Installation and Operating Instructions - Crompton Instruments

REAL TIME CLOCK
Accuracy
Ageing
Resolution
Battery Type
Battery Life (No auxiliary)
± 1 minute per month
± 3 ppm (parts per million) per year
0.1 seconds
Lithium (Return product to factory
for replacement)
3 years
MEASURING RANGES
Values of measured quantities for which errors are defined.
Voltage 20 … 120%
Current 20 ….. 120% (functional 5%...500%)
Frequency
45 … 66 Hz
Active power (Watt) 5 ….. 120%
Power Factor
0.5..1..0.5, Importing or Exporting
ACCURACY AND RESOLUTION
The electrical measurements and trip functions have the following accuracy levels. The
resolution of these settings or measurements will change dynamically, depending on any PT or
CT ratio settings. Under some operating conditions, occasionally single values observed via
modbus may lie slightly outside specified accuracy limits. However preceding and succeeding
values will be within specified limits.
Voltage
Accuracy
+/- 1% of nominal input voltage
Resolution 0.1 Volt for system Voltages of 57.7 to 999.9V
1 Volt for system Voltages of 1kV to 9.999kV
10 Volt for system Voltages of 10kV to 99.99kV
100 Volt for system Voltages of 100kV to 400kV
Current
Accuracy
Resolution
Frequency
Accuracy
Resolution
+/- 2.5% of nominal input
0.01A for system currents of 0.01 A to 99.99 Amps
0.1A for system currents of 100 A to 999.9 Amps
1A for system currents of 1 kA to 9.999 kA
+/- 0.03 Hz of nominal
0.01 Hz
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