(1) Single-phase power input, internally generated three-phase power output, better equivalence, it solved the problem of groups misjudgment caused by the common single-phase power output-type devices.
  (2) Just takes a few seconds to complete three-phase test. It only need input one standard turns ratio when measure multi- gears transformer, all the turns ratio error of tap can be calculated.
  (3) If reverse connection of the high side and the low side, the instrument will automatically cut off the output power and sent an alarm signal; there is a fuse on the high side against output short circuit or overload.
  (4) Do not need to select the transformer wiring, no need to input standards transformation turns ratio, measures Y / △, △ / Y transformer needn’t external shorted , it can automatically test.
  (5) It can upgrades in the field needn’t disassemble through the built-in online JTAG programming interface.