8/10/2019 EHV susbattions

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EHV AC Substations : Layout, Equipment, Bus arrangements

1.0 Contents:

a) PURPOSE

b) CLASSIFICATIONS

c) VOLTAGE CLASS & RATINGS

d) Bus switching schemes

e) SLD & La !uts

f) SUBSTATION E"UIP#ENTS .

g) GIS

2.0Purpose:

1.1 The su$stati!ns a%e e% much essentia' t!

a) Eacuate (!we% )%!m gene%ating stati!ns*

b) T%ansmit t! the '!a+ cente%s*

c) Dist%i$ute t! the uti'ities & u'timate c!nsume%s*

,*-* The E'ect%ica' (!we% gene%ati!n )%!m .+e'/ The%ma'/ Nuc'ea% an+ !the%

gene%ating stati!ns has t! $e eacuate+ t! '!a+ cente%s* The gene%ati!n

!'tage is 'imite+ t! ,01,2 3V +ue t! the 'imitati!n !) the %!tatingmachine%* This $u'4 (!we% has t! $e ste((e+ u( t! highe% !'tages

+e(en+ing !n 5uantum !) (!we% gene%ate+ an+ +istance t! the '!a+

cente%s* Again the (!we% has t! $e ste((e+ +!wn t! +i6e%ent '!we%

!'tages )!% t%ansmissi!n an+ +ist%i$uti!n*

,*7 In $etween the (!we% h!uses an+ u'timate c!nsume%s a num$e% !)

T%ans)!%mati!n an+ switching stati!ns hae t! $e c%eate+* These a%e

gene%a'' 4n!wn as su$8stati!ns

3.0 CLASSIFICATIONS

3.1.Acc!%+ing' the su$stati!ns a%e c'assi9e+ as

a: Gene%ating su$stati!ns ca''e+ as ste( u( su$stati!ns

$: G%i+ su$stati!ns

8/10/2019 EHV susbattions

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c: Switching stati!ns

+: Sec!n+a% su$stati!ns

7*,* The gene%ating su$stati!ns a%e ste( u( stati!ns as the gene%ati!n !'tage

nee+s t! $e ste((e+ u( t! the (%ima% t%ansmissi!n !'tage s! that huge

$'!c4s !) (!we% can $e t%ansmitte+ !e% '!ng +istances t! '!a+ cente%s*

7*- The g%i+ su$stati!ns a%e c%eate+ at suita$'e '!a+ cente%s a'!ng the (%ima%

t%ansmissi!n 'ines*

7*7 Switching stati!ns a%e (%!i+e+ in $etween 'ength (%ima% t%ansmissi!n 'ines;

a) T! a!i+ switching su%ges*

b) F!% eas seg%egati!n !) )au't

c) F!% (%!i+ing e6ectie (%!tecti!n t! the sstem in the A*C* netw!%4*

d) The switching stati!ns a's! %e5ui%e+ whe%ee% the E.T 'ine a%e t! $e ta((e+

an+ 'ine t! $e e=ten+e+ t! +i6e%ent '!a+ cente%s with!ut an ste( +!wn

)aci'it at the switching stati!ns*

e) The num$e% !) !utg!ing 'ines wi'' $e m!%e than the inc!ming 'ines/ +e(en+ing

!n the '!a+ (!ints*

3.4.Sec!n+a% su$stati!ns a%e '!cate+ at actua' '!a+ (!ints a'!ng the sec!n+a%

t%ansmissi!n 'ines whe%e the !'tage is )u%the% ste((e+ +!wn t!;

a) Su$ t%ansmissi!n !'tages

b) P%ima% +ist%i$uti!n !'tage*

c) Dist%i$uti!n su$stati!ns a%e c%eate+ whe%e the su$8t%ansmissi!n

!'tage an+ (%ima% +ist%i$uti!n !'tage a%e ste((e+ +!wn t! su(('

!'tage an+ )ee+ the actua' c!nsume%s th%!ugh a netw!%4 !)

+ist%i$uti!n an+ se%ice 'ine

This sstem has g!t >e=i$i'it !) t%ans)e%%ing an Ci%cuit t! an !) the Bus*F!%

#aintenance !% !n )au't !ccu%%ence !n !ne Bus/ then !n' that Bus $ec!mes

+ea+/ whi'e the !the% Bus %emains in se%ice* F!% #aintenance !) a Ci%cuit

B%ea4e%/ that (a%ticu'a% Ci%cuit has t! $e ta4en !ut !) se%ice* T! !e%c!me this/

an a++iti!na' $(ass is!'at!% is (%!i+e+ as in+icate+ in 9gu%e a$!e