AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[email protected]
PAGE. 18
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Voltage & Frequency Relay (MV12);
Relay MV12 is a single phase, over voltage or under Voltage relay with one
measuring element. The relay can be used for feeder protection in all low voltage, medium voltage and high voltage sub-
stations. DIP switches are provided on the front pannel for pick-up and time delay setting. User has a choise of 7 trip time
characteristics.
Features;
Micro-controller based design.
Draw Out type construction, Inverse & Definite time trip characteristics.
VOLTAGE & FREQUENCY RELAY (MV12);
Item
VOLTAGE & FREQUENCY RELAY
Make
L&T
Model
MV12
Rate Voltage (Vn)
110/ 240/ 415V AC (Field Selectable)
Rated Frequency
50Hz ± 2.5 Hz
Auxiliary Power Supply
24V to 110V AC/DC or 95V to 240V AC/DC
Relay Setting
Pick Up Voltage (Vs):
Over Voltage Mode
= 105% to 180% of
Vn
in steps of 5%.
Under Voltage Mode =
95% to 20% of
Vn
in Steps of 5%.
Time Multiplier
= 0.1 to 1.6 in Steps of 0.1
Operating
Characteristics
Time Current Characteristics;
Normal Inverse 3.5 sec in O/V mode.
Normal Inverse 5.7 sec in U/V mode.
Definite Time : 1, 10, 100 Sec
Pick-up Voltage:
Same as set Voltage
Vs
Reset Voltage:
(90% to 95%) of Set Voltage
Vs
(105% to 110%) of Set Voltage Vs for under Voltage
Accuracy : ± 5% of
Vs
Operating Time:
Normal Inverse - As per IS3231:1987. Please
refer fig.2 for details (The Curve is given for Vn=110V. For
Vn=240V and Vn=415V, it is limited by overload capacity.
Definite Time:
Three Ranges (1 Sec, 10 Sec, 100 Sec). Time = TMS x Range c)
With three ranges as above, user can get a definite time delay
from 0.1 Sec to 160 Sec.
Accuracy :
As per Error Class 5 of IS3221:1987
Reset Time
: Less than 50 millisecond
Burden
Less than 0.25 VA at PT input.
Less than 8 VA at Auxiliary Power Supply
Operation Indicators
Separate LED indications for:
Power On
,
Over Voltage, Under Voltage
Trip Status (LED blinks when input crosses set Point and becomes
steady on when relay has tripped LED has to be manually reset).
Time current characteristics selected.
Output Relay Contacts
2 c/o conacts for trip signal (self reset)
Output Contact rating
Rated Voltage : 250V AC/ 30V DC Max S/W Voltage : 440V AC/
300V DC Rate Current : 8A Max Current : 14A Rated
Breaking Capacity : 2000VA/ 240W (Resistive)
Overload Capacity
800 Volts
Case
Front Bezel = 158 x 71 mm,
Pannel Cutout = 150 x 62 mm
Depth = 224 mm
Weight
0.9 Kg Approx
