Alstom MiCOM P125 User manual

Technical Guide P12y/EN FT/D22
MiCOM P125/P126/P127
User Guide

Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 1/108
CONTENTS
1. INTRODUCTION 3
2. PASSWORD 4
2.1 Password Protection 4
2.2 Password Entry 4
2.3 Changing the Password 4
2.4 Displays of Alarm & Warning Messages 4
2.4.1 Electrical Network Alarms 4
2.4.2 Relay Hardware or Software Warning Messages 5
3. GENERAL CHARACTERISITCS 9
3.1 Analogue Inputs 9
4. MENU 11
4.1 Menu OP PARAMETERS 11
4.1.1 Additional OP PARAMETERS Menu Points for P126 & P127 13
4.2 Menu CONFIGURATION 13
4.2.1 Submenu General Options 13
4.2.2 Submenu Transfo. Ratio 14
4.2.3 Submenus to Configure LEDs 5 to 8 15
4.2.4 Example: Setting LED 5 for P126: 19
4.2.5 Submenu Logic Inputs Choice: Active High/Low (P125) 23
4.2.6 Submenu Logic Inputs Choice: Active High/Low (P126 & P127) 23
4.2.7 Submenu Output Relay 1 in Fail Safe mode 24
4.2.8 Submenu Selecting Active Protection Group (P125, P126 & P127) 25
4.3 Menu MEASUREMENTS 27
4.3.1 Menu MEASUREMENTS for P125 28
4.3.2 MEASUREMENTS Menu Points for P126 28
4.3.3 Additional Measurements Menu Points for P127 31
4.4 Menu COMMUNICATION 35
4.4.1 Menu ModBus COMMUNICATION 35
4.4.2 Menu Courier COMMUNICATION 36
4.4.3 Menu IEC 60870-5-103 COMMUNICATION 36
4.4.4 Menu DNP3.0 COMMUNICATION 36

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Page 2/108 MiCOM P125/P126/P127
4.5 Menu PROTECTION 37
4.5.1 Submenu [67/50/51] Directional Three Phase Overcurrent (P127) 38
4.5.2 Submenu [67N/50N/51N] Directional Earth Overcurrent 44
4.5.3 Submenu [50/51] Three Phase Overcurrent (P126) 51
4.5.4 Submenu [32N] Earth Wattmetric Protection 56
4.5.5 Submenu [46] Negative Phase Sequence Overcurrent (P126 & P127) 60
4.5.6 Submenu [49] Thermal Replica Overload (P126 & P127) 63
4.5.7 Submenu [37] Undercurrent Protection (P126 & P127) 65
4.5.8 Submenu [59] Overvoltage Protection (P127) 66
4.5.9 Submenu [27] Undervoltage Protection (P127) 67
4.5.10 Submenu [59N] Earth Overvoltage Protection 68
4.5.11 Submenu [79] AUTORECLOSE (P126 & P127) 68
4.6 Menu AUTOMAT. CTRL 71
4.6.1 Submenu Trip Commands 71
4.6.2 Submenu Latch Relays 75
4.6.3 Submenu Blocking Logic 76
4.6.4 Submenu Logic Select 79
4.6.5 Submenu Outputs Relays 79
4.6.6 Submenu Inputs 89
4.6.7 Submenu Inputs (P126 & P127) 90
4.6.8 Submenu Broken Conductor (P126 & P127) 91
4.6.9 Submenu Cold Load PU (P126 & P127) 92
4.6.10 Submenu Circuit Breaker Fail (P126 & P127) 93
4.6.11 Submenu Circuit Breaker Supervision (P126 & P127) 94
4.7 Menu RECORDS (P126 & P127) 102
4.7.1 Submenu CB Monitoring (P126 & P127) 102
4.7.2 Submenu Disturb Record 105
5. WIRING 106
5.1 Auxiliary Power Supply 106
5.2 Current Measurement Inputs 106
5.3 Logic Inputs 106
5.4 Output Relays 107
5.5 Communication 107
5.5.1 RS485 Rear Communication Port 107
5.5.2 RS232 Front Communication Port 107

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User Guide
MiCOM P125/P126/P127 Page 3/108
1. INTRODUCTION
MiCOM P125, P126 & P127 are fully numerical relays designed to perform electrical
protection and control functions.
The following sections describe content and structure of the menu.
The five keys situated in the middle of the MiCOM relay front panel are dedicated to
set parameters.
With the keys 8246it is possible to move in the direction indicated to the various
levels of the menus.
The key 5validates a choice or value (modification of settings).
The two keys 0and 1are dedicated to acknowledging/clearing and
displaying/reading of data. For example if successive alarms are to be displayed,
press on key 1.
The alarms are presented in reverse order of their detection (the most recent alarm
first, the oldest last). The user can either acknowledge and clear each alarm from the
LCD by using 0or go to the end of the ALARM menu and carry out a general
acknowledgement.

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Page 4/108 MiCOM P125/P126/P127
2. PASSWORD
2.1 Password Protection
Password protection is applicable to most of the relay settings, especially to the
selection of the various alarm thresholds, trip thresholds, communication parameters,
allocation of logic inputs and outputs.
The password consists of four capital characters. When leaving the factory, the
password is set to AAAA. The user can define any combination of four characters.
Should the password be lost or forgotten, modification of the stored parameters is
blocked. It is then necessary to contact the manufacturer or his agent and a stand-by
password specific to the relay concerned may be obtained.
The programming mode is indicated with the letter "P" on the right hand side of the
display on each menu heading. The letter "P" remains present as long as the
password is active (5 minutes if there is no action on the keypad).
2.2 Password Entry
The input of the password is requested as soon as a modification of a parameter is
made for any one of the six/eight menus and the submenus. The user enters each of
the 4 characters and then validates the entire password with 5.
After 5 seconds, the display returns to the point of the preceding menu.
If no key is pressed inside of 5 minutes, the password is deactivated. A new password
request is associated with any subsequent parameter modification.
2.3 Changing the Password
To change an active password, go to the OP. PARAMETERS menu and then to the
Password submenu. Enter the current password and validate. Then press 5and enter
the new password character by character and validate the new password using 5.
The message NEW PASSWORD OK is displayed to indicate that the new password
has been accepted.
2.4 Displays of Alarm & Warning Messages
Alarm messages are displayed directly on the front panel LCD. They have priority
over the default current value. As soon as an alarm situation is detected by the relay
(threshold crossing for example), the associated message is displayed on the MiCOM
relay front panel LCD and the LED Alarm (LED 2) lights up.
The alarm and warning messages are classed as follows:
Alarm messages generated by the electrical power network.
Warning messages caused by hardware or software faults from the relay.
2.4.1 Electrical Network Alarms
Any crossing of a threshold (instantaneous or time delay) generates an "electrical
network alarm". The involved threshold is indicated. Regarding the phase thresholds,
the phase designation (A, B or C) is also displayed.
If several alarms are triggered, they are all stored in their order of appearance and
presented on the LCD in reverse order of their detection (the most recent alarm first,
the oldest alarm last). Each alarm message is numbered and the total stored is
shown.
The user can read all the alarm messages by using 1.

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User Guide
MiCOM P125/P126/P127 Page 5/108
The user acknowledges and clears the alarm messages from the LCD by using 0.
The user can acknowledge each alarm message one by one or all by going to the
end of the list to acknowledge, and clear, all the alarm messages by using 0.
The control of the ALARM LED (LED 2) is directly assigned to the status of the alarm
messages stored in the memory.
If one or several messages are NOT READ and NOT ACKNOWLEDGED, the ALARM
LED (LED 2) flashes.
If all the messages have been READ but NOT ACKNOWLEDGED, the ALARM LED
(LED 2) lights up continuously.
If all the messages have been ACKNOWLEDGED, and cleared, if the cause was
reset,, the ALARM LED (LED 2) is extinguished.
2.4.2 Relay Hardware or Software Warning Messages
Any software or hardware fault of the MiCOM relay generates a "hardware/software
alarm" that is stored in memory as a "Hardware Alarm". If several hardware alarms
are acquired they are all stored in their order of appearance. The warning messages
are presented on the LCD in reverse order of their detection (the most recent first and
the oldest last). Each warning message is numbered and the total stored is shown.
The user can read all warning messages by using 1, without entering the password.
The acknowledgement, and clearing, of warning messages caused by internal relay
hardware or software faults is not possible. A warning message can only be made to
disappear if the cause of the fault has been removed.
The control of the WARNING LED (LED 3) is directly assigned to the status of the
warning messages stored in the memory.
If the internal hardware or software fault is major (i.e. the relay cannot perform
protection functions), the WARNING LED (LED 3) lights up continuously.
If the internal hardware or software fault is minor (i.e. a communication failure that
has no influence on the protection and automation functions), the WARNING LED
(LED 3) will flash.
Warning messages caused by internal hardware or software faults are:
<<COMM.ERROR>> : Communications faulty
<<EEPROM ERROR DATA>> : Settings corrupted
<<EEPROM ERROR CALIBR.>> : Calibration failure
<<CT ERROR>> : Analogue channel in fault

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Page 6/108 MiCOM P125/P126/P127
Possible software alarm messages are:
tI> instantaneous 1st threshold directional/non directional
overcurrent
tI> time delayed 1st threshold directional/non directional overcurrent
For the I> and tI> a particular attention has to be taken.
The P126 & P127 are able to identify the phase where the fault occurs, and the
relevant alarm messages are shown in the below listed table.
Menu’ ALARMS
I> PHASE tI> PHASE
A
A
A
A
B
B
B
B
C
C
C
C
A
A
A
A
AB
AB
A
A
A
A
AB
ABC
A
A
A
ABC
ABC
ABC
ABC
ABC
ABC
ABC
I>> 2nd alarm threshold directional/non directional overcurrent
I>>> 3rd alarm threshold directional/non directional overcurrent
tI> 1st trip threshold directional/non directional overcurrent
tI>> 2nd trip threshold directional/non directional overcurrent
tI>>> 3rd trip threshold directional/non directional overcurrent
Ie> 1st alarm threshold directional/non directional earth fault
Ie>> 2nd alarm threshold directional/non directional earth fault
Ie>>> 3rd alarm threshold directional/non directional earth fault
tIe> 1st trip threshold directional/non directional earth fault
tIe>> 2nd trip threshold directional/non directional earth fault
tIe>>> 3rd trip threshold directional/non directional earth fault
Pe/IeCos> 1st alarm threshold wattmetric/IeCos earth fault

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User Guide
MiCOM P125/P126/P127 Page 7/108
Pe/IeCos>> 2nd alarm threshold wattmetric/IeCos earth fault
tPe/IeCos> 1st trip threshold wattmetric/IeCos earth fault
tPe/IeCos>> 2nd trip threshold wattmetric/IeCos earth fault
Thermal Alarm threshold thermal alarm
Thermal Overload thermal overload trip
I< alarm threshold undercurrent fault
tI< trip threshold undercurrent fault
I2> 1st alarm threshold negative sequence overcurrent
tI2> 1st trip threshold negative sequence overcurrent
I2>> 2nd alarm threshold negative sequence overcurrent
tI2>> 2nd trip threshold negative sequence current
I2>>> 3rd alarm threshold negative sequence current
tI2>>> 3rd trip threshold negative sequence current
Brkn.Cond. broken conductor signal. I2/I1 element threshold exceeded for
longer than tBC; tBC is settable in the AUTOMAT. CTRL/Broken
Conductor menu.
U> 1st alarm threshold overvoltage
U>> 2nd alarm threshold overvoltage
tU> 1st trip threshold overvoltage
tU>> 2nd trip threshold overvoltage
U< 1st alarm threshold undervoltage
U<< 2nd alarm threshold undervoltage
t U< 1st trip threshold undervoltage
t U<< 2nd trip threshold undervoltage
Ue>>>> alarm threshold residual overvoltage
tUe>>>> trip threshold residual overvoltage
tAUX 1 timer t AUX1 associated with logic input Aux1
tAUX 2 timer t AUX2 associated with logic input Aux2
CB Fail circuit breaker failure signal; the CB does not trip on tBF
(time-out). tBF is settable in the AUTOMAT. CTRL/CB Fail
menu.
SF6 Low faulty circuit breaker signal at assignable logic input
(set in AUTOMAT. CTRL/Inputs menu).
Toperat operating (or tripping) time of the circuit breaker longer than
the value set in the AUTOMAT. CTRL/CB Supervision menu.
CB Open NB number of circuit breaker operation higher that the value set
in the AUTOMAT. CTRL/CB Supervision menu.
SAmps(n) total measured current broken by CB is higher than the value set
in AUTOMAT. CTRL/CB Supervision menu.

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Trip Circ circuit breaker trip circuit failure for longer than the supervision
timer tSUP; set in the AUTOMAT. CTRL/CB Supervision menu.
LATCHED RELAYS at least one output relay is latched.
Recloser Successful successful re-close signal. Indicates that the fault has been
cleared upon circuit breaker re-closure, and has not re-
appeared before expiry of the reclaim time.
Recloser Blocked re-close blocking signal. Generated by:
– external breaker failure signal (ex. SF6 low).
– signal provided via logic input assigned to the
CB Fail function in the AUTOMAT. CTRL/Inputs menu.
– external blocking signal. External blocking can be set
by the user in the PROTECTION G1 / [79]
AUTORECLOSE/Ext Block menu. This blocking signal
is provided via a logic input assigned to the Block_79
function in the AUTOMAT. CTRL/Inputs menu.
– definitive trip.
– breaker operating time (or tripping time) longer than the
set time, but only if the function is enabled.
Recloser Conflict configuration conflict of the re-close function. This signal
is generated by:
– None digital input assigned to the position of the CB 52a
– no output relay assigned to the CB Close function
(AUTOMAT. CTRL/Output Relays menu ).
– None protection is assigned to the trip command
– no re-close cycle assigned to the protection functions
(PROTECTION G1/ [79] Autoreclose menu ).
EQU. A Equation logic A set
EQU. B Equation logic B set
EQU. C Equation logic C set
EQU. D Equation logic D set

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User Guide
MiCOM P125/P126/P127 Page 9/108
3. GENERAL CHARACTERISITCS
3.1 Analogue Inputs
The analogue inputs for each relay are shown in the following table:
Type of Analogue Inputs MiCOM
P125
MiCOM
P126
MiCOM
P127
Phase current inputs 3 3
Earth current inputs (high, medium,
low sensitivity by Cortec code) 1 1 1
Residual voltage input 1 1 1/0
Phase to neutral or phase to phase
voltage inputs 2/3
Total analogue inputs 2 5 7
Following is a description of the voltage inputs connection for the P127 relay.
Case A
2 phase to neutral voltage inputs
1 residual voltage input
VC is then calculated as VC= VA+ VB + Ve
To obtain a correct reading of the input voltage the exact voltage transformer ratio
for Ve has to be set.
Case B
2 phase to phase voltage inputs
VCA is then calculated as VCA= VAB + VBC
Case C
3 phase to phase voltage inputs
No residual voltage input
Ve can be calculated as Ve = (VA+ VB+ VC )/3
·On the MiCOM P125 relays rear terminals there is one current input rated 1A
and one current input rated 5A available and one voltage input. On the MiCOM
P126 relay rear terminals there are four current inputs rated 1A and four current
inputs rated 5A available and one voltage input. On the MiCOM P127 relay rear
terminals there are four current inputs rated 1A and four current inputs rated 5A
available and three voltages input.
·By using the Cortec code (see the appropriate section) the user can choose the
voltage range for voltage inputs for the MiCOM P125 & P126 (one input) and
P127 (three inputs).
All logic outputs can be programmed to respond to any of the available control or
protection functions. Logic inputs can be assigned to various control functions.
All logic digital inputs can be programmed to respond to any of the available control
or protection functions. Their supply level is the same as the power supply selected of
the relay by Cortec. They can be supplied in A.C or D.C current by Cortec choice.

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The MiCOM relays are powered either from a DC (3 voltage ranges) or an AC
auxiliary power supply.
Any short time voltage interruption (<50ms) is filtered and regulated through the
auxiliary power supply.
The front panel enables the user to navigate through the menu to access data,
change settings, read measurements etc.
Eight LEDs on the front panel allow a clear and simple presentation of events. The
various detected alarms are stored and can be displayed on the back-lit LCD.
No Password is required to read and acknowledge (clear) these alarm messages.
On their rear terminals the MiCOM P125, P126 & P127 relays have a standard
RS485 port available. The user can choose, by ordering, the communication protocol
ModBus RTU, IEC 60870-5-103, Courier (when available), or DNP3 (when
available).
Using the communication channel RS485, all stored information (measurements,
alarms, and parameters) can be read and the settings can be modified if this
functionality is allowed by the chosen protocol.
Evaluation and modification of this data can be carried out on site with a normal PC
and the appropriate ALSTOM software.
RS485 based communication allows MiCOM P125, P126 & P127 relays to be directly
linked to a digital control system (e.g. MiCOM S10).
All the available data is then placed at the disposal of the supervisor and can be
processed either local or remotely.

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User Guide
MiCOM P125/P126/P127 Page 11/108
4. MENU
The menu of the MiCOM P125, P126 & P127 relays is organised into main menus
and submenus. The available content depends on the MiCOM model.
The menu for the MiCOM P125 relay is divided into 7 sections and for the MiCOM
P126 & P127 relays into 8 sections:
ÞOP PARAMETERS
ÞCONFIGURATION
ÞMEASUREMENTS
ÞCOMMUNICATION
ÞPROTECTION G1 / G2
ÞAUTOMAT. CTRL
ÞRECORDS (P126 & P127 only)
To access these menus from the default display press 2.
To return to the default display from these menus or submenus press 8.
4.1 Menu OP PARAMETERS
To gain access to the OP PARAMETERS menu from the default display, press 2.
OP PARAMETERS
Heading of OP PARAMETERS menu.
To gain access to the menu content, press 2.
Password
* * * *
Entry of the password to be able to modify the MiCOM
relay settings and parameters.
To enter the password, press 5.
Password
AAAA
The password entry is made letter by letter, using 2or
8to go up or down in the alphabet. After each letter,
press 6to enter the following letter. At the end press 5
to validate the password. If the password is correct, the
following message is displayed on the LCD:
PASSWORD OK.
Note: The password is initially set in the factory to
AAAA.
WARNING : AS SOON AS THE PASSWORD HAS BEEN ENTERED, NO SETTING CHANGE
BY THE REMOTE/LOCAL COMMUNICATION (RS485 OR RS232) WILL BE
ACCEPTED.

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Description
P125-2
Indicate the type of relay, the near number is the
sensitivity for the earth input circuit.
0: from 0.1 to 40 Ien
1: from 0.01 to 8 Ien
2: 0.002 to 1 Ien
Reference
ALST
Displays the reference number that lists the equipment
associated with the relay.
The entry of the reference is made character by
character using 28. After each character (letter,
number or sign), press 6to enter the following
character. Press 5to validate the reference entry.
Note: The reference is initially set in the factory to
ALST.
Software Version
4.F
Displays the software version downloaded
Frequency
50 Hz
Nominal value of the network frequency. Select either
50 or 60 Hz. To modify this value, press 5and press
28to select the desired value. Press 5to validate
choice.
Active Group
1
This window displays the active protection and
automatic features group.
The display value can be 1 or 2.
Input 7654321
Status 0110110
Displays the status of the logic Inputs. The logic inputs
are numbered from 1 to 4 for P125 and 1 to 7 for
P126 and P127 reading from the right. When the
indicated status is 0 the logic input is inactive; when the
indicated status is 1 the logic input is active.
Relay 87654321
Status 01011101
Displays the status of the logic outputs. The logic output
relays are numbered from 1 to 6 for P125 and 1 to 8
for P126 and P127 reading from the right. When the
indicated status is 1 the logic output relay is active;
when the indicated status is 0 the logic output relay is
inactive.
NOTE: To reset a latched logic output relay press 0.
To activate an unlatching operation the password is
requested.
NOTE: The logic output relay (RL0) WATCHDOG is not displayed in the
output status window.

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MiCOM P125/P126/P127 Page 13/108
4.1.1 Additional OP PARAMETERS Menu Points for P126 & P127
Date
10/11/01
Displays the date. To modify this date press 5then
using 6enter the required value. Enable your choice
using 5. In this example the date is: November 10th
2001
Time
13:57:44
Displays the time. To modify the time press 5then
using 6enter the required value. Enable your choice
using 5. In this example the time is: 1:57:44 pm.
4.2 Menu CONFIGURATION
The following parameters can be set in the CONFIGURATION menu:
·labels used to display currents and voltages
·ratios for the earth and phase current transformers (CT)
·ratios for the residual voltage and phase voltage transformers (VT)
·LEDs 5 to 8.
The submenus are:
·General Options
·CT Ratio
·Led 5
·Led 6
·Led 7
·Led 8
·Group Select
To gain access to the CONFIGURATION menu from the default display, press 2
followed by 6until the desired submenu header is displayed.
4.2.1 Submenu General Options
The following submenu displays the connection mode only for the P127 and the
default display only for the P126.
The General Options submenu is not available for the P125 relay. The default display
is fixed to IN and there is no VT connection setting choice.
CONFIGURATION
Heading of CONFIGURATION menu.
To gain access to the General Options submenu, press
2and 6until the submenu is reached.
General Options
Heading of General Options submenu.
To navigate within submenu points, press 82. To
modify setting, press 5. Use 8246to scroll and set
available selections. Press 5to confirm choice.

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VT Connection
2Vpp+Vr
Displays the type of VT connection.
Select choice using the above instructions.
The available options are: 3Vpn, 2Vpp+Vr, 2Vpn+Vr.
To gain access to the next window press 2. To gain
access to the previous window press 8.
Default Displays
RMS I A
Displays the default current value (by selecting either
Phase A, Phase B, Phase C, or Earth N).
To modify this default value, follow the above
instructions. To gain access to the next window press
2. To gain access to the previous window press 8.
4.2.2 Submenu Transfo. Ratio
CONFIGURATION
Heading of CONFIGURATION menu.
To gain access to the Transfo. Ratio submenu, press 2
and 6until the submenu is reached.
Transfo. Ratio
Heading of Transfo. Ratio submenu.
To navigate within submenu points, press 82. To
modify setting, press 5. Use 8246to scroll and set
available selections. Press 5to confirm choice.
To gain access to the next window press 2. To gain
access to the previous window press 8.
Line CT primary
5 A
Displays the rated primary current of the line CT.
The setting range is from 1 to 9999.
This setting is only available in P126 and P127 relays.
Line CT sec
5 A
Displays the rated secondary current of the line CT.
The setting value is either 1or 5.
This setting is only available in P126 and P127 relays.
E/Gnd CT primary
5 A
Displays the rated primary current of the earth CT.
The setting range is from 1 to 9999.
E/Gnd CT sec
5 A
Displays the rated secondary current of the earth CT.
The setting value is either 1 or 5.

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The following displays and settings are only shown and applicable with the P127
relay.
Line VT primary
0.10 kV
Displays the rated primary voltage of the line VT. The
rated voltage input range is given by relay Cortec
code.
The setting range is from 0.1to1000kV, in steps of
0.01kV.
For the 220-480V model the setting range is from 220
to 480V, in steps of 1V.
Line VT sec
100.0 V
Displays the rated secondary voltage of the line VT. The
rated voltage input range is given by relay Cortec
code.
The setting range is from 57 to 130V, in steps of 0.1V
This window is not available for the 220-480V model.
The following displays are only shown if the connection mode 2Vpp+Vr or 2Vpn+Vr
is selected.
E/Gnd VT primary
0.10 kV
Displays the rated primary voltage of the earth VT. The
rated voltage input range is given by relay Cortec
code.
The setting range is from 0.1 to 1000kV, in steps of
0.01kV.
For the 220-480V model the setting range is from 220
to 480V, in steps of 1V.
E/Gnd VT sec
100.0 V
Displays the rated secondary voltage of the earth VT.
The rated voltage input range is given by relay Cortec
code.
The setting range is from 57 to 130V, in steps of 0.1V.
This window is not available for the 220-480V model.
WARNING: WITH THE P127 RELAY, NOT ALL MEASUREMENTS CAN BE READ IN THE
DIRECT MODE. THESE MEASUREMENTS MUST BE READ IN THE INDIRECT
MODE.
These measurement values are called derived measurements.
They depend on the selected electrical voltage connection mode.
4.2.3 Submenus to Configure LEDs 5 to 8
To gain access to the CONFIGURATION menu from the default display press 2.
Then press 6until the submenu Led is reached.
To reach the LED configuration submenu press 2for Led 5. Press 6to reach Led 6,
again to reach Led 7 and again to reach Led 8.
The following table lists the protection functions that can be assigned to the LEDs (5 to
8) for each MiCOM relay model.

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Directional overcurrent protection.
TEXT P125 P126 P127 Information
I> XInstantaneous 1st threshold phase overcurrent
tI> XTime delayed 1st threshold phase overcurrent
tIA> XTime delayed first threshold trip on phase A
tIB> XTime delayed first threshold trip on phase B
tIC> XTime delayed first threshold trip on phase C
I>> XInstantaneous 2nd threshold phase overcurrent
tI>> XTime delayed 2nd threshold phase overcurrent
I>>> XInstantaneous 3rd threshold phase overcurrent
tI>>> XTime delayed 3rd threshold phase overcurrent
Three phase overcurrent protection
TEXT P125 P126 P127 Information
I> XInstantaneous 1st threshold overcurrent
tI> XTime delayed 1st threshold overcurrent
tIA> XTime delayed first threshold trip on phase A
tIB> XTime delayed first threshold trip on phase B
tIC> XTime delayed first threshold trip on phase C
I>> XInstantaneous 2nd threshold overcurrent
tI>> XTime delayed 2nd threshold overcurrent
I>>> XInstantaneous 3rd threshold overcurrent
tI>>> XTime delayed 3rd overcurrent threshold
Directional earth fault protection
TEXT P125 P126 P127 Information
Ie> X X X Instantaneous 1st threshold earth overcurrent
tIe> X X X Time delayed 1st threshold earth overcurrent
Ie>> X X X Instantaneous 2nd threshold earth overcurrent
tIe>> X X X Time delayed 2nd threshold earth overcurrent
Ie>>> X X X Instantaneous 3rd threshold earth overcurrent
tIe>>> X X X Time delayed 3rd threshold earth overcurrent

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MiCOM P125/P126/P127 Page 17/108
Wattmetric Pe/IeCOS protection
TEXT P125 P126 P127 Information
Pe/IeCos> X X X 1st alarm threshold earth fault overpower/IeCos
(wattmetric)
tPe/IeCos> X X X 1st trip threshold earth fault overpower/IeCos
(wattmetric)
Pe/IeCos>> X X X 2nd alarm threshold earth fault
overpower/IeCos (wattmetric)
tPe/IeCos>> X X X 2nd trip threshold earth fault overpower/IeCos
(wattmetric)
Negative phase sequence overcurrent protection
TEXT P125 P126 P127 Information
I2> X X 1st alarm threshold negative sequence
overcurrent
tI2> X X 1st trip threshold negative sequence overcurrent
I2>> X X 2nd alarm threshold negative sequence
overcurrent
tI2>> X X 2nd trip threshold negative sequence overcurrent
I2>>> X X 3rd alarm threshold negative sequence
overcurrent
tI2>>> X X 3rd trip threshold negative sequence overcurrent
Thermal protection
TEXT P125 P126 P127 Information
Therm Trip X X Thermal trip overload threshold
Three phase undercurrent protection
TEXT P125 P126 P127 Information
I< X X Alarm threshold undercurrent
tI< X X Trip threshold undercurrent
Overvoltage protection
TEXT P125 P126 P127 Information
U> X 1st alarm threshold overvoltage
tU> X 1st trip threshold overvoltage
U>> X 2nd alarm threshold overvoltage
tU>> X 2nd trip threshold overvoltage

P12y/EN FT/D22 Technical Guide
User Guide
Page 18/108 MiCOM P125/P126/P127
Undervoltage protection
TEXT P125 P126 P127 Information
U< X 1st alarm threshold undervoltage
tU< X 1st trip threshold undervoltage
U<< X 2nd alarm threshold undervoltage
tU<< X 2nd trip threshold undervoltage
Residual overvoltage protection
TEXT P125 P126 P127 Information
Ue>>>> X X X Alarm threshold residual overvoltage
tUe>>>> X X X Trip threshold residual overvoltage
Broken conductor protection
TEXT P125 P126 P127 Information
Brkn. Cond X X Broken conductor detection trip
CB Fail
TEXT P125 P126 P127 Information
CB Fail X X Circuit breaker failure trip
Logic inputs
TEXT P125 P126 P127 Information
Input1 XXXCopy of the status of logic input no 1
Input2 XXXCopy of the status of logic input no 2
Input3 XXXCopy of the status of logic input no 3
Input4 XXXCopy of the status of logic input no 4
Input5 X X Copy of the status of logic input no 5
Input6 X X Copy of the status of logic input no 6
Input7 X X Copy of the status of logic input no 7
Autoreclose function
TEXT P125 P126 P127 Information
Recloser Run X X Signal that Autoreclose cycle is working
Recl. Blocked X X Signal for Autoreclose cycle end
Auxiliary timers
TEXT P125 P126 P127 Information
tAux1 XXX Copy of the status of logic input delayed by tAux 1
tAux2 XXX Copy of the status of logic input delayed by tAux 2
NOTES : Each parameter can be assigned to one or more LEDs.
One or more parameters (OR logic) can light each LED.