AccuLoss is a complete three-phase transformer measuring system designed for power frequency testing and calibration of medium and large power transformers, large motors and turbines. This measurement system follows the latest specifications dealing with the calibration of test systems to measure losses. The measurement capabilities of the various models of AccuLoss are from a few amps up to 6,000 amps and voltages from 100 V up to 300 kV (line to ground) and frequencies from 40 to 400 Hz. Using state of the art technology the AccuLoss series have the highest accuracy available on the market. AccuLoss systems have been used in the field for more than 20 years now.
The technology for the AccuLoss series of loss measurement systems is based on the two-stagecompensated current comparator technology. The current input features a two-stage-compensated current transformer with a ratio of 1000:1 or 2000:1. Current ranging is performed in the power analyser with 10 current ranges. On the voltage side a high voltage standard capacitor and an active voltage divider with 7 voltage ranges are used. The voltage divider has a built in two-stage-compensated current transformer which automatically corrects for any drifts in the electronics, there are no adjustments required and as a result both the voltage divider and current divider maintain their accuracy over several years of operation. Full Scale accuracy can be maintained over the full range of both voltage and current. Both single and 3-phase measurements can be performed.
System accuracies are better than any system available on the market today with full scale power measurements < 40 ppm in magnitude and phase and voltage and current measurements to < 0.05%. All accuracy specifications are specified as 2 sigma. The high-voltage dividers use a currentcomparator to automatically correct for any drifts or offsets in magnitude and phase. The Model 7021U TwoS t a g e – C u r r e n t transformer is passive, and the accuracy is not affected by age. The system is completely automated and requires no manual intervention during operation. Individual or continuous measurements can be made. The components of the AccuLoss System have exceptional reliability, having years of operational experience in the rugged transformer test environment. The software provided for the system is written in LAB VIEW. Each power analyser has independent 2-volt full-scale outputs. Using these outputs with a National Instrument A/D card, harmonics are extracted up to the 25th and displayed on one of the software menu screens.
The AccuLoss System is a completely automated, rugged test system that maximizes throughput resulting in a short payback period in the time sensitive transformer test industry.
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