15/05/96
6
MPC2000 01/96B
3.1.2 Phase Current Inputs
Method:
True RMS, Sample time 0.5mS
Range:
0.05 to 12 x Phase CT Primary Amps
Full Scale
12 x Phase CT Primary Amp s setting
Accuracy:
+/- 1.5% for 0.9 to 1.5 x CT Primary
+/- 5% above 1.5 x CT Primary
+/- 3% + 0.02 below 0.9 x CT Primary
3.1.3. Earth Fault Current Inputs
Method:
True RMS, sample time 0.5mS
Range:
0.05 to 1.0 x E/F CT Primary
Full Scale:
1.0 x E/F CT Primary Amps Setting
Accuracy:
+/- 1.5% of Full Scale
3.1.4. Line Voltage Inputs
Method:
True RMS, sample time 0.5mS
Without VT Transformer
Range:
90 - 660V AC
Accuracy:
+/- 1.0% of Full Scale
With VT Transformer
Range:
90 - 660V x (VT Primary/VT Secondary)
Limited to 25kV
Accuracy:
+/- 1.0% of Full Scale
3.1.5. Thermistor/RTD Inputs
Time Delay:
0.5 +/- 0.2 seconds
Thermistors
Range:
0.1 - 30 Kilo-Ohms
Accuracy:
+/- 0.1 Kilo-Ohm up to 5 Kilo-Ohm
+/- 3% above 5 Kilo-Ohm
RTD's
Range:
100 to 240 Ohms
Accuracy:
+/- 3%
Max. Wire Resistance:
25 Ohms
3.1.6. Overload Alarm and Trip Curves
