Download MiCOM P442 setting example PDF

TitleMiCOM P442 setting example
Tags Electricity Electrical Resistance And Conductance Relay Electrical Impedance
File Size651.7 KB
Total Pages5
Document Text Contents
Page 1

FO
R R

EFE
REN

CE
ON

LY

139 KM
0.02897 Ohms
0.30720 Ohms
0.30856 Ohms
0.25697 Ohms
1.02230 Ohms
1.05410 Ohms
4.02683 Ohm

42.70080 Ohm
42.89025 Ohm

84.58 Degree
35.71883 Ohm
142.0997 Ohm
146.5202 Ohm

75.86 Degree
Zero Sequence Impedence for Protected line
Zero Sequence Impedence Angle

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

Positive Sequence Impedence for Protected line
Positive sequence Impedence angle

Positive Sequence Resistance for Protected line
Positive Sequence Reactance for Protected line

Zero Sequence Resistance for Protected line
Zero 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 line
Positive Sequence Resistance per KM
Positive Sequence Reactance per KM

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

53 KM
0.02897 Ohm
0.30720 Ohm
0.30856 Ohm
1.53541 Ohm

16.28160 Ohm
16.35384 Ohm

84.58 Degree

12.5%
315 MVA

2
400 KV

63.49 Ohm

31.75 Ohm

2000 Amp
1 Amp

400 Kilo Volt

CT & PT Details
CT Primary
CT Secondary
PT Primary

NO. OF ICT Circuits
Voltage 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 KM
Pos.Seq. Reactance of Adj. Line per KM

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

ICT DETAILS
ICT 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 KM
Positive Sequence Resistance for adj.line
Positive Sequence Reactance for adj.line

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

Page 2

FO
R R

EFE
REN

CE
ON

LY

110 Volt
0.55

0.811

-12.292 Degree

0.811
-12.292 Degree

80% of protected line
25% of parallel ICT Impedance

100% of parallel ICT Impedance
10% of zone 1 impedence

VALUES

18.872 Ohm
VALUES

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

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

DIST Z4

PT Secondary
CT/PT Ratio
GROUND FACTOR

DIST Z3 (100 of Protected line +

KZ1,KZ2,KZ3…..PS1
Angle Kg
ZONE SETTINGS
DIST Z1
DIST 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)))-(arc
Tan(XL/RL))*180*7/22

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

28.087 Ohm
27.955 Ohm

VALUES

32.584 Ohm
32.320 Ohm

1.887 Ohm

2000 Amp

76.982 Ohm

42.340 Ohm
25.404 Ohm
25.404 Ohm
25.404 Ohm
33.872 Ohm
33.872 Ohm
33.872 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 Transformer
On comparing the above values, the recommended value is the smallest of all values

10% of Zone 1 Impedence
RESISTIVE 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 Transformer
On comparing the above values, the recommended value is the smallest of all values

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

Page 3

FO
R R

EFE
REN

CE
ON

LY

0.00 Sec
0.30 Sec
0.75 SEC
1.00 SEC

20 % of R3
5.081 Ohm

20 % of R3
5.081 Ohm

POWER SWING SETTING:
�dR & �dX
�dR = 10 to 30% of Z3 R3,PP
�dR = 10 to 30% of Z3 R3, PP

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

�dX = 10 to 30% of Z3 R3, PP
�dX = 10 to 30% of Z3 R3, PP

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

Value of Imax line = 3 Inom
NOTE: 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)

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

I>1 Current setting 3A

EARTHFAULT OVERCURRENT PROTECTION
IN>1 Function IDMT

tI>1 Time delay 1.2 sec

BACK UP OVER CURRENT:
Enable Yes

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

Disabled
Trip mode 1 pole Z1 , CR Received
SWITCH ON TO FAULT
Switch 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 role
in 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

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

234601
Rectangle

Page 4

FO
R R

EFE
REN

CE
ON

LY
V>1 Voltage Set 121 V (110%)

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

VTS I2> & I0> Inhibit 50 mA
Detect 3P Enabled
Threshold 3P U< 10 Volts

V>1 Function DT

Disabled
BROKEN CONDUCTOR PROTECTION
I2/I1 ratio 0.20.

VT SUPERVISION
Time Set 60 Sec.

VTS Time Delay 5.000 s (alarm indication time )

IN>1 VTS Block Non Directional
IN>1 Current set 0.2 A
IN>1 Time Delay 1.2 sec
IN>1 Time VTS
IN>2 status

1.2 sec

IN>1 Directional Directional Forward

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

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 Enabled
V>2 Voltage Set 154 V (140%)

V>1 Time Delay 2 sec

UNDER VOLTAGE PROTECTION:
V< Mode Phase-Phase

V<2 Status Enabled
V<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 1
Settings:
Stub Bus Enabled

CT Primary in Amps 2000

For 2x700MW Rajpura Thermal Power Plant
400kV Line Protection.
Rev:0

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

Pallavaram,
Chennai - 600043.

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