As part of an integrated performance monitoring package, early detection of shorted turns can reduce the risk of failure, and lead to optimized plant utilization.

Want more information? You can download the datasheet in PDF format.

Rita detects small levels of even harmonics within the rotor caused by shorted turns, as these shorts become larger they cause rotor bowing due to asymmetrical loads and heating. Rita detects these shorts before they become a problem or are detected by other means, such as bearing pedestal vibration. As the shorts increase, Rita output increases, providing continuous information on the rotor’s condition.

Studies have shown that even harmonics present within the rotor are an early indication of shorts within the rotor windings. Rita detects these harmonics online continuously. As part of a monitoring and surveillance package Rita can give early indication of rotor faults, increasing the engineers’ knowledge of the plant. This increased knowledge helps to prevent down time, can lead to more optimal use of the plant, and in conjunction with other techniques can lead to on condition maintenance.

Rita is easily installed near to the rotor, the ruggedized case prevents unauthorized access to the unit, protects the unit, and eases installation. Connections to Rita are via industry standard rugged connectors. Input signals are fed from a set of air gap search coils or Rogowski coils within the generator. Rita has a range of gain and input settings to match the signals from the rotor. Rita then accurately measures the even harmonics within a generator or rotating electrical unit, an alarm threshold level is set and a time window to reduce false triggering. A set of relay contacts allow the connection of external alarm indicators, as well as a current source which is available for transmission to logging and monitoring systems in control rooms.