Page 2 - Guard II+ - Use Data Effectively

ON-LINE MONITORING THE EFFICIENT WAY

The What?

The What … Partial Discharge
… because the PD monitoring system uses VHF and time-of-flight to automatically filter out noise and classify disturbances, then the output of the Guard
monitor is only the PD detected by each sensor. As such, the DCS can be configured to trend (doubling over a twelve-month interval) and when compared
to the Iris database issue alerts, warnings, and notifications. Additionally, the polarity of the PD pulses is tracked individually, so whether the source is
polarity predominant and/or correlates with load or temperature can be determined. This makes it possible to determine the problem coils and if the
problems are likely due to thermal deterioration, coil/bar movement, surface activity or deterioration of the turn insulation.

The What … Flux
… because the flux monitoring system automatically calculates the difference in flux between coils of opposite poles in round rotors and the total flux
for salient pole rotors, then the output of the Guard monitor is only these values. As such, the DCS can be configured to trend these values and to
issue alerts, warnings, and notifications. If a synchronization probe is also present, then the problem coil can also be properly identified.

The What … Endwinding Vibration
… because the endwinding vibration monitoring system automatically calculates the total, radial and tangential displacement and velocity, then the output of the
Guard monitor is only these values. As such, the DCS can be configured to trend these values and to issue alerts, warnings, and notifications. This makes it
possible to determine where any vibration is occurring and if the vibration correlates with load or temperature variations.

The What … Shaft Voltage and Current
… because the shaft monitoring system automatically calculates
the voltage and current of up to 4 sensors then the output of the
Guard monitor is only these values. As such, the DCS can be
configured to trend these values and to issue alerts, warnings, and
notifications. This makes it possible to determine if the grounding
brush is adequately functioning to protect the bearing insulation.