Megger Three-Phase TTR - Page 50

M
AVTMTTR330 Rev 3 March 2010
42
Test Frequency
Same as line frequency.
Loading of Test Transformer
Less than 0.2 VA
Measuring Ranges
Turn ratio:
80 V ac: 0.8 to 45,000, 5 digit resolution
40 V ac: 0.8 to 25,000, 5 digit resolution
8V ac: 0.8 to 8,000, 5 digit resolution
Excitation Current: 0 to 500 mA, 3 digit resolution
Phase Angle
Deviation:
± 90 degrees, 1 decimal point for the minutes display, 2
decimal point for the degree display, 2 decimal points
for the centiradian display
Accuracy
Turn ratio:
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10000)
±0.3% (10001 to 45000)
40 V ac:
±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10000)
±0.35% (10001 to 25000)
8 V ac:
±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.35% (4001 to 8000)
Excitation Current (rms): ±(2% of reading + 1 digit)
Phase Angle Deviation: ±3 minutes