QUALITROL-IRIS POWER, THE WORLD’S LARGEST PROVIDER OF ON-LINE PERIODIC AND CONTINUOUS PARTIAL DISCHARGE MEASUREMENT SYSTEMS Iris Power PDA-IVTM Periodic On-line Partial Discharge Monitoring Using a Portable Instrument for Hydro Generators “By combining on-line monitoring and a diminished schedule of off-line testing, the utility has switched from time-based to a condition-based procedure for allocating resources for testing and maintenance…, the maintenance staff can discern more thoroughly the condition of the insulation and what, if any, repairs or changes in operating procedures need to be done to increase the lifespan of the unit.” IRIS POWER ON-LINE PRODUCTS

IRIS POWER PDA-IV PERIODIC ON-LINE PARTIAL DISCHARGE MONITORING OF HYDRO GENERATORS The test enables predictive maintenance on hydro generator stator windings, resulting in the increased availability and extension of operating life. The technique was introduced more than three decades ago and has since been used on over 5000 hydro generators to identify deteriorated stator windings. The method is non-destructive and based on proven scientific and empirical principles and is recommended by manufacturers and industry standards such as the IEEE Std. 1434-2000. The monitoring technique is based on...

IRIS POWER PDA-IV IRIS POWER PDA-IV TEST PROCEDURE With the generator operating under normal service conditions, the operator connects the Iris Power PDA-IV instrument to a coupler termination box and to a portable computer running the Iris Power software. The magnitude, phase position and number of partial discharge pulses detected at each coupler are then recorded and can be viewed immediately, or stored for a subsequent analysis. The results presented to the user include: • graphs depicting the nature and severity of particular insulation aging mechanisms • trend curves highlighting the progression...

IRIS POWER PDA-IV DETECTION OF PARTIAL DISCHARGES Partial discharges in degrading high voltage stator windings give rise to small voltage pulses which travel through the stator winding. The magnitude and number of these pulses depends on the degree of insulation deterioration. That is, as the magnitude and number of partial discharge voltage pulses increase, the rate of the electrical insulation deterioration must also be increasing. The partial discharge signals are often mixed with electrical noise from sources such as corona and output bus arcing, but are separated for analysis by the Iris...