CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
2-27
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
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)
DEMAND
Measurements:
Phases A, B, and C present and maximum measured currents
3-Phase Power (P, Q, and S) present and maximum measured currents
Accuracy:
±2.0%
2.5.5 Inputs
AC CURRENT
CT rated primary:
1 to 50000 A
CT rated secondary:
1 or 5 A by connection
Relay burden:
< 0.2 VA at rated secondary
Conversion range:
Standard CT:
0.02 to 46
×
CT rating RMS symmetrical
Sensitive Ground CT module:
0.002 to 4.6
×
CT rating RMS symmetrical
Current withstand:
20 ms at 250 times rated
1 sec at 100 times rated
continuous 4xInom
Short circuit rating:
150000 RMS symmetrical amperes, 250 V maximum (primary current to external CT)
AC VOLTAGE
VT rated secondary:
50.0 to 240.0 V
VT ratio:
1.00 to 24000.00
Relay burden:
< 0.25 VA at 120 V
Conversion range:
1 to 275 V
Voltage withstand:
continuous at 260 V to neutral
1 min/hr at 420 V to neutral
FREQUENCY
Nominal frequency setting:
25 to 60 Hz
Sampling frequency:
64 samples per power cycle
Tracking frequency range:
20 to 70 Hz
CONTACT INPUTS
Dry contacts:
1000
Ω
maximum
Wet contacts:
300 V DC maximum
Selectable thresholds:
17 V, 33 V, 84 V, 166 V