SATEC SA300 ezPAC Operation Manual - Manual (Page 181)

Appendix E Data Scales
SA300 Substation Automation Unit 181
Appendix E Data Scales
The maximum values for volts, amps and power in the SA300 setup and in
communications are limited by the voltage and current scale settings. See
Advanced
Device Setup in Chapter 7 on how to change the voltage and current scales in your
device.
The following table shows the device data scales.
Scale Conditions Range
Maximum voltage (V max) All configurations Voltage scale × PT Ratio, V 1
Maximum current (I max) All configurations Current scale × CT Ratio, A 2, 3
Maximum fault current (Ix max) All configurations 30 × CT primary current, A
Maximum Power (P max) 4 All configurations V max × I max × 2, W
Maximum frequency 50 or 60 Hz 100 Hz
1 The default voltage scale is 828V. The recommended voltage scale is 120V+20% = 144V for
using with external PT’s, and 690V+20% = 828V for a direct connection to power line.
2 CT Ratio = CT primary current/CT secondary current
3 The default current scale is 2 × CT secondary for the IEC current input option (2.0A with 1A
secondaries and 10.0A with 5A secondaries), and 4 × CT secondary for the ANSI current input
option (4.0A with 1A secondaries and 20.0A with 5A secondaries).
4 Maximum power is rounded to whole kilowatts. With PT=1.0, it is limited to 9,999,000 W.