Relay Settings Calculations

Relay Settings Calculations

This technical report refers to the electrical protection of all 132kV switchgear. These settings may be reevaluated during the commissioning, according to actual and measured values. Protection selectivity is partly considered in this report and could be also re-evaluated. Names of parameters in this calculation may differ from those in the appropriate device.

Technical Data of the Lines

Main Line
Conductor Type ACSR Lynx
Length 27.8 km
Type ZM Type Tower
Positive sequence impedance0.1583 + j0.4004 (0.431 ∠68.4°) Ω/ km
Zero sequence impedance0.3246 + j1.228 (1.27 ∠75.2°) Ω/ km
Current capacity (A) 487
Next Line
Conductor Type ACSR Lynx
Length 36 km
Type ZM Type Tower
Positive sequence impedance0.1583 + j0.4004 (0.431 ∠68.4°) Ω/ km
Zero sequence impedance0.3246 + j1.228 (1.27 ∠75.2°) Ω/ km
Current capacity (A) 487

Protection Settings Calculations for Lines

SEL-311C Distance Protection Settings
Distance Zone
Non-Homogeneous Correction Angle
Load Impedance and Load Encroachment
Power Swing Detection/ Out of Step Detection
Switch on to Fault (SOTF)
Fuse failure scheme OR Loss of Potential (LOP)
SEL-351A Back-up Over Current Settings
Back up over current settings

Technical Data of the Power Transformers

Transformers-1
Type of coolingONAN / ONAF
Vector GroupDyn11
Rated Voltage HV V132000
Rated Voltage LV (V)11500
Full Load current HV ( A)87.48 / 113.72
Full Load current LV (A)1004.12 / 1305.35
Rated Power ( MVA)20 / 26
% impedance at the normal tap (12 no.)10.15% / 13.20 %
Type of tap changerOn load
the voltage at the maximum tap (V)145200
The voltage at the minimum tap (V)118800
Transformers- 2
Type of coolingONAN / ONAF
Vector GroupDyn11
Rated Voltage HV (V)132000
Rated Voltage LV (V)11500
Full Load current HV ( A)43.7 / 56.9
Full Load current LV (A)502 / 652.7
Rated Power ( MVA)10 / 13
% impedance at the normal tap (12 no.)10.15% / 13.20 %
Type of tap changerOn load
The voltage at the maximum tap (V)145200
The voltage at the minimum tap (V)118800

Protection Settings Calculations for Power Transformers

SEL-787 Transformer Differential Protection
Differential Pick-up
Slope-1 Setting
Slope-2 Setting
Differential Unrestrained (U87P (Un-restrained Differential Pick-up))
2nd HARMONIC
5th HARMONIC

SEL-351A Transformer HV Over Current
Pick-up Setting
51PP (for phase fault element)
51GP (for earth fault element)
Time Multiplier Setting

11 kV Outgoing Protection Settings

SEL-551C LT Over-Current and Earth Fault
CDG21 LT Neutral Standby AC series Earth Fault

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  • 87G Generator Differential Protection
  • 87T GSU Trans. Differential Protection
  • 87GT Overall Differential Protection
  • 40G Generator Field Failure Protection
  • 78G Generator Pole Slipping Protection
  • 50S, Generator Split phase overcurrent protection
  • 46 Generator Negative Phase Sequence Protection
  • 51V Generator Voltage-Dependent O/C Protection
  • 49S Generator Stator Overload Protection
  • 59G Generator Overvoltage Protection
  • 21G Generator Underimpedance Protection
  • 27G Generator Undervoltage Protection
  • 32R Generator Reverse Power Protection
  • 64S Generator 95%&100% Stator Earth Fault Protection
  • 51/27 Generator Dead Machine Protection
  • 64GB Generator Busbar Earth Fault Protection
  • 64R Generator Rotor Earth Fault Protection
  • 81O Generator Overfrequency Protection
  • 81U Generator Underfrequency Protection
  • 24G Generator Overflux Protection
  • 47G Generator Fuse Failure Supervision
  • 50/51ET Excitation Trans. Overcurrent Protection
  • 49ET Excitation Trans. Overload Protection
  • 51N-GSU Gen. Step-up Trans. Neutral Point OvercurrentProtection
  • 64T GSU Trans. Restricted Earth Fault Protection
  • 50/51T GSU Trans. Over Current Protection
  • 50/51SST Station Service Trans. Over Current Protection
  • …..

Attached PDFs

  • Std. 242: Buff Book
  • C37.102: IEEE Guide for Generator Protection
  • C37.101: IEEE Guide for AC Generator Ground Protection
  • C37.106: IEEE Guide for Abnormal Frequency Protection for Power Generating Plants

WHY GENERATOR PROTECTION?

  • Unnecessary tripping of Generators is undesirable (production losses)
  • Generator differential
  • Transformer differential
  • Four-step overcurrent protection (DFT based measurement)
  • Four-step residual overcurrent protection
  • Over/under voltage protection (DFT based measurement)
  • Residual overvoltage protection
  • Overexcitation protection
  • General current and voltage protection
  • Directional over/under power function
  • 21P Phase distance backup
  • 51N Neutral time overcurrent
  • 24 Volts per hertz
  • 59N Neutral overvoltage
  • 25 Synchrocheck
  • 59P Phase overvoltage
  • 27P Phase Undervoltage
  • 59X Auxiliary overvoltage
  • 27TN Third harmonic neutral Undervoltage
  • 59_2 Negative-sequence overvoltage
  • 27X Auxiliary Undervoltage
  • 64F Field ground protection
  • 32 Sensitive directional power
  • 64S Sub-harmonic stator ground protection
  • 40 Loss of excitation
  • 64TN 100% stator ground
  • 46 Generator unbalance
  • 67-2 Negative-sequence directional overcurrent
  • 49 Thermal overload protection (RTD)
  • 67N Neutral directional overcurrent
  • 50BF Breaker failure
  • 67P Phase directional overcurrent
  • 50G Ground instantaneous overcurrent
  • 68 Power swing blocking
  • 50N Neutral instantaneous overcurrent
  • 78 Out-of-step protection
  • 50P Phase instantaneous overcurrent
  • 81O Overfrequency
  • 50SP Split phase protection
  • 81R Rate of change of frequency
  • 50/27 Accidental energization
  • 81U Underfrequency
  • 51G Ground time overcurrent
  • 87RGF Restricted ground fault
  • 51PV Phase time overcurrent with voltage restraint
  • 87S Stator differential

Basic Generator Protection Features

  • Ground differential
  • Sensitive restricted earth fault
  • Thermal overload
  • Negative-sequence
  • Residual-ground and neutral-ground overcurrent elements
  • Directional residual-ground
  • Overcurrent elements
  • Unbalance element
  • Voltage-controlled, voltage-restrained time-overcurrent
  • Breaker failure protection for three-pole breaker
  • Under- and overvoltage
  • Inverse-time over- and Undervoltage elements
  • Loss-of-potential element
  • Volts/hertz or overexcitation protection
  • Directional power elements
  • Loss-of-field
  • Over- and under frequency protection
  • Rate-of-change-of- frequency
  • RTD protection
Optional Generator Protection
  • Generator synchronism check
  • Synchronism-check under- and overvoltage
  • Inverse-time over- and Undervoltage
  • Out-of-step
  • vector shift
  • 100% stator ground protection
  • …..

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2DCC.dz
2TJM.dz
469.dz
489.dz

745.dz
7SA510.dz
7SA511.dz
7SA513.dz
7SA522.dz
7SA6.dz
7SD511.dz
7SD52.dz
7SD600.dz
7SD610.dz
7SJ41.dz
7SJ50.dz
7SJ511.dz
7SJ512.dz
7SJ531.dz
7SJ551.dz
7SJ600.dz
7SJ601.dz
7SJ602.dz
7SJ61.dz
7SJ62.dz
7SJ63.dz
7SJ64.dz
7SJ70.dz
7SJ73.dz
7SJ80.dz
7SK72.dz
7UM62X.dz
7UT512.dz
7UT6xx.dz
7VK1440.dz
8ZLS.dz
Areva P111.dz
Argus M.dz
Argus.dz
CAG.dz
CDD.dz
CO.dz
DFP 200.dz
DLPD.dz
DPU 2000R.dz
Duobias-M.dz
EPAC.dz
F21 Distance Mho.dz
F21 Distance Polygonal RX.dz
F21 Distance Polygonal.dz
F24 Overflux.dz
F27 Phase undervoltage.dz
F27D Positive sequence Undervoltage.dz
F32_F37 Under-_Over-Power.dz
F40 Loss of field.dz
F46 Unbalance overcurrent.dz
F47 Unbalance overvoltage.dz
F49 Thermal image.dz
F50_F51 Phase overcurrent.dz
F50BF Breaker failure.dz
F50N_F51N Neutral overcurrent.dz
F50V_F51V Voltage restraint overcurrent.dz
F59 Phase overvoltage.dz
F59D Positive sequence overvoltage.dz
F59N Neutral overvoltage.dz
F650.dz
F67 Phase directional.dz
F67_F50_F51 Phase directional overcurrent.dz
F67N Neutral directional.dz
F67N_F50N_F51N Neutral directional overcurrent.dz
F68 OOSPower Swing.dz
F78V Vector jump.dz
F79 Recloser.dz
F81 Frequency.dz
F81R Rate of Frequency change.dz
F87L Line Differential (angular 1 phase).dz
F87L Line Differential (angular 3 phase).dz
F87L Line Differential (magnitude).dz
F87REF Restricted Earth Fault.dz
F87T Transformer Differential.dz
Form 4C.dz
Form 5.dz
Form 6.dz
FX-FXA-FXB.dz
GAD.dz
GN3.dz
GRL100.dz
Hi-Lo.dz
IAC.dz
IFC.dz
IKT9.dz
IMPRS.dz
KCEG.dz
KCGG.dz
LFAA.dz
LFCB.dz
LZ92.dz
LZ96.dz
M3425.dz
MBCH.dz
MBCI.dz
MBCZ.dz
MCAG.dz
MCGG.dz
MCSU.dz
MCTI.dz
METI.dz
Micromho.dz
Motor protection sim.dz
Motor protection.dz
MVTR51.dz
MWTU14.dz
Ohmega3xx.dz
Ohmega4xx.dz
Optimho.dz
P114S.dz
P115.dz
P12x.dz
P13x.dz
P14x.dz
P211.dz
P220.dz
P341.dz
P34x.dz
P43x.dz
P44x.dz
P54x.dz
PD521.dz
PD531.dz
PD532.dz
PD551.dz
PD552.dz
PD932.dz
PR511.dz
PR512.dz
PS431.dz
PS441.dz
PS451.dz
PS462.dz
PXLN.dz
PXLP 3000.dz
Quadramho.dz

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RACID.dz
RADS-B.dz
RADS-C.dz
RAKZB.dz
RAZFE.dz
RAZOA.dz
RED 670.dz
REF 542+.dz
REF 550.dz
REF 601.dz
REF610.dz
REF615.dz
REG 216.dz
REG 670.dz
REJ 521.dz
REJ 523.dz
REJ 525.dz
REJ 527.dz
REJ 603.dz
REL 100.dz
REL 300.dz
REL 301.dz
REL 511.dz
REL 512.dz
REL 521.dz
REL 531.dz
REL 561.dz
REL 670.dz
REM 543.dz
REM 610.dz
RET 670.dz
RR3M.dz
RxAs52k.dz
RXIDF.dz
RXIDG.dz
RXIDK 2H.dz
RXIDK 4.dz
RXIG.dz
RXPDK.dz
RYDSA.dz
SACE ISOMAX S1-S8.dz
SACE PR121.dz
SACE PR122.dz
SACE PR123.dz
SACE PR221_PR211_PR212.dz
SACE PR231.dz
SACE PR33x.dz
SACE TMAX T1-T7.dz
SD14.dz
SD34.dz
SEL 251.dz
SEL 267.dz
SEL 279.dz
SEL 300G.dz
SEL 311A.dz
SEL 311B.dz
SEL 311C.dz
SEL 311L.dz
SEL 321.dz
SEL 351.dz
SEL 351R.dz
SEL 387.dz
SEL 411L.dz
SEL 421.dz
SEL 451.dz
SEL 487E.dz
SEL 501.dz
SEL 551.dz
SEL 587.dz
SEL 700G.dz
SEL 751.dz
SEPAM 10.dz
SEPAM x20.dz
SEPAM x4x.dz
SEPAM x8x.dz
Siemens 3WN1_3WS.dz
Siemens 3WN6.dz
Solkor M.dz
Solkor N.dz
Solkor R-Rf.dz
SPAD 346.dz
SPAF 140C.dz
SPAJ 110C.dz
SPAJ 111C.dz
SPAJ 115C.dz
SPAJ 131C.dz
SPAJ 135C.dz
SPAJ 140C.dz
SPAJ 141C.dz
SPAJ 142C.dz
SPAJ 144C.dz
SPAJ 160C.dz
SPAJ 32x.dz
SPAM 150C.dz
SPRECON E-P DS.dz
SPRECON-E DD.dz
SPRECON-E-P DSR.dz
TLS 1000.dz
UR D60.dz
UR F60.dz
UR G30.dz
UR G60.dz
UR L90.dz
VAMP 130.dz
VAMP 135.dz
VAMP 140.dz
VAMP 150.dz
VAMP 210.dz
VAMP 230.dz
VAMP 245.dz
VAMP 255.dz
VAMP 257.dz
VAMP 265.dz
VAMP 40.dz
VDG14.dz
VIP 30 – 35.dz
VIP 300.dz

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MiCOM has different protection relays. In this 4 hours course, we try to help you learning work and config the MiCOM P123, and MiCOM P441 relays.

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  • Online video training (reserve your seat now)
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Part 01: MiCOM relays range, naming, and application is presented.

Parts 2-7: These parts present exercises with MiCOM P123 and AMT105 setup. Three-phase signals are injected into the relay to test hardware connection and protection functions.

Part 8-17: These parts present exercises with MiCOM P441 and AMT105 (configuration and PSL, event and disturbance recorder, overcurrent protection, voltage protection, negative sequence protection, and distance protection parameters).

Supplementary files attached

  • 01 start working with Easergy Studio in online mode
  • 02 MiCOM Relay Measurements, Event Logs & Disturbance Records
  • 03 Input naming in the Micom relays
  • 04 Communicate with MiCom P139
  • 05 Communicating with MICOM P139 checking the parameters from the front panel
  • 06 Binary input test from MICOM P139 front panel
  • 07 Binary input test from MICOM P139 front Easergy studio
  • 08 Function Parameters in the MICOM P139
  • 09 Overcurrent Function test in the Micom P139
  • 10 Inverse time overcurrent function IDMT test in the MiCOM P139
  • 11 CBF function config and parameters in the Micom P139
  • 12 Autorecoser function config in the MiCOMp139
  • 13 Autorecoser function test in the MiCOMp139
  • 14 Autorecoser function test in the MiCOMp139 By FREJA
  • 15 Under and Over Voltage protection function parameters and testing in the MiCOM P443
  • 16 Overcurrent and Earth Fault protection function parameters and testing in the MiCOM P443
  • 17 DEF protection function parameters and testing in the MiCOM P443
  • 18 Auto recloser function test in the MiCOM P546
  • 19 Trip Scheme in the Micom P546
  • 20 SOTF in the Micom P546
  • 21 MICOM P546 Differential protection test.
  • 22 MICOM P546 Syncro Check

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Testing and Commissioning of Protective Relays

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Pack Details:

  • Introduction and general settings for the relay test kits
  • Testing of binary inputs and outputs and wet and dry contacts
  • Overcurrent Functions (ANSI 50, 51, 50N, 51N)
  • Directional Overcurrent Functions
  • Distance protection function
  • Differences between RIO and XRIO files with details
  • How to write or edit the XRIO files
  • Combine overcurrent curves
  • Fault types
  • Testing of the binary inputs in wet and dry contacts
  • Testing of the relay to show the trigger concept
  • Transient test
  • Testing of the Power swing detection function

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