The RTS GATE-3 testing is an expanded option to our GATE-2 testing. This expanded testing includes additional Doble, Bump, and ELCID testing. The following testing will be performed during an GATE-3 generator test. This is included in a base bid:

Inspections/ Tests performed

  • Borescope inspection of stator winding, rotor winding and blocking (as accessible), stator core step laminations and fingerplates
  • Insulation resistance of RTD’s, stator winding, and rotor winding
  • Stator Winding Test – Polarization Index (PI), Resistance, DC step voltage test. ELCID, Wedge map
  • Rotor Winding Test – Polarization Index, Resistance, AC Impedance, RSO
  • Doble, Bump, and ELCID testing

Exciter inspection

  • Visual inspection
  • Insulation resistance tests

Final Report

  • Standardized format provided electronically (cd or electronic mail)
  • Photographs of critical areas in the stator winding, core, and rotor.
  • Dielectric absorption graph and analysis of insulation integrity
  • Summary of all insulation and winding resistance measurements taken.
  • Any anomalies reported immediately with the Final Report submitted within 10 days of inspection


  • Reveals pending faults in winding of the rotor and stator.
  • Reveals deterioration of coil insulation caused by corona or end winding.
  • Reveals possible shorted core laminations
  • Reveals loose slot support system
  • Establishes a “base line” for evaluating future inspections and input for establishing planned major maintenance activities
    • Option – Electrical Isolation
    • RTS can also provide an estimate for the neutral and main leads disconnection prior to electrical testing and reconnect upon completion of testing.