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WorksheetsPartial Discharge and Shaft Monitoring Quiz
Total questions: 20
Worksheet time: 15mins
What is the main benefit of online Partial Discharge (PD) monitoring?
Reduces power generation capacity
Allows early detection without machine shutdown
Increases insulation stress
Reduces generator size
Which part of the generator is most commonly affected by Partial Discharge issues according to failure statistics?
Rotor winding
Stator winding
Bearings
Shaft
What is the typical dielectric strength of air inside a void where PD may occur?
300 kV/mm
30 kV/mm
3 kV/mm
0.3 kV/mm
What failure mode is associated with the formation of voids due to improper resin application during coil manufacturing?
Endwinding contamination
Loose windings
Poor impregnation
Inadequate spacing
In shaft monitoring, what condition may be indicated by very low grounding brush current?
High shaft voltage
Proper grounding
Poor grounding
Shaft rub
What monitoring module is used with the IRIS GuardII+ system to detect shaft voltage?
PDA
RFA
SM
CSA
What component in the Partial Discharge system helps in noise separation using time-of-arrival?
Voltage brush
Shunt resistor
Double-ended installation with couplers
Thermocouple
What symptom can result from poor brush contact with the shaft surface?
Rotor imbalance
Shaft and bearing pitting
Shaft alignment
Temperature rise
Which of the following is NOT a cause of high shaft voltage?
Magnetized nearby parts
Vibration of stator core
Static excitation spikes
Turbine steam
Which issue does the term "ladder effect" in slot discharge refer to?
Voltage imbalance in the generator
Magnetic field asymmetry
Electrical slot discharge from loose windings
Misalignment of shaft
Which factor does NOT contribute to Thermal Deterioration in stator windings?
Overloading
Unbalanced voltage
Proper cooling
Defective cooling
What does IRIS GuardII+ use to store long-term data for trending and diagnostics?
Cloud storage
Trigger-based Archive
Real-time streaming
Onboard USB only
What is the main purpose of Time Domain Reflectance (TDR) testing in PD systems?
Detect rotor short circuit
Measure voltage spike magnitude
Calculate coaxial cable length
Measure insulation temperature
Which component is used to sense shaft current in the Shaft Monitoring System?
Voltage brush
IRIS PD coupler
Shunt resistor
Thermistor
What environmental factor is considered under the "TEAM" operational stress model?
Electromagnetic Interference
Temperature
Moisture
Hydrogen
What does a very high voltage signal from the shaft voltage brush usually indicate?
Normal operation
Faulty shunt
Danger of insulation breakdown
Overheated bearing
What are the causes of Endwinding Discharges?
High rotor speed and cooling
Grading losing ground contact
Over-greasing of bearings
Magnetic field distortion
What is the function of equal-length coaxial cables in the PD system?
Reduce voltage spikes
Match impedance
Eliminate circulating current and delay variation
Lower frequency noise
What phenomenon can cause Nitric Acid formation during PD events?
High humidity
Presence of oil vapors
Reaction of ozone and nitrogen
High-frequency magnetic flux
Which software is used to view Shaft Monitoring (SM) data from the IRIS GuardII+ system?
PDView
SMGuard
SMView
ShaftScope
