Overhead Line

7/25/2019 Overhead Line

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OVERHEAD LINE

IS 5613

Abstract of IS: 5613 (Part 1, 2, 3)

1) Ovr!a" L#$

Pole Foundation hole should be drilled in the ground with the use of earth-augers.

However, if earth-augers are not available a dog pit of the size I.2 x O.6 should be

ade in the dire!tion of the line.

"he depth of the pit shall be in a!!ordan!e-with the length of the pole to be planted in the

ground as given in respe!tive Indian #tandards.

2) %&b&'ar Po'

#teel "ubular Poles, $olled #teel %oists and $ails & ' suitable pad of !eent !on!rete,

stone or steel shall be provided at the botto of the pit, before the etalli! pole is

ere!ted.

(here etal wor)s are li)el* to get !orroded + points where the pole eerges out of the

ground , a !eent !on!rete uff, 2 ! above and 2 ! below the ground with sloping

top shall be provided.

3) R Po'

$ poles generall* have larger !ross-se!tion than the P poles and, therefore, the base

plates

or uffing are usuall* not provided for these t*pes of poles.

However, for P poles, a base plate + / x / x 0 ! !on!rete blo!) shall be provided.

eent !on!rete uff with sloping top a* also be provided, 2 ! above and 2 !

below-the ground level, when the ground or lo!al !onditions !all for the sae.

) H*V L#$ (12+ to 16+ S-a$)


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"he insulators should be atta!hed to the poles dire!tl* with the help of 13 t*pe or other

suitable !laps in !ase of verti!al !onfiguration of !ondu!tors or be atta!hed to the !ross

ars with the help of pins in !ase of horizontal !onfiguration

Pin insulator45 and re!oended for use on straight runs and up to axiu of 3

deviation.

"he dis! insulators are intended for use a pole positions having ore than 73 angle or for

dead ending of I )8 lines.

For lines having9, a bend of : to 73, either double !ross ars or dis! insulators should

be used for H" lines up to )8. For low and ediu voltage line, sha!)le insulatorsshould be used

For 8erti!al !onfiguration for ondu!tor ere!tion4

istan!e between Pole3s "op to is! insulation92.

;etween is! insulator to is! Insulator9.

;etween is! insulator to


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) 4&. I$s&'ator

#ta* wires and rods should be !onne!ted to the pole with a por!elain gu* insulator.

(ooden insulators should not be used. #uitable !laps should be used to !o@et sta*wires and rods to its an!hor.

For low and -ediu voltage lines a por!elain gu* insulator should be inserted in the

sta* wire at a height of 7 verti!all* above the ground level. For high voltage lines,

however, the sta*s a* be dire!tl*

an!hored.

) Sta. Stt#$0

"he in!lination of sta* relative to the ground is roughl* deterined before a)ing the

hole for ex!avation. "his enables the position of the sta* hole to be fixed so -that whenthe sta* is set, the

sta* rod will have the !orre!t in!lination and will !oe out of the ground at the !orre!tdistan!e fro the pole. "he sta* rods should be se!urel* fixed to the ground b* eans ofa suitable an!hor

1+) OH o$"&ctor Dr&

In loading, transportation and unloading !ondu!tor drus should be prote!ted against

inAur*. "he !ondu!tor drus should never be dropped and a* be "olled onl* asindi!ated b* the arrow on the dru side. "he drus should be distributed along the route

at distan!e approxiatel* eBual to the length of the !ondu!tor wound on the dru.

11) 7#$"#$0 of OH o$"&ctor

"he insulators should be bound with the line !ondu!tors with the help of !opper binding

wire in !ase

of !opper !ondu!tors, galvanized iron binding wire for galvanized iron !ondu!tors andaluinu binding wire or tape for aluinu and steel reinfor!ed aluinu !ondu!tors

+ '#$ . "he size of the binding wire shall not be 1less than 2 :

12) D#ffr$t Vo'ta0 o$ Sa S&--ort

(here !ondu!tors foring parts of s*stes at different voltages are ere!ted on the saesupports.

'deBuate !learan!e and guarding shall be provided Cto guard against the danger to

linean and others fro the lower voltage s*ste being !harged above its noral

wor)ing voltage b* lea)age fro or !onta!t with the higher voltage s*ste.


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"he !learan!e between the botto ost !ondu!tor of the s*ste pla!ed at the top and the

top ost !ondu!tor of the other s*ste should not be less than .2.

13) 8&-r

%upers fro dead end points on one side of the pole to the dead end side on the otherwide of the pole should be ade with !ondu!tor of sae aterial and !urrent !arr*ing

!apa!it* as that of the line !ondu!tor.

"he Aupers should be tied with the line !ondu!tor with a suitable !lap. If the aterial

of the Auper wire is different fro that of the line !ondu!tor, suitable bietalli! !laps

should be used. If !opper and aluinu bietalli! !laps are to be used, it should be

ensured that the aluinu !ondu!tor is situated above the !opper !ondu!tor so that no!opper !ontainated water !oes in !onta!t with aluinu.

1) 8&-r 'ara$c

For high voltage lines the Aupers should be so arranged that there is iniu !learan!e

of O.7 under axiu defle!tion !ondition due to wind between the live Aupers andother etalli! parts. "his a* involve ere!tion of insulators and dead weights spe!iall*

for fixing the Aupers.

15) 7#$"#$0 of OH L#$

Dength of ;inding wire on Insulator +Fro outer surfa!e if Insulator to end of binding

wire should be6D+(here 9iaeter of O?H ondu!tor

16) OH Patro''#$0

'll overhead lines should be patrolled periodi!all* at intervals not ex!eeding 7 onths

fro the ground when the line is live.

1) Po' Eart!#$0

'll etal poles in!luding reinfor!ed !eent !on!rete and pre-stressed !eent !on!rete

poles shall be peranentl* and effi!ientl* earthed.

For this purpose a !ontinuous earth wire shall be provided and se!urel* fastened to ea!hpole and !onne!ted with earth ordinaril* at 7 points in ever* )iloeter, the spa!ing

between the points being as nearl* eBuidistant as possible. 'lternativel* ea!h pole, andetalli! fitting atta!hed thereto shall be effi!ientl* earthed.

1) Sta. #r Eart!#$0


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'll sta* wires of low and ediu voltage lines other than those whi!h are !onne!ted

with earth b* eans of a !ontinuous earth wire shall have an insulator inserted at a height

of not less than 7 fro the ground.

1) Eart!#$0 /#r S#9

"he !ross-se!tional area of the earth !ondu!tor #is not be less than 6 2 if of

!opper, and 2= 2 if of galvanization or steel.

2+) o$"&ctor 'ara$c

Fixing ross 'r in Dow and @ediu 8oltage in Horizontal onfiguration4

PPN 'ara$c

Vo'ta0 Dscr#-t#o$ Ep to 6=8 Horizontal >8: #hape

ross ar4 +P-P+#treet

Dight-eutral

Phase to eutral90= ,Phase to Phase+#treetlight at "op of

Pole972=, Dast Phase-ross 'r

end9G

6=8 to 8 Horizontal rossar4 +P-P+#treet

Dight-

Phase-Phase97,Phase-Phase+#treet Dtg97,

Phase-eutral97,

Dast Phase-ross 'rend9G

Dow and

@ediu 8oltageDine

+Horizontal

onfiguration4

Dess than 0=! #ag+P-P 97 ! 06! to 2

! #ag +P-P9/= ! 2! to /= ! #ag +P-P96 !

Dow and

@ediu 8oltage

Dine

+8erti!al onfiguration4 Dess than 0! #ag+P-P 92 ! 0! to

! #ag +P-P97 !

High 8oltageDine

+Horizontalonfiguration4

Ep to 2! #ag+P-P 9/ ! /! to22=! #ag +P-P96= ! ouble ir!uit on

#ae Pole at ifferent Devel4 istan!e between

two ir!uit92 !

21) OH o$"&ctor

hoi!e of ondu!tors "he ph*si!al and ele!tri!al properties of different !ondu!tors

shall be in a!!ordan!e with relevant Indian #tandards. 'll !ondu!tors shall have a

brea)ing strength of not less than 7= )g.


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However, for low voltage lines with spans less than = and installed either on owner3s

or !onsuer3s preises, !ondu!tors with brea)ing strength of not less than / )g a*

be used.

22) Vo'ta0 Var#at#o$

In a!!ordan!e with the Indian Jle!tri!it* $ules voltage variation for low voltage lines

should not be ore than K 6 per!ent and for high voltage lines should not be ore than K6 per!ent to &L per!ent.

23) S-a$ (;- to 111;>(L?L5+)

(here 9#pa!ing between !ondu!tor+, E98oltage+p-p in )v,D9#pan in eter

2) 'ara$c (;- to 11


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66 8 #ingle 2/ @eter to 7= @eter

66 8 ouble 2/ @eter to 72 @eter

22 8 #ingle 72 @eter to 7G @eter

22 8 ouble 72 @eter to 7G @eter

26) Da$0r P'at(11


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L#$ Vo'ta0(


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Ep to /-etre span, one globule shall be provided in the iddle of the span on the

highest earth wire. In !ase of double earth wires, the globule a* be provided on an* one

of the. For span greater than /-etres, one additional globule a* be provided forever* additional 2-etre span or part thereof. Half orange and half white !olored

globule should be used.

32) Str&ct&r @ar#$0 (&- to ++


10/10

For /8 $oad rossing4 't all iportant !rossings, the towers shall be fitted with

noral suspension or tension insulator strings depending on the t*pe of towers but the

ground !learan!e at the roads under axiu teperature and in still air shall be su!hthat even with !ondu!tor bundle bro)en in adAa!ent span, the ground !learan!e of the

!ondu!tor fro the road surfa!e shall not be less than G3G/ eters.

't all national highwa*s tension towers shall be used. "he !rossing span, however, shall

not ex!eed 2= eters in an* !ase

Overhead Line

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