Predictive Monitoring Services

Key Failure Modes detection with PdM services Failure Mode PdM Services (required sensors) GENERATOR STATOR Bar or coil short circuit to ground YES (partialdischarge analyzer) Poor winding insulation / Insulation surface damage / Partial discharge YES (partialdischarge analyzer) Wedging system failure / Cooler issues (clogging, fouling, pump, fan) YES (temp, pressure, flow, fan speed, motor current) Core looseness and overheat YES (vib, temp) Frame looseness and overheat YES (vib, temp) End windings looseness YES (vib) GENERATOR ROTOR Cracks in interpole connectors YES (wireless temp sensor) Brush and slip ring excessive wear YES (brush wear measurement probe) Winding coil failure YES (temp, flux,shaft current) Roundness issue YES (air gap, vib, temp) Unbalance (magnetic, magnetic pull) YES (vib) BEARINGS Contamination in oil YES (oilcontamination sensors) Lack of water flow YES (flowmeter) Lack of verticality YES (proximityprobe, temperature &vibration) Pad alignment YES (pad vibration) Bearing issue (looseness, wear, shock) YES (vib, temp, pressure) Thrust Bearing pad alignment YES (vib, temp, pressure) Bearing Lube oil cooler issues YES ( temp, flow, pressure, motor current, water content detection) BALANCE OF PLANT AC/DC inverter issues YES (voltage,current, temp) Unit transformer issues (windings, oil, bushing, fan, ..) YES (voltage,current, temp, gas) Trash rack pluggage YES (level, flow) Seepage/Drainage system issue YES (level,motor current) Spillway gates opening/closing issue YES (oil level,pressure, temp) Air compressor issue YES (temp, pressure) Brake system wear YES (pressure) Failure Mode PdM Services (required sensors) RUNNER Cavitation YES (accelerometers) Runner cracks / Kaplan hub oil leaks to river YES (oil levelor water in oil monitoring) Kaplan hub wear YES (continuous time, pressure & position monitoring) Runner clearance and labyrinth seal issues YES (prox) Head cover vibration YES (vib) Valves operations issue (air injection, dissolved oxygen) YES (position,vib) DISTRIBUTOR Distributor excessive friction YES (continuous time, pressure & position monitoring) Wicket gate bushing & seals, leaks YES partially (vibration) Distributor internal leakage YES (inletvalvedifferentialpressure, braking time) Shear pin break YES (individualshear pin sensor, vibration) Cam drift YES (continuousposition, vib) Oil Pressure Unit issues YES (position,pressure, temp, level, pump) TRANSVERSE Abrasion by sediment, corrosion YES partially (efficiency). Is there a commercial system continuously monitoring abrasion? Loss of performance YES Shaft seal wear YES (proximityprobe monitoringshaft seal wear) Shaft seal failures (leak, wear) YES (prox, pressure, temp, flow) Penstock pressure fluctuation issue YES (pressure) Draft tube vibration issue YES (pressure level,vib) Unbalance (hydraulic, mechanical) YES (prox) Shaft misalignment YES (vib) *Contact GE to receive the latest Digital Hydro Predictive Analytics Catalog. All the Electromechanical Equipment is Covered with the 250+ Predictive Analytics Catalog*