AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[email protected]
PAGE. 7
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
MOTOR
PROTECTION RELAY
Motor Protection Relay;
These Motor Protection Relay’s have designed for the protection and active security of medium
and large size induction motors. The relay also computes the positive (Id) and negative (Is) sequence components of phase-
current system. The earth current input circuit includes a 3rd harmonic active filter.
TECHNICAL SPECIFICATIONS
Real Time Measurements
T/Tn- IA - IB - IC - Io - I1 - I2
Maximum Demand and
Inrush Recording
T/Tn - IA - IB - IC - Io - I1 - I2 - tstart
Programmable Input
Quantities
Fn
= System frequency : (50 - 60)Hz
In
= Rated primary current of phase Cts : (1 - 9999)A, step 1A
On
= Rated primary current of earth fault detection Cts : (1 - 9999)A, step 1A
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)
Thermal Image
The current I producing motor warming-up is computed as a conventional composition
of positive and negative sequence
components of the motor current.
Locked Rotor
Trip Current level : ILR = (1 - 5)Im, step 0.1Im
Inhibition time at motor starting: 2tst
Trip time delay: tLr = (1 - 25)s, step 1s
Current Unbalance
Negative sequence current: Is> = (0.1 - 0.8)Im, step 0.1Im
Inverse time current curve: tIs> = (1 - 8)s, step 1s (tIs> = trip time @ Is = In)
MOTOR PROTECTION RELAY (MM30-743)
Description
MM30 Comprehensive Motor Protection
Make
L&T
Model
MM30
Specifications
MM30 is a Microprocessor based Comprehensive Motor
Protection Relay designed for Medium and Large Motors.
