CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2-23
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
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)
2.5.5 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
URs equipped with 24 CT inputs have a maximum operating temperature of 50°C
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
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
Tolerance: ±10%
Contacts per common return: 2
Recognition time: < 1 ms
Debounce time: 0.0 to 16.0 ms in steps of 0.5
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