Generators & HV Rotating Machines
A Vital Asset
Rotating machines, such as motors and generators, are highly important components in power generation and industrial applications. Machine reliability and availability are therefore in high demand. Premature failure may lead to significant economical losses, due to unexpected outages and possible damage to the asset itself. To plan maintenance effectively, it is essential to have accurate condition information about when components need repairing or replacing.
A variety of electrical tests can be performed over the complete life cycle of the machines to increase their reliability, prevent premature failures and to extend reliable service life. Off-line diagnostic tests provide you with a snapshot of current condition and detect possible defects. Temporary and permanent on-line monitoring enable continuous condition assessment under normal operating conditions.
Some Stress Factors in Rotating Machines
- Thermal stress: Highest and lowest temperature, overload, hot spots.
- Electrical stress: Surges, over voltages, rated voltage, partial discharge (PD).
- Ambient stress: Moisture and contaminants.
- Mechanical stress: Vibration, oscillation in slot sections and in end winding.
Our Comprehensive list of Rotating Machine Diagnostic Techniques
- DC Winding Resistance.
- DC Insulation Resistance, Polarization Index(PI), Dielectric Absorption Ratio(DAR).
- Variable Frequency Capacitance & Power/Dissipation Factor (C&DF).
- Sweep Frequency Response Analysis(SFRA).
- Dielectric Frequency Response(DFR).
- Surge Tests.
- AC (50/60 Hz) Withstand.
- AC (50/60 Hz) offline Partial Discharge( multi point, broad band and narrow band).
- Online Partial Discharge monitoring.
- Excitation Current measurement.
- Leakage Reactance measurements.
- Protection and Operation checks.