dslp calculation by vikas

DOCUMENT COVER SHEET

Direct Stroke Lightning Protection Calculation

400 / 220 / 33kV Indrapuram Substation

0 27.11.12Rev. Date Description PREPARED BY Checked By Approved By

PROJECT :

NAME DATE DOCUMENT STATUS DOCUMENT TITLE SHEET SIZE

VIK 27.11.12 A4

For Construction

As Built DOCUMENT NO. NO. OF SHEETS

COVER + 06

Western Uttar Pradesh Power Transmission Corporation Limited

S-3, 2nd Floor,Aditya Mega Mall,Indirapuram,Ghaziabad 201010,

Megha Engineering and Infrastructure Limited

7th floor Tower c Building No. 10 DLF Cyber city phase-II Gurgaon India

765/400 kV Intra - State Transmission Project.

PREPARED BY

For Approval

Direct Stroke Lightning Protection Calculation

CHECKED BY

APPROVED BY

Substation Name Document Name Document No.

TABLE OF CONTENTS

CLAUSE NO. DESCRIPTION SHEET NO.

1.0 PURPOSE 2

2.0 CODES & STANDARDS 2

3.0 SIZING CRITERIA 2

4.0 FORMULAE USED FOR CALCULATIONS 3

5.0 CALCULATION 4

6.0 CONCLUSION 6

Sheet No. 1 of 6

400/220/33kV Indrapuram Substation

Direct stroke lightning protection Calculations


1.0 PURPOSE:

2.0 CODES & STANDARDS:

a) High Voltage Engineering by " Prof.Razevig"

3.0 SIZING CRITERIA:

3.1 The height of Lightning Masts depend on the

a) Height of the equipment to be protected.

b) Area to be protected.

3.2 Data for 400KV Switchyard:

a) Height of Lightning mast h 40 m

b) Height of the livepart to be protected: hx 10 m

All the heights has taken from the plinth level.









SHEET NO. 2 OF 6

400/220/33 KV Indrapuram Substation


The purpose of this calculation is to determine the height of Lightning Masts for 400/220/33 kV Indrapuram Substation.




4.0 Formulae Used:

A Protective radius (rx) :

1 If , hx <= (2/3)h and h > 30m:-

2 If , hx <= (2/3)h and h <= 30m:-

3 Co-efficient for the Lightning Mast Height P m

4 Allowable distance between two LMs S 7 x ha x P m m

5 Allowable diagonal distance between two LMs D 8 x ha x P m m

Where ha= h - hx m

B Midway point protective Height (ho) and Midway Point Protective Distance (bx)

1 m

2 If hx < (2/3)ho and ho > 30 m :- m

3 If hx < (2/3)ho and ho < 30 m :- m

4 If hx > (2/3)ho and ho < 30 m :- m

P

Shh

7 0

r x=1 .5h×(1− hx0 . 8h )× P m

r x=1 .5h×(1− hx0 .8h ) m

5 .5/ √h

bx=1. 5ho×(1− hx0 .8ho )×P

bx=1.5ho×(1− hx0 .8ho )

bx=0 .75ho×(1−hxho )




SHEET NO. 3 OF 6




5.0 Calculation

a) For LM1

Height of the LM h 40 m

Height to be protected 10 m

Protective radius

P =

0.870

Protective radius

=

35.8875 m

Hence protection area of LM1 covers the 400 kV Substation area which have to be protected.

b)For LM2 & LM3



Protective radius

P =

0.870

hx

5.5 / Öh

5.5/Ö40

1.5 X 40((1-(10/0.8 x 40))x0.870

hx

5.5 / Öh

5.5/Ö40

r x=1 .5h×(1− hx0 . 8h )× P m

r x=1 .5h×(1− hx0 . 8h )× P m

r x=1 .5h×(1− hx0 . 8h )× P m




SHEET NO. 4 OF 6




Protective radius

=

42.4125 m

Hence protection area of LM1 & LM2 covers the 220 kV Substation area which have to be protected.

c) For LM4



Protective radius

P =

0.870

Protective radius

=

44.04375 m

Hence protection area of LM4 covers the 33 kV Substation area which have to be protected.

1.5 X 40((1-(6/0.8 x 40))x0.870

hx

5.5 / Öh

5.5/Ö40

1.5 X 40((1-(5/0.8 x 40))x0.870

r x=1 .5h×(1− hx0 . 8h )× P m

r x=1 .5h×(1− hx0 . 8h )× P m

r x=1 .5h×(1− hx0 . 8h )× P m




SHEET NO. 5 OF 6


Table

S.No. LM Protection area

1 LM1 40 10 35.8875 400 kV Switchyard area2 LM2 40 6 42.4125 220 kV Switchyard area3 LM3 40 6 42.4125 220 kV Switchyard area4 LM4 40 5 44.04375 33 kV Switchyard area

Hence from the above calculated protection area of LM1,LM2,LM3 and LM4 we can protect the indrapuramswitch yard area from the direct lightning.

SHEET NO. 6 OF 6



Height of LM(m)

Height of the equipment to be protected.(m)

Radius of LM(m)

Conclusion

dslp calculation by vikas

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