2-24
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 2: PRODUCT DESCRIPTION
2
2.5.4 Metering
RMS CURRENT: PHASE, NEUTRAL, AND GROUND
Accuracy at
0.1 to 2.0
×
CT rating:
±0.25% of reading or ±0.1% of rated (whichever is greater)
>
2.0
×
CT rating:
±1.0% of reading
RMS VOLTAGE
Accuracy:
±0.5% of reading from 10 to 208 V
REAL POWER (WATTS)
Accuracy at 0.1 to 1.5 x CT rating and 0.8 to 1.2 x VT rating:
±1.0% of reading at –1.0
≤
PF < –0.8 and 0.8 < PF
≤
10
REACTIVE POWER (VARS)
Accuracy at 0.1 to 1.5 x CT rating and 0.8 to 1.2 x VT rating:
±1.0% of reading at –0.2
≤
PF
≤
0.2
APPARENT POWER (VA)
Accuracy at 0.1 to 1.5 x CT rating and 0.8 to 1.2 x VT rating:
±1.0% of reading
WATT-HOURS (POSITIVE AND NEGATIVE)
Accuracy:
±2.0% of reading
Range:
±0 to 1
×
10
6
MWh
Parameters:
three-phase only
Update rate:
50 ms
VAR-HOURS (POSITIVE AND NEGATIVE)
Accuracy:
±2.0% of reading
Range:
±0 to 1
×
10
6
Mvarh
Parameters:
three-phase only
Update rate:
50 ms
CURRENT HARMONICS
Harmonics:
2nd to 25th harmonic: per phase, displayed as a % of f
1
(
fundamental frequency phasor)
THD: per phase, displayed as a % of f
1
Accuracy:
HARMONICS:
1. f
1
> 0.4pu: (0.20% + 0.035% / harmonic) of reading or 0.15% of 100%, whichever is greater
2. f
1
< 0.4pu: as above plus %error of f
1
THD:
1. f
1
> 0.4pu: (0.25% + 0.035% / harmonic) of reading or 0.20% of 100%, whichever is greater
2. f
1
< 0.4pu: as above plus %error of f
1
VOLTAGE HARMONICS
Harmonics:
2nd to 25th harmonic: per phase, displayed as a % of f
1
(
fundamental frequency phasor)
THD: per phase, displayed as a % of f
1
Accuracy:
HARMONICS:
1. f
1
> 0.4pu: (0.20% + 0.035% / harmonic) of reading or 0.15% of 100%, whichever is greater
2. f
1
< 0.4pu: as above plus %error of f
1
THD:
1. f
1
> 0.4pu: (0.25% + 0.035% / harmonic) of reading or 0.20% of 100%, whichever is greater
2. f
1
< 0.4pu: as above plus %error of f
1
FREQUENCY
Accuracy at
V = 0.8 to 1.2 pu:
±0.001 Hz (when voltage signal is used for frequency measurement)
I = 0.1 to 0.25 pu:
±0.005 Hz
I > 0.25 pu:
±0.02 Hz (when current signal is used for frequency measurement)