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MiCOM P211 The MiCOM P211 relay is made for motor
application. It is designed to offer a wider range of
functions related to protection, supervision and
control of motors.
Thanks to its favorable "price vs technical features"
ratio, P211 can be used both in medium voltage
and in low voltage applications (specifically where
communication facilities are required).
MiCOM P211 relay provides features for easy
adaptation to different applications and operation
conditions.
The setting software MiCOM S1 allows users an
easy configuration and access to all
measurements.
Modbus RTU communication protocol allows
interfacing substation control or SCADA system.
This MiCOM relay is housed in a small case for rail
mounting (panel) or rack mounting
Customer Benefits
Flexible motor
protection relay
Optimizes the motor's
thermal image
monitoring
Good feature/price ratio
T&D
MiCOM P211
Motor Protection Relay
P R OT E C T I O N
P211 Flush
P211 Rail APPLICATION
The MiCOM P211 provides a wide range of protection
functions for an asynchronous motor.
Typical applications are:
>
MV Industry, Transport
>
A</b>dvanced LV application (specifically where
communication facilities are required)
>
Simple LV application
To have good ratio: price to functionality used in the
application, there are different models of P211
available.
Differences between models are shown in the Table
below
GLOBAL FUNCTIONS
.
The following functions are generally available in all
devices (see table below) :
>
True RMS phase current value measurement
within a frequency range from 10Hz to 1000Hz
>
Earthfault current value measurement within
a frequency range from 40Hz to 70Hz
>
35 mm DIN rail or flush mounted case (option)
>
4 digit LED display
>
5 button keypad to input settings and configure
the relay
>
Fault record for the 3 most recent trips
>
Direct connection of phase currents up to 80A
nominal current of the motor in LV application
(rail mounting case)
2>3
P211 offers scalable solutions
to suit precise needs
FUNCTIONS OVERVIEW
Models
A
B
C
50/51
Short circuit (DT) 50N/51N
Earth fault overcurrent Io> (DT)
66
Number of starts limitation 37
Loss of load/undercurrent Loss of phase 46
Unbalance (asymmetry) 49
Thermal overload 48/51LR
Start/Stalled protection 51S
Locked rotor during starting 14
Speed switch input 38
PTC input CB or contactor control; Local (via input) / Remote
Restart of motor logic (caused by drop of voltage) Star / delta logic control 86
Output relay latching Measurements Fault records (3 most recent) Binary inputs/outputs relays 2/2 2/2 4/4
AC current/voltage inputs 3/0 4/0 4/0
Modbus RTU (rear port RS485)
Setting software MiCOM S1 (rear port RS485) MAIN FUNCTIONS
The relays of these ranges are compromised of full
suite of protection functions and auxiliaries; each
function can be individually configured or disabled to
suit any particular application.
The available functions, including protection, inputs
and outputs are easily programmable by means of
user friendly front panel interface and the S1 software
interface.
The 4 digit LED display provides the user with key
information (faults, measurements, settings etc.).
The menus have a pull-down structure for easy use
and quick access to any data
I

>
>
>


Communication
Measurement
Up to 4 binary outputs
Up to 4 digital inputs
Conventional
signalling
PTC
sensor
Speed
switch
I>>
50/51
RS485 port
to setting software S1
to SCADA systems
REAR
PORT
I >
50N/51N
0
I <
37
66
46
86
49
14
PTC
38
48/51
LR
51S
Fault records
3
FUNCTIONAL OVERVIEW
MiCOM P211
provide simple solution
for your specific application.
(Description of ANSI code nos. see Functions Overview) 4>5
>
Thermal Overload (49)
The protection feature is based on mathematical
model of motor thermal image. The model utilises
heating constant time values. It is input to the relay by
means of T6xIB parameter, which describes the
maximum period of time when actual motor current
value is allowed to reach a sixfold increase of its
nominal value. Cooling constant time value is
calculated on the basis of the heating constant.
Configuring procedure of the model includes setting of
the motor base current (nominal motor current) and
T
6xIB
.
Alarm and trip stages can be selected.
It is possible to set a separate, which is activated after
trip command, and up to this threshold the trip signal is
present. This feature prevents from close command if
motor is overheated.
>
Start / Stall ProtectionN (48/51LR)
The monitor the starting sequence of the motor, the
MiCOM P211 relay provides excessive start time
protection / locked rotor protection.
The detection of the start-up is based on current
criteria only. If start-up phase is too long (greater than
set time delay) there is trip command or alarm signal.
If the starting of motor is finished, start protection is
blocked.
During normal motor operation, an overcurrent
threshold detects rotor stalling, and the shorter (than
for starting) time delay is used. The normal motor
operation, after starting, is detected by watching
current stages.
FUNCTIONS
>
Short Circuit (50/51)
The stage with definite time delay protects against
phase short circuit faults, which are responsible of
overheating damages.
>
Earth Fault Overcurrent Protection (50N/51N)
(models: B and C only)
The earth fault current, which can appear following a
stator earth fault, can be detected by non-directional
overcurrent protection element using earth current
measured from a sensitive current input.
Each stage and related time delay can be programmed
to provide maximum selectivity.
Protection element can be configured to make a trip or
alarm.
The range of settings can be selected by ordering
code.
>
Number of Starts (66)
Starts are supervised during a settable period.
>
Loss of Load/Undercurrent (66)
The current stage, along with a pick-up time delay, is
used to detect a loss of load due to a shaft failure or a
pump running unprimed.
>
Loss of Phase
This feature monitors phase current values. Any phase
current of a value below setable current stage is
recognised by the relay as a lost phase.
The relay trips a motor after a set time delay (DT).
>
Unbalance (46)
Running motors at unbalance conditions results in
overheating, even at current values below the nominal.
Principle of operation is based on monitoring of the
percentage of the current unbalance in the three
subsequent phases.
Proven protection
as safe, simple and versatile
as your application needs. >
Locked Rotor during Starting (51S)
During motor start-up, a locked rotor is detected with
the help of a speed switch signal, connected via the
logic input. If during start-up phase input is not shorted
(it means that the motor is stopped) the shorter time
delay (than starting time) setting is used.
This protection can be set to trip or alarm.
>
Input for PTC Sensors (38)
If T1-T2 input is configured as PTC input and
resistance of the sensors' loop connected to input : T1-
T2 increase, then protection operates instantaneously.
Up to 6 PTC sensors can be connected in series.
The PTC input operates instantaneously.
This function can be configured to make a trip or alarm.
>
External Protection Trip
The external protection trip operates if an input state,
which is programmed to this function, changes its state.
Trip operation is instantaneous
A2
A1
13 14 23 24
T1 T2
S 1 S2
L3
L1
L2
Vx
K
L
33 34
44 42
41
V2
V1
C
+
-
RS 485
Optional
I / O card
(version C)
Binary
inputs
Binary
input
Input
Io
P1 P2
P3 P4
Op tion
(version B or C)
A2
A1
13 14 23 24
T1 T 2
S 1 S2
Vx
K
L
33 34
44 42
41
V2
V1
C
+
-
Binary
inputs
P1 P2
P3 P 4
1
2
3
4
5
6
IL1 IL2
IL3
35 mm DIN rail case
Flush mounted case
Binary/PT C
input
RS 485
Binary
input
Input
Io
Binary/PT C
input
Optional
I / O card
(version C)
Option
(version B or C-
>
Restart of Motor Logic
This function is used for the motors' selfstarting.
If there is no voltage on the busbar (controlled via logic
input) this function is triggered.