180MW CO LOCATED SOLAR & WIND PROJECT -
SHIVA, OTTAPIDARAM, TAMILNADU
REV. NO. DATE DESCRIPTION PREPARED CHECKED APPROVED
0 12.06.2023 SUBMISSION FOR APPROVAL PVK SSE SM
1 15.06.2023 Revised based on Clients comments PVK SSE SM
OWNER: M/s.AMPLUS IRU POWER PRIVATE LIMITED
OWNER
CONSULTANT:
M/s.TATA CONSULTING ENGINEERS LIMITED
DEVELOPER M/s.EVERRENEW ENERGY PRIVATE LIMITED
DEVELOPER
CONSULTANT:- M/s.SRI SAI ENTERPRISES
PROJECT : 180MW CO LOCATED SOLAR & WIND PROJECT - SHIVA, OTTAPIDARAM, TAMILNADU
DOCUMENT NAME 110/33KV SUBSTATION DSLP CALCULATION
AMPLUS DOC. NO: 23105-EL-CAL-5002
EVERRENEW DOC. NO: AMP-ERW-TCS-OTP-ELE-DSN-03
REFERENCE DRAWING NO:- SUBMITTED FOR FOR APPROVAL DATE
PREPARED PVK 12.06.2023
23105-EL-DWG-5024 - SUB STATION PLAN & SECTION
CHECKED SSE 12.06.2023
LAYOUT
APPROVED SM 12.06.2023
180MW CO LOCATED SOLAR AND WIND PROJECT - SHIVA OTTAPIDARAM, DOCUMENT NO
PROJECT:
TAMILNADU
AMP-ERW-TCS-OTP-ELE-DSN-03
DESIGNED CHECKED APPD
TITLE: SUBSTATION - DSLP CALCULATION
PVK SSE SM
DIRECT STROKE LIGHTNING PROTECTION DESIGN FOR SWITCHYARD
1 I. Data for 110kV Switchyard
Height of Lightning mast (h) = 27.95 m (0.45+25+2.5)
Height of Tower with spike (h) = 16.65 m (0.45+9.2+5+2)
Height of the Live part to be protected:
110KV SIDE
a. Low Level Equipment Bus ( hx1 & 2 ) = 5.05 m
b. Main Bus ( hx3 ) = 9.65 m
33KV SIDE
c. Power Transformer ( hx4 ) = 7.45 m( max. Height Considered)
d. 33kVJack bus ( hx5 ) = 8.45 m
e. 33kV outgoing feeder ( hx6 ) = 7.45 m
f. 33kV Main Bus ( hx7 ) = 7.45 m
g. 33kV Equipment Bus ( hx8 ) = 4.00 m
2 METHODOLOGY
i) Single Lightning Mast
The radius of protective zone (rx) at height (hx), for single lightning mast of height 'h' < 30m
rx = 1.5 * h* (1 - hx / (0.8 *h)) : hx < 2/3 *h
The radius of protective zone (rx) at height (hx), for single lightning mast of height 'h' > 30 m,
rx = ρ * 1.5 * h * (1 - hx / (0.8 *h)) : hx < 2/3 *h where, ρ = 1
rx = ρ * 0.75 * h * (1 - hx / h) : hx > 2/3 *h where, ρ = 5.5 / sqrt (h)
180MW CO LOCATED SOLAR AND WIND PROJECT - SHIVA OTTAPIDARAM, DOCUMENT NO
PROJECT:
TAMILNADU
AMP-ERW-TCS-OTP-ELE-DSN-03
DESIGNED CHECKED APPD
TITLE: SUBSTATION - DSLP CALCULATION
PVK SSE SM
ii) Two Lightning Mast
The protective zone between two lightning masts have considerably greater dimensions
than the sum of protective zones of two single lightning masts. If two lightning masts are
located at a distance of S=7*ha*ρ, the point of ground surface which lies midway between
the two lightning mast will not be struck by lightning. In otherwords, a fictitious lightning
mast will be formed in between two lightning masts at midpoint with a height (Ho)
ho = h-S/7
The radius of protective zone (bx) at height (h0) for fictitious lightning mast
bx = 1.5 * ho * (1 - hx / (0.8 *ho)) : hx < 2/3 *ho
bx = 0.75 * ho * (1 - hx / ho) : hx > 2/3 *ho
for two lightning masts of height h > 30 m, point Ho is determined as
ho = h - S / 7ρ where, ρ = 5.5 / sqrt (h)
iii) Group of Lightning Masts
When the number of lightning mast is more than two, the internal part of the protective zone
of a number of lightning masts are not constructed. The external part of protective zone is
is determined in the same way as the protective zone of two lightning masts. An object of
hx situated inside the triangle or rectangle formed by the lightning masts will be protected
in case the diameter (D) of the circle passing through the tips of the lightning masts or
the diagonal of the rectangle at the corners of which the lightning masts are situated is not
greater than 8 times the active height (ha) of the lightning masts . i.e. h - hx
LEGEND:
Symbol Description Unit
h Height of Lightning Mast Meters
hx Height of Live part to be protected Meters
ha Active height of Lightning Mast Meters
s Actual distance between two LMs Meters
ρ Co- efficient for the LM height ρ = 5.5 / sqrt (h)
rx Protective radius Meters
S Allowable distance between two LMs Meters
D Allowable diagonal distance between two LMs Meters
ho Midway point protective height between two LMs Meters
bx Midway point protective distance between two LMs Meters
IV: Reference:
Direct stroke lightning protection calculation is based on the procedure given in "High
Voltage Engineering " by Prof. D.V.RAZEVIG
DIRECT STROKE LIGHTNING PROTECTION DESIGN FOR SWITCHYARD
Distance Allowable dist Allowable dia
Height of Height of Live Active Height Co- protective Midway point Midway point
Sl.No. Spike Reference between between dist between
Spike part of Spike efficient radius prot. ht. prot. Distance
Spikes LMs/Spikes LMs//Spikes
( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters)
(h) ( hx ) ( ha ) (s) (ρ) ( Rx ) (S) (D) ( ho ) ( Bx )
110kV SIDE (110kV Equipment Bus-Protected by Tower with spike)
1 16.65 5.05 11.60 S1 - S2 12.00 1.00 15.51 81.20 92.80 14.94 12.93
2 16.65 5.05 11.60 S3 - S4 12.00 1.00 15.51 81.20 92.80 14.94 12.93
3 16.65 5.05 11.60 S1 - S5 21.50 1.00 15.51 81.20 92.80 13.58 10.90
4 16.65 5.05 11.60 S4 - S7 21.50 1.00 15.51 81.20 92.80 13.58 10.90
5 16.65 5.05 11.60 S5 - S6 14.00 1.00 15.51 81.20 92.80 14.65 12.51
6 16.65 5.05 11.60 S6 - S7 14.00 1.00 15.51 81.20 92.80 14.65 12.51
7 16.65 5.05 11.60 S5 - S8 12.00 1.00 15.51 81.20 92.80 14.94 12.93
8 16.65 5.05 11.60 S8 - S9 14.00 1.00 15.51 81.20 92.80 14.65 12.51
9 16.65 5.05 11.60 S9 - S10 14.00 1.00 15.51 81.20 92.80 14.65 12.51
10 16.65 5.05 11.60 S10 - S7 12.00 1.00 15.51 81.20 92.80 14.94 12.93
110kV SIDE (110kV Equipment Bus-Prtected by LCLM-1)
1 27.95 5.80 22.15 LCLM-1 - 1.00 31.05 - - - -
110kV SIDE (110kV Main Bus-Prtected by Tower with spike)
1 16.65 9.65 7.00 S5 - S6 14.00 1.00 6.88 49.00 56.00 14.65 3.88
2 16.65 9.65 7.00 S6 - S7 14.00 1.00 6.88 49.00 56.00 14.65 3.88
3 16.65 9.65 7.00 S5 - S8 12.00 1.00 6.88 49.00 56.00 14.94 4.31
4 16.65 9.65 7.00 S8 - S9 14.00 1.00 6.88 49.00 56.00 14.65 3.88
5 16.65 9.65 7.00 S9 - S10 14.00 1.00 6.88 49.00 56.00 14.65 3.88
6 16.65 9.65 7.00 S10 - S7 12.00 1.00 6.88 49.00 56.00 14.94 4.31
3
DIRECT STROKE LIGHTNING PROTECTION DESIGN FOR SWITCHYARD
Distance Allowable dist Allowable dia
Height of Height of Live Active Height Co- protective Midway point Midway point
Sl.No. Spike Reference between between dist between
Spike part of Spike efficient radius prot. ht. prot. Distance
Spikes LMs/Spikes LMs//Spikes
( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters) ( Meters)
(h) ( hx ) ( ha ) (s) (ρ) ( Rx ) (S) (D) ( ho ) ( Bx )
33kV SIDE (Bus Height <=8.45M -Protected by Tower with spike)
1 27.95 8.45 19.50 LCLM-1 to LCLM-2 59.11 1.00 26.08 136.50 156.00 19.51 13.41
2 27.95 8.45 19.50 LCLM-2 to LCLM-3 52.34 1.00 26.08 136.50 156.00 20.47 14.87
3 27.95 8.45 19.50 LCLM-3 to LCLM-1 64.07 1.00 26.08 136.50 156.00 18.80 12.35
33kV SIDE (33kV LA-Prtected by LCLM-1)
1 27.95 9.00 18.95 LCLM-1 - 1.00 25.05 - - - -
