Protection

Interposing CT Connections in 3-ph Tr

CT1 Yyo

Yyo

dy11

IPCT1

IPCT2

Differential Relay

Yyo

CT2 Yyo

Yd1

Programmed By: Eng.Mohammad Al-Fayoumi

Rating MVA 75

Up to 85MVA

Tr Connection yd1 400/1

I1

Voltage KV 132 33

328.04

1500/1

0.820

INTERPOSING IPCT to identify phase shift TRANSFORMER

IPCT to identify phase shift

0.820

Differential Relay

C.B Status

Not Trip

The Differential Relay Settings " with 2 biased input" I1

I2

0.820

0.875

F.T.P 0.2

S.T.P 0.6

Ibias 0.85

C/C 20%Slope C.B Status Not Trip F.T.P S.T.P

First Turning Point Second Turning Point

Standards CT's 200/1 200 300/1 300 400/1 400 500/1 500 800/1 800 1200/1 1200 1500/1 1500

I2 1312.16

0.875

IPCT to identify phase shift

0.875

th 2 biased input" IN 1

Programmed By: Eng.Mohammad Al-Fayoumi

CT Ratio 800 /1

IR IY IB IN

800.00

R Y

800 -400-692.820323027551i -425+736.121593216773i Err:502

800.00 O\C Red Relay Setting

B 850.00

Iline

Isetting

800

1

T.M.S 0.25

1 O\C Blue Relay Setting IN Err:502

1.06

Iline

Isetting

850

1

T.M.S 0.25

E\F Relay Setting

Earth Fault

Over Current

Over Current

IN

Isetting

Err:502

0.1

T.M.S 0.2

S.E\F Relay Setting

Err:502 Err:502 Err:502

Trip 28.85 sec

Not-Trip Not operate

IN

Isetting

Err:502

0.03

C.B Status Time

T.M.S 6

Programmed By: Eng.Mohammad Al-Fayoumi

-400-692.820323027551i -425+736.121593216773i Err:502

C\C si

C\C si

C\C si

C\C Dt

Programmed By: ng.Mohammad Al-Fayoumi

Bus A

Rated Voltage KV 120 800 /1

1.88

132000 /110 100.00

Distance Relay

Time

Trip on Z3 0.8 sec

Fault Locate (Km) 84.25

(Ang) 78

Current (Abs) 1500

Current (Ang) 40

Line Length Km 100

Line Resistance 0.09 Ω/Km Line Reactance 0.39 Ω/Km

Line Impedance 8.998+38.975i

Distance Relay Settings Zsetting Zone T.M.S Z1 32 ins Z2 48 0.4 Z3 60 0.8

Bus B

elay Settings C\C ins Dt Dt

Programmed By: Eng.Mohammad Al-Fayoumi