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MEDPOWER 2014, Athens 2-5.11.2014
The effect of the fuse enclosure temperature rise on
low voltage overhead conductor protection
Constantinos D. Halevidis, Panagiotis . Mo!"a#itis,
Ai#ate$ini D. Pol%#$ati, Pe$i#lis D. &o!$#as
'ational (e)hni)al *nive$sit% o+ Athens
)hool o+ Ele)t$i)al and Co!te$ Enginee$ingHigh /oltages and Ele)t$i)al Meas!$eents ao$ato$%
$oon Pol%te)hnio! t., 153-0 Athens, $ee)e
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Low voltage lines
o6 voltage line $ote)tion in $ee)e % 'H g +!ses in +!seo7es
8o!le losses in a +!se o7 9 sola$ i$$adiation :; n)$eased tee$at!$e
n)$eased tee$at!$e :;
-
tee$at!$e $ise, and )a!ses a shi+t o+ the tie )!$$ent )!$ve to6a$ds
sho$te$ ties, ainl% at the long-tie end
Ove$head a$e )ond!)to$ aa)it% :; f=aient tee$at!$e, 6ind seed and
di$e)tion, sola$ i$$adian)e >
MEDPOWER 2014, Athens 2-5.11.2014
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Aim of this work
-(he $elation et6een )ond!)to$ aa)it% and +!se $ating
- denti+% an% ossile )ases o+ )ond!)to$
o ove$-loading,o !nde$-!tili"ation,o o$ n!isan)e t$iing o+ the +eede$.
MEDPOWER 2014, Athens 2-5.11.2014
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Conductor Ampacity
A))o$ding to EEE 3?-200@
et).
A$o7iation o+ the sola$ heat gain
MEDPOWER 2014, Athens 2-5.11.2014
2 = >c r s con conq q q I R T + = +
0.52
, 1.01 0.0?32 = >f
c l f con amb
f
D vq k T T
= +
4 423? 23?
0.013100 100
con ambr
T Tq D
+ + =
0.532sq D=
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Fuse Enclosure Temperature Rise
Modi+i)ation o+ EC @00 to ta#e into a))o!nt the e7te$nalinstallation o+ the +!se-o7.
0.5 the te. $ise at hal+ the height o+ the en)los!$ed, k, and x +a)to$s and )onstants d!e to the geoet$% and ventilation
oenings
P$oosal
Pin a$e the 8o!le losses in the +!seo7
Psolis the sola$ heat gain =a +!n)tion o+ the sola$ a"i!th and altit!de,
and the a"i!th o+ the +!seo7>
MEDPOWER 2014, Athens 2-5.11.2014
0.5 x
totT d k P =
tot in sol P P P= +
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Fuse De-rating
tee$at!$e $ise, and )a!ses a shi+t o+ the tie )!$$ent )!$ve to6a$ds
sho$te$ ties, ainl% at the long-tie end.
(he shi+t is la$ge$ at the long-tie end 6he$e the heat alan)e andavailale tie dete$ines 6hethe$ the lin# $ea)hes its elting
tee$at!$e, )oa$ed to the sho$t-tie end 6he$e the $o)ess )an e
)onside$ed adiaati).
Mate$ials 6ith high elting oints =s!)h as silve$, )oe$, et).> 6ille7hiit lo6e$ deenden)% on in)$eased ai$ tee$at!$e
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Fuse De-rating
MEDPOWER 2014, Athens 2-5.11.2014
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Case study
1@0, 1@0, 200, 0, 125 A +!ses
(he +i$st, thi$d, and +i+th dea$t!$es a$e
)onside$ed to )a$$%, ea)h, a )!$$ent
eB!al to the $ese)tive +!ses noinal
$ating.
(he +!se-o7 is )onside$ed to e
installed at an a"i!th o+ @0in
Athens.
(he )ond!)to$s !sed a$e al!in!)ond!)to$s o+ 1@, ?5, and 50 2
eB!ivalent )oe$ )$oss se)tion.
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Case study
(otal o6e$ losses o+ 244.5 W in the +!seo7.
(he +!se-o7 sola$ heat gains a$e at thei$ a7i! at 1@00 lo)al tie
=8!l% 21st>
(he tee$at!$e $ise at id-height, and the to o+ the +!se-o7 is
2.2, and 44. , $ese)tivel%, ove$ the aient ai$ tee$at!$e.
n o$de$ to adeB!atel% $ote)t a )ond!)to$
MEDPOWER 2014, Athens 2-5.11.2014
Front ide Top
!eam 44?. ?@.2 10.4
Diffuse 1.5 51.0 @4.1Reflected ?.1 ?2.0 -
Total 325.5 11.2 244.5
1.45 0.F Z N ZI I I I =>
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Case study
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Results and discussion
(he )ond!)to$s e7hiit a g$eate$ sensitivit% to aient tee$at!$e
than +!ses, )onside$ing that the de-$ating o+ the +!ses in)l!des the +!se-o7 tee$at!$e $ise.
e7)et in e7t$ee )onditions o+ $olonged asen)e o+ 6ind.
On the othe$ hand, the +!ses )an )a!se !nde$-!tili"ation, o$ n!isan)e
t$iing o+ the line.
t sho!ld e noted that t$ansient henoena have not een ta#en into
a))o!nt.As an e7ale, in o$de$ +o$ a +!se )a$$%ing its )onventional +!sing
)!$$ent to lo6, it $eB!i$es a tie o+ t6o ho!$s o$ g$eate$ =+o$ +!ses $ated
ove$ @? A>, 6hilst the +!se-o7 tee$at!$e 6ill )onstantl% )hange d!e to
)hanging 6eathe$ )onditions.
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(han# %o! +o$ %o!$ attention
MEDPOWER 2014, Athens 2-5.11.2014
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