2-44
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 2: PRODUCT DESCRIPTION
2
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)
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%
2.6.5 Inputs
AC CURRENT
CT rated primary:
1 to 50000 A
CT rated secondary:
1 A 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:
45 to 65 Hz
CONTACT INPUTS
Dry contacts:
1000
Ω
maximum
Wet contacts:
300 V DC maximum
Selectable thresholds:
17 V, 33 V, 84 V, 166 V
Tolerance:
±10%
Contacts per common return:
4
Recognition time:
< 1 ms
Debounce time:
0.0 to 16.0 ms in steps of 0.5
Continuous current draw:
4 mA (when energized)
CONTACT INPUTS WITH AUTO-BURNISHING
Dry contacts:
1000
Ω
maximum
Wet contacts:
300 V DC maximum
Selectable thresholds:
17 V, 33 V, 84 V, 166 V
