Comprehensive Transformer Characteristics Tester
Comprehensive Transformer Characteristics Tester is specifically designed for relay protection professionals to test current transformer volt-ampere characteristics, ratio testing, and polarity discrimination. It can also be used for transformer polarity discrimination tests, making it a cost-effective multifunctional testing instrument.
This instrument uses high-efficiency, low-consumption quality materials and specially wound voltage boosters, with a microcontroller microprocessor for data acquisition, analysis, and storage. It features a built-in micro printer that can print test data and curves. When measuring CT ratio, it can automatically calculate the ratio value. One person can complete all testing tasks. This device is lightweight, easy to operate, and has unique performance, making it an indispensable tool for field personnel.
Instrument Features
1. Single power supply 220VAC, safer and more reliable (completely abandoning the dangerous 380V live wire);
2. Single unit output 2500V/1000A;
3. Can test transformers with ratios 5A/5A—25000A/5A, 5A/1A—5000A/1A;
4. Only need to set test voltage and current, the device automatically completes the test quickly, no training required, easy to master;
5. Large output capacity, full functions, high accuracy, unique performance;
6. 320×240 large LCD display, full Chinese graphical interface;
7. Uses imported rotary mouse, faster and simpler to set test values;
8. Directly displays volt-ampere curves during testing, clear graphics, intuitive and convenient;
9. Built-in fast printer, supports on-site printing of test results;
10. Built-in large-capacity memory, can save 1000 sets of test data, data is not lost after power failure, can be accessed at any time;
11. USB communication interface, convenient for connecting new laptops, can upload test data for editing, saving, or printing;
12. Integrates multiple instrument functions into one, easily achieving one machine with multiple uses, effectively improving work efficiency and reducing labor intensity.
13. Supports offline and online testing
Technical Specifications
1. Input voltage: AC 220V or 380V, 50Hz, automatic identification of input voltage.
2. Working environment temperature: 0~40℃.
3. Input voltage: When input AC 220V, output 0-500V.
When input AC 380V, output 0-1000V.
Current: Maximum instantaneous current, 600A when testing ratio.
When input AC 220V, output 0-400A.
When input AC 380V, output 0-600A.
15A when testing volt-ampere characteristics.
4. Digital voltmeter measurement range: 0-9999V; resolution: 0.1V.
When displaying current: 0-9.9A; resolution: 0.1mA.
5. Digital ammeter measurement range: 0~3000A; resolution: 0.01A.
6. Error: 1≤1%, U≤1%.
7. When testing CT ratio, automatically calculates ratio value and prints data and calculation results.
8. When testing volt-ampere characteristics, stores and prints 20 sets of current and voltage values and volt-ampere characteristic curves.
9. External dimensions: length×width×height=470×340×260mm3.
10. Weight: 23Kg.
Precautions
1. The secondary coil of the current transformer should not have a grounding point.
2. The voltage regulator switch and output switch should be in the off position before connecting or disconnecting wires.
3. The device should be reliably grounded before testing.
4. After testing, return to zero promptly; do not stay under high voltage or high current for extended periods.
◆Common Fault Maintenance
1. LCD shows nothing after turning on the power switch.
Solution: Check if the power input line is properly connected.
2. No voltage or current output during volt-ampere characteristic test.
Solution: Check if the voltage regulator switch (overcurrent protection) is turned on.
3. Voltage but no current during volt-ampere characteristic test.
Solution: Check if the test loop wires are properly connected.
4. No current output during ratio test.
Solution: Check if the primary test wire is properly connected.
5. Voltage regulator switch trips during startup test.
Solution: Check if the transformer grounding point is disconnected.
◆LCD Contrast Adjustment
1. When the LCD display is too dark or too bright, adjust using the potentiometer (terminal 4) on the panel.
◆Replacing Printer Paper
1. First disconnect the power, open the printer panel, pinch both ends of the telescopic paper shaft, remove the paper roll shaft from the printer, slide the new paper roll onto the shaft, pinch the shaft ends, place the shaft back in place, release to let the shaft snap into the shaft holder, and confirm the shaft is securely installed.
2. Cut the end of the new paper roll into a triangular shape with scissors, turn on the power, press the paper feed button for 3 seconds, the print head rotates, then push the paper roll with the cut end into the paper inlet at the bottom of the print head, the printer will pull the paper in, once a section of paper comes out of the paper outlet, turn off the power, then thread the paper end through the paper outlet on the front cover, and close the printer panel.
Instrument Usage Method
Volt-Ampere Characteristic Test
1. The user should appropriately select the input voltage based on the volt-ampere characteristics of the device under test. When output above 500V is needed, input 380V voltage.
2. Ground the instrument reliably.
3. Check that the current transformer has no grounding point.
4. Switch the "16" switch to the volt-ampere position.
5. Connect the instrument output and voltage measurement to the secondary side of the current transformer (as shown in Figure 2).
6. Check that the voltage regulator is at zero, turn on the "24" switch, press the reset button once, the indicator light above it lights up, and the microprocessor is in waiting storage state.
7. Turn on output switch 4, slowly rotate the voltage regulator clockwise, press the storage button when storage is needed, the indicator light above the storage button lights up, and the internal buzzer sounds. (Note: Do not turn back the voltage regulator during the entire measurement process; keep the time at high current as short as possible.)
8. Up to 20 sets of current and voltage values can be stored.
9. After storage, return the voltage regulator to zero.
10. Press the print button to print the test data and volt-ampere characteristic dot matrix. The voltage axis has three ranges, automatically selected based on the maximum sampled voltage:
0—199V each grid represents 10V; 200V—499V each grid represents 25V; 500V—2000V each grid represents 50V. The current axis has two ranges, automatically selected based on the maximum sampled current.
0—7A each grid represents 0.25A; 7A—40A each grid represents 0.5A
11. Press the reset button to reset and repeat the test.
12. After testing, turn off switch "4" and switch "24", and disconnect the connecting wires.
