Main Functions




1. Automatically measure the connection group.

2. Automatically change groups, directly measure the turns ratio of single-phase, three-phase transformers and instrument transformers.

3. Automatically switch phase sequence.

4. Automatically switch ranges.

5. Automatically calibrate the meter.

6. After inputting the standard turns ratio, automatically calculate the relative error.

7. After one measurement is completed, automatically cut off the test voltage.

8. Measurement results are automatically saved, test data can be printed, and 20 historical measurement data can be stored.

Main Technical Indicators




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3. Accuracy: 1～1000 0.2 class; 1000～10000 0.5 class



5. Operating ambient temperature: -5℃～40℃

6. Operating ambient humidity: <85%

7. Volume: 430×320×215 mm3

8. Weight: 5kg

Technical Parameters




Turns ratio range: 1～10000 Group range: 1～12

Measurement accuracy: 0.2%

Polarity: Positive polarity Negative polarity

Operation




1. Wiring: Connect the instrument terminals (A, B, C, a, b, c) to the transformer terminals (A, B, C, a, b, c) correspondingly. Be careful not to reverse the high and low voltage connections, otherwise the instrument may be damaged.

2. Turn on the power switch, then it displays self-test 1; self-test 2; self-test 3; passed, indicating the instrument is self-testing. Finally, it displays the turns ratio, tap percentage, group, and the information display bar (error display bar) shows "Self-test passed", indicating the instrument is normal and the next step can be performed.

3. Press the key, input the turns ratio, tap spacing, and group in sequence until the parameter indicator goes out. If the parameters used for this test are the same as the previous time, this operation can be omitted.

4. Use the tap adjustment key to adjust the tap position. Each time this key is pressed, the tap value moves by one tap spacing. If pressing the tap adjustment key has no response on the tap display, it means the tap spacing has not been set. In this case, press the parameter key to set the tap spacing.

5. Measurement

a. Three-phase continuous: Press the key, the key light turns on. Press the key, the key light turns on, the instrument starts measuring and automatically enters the recording state. After each phase is measured, a prompt tone sounds, and it proceeds to the next phase measurement. After all are completed, it stops automatically.

b. Single-phase: Press the key, the key light turns on. Press the key, the key light turns on, the instrument starts measuring. After the error display stabilizes, record the data. Press the key, the key light turns on, completing the AB phase test. Similarly, complete the BC and CA phase measurements.

6. Printing

a. If printing is required, you must press the record key before the measurement operation, the key light turns on, and the instrument enters the automatic recording state, automatically recording the data of each subsequent measurement operation. If the power is cut off, if the three-phase continuous function is used for measurement, the instrument automatically records, and there is no need to press the key before measurement.

b. Press the print key, the screen displays "Printing", and after a moment the screen displays "Print completed" to complete printing. If any key is pressed during printing, the screen displays "Print aborted", and you can exit printing midway. If there is no data in the memory, pressing the print key causes the print key light and record key light to flash simultaneously, and the screen displays "Memory empty", so printing cannot be performed.

C. Of course, if the previous test data does not need to be retained, clear the data before the measurement operation. Press the key. If the memory is already empty, the clear memory key light and record key light flash simultaneously, and the screen displays "Memory already empty". If the memory is not empty, the screen displays "Clear memory?", then press the clear memory key again to clear the memory, or press any other key to abort clearing, and the screen displays "Clear memory aborted". When the memory is full, the and key lights flash as a reminder. Press the key twice consecutively to clear the old data.

7. Use of other function keys

a. key: If you need to observe the actual measured turns ratio during the measurement, press the key before measurement, the key light turns on, indicating that the actual measured turns ratio can be displayed during measurement. Press the key again, the key light turns off, and the actual measured turns ratio will not be displayed during measurement.

b. key: Most transformers have taps on the high voltage side. When testing transformers with taps on the low voltage side, use this key, the key light turns on. Press this key again, the key light turns off. In most cases, this key light should be off.

c. key: If the group of a three-phase transformer is not known in advance, connect the three-phase transformer test leads, press the key, the key light turns on, press the key, the instrument starts working, and it takes about 70 seconds. The group and turns ratio test results will be displayed. The instrument does not analyze the group of single-phase transformers; it is only 0 or 6. If the polarity is wrong, the group display window flashes to indicate an error. Some transformers may have errors when analyzing the group, but can measure normally with input parameters. The reason is that the transformer core lamination symmetry is not good, and when one column is excited, the magnetic distribution error in other columns is large.

d. key: Press the key, the instrument starts self-testing. First, it lights up all displays in sequence for the operator to check, then it checks whether the voltage divider and measurement circuit work normally.

e. Number keys: The number keys are multifunction keys, effective when the key light is on. For example, when the number "0" is pressed while the parameter key light is on, pressing the key inputs 0. When the parameter light is off, pressing the key prints.