medpower 2014 fusebox

8/9/2019 Medpower 2014 Fusebox

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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


2/12

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 >



3/12

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$iing o+ the +eede$.



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Conductor Ampacity

A))o$ding to EEE 3?-200@

et).

A$o7iation o+ the sola$ heat gain


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=


5/12

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>


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



8/12

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% $ote)t a )ond!)to$


Front ide Top

!eam 44?. [email protected] 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 =>


10/12

Case study



11/12

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 fusebox

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