MiCOM P442 setting example

FOR REFERENCE ONLY

139 KM0.02897 Ohms0.30720 Ohms0.30856 Ohms0.25697 Ohms1.02230 Ohms1.05410 Ohms4.02683 Ohm

42.70080 Ohm42.89025 Ohm

84.58 Degree35.71883 Ohm142.0997 Ohm146.5202 Ohm

75.86 DegreeZero Sequence Impedence for Protected lineZero Sequence Impedence Angle

Positive sequence impedance per KMZero Sequence Resistance per KMZero Sequence Reactance per KMZero Sequence Impedance per KM

Positive Sequence Impedence for Protected linePositive sequence Impedence angle

Positive Sequence Resistance for Protected linePositive Sequence Reactance for Protected line

Zero Sequence Resistance for Protected lineZero Sequence Reactance for Protected line

DETAILS OF ADJACENT LINE : (NAKODAR - MAKHU)

400kV Rajpura TPPS - Nakodar Line (Main 1) RELAY TYPE : MiCOM P444

DETAILS OF PROTECTED LINE : (RAJPURA TPPS - NAKODAR) Length of protected linePositive Sequence Resistance per KMPositive Sequence Reactance per KM

For 2x700MW Rajpura Thermal Power Plant400kV Line Protection.Rev:0

M/s. Alstom T&D India Limited,19/1, GST Road,

Pallavaram,Chennai - 600043.

53 KM0.02897 Ohm0.30720 Ohm0.30856 Ohm1.53541 Ohm

16.28160 Ohm16.35384 Ohm

84.58 Degree

12.5%315 MVA

2400 KV

63.49 Ohm

31.75 Ohm

2000 Amp1 Amp

400 Kilo Volt

CT & PT DetailsCT PrimaryCT SecondaryPT Primary

NO. OF ICT CircuitsVoltage rating

Impedance when 2 ICT's are connected in the circuit((KV)^2)/(2*MVA) x Percentage impedance

Pos.Seq. Resistance of Adj. Line per KMPos.Seq. Reactance of Adj. Line per KM

Impedance when one ICT is connected in the circuit((KV)^2)/(1*MVA) x Percentage impedance

ICT DETAILSICT impedance ICT rating

Positive Sequence Impedence for adj.line Positive sequence Impedence angle

Length of the adjacent line

Pos.Seq. Impedence of Adj. Line per KMPositive Sequence Resistance for adj.line Positive Sequence Reactance for adj.line




FOR REFERENCE ONLY

110 Volt0.55

0.811

-12.292 Degree

0.811-12.292 Degree

80% of protected line25% of parallel ICT Impedance

100% of parallel ICT Impedance10% of zone 1 impedence

VALUES

18.872 OhmVALUES

Grounding Factor kg = (Z0/Z1)/(3*Z1)

ZONE SETTING CALCULATIONSZONE 1 80% of Protected line (recommended) ZONE 2

DIST Z4

PT SecondaryCT/PT RatioGROUND FACTOR

DIST Z3 (100 of Protected line +

KZ1,KZ2,KZ3…..PS1Angle KgZONE SETTINGSDIST Z1DIST Z2 (100 of Protected line +

Magnitude of grounding factor Kg =(SQRT((X0-XL)*(X0-XL))+((R0-RL)*(R0-RL)))/ (3*(SQRT(RL*RL)+(XL*XL)))Angle of Grounding factor Kg = (arc Tan((X0-XL/(R0-RL)))-(arcTan(XL/RL))*180*7/22




28.087 Ohm27.955 Ohm

VALUES

32.584 Ohm32.320 Ohm

1.887 Ohm

2000 Amp

76.982 Ohm

42.340 Ohm25.404 Ohm25.404 Ohm25.404 Ohm33.872 Ohm33.872 Ohm33.872 Ohm

DIST R1,PG(Quad) (80% of RL)

DIST R3 & R4,PG(Quad) (80% of RL)OPERATING TIME DELAY

DIST R2,PG(Quad) (80% of RL)

Load Resistance (RL) in Secondary DIST R1,PP(Quad) (60% of RL) DIST R2,PP(Quad) (60% of RL) DIST R3 & R4,PP(Quad) (60% of RL)

100% of protected line + 50% of TransformerOn comparing the above values, the recommended value is the smallest of all values

10% of Zone 1 ImpedenceRESISTIVE REACH SETTING:

100% of protected line + 50% of Adjacent line

Primary full load current, CTR considered as Full load

Resistance at this current=(0.8*(PT Primary * 10^3) / (1.732) /(1.2*Primary full load current)

ZONE 3 100% of protected line + 100 % of longest line

ZONE 4

100% of protected line + 25% of TransformerOn comparing the above values, the recommended value is the smallest of all values




FOR REFERENCE ONLY

0.00 Sec0.30 Sec0.75 SEC1.00 SEC

20 % of R35.081 Ohm

20 % of R35.081 Ohm

POWER SWING SETTING:ΔR & ΔXΔR = 10 to 30% of Z3 R3,PPΔR = 10 to 30% of Z3 R3, PP

UNBLOCKING CURRENT THRESHOLDS:Unblocking stages using to trip if any fault when relay blocked on PSB

ΔX = 10 to 30% of Z3 R3, PP ΔX = 10 to 30% of Z3 R3, PP

The three unblocking current thresholds namely, IN>, I2> and Imax should be set above the maximum expected residualcurrent unbalance, the maximum negative sequence unbalance and the maximum expected power swing current.

Value of Imax line = 3 InomNOTE: PSB Block – Zone 2, Zone 3 & Zone 4

IN> 40%I2> 30 %

ZONE 3 OPERATING TIME(t3)ZONE 4 OPERATING TIME(t4)

ZONE 1 OPERATING TIME(t1)ZONE 2 OPERATING TIME(t2)




I>1 Current setting 3A

EARTHFAULT OVERCURRENT PROTECTIONIN>1 Function IDMT

tI>1 Time delay 1.2 sec

BACK UP OVER CURRENT: Enable Yes

I>3 Current Set 3.00AI>3 Time delay 3sec

DisabledTrip mode 1 pole Z1 , CR ReceivedSWITCH ON TO FAULTSwitch on to fault logic is pre-set in MiCOM P444

Operation on pick up of level detector method and activation of all zones is recommended.This time delay is not having rolein SOTF/TOR logic. Since not possible to block time delay, keep a higher setting as 3 Sec.

Unblocking timer:To be set to 2s typically to un block in case of a prolonged power swing. DISTANCE SCHEMES SETTING Program Mode Standard Scheme

I>4 Status Disabled

Standard Mode PUR Permissive under reach scheme Z1Ext Fail

PSB Allowed to trip – Zone 1




234601

Rectangle

FOR REFERENCE ONLYV>1 Voltage Set 121 V (110%)

Delta I> 100 mAOVER VOLTAGE PROTECTION:V> Measurement Mode Ph-Ph

VTS I2> & I0> Inhibit 50 mADetect 3P EnabledThreshold 3P U< 10 Volts

V>1 Function DT

DisabledBROKEN CONDUCTOR PROTECTIONI2/I1 ratio 0.20.

VT SUPERVISIONTime Set 60 Sec.

VTS Time Delay 5.000 s (alarm indication time )

IN>1 VTS Block Non DirectionalIN>1 Current set 0.2 AIN>1 Time Delay 1.2 secIN>1 Time VTSIN>2 status

1.2 sec

IN>1 Directional Directional Forward




V< Operation Any Phase

V<1 Pole Dead Inh Enabled

V<1 Voltage Set (80% of Nominal Voltage) 88 V (80%)V<1 Function DT

V<1 Time Delay 2 sec

V>2 Time Delay 1 sec

V>2 Status EnabledV>2 Voltage Set 154 V (140%)

V>1 Time Delay 2 sec

UNDER VOLTAGE PROTECTION:V< Mode Phase-Phase

V<2 Status EnabledV<2 Voltage Set (70% of Nominal Voltage) 77 V (80%)

Stub Bus Protection (50STB)Relay Type P444

V<2 Time Delay 0.5 sec

Pickup for Stub Bus in secondary 4.0 A

CT Secondary in Amps 1Settings:Stub Bus Enabled

CT Primary in Amps 2000




FOR REFERENCE ONLYdf/dt>1 Status

F>2 Time delay in sec

Under Frequency Protection

Over Frequency Protection

DF/DT Protection

df/dt>1 Setting in HzEnabled 0.250

1.5F>2 Status EnabledF>2 Setting in Hz

EnabledF<2 Setting in Hz 48

F>1 Status EnabledF>1 Setting in Hz 51.0

0.5

F>1 Time delay in sec

F<1 Status EnabledF<1 Setting in Hz 48.5

50.5

F<1 Time delay in sec 2

F<2 Time delay in sec 0.5

F<2 Status

Frequency Protection:Relay type used P141




df/dt>1 Time in sec

df/dt>2 Statusdf/dt>2 Setting in Hz

df/dt>2 Dir'n

0.200BothEnabled 0.300

Both

df/dt>1 Dir'n

Note: These settings of Frequency & DF/DT Protection are recommended based on general practice. These settings shall beadjusted if required as per the site conditions.These settings are applicable only if the protections are enabled in P442.

df/dt>2 Time in sec 0.200




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MiCOM P442 setting example