BSES_MUMBAI- Underground Cable Management

7/21/2019 BSES_MUMBAI- Underground Cable Management

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UNDERGROUND CABLEMANAGEMENT

(BSES Ltd, Mumbai)


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Underground Cable Netor!

Underground "able netor! i# an im$ortant element in t%e

$oer deli&er' "%ain rom #ubtran#mi##ion to t%e door#te$

o "on#umer*

+m$ortan"e o underground "able netor! and it# ei"ientmanagement in t%e modern da' ele"tri" utilit' i# o $rime

im$ortan"e*

Underground "able netor! %a# #alient beneit# o

reliabilit' and #aet' endoed it% #uitable te"%nologi"alde&elo$ment#*


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Com$an' roile

BSES i# a numerouno "om$an' in t%e bu#ine## o

Generation, Tran#mi##ion and Di#tribution o ele"tri" #u$$l'

%a&ing near -../ underground di#tribution netor! in

#uburb# o Mumbai*

BSES %a# de&elo$ed a #tate o art di#tribution netor! it%

%ig% reliabilit' and 0ualit', %i"% i# a$$arent rom it# #alient

&ital #'#tem $arameter#*


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Su$$l' Area 1 234 S0 5m#No o Con#umer# 1 66*2 La!%#

o$ulation Co&ered 1Abo&e - Crore

Conne"ted Load 1 7728 M9

S'#tem Ma:imum Demand 1 -66; M.*87 M


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DTSGeneration

-;*7= 66. !3 !m#Distribution

kV *+ -LC 64., -6., 8. 6674 !m#

LT Cable#, UG LE 64., -6., 7.

6>66*34 !m#


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T'$i"al #ingle line diagram o a Re"ei&ing Station

Beeder

Ca$a"itorNo*

-

66 = 22 !< +n"omer

rom BSES = Tata

Bu# Cou$ler

-. = 6. M


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Sr*

No

Core Sie T'$e Lengt%

(in !m)

1 3 12 C 300 !L 18"380

6 2 -=6 C 64. AL 826*;7.

3 3 12 C 225 !L 171"750

4 3 12 C 185 !L 55"#30

5 3 12 C 150 !L 11"160

; 2 -=6 C -6. AL -2-7*;..

7 3 12 C #5 !L 32"220

8 3 12 C 70 !L 4"010

> 2 -=6 C 7. AL 2-7*2>.

10 4C 25 !L 32"140

11 3 12 C 0"2 CU 12"870

12 3 12 C 0"15 CU 27"570

13 3 12 C 0"1 CU 5#"#6014 3 12 C 0"075 CU 58"580

15 3 12 C 0"06 CU 3"3#0

16 3 12 C 0"04 CU 88"410

17 4C 0"0225 CU 48"620

18 4C 0"0145 CU 21"3#0

1# 2C 0"0145 CU 2"#10

20 4C 16 !L 3"4#0

TOTAL 2.-;*46.

E:i#ting LT Cable Sie#

LT Cable# o

more t%an 6.

dierent #ie#

are $re#ent in

t%e #'#tem

F$r %is&ribu&i$n

'e&($rk) 312 C$re

300 an* 150 s+

si-e .L/ Cables

ae been

&an*ar*i-e*


9/37February 15

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BSES Ltd* Mumbai Site Condition#1

Te able as a*e+ua&e r$&e&i$n aains& $rr$si$n in ily

$n&aina&e* s$ils like seabe*san* $r aains& ele&r$ly&i

a&i$n near %"C Tra&i$n sys&e" O&er $n*i&i$ns are as

$ll$(s)

i9 %e& $ &ren 1"00 e&ers

ii9 Gr$un* &eera&ure 25 C

:ii9 Teral resis&ii&y $

s$il

150C

;

i9 !bien& &eera&ure 35 C


10/37February 15

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Cro##Se"tion o ?T Cable

CO//< T!/

=:CO'%UCT:'G ;!T< ;LL!>L T!/

OUT< =:CO'

/VC T2 OUT< H!TH

.L/ :'UL!T:O'

G!LV!':% TL

:''< =:CO'

/L


11/37February 15

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->=22!=22!< (E) "able i# u#ed or

"onne"tion beteen bul! #u$$lierF# Re"ei&ing Station and

BSES Re"ei&ing Station and 22!< Sit"%gear to 22 !34

Sie

mm6

Min* Number

o Strand# =9ire#

$er "ondu"tor

Min* Diameter o ea"%

Strand = ire beore"om$a"tion ( mm )

4.. 7> 2*.4

-=-... 3> 2*>2

2.. 2; 2*4

-7. 2; 6*4


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?T Cable#

Condu"tor S"reening1 Eit%er nonmetalli" #emi"ondu"ting ta$e

or a la'er o e:truded #emi"ondu"ting "om$ound or a

"ombination o to*

+n#ulation1 LE e:truded in#ulation

+n#ulation S"reening1 E:truded Semi"ondu"ting #"reening it%

ater #ellable ta$e# and metalli" #"reening*

+nner S%eat%1 re##ure e:truded inner #%eat%ing o Bla"!


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Cro##Se"tion o LT Cable

CTO< H!/%

C


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LT Cable

O$erating Condition#1

T%e -*- !< (E) t'$e "able ma' be u#ed a# -*- !


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-*- !< (UE), - Core 7..mm6LE,

unarmoured "able

O$erating Condition#1

T%e -*- !< (UE) t'$e - "ore 7.. mm6, di#tribution eeder#

emanating rom BSES Di#tribution Tran#ormer# to L*T*

anel#*

Re0uirement1 -*-!


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Com$onent# Condu"tor1 ?4 grade Aluminum "ondu"tor o ele"trol'ti" grade #tranded o

&ariou# "ro## #e"tion i# a# $er olloing table*

LT Cable

Sr Sie

( mm6)

Condu"tor Min* No*

o

Strand#

Min* Diameter o

ea"% ire (mm)

S%a$e o

Condu"tor

1 3DC300 /ase 36 3"40 e&$r

'eu&ral 36 2"40 e&$r

2 3DC240 /ase 36 3"12 e&$r

'eu&ral 36 2"20 e&$r

3 3DC150 /ase 36 2"40 e&$r

'eu&ral 1# 2"30 e&$r

4 3DC120 /ase 36 2"20 e&$r

'eu&ral 1# 2"30 e&$r

5 4C50 /ase 7 3"20 e&$r

'eu&ral 7 3"20 e&$r

6 4C25 /ase 7 2"17 e&$r

'eu&ral 7 2"17 e&$r

7 2C25 /ase 7 2"17 Cir"ular

'eu&ral 7 2"17 Cir"ular

8 1500 /ase 5# 3"5 Cir"ular


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+n#ulation1 LE e:truded in#ulation

+nner S%eat%1 An e:truded inner #%eat%ing o Bla"!


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Cable Sele"tion Criterion

Main Con#ideration#

a) or -- !


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Met%od# o Cable La'ing

a) La'ing dire"t in ground*b) Draing in du"t#*

") ?oriontal Drilling*

T%e "able# are laid dire"tl' in ground or $ulled in du"t#* T%e $ulling

ten#ion i# 0uite im$ortant and de$end# on t%e met%od o $ulling*

re"aution i# u#uall' ta!en not to bend t%e "able to a #%ar$ radiu#* Jer!#and $ull# to t%e "able# are a&oided during in#tallation* Suitable bedding

i# $ro&ided belo t%e "able*

T%e +*S* Standard -677->32 ,Mode o $ra"ti"e or in#tallation and

maintenan"e o $oer "able# u$ to and in"luding 22 !< rating i# a &er'

ell broug%t out do"ument %i"% ma' oer guideline# it% t%i# re#$e"t*

?oriontal drilling i# em$lo'ed %ere e:"a&ation o road# or "able la'ing

i# not $o##ible* +n t%i# met%od t%e road i# drilled %oriontall' and "able#

are laid t%roug% ?ume $i$e# %i"% are in#erted into t%e drilled %ole#*

Beore "able la'ing, e:"a&ation $ermit rom lo"al muni"i$al aut%oritie# i#

ta!en it% $rior intimation and #ub#e0uentl' ne"e##ar' road

rein#tatement "%arge# are $aid on "om$letion o or!*


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On "om$letion o la'ing, termination and Kointing o "able#, a

"om$uteried draing i# $re$ared, %i"% "ontain# t%e

olloing detail# o t%e in#tallation*

a) T'$e o "able#, "ro###e"tion area, rated &oltage, detail# o

"on#tru"tion, "able number and drum numberb) ear and mont% o la'ing

") A"tual lengt% beteen KointtoKoint or end#

d) Lo"ation o "able# and Koint# in relation to "ertain i:ed

reeren"e $oint#, or e*g* Building#, %'drant, boundar'

#tone#, et"

e) Name o t%e Kointer %o "arried t%e Kointing or!) Date o ma!ing Koint and

g) Re#ult o original ele"tri"al mea#urement# and te#ting on

"able in#tallation

All #ub#e0uent "%ange# in t%e "able draing# are entered

ater t%e Kob* All draing# are maintained in digital ormat*

Cable +n#tallation lan


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Monitoring and maintenan"e o Cable#

Alt%oug% t%e #'#tem mig%t %a&e been de#igned "orre"tl' at t%e time o

in#tallation, o&er t%e $eriod o 'ear# #e&eral "%ange# ma' o""ur in t%e

#'#tem #u"% a#, En&ironmental "%ange#, derating o e:i#ting "able#

"au#ed b' in#tallation o ne "able# in t%e &i"init', "%ange# in t%e

t%ermal re#i#ti&it' o #oil,dee"t# in t%e eart%ing and bonding "au#ed

b' brea!# in t%e "ondu"tor and eart%ing material u#ed,in"rea#e o#%eat% $otential be'ond t%e $ermi##ible #ae limit#, e:"a&ation# b'

ot%er utilitie# et"*

Due to an' o t%e abo&e rea#on#, ault# ma' o""ur e&en in a ell

de#igned #'#tem i not $ro$erl' monitored and maintained"

Cable Saeguarding i# done to $re&ent an' damage to t%eunderground "able# during e:"a&ation b' ot%er agen"ie#*

T%e maintenan"e o "able in#tallation in"lude# route in#$e"tion,

$eriodi" "%e"!ing o "urrent loading#, maintenan"e and "are o all

"able# and end termination#*


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Maintenan"e oDi#tribution Netor!

Cable Route +n#$e"tion and Cable Saeguarding

EB' e:$erien"e it i# ob#er&ed t%at about 87/ o t%e "able ault# in t%e

#'#tem o""ur due to damage# to t%e UG "able# b' e:ternal agen"ie#

%o "arr' out e:"a&ation on all road# or t%eir on "on#tru"tiona"ti&itie#* ?en"e to #aeguard "able# olloing $ro"edure# are olloed*

EMont%l' +n#$e"tion o 22=66!< "able route in t%e entire #'#tem

EMont%l' in#$e"tion o -- !< "ro## "ountr' "able route# in #'#tem

EMaKor e:"a&ation# b' e:ternal agen"ie# on all road# are

#u$er&i#ed and "able# (?T=LT) are #aeguarded*

E9%ere&er e:i#ting road# are idened b' t%e Muni"i$al aut%oritie#,

our "able#=#treet lig%t $ole# are #%ited and #aeguarded*


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rote"tion o "able#

a) Normall' t%e %ig% &oltage "able# are $rote"ted again#t o&er"urrent

and eart%ault, %erea# lo &oltage "able#, are $rote"ted b' u#e#*

b) Cable# "onne"ted beteen tran#ormer #e"ondar' terminal# and

"ontrolling #it"%gear i# deemed to be a $art o t%e tran#ormer or

$rote"tion $ur$o#e#* or delta#tar tran#ormer an eart% ault on t%e#e

"able# ill not be #een a# #u"% b' t%e $rimar' $rote"tion, %en"e t%e#e"able# are "o&ered it%in t%e dierential or t%e re#tri"ted eart% ault

one*

") +n "a#e o an u$#tream radial eeder "onne"ted to anot%er eeder

don#tream ,t%e to $rote"tion ill %a&e to be "oordinated #o t%at in

"a#e o a ault in t%e don#tream eeder ,t%e u$#tream $rote"tion

or!# onl' a# a ba"!u$*

d) +n addition to t%e $rote"tion again#t internal ault# or o&er"urrent#,

t%e "able# are al#o to be $rote"ted again#t lig%tning %ere&er t%e#e are

"onne"ted to o&er%ead line#* T%e lig%tning arre#tor# are $ro&ided at

t%e Kun"tion o t%e "able and o&er%ead line*


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Cable Jointing Met%od#

Cable Kointing i# a# im$ortant a# manua"ture=in#tallation* A

&er' %ealt%' "able, $ro$erl' te#ted at t%e manua"turerF# or!

and laid ma' ail due to dee"ti&e and "arele## Kointing*

T'$e# o Jointing "arried out1

a) ol'uret%ane Cable Jointing*

b) ?eat #%rin!able Cable Jointing*

+n "a#e o "able Koint# (Straig%t T%roug% Joint#) and

termination# t%e em$%a#i# i# laid on 0ualit' and #ele"tion o$ro$er "able a""e##orie#, $ro$er Kointing te"%ni0ue# de$ending

on t'$e o "able, #!ill and or!man#%i$ o t%e or!ing

$er#onnel* T%e 0ualit' o t%e Koint i# #u"% t%at it doe# not add

an' re#i#tant to t%e "ir"uit* T%e material# and te"%ni0ue# #o

de#igned to gi&e ade0uate me"%ani"al and ele"tri"al $rote"tion

to t%e Koint# under all #er&i"e "ondition#*


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Cable Te#ting

T%e "able# are te#ted in a""ordan"e it% rele&ant #tandard#

to $ro&e t%e de#ign and general 0ualitie# o t%e "able# a#

belo1

a) Routine te#t# on ea"% drum o "able#*

b) A""e$tan"e te#t# on drum# "%o#en on random or

a""e$tan"e o t%e lot*

") T'$e te#t#*

T%e abo&e te#t# in"lude Condu"tor re#i#tan"e Te#t, artialdi#"%arge Te#t, ?ig%


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E"onomi" Con#ideration#

9%ile te"%ni"al "on#ideration# de"ide t%e minimum "ondu"tor

"ro###e"tion, e"onomi"# go&ern# t%e o$timum #ie, %i"%

ould gi&e t%e minimum running "o#t* or t%i# $ur$o#e, t%eminimum #ie along it% to or t%ree %ig%er #ie# are

"on#idered, and annual running "o#t# or ea"% #ie are or!ed

out b' "al"ulating lo## (in term# o mone') and

intere#t=de$re"iation o t%e "able "o#t* T%e total o t%e#e to

gi&e# running "o#t* T%e #ie t%at gi&e# t%e minimum running

"o#t i# u#uall' "%o#en*


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Con"e$t o Aerial Bun"%ed Cable#

Aerial bun"%ed "able# are LE=?DE in#ulated $oer"ondu"tor# o Aluminum laid toget%er around a %ig% ten#ile#tranded gal&anied #teel in#ulated or bare me##enger ire toorm t%e Aerial bun"%ed Cable* T%i# a##embl' i# dire"tl' #trungon to di#tribution $ole=toer# at an' $oint o di#tribution*

Ad&antage#1

a) Le## ault rate on a""ount o good $rote"tion again#t line andground ault#*

b) ?ig% in#ulation re#i#tan"e to eart% in all #ea#on# and$olluted atmo#$%ere#*

") ?ig% "a$a"itan"e and lo indu"tan"e leading to loim$edan"e o line#*


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T%e mo#t im$ortant rea#on# or "%oo#ing underground "able#

&er#u# o&er%ead line# are a# under1

a) ?ea&il' builtu$ urban or indu#trial region#, lea&ing little orno room or o&er%ead line#*

b) T%e "o#t# o rig%t#oa' or an o&er%ead line e:"eed t%e

e:tra "o#t o under grounding*

") Conge#tion o o&er%ead line# near #ub#tation# or

generating #tation#*

d) Cro##ing o large raila' 'ard# and %ig%a' inter"%ange#*e) Ae#t%eti" "on#ideration#, $ubli" la# and regulation#

) Saet' o a&iation*

erorman"e Anal'#i# o&er o&er%ead line#

General oint# 1


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erorman"e Anal'#i# o&er o&er%ead line#

a) Loading1 T%e $ermi##ible load o an o&er%ead line i# limited b'

t%ermal e:$an#ion (#ag) and t%e annealing tem$erature o t%e

"ondu"tor 9%erea# "able loading i# mainl' limited b' t%e aging o

t%e in#ulating material ( diele"tri" lo##),t%i# lo## i# "on#tant and

inde$endent o t%e load "arried*

b) +ndu"tan"e1Cable# %a&e mu"% loer indu"tan"e t%an o&er%ead

line#*?en"e t%e &oltage dro$ in underground "able# i# le## due to

loer indu"ti&e rea"tan"e*

") Ca$a"itan"e1 Cable# dra mu"% %ig%er "%arging "urrent# t%an

o&er%ead line# on a""ount o t%e "lo#er #$a"ing beteen $%a#e#and t%e $ro:imit' o t%e "ondu"tor and grounded "able in#ulation

#%eat%*

d) Su$$l' +nterru$tion#1 A# t%e "able run# belo t%e ground it i# le##

$rone to natural di#a#ter# and a""ident# %i"% "on#e0uentl'

redu"e# t%e tri$$ing#*

Te"%ni"al Con#ideration# 1


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a) 87/ o t%e interru$tion# are due to damaging o "able#

b' e:ternal agen"ie#* or t%i# it i# re"ommended t%at

Saeguarding o t%e "able netor! be gi&en dueim$ortan"e*

b) 67 / o t%e interru$tion# are "au#ed b' "om$onent

ailure* T%e number o interru$tion# "an be redu"ed b'

#tri"t 0ualit' "ontrol, $ro$er training o $er#onnel to

im$ro&e t%e 0ualit' o or!man#%i$, im$ro&ement# in t%e

$re&enti&e= "ondition ba#ed maintenan"e #trategie#*

ault Anal'#i# o Underground Cable#


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uantiied Beneit#

ailure# o Tran#ormer# %a&e been redu"ed due to a"%ie&ement o

better "able #aeguarding and %en"e redu"tion in number o ault# on

t%e L< netor! t%ereb' redu"ing #urge "urrent due to ault# $a##ing

t%roug% tran#ormer %a&e been a&oided*

Bailure rate o( Di#tribution Tran#(ormer#

0"00

0"50

1"00

1"50

2"00

2"50

3"00

1##4#5 1##5#6 1##6#7 1##7#8 1##8## 1###00 200001 200102 200203

Gear

BailureRate


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uantiied Beneit#

Reliabilit' +nde: Cur&e

98

99

100

an Feb =ar !5r =ay un ul !u6 3e5

Gear 6..2

Reliabilit'+nde:/

T%e Sound Underground Cable Maintenan"e and it# Ee"ti&e

Management %a# made BSES to maintain S'#tem Reliabilit' +nde: to

almo#t -../*


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C%ange# in t%e mar!et# or ele"tri"it' are leading to in"rea#ed utiliation o

tran#mi##ion and di#tribution a##et#* Com$etition it%in t%e "onte:t o t%e

ele"tri"it' o$en mar!et lead# to "on#tant $re##ure on ele"tri"it' tari#,

"om$elling ele"tri" utilitie# to loo! at e&er' o$tion a&ailable to redu"e t%eir

o$erating e:$en#e# and o$timie t%eir "a$ital in&e#tment#*

Underground Di#tribution i# ae#t%eti"all' more a$$ealing, i# not $rone to

eat%er related outage# and %en"e i# e:tremel' reliable, allo# or remo&al

o $ole# and line# rom bu#' #treet# and den#el' $o$ulated area# and

%en"e eliminate# ob#tru"tion# and in"rea#e# #aet' and re#ult# in #im$ler

and a#ter "on#tru"tion be"au#e t%e number o "om$onent# @ au:iliar'

item# or "ommi##ioning t%e line# are redu"ed*

oer deli&er' to "on"entrated mar!et# #u"% a# maKor "itie# and den#e

re#idential area# relie# to a large degree on t%e "ontinued ei"ient

$erorman"e o underground "able#* Ne "able# %a&e to be reliable and

e"onomi"al* Man' e:i#ting underground "able# are aging and load# are

in"rea#ing* T%e#e a"tor# lead to t%e need or e:tra "are in $lanned

maintenan"e and reurbi#%ment or u$grading, in o$timiing "ableo$eration and in de#ign and in#tallation o ne "able#

CONCLUS+ON


37/37

February 15, 2016

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BSES_MUMBAI- Underground Cable Management

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