GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 40)

Metering 40
4
4.5 Metering accuracy
Table 4-2 shows the metering accuracy for Wh, varh, VAh, W, var, and VA under the following
conditions:
•
Nominal frequency
•
Nominal voltage
•
Power factor of 0.85 to 1.00 for Wh and VAh
•
Power factor of 0.00 to 0.15 for varh
Table 4-3 shows the voltage accuracy at nominal frequency:
Table 4-4 shows the current accuracy at nominal frequency:
Table 4-2 Metering accuracy for Wh, varh, VAh, W, var, and VA
Current (percent of nominal CT rating) Accuracy (percent of reading, includes
current and voltage sensors)
10% ± 5.0%
30% ± 4.5%
50% ± 4.0%
75% ± 3.0%
85-100% ± 2.0%
Table 4-3 Voltage accuracy at nominal frequency
Current (percent of nominal PT rating) Accuracy (percent of reading, includes
voltage sensors)
50% ± 2.0%
75% ± 1.5%
85-100% ± 0.8%
Table 4-4 Current accuracy at nominal frequency
Current (percent of nominal CT rating) Accuracy (percent of reading, includes
current sensors)
10% ± 3.5%
30% ± 3.25%
50% ± 2.75%
75% ± 1.75%
85-100% ± 0.8%