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MiCOM P125 rangeDirectional /non Directional relays
Introduction The MiCOM Directional /non-Directional Relays provideflexible and reliable integration
of protection, control,monitoring and measurementfunctions.Extensive functionality is able toprovide complete protection andcontrol for a wide range of overhead lines and undergroundcables from distribution totransmission voltage levels,capacitors bank, generators andtransformers generator schemes.
Protection• Directional/non Directional
phase overcurrent
• Directional/non Directionalearth fault
• Wattmetric earth fault
• Three phase Overcurrent
• Under current
• Negative phase overcurrent
• Cold load pick up
• Thermal Overload• Under voltage
• Over voltage
• Residual Over voltage
• Broken Conductor
• Circuit breaker failure
Control• Multi shot autoreclose
• Blocking logic
• Circuit breaker control
• Selective relay scheme logic• Start contact
• Programmable AND logic
• One/Two setting groups
• Programmable relay outputs
• Programmable optically
isolated inputsMeasurement
• Comprehensive measurementvalues
• Instantaneous
• Integrated
Post fault analysis• Event and fault records
• Disturbance records
Monitoring
• Breaker state monitoring• Breaker condition monitoring
• Trip circuit SupervisionCommunications
• A choice of protocols
• Front and rear communicationports
Diagnostic
• Power-up diagnostic
• Continuous self monitoring
• Test facilitiesUser friendly interface
• Liquid crystal display withback light
• Programmable LEDindications
• Password protection
Software support
• MiCOM S1 software forsetting, measurements, faults,alarms, events, disturbance
records, monitoring and faultanalysis.
P125
P126
P127
DIRECTIONAL/NON DIRECTIONALEARTH FAULT RELAY
THREE PHASE OVERCURRENT ANDDIRECTIONAL/NON DIRECTIONAL
EARTH FAULT RELAY
DIRECTIONAL/NON DIRECTIONALOVERCURRENT AND DIRECTIONAL/NON
DIRECTIONAL EARTH FAULT RELAY
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FUNCTIONS ANSI CODEMiCOM
P125
MiCOM
P126
MiCOM
P127
Directional/non Directional earth fault 67N/50N/51N X X X
Directional/non directional phase overcurrent 67/50/51 X Three phase overcurrent 50/51 X
Wattmetric protection 32N X X X
Broken conductor detection X X
Undercurrent 37 X X
Negative phase sequence overcurrent 46 X X
Thermal overload 49 X X
Undervoltage 27 X
Overvoltage 59 X
Residual overvoltage 59N X X X
Auto-reclose (4 shots) 79 X XCircuit breaker failure 50BF X X
Circuit breaker monitoring and control X X
Trip Circuit Supervision [TCS] X X
Blocking logic X X X
Cold load Pick up X X
Output relay latching 86 X X X
Selective relay scheme logic X X
Start contact X X X
Programmable AND logic X X
Setting group 1 2 2Measurements X X X
Fault records X X
Event records X X
Disturbance records X X
Test facilities X X X
Diagnostic/self monitoring X X X
Network Communication X X X
RS232 front port X X X
Support software (MiCOM S1) X X X
MODELS AVAILABLE AND FUNCTIONALITIES
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Application The MiCOM P125 series issuitable for all applicationswhere directional overcurrentand directional earth faultprotection is required. The integration of manyfunctions provides completeprotection for a wide range of overhead lines andunderground cables, fromdistribution to transmissionvoltage levels. It is suitable forsolid earthed, resistanceearthed. Inductance earthed(Petersen coil) isolated system.A comprehensive suite of
overcurrent protection providesan economic solution tocomplex applications. The fig.1a shows the insertion of P126 for a general distributionunderground line. The fig. 1b shows the P127applied to parallel feeders. The MiCOM P125 range relaysare also applicable in generatorand in generator transformers
schemes.A range of communicationprotocols allows connection withmany external devices thusproviding remote programmingcontrol and extraction of information.
P12750 46 27
51 37 BC
67 59 50BF67N 59N 50N/51N
Load
P126
50N 46 4951N 37 50BF
67N 50 BC
59N 51 79
Underground cable applicationFig. 1a:
Feeder applicationFig. 1a:
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available. Each stage can beconfigured in AND / OR logicmode.
Overvoltage Two independent stages withdefinite time elements are
available. Each stage can beconfigured in AND / OR logicmode.
Residual OvervoltageResidual over-voltageprotection is available fordetecting earth faults in highimpedance earthed or insultedsystem. The neutral voltagecan be measured directlyusing a VT transformer or
derived in according to theinsertion mode of the phasevoltage.An independent stage withdefinite time element isavailable.It is named as 4th stage.
Blocking logicWhen MiCOM P125 relays areused in critical networks,management of protections
must take care of surroundingdevices.2 blocking logic inputs can beconfigured independently fromeach other to block anycombination of the selectedelements (e.g. currentelements, thermal overloadetc.)Each blocking signal freezes itsassociated memory (timer orthermal state) after drop off, itrestart from the pre-blockingvalue and status if conditionsare still present.
Selective relay schemelogicP125 range relay includesselective relay scheme logic.A dedicated digital input cantemporarily alter the timedelay settings in response to adownstream relay phase/earth
fault start condition. This function allows theMiCOM relays to discriminate
correctly when used in acascade scheme. The selective relay scheme logicfunction can be enabled ordisabled by the user asrequired.
Cold load pick upCold load pick-up temporarilyraises the phase overcurrent,earth overcurrent, thermalstatus, negative sequenceovercurrent settings followingclosure of the circuit breaker,allowing the protection settingsto be set closer to the loadprofile.
Setting groupsExternal conditions may requestthe need of different settings.MiCOM P126 and P127 relaysprovide two setting groupsincluding all the protection,automation features andmonitoring functions. The switching between group 1and group 2 can be achievedlocally, remotely, via adedicated logic input.All settings are stored in
E2PROM (non-volatile rewritingmemory)
Programmable inputs
and outputsMiCOM P125 range include upto 7 logic inputs and 9 logicoutputs including watch dog.For P125 range two of outputrelays are change over type.Change over output type istypically used for tripping
commands.
Protection and control elementscan easily be assigned to anyoutput.All inputs and outputs are freelyconfigurable.
Latching of the outputs
relayAny of the output relays can belatched, excluded the tripcommand relay (relay n.1). The associated functions to tripcommand relay can be latched.Reset of all outputs and tripcommands is possible by logicinput, a push button on front HMIor through the local areanetwork.
Circuit breaker failureprotectionCircuit breaker failure protectionmay be used for trippingupstream circuit breakers andalso the local secondary trip coilwhen a local breaker failure isdetected.
AutorecloseIt provides three pole multi-shotautoreclose, setting change
during dead and reclaim timewhether enable and virtualreclose when two CBs in seriesMV distribution system using fuseare present. The user may select whichprotection elements and/or adigital input may start any of fourshots independently.Each shot has independentlysettable dead and reclaim time. A
counter stores the number of reclose commands incrementedwith each reclose order.
Monitoring andmeasurementCircuit-Breaker monitoringPreventive circuit-breakermaintenance is the advancefunction provided by the MiCOMP126 and P127 with adjustableclosing and opening timemeasurements and breakerfailure protection.
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All phase currents I and I2
during faults are memorisedand summed.Trip Circuit Supervision[TCS]MiCOM P126 and P127 relays
allow trip circuit supervisionvia a specific input. Result of this monitoring can be locallyor remotely transmitted.MeasurementsMiCOM P125 relays monitorpermanently all of theanalogue inputs (voltage andcurrents) display the values onthe LCD and store in memorythe measurements.
The measured values are thetrue RMS up to the 10th
harmonic with a 0.1%accuracy (nominal conditions).Peak demands with a 15minute window are alsomemorised.All measured and calculatedvalues can be displayed on theHMI or transferred locally orremotely upon user request.
Event records75 logic events restored inMiCOM P126 and P127relays.Events include inputs/outputs,change of status, alarms andcontact operations.All events are time stamped to1ms.Disturbance recordsVoltage and currentwaveforms are captured byMiCOM P126 and P127 relaysat 1600Hz.Up to 3 seconds of records arestored inside MiCOM relays.Disturbance recording functionis triggered either by any of the programmed threshold orby an external input throughthe local area network.Fault records5 faults are stored inside the
MiCOM relays.Each fault includes:
• Record number
• Fault time• Fault date• Active setting group
• Faulted Phase
• Protection operation• MagnitudeFault indicator help the user toidentify clearly the fault and tomonitor the MiCOM P126 andP127 relay settings.
User interfaceFront display and menusAll functions includingprotection, automation,communication, LEDs, inputs
and outputs can beprogrammed and modifiedusing the front panel userinterface. The 32 alphanumeric backlit LCdisplay (available in a range of
languages) provides the user
with key information (faults,measurements, settings etc)
The menus have a pull-downstructure for easy use and quickaccess to any data.Dedicated Leeds
4 Leeds indicate the status of theMiCOM relays (trip order,alarms, power on, watch dog)Acknowledge of alarm and tripLEDs can be easily performedlocally or remotely.Programmable LEDs4 freely programmable LEDs areprovided on all models of theMiCOM P125 range. The user can assign
independently to each LED anyprogram function or combinationof thresholds.KeypadA seven button tactile keypad onthe front panel allows the usereasy access to any data in theMiCOM P125 range relays.
Local and Remote
Communication Two communication ports are
available; a rear port providingremote communication and afront port providing localcommunication.Remote communication The remote communications arebased on RS485 voltage levels. This port is available forMODBUS, Courier, IEC 60870-5-103 and DNP3 protocols.MiCOM relays can transmit to thelocal monitoring system (e.g.
MiCOM S10) or remotely to theSCADA settings, measurements,
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alarms, fault events, anddisturbance records. The communicationparameters (relay address,data rate, parity, etc.) can beprogrammed using the HMI
front port.Local communications The front serialcommunications port has beendesigned for use with MiCOMS1, which fully supportsfunctions within the relay byproviding the ability toprogramme the setting off-line, extract and view event,disturbance and perform
control functions.
The interface MiCOM S1software interface will be fullWindows TM last versioncompatible.
DiagnosticAutomatic tests performed
including power-on diagnosticand continuous self-monitoringensure a high degree of reliability.
HardwareMiCOM P125, P126 and P127models are digital protectionsand control relays.CaseFor all models of MiCOM P125range (P125, P126, P127) the
unit has a drawout metal 4Ucase.
The width is:P125 -> 20TEP126 and P127-> 30TEAll CTs inputs are short-circuitedif the active unit is withdrawnfrom the case.
All MiCOM relays can be inpanel or rack mounted.WiringExternal connections are madevia MIDOS type terminal blocks.Each connection includes2x6.35mm Faston and one M4screw fixing. The wiring for all the MiCOMP125 range is standard toprovide maximum compatibility.
A B C
1A
55
56 32N 50N 51N
67N 59N
WD
RL1
35
37
364
6
210
12
8
RL3
RL4
RL6
RL5
14
16
18
20
3
1
7
5
22
2426
28
17
19
21
23
~/+ 33
Auxi iary Vo tage
~/- 34
MiCOMP125
25A
26A
5A
47
29
30
Case earth
connection
Termina
RS48531
32
RS485
Communication Port
+
Watch Dog
Programmable output
Programmable input L1
Programmable input L2
Programmable input L3
Programmable input L4
Programmable tripping output
Programmable output
Programmable output
Programmable output
Programmable output
A
BCP ase rotation
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25A
26A
49
51
50
A B C
1A
1A
1A
1A
5A
5A
5A
5A
52
53
54
55
56
41
42
44
45
46
47
48
21A
WD
RL1
RL2
RL3
RL4
RL6
RL5
RL7
RL8
3736
6
2
10
12
814
16
18
3
1
7
6
11
13
15
22
24
26
17
19
21
25
4A
2A
3A
1A
~/+ 33
Auxiliary Voltage~ - 34
29
30
Case earth
connection
Termina
RS485
31
32
RS485Communication
+
MiCOM
P126
A
BCP ase rotation
50 51 32N
50N 51N67N
37 46 49
79 BC
50BF
59N
TCS
Watch Dog
Programmable tripping output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable input L1
Programmable input L2
Programmable input L3
Programmable input L4
Programmable input L5
Programmable input L6
Programmable input L7
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Two phases-neutral plus Delta Earthconnection
T
wo
phase
to
ph
onnection
Two phase to phase plusDelta Earth connection
Internal reconstruction voltage UC
A B C A B C21A
22A
Internal reconstruction voltage UCA
23A
24A
25A
26A
21A
22A
24A
25A
26A
49
51
50
Internal reconstruction volta e Ue
A B C
1A
1A
1A
1A
5A
5A
5A
5A
52
53
54
56
41
43
42
44
45
46
47
48
21A
22A
24A
25A
26A
50 51 67
32N 50N 51N
67N 37 46
49 79 BC
50BF
59 59N 27
WD
RL1
RL2
RL3
RL4
RL6
RL7
RL8
35
37
4
6
10
12
814
16
18
20
3
1
7
6
9
11
13
15
22
24
26
28
17
19
21
23
27
25
4A
2A
3A
1A
~/+ 33
Auxiliary Voltage~ - 34
29
30
Case eartconnection
Terminal
RS48531
32
RS485+
MiCOM
P127
TCS
A
BCPhase rotation
Watch Dog
Programma e tripping
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable output
Programmable input L1
Programmable input L2
Programmable input L3
Programmable input L4
Programmable input L5
Programmable input L6
Programmable input L7
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Technical specificationsInputsAC phase current 1 and 5 AmpAC earth current 1 and 5 AmpAC phase and residual voltage
from 57 to 130V
from 220 to 480VFrequency 50/60HzAuxiliary Voltage Vaux 24 - 60V
48-150V110-250Vdc/110-250Vac
BurdensAC current Phase<0.025VA (1A)
<0.3VA (5A)Earth<0.008VA at 0.1Ie (1A)
<0.01VA at 0.1Ie (5A)DC auxiliary voltage 3W standby+0.25 per
energised relayOptical isolated input 10mA per inputThermal withstandAC current inputs 1s @ 100 x rated current
2s @ 40 x rated currentcontinuous @ 4 x rated current
AccuracyProtection thresholds +/-2% Time delay +/-2% with a minimum of 10 msMeasurements typical +/-0.2% at In
typical +/ -0.2% at UnCT requirementPhase inputs Typical 5VA 5P10Earth inputs Core balanced CT or residual
connection to phase CTsHMIDisplay : 2 x 16 alphanumeric characters
back-lit LCDled : 8 including 4 programmablekeyboard : 7 sensitive keypadSerial port: RS232 for setting softwareDirectional/Non-Directional phaseOvercurrent settings:
current from 0.1to 40 In,Max Torque Angle from 0°to 359°, Trip zone from 10° to 175°.IDMT Curves / DT.Directional/Non-Directional earth faultsettings:current from 0.002 to 40 Ien,voltage from 0.01 to 0.5 Uen,
Max Torque Angle 0 to 359°, Trip zone: 10 to 175°.IDMT Curves / DT.
Directional/non Directional overcurrentand Directional/non Directional earthfault time settingDMT:Phase time (I>, I>>, I>>>) 0 ms to 600sEarth time (Ie>, Ie>>, Ie>>>) 0 ms to 600s
IDMT curves:IEC type: Short time inverse (IEC)
Standard inverse (IEC)Very inverse (IEC)Extremely inverse (IEC)Long time inverse (IEC)
IEEE/ANSI type: Short time inverse (CO2)Moderately inverse (ANSI)Inverse (CO8)Very inverse (ANSI)
Extremely inverse (ANSI)Rectifier Protection type RECTElectromechanical type RI
Time multiplier setting (TMS)0.025 to 1.5 step 0.025
Reset time:IDMT curves: Short time inverse (CO2)
Moderately inverse (ANSI)Inverse (CO8)Very inverse (ANSI)Extremely inverse (ANSI)
DMT: 0 to 60s step size 0.01s
Earth fault Wattmetric thresholds:from 0.001 to 1.5 Pen,
Max Torque angle from 0°to 359° Trip zonefrom 10° to 170°.Delay time 0 to 600s.
Under current thresholdsfrom 5 to 100% of In
Negative sequence current thresholds:from 0.1 to 40 x In
IDMT curve identical to phase overcurrent;DT: from 0 to 600s.Broken Conductor:Ratio I2/I1 from 20 to 100%DT from 0 to 15000s step size 1sThermal replica thresholds: Threshold from 0.08 to 3.2 In,
θ from 50 to 200%, Thermal constant from 1 to 200 min, delaytime 0 to 600s.Under voltage thresholds:
from 0.05 to 1 UnDelay time 0 to 150s
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Over voltage thresholds:from 0.05 to 1.5 UnDelay time 0 to 150sZero Sequence Voltage thresholds:from 0.01to 1 UenDelay time from 0 to 150s
Cold load Pick Upform 100% to 500% delay time 0 to 3600sAuto reclose (79)4 shots: dead and reclaim time from 0 to 600sCircuit breaker control (50BF)t_BF1, t_BF2 from 0.1 to 10sCircuit Breaker control Trip time from 0.1 to 5s. step size 0.1sClosing time from 0.1 to 5s step size 0.1sContactsRating Make: 30 Amps and carry for 0.2s
Carry: 5 Amps continuousBreak: 135 Vdc, 0.3(L/R=30ms)
220 Vac, 5A (cos ϕ =0.6)
Mechanical durability >100000 operationsHousingCase :
4U (177mm) HMiCOM P125 20 TEMiCOM P126 30 TE
MiCOM P127 30 TEWeight:P125 c. 2KgP126 c. 3KgP127 c. 3.5KgMounting:Rack or flush mountingConnectionsRear, full draw-out with automatic CT shortingProtection: IEC 529; IP 52, IK 07(double faston + M4 screw per connection)
High voltage withstandDielectric withstand (50/60Hz) IEC 60255-5 2 kV in common mode
1 kV in differential modeImpulse voltage IEC 60255-5 5 kV in common mode
1 kV in differential mode
Insulation resistance IEC 60255-5 > 1000 MΩElectrical environmentHigh frequency disturbance IEC 61000-4-1 2.5 kV in common mode, class 3
1 kV in differential mode, class 3Fast transient disturbance IEC 61000-4-4 4 kV auxiliary supply, class 4
ANSI C37.90.1 2 kV other, class 4Electrostatic discharge IEC 61000-4-2 8 kV, class 4Radio frequency impulse ANSI C37.90.2 35 V/m
IEC 61000-4-3 10 V/mEnvironmental withstand Temperature IEC 60255-6 Storing and transportation
-25°C to +70°COperation -10°C to + 55°C
Humidity IEC 60068-2-3 56 days at 93% RH and 40°C
Enclosure protection IEC 60529 IP 52, IK 07Vibration IEC 60255-21-1 Response and endurance, class 2Shock and bump IEC 60255-21-11 Response and withstand, class 1Seismic IEC 60255-21-3 Class 1
Product safety
72/73/EEC
Compliance with European Commission Low Voltage Directive.Compliance is demonstrated by reference to generic safety standards:
EN61010-1 : 1993/A2: 1995
EN60950 : 1992/A11: 1997
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MiCOM P125 rangeoutline descriptionDirectional / non DirectionalPhase OvercurrentDirectional / non Directional
earth fault overcurrent relayin drawout 4U metal case. The following functions mustbe available :
• 3 independent phasethresholds(instantaneousand delayed) 67/50/51
• 3 independent earththresholds (instantaneousand delayed)67N/50N/51N
• Tripping curves type IEC(short time inverse,standard inverse, veryinverse, extremely inverse,long time inverse) andIEEE/ANSI (short timeinverse, moderatelyinverse, inverse, veryinverse, extremely inverse)
• Negative phase sequenceovercurrent - 46
• Undercurrent - 37
• Thermal overload – 49
• Phase Overvoltage – 59• Phase Undervoltage – 27
• Residual Overvoltage59N
• Output relay latching - 86
• Broken conductordetection
• 4 shot auto-recloser - 79
• Circuit breaker failuredetection 50 BF
• Circuit breakermonitoring
• Trip circuit supervision
The relay must providedcomplete measurements andrecording functions including
• True RMS values
• Event recorder with thelast 75 events, 1ms timestamped.
• Fault recorder with thelast 5 faults
• Disturbance recorder withstorage of 5 records for 3seconds each
User interface shall include
• A 32 characters backlitdisplay
• Programmable LEDs
• A front panel RS232 forlocal settings
• A RS485 rear portcompatible withMODBUS, Courier orIEC60870-5-103, DNP3
• An easy to use PC settingsoftware
ORDERING CODE
MECHANICALDRAWING
X X
P 1 2 5P 1 2 6P 1 2 7
0,1-40 Ion A0,01-8 Ion B
0,002-1 Ion C
57-130V A
220-480V B
A
FM
123
4
French 0
English/American 1Spanish 2
German 3Italian 4
Russian 5
Polish 6Portuguese 7
Dutch 8Czech A
Ordering Code
MiCOMMiCOMMiCOM
Earth current input
Voltage input
Auxiliary supply voltage24-60Vdc
48-150Vdc110-250Vac
Communication protocol
HMI Language
MODBUSK-BUS/COURIER
IEC 60870-5-103/VDEW
DNP3
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