AUMSHIVAY MC 12A User manual

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 1
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
FEEDER PROTECTION RELAY
Feeder Protection Relay (MC12A); Relay MC12A is a single phase, non-directional, over current or Earth fault
relay with one measuring element. The relay can be used for feeder protection in all low voltage, medium voltage and high
voltage sub-stations. The relay has a built in high set facility. DIP switches are provided on the front panel for pick up and
time delay settings. User has a choice of 7 trip time characteristics.
FEEDER PROTECTION RELAY (MC12A)
Item
Feeder Protection Relay
Make
L&T
Model
MC 12A
Specifications
1 phase, non-directional, Over Current or
Earth Fault Relay
Applications
The relay can be used for feeder protection in
all low voltage, medium voltage sub-stations.
The relay has a built in high set facility. DIP
switches are provided on the front panel for
pick up and time delay settings.
Features
Dual CT Rating
Draw out type construction
Micro controller based design
7 types of trip time characteristics available

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 2
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
TECHNICAL SPECIFICATIONS (FEEDER PROTECTION RELAY-MC12A)
Rated Current (In)
1A or 5A
Rated Frequency
50Hz ± 2.5 Hz
Auxiliary Power
Supply
24V to 110V AC/DC ± 10%
95V to 240V AC/DC ± 10%
Relay Settings
Current (IS): One of the three ranges (User selectable)
10% to 40% of In in steps of 2% or 20% to 80% of In in steps of 4 %
or 50% to 200% of in steps of 10%.
High-set Current (Ihs): 2 Is to 16 Is in steps of 2 Is and disable.
Time Multiplier TMS: 0.1 to 1.6 in steps of 0.1.
Operating
Characteristics
Front panel programmable, using push buttons.
Time /Current characteristics;
Pick up current; Same as set current Is.
Reset Current: 95% to 90% of set current Is.
Operating time :
Inverse time;
Four curves, As per IS 3231:1987.
a) Normal Inverse 3s
b) Normal Inverse 1.3s
c) Very Inverse
d) Extremely Inverse
Definite time;
Three curves as follows:
e) Definite Time 1s
f) Definite time 10s
g) Definite time 100s
Accuracy: As per Error class 5 of IS3231: 1987
Reset time: Less than 50 milli sec
High-set (Instantaneous trip):
Accuracy: As per Error class 5 of IS3231: 1987.
Operating time: Less than 50 ms for Iin < 1.5 Ihs
Less than 35 ms for Iin > 1.5 His (Iin = input current)
Burden
Less than 0.25 VA on all settings.
Less than 5.5 VA at Auxiliary Power supply
Operation Indicators
Separate LED indications for:
• Power on
• 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 contacts for trip signal (self reset)
Output contact rating
Rated voltage: 250 V AC / 30 V DC, Max. S/W voltage: 440 V AC / 300 V DC
Rated current: 8A , Max. Current: 14A
Rated Breaking Capacity: 2000VA / 240 W (Resistive)
Over Load capacity
2 In continuously, 20 times In for 1 sec.
Case
Front Bezel: 158 x 71 mm, Panel Cutout: 142 x 62 mm , Depth:224 mm
Weight
0.9 kg approx.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 3
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Feeder Protection Relay (nX Series); nX Series offer you numerical type 3 phase over current & Earth Fault
Relay. Its microcontroller based design offers you to choose from various field selectable IDMT & definite curves.
TECHNICAL SPECIFICATIONS (FEEDER PROTECTION RELAY-nX SERIES)
Rated Current (In)
1A or 5A
Dual Rating
Suitable for CT Sec 1A/5A
Universal Auxiliary Supply
24 –240 V AC/DC
Wide TMS Range
0.01 –1.60
Draw-out execution
With automatic CT shorting facility
Instantaneous
Over current and earth fault element
Communication
Through Modbus Protocol on RS485
Breaker
Control and failure protection
Auto-Doubling feature:
Avoid nuisance tripping on high inrush current
FEEDER PROTECTION RELAY (nX SERIES)
Item
Feeder Protection Relay
Make
L&T
Model
nX Series (MC31AnX –51, 51N, MC61AnX - 51,
51N, 50, 50N & MC61CnX - 51, 51N, 50, 50N +
Communication facility)
Specifications
1 phase, non-directional, Over Current or Earth
Fault Relay
Applications
The relay can be used for feeder protection in all
low voltage, medium voltage sub-stations. The
relay has a built in high set facility. DIP switches
are provided on the front panel for pick up and
time delay settings

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 4
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
GENERATOR PROTECTION RELAY
GENERATOR PROTECTION RELAY (MG30 & MG30-I); These are Multifunction Microprocessor Relay for
protection of medium/ large synchronous generators. The relay measures the RMS of three-phase currents and voltages and
computes the positive and negative sequence components of the Current system. A separate input is dedicated to the
measurement of the Neutral-to-Ground voltage and its harmonic components used for a complete Stator Ground Fault
protection. MG30 incorporates 5 output relays expandable up to 16 with the additional module REX-8.
Features;
Voltage-controlled over-current protection.
Thermal image element with pre-alarm level.
Reverse power protection.
Loss of Field protection.
PT s' fuse failure protection
Modbus Communication Protocol
Breaker Failure protection
Inadvertent C/B closure protection
Blocking Output and Blocking Input for pilot wire selectivity coordination.
GENERATOR PROTECTION RELAY (MG30 & MG30-I)
Item
Generator Protection Relay
Make
L&T
Model
MG30 & MG30-I
Generator Type
MG30: For Impedance Grounded (NGR / NGT)
Generators.
Applications
MG30 / is Multifunction Microprocessor Relay for
protection of medium/large synchronous
generators. The relay measures the RMS of three-
phase currents and voltages and computes the
positive and negative sequence components of the
Current system.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 5
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Generator Protection Relay (Md-32); Three-phase percentage biased differential protection relay for
generators and rotating machines, with stator earth fault or restricted earth fault element. Measurement of the System-
frequency differential current with DC offset and harmonic components rejection.
TECHNICAL SPECIFICATIONS
Real Time Measurements
IdA - IdB - IdC - Ido - I1A - I1B - I1C - I2A - I2B - I2C
Maximum Demand and Inrush Recording
IdA - IdB - IdC - Ido - I1A - I1B - I1C - I2A - I2B - I2C
Programmable Input Quantities
Fn = System frequency (50 - 60)Hz.
In = Rated primary current of phase CTs (1 - 9999)A, step 1A
Differential Protection
Current setting range: Id = (0.02 - 0.2)In, step 0.01
Instantaneous output: 30ms
2 Harmonic restraint level : 2H = (0.1 - 1.0)Id, step 0.01Id
First percent bias (0,5<IR /In<P): 1R = (2 - 20)%, step 1%,
Second percent bias (IR/In>P): 2R = (5 - 50)%, step 1%
Point of slope variation: P = (1 - 3), step 0.1
Over current Protection
Current setting range: I> = (0.5 - 10)In, step 0.01In
Instantaneous output: £ 30ms,
Definite time trip delay; tI> = (0.05 - 99)s, step 0.01s
Stator Earth Fault
Current setting range; Io = (0.01 - 1)Ion, step 0.01Ion
Instantaneous output: £ 30ms
Trip time delayed element: tIo = (0.02 - 9.99)s, step 0.01s
Breaker Failure Element
Trip time delay: tBF = (0.05 - 1.00)s, step 0.01s
Features:
Harmonic Restraint.
Phase Over-current protection and Phase Differential protection.
Dual slope programmable percentage bias curve.
Earth Fault or Restricted Earth Fault protection and Breaker Failure protection.
Modbus Communication Protocol.
GENERATOR PROTECTION RELAY (MD-32G)
Item
GENERATOR PROTECTION RELAY
Make
L&T
Model
MD32-G
Description
MD32-G is three-phase percentage biased
differential protection relay for generators
and rotating machines, with stator earth fault
or restricted earth fault element.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 6
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Generator Protection Relay (SC14S); 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.
TECHNICAL SPECIFICATIONS
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: 250 V AC / 30 V DC
Rated current: 5A
Rated Breaking Capacity: 2000VA / 240 W (Resistive)
Electrical performance:
Please refer separate document
Specifications
“ General Electrical Characteristics”
Case
Draw out case
Front Bezel: 158 x 71 mm
Panel Cutout: 142 x 62 mm
Depth: 224 mm
Weight
1.0 kg approx.
GENERATOR PROTECTION RELAY (SC14S)
Description
INSTANTANEOUS EARTH FAULT RELAY
Make
L&T
Model
SC14S
Specifications
1 phase, non-directional, Earth fault relay with one
measuring element.
Applications
The relay can be used for differential protection of
generators, REF applications of generators and
transformers in all low voltage, medium voltage sub-
stations.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
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.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 8
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
No-Load Running
Under current level: I< = (0.15-1)Im, step 0.01Im
Trip time delay: tI< = (0.1-90)s, step 0.1s
When current is below 0.1 Im the function is disabled
Earth Fault
Current setting range: O> = (0.02 - 2)On, step 0,01On
Istantaneous output : £ 0.03s (Reset time of instantaneous output : tO> + tBO)
Independent time delay : tO> = (0.05 - 5)s, step 0.01s
Over-current
Current setting range: I> = (1 - 5)Ist, step 0.1Ist (limited to 20 In)
Istantaneous output: £ 0.03s (Reset time of instantaneous output : tI> + tBO)
Independent time delay: tI> = (0.05 - 1)s, step 0.01s
Reset time delay of the blocking output relay : tBO = (0.05 - 0,5)s, step 0,01s
Limitation of N° of Starting
Numbers of startings: StNo = (1 - 60), step 1
Time interval for counting of StNo : tStNo = (1 - 60)min, step 1min If during the set
interval the StNo is attained, a new start is inhibited for the time tBst.
Reset time after trip : tBst = (1 - 60)min, step 1min.
Starting Sequence Control
During start-up of the motor, the unit can control an output contact used to operate the
switch-over of Reduced Voltage
motor starter (star-delta, resistance or impedance, autotransformers, etc.) to
automatically manage the starting transition:
Switch-over (transition) current: : Itr = (0.1-1)Ist, step 0.1Ist.
Maximum switch-over time delay: tTr = (0.5-50)s, step 0.1s.
At motor's start, counting of tTr begins. If during tTr the motor current drops below ITr,
switching-over is operated; if motor
current stays over ITr longer than tTr, the Locked Rotor element is activated.
Auto-setting
The complexity of properly set a motor protection, frequently produces undesired
tripping or non-operation of some of the data functions.
The relay MM30 automatically selects the best setting of the according to motor and
system basic data.
These parameters are: System frequency, Rated primary current of phase CTs, Rated
primary current of earth fault CT,
Motor rated current, Motor starting current, Starting time, Transition current level,
Transition time. Once these settings have been programmed the AUTOSET function can
be activated and all the variables are computed and automatically set at values suitable
for a normal duty of the motor. Variables can be anyhow manually modified if different
setting is needed.
Features:
Auto setting of parameters.
Draw out enclosure.
8 digit alpha numeric display.
Real Time Measurements.
Measurement and display of actual & trip data recordings.
8 LED’s for fault indication.
Control on number of starts of motor and Starting sequence control.
During start-up of the motor, the unit can control an output contact to automatically manage the starting transition.
RS485 port for communication with Modbus Protocol.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 9
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Motor Protection Relay (MPR300); These are Microprocessor based Motor protection relay. The relay has got
inbuilt CTs for motor sizes up to 50KW (i.e 88 A current). They provide the protection from Thermal Overload, Earth Fault,
Single Phasing, Locked Rotor, Under Current. Relay MPR300 is a three-phase motor protection relay for motor sizes up to 50KW
(max. 88 A current). It is a low cost solution, offering five major protections for motors widely used in fans, pumps, crushers,
mills, compressors, belt conveyors, centrifuges, mixers, ventilators, escalators, motorized valves etc. Major advantage is that it
provides E/F co-ordination in contactor-started motors, thus offering greater security, operator safety and economy. The relay is
micro controller based, highly user friendly and compact with inbuilt CTs. The relay can also be used for protection of larger
motors by using external CTs. medium voltage and high voltage sub-stations.
MPR300 has very few controls / settings on the front panel. There are two
potentiometers –one for setting the motor rated current and the other for setting
the E/F pick up level. A DIP switch is provided for selection of thermal overload trip
class and enable / disable of Locked rotor protection and under current protection.
Other settings are prefixed in the relay (some of them related to the trip class
selected). Six LEDs are provided –five to indicate the faults and one to indicate
power on condition. There are two push buttons- one to reset the LEDs on clearance
of fault and the other to test the relay. The test PB operation runs a small software
routine, which performers check on all software & hardware blocks internal to relay.
MOTOR PROTECTION RELAY (MPR300)
ITEM
MPR300 Mini Motor Protection Relay
MAKE
L&T
MODEL
MPR300
SIDE LABELS:
All data pertaining to pick up level and applicable time
delays are indicated on a label on right hand side of the
unit. The wiring diagram label is provided on the left
hand side of the unit.
SETTINGS:
*Motor Full load current Im
*E/F pick up level Io
*Trip time characteristic (Class 10A, 10, 20, 30)
*Enable / Disable Locked Rotor
The pick up levels and time delays for negative sequence,
locked rotor and under current protections are preset in
the relay.
RELAY CONNECTIONS
*R-Y-B phase wires pass through relay.
*Trip contacts to be wired to starter.
APPLICATIONS
MPR 300 offers you greater security, operator safety
through proper co-ordination in case of earth fault on
motor feeder.
MPR300 is used for protection of motors widely used in
fans, pumps, crushers, mills, compressors, belt conveyors,
centrifuges, mixers, ventilators, escalators, motorized
valves etc.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 10
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
TECHNICAL SPECIFICATIONS
Protections offered:
Thermal over load, Single Phasing, Earth fault, Locked rotor, Under current.
Thermal Over Load
Protection
*Current setting; 1 to 88 A in 6 different models.
1A to 2.75 A, 2A to 5.50 A, 4A to 11 A, 8A to 22 A, 16A to 44 A, 32A to 88 A.
Continuously adjustable.
*Trip Time Characteristics; Class 10A, 10, 20 and 30 as per IEC 947-4-1. Field
selectable through front DIP switches.
*Pre alarm; at 1.05 Im –by flashing LED (Im = Motor rated current)
*Thermal Memory: Provided.
Earth fault Protection
*Current setting: 10 to 50% of Im
(Field selectable by front panel control)
*Trip time delay: 200 msec (Factory set)
*Disable feature: Available
Phase Unbalance Protection
*Unbalance current : 40% of Im
*Trip time delay: 3 sec
(Both factory set)
Locked rotor protection
*Locked rotor current - 3 Im
*Trip time delay - 1 sec (Both factory set)
*Disable feature - Available
Under Current protection
*Under current threshold - 50% of Im
*Trip time delay - 3 sec (Both factory set)
*Disable feature - Available
Operational Indicators
*Indications for Power On: LED
*Indications for trip on each of the 5 faults
LED starts flashing when fault is detected.
Become steady on when the relay trips after the
preset time delay. LEDs are manual reset.
Contacts
*1 N/O + 1 N/C –manual reset
*Rated Voltage: 250 V AC / 30 V DC
*Rated Current: 5A
*Rated breaking capacity: 2000 VA / 240 W (Resistive)
Auxiliary power supply
240 V AC +/- 20% or 110V AC +/-20%
Operating Temperature
0 to 60 deg. C
Accuracy
As per IEC 947-4-1
Reference Standards
IEC 60255, IEC 61000 and IEC 60068
Please refer separate document
“ General Electrical Characteristics”
Over all dimensions
70mm W x 85 mm H x 106 mm D
Weight
Less than 400 gms
Features:
LED’s for trip indication.
Inbuilt CTs available.
4 selectable trip time curves for thermal overload.
Test facility through front push button.
Manual reset facility through front push button.
With / Without fail safe mode.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 11
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Motor Protection Relay (MM10); These Relay is a microprocessor based Motor Protection Relay with 4 digits LED
Display MM10 is a motor protection relay that combines thermal overload, short circuit, undercurrent, unbalance, phase loss,
phase sequence, lock/stall rotor and earth fault protections. These incorporates a 4-digit LED indicator which allows direct
numerical readout of set values, actual measured value and system indication. MM10 has 2 relay outputs (R1 and R2). R1 is On
under normal operating condition to allow motor running, and off during tripping. R2 is programmable to give signal in various
conditions. A programmable binary input is provided to perform various operations upon binary input triggering.
MOTOR PROTECTION RELAY (MM10)
ITEM
Compact Motor Protection Relay
MAKE
L&T
MODEL
MM10
SIDE LABELS
All data pertaining to pick up level and applicable time delays
are indicated on a label on right hand side of the unit. The
wiring diagram label is provided on the left hand side of the
unit.
Display
Current and Thermal Capacity Display: During power up,
when the relay is not under tripping condition, the display
shows current in ampere or thermal capacity %. The Function
LED indicates which parameter is being displayed. The Data
LED showing value.
Press “UP” or “DOWN” to scroll through the parameters.
Auto Scroll: When auto scroll is enabled, the display scrolls
between currents and thermal reading every 10 seconds. To
toggle auto scroll mode, press "UP" and "DOWN"
simultaneously
*LED Display: i) Run LED -Run LED shows the motor status.
Refer to 3.2.1 Motor Starting.
Off - Motor stopping,
Blink - Motor starting,
On - Motor running
*Trip LED: Trip LED is normally off. During tripping pickup,
where tripping delay is counting down, Trip LED blinks. Trip
LED on during tripping.
Off - Normal
Blink - Pickup
On - Tripping
*Thermal LED: Thermal LED blinks when motor current is
more than 105% of IB. Thermal LED on during thermal
overload tripping, and when thermal capacity is more than
40% after overload tripping (in which R1 is off, motor not
allowed to start).
Off - Normal
Blink - Thermal overload warning
On - Thermal overload tripping, Thermal capacity high, R1 off.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:[e-mail]
PAGE. 12
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Features:
4 Digit LED display
Measurement of RYB, Zero Sequence current and Thermal capacity.
Separate LED’s for indication of Motor operational, Trip & Thermal OL/ pre-alarm status.
Programmable thermal OL time constant right from 1 sec to 40 sec.
2 nos. of C/O output contacts.
1 no. Programmable Binary input for remote operation.
It can be configured for either of these operations:
Inhibit Motor Start
Trip Reset
Instant Tripping
Relay testing facility
Trip data recording
Fault current or cause of last trip is displayed.
Setting Display
When the relay is not under tripping condition, pressing
"RESET/MODE" will scroll through various settings.
Function LED showing number or alphabet to indicate
which setting is being view as shown in Figure 3. Table 1
gives description of each setting.
APPLICATIONS
MPR 300 offers you greater security, operator safety through
proper co-ordination in case of earth fault on motor feeder.
MPR300 is used for protection of motors widely used in fans,
pumps, crushers, mills, compressors, belt conveyors,
centrifuges, mixers, ventilators, escalators, motorized valves
etc.
Tip: To quickly jump back to current/thermal display
during setting display, press and hold "RESET/MODE"
for 1.5 second
PROGRAMMING
SETTING
Step 1: Press "RESET/MODE" until the Function LED shows
the required setting.
Step 2: Press "UP" and "DOWN" simultaneously to enter
programming mode.
The Function LED blinks to indicate the relay is in
programming mode.
Step 3: Press "UP" or "DOWN" to change the value.
Step 4: To save the new value, press "UP" and "DOWN"
simultaneously again. Programming mode exits,
function LED stop blinking.
To exit programming mode without saving, press
"RESET/MODE" once.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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PAGE. 13
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
TRANSFORMER RELAY
Transformer Differntial Relay (MD32TM); These are three-phase percentage biased differential protection relay
for 2 winding transformers or 3 winding with only one source of supply. The relay measures the incoming currents and operates
the CT ratio and Power Transformer vector group compensation without the need of using interposing CTs.
TRANSFORMER DIFFERNTIAL RELAY (MD32TM)
Item
Transformer Differential Relay (MD32-TM)
Make
L&T
Model
MD32-TM
Real Time
Measurements
IdA-IdB-IdC-Ido - I1A-I1B-I1C - I2A-I2B-I2C - IdIIA-IdIIB-
IdIIC - IdVA-IdVB-IdVC
Maximum Demand
and Inrush Recording
IdA-IdB-IdC-Ido - I1A-I1B-I1C - I2A-I2B-I2C - IdIIA-IdIIB-
IdIIC - IdVA-IdVB-IdVC
Programmable Input
Quantities
Fn = System frequency : (50 - 60)Hz
1In = Rated primary current of phase CTs HV side : (1 - 9999)
A, step 1A
2In = Rated primary current of phase CTs LV side : (1 - 9999)
A, step 1A
1V = Rated primary voltage of Transformer HV side : (0.2 -
380)kV, step 0.01kV
2V = Rated primary voltage of Transformer LV side : (0.2 -
380)kV, step 0.01kV
a= Selection of Transformer's vector group.
F87T : Low-set Phase
Differential
Current setting range : d> = (0.1 - 0.5)In, step 0.01In
Instantaneous output : £ 0.03s
Bias percentage : R = (10 - 50)%, step 1%
2 Harmonic restraint level : 2H = (0.1 - 0.3)Id, step 0.01Id
5 Harmonic restraint level : 5H = (0.2 - 0.4)Id, step 0.01Id
Time during which harmonic restraint level can be lowered at
transformer energisation: tH = (0.05 - 90)s, step 0.01s
2 Harmonic restraint level reduction during tH : R2H = (0.5 -
1)2H, step 0.01
5 Harmonic restraint level reduction during tH : R5H = (0.5 -
1)5H, step 0.01

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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PAGE. 14
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Features;
Automatic correction of CTs’ mismatch and Transformer Vector Group.
Two differential current levels.
2nd and 5th harmonic adjustable restraint levels.
Programmable percentage bias curve.
Oscillographic recording.
Modbus Communication Protocol.
Maximum Demand & Inrush Recording.
F87T : High-set Phase
Differential
Current setting range : d>> = (2 - 20)In, step 0.01In
Detection time: 6ms < t < 20ms
Peak current detection with DC offset restraint.
Digital Inputs
B1 = Operation block input
B2 = Harmonic restraint's reduction
B3 = Oscillographic record external trigger
Approval: CE
Reference Standards
Dielectric test voltage- IEC 60255-5
Impulse test voltage - IEC 60255-5
Insulation resistance - >100 M
Characteristics
Accuracy at reference value of influencing factors :
2% In for measurement and 2% +/- 10ms for times.
Rated Current: In = 1 or 5A
Current overload : 200 A for 1 sec; 10A continuos
Burden on current inputs : Phase : 0.01VA at In = 1A; 0.2VA
at In = 5A and Neutral : 0.015VA at In = 1A ; 0.35VA at In = 5A.
Average power supply consumption: 8.5 VA
Output relays : Rating 5 A; Vn = 380 V
A.C. resistive switching = 1100W (380V max)
make = 30 A (peak) 0.5 sec.
break = 0.3 A, 110 Vcc,
L/R = 40 ms (100.000 op.)

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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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.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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PAGE. 16
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
VOLTAGE & FREQUENCY RELAY
Voltage & Frequency Relay (MC3V); These are three-phase voltage relay, suitable for protection of HV, MV, LV
power transmission and distribution systems. The relay MC3V measures the true R.M.S. value of the 3 phase to neutral voltages
fed to three transformers isolated high-impedance inputs.
VOLTAGE & FREQUENCY RELAY (MC3V);
Item
VOLTAGE & FREQUENCY RELAY
Make
L&T
Model
MC3V
Real Time Measurements
f - EA - EB - EC - Vo - V1 - V2
Programmable Input
Quantities
Fn = System frequency : (50 - 60)Hz
V1 = Rated primary phase to phase voltage of system's Pt :
(0.05 - 500)kV, step 0.01kV.
V2 = Rated secondary phase to phase voltage of system's Pts :
(50 - 400)V, step 0.01V.
F59 (V>) : First
OverVoltage Element
Function enabling : = Enable - Disable
Setting range : V> = (0.5 - 1.50)Vn, step 0.01Vn
Instantaneous output : £ 0.03s
Trip time delay : tV> = (0.05 - 60)s, step 0.01s
F59 (V>>) : Second
OverVoltage Element
Function enabling : = Enable - Disable
Setting range : V>> = (0.5 - 1.50)Vn, step 0.01Vn
Instantaneous output : £ 0.03s
Trip time delay : tV>>= (0.05 - 60)s, step 0.01s
F27 (V<) : First
UnderVoltage Element
Function enabling : = Enable - Disable
Setting range : V< = (0.2 - 1.20)Vn, step 0.01Vn
Instantaneous output : £ 0.03s
Trip time delay : tV< = (0.05 - 60)s, step 0.01s
F27 (V<) : Second Under
Voltage Element
Function enabling : = Enable - Disable
Setting range : V<< = (0.2 - 1.20)Vn, step 0.01Vn
Instantaneous output : £ 0.03s
Trip time delay : tV<< = (0.05 - 60)s, step 0.01s
81> (f>): Maximum
Frequency Element
Function enabling : = Enable - Disable
Setting range : f> = (40 - 70)Hz, step 0.01Hz
Instantaneous output : = £ 0.03s
Trip time delay : tf> = (0.05 - 60)s, step 0.01s
81< (f<): Minimum
Frequency Element
Function enabling : = Enable - Disable
Setting range : f< = (40 - 70)Hz, step 0.01Hz
Instantaneous output : = £ 0.03s
Trip time delay : tf< = (0.05 - 60)s, step 0.01s
1-59o (Vo>): Zero
Sequence Voltage Control
Function enabling : = Enable - Disable
Setting range : Vo> = (0.1 - 2)Vn, step 0.01Vn

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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PAGE. 17
REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TM
TM
Features;
Zero Sequence voltage protection
LCD 16 (2x8) characters display
Over / Under voltage protection
Over / Under frequency protection
Positive / negative sequence voltage protection
Time tagged multiple event recording
Oscillographic wave form capture
Modbus RTU / IEC870-5-103 Communication Protocol
Element
Instantaneous output : = £ 0.03s
Trip time delay : tVo> = (0.05 - 60)s, step 0.01s
1-27 (V1<): Positive
Sequence Undervoltage
Element
Function enabling : = Enable - Disable
Setting range : V1< = (0.02 - 1.5)Vn, step 0.01Vn
Instantaneous output : = £ 0.03s
Trip time delay : tV1<= (0.05 - 60)s, step 0.01s
1 - 47 (V2>): Negative
Sequence (Unbalanced)
Overvoltage Element
Function enabling : = Enable - Disable
Setting range : V2> = (0.1 - 1.5)Vn, step 0.01Vn
Instantaneous output : = £ 0.03s
Trip time delay : tV2<= (0.05 - 60)s, step 0.01s
Characteristics
Accuracy at reference value of influencing factors:
2% Un (for measurements)
2% + (to=20-30ms) (for times)
Rated Voltage: Un = (50 - 400)Vac phase to phase.
Voltage Overload: 2Un for 1sec
Burden on voltage input: 0.2 VA/phase at Un
Average power supply consumption : <7 VA
Output relays: A.C. resistive switching = 1500W (400V max)
make = 30 A (peak) 0.5 sec.
break = 0.3 A, 110 Vcc,
L/R = 40 ms (100.000 op.)
Power Supply
Type 1 : 24 ¸ 110V A.C.(±20%) - 24 ¸ 125V D.C. (±20%)
Type 2 : 80 ¸ 220V A.C.(±20%) - 90 ¸ 250V D.C. (±20%)
Accessories
*Two Under Voltage elements.
*Two Over Voltage elements.
*One Under Frequency element.
*One OverFrequency element.
*One Zero Sequence Overvoltage Element.
*One Negative Sequence Overvoltage Element.
*One Positive Sequence Undervoltage Element
*Time tagged multiple event recording.
*Oscillographic wave form capture
*Modbus RTU / IEC870-5-103 Communication Protocols
*Display LCD 16 (2x8) characters.

AUMSHIVAY ENGINEERING PRIVATE LIMITED
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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