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Generator protection has traditionally only measured stator AC currents and voltages. Measurement of rotor DC current was typically more difficult and required special measurement equipment (e.g. resistive shunt) in the rotor DC circuit. With advance of numerical technology it is now actually feasible for modern Intelligent Electronic Devises (i.e. IEDs) to measure the rotor winding DC current by...
The overexcitation limit of synchronous generator plays an important role in the voltage stability of power systems. Achieving maximum use of the overexcitation capability requires adequate coordination between generator control and protection. This paper provides an example of coordination between overexcitation limiter (OEL), field overcurrent protection and automatic voltage regulator (AVR) for...
Flux monitoring via air gap flux probes is a proven technology used for many years in synchronous machines to determine the presence of turn-to-turn shorts in a rotor winding. This information is critical in planning maintenance outages and in augmenting on-line vibration analysis. Traditionally, flux measurements have been done using flux probes installed on a stator wedge and a portable or permanently...
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