PD APPLICATIONS - ROTATING MACHINES

Online Monitoring

The installation of our partial discharge (PD) monitoring system requires the motor or generator to be taken off-line. Depending on the size and number of generator poles, we recommend three to 12 couplers for each unit.

Online Monitoring

 

Three PD couplers installed on a motor
Twelve PD couplers on a hydro generator

The coupler terminal box can be placed nearby or directly within the monitoring cabinet, if it can be mounted on a wall in close distance to the generator or motor. One coaxial signal cable for each coupler carries the high frequency PD signal and the superimposed AC signal for synchronisation purposes. The signal will be split internally by the acquisition system. 

The ICMmonitor can be equipped with a multiplexer input for 4, 8, or 12 channels. A separate gating input supports external noise pulse discrimination by using an independent signal provided from a noise antenna or the high frequency current transformer CT100, which picks up pulses such as those produced by grounding leads.

General connection diagram for a PD monitoring system

Typical Package:

Complete PD monitoring system for motors or generators:

  • 1 x ICMmonitor (incl. gating option)
  • 1 x ICMmonitor software
  • 1 x Industrial monitoring cabinet
         (sheet metal or stainless steel)
  • 1 x Analog input card for parallel recording
         of misc. sensor signals like temperatures,
         vibrations, load conditions, etc.
  • 1 x Preamplifier RPA2
  • 1 x Preamplifier RPA1H
  • 1 x High frequency current transformer CT1
  • 1 x Impulse calibrator CAL1B
  • 1 x Set of cables
  • 1 x Set of three coupling capacitors,
         e.g. CC20B, CC14B
  • 1 x Mounting kit for PD couplers
  • 1 x Industrial PC for remote data recording