Rel511 Settings

distance relay calculation for REL 511 FOR TANTA WEST - PATROOL

zyateast

patrool

17km ,400 mm² ,ASCR

tanta west

2.7km,400mm²,ascr

PROTECTED LINE DATA C.T.R P.T.R U.Z.R

400 66000

5 100

LINE IMPEDANCE Z1 = R1+ JX1 R1s Z0 = R0 +JX0 R0

SHORTEST LINE

80 660 0.121212

Z1 Z0

L KM 0.026836 0.170182

0.111927 0.798545

L KM

0.16897

XL2

LONGEST LINE patrool-zyateast RL3

0.342 2.44

2.7 X1s X0

patrool-zyateast RL2

0.082 0.52

17

0.704727

ROL2 1.071515

L KM

0.16897

XL23

XOL2 5.027879

17 R0L3 1.071515

0.704727

X0L3 5.027879

the fault resistance setting shall be limited to the max. load is given to 45.7248 MVA 66 AT ph.ph fault the fault resistance is equal to the arc resistance between the faulted phases . By the use of the van warring formula the max. arc resistance can be estimated the max . Short circuit current 1000 arc length m 5 Rarc= 28700*L arc/( Iarc)^ 1.4 9.054238 Rarc sec 1.097483 R arc ph.ph = 1.097483 at phase to earth fault is equal to the arc resistance between the faulted phase and earth added with the effective twoer footing resistance l arc m 10 if there is earthed wire connecting each tower to each other the effective footing resistance can be considered less than 10 ohm R FOOT 10 1.212121 Rarc ph.e = 2.309605 Rarc + R foot ZONE 1 FORWARD R1 0.022811 X1 0.095138 R0E 0.144655 X0E 0.678764 RF= < 3*X1 RF= 0.285415 RFn= 120%XL resistive reach Rzone 2 = R1 +0.5 *RL2

0.464291

R0E2=R0+0.5*R0L2 X0E2=X0+0.5*X0L2 RF =