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Sutjeska Hydroelectric Power Plant (S-3) - Report

1. Background and Objectives

On the 11th of March 2004 and the 3rd of April 2004, the Contract for Consultancy Service between International Management Group (IMG) andHidrowatt .!. was sined to carry out the pro!ect, ”Analysis of the possibility

to use sall (ini) hydro ener!y for electricity production in "osnia and Her#e!o$ina” , financed by the "Spanish Aency for #nternational Cooperation$A%C#&', a section of the Minister of (orein Affairs of the Spanish )overn*ent+

ithin the fra*ewor- of this contract, the co**it*ent is established, on thepart of .idrowatt, S+A+ to carry out ten feasibility studies, developed at the pre/pro!ect stae, for the hydroelectric plants in the epublic of Srps-a+

he choice of the ten sites was carried out usin the study "%ale hidroelektraneu Republici Srpskoj ', written by the %lectric Co*pany of the epublic of Srps-a+#n this docu*ent, the infor*ation about 130 possible sites distributed

throuhout the epublic is co*piled+ Of these sites a first selection of 20 wascarried out, and after visits to the sites 10 sites were chosen that, at firstevaluation, present a reater hydroelectric potential+

he present pre/pro!ect for*s a part of the roup of 10 feasibility studies thathave been written within the li*its of the previously *entioned contract+

he ob!ective of this ro!ect is to analye the technical/econo*ic feasibility of the Sut!es-a .ydroelectric ower lant $S/3& in the Sut!es-a iver+ (or this, wewill ta-e into account the physical fra*ewor- in which it will be i*ple*ented$hydroloy and eoloy&+ he distinct possible alternatives for the desin of thesite will be analyed and the scope of the production will be esti*ated+ hisinfor*ation with the analysis of the necessary invest*ent will provide precisepara*eters with which we can establish its econo*ic feasibility+

1

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". #$%sical &ramework

2+1 ocation and description of section of river to be used+

he Sut!es-a is one of the tributaries of the upper course of the 5rina iver+ he

head of the basin is on the border with the epublic of Montenero, placin thestudy area at appro6i*ately 11 -*, in a straiht line, to the 7ortheast of )ac-o+he Sut!es-a iver circulates in a S/7% direction and is a tributary to the leftof the 5rina+

he Sut!es-a .ydroelectric ower lant $S/3&, has various secondarycollections, as well as a principal one in the river itself, which re8uires theanalysis of the different sub/basin slopes+ he principal basin for the site has anarea of 1'." -*9+ he principal course descends fro* a heiht of 1:;0 to aheiht of 10i Stit Mountain at 1?;2 *+ he *ost i*portant tributaries of theSut!es-a are located on the riht ban-+

As previously *entioned, durin the course of the hydraulic circuit, differentcontributions will be utilied for different tributaries of the Sut!es-a+ hesecourses are@ as oto-, with a basin area of 1.1' -*2, and is a tributary to theleft of the Sut!es-a at its head+ he ars-a voda, a s*all tributary on the riht,with a basin area of ".* -*9+ A series of s*all torrents that are located on theriht ban- of the future channel and are susceptible for collection, they add to abasin area of +."+ -*9+ (inally, Crni oto-, is an i*portant torrent locateddownstrea* fro* the future forebay, with a basin area of ".,- -*9 and for whichits utiliation is planned with an inta-e and specific conductions+

#n the followin raph, we include a sche*e of the different basins+

2

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Figure 1

he . is located between heihts of 10

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located in different torrents that flow to the principal course downstrea* fro*the inta-e, an open nappe channel that initially follows a tunnel throuh a s*allelevation, a forebay, a penstoc-, a dischare channel and finally a power house+

he Sut!es-a =alley was for*ed by the action of the river durin the upper cretaceous period, which enerated e6tensive layers of sedi*entary *aterial$flysch& and for*ed an asy**etric valley in ter*s of eoloical structure+

On the riht ban- of the valley the solid li*estone substrate is covered withloose alluvial *aterial with different partially active landslides+ #n the *ostelevated parts, s*all accu*ulations of *oraine *aterial are found that,upstrea* fro* the inta-e area, create a layer of appro6i*ately 20 * of potentialcoverin a lare part of the valley+

#n the intake area the Sut!es-a iver the profile is sy**etric with a narrow area

and elevated lateral slope s which hihliht the presence of lare li*estonebloc-s in the course of the river+ he foundations of the wor-s will be carried outon roc- with hih resistance, however downstrea* fro* this point a process of lateral and botto* erosion is observed+

he inta-e of the course of the as poto- is carried out in the co*pact clay areawith a lare erosion process and with accu*ulated *aterial fro* landslides+

he route of the derivation channel to the Sut!es-a course follows a *orpholoyand si*ple structure of *arls in a lihtly sloped terrain+ he area with looseli*estone should be avoided and support for the wor-s in the *arls should besouht+

he principal derivation c$annel is planned usin a tunnel that runs parallel tothe stratified upper cretaceous period *aterial for its entire lenth+ .ere lareclastic roc-s are found with ood physical/*echanical conditions+ his way,necessary underpinnin wor- is esti*ated only in the entrances, however further *ore detailed studies should define this wor-+ he e6terior route of thischannel is in a co*ple6 active landslide area which will be considered durinthe construction of the channel+

#

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Figure 2

he final part of the . will include a oreba%, a penstock and a power $ouse+ hese will be located in ho*oeneous *arl terrain with a hihresistance+

#n conclusion, no proble*atic connections to the eo*orpholoy of the locationhave been detected+ #n any case, an in depth eoloical/eotechnicale6ploration should be done durin the realiation phase of the pro!ect anddurin construction wor-+

2+3 .ydroloy

he base infor*ation for the hydroloical study was ta-en fro* the Ce*ernoand )ac-o stations, for which *onthly precipitation infor*ation was availablebetween the years 1B

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and 1B?B, but *issin infor*ation for 1B::, 1B?: and 1B??+ (inally, dailyaverae flow data for the series between Eanuary 1B:? and 5ece*ber 1B?Bwas available, but *issin the series of data between Eanuary 1B?: and5ece*ber 1B??+

Table 2. Flow Station dataStation Igo0e

iver Sut!es-a

%levation 4

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Table $. Basin data for Sutjeska H !S"3#

Area $e8uivalent& 2

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Figure 3

2+4 %nviron*ent

ith the ob!ective of deter*inin the ecoloical flows that can be left to circulate

in the inta-e, a preli*inary study was carried out by the co*pany 5CO7d+o+o+, in which these flows should be detected and, the e6istence of, if any,possible environ*ental proble*s that would *a-e the site inappropriate+

his infor*ation is attached as Anne6 3 to this report+ his study deduces theenviron*ental co*patibility of the ob!ective site of this study+

he report deduces that the ecoloical flow or reserve that can be uaranteedby the inta-e is@

5 6 ++ l2s

#t is e6plained in the anne6 that the criteria used for the deter*ination of thisfiure does not correspond to any specific nor* of the epubli-a Srps-a, but touidelines that could be applied in to a future reulation+

e consider it appropriate, while no specific use orders e6ist, to adopt as theecoloical flow that correspondin to 10K of the averae flow at the inta-epoint, a percentae widely accepted in different reions in %urope+

)iven that the averae flow at the inta-e point is 11?0 lHs, it is intended, assuch, to uarantee the ecoloical flow at the inta-e point of@

5 6 11' l2s

&

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4. !lternatives tud%

3+1+ rior Study

#n studies previously carried out by &lektropri$reda Republike Srpske, the inta-eis in the Sut!es-a iver, usin a yrolese inta-e at a heiht of 10;;+ he tunnelbeins downstrea* fro* the inta-e, with a lenth of appro6i*ately

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Figure 3

5ownstrea* fro* the inta-e, appro6i*ately 3;0 *, a torrent beins with ani*portant flow $see anne6 1&+ he collection of flows fro* this course,deno*inated by as poto-, is considered interestin for which the constructionof a s*all inta-e is planned, fro* which a pipe with a s*all dia*eter will beinuntil it reaches the Sut!es-a weir upstrea*, with which the contributionturbinable will increase by 4K+

Figure $

eturnin aain to the principal channel, the construction of a tNnel that runsthrouh the Ol!i t hill, which separates the Sut!es-a fro* the ars-a voda is

planned+ he lenth fo this e6cavation is

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reinforced concrete pipin+ ith this wor-s, the collected flows in the Sut!es-aare united with the natural course of the ars-a voda+ he construction of asecond inta-e in this river will channel the su* of these flows+ he followinphotoraph shows the sche*e that is plannedJ the as poto-, the Sut!es-a andthe ars-a voda can be seen+

Figure %

#rincipal $%draulic circuit.

Once the second inta-e is built, in the ans-a voda, downstrea* fro* thetunnel e6it that would transport the water fro* the Sut!es-a, the construction of a channel at hillside halfway that will run to the forebay is planned+ he choiceof an open channel as the transport syste* responds to two reasons@ openchannels are the *ost econo*ic syste*s for water transport, and they per*itthe incorporation of stor* water that runs down the hillside+

#n accordance with Anne6 1, it is esti*ated that this contribution can beassu*ed to be

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incorporate the flows of the other torrent in its path+ #n the other hand thelenthenin of the channel, the larer di*ensions, to these two torrents, whichwould i*ply i*portant construction difficulties and therefore, hiher costs+

Figure &

Figure '

12

+nta)e at ars)a voda and

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Figure (

he sche*e in which the principal hydraulic circuit is found is shown in thefollowin photoraph, parallel to the river on the riht ban-+ he forebay whichleads fro* the penstoc- and the secondary hydraulic circuit which co*es fro*the Crni poto- which incorporates water fro* the other torrent alon the wayand concludes in the forebay+

Figure )

he incorporation of the flows fro* these two torrents will assu*eappro6i*ately 10K of the total contribution of the syste*+

1"

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#ower $ouse

he power house will be located upstrea* fro* the proposed point in theprevious study, coherently with the previously e6posed plan, in which the

situation of the forebay before the cross of the two torrents was opted for+ hissituated it at appro6i*ately ?;0+ he power house will be e8uipped with a sinleelton turbine with four in!ectors and a vertical a6is+

1#

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*. 7imensioning o $ead

#n accordance with the classified flow curves obtained in the hydroloical study,we adopt as desin flow@

5design 6 4. m2s

A value which is appro6i*ate to L

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Figure 1*

10;?,?3

10

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+. General description o t$e adopted solution

#n -eepin with the previous sche*e, the power plant will contain three principalinta-es and various secondary inta-es that will incorporate s*all flows fro*

various torrents to the channel+ he first section of the principal channel willcontain a !ac-in pipe with a lenth of

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. 7escription o /ivil 8orks.

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he tunnel behind the Ol!i t hill is constructed usin a reinforced concrete !ac-in pipe with an interior dia*eter of 1

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hrouhout the route of this channel, contributions will be received fro* thetorrents that cross usin the planned secondary inta-e wor-s+

At 2200 * fro* the beinnin, a forebay is found with a lenth of appro6i*ately30 *, which receives water fro* this channel+ his wor-s includes a 20 *

spillway+ he surplus flow that passes over the wor-s will be returned to theriver course usin a dischare channel, which will end in a stillin pool+

he connection to the penstoc- will be carried out usin a thrashrac- with anauto*atic cleanin syste*+

he flows fro* Crni poto- will also be incorporated into the forebay, and thoseof the closest second torrent, in the inta-e, which will de*ar- the waters to theforebay usin .5% pipes+

he evacuation channel for the forebay will connect to the e6istin torrent+

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he eneration e8uip*ent is stored on the lower level of the buildin, which isaccessed by stairs+ #n this buildin the au6iliary e8uip*ent and devices thatinterate the electrical installation are also found+

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,. 7escription o =>uipment and &acilities

:+1 %lectro*echanical e8uip*ent and enerator roups

./0/0/ 1eneral

#n relation to the head and flow that is available in the studied ., the *ostappropriate turbine type is a elton with 8uadruple in!ection+

his is !ustified in Anne6 < with the specific velocity calculation for the turbine+

hese turbines have very ood efficiency with reduced flows and for thatreason, uarantee the plant a lare rane of flows, with the disposition of onlyone roup, which is the final adopted solution+

./0/2/ urbine

elton turbine with the followin characteristics will be installed@

ype@ elton with 4 in!ectors, vertical a6is7et head@ 204+20 *5esin flow@ 3+0 *GHsSpeed@

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./0/3/ Safety $al$es

he safety valves will be the butterfly type, driven by a servo*otor with an oilopenin and closure by counterweihts, di*ensioned to close in the worstpossible conditions+

he butterfly valve will have a dia*eter of B00 ** and will be desined tosupport a pressure of 30 bars+

#t will be *ade up of the followin ele*ents@

=alve carcass, with *echanowelded e6ecution with screwed flanes inunion with the spiral cha*ber and the penstoc-+

Obturador disc with e6centric a6is with a continuous !oint and a tendencyto close

Seal Seat in the welded and rectified stainless steel !oint+ Autolubricated a6is bearins without *aintenance+ 5is*antlin spool or flane syste* for the union between the butterfly

valve and the penstoc- with all accessories+ Operatin lever with counterweiht fro* *echanoweldin construction .ydraulic servo*otor with si*ple effect for the operatin procedure valve y/pass valve with *anual ate valve upstrea* and with another oil

servo*otor upstrea* to e8ualie the pressure on both sides of the valve+ Set of co**and and control ele*ents for the end of path valve and by

pass $57?0, 7 30&, *ano*eters with contacts for pressure indicationand detection, differential presso*eter, etc+

5is*antlin spool 57B00 7 30 (i6ed spool 57B00 7 30

./0// +leohydraulic !roups

he oleohydraulic roup will serve for the operation, control and reulation of the in!ectors, actin on the servo*otors of its needles and deflectors+ As well, itwill operator the servo*otors of the butterfly valve, the by/pass valve andeventually, the servo*otor of the refrieration valve, if necessary+

he roup will basically be for*ed by the followin ele*ents@ Oil tan- with optical and electrical levels, ther*ostats, e*ptyin tap and

filter cover+ Motorpu*p tea*s, principal and reserve+ 5ouble filter in the i*pulsion with electrical and visual indication of poor

functionin+ ladder pressure accu*ulators Operation electrovalves with different servo*otors+ Antireturn valves, incidental, distributive, flow reulators, presso*eter,

ther*o*eters,connection, pipin, etc+ for*in the hydraulic circuit

between the hydraulic roup and other overned roups+ Speed sensors

2"

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./0/4/ 1enerator

his is *ade up of a synchronous triphasic alternator, with vertical a6is, air ventilated in open circuit, prepared for its attach*ent to the hydraulic elton

turbine, whose rotor will overhan the a6is of the alternator+

he eneration will be

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:+2 %lectrical facility

./2/0 1eneral

his feasibility study proposes a concrete type of facility, with reference to itsconception, structure, electrical sche*e, functionin and operation *odes,connection to the electrical networ- and operation *odel+ he type proposedhas been co**ented and shown in various *eetins *aintained with directorsand technical personnel at &lektropri$reda Repblike Srpske5 therefore bein inaccordance with the conditions and nor*s of the co*pany+

#t should be born in *ind that the *odel proposed is the *ost appropriate fro*our understandinJ however it could be totally or partially chaned durin thepreparation phase of the construction pro!ect, in function to the criteria or needs

of the final developer, the Co*petent Ad*inistration or the Owner+

he basic ob!ective on which this study has been developed is to provide afacility that functions alone, without continuous presence of operative personnel+his personnel will be capable of respondin and actin in an auto*atic waybefore any proble* that could arise whether foreseen or not, and will *anaethe available resources in an opti*al way and will uard, a preferential way,their personal security and interity+

herefore, an auto*ated power plant for stop and start is proposed, anticipatinoperation in a se*i/abandoned state+ he operation personnel should onlycarry out viilance wor- and routine inspections+ Only in the event of brea-downor preventative or corrective *aintenance will *ore dedicated intervention beneeded+

)iven appropriate operatin conditions the power plant will functionauto*atically, the synchronis* and connection to the red will be carried out andwill be placed in the predeter*ined reulation *ode+ hen any type of incidentarises that would oblie stoppin, it will be carried out auto*atically and thefacilities will wait until service conditions have been re/established+

#n the case of brea-down or continuous defect the plant will enter into the stopphase with bloc-in, and will enerate the alar* se8uences necessary so thatthe operation personnel will o to the facility+ (or this reason, it is planned thatthe power plant will have the capacity to auto*atically contact the operationpersonnel+

he operation of the power plant in an isolated networ- rei*en is not planned+

he electrical facility will be co*posed of@

)eneration at

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Co**and and control+ Auto*atic functionin usin an industrialauto*aton

atteries with direct current+ ower lines and sinal to the da* Aerial line for connection with closest substation+

./2/2/ Hi!h tension facility

he plant will consist of a enerator with a power of

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/ell or t$e au@iliar% service transormer. #n this set of cells the entrance and e6it will be with 1?H30 -= cable+

he connections between the enerator and its transfor*er will becarried out usin subterranean cable with dry insulation $

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!u@iliar% ervices ransormer + k9!C

o supply the alternate current circuits to the au6iliary services of thepower plant, a ;0 -=A transfor*er will be installed, interior installation,relation to the transfor*ation 20,000H3?0/220 =, connection roup 5yn11,

in silicon or oil bath+

#t will be placed in the interior of a *etal protection cell and its locationwill be continuous to the M++ transfor*er protection cell situated in the20 -= precinct+

/ells k9

he enerator will be three/phase and will re8uire a neutral phase for *easure*ent and protection+ hat the enerator has an accessible

neutral phase is not planned+

(or this, the for*ation set for the neutral $three transfor*ers of intensity&should be installed in *etal cell $:+2 -=&+

Other < -= cells available will those for control of enerated tension$three tension transfor*ers& and the roundin of the neutral cell $anintensity transfor*er and a resistance&+

./2/3/ 6ow tension facility

General

#n the interior of the power house, the followin will be installed@ co**and,protection and alternator and turbine control panels, the protection panel for thenetwor- connection, the panel for au6iliary services, the auto*aton panel, andthe panels for the direct current batteries+

#anels

he ele*ents for the co**and, control and protection of the power plant will belocated in *etal electrical panels containin, basically the followin ele*ents@

General panel o au@ilar% services 7/ and !/ will contain theauto*atic switchs for all of the operatin procedure circuits for the power plant, as well as their protections+

!utomation panel and C with the correspondin power plantsupervision and control software+ (or the operation process in auto*atic*ode for the plant, a prora**able auto*aton will be installed that willcontain its own panel, and a des-top C connected with correspondin

software for supervision and control+ #t will control the *anae*ent,operatin procedure and control of the plant in a state of abandon*ent

2&

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and the telesupervision fro* a re*ote plant, fro* which the sa*einfor*ation can be accessed usin another C connected to the power plant via telephone+

Additionally, in this panel co**unication ele*ents with the water inta-e

panel and those for sinallin and control of the ele*ents of theoperatin procedure and control of para*eters in the da*+

D.. panel or turbine. ill contain the protections, state indicators, controls for operatinprocedure, turbine controls and au6iliary e8uip*ent and flow indicator+

/ommand and s%nc$ronicit%+ #n this panel the synchronis* e8uip*entwill be installed, with an auto*atic synchro/connector and co**andsand indicators for the position of the 20 -= apparel and the electricalpara*eters of the networ- and eneration+

Generator panel+ ill contain the relays for the electrical protection of the roup, includin those for the correspondin transfor*er and theele*ents and indicators of the electrical para*eters for functionin+

Battery panel 7/+ his is *ade up of two identical units that willsupply different circuits+ One will provide direct current for the supply of the relays and the control panels in all of the power plant apparel up tothe 20 -= transfor*er ter*inals+ he second battery is destined,e6clusively for the supply of the protection relays for the connection andoperation *otors for the auto*atic connection switches, synchronis*and au6iliary circuits+

/ounting panel+ (or the *easure*ent of enery enerated andconsu*ed, both active and reactive+

#anel or protections or t$e network connection+ #n this panel all of the protection relays and au6iliary relays for the operatin procedure willbe found+

&oreba% panel+/ #nside the forebay facilities a *etallic panel will be

installed that will contain the e8uip*ent for sinal and data trans*issionto the plant, the co**and and protection of the oleohydraulic roups andthe operation *otors for the correspondin hydro*echanical roups andthe lihtin circuit and soc-et+

=lectrical #rotection

#rotections and transormers rom neutral to k9Cher*o*eter $alar* and shutdown&uchhol $alar* and shutdown&arrel protection $

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?:, loc- differential $enerator F transfor*er&+

Generator #rotectionC362: @ *ini*u* tension

36;B @ *a6i*u* tension?1* @ *ini*u* fre8uency?1M @ *a6i*u* fre8uency32 @ inverse power ;0F;1F;07F;17@ overintensity and phase shortcurcuits and ho*opolar 40 @ %6citation error 4< @ #ntensity of neative se8uence?: @ loc- differential $enerator F transfor*er&

/onnection protectionsContra overintensities $;0F;1F;07F;17&

Contra poly/phase defects to the networ- $*ini*u* networ- tension&$362:&Contra defects fro* round to networ- $;B)&Of *a6i*u* and *ini*u* fre8uency $?1M F ?1*&Of *a6i*u* tension $;B& $between phases&loc- of connection fro* the power plant for lac- of tension in thenetwor-

!utomation

he power plant will function autono*ously in accordance with the installedprora* in the prora**able controller $C& and in function to the availabilityof flow and the e6ploitation rei*en that will be fi6ed in each *o*ent+

he installation will be *ade up of a C with lare features which the recordsand other wor- values will be introduced voluntarily usin a C containin thesupervision and control prora*+

he para*eters and wor- records can be easily chaned followin the specificnecessities of each instant+

elesupervision All of the data received and stored in the plant C will bevisualied and treated fro* re*ote centre, usin another C andco**unication via telephone $7 or )SM&+

he telesupervision will be co*pli*ented by an auto*atic alar* *anae*entsyste* and advisories to the heads of wor-in for any brea-down+

Operation manners and instructions

he operation and trac-in of the functionin of the power plant should be ableto be carried out usin the followin *ethods@

"0

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!utomaticall% wit$out t$e intervention o an operator + All of thecontrol of the facility will be e6ecuted and supervised for the auto*aton+his will carry out the operatin procedures for start/up, synchronis*,

connection, reulation, state and alar* viilance, nor*al stop ande*erency stop, and teleco**unication+

he auto*aton will reulate the openin of the turbine, and the flow to beturbined, in function to the infor*ation that is provided by the level probein the forebay+

emiautomatic+ he auto*aton will stay in viilance or uardin state*a-in sure that no prohibited actions are produced and e6ecutin thestop process before the appearance of any ano*aly caused by i*proper operation or for activation of any electrical or *echanical protection+ he

operator will be able to *anoeuvre the power plant fro* the ++ panelthat will include a chart with all of the indications or as well fro* thecontrol station in the power plant $ter*inal with co*puter&+

Manual or tests. #n this operation *ode, tas-s can be carried out fro*the C and fro* the buttons and touch screen, located on the front sideof the panel, allowin *anual operations to be carried out for differentele*ents, *aintainin the auto*aton as viilante for the differentsecurities and for indicatin the possible alar*s that are producedhowever, to avoid incorrect *anoeuvres the necessary loc-s will beintroduced based on the loic of the cabled relays for those criticaloperatin procedures+ All of the electrical and *echanical protections willbe active and will act independently of the functionin *ode+

ith reard to records the followin possibilities for functionin and reulationwill be described@

SpeedHfre8uency control+ (or connection *anoeuvres to the networ-e6clusively+

ension control+ o ad!ust the synchronis* with the networ- prior to the

connection+ #n functionin, stable will re*ain deactivated+ ower factor control+ #n stable wor-in, followin a fi6ed record+ Control in stable wor-in in function to the level of water in the

forebayHda*+ Operation in function to the available flow+ Control in stable wor-in in function to the prefi6ed flow+ Control in stable wor-in in function to the desired power+ Control in stable wor-in in function to the hourly period and the flow

availability

"1

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#ower lines and signal to t$e intake.

#n the forebay electrical power needs will e6ist for the supply to the differentinstalled e8uip*ent+ )ates, auto*atic cleanin thrashrac-s, flow*eters, levelprobes, lihtin and power soc-ets+

heir supply fro* the power plant will be carried out usin a low tension power cell $uipment or command and control.

he auto*atic functionin of the facilities re8uires that all possible infor*ationbe provided to the prora**able auto*aton so that it can analye and order loical functionin se8uences+

his infor*ation should be iven to all of the installed e8uip*ent that *a-es upthe correspondin sinal e*ission ele*ents that are already diital $open Iclosed, up I down, position, status of an ele*ent, active no active, advisory or alar* contacts& or analoue $in!ectors positions, ecoloical flow valve,para*eter values such as flows, water level in the inta-e, oil level in e8uip*ent,functionin te*perature of e8uip*ent, power, tension, etc+&+

%ach set of e8uip*ent, as well as its au6iliary e8uip*ent $oleohydraulic roup,lubrication roup, etc+& will have associated control ele*ents+ Other should bee6pressly installed+ More concretely, da* level probe, inta-e security buoys,inta-e flow *eter, level probe in e6it channel, fire detectors, flood detectors and

personnel presence detectors+#t will be necessary to install a couple of telephone lines, )SM type or usinconventional cable+ hese will be used for the re*ote control of the facility for readin of *eters and for *anae*ent of alar*s for wor-in personal and to5ispatchin or the *ain plant control+

Ot$er &acilities

A rounded networ- will be installed in the power plant, inta-e and in eneral, in

all areas that contain electrical e8uip*ent+

"2

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At the sa*e ti*e, where buildins, houses and areas where e8uip*ent ispresent, either te*porarily or for wor- e6ist, lihtin networ-s and soc-ets willbe installed+

:+3 ine

An underround line will co*e out of the 20 -= cells reachin the first supportfor the aerial evacuation line of the enerated enery+ #n this first support, theconversion aerial/subterranean will be carried out and will consist of a brea-er for the end of the line+

he aerial line will lin- the power plant with S of Suha $110 H 20 -=& where aposition of 20 -= should be planned e6clusively for the arrival of this line+

he lenth of the line will be appro6i*ately : -*+

Figure 11

""

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' #roduction tud%

(ollowin the calculations carried out in Anne6 :, and at the sa*e ti*e basedon classified flow curves obtained in Anne6 1 .ydroloy, the e6pectedproduction for the Sut!es-a .ydroelectric ower lant $S/3& is@

1-.-4 G8$2%ear.

he *a6i*u* production of the series obtained was 2B+2? )hHyear,correspondin to the year 1B:B, while the *ini*u* was 10+:4 )hHyear, in1B?3, obtainin a dispersion of F4:K / 4

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- Investment =stimate

#n accordance with the !ustification included in Anne6 ?, the foreseen invest*entfor the construction of the Sut!es-a .ydroelectric ower lant $S/3& is the

followin@

Figure 13

"$

H## EF=!

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1 =conomic !nal%sis

On the basis of established invest*ent costs in the budet and the esti*atedobtainable production, the profitability of this pro!ect has been analyed by,

calculatin the # $internal rate of return&, a co**on indicator of profitability+

his ratio is preferred over the 7= $net present value& calculation, because itdoes not re8uire the introduction of a value that should be decided by theinvestor, as it is the future value of *oney+ hus, an evaluation of theprofitability in absolute ter*s is not obtained, but a value that, however relativeives an ob!ective *easure*ent of profit+

he calculations are presented in Anne6 B, and were carried out in function tothe followin hypotheses and considerations@

• (inancin@ ill relate to the outside financin in proportion to the@

/ 5eveloperXs funds @ 20 K/ (inanced funds@ ?0 K

• -h Sale price@ wo hypotheses are considered@

/ Actual value in Y.@ 0+03?3 WH-h/ Current averae value in the %Z for the special syste* $*ini

hydroelectric plants&@ 0+0

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/ #nvest*ent@ ?+;4 MW/ Averae annual production@ 1?+B3 )hHyear / Concession period@ 30 years

#$1& P

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11 7ocuments ound in current stud%C

eporto ac-round and Ob!ectiveso hysical (ra*ewor-

ocation and description of section of river used )eoloy .ydroloy %nviron*ent

o Alternatives studyo 5i*ensionin of the heado )eneral description of adopted solutiono 5escription of civil wor-so 5escription of e8uip*ent and facilities

%lectro*echanical e8uip*ent@ enerator roup %lectrical facility ine

o roduction Studyo #nvest*ent esti*ateo %cono*ic analysiso 5ocu*ents found in current studyo Conclusions

Anne6eso Anne6 1+ .ydroloyo Anne6 2+ )eoloyo Anne6 3+ %nviron*ental #*pacto Anne6 4+ 5i*ensionin of principal ele*entso Anne6 ;+ Eustification of net heado Anne6

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1" /onclusions

#n accordance with all of the aspects analyed in the feasibility study, andespecially with the results obtained in the econo*ic/financial study, it is

concluded that the current sale prices of electrical enery in the Republic of Srpska, will not result in econo*ic feasibility for the construction of this power plant+

his conclusion will chane if in osnia .ereovina, as is hoped that in thenear future, support *echanis*s are adopted for renewable eneries that willbrin sales rates closer to the averae for the %uropean Znion+ )iven thisscenario, the construction of the Sut!es-a .ydroelectric ower lant $S/3& onthe Su!tes-a iver would be considered econo*ically interestin+

#f finally, and in function of the results of the econo*ic study, it is decided to

advance the construction of the power plant described here, it will be necessaryto develop the correspondin construction pro!ect in which the plannedproduction and costs will be detailed and ad!usted+

#n this particular case, it beco*es a deter*inin factor within the costs toether with the plant, the correspondin e6ecution of the !ac-in pipe+ A eotechnicalstudy with a broader scope that analyes and deter*ines the *ost suitablee6ecution process, which can sinificantly influence the construction costs,should be carried out toether with the construction pro!ect+

arcelona, 5ece*ber 2?, 200;

Carlos .er*osilla #sidre Monon[s lu[s =iver

Civil %nineer %lectric %nineer ro!ect Manaer

Documents

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