The 2293 is an automatic winding analyser, optimized for three phase power and distribution transformer measurements.

It uniquely combines winding resistance measurement, turns ratio, dynamic resistance measurement, core demagnetization, transformer type detection, magnetic balance, short circuit impedance and heat run test (temperature rise and cooling curve) in the fastest, single instrument solution in the market.

A simple “one-time-connection” system drastically reduces measuring time: once connected all tests can be performed in a row without any reconnection.

The built-in, simultaneous winding magnetization method guarantees fast and reliable resistance measurements. Stable measurements are reached even on large power transformers with delta windings on the low voltage side. A progressive method for measuring transformer turns ratio, guarantees results closer to the nominal ratio even in large power transformers with tertiary windings.

Dynamic resistance measurement on tap changer, performs an efficient and reliable check of the transformer tap changer.

The demagnetization function eliminates the magnetic remanence, which can cause faulty measurements, high inrush
currents and incorrect operation of protective relays.

Short circuit impedance test, at reduced current, helps to locate mechanical damages. In addition, the magnetic balance test can detect faults in the transformer magnetic core.

Personnel safety is guaranteed by an emergency button, as well as a state-of-the-art active discharge circuit, and a caution indicator that continues to operate even without line power.

An optional interlock connector can be ordered.

ADVANTAGES

One device for transformer winding resistance, turns ratio, arbitrary phase, vector group check, demagnetization, dynamic resistance, short circuit impedance, magnetic balance and heat run test (heat rise and cooling curve).

• • Once connected, can perform all tests in all phases on both windings.
  • More compact and lightweight solution in comparison to traditional equipment with up to 100A test current.
  • Easy operation.
  • Fully automated twinding resistance and tap changer test.
  • Measurement also on non-regular phase displacements (arbitrary phase shifted transformers).
  • Transformer is returned to a demagnetized status after winding resistance measurement or before putting the transformer into service.
  • Magnetic core fault detection.
  • Mechanical damage detection.

  APPLICATIONS
  
  The 2293 is a valuable tool for factory test, acceptance test and regular maintenance on:

  • • Power and distribution transformers
    • All types of HV windings