11KV415V Overhead Line Specification(REC)

8/12/2019 11KV415V Overhead Line Specification(REC)

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11KV/415V Overhead Line Specification(REC)

June 8, 2011 22 Comments

11KV/415V over Head Lines Specification and nsta!!ation as per REC"

11KV L#H$%%# &RRES$ER (S" ' (*t+)),

Vo!ta-e Ratin-"

The rated voltage of lightning arresters shall be 9 KV (rms)

This !ill be a""li#able to the effe#tivel$ earthed 11 KV s$stems #o%effi#ient of

earth not eeeding 80 "er#ent as "er ' *00* !ith all the transformer

neutrals dire#tl$ earthed

%or.a! ischar-e C0rrent Ratin-"

The nominal dis#harge #urrent rating of the lightning arresters shall be + K

$ests"

The follo!ing routine and t$"e tests as laid do!n in ' -0.0 (/art%') shall be

#arried out

outine Test r$ /o!er freuen#$ s"ar3 over test

T$"e Tests (Confirmation)

1 Voltage !ithstand tests of arrester insulation2 /o!er freuen#$ s"ar3 over test

- 4undred "er#ent 125++0 mi#rose#ond im"ulse s"ar3 over test

* 6ront%of%!ave im"ulse s"ar3 over test+ esidual voltage test

7 'm"ulse #urrent !ithstand test. "erating dut$ test

8 Tem"erature #$#le test on "or#elain housing

9 /orosit$ test on "or#elain #om"onents10alvani:ing test on metal "arts

11 KV RO*+O$ 2SE C$O$S" (S" 3'5 (part+ to ),)

The distribution fuse #utouts shall be outdoor, o"en, dro"%out e&"ulsion t$"efuse #utouts suitable for installation in +0 4:, 11 KV distribution s$stem

The rated voltage shall be 12 KV

The rated #urrent shall be 100

Rated Li-htin- .p0!se ithstands Vo!ta-e"

To earth and bet!een "oles .+ KV (/ea3)

#ross the isolating distan#e of fuse base 87 KV (/ea3)
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Rated One 6in0te *oer 2re70enc8 9ithstand Vo!ta-e (9et : r8)

To earth and bet!een "oles 28 KV (rms)

#ross the isolating distan#e -2 KV (rms)

$e.perat0re Rise Li.it"

Co""er #onta#ts silver fa#ed 7+0C

Terminals +00C

;etal "arts a#ting as s"ring The tem"erature shall not rea#h su#h a value that

ase To"

Conta#t to the 6use ?in3


3/37

't shall ma3e a firm #onta#t !ith the button head of the fuse lin3 and shall

"rovide a "rote#tive en#losure to the fuse lin3 to #he#3 s"reading of ar#

during fault interru"tions

The fuse #arrier shall be "rovided !ith a #ast bron:e o"ening e$e ("ull ring)

suitable for o"eration !ith a hoo3 sti#3 from the ground level to "ull%out or#lose%in the fuse #arrier b$ manual o"eration

20se Carrier ;otto. &sse.=!8"

The fuse #arrier bottom assembl$ shall be made of bron:e #astings !ith silver

"lating at the #onta#t "oints to effi#ientl$ transfer #urrent to fuse base

't shall ma3e smooth #onta#t !ith the fuse base bottom assembl$ during

#losing o"eration The bottom assembl$ shall have a lifting e$e for the hoo3

sti#3 for removing or re"la#ing the fuse #arrier

20se ;ase (*orce!ain)"

The fuse base shall be a bird%"roof, single unit "or#elain insulator !ith a

#ree"age distan#e (to earth) not less than -20 mm The to" and bottomassemblies as also the middle #lam"ing hard!are shall be either embedded in

the "or#elain insulator !ith sul"hur #ement or suitabl$ #lam"ed in "osition

6or embedded #om"onents, the "ull out strength should be su#h as to result

in brea3ing of the "or#elain before "ull out o##urs in a test 6or "or#elaininsulators, the beam strength shall not be less than 1000 3g

20se $0=e"

The fuse tube shall be made of fiber glass #oated !ith ultraviolet inhibitor on

the outer surfa#e and having ar# uen#hing bone fire liner inside

The tube shall have high bursting strength to sustain high "ressure of the

gases during fault interru"tion The inside diameter of the fuse tube shall be 1.+ mm The solid #a" of the

fuse #arrier shall #lam" the button head of the fuse lin3, #losing the to" endof the fuse and allo!ing onl$ the do!n!ard venting during fault interru"tion

$8pe $ests (S" 3'5 *art : )"

iele#tri# tests

Tem"erature rise test

6o0ntin- &rran-e.ent"

The #utouts shall be "rovided !ith a suitable arrangement for mounting these

on .* @ *0 mm or 100 @ +0 mm #hannel #ross arm in su#h a !a$ that the

#enter line of the base is at an angle of 1+ to 20 deg from the verti#al andshall "rovide the ne#essar$ #learan#es from the su""ort

;ounting arrangement shall be made of high strength galvani:ed steel flat

and shall be robust enough to sustain the various stresses en#ountered duringall o"erating #onditions of the #utout


4/37

11 KV *ORCEL&% %SL&$ORS" (S" '1 and S" '1)"

The "or#elain shall be sound, free form defe#ts, through verified and smoothl$

gla:ed Anless other!ise s"e#ified, the gla:e shall be bro!n #olor

The gla:e shall #over all the "or#elain "arts of insulators ee"t those areas!hi#h serve as su""ort during firing are left ungla:ed for the "ur"ose of

assembl$

The design of insulators shall be su#h that stresses due to e&"ansion and

#ontra#tion in an$ "art of the insulator shall not lead to deterioration

The "or#elain shall not engage dire#tl$ !ith hard metal Cement used in

#onstru#tion of insulators shall not #ause fra#ture b$ e&"ansion or loosening

b$ #ontra#tion and "ro"er #are shall be ta3en to lo#ate the individual "arts#orre#tl$ during #ementing

The #ement shall not give rise to #hemi#al rea#tion !ith metal fittings and its

thi#3ness shall be as uniform as "ossible

The insulators should "referabl$ be manufa#tured in automati# tem"erature

#ontrolled 3ilns to obtain uniform ba3ing for better ele#tri#al and me#hani#al"ro"erties

>oth "in and strain insulators shall #onform to T$"e > of ' .-1 The strain

insulators shall be of Tongue and Clevis t$"e

$est Vo!ta-e"

4ighest $stem Voltage 12 KV (rms)

Visible is#harge Test 9 KV (rms)

Bet /o!er 6reuen#$ Bithstand Test -+ KV (rms)

/o!er 6reuen#$ /un#ture Bithstand Test (/in 'nsulator) 10+ KV (rms)

/o!er 6reuen#$ /un#ture Bithstand Test (train 'nsulator)1- times the

a#tual dr$ flashover voltage of the insulator 'm"ulse Voltage Bithstand Test .+ KV (rms)

2ai!in- Load"

;e#hani#al 6ailing ?oad (6or /in 'nsulators onl$) The insulators shall be

suitable for a minimum failing load of 10 K= a""lied in transverse dire#tor


5/37

- Visible dis#harge test* 'm"ulse Voltage !ithstand Test

+ Bet /o!er 6reuen#$ Voltage !ithstand Test7 Tem"erature C$#le Test

. ;e#hani#al 6ailing ?oad Test8 2* hour ;e#hani#al trength Test for train 'nsulators

9 /un#ture Test10/orosit$ Test11alvani:ing Test

12


6/37

$ests" (S" >4? (*art+))

Che#3ing of threads on heads

alvani:ing test

Visual e&amination test

;e#hani#al test

alvani:ing test

;e#hani#al test

Visual e&amination test

He!ica!!8 2or.ed *in ns0!ator $ies"

4eli#all$ formed ties used for holding the #ondu#tor on the "in insulator shall

be made of aluminum allo$ or alumini:ed steel or aluminum #lad steel !iresand shall #onform to the reuirements of ' 120*8 The ties shall be

suitable for "in insulator dimensions of /t% ' and #ondu#tor si:es s"e#ified

4? (*t, @ ),

luminum allo$ die #ast thimble%#levis for atta#hing to the tongue of strain,

insulator on one end and for a##ommodating the loo" of the heli#all$ formeddead%end fitting at the other end in its smooth internal #ontour

The thimble shall be suitable for all si:es of C #ondu#tors as s"e#ified

The thimble #levis shall be atta#hed to the insulator b$ a steel #utting "in

used !ith a non%ferrous s"lit "in of brass or stainless steel

The thimble shall have #levis dimensions as "er ' 2*87 (/t D '')

4eli#all$ formed dead end gri" having a "refabri#ated loo" to fit into the

grooved #ontour of the thimble on one end and for a""li#ation over the

#ondu#tor at the other end

The formed fitting shall #onform to the reuirement of ' 120*8

2ittin-s for strain ns0!ators of ;a!! : Soc


7/37

The heli#all$ formed fittings for strain insulators shall be sube#ted to tests as

"er ' 120*8

The other hard!are fittings shall be tested as "er ' 2*87 (/art%')

2ittin-s for strain ns0!ators ith He!ica!!8 2or.ed Cond0ctors ead+End

#rips"

2ittin-s for Strain ns0!ators of $on-0e : C!evis $8pe

The fittings shall #onsist of the follo!ing #om"onents

a) Cross arm stra" #onforming to '2*87 (/t'')%1989

b) luminum allo$ die #ast thimble%#levis for atta#hing to the tongue of straininsulator on one end and for a##ommodating the loo" of the heli#all$ formed dead%

end fitting at the other end in its smooth internal #ontour The thimble shall besuitable for all si:es of #ondu#tors ranging from .5211mm to .5--+mm C The

thimble #levis shall be atta#hed tothe insulator b$ a steel #utter "in used !ith a non%

ferrous s"lit "in of brass or stainless steel The thimble shall have #levis dimensionsas "er '2*87 (/t'')%1989

#) 4eli#all$ formed dead%end gri" having a "re%fabri#ated loo" to fit into the

grooved #ontour of the thimble on one end and for a""li#ation over the #ondu#tor atthe other end The formed fitting shall #onform to the reuirement of'120*8%198.

%ote"s the heli#all$ formed fittings are made to suit s"e#ifi# si:es of #ondu#tors,the "ur#hase should #learl$ s"e#if$ the number of fittings reuired for ea#h si:e of

#ondu#tor

2ittin-s for strain ns0!ators ith Conventiona! ead end C!a.ps

&!ternative to 2ittin- Covered"

6ittings for strain insulators !ith #onventional dead%end #lam"s for use !ith

tongue E #levis or ball E so#3et t$"e insulators shall #onsist of the follo!ing#om"onents

a) Cross arms stra" #onforming to '2*87 (/t'')%1989

b) ead%end #lam" made of aluminum allo$ to suit C #ondu#tors from

.5211mm to .5--+mm The ultimate strength of the #lam" shall not be less than-000 Kg The sha"e and maor dimensions of #lam"s suitable for >E and TEC

insulators are sho!n in figures . E 8 res"e#tivel$

#A S$R&% %SL&$ORS" (S" 5')

The "or#elain insulator shall be sound, free from defe#ts, thoroughl$ verified

and smoothl$ gla:ed


8/37

The design of the insulator shall be su#h that the stresses to e&"ansion and

#ontra#tion in an$ "art of the insulator shall not lead to its deterioration

The gla:e, unless other!ise s"e#ified, shall be bro!n in #olor

The gla:e shall #over the entire "or#elain surfa#e "arts ee"t those areas

that serve as su""orts during firing

$8pe of ns0!ators"

The standard gu$ strain insulators shall be designations FG and FCG as "er '

+-00

The re#ommended t$"e of gu$ strain insulators for use on gu$ !ires of

overhead lines of different voltage levels are as follo!s

/o!er ?ine Voltage 11KV

esignation of 'nsulators C

r$ one minute /o!er 6reuen#$ !ithstand Voltage 2. KV (rms)

Bet one minute /o!er 6reuen#$ !ithstand Voltage 1- KV (rms)

;inimum 6ailing ?oad 88(K=)

$ests" (' +-00)

1 Visual e&amination

2 Verifi#ation of dimensions- Tem"erature #$#le test

* r$ one%minute "o!er freuen#$ voltage !ithstand test+ Bet one%minute "o!er freuen#$ voltage !ithstand test

7 ;e#hani#al strength test. /orosit$ test

8 ##e"tan#e Tests (to be #ondu#ted in the follo!ing order)

9 Verifi#ation of dimensions10Tem"erature #$#le test11;e#hani#al strength test

12/orosit$ test

6ar


9/37

*1+52*0Volt T$"e

11KV C T$"e

--KV C T$"e (2 =oGs of trings in

eries)

;asic ns0!ator Leve!"

esignation of 'nsulatorr$ one min "o!er

freuen#$ !ithstand

Bet one min "o!er

freuen#$ !ithstand

T$"e 18 KV (rms) 8 KV (rms)

C T$"e 2. KV (rms) 1- KV (rms)

6echanica! Stren-th"

The insulators shall be suitable for the minimum failing loads s"e#ified as under

esignation of 'nsulator ;inimum 6ailing ?oad

T$"e ** K=

C T$"e 88 K=

$ests" (' +-00)

Ro0tine $est

1 Visual e&amination

2 Verifi#ation of dimensions- Tem"erature #$#le test

* r$ one%minute "o!er%freuen#$ voltage !ithstand test+ Bet one%minute "o!er freuen#$ voltage !ithstand test

7 ;e#hani#al strength test. /orosit$ test

&cceptance $ests (to be #ondu#ted in the follo!ing order)

1 Verifi#ation of dimensions

2 Tem"erature #$#le test- ;e#hani#al strength test

* /orosit$ test

&%#ER %O$CE *L&$ES


10/37

s "er "rovisions of '< ules 19+7, anger =oti#e /lates in 4indi or


11/37

The "late shall be made from mild steel sheet of at least 17mm thi#3 and

vitreous enameled !hite, !ith letters, figures and the #onventional s3ull and

#ross%bones in signal red #olor (refer '+%19.8) on the front side The rearside of the "late shall also be enameled

$ests"

The follo!ing tests shall be #arried out

Visual e&amination as "er '2++1%1982

imensional #he#3 as "er '2++1%1982

Test for !eather "roofness as "er '8.09%19.. (or its latest version)

&CSR and &&C over head cond0ctors"

Conferen#e on tandardi:ation of "e#ifi#ations and Constru#tion /ra#ti#es

in ural esides the ural '), Central Bater E/o!er Commission (Coard of 'rrigation and /o!er and man$

other organi:ations "arti#i"ated in the dis#ussions

>ased on the #onsensus arrived at the Conferen#e,


12/37

i) C .5211 mm (20mm2 aluminum area)

ii) C .52+9 mm (-0mm2 aluminum area)

iii) C .5--+ mm (+0mm2 aluminum area)

L$ Lines

i) C .5211 mm (20mm2 aluminum area)

ii) C .52+9 mm (-0mm2 aluminum area)

iii) C .5--+ mm (+0mm2 aluminum area)

iv) C .5221 mm (2+mm2 aluminum area)

v) C .5-10 mm (+0mm2 aluminums area)

vi)

Standards"

' -98 (/t')%19.7 and ' -98 (/t'')%19.7

Boint in 9ires : Cond0ctors"

ll aluminums #ondu#tors =o oints shall be "ermitted in an$ !ire

luminum Condu#tor teel einfor#ed

&!0.in0. 9ires"

=o t!o oints shall o##ur in the aluminums !ires #loser together than 1+

meters

Stee! 9ires"

=o oints shall be "ermitted in steel !ires used for C of i:es 20mm2

aluminums area (.5211mm), -0mm2 aluminums area (.52+9mm), +0mm2aluminums area (.5--+mm) and 80mm2 aluminums area (.5*09 mm)

'n the #ase of C of 100mm2 aluminums area (75*.2mm .51+. mm)

having seven galvani:ed steel !ires, oints, in individual !ires shall be

"ermitted but no t!o su#h oints shall be less than 1+ meters a"art in the#om"lete steel #ore

$ests"

The sam"les of individual !ires for the tests shall normall$ be ta3en before

stranding The manufa#turer shall #arr$ out test on sam"les ta3en out at leastfrom 10 of aluminums !ire s"ools and 10 of steel !ire #oils 4o!ever,


13/37

!hen desired b$ the "ur#haser, the test sam"le ma$ be ta3en from thestranded !ires

The !ires used for all aluminums #ondu#tors shall #om"l$ !ith the follo!ing

tests as "er '-98(/t')%19.7

i) >rea3ing load test

ii) Bra""ing test

iii) esistan#e test

The !ires used for aluminums #ondu#tors, steel reinfor#ed shall #om"l$ !ith

the follo!ing tests as "er '-98

i) >rea3ing load test

ii) u#tilit$ test

iii) Bra""ing test

iv) esistan#e test

v) alvani:ing test

*ac


14/37

+0mm2 l area (.5-10mm) 10 Km

(>) &CSR

20mm2 l area (.5211 mm) 20 Km

-0mm2 l area (.52+9 mm) 20 Km

+0mm2 l area (.5--+ mm) 20 Km

80mm2 l area (.5*09 mm) 1+ Km

100mm2 l area (75*.2mm .51+.mm) 20 Km

?onger lengths shall be a##e"table

hort lengths, not less than +0 of the standard lengths, shall be a##e"table

to the ma&imum e&tent of 10 of the uantit$ ordered

6ar


15/37

S" 1?+13, "e#ifi#ation for "re stressed #on#rete "oles for overhead

"o!er, tra#tion and tele#ommuni#ation lines

S" >35+13?? ;ethods of test for #on#rete "oles for over%head "o!er and

tele#ommuni#ation lines

S" '>1+134 Code of "ra#ti#e for sele#tion, handling and ere#tion of

#on#rete "oles for over%head "o!er and tele#ommuni#ation lines

&vera-e *er.anent Load

That fra#tion of the !or3ing load !hi#h ma$ be #onsidered of long duration

over a "eriod of one $ear

Load 2actor

The ratio of ultimate transverse load to the transverse load at first #ra#3

$ransverse

The dire#tion of the line bise#ting the angle #ontained b$ the #ondu#tor at the

"ole 'n the #ase of a straight run, this !ill be normal to the run of the line

$ransverse Load at 2irst Crac) &--re-ates

ggregates used for the manufa#ture of "re%stressed #on#rete "oles shall

#onform to S " '' @ 13 ("e#ifi#ation for #oarse and fine aggregatesfrom natural sour#es for #on#rete) The nominal ma&imum si:e of aggregates

shall in no #ase eeed 12mm

(') 9ater

Bater should be free from #hlorides, sul"hates, other salts and organi#

matter /otable !ater !ill be generall$ suitable

(4) &d.iDt0res

dmi&tures should not #ontain Cal#ium Chloride or other #hlorides and salts

!hi#h are li3el$ to "romote #orrosion of "re%stressing steel

(5) *re+stressin- Stee!


17/37

The "re%stressing steel !ires, in#luding those used as un tensioned !ires

should #onform to S " 15 (*art+) @ 13?? ("e#ifi#ation for "lain hard

dra!n steel !ire for "re stressed #on#rete /art%' #old dra!n stress relieved!ire), S" 15 (*art+) @ 13? ("e#ifi#ation for "lain hard%dra!n steel

!ire), or S " ?' @ 13 ("e#ifi#ation for indented !ire for "re%stressed#on#rete)

The t$"e designs given in nne&ure%' are for "lain !ires of * mm diameter!ith a guaranteed ultimate strength of 1.+ Kg5mm2

(?) $he concrete .iD"

'tshall be designed to the reuirements laid do!n for #ontrolled #on#rete

(also #alled design mi& #on#rete) in S " 1'4' @ 13 (Code of "ra#ti#e for"re stressed #on#rete) and S " 45? @ 13 (Code of "ra#ti#e for "lain and

reinfor#ed #on#rete), sube#t to the follo!ing s"e#ial #onditionsL

a) ;inimum !or3s #ube strength at 28 da$s should be at least *20 Kg5#m2

b) The #on#rete strength at transfer should be at least 210Kg5#m2

#) The mi& should #ontain at least -80 Kg of #ement "er #ubi# meter of #on#rete

d) The mi& should #ontain as lo! a !ater #ontent as is #onsistent !ith adeuate!or3abilit$ 'f it be#omes ne#essar$ to add !ater to in#rease the !or3abilit$, the

#ement #ontent also should be raised in su#h a !a$ that the original value of !ater#ement ratio is maintained

esi-n Re70ire.ents"

The "oles shall be "lanted dire#tl$ in the ground !ith a "lanting de"th of 1+

meters The !or3ing load on the "oles should #orres"ond to those that are li3el$ to

#ome on the "ole during their servi#e life esigns given in nne&ure%' are for1*0 Kg and 200 Kg ""lied at 07 ; from to"

The fa#tor of safet$ for all these "oles shall not be less than 2+

The average "ermanent load should be *0 of the !or3ing load

The 6 against first #ra#3 load shall be 10

t average "ermanent load, "ermissible tensile stress in #on#rete shall be -0

Kg5#m2

t the design value of first #ra#3 load, the modulus of ru"ture shall not

eeed ++2 3g5#m2 for ;%*20 #on#rete

The ultimate moment #a"a#it$ in the longitudinal dire#tion should be at least

one fourth of that in the transverse dire#tion The ma&imum #om"ressive stress in #on#rete at the time of transfer of "re

stress should not eeed 08 times the #ube strength

The #on#rete strength at transfer shall not be less than half the 28 da$s

strength ensured in the design, ie *20 & 0+M 210 Kg5#m2

6or model #he#3 #al#ulations on the design of "oles, referred to in nne&ure%

', a referen#e ma$ be made to the


18/37

i.ensions and Reinforce.ents"

The #ross%se#tional dimensions and the details of "re stressing !ire should

#onform to the "arti#ulars given in nne&ure%'

The "rovisions of holes for fi&ing #ross%arms and other fi&tures should

#onform to the


19/37

'tshall be de tensioned onl$ after the #on#rete has attained the s"e#ified

strength at transfer (ie 210 Kg5#m2) The #ubes #ast for the "ur"ose of

determining the strength at transfer should be #ured, as far as "ossible,under #onditions similar to those under !hi#h the "oles are #ured

The transfer stage shall be determined based on the dail$ tests #arried out on

#on#rete #ubes till the s"e#ified strength indi#ated above is rea#hed

Thereafter the test on #on#rete shall be #arried out as detailed in S" 1'4' @13? (Code of "ra#ti#e for "re stressed #on#rete)

The manufa#turer shall su""l$ !hen reuired b$ the "ur#haser or his

re"resentative, result of #om"ressive test #ondu#ted in a##ordan#e !ith S "45? +13?4 (Code of "ra#ti#e for "lain and reinfor#ed #on#rete) on #on#rete

#ubes made from the #on#rete used for the "oles

'f the "ur#haser so desires, the manufa#turer shall su""l$ #ubes for test

"ur"oses and su#h #ubes shall be tested in a##ordan#e !ith S" 45? @ 13?4

(Code of "ra#ti#e for "lain and reinfor#ed #on#rete)

The de tensioning shall be done b$ slo!l$ releasing the !ires, !ithout

im"arting sho#3 or sudden load to the "oles The rate of de tensioning ma$ be#ontrolled b$ an$ suitable means either me#hani#al (s#re! t$"e) or h$drauli#

The "oles shall not be de tensioned or released b$ #utting the "re stressing!ires using flames or bar #ro""ers !hile the !ires are still under tension

Separate e8e+hoo


20/37

overhanging !eight of the "ole, for this "ur"ose the over%hanging "ortion ofthe "ole ma$ be su""orted on a movable trolle$ or similar devi#e

The "ole shall be rigidl$ su""orted at the butt end for a distan#e eual to the

agreed de"th of "lanting ie 1+ ;

?oad shall be a""lied at a "oint 700 mm from the to" of the "ole and shall be

steadil$ and graduall$ in#reased to design value of the transverse load at first

#ra#3 The defle#tion at this load shall be measured "re stressed #on#rete "ole shall be deemed not to have "assed the test if

visible #ra#3s a""ear at a stage "rior to the a""li#ation of the design

transverse load for the first #ra#3

The load shall then be redu#ed to :ero and in#reased graduall$ to a load eual

to the first #ra#3 load "lus 10 of the minimum ultimate transverse load, and

held u" for 2 minutes

This "ro#edure shall be re"eated until the load rea#hes the value of 80 "er

#ent of the minimum ultimate transverse load and thereafter in#reased b$ +"er #ent of the minimum ultimate transverse load until failure o##urs


21/37

Overhead !ines

The general "re#autions during storage and handling of shall be ta3en in

a##ordan#e !ith relevant ' #ode

Bhile la$ing the #ondu#tor shall beta3en from to" of the drum and the

re"eated in the dire#tion of arro! on it Care shall be ta3en to avoid #onta#t

!ith steel !or3s, fen#e, et# b$ giving soft !ood "rote#tion, using !oodenrollers

/ro"er tools shall be used during stringing !or3 uring stringing o"eration

standard sag table or #hart shall be follo!ed and #are shall be ta3en to ensurethat there are no 3in3s in the #ondu#tor Joints in #ondu#tors shall be

staggered ;id s"an oints in #ondu#tors shall be avoided

fter stringing the #ondu#tor, it shall be #lam"ed "ermanentl$ !ith sha#3le or

strain #lam"s n angle or se#tion shall be sele#ted !hile "ulling u"#ondu#tors

B0.pers"

Bhile stringing, suffi#ient length shall of #ondu#tors be 3e"t at sha#3leterminations for ma3ing um"ers Jum"ers shall be neat and as far as "ossible

s$mmetri#al to run of #ondu#tors These shall be made to "revent o##urren#e

of faults due to !ind or birds / #lam"s ma$ be "referred to binding of#ondu#tors at um"er lo#ation or servi#e ta"s

Cross &r.s "

The #ross arms shall be made of ; tru#tural steel The length of #ross arms

shall be suitable for a##ommodating the number of insulators on them !iths"a#ing of #ondu#tor ga" of minimum +0 mm shall be left from the #enter

of "in hole to end of #ross arm on either side The #ross arm shall be

#om"lete !ith "ole #lam" made of ; flat of si:e not less than +0 & 7 mm!ith ne#essar$ nuts, bolts, !ashers, et# The length of #ross arm for #arr$ingguard !ires shall al!a$s run not less than -00 mm be$ond outer most bare

#ondu#tor of #onfiguration

Cross arms shall be "ro"erl$ #lam"ed to the su""ort ta3ing into #onsideration

the orientation of lines

*orce!ain ins0!ators and fittin-s"

The "or#elain insulators shall be #onfirming to ' .-1 D 19.1 for overhead

lines This shall be gla:ed, #ra#3 5 burr free

The insulator shall have adeuate me#hani#al strength, high degree of

resistan#e to ele#tri#al "un#ture and resistan#e to #limati# and atmos"heri#atta#3

ll iron "arts shall be hot di" galvani:ed E all oints shall be airtight /in

insulators 5 sha#3le insulators 5 dis# insulators shall be ere#ted on #ross armsand FG iron #lam" shall be used or as s"e#ified b$


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These shall also be ere#ted on #ross arm at intermediate su""ort in #ase of

long lines, deviation from straight lines Care shall be ta3en that insulators

are not damaged during ere#tion

;indin- .ateria!"

>inding of #ondu#tor !ith the insulator shall be done !ith soft aluminum!ire 5 #ondu#tor The binding of #ondu#tor to insulator shall be suffi#ientl$

firm and tight to ensure that no intermittent #onta#t develo"s The end ofbinding !ire shall be tightl$ t!isted in #lose s"a#ed s"iral around the

#ondu#tor to ensure good ele#tri#al #onta#t and strengthen the #ondu#tor

S0pports and spacin- of po!es"

u""ort of overhead line shall be of adeuate strength #onfirming in all

res"e#ts to rules .7 of 'ndian ele#tri#it$ rules

/ole s"a#ing and #learan#e bet!een lo!est #ondu#tor above the ground level

a#ross 5 along the street shall be in a##ordan#e !ith rule 8+ of 'ndian

ele#tri#it$ rules uitable foundation shall be "rovided for ere#tion of "oles The foundation shall in#lude eavation in all t$"es of soil and ro#3s and ba#3

filling, CC, reinfor#ement, form!or3


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The an#hor "late shall be galvani:ed ; "late The sta$ rod !ith an#hor "late

shall be embedded in #ement #on#rete 1-7 sta$ shall be "rovided at all

angle and terminal "oles ouble sta$ shall be "rovided at all dead ends andin su#h #ase, these shall be as far as "ossible to be set "arallel to ea#h other

Ca-e -0ard"

ll metal su""orts of overhead lines and metalli# fitting atta#hed shall be

"ermanentl$ and effe#tivel$ earthed Cage guard 5 #radle guard shall be madeof 7 B ' !ire #onfirming to ' 27-- in#luding netting, stret#hing and

ointing of #age and la#ing b$ 10512 B ' !ire, binding b$ 1*517 B '!ire

an-er =oards"

ll su""orts #arr$ing 4V lines shall be fitted !ith danger "lates #onfirming to

' 2++1 at height of - ; from ground indi#ating the voltage of line The s#ri"tshall be both in F


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The method shall be ado"ted !here the #able route is through o"en #ountr$,

along road 5 lanes, et# and !here no freuent eavations are en#ounteredand re eavation is "ossible !ithout affe#ting other !or3

9idth of trenches"

The !idth of tren#h for la$ing single #able shall be -+ #m Bhere more than

one #able are to be laid in the same tren#h in hori:ontal formation, !idth oftren#h shall be in#reased su#h that the inter%a&ial s"a#ing bet!een the #ables

for *1+ volts shall be 20 #m and for 11 shall be -+ #m

epth of trenches"

Bhere #ables are laid in single formation, the total de"th of tren#h shall not

be less than .+ #m for #able u" to 11 KV grade and shall not be less than

120 #m for #able above 11 KV grade Bherever more than one tier formation

is unavoidable and verti#al formation is ado"ted, the de"th of tren#h shall bein#reased b$ -0 #m for ea#h additional tier to be formed

*rotective coverin-"

Cable laid in tren#hes shall have #overing of #lean dr$ sand not less than 1.0

mm above the base #ushion of sand before the "rote#tive #over is laid

The #ables shall be "rote#ted b$ > #lass5se#ond #lass bri#3 of not less than 20

#m & 10 #m & 10 #m or "rote#tive #over "la#ed on to" of the sand and both

sides of #able for full length of the #able to the satisfa#tion of


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11KV415V Overhead Line Specification(REC)

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Transcript of 11KV415V Overhead Line Specification(REC)