AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:admin@aumshivay.com
PAGE. 15
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Transformer Instantaneous Earth Fault Relay (S14S);
Relay SC14S is a self-powered, single-phase, non-
directional, Earth fault relay with one measuring element. The relay can be used for differential protection of generators, REF
applications of generators and transformers in all low voltage, medium voltage and high voltage sub-stations. The relay’s solid-
state design offers seven fields selectable pick up current settings. There are two time delay options in addition to instantaneous
trip–100 millisecond and 200 millisecond. The relay has a built in third harmonic filter to avoid spurious tripping in harmonic
rich power systems.
Features:
Micro-controller based design
Draw out facility.
Built in Third Harmonic Filter (It helps to avoid spurious tripping in harmonic rich power systems)
Instantaneous time delay or delay of 100 ms, 200 ms can be set
Current Input: 1A / 5A.
Application:
These relay can be used for differential protection of generators, REF applications of generators and transformers in all
low voltage, medium voltage sub-stations.
TRANSFORMER INSTANTANEOUS EARTH FAULT RELAY (SC14S)
Item
Transformer Instantaneous Earth Fault Relay
Make
L&T
Model
SC14S
Relay Ratings
Nominal Current (In) : 1A or 5A
Frequency : 50Hz ± 2.5 Hz
Auxiliary Power Supply
Self powered
Relay Settings
Current (Is):
One of the two ranges (factory set)
10% to 40% of In in steps of 5% or
20% to 80% of In in steps of 10 %
CT Burden
Less than 1.0 VA at Is min
Less than 6 VA at Is max
Operating
Characteristics
Front panel programmable, using push buttons.
Pick up current :
Same as set current Is
Operating time:
Field selectable
Instantaneous (Typical 25 ms @ 3 Is) or 100 msec, 200
msec ( at 3 Is)
Accuracy
As per Error class 5 of IS 3231: 1987
Over Load capacity
20 times set current Is for 3 sec
Operation Indicators
LED indication
Flag indication (manual reset)
Output Relay Contacts
2 C/O contacts for trip signal (self reset)
Output contact rating
Rated voltage : 250V AC/ 30V DC Rated
current : 5A Rated
Breaking Capacity: 2000VA/240W (Resistive)
Case
Draw out case;
Front Bezel
: 158 x 71 mm,
Panel Cutout
: 142 x 62
mm,
Depth :
224 mm
Weight
1.0 kg approx.
