Subject:Project:Location:Client:-
DSLP Design Calculation 132/33kV KADUNA SUBSTATION KADUNA FEDERAL MINISTRY OF POWER DATE:- 15/5/2013
SYSTEM DATA Sl No.
1 2 3 4
Description Nominal System Voltage System Frequency Rated Impulse Withstand Vtg. Limiting Corona Gradient Strikes On Shield Wire IEEE 998-1996) (page 25Vc E0 k= 132 50 650 1500 1.2 Kv Hz Kv Kv/mt
Conductor Data Type Of Conductor( Single AAAC 800-D2-61) Sl No. Description
1 2 3
Diameter OF Conductor Number Of Conductors Sub Conductor Spacing Description
d= n= l=
0.0395 2 0.25
mt
mt
Installation Data
Sl No. 1 2
Height Of Installation above FGL Height of the Mast
h= H=
8.3 15.3
mt mt
Calculation The Equivalent Radius is given by (Rc) =Rcx ln(2 x h /R)-V/E=0 By solving the equation for Rc, we have Rc= Rc= 0.081704552 In Case Of A twin Conductor bundle ,the The Equivalent Radius is given by (R0) R0= ( r x l ) Ro= 0.070267347 The Radius of the bundle conductors under corona is= Rc'= Ro + Rc Rc'= 0.151971898 The surge impedace of conductors under corona is given as Zs= 60x{ln(2xh/R)xln(2xh/r)} Zs= 337.3141969 The allowable stroke current is obtained by the equation is Is= 2.2BIL/Zs Is= 4.239370928 BIL=Rated Lightning impulse withstand voltage Zs=Surge impedance of current carrying conductor
0.65 S= 8xk x Is S= 24.54805877
(EqnC.1-IEEE 998-1996)
mt
0.000848598
(Eqn. C.7-IEEE 998-1996)
OBJECT TO BE PROTECTED
Allowable Strike distance (S)= Height of the shield wire (H)= Height of the object to be protected(A)= 24.5480588 m 15.3 8.3 m m
Elevation difference between Shield wire and the Object to be protected(D)= D=H-A D= 7
Elevation difference between Origin of Rolling Sphere & Shield wire(E)= S-D E= 17.5480588 m
Horizontal distance between Origin of the Rolling Sphere & Shield wire(L)= ( S2 x E2 ) L= 17.1660369 m
Maximum allowable horizontal separation of the shield wires ensuring protection of object at height(X)= 2xL X= 34.33207379 m
0.01975
Subject:Project:Location:Client:-
DSLP Design Calculation 330/132kV KADUNA SUBSTATION KADUNA FEDERAL MINISTRY OF POWER DATE:-
SYSTEM DATA Sl No.
1 2 3 4
Description Nominal System Voltage System Frequency Rated Impulse Withstand Vtg. Limiting Corona Gradient Strikes On Shield Wire IEEE 998-1996) (page 25Vc E0 k=
Conductor Data Type Of Conductor( Single AAAC 800-D2-61) Sl No. Description
1 2 3
Diameter OF Conductor Number Of Conductors Sub Conductor Spacing Description
d= n= l=
Installation Data
Sl No. 1 2
Height Of Installation above FGL Height of the Mast
h= H=
Calculation The Equivalent Radius is given by (Rc) =Rcx ln(2 x h /R)-V/E=0 By solving the equation for Rc, we have Rc= Rc= 0.081704552 .
In Case Of A twin Conductor bundle ,the The Equivalent Radius is given by (R0) R0= ( r x l ) Ro= 0.070267347 The Radius of the bundle conductors under corona is= Rc'= Ro + Rc Rc'= 0.151971898 The surge impedace of conductors under corona is given as Zs= 60x{ln(2xh/R)xln(2xh/r)} Zs= 337.3141969 The allowable stroke current is obtained by the equation is Is= 2.2BIL/Zs Is= 4.239370928 BIL=Rated Lightning impulse withstand voltage Zs=Surge impedance of current carrying conductor
0.65 S= 8xk x Is S= 24.54805877
OBJECT TO BE PROTECTED
Allowable Strike distance (S)= Height of the shield wire (H)= Height of the object to be protected(A)= Elevation difference between Shield wire and the Object to be D= Elevation difference between Origin of Rolling Sphere & Shield Horizontal distance between Origin of the Rolling Sphere &E= Shield wire(L)= L= Maximum allowable horizontal separation of the shield wires X= 24.5480588 15.3 8.3 D=H-A 7 S-D 17.5480588 ( S2 x E2 ) 17.1660369 2xL
34.33207379
15/5/2013
132 50 650 1500 1.2
Kv Hz Kv Kv/mt
0.0395 2 0.25
mt mt
8.3 15.3
mt mt
(EqnC.1-IEEE 998-1996)
mt
0.000848598
given by (R0)
0.01975
(Eqn. C.7-IEEE 998-1996)
m m m m m m m
