1

No.

17.10.06 For Approval

DATE

REMARKS

CHKD

APPD

REVISION

RELOCATION OF RIYAM 33/11 KV SUBSTATION AND

TRANSFORMER REPAIR SHOP

LARSEN & TOUBRO LIMITED

ECC - Division EDRC
PROJECT :
DSND

RELOCATION OF RIYAM 33/11 KV SUBSTATION AND

TRANSFORMER REPAIR SHOP
TITLE :

SCALE

SIGN

DATE

PVR

16.10.06

DRWN

CHKD

AKS

17.10.06

APPD

AKS

17.10.06

DRG.No.

CODE

RELAY SETTING CALICULATIONS FOR DISTANCE PROTECTION

06102-E-SY-33-DC-021D

REV.
1

CODE

RELAY SETTING CALICULATIONS FOR DISTANCE PROTECTION

06102-E-SY-33-DC-021D

Directional Relay Setting Calculation

Relay Details
Make of the relay
Type of Relay

:
:

Siemens
7Sj6211

System Data
System Voltage

33

System Grounding

Resistence Grounding

Name of the Protected Line

Length of the UG Cable

:
:

33kV SIP-B
5.500

Kms

CT Pri

400

Amps

CT Sec

Amps

33kV Grade,

3Cx300 sq..mm. XLPE

Positive Seq. Resistance

Positive Seq. Reactance

:
:

0.079
0.103

Ohms/Km
Ohms/Km

Zero seq. Resistance

0.2370

Ohms/Km

(assumed three times of Positive

Zero seq. Reactance

0.3090

Ohms/Km

sequence values)

Cable impedance per unit length

:
:

Cable length (for each Incomer)

5.5

Total cable impedance

0.4345 + J0.5665

kV

CT details
CT raito at TAPP End

Cable Parameters
Cable type and size

Z cab

Source Bus

Source X/R ratio

(X/R)

(Using empirical formula)

0.0790 +j 0.1030 Ohm/km

km
Ohm

33kV
Vsys / 6

:
: 5.5

Base MVA

: 1 MVA
: Vsys2/G

Base impedance (1 MVA Zbase

: 1089 Ohm
Source impedance (in pu)

Zs

: 1/ [1 .732 x 33 x 25]

Source impedance (in Ohm)

0.0006998 Pu

zs(in Pu) x Zbase

i.e..; (R +] X) format Zs

0.760122

Zs x (cos (tan-1(X/R)s) +j sin (tan-1((X/R)s)

:

0.1365 + j0.7498 Ohm

Source impedence

Zs

0.1365 + j0.7498 Oh ohm

Grounding Resistence

Rn

19.00

(Zcab)+50 % of (Zcab)

0.4345 + J0.5665 + 50% of 0.4345 + J0.5665

0.65175 +

ohm

(Assumed)

considered fault at 50% of the line

Z1L

J0.84975ohm

Z2L

ZsL

50 % of (Zcab)

0.21725 +

Z1L*Z2L/(Z1L+Z2L)

0.162+J0.212 ohm

J0.28325ohm

phase- phase fault current

Zs1

Zs+ZsL

:
:

(0.1365 + j0.7498 Ohm) + (0.162+J0.212)

0.2985 +j 0.961ohm

Zs2

0.2985 +j 0.9618 ohm

Zs0

0.8955 + j 2.8854

V/(Zs1+Zs2)

16.384

KA

16.4

KA (approx)
Degrees

ph- ph fault current

(33000/(Zs1+Zs2)

ph- ph fault current angle

72.75

Then current I1

Iph*Z2L/Z1L+Z2L

4.13

(considered same as Zs1)

ohm

KA (approx)

however 90% is condidered for effective pick up

: 3.717
KA
CT secondry side current
(3.717/400)

9.3

Recommanded setting

9.3

72.75

Degrees

ph- ph I1 fault current angle :

Phase -earth fault current

Earth fault current
Zs1+Zs2+Zs0+3Rn

1.732*V/(Zs1+Zs2+Zs0+3Rn)

58.495+j 4.809

1.732*33000/(Zs1+Zs2+Zs0+3Rn) :

Then current I1

CT secondry side current

(242/400)

ohm

973

amp

1.000

KA (approx)

Iph-e *Z2L/Z1L+Z2L

242

A (approx)

0.605

Howevr for ensure better sensitivity the relay is set 20%of ct primary (i.e 0.2*400=80)
:

0.2

Recommanded settings

0.2

ph - earth I1 fault current angle

72.75

Degrees

(considered Zs0= 3 times Zs1)

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings

Comments

67/67-TOC

Disabled
Definite Time only
Time Overcurrent Curve IEC
Time Overcurrent Curve ANSI
User Defined Pickup Curve
User Defined Pickup and Reset
Curve

Definite Time only

67, 67-TOC

116

67N/67N-TOC

Disabled
Definite Time only
Time Overcurrent Curve IEC
Time Overcurrent Curve ANSI
User Defined Pickup Curve
User Defined Pickup and Reset
Curve

Definite Time only

67N, 67N-TOC

1501

FCT 67/67-TOC

OFF ON

on

67, 67-TOC Phase Time Over-current

1513A

MANUALCLOSE-MODE

67-2 instantaneously 67-1 instantaneously

67-TOC instantaneously Inactive

67-2 instantaneously

Manual Close Mode

1515A

Normal Load

Inductive (135) Resistive (90) Capacitive(45)

Inductive (135)

Normal Load (Torque angle of dir. fct)

1516

67 Direction

Forward Reverse

Forward

phase direction

1601

FCT 67N/67N-TOC

OFF ON

on

67N, 67N-TOC Ground Time Overcurrent

1613A

MANUALCLOSE-MODE

67N-2 instantaneously 67N-1 instantaneously

67N-TOC instantaneously Inactive

67N-2 instantaneously

Manual Close Mode

1615A

Normal Load

Inductive (135) Resistive (90) Capacitive(45)

Resistive (90)

Manual Close Mode

1616

67N Direction

Forward Reverse

Forward

ground direction

1502

67-2 PICKUP

0.10..35.00 A;

9.3

67-2 Pickup

1503

67-2 DELAY

0.00..60.00 sec;

0.5 sec

67-2 Time Delay

1504

67-1 PICKUP

0.10..35.00 A;

9.3

67-1 Pickup

1505

67-1 DELAY

0.00..60.00 sec;

0.50 sec

67-1Time Delay

1514A

67 active

with 79 active always

always

67 active

1507

67-TOC PICKUP

0.10..4.00 A

67-TOC Pickup

150

67 TIME DIAL

0.05..3.20 sec;

67-TOC Time Dial

1509

67 TIME DIAL

0.50..15.00;

67-TOC Time Dial

1510

67-TOC Drop-out

Instantaneous Disk Emulation

Drop-Out Characteristic

115

Remarks

Greater then zone 2 time settings

NOT APPLICABLE TO OUR SYSTEM

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings
-

Comments

Remarks

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings

Comments

1511

67-IEC CURVE

Normal Inverse Very Inverse

Extremely Inverse Long Inverse

Inverse IEC Curve

1512

67-ANSI CURVE

Very Inverse Inverse Short Inverse Long Inverse

Moderately Inverse Extremely Inverse Definite Inverse

IEC Curve

1530

67

1.00..20.00 I / Ip; ? 0.01..999.00 Time Dial

67

1531

MofPU Res T/Tp

0.05..0.95 I / Ip; ? 0.01..999.00 Time Dial

1602

67N-2 PICKUP

0.05..35.00 A;

0.2 A

67N-2 Pickup

1603

67N-2 DELAY

0.00..60.00 sec;

0.5

67N-2 Time Delay

1604

67N-1 PICKUP

0.05..35.00 A;

0.20 A

67N-1 Pickup

1605

67N-1 DELAY

0.00..60.00 sec;

0.50 sec

67N-1 Time Delay

1614A

67N active

always with 79 active

always

67N active

1607

67N-TOC PICKUP

0.05..4.00

67N-TOC Pickup

160

67N-TOC T-DIAL

0.05..3.20 sec;

67N-TOC Time Dial

1609

67N-TOC T-DIAL

0.50..15.00;

67N-TOC Time Dial

1610

67N-TOC RESET

Instantaneous Disk Emulation

Drop-Out Characteristic

1611

67N-TOC IEC

Normal Inverse Very Inverse

Extremely Inverse Long Inverse

Inverse IEC Curve

1612

67N-TOC ANSI

Very Inverse Inverse Short Inverse Long Inverse

Moderately Inverse Extremely Inverse Definite Inverse

IEC Curve

1630

M.of PU TD

1.00..20.00 I / Ip; 0.01..999.00 Time Dial

Multiples of PU Time-Dial

1631

I/IEp Rf T/TEp

0.05..0.95 I / Ip; 0.01..999.00 Time Dial

67N TOC

Remarks

Multiple of Pickup <-> T/Tp

NOT APPLICABLE TO OUR SYSTEM

Directional Relay Setting Calculation

Relay Details
Make of the relay
Type of Relay

:
:

Siemens
7Sj6211

System Data
System Voltage

11

System Grounding

Solid Grounding

CT Pri

1200

Amps

CT Sec

Amps

11.055

KA (approx)

kV

CT details
CT raito at TAPP End
3- phase fault current

3- phase fault current

(Refer ETAP Reults of phase -phase faults at bus -5)

however 90% is condidered for effective pick up

: 9.9495
KA
CT secondry side current

8.3

8.3

12.124

KA

10.11

(9.9495/1200)
Recommanded setting

Phase -earth fault current

phase- ground fault current
(Refer ETAP Reults of phase - ground faults at bus -5)

CT secondry side current

(12.124/1200)

Howevr for ensure better sensitivity the relay is set 20%of ct primary (i.e 0.2*1200=240)

Recommanded settings

0.2

ph - earth I1 fault current angle

72.75

Degrees

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings

Comments

67/67-TOC

Disabled
Definite Time only
Time Overcurrent Curve IEC
Time Overcurrent Curve ANSI
User Defined Pickup Curve
User Defined Pickup and Reset
Curve

Definite Time only

67, 67-TOC

116

67N/67N-TOC

Disabled
Definite Time only
Time Overcurrent Curve IEC
Time Overcurrent Curve ANSI
User Defined Pickup Curve
User Defined Pickup and Reset
Curve

Definite Time only

67N, 67N-TOC

1501

FCT 67/67-TOC

OFF ON

on

67, 67-TOC Phase Time Over-current

1513A

MANUALCLOSE-MODE

67-2 instantaneously 67-1 instantaneously

67-TOC instantaneously Inactive

67-2 instantaneously

Manual Close Mode

1515A

Normal Load

Inductive (135) Resistive (90) Capacitive(45)

Inductive (135)

Normal Load (Torque angle of dir. fct)

1516

67 Direction

Forward Reverse

Forward

phase direction

1601

FCT 67N/67N-TOC

OFF ON

on

67N, 67N-TOC Ground Time Overcurrent

1613A

MANUALCLOSE-MODE

67N-2 instantaneously 67N-1 instantaneously

67N-TOC instantaneously Inactive

67N-2 instantaneously

Manual Close Mode

1615A

Normal Load

Inductive (135) Resistive (90) Capacitive(45)

Resistive (90)

Manual Close Mode

1616

67N Direction

Forward Reverse

Forward

ground direction

1502

67-2 PICKUP

0.10..35.00 A;

8.3

67-2 Pickup

1503

67-2 DELAY

0.00..60.00 sec;

0.5 sec

67-2 Time Delay

1504

67-1 PICKUP

0.10..35.00 A;

8.3

67-1 Pickup

1505

67-1 DELAY

0.00..60.00 sec;

0.50 sec

67-1Time Delay

1514A

67 active

with 79 active always

always

67 active

1507

67-TOC PICKUP

0.10..4.00 A

67-TOC Pickup

150

67 TIME DIAL

0.05..3.20 sec;

67-TOC Time Dial

1509

67 TIME DIAL

0.50..15.00;

67-TOC Time Dial

1510

67-TOC Drop-out

Instantaneous Disk Emulation

Drop-Out Characteristic

115

Remarks

Greater then zone 2 time settings

NOT APPLICABLE TO OUR SYSTEM

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings
-

Comments

Remarks

RECOMANDED SETTINGS
Addr.

Setting Title

Setting Options

Recommanded Settings

Comments

1511

67-IEC CURVE

Normal Inverse Very Inverse

Extremely Inverse Long Inverse

Inverse IEC Curve

1512

67-ANSI CURVE

Very Inverse Inverse Short Inverse Long Inverse

Moderately Inverse Extremely Inverse Definite Inverse

IEC Curve

1530

67

1.00..20.00 I / Ip; ? 0.01..999.00 Time Dial

67

1531

MofPU Res T/Tp

0.05..0.95 I / Ip; ? 0.01..999.00 Time Dial

1602

67N-2 PICKUP

0.05..35.00 A;

0.2 A

67N-2 Pickup

1603

67N-2 DELAY

0.00..60.00 sec;

0.5

67N-2 Time Delay

1604

67N-1 PICKUP

0.05..35.00 A;

0.20 A

67N-1 Pickup

1605

67N-1 DELAY

0.00..60.00 sec;

0.50 sec

67N-1 Time Delay

1614A

67N active

always with 79 active

always

67N active

1607

67N-TOC PICKUP

0.05..4.00

67N-TOC Pickup

160

67N-TOC T-DIAL

0.05..3.20 sec;

67N-TOC Time Dial

1609

67N-TOC T-DIAL

0.50..15.00;

67N-TOC Time Dial

1610

67N-TOC RESET

Instantaneous Disk Emulation

Drop-Out Characteristic

1611

67N-TOC IEC

Normal Inverse Very Inverse

Extremely Inverse Long Inverse

Inverse IEC Curve

1612

67N-TOC ANSI

Very Inverse Inverse Short Inverse Long Inverse

Moderately Inverse Extremely Inverse Definite Inverse

IEC Curve

1630

M.of PU TD

1.00..20.00 I / Ip; 0.01..999.00 Time Dial

Multiples of PU Time-Dial

1631

I/IEp Rf T/TEp

0.05..0.95 I / Ip; 0.01..999.00 Time Dial

67N TOC

Remarks

Multiple of Pickup <-> T/Tp

NOT APPLICABLE TO OUR SYSTEM