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INDUSTRIES

TOTAL CONDITION MONITORING FOR ROTATING MACHINERY

Hydro

Bearing and Casing Vibration

Meggitt’s velocity sensors and accelerometers measure absolute vibration of the casing and on the bearings of hydro turbines. Operators analyzing the signals can identify vibrations that forewarn of bearing failure. Because they take measurements directly, Meggitt’s velocity sensors provide excellent resolution and high-amplitude signals down to very low frequencies. Accelerometers are effective at detecting cavitation, and any other high-frequency phenomenon. If cavitation is detected, operators can quickly alter control parameters to eliminate the effect.

Partial discharge

Partial discharges signify that insulation is breaking down. If not addressed, this electrical arcing can destroy the generator. Meggitt’s partial discharge monitoring system provides additional protection for critical power-generating machinery. Early detection enables condition. based maintenance to take place at a convenient time, increasing reliability and minimizing repair costs. Coupling capacitors are the hallmark of this leading-edge technology. Their robust design and safe, stable and reliable performance make it possible to install them extremely close to the windings, maximizing the sensors’ sensitivity.

Air-gap

Over time, heavy machinery can shift in its foundations and, if subjected to fluctuating temperatures, expand and contract. Such situations in hydro plants can bring moving and stationary parts of the generator closer together. Air-gap sensors measure the gap between the rotor poles and the stator walls. A small air gap is desirable to optimize efficiency. If the gap narrows too much, it can cause components to rub. The monitoring system sets off advance warning to prevent this from happening.