Before testing: Equipment safety grounding and reliable connection of test lines
During testing: The instrument is designed with a back electromotive force protection function, and the following steps still need to be followed during use to ensure accuracy
Ensure the personal safety of instruments and testing personnel.
A, It is not allowed to remove the test line during the testing process and before the power is fully discharged.
B, It is not allowed to switch the no-load tap changer during the testing process or before the discharge is completed.
C, During the testing process, if there is a sudden power outage of external AC220V, it is necessary to wait for ten minutes before removing the testing line.
For medium and low voltage star windings, three-phase simultaneous testing is not applicable.
D, The stability of the data is determined as the final value after 10-30 seconds of no change in the data, and the data is repeated once
