliable basis for transformer performance analysis.
4.Safety design and reliability
Equipped with an emergency stop button and a multi-level protection mechanism to ensure safe operation.Wide temperature adaptability and high reliability design enable the equipment to operate stably in different seasons and complex environments.
Core test functions and detailed operations
1. No-load test
The no-load test is used to evaluate the electrical characteristics of the transformer under no-load conditions, such as no-load current and no-load loss, which mainly reflects the quality of the core material and design.
Operation steps:
1. Connect the main console of the test bench to the auxiliary console through the aviation plug line.
2. Ensure that the "three-phase four-wire" of the test bench is correctly connected to the main power supply.
3. Connect the "voltage regulator input" and "voltage regulator output" terminals to the voltage regulator, and connect the low-voltage side of the transformer at the same time.
4. Close the air switch, turn on the control power lock switch, and start the power supply of the no-load tester. The instrument interface displays the initialization status.
5. Set the test parameters, including the target voltage and current gear (operate according to the manual of the no-load tester).
6. Press the "three-phase closing" button to start closing and observe whether the three-phase closing indicator light is on.
7. Press the boost button to slowly increase the voltage to the target value while observing the voltage meter and ammeter readings.
8. After reaching the target value, record the test data, which can be directly printed or saved through the instrument.
9. Press the "three-phase opening" button, and the device automatically reduces the voltage to zero to complete the test.
2. Load test
The load test simulates the working conditions of the transformer under load, measures the short-circuit voltage and load loss, and provides important data for operating efficiency analysis.
Operation steps
1. Similar to the no-load test, but connect the high-voltage side of the transformer to the test bench and short-circuit the low-voltage side.
2. Follow the steps of the no-load test to complete power supply access, equipment initialization and parameter setting.
3. Increase the voltage until the load current reaches the target value, and record the current, voltage and loss data.
4. During the test, if any abnormal phenomenon occurs, press the emergency stop button immediately, the equipment automatically reduces the voltage and terminates the test.
5. After the test, print the test report through the instrument.
3. High-voltage characteristic test
The high-voltage characteristic test is used to detect the reliability of the transformer insulation system and the change of short-circuit impedance, which is particularly suitable for precision testing needs on site or in factories.
Operation steps:
1. Connect the test bench, intermediate transformer, current transformer and transformer under test to ensure that the line is correct.
2. Set the test parameters, especially the high-voltage range and protection current value.
3. Press the "three-phase closing" button to gradually increase the voltage to the target voltage and closely observe the real-time data displayed by the device.
4. Record the voltage, current and power factor at the end of the test to determine whether the high-voltage performance of the transformer meets the expected standards.
5. Reduce the voltage according to the procedure and end the test after ensuring that the equipment is safely returned to its position.
4. Inductive withstand voltage test
The inductive withstand voltage test uses a double-frequency voltage to test the insulation performance of the transformer and verify its long-term operating reliability under high voltage.
Operation steps:
1. Connect the generator output to the test bench and ensure that the "inductive output" is connected to the transformer under test.
2. Set the time relay and preset the time required for withstand voltage.
3. After starting the generator, slowly increase the voltage to the target value and maintain a stable state.
4. Observe the reading of the withstand voltage output meter. If there is no abnormality, keep the test until the time is over.
5. After the test is completed, the equipment automatically reduces the voltage, and the test data is saved or printed at the end.
5. Power frequency withstand voltage test
The power frequency withstand voltage test is used to comprehensively evaluate the power frequency voltage tolerance of the transformer insulation system, and is often used as an important part of factory testing and routine testing.
Operation steps:
1. Connect the test bench to the transformer under test, including "power frequency output" and instrument connection.
2. Set the withstand voltage time and target voltage parameters, and confirm that safety measures are in place.
3. Press the "power frequency closing" button to gradually increase the voltage to the target value, while observing the withstand voltage meter reading.
4. While maintaining the withstand voltage, pay attention to the alarm indication and equipment status to ensure the safety of the test.
5. After the test is completed, the equipment automatically reduces the voltage, and the test report can be directly generated after completion.
Precautions for use
1. Wiring standardization
Before each test, check in detail whether the wiring is firm, especially the grounding connection. Incorrect wiring may lead to deviation in test results or even damage to the equipment.
2. Emergency handling
If an abnormality is found during the test, the emergency stop button should be quickly pressed to terminate the test, and then restart after the problem is solved.
3. Data storage and backup
Archive and analyze the test data regularly to ensure that important parameters can be used for subsequent maintenance and decision-making reference.
The transformer comprehensive test bench is an important tool in the field of power equipment testing. Its comprehensive functions and high operational flexibility make it a core device in transformer performance evaluation. By optimizing the test process and strengthening the safety performance of the equipment, the test bench provides a solid guarantee for the stable operation of the power system while improving the test efficiency and data reliability.
