ABB REL-300, Instruction Leaflet

Page: 36 / 135

I.L. 40-385.1B
2-2 (5/92)
2.2 EXTERNAL CONNECTIONS
Terminal blocks located on the rear of the chassis
suitable for #14 square tongue lugs
Wiring to FT-14 switches suitable for #12 wire lugs
2.3 CONTACT DATA
Trip Contacts - make & carry 30 A for 1 second, 10
A continuous capability, break 50 watts resistive or
25 watts with L/R =.045 seconds
• Non-Trip Contacts
1A Continuous
0.1A Resistive Interrupt Capability
Supports 1000 Vac across open contacts
Contacts also meet IEC - 255-6A, IEC - 255-12, IEC
-255-16, BS142-1982.
2.4 MEASUREMENTS
Number of zones: 3 zones are standard (optional pi-
lot adds additional zone).
Operating Characteristics: variable mho characteris-
tics for all fault types.
2.5 MEASUREMENT UNITS
Three variable mho phase-to-earth units and one
variable mho phase-to-phase impedance unit per
zone.
One ground directional (ITG) and one phase direc-
tional (ITP) high-set overcurrent unit.
Three-phase non-directional overcurrent units (IL)
for load loss trip and CIFT.
One non-directional ground overcurrent unit medium
set (IOM) for ground supervision.
One ground overcurrent unit for LOI monitoring.
One inverse time overcurrent ground unit with CO
characteristics (see Figures 2-1 thru 2-7); selectable
non-directional or directional capability.
One forward set instantaneous directional overcur-
rent ground unit. (Pilot-high resistance ground
faults.)
Three under-voltage units (LV) for weakfeed and
LOP supervision.
Four current change fault detectors, and three volt-
age change fault detectors.
One instantaneous overcurrent unit low set (IOS)
One reverse set instantaneous directional overcur-
rent ground unit (Pilot Carrier Start, Weakfeed, Tran-
sient Blocking)
2.6 SETTING RANGES
Phase and Ground Distance (Zone 1, 2, 3):
• 0.01-50 ohms in 0.01 ohm steps for 5 A (ct)
• 0.05-250 ohms in 0.05 ohm steps for 1 A (ct)
Zone Timers - Separate timers for phase and
ground:
• Zone 1 (No/Yes; 2 cycle delay if Yes is selected)
• Zone 2 (0.10 to 2.99 seconds in 0.01 second
steps, Block)
• Zone 3 (0.10 to 9.99 seconds in 0.01 second
steps, Block)
Forward Directional Ground Timer (FDGT)
• 0 to 15 cycles in 1 cycle steps, Block
Ohms per Unit Distance
• 0.300-1.500 in 0.001/DTYP (Km or Mi)
Inverse Time Overcurrent Ground Relay:
• Pickup (0.1-0.8) in 0.1 A increments for 1 A (ct).
• Pickup (0.5-4.0) in 0.5 A increments for 5A (ct).
Choice of 7 time-curve families (CO-2, 5, 6, 7, 8,
9, 11 Characteristics), 63 time curves per family.
(See Figures 2-1 thru 2-7.)
• Set for directional or non-directional operation.
High set instantaneous directional overcurrent trip
units - phase and ground (I
AH
, I
BH
, I
CH
, I
OH
).
• 2.0-150 in 0.5 A steps for 5 A (ct)
• 0.4-30 in 0.1 A steps for 1 A (ct)
2.7 GROUND, OVERCURRENT AND UNDER-
VOLTAGE UNITS
• (I
os
, I
om
, I
L
and LV)
Undervoltage level units (LVA, LVB, LVC and CIF)
for weakfeed and close-into-fault, from 40 to 60
Vrms in 1-volt steps.
Current Units (IAL, IBL, ICL)
• 0.5-10 in 0.5 A steps for 5 A (ct)
• 0.1-2 in 0.1 A steps for 1 A (ct)