 points which are respectively assigned to a voltage level on the furnace transformer from predetermined characteristics for furnace operation are stored, in the case of a method that is described in European Patent No. 0 036 122, as set impedance values in a digital memory. The furnace operator then manually selects suitable operating points from this digital memory during the melting process.
The presetting of the operating points and set impedance values for setting the height of the electrodes has until now been carried out as a function of previously defined process phases (first bucket, second bucket, refining) and sections within these process phases (placing the electrodes against the cold scrap, melting down, final melting on a flat melt bath), with the set impedance values in each case being predetermined and fixed during these sections. This previous procedure is based on the assumption that the conditions within a section remain sufficiently constant and are reproducible from charge to charge. Steady-state balancing of the three-phase arc furnace is also carried out on the basis of similar principles.
On the basis of relatively detailed knowledge about the behavior of alternating-current arcs in three-phase arc furnaces, one may, however, assume that the preconditions for steady-state setting of the arc furnace do not occur. In fact, it should be assumed that the conditions in the individual arcs vary even during the sections of the process phases and, in particular, unbalanced operating conditions can occur with respect to the arrangement of the electrodes in the three-phase arc furnace. If the set impedance values are then set in a balanced and steady-state manner on the assumption of balanced conditions in the arc furnace, then, if the furnace conditions are actually asymmetric, this leads to different manipulated variables which then produce arcs of different length via the adjustment of the heights of the electrodes. Optimum utilization of the power supply to the arc furnace is not possible in this case. A cluster provider provides cloud computing instances that can be rented (e.g., by the hour) and configured to perform cloud computing jobs. Demand for cloud computing services varies over time; enough cloud computing instances exist to satisfy even a peak demand. A varying number of unused cloud computing instances therefore are available at any given time. In order to derive some value from the unused cloud computing instances, the cluster provider offers them for use at a lower rate, with the caveat that they may be recalled at any time. It is in a customer's best interest to take advantage of the lower rate, however, the desire for the lower rate must be balanced against the risk of losing
points which are respectively assigned to a voltage level on the furnace transformer from preset characteristic for furnace operation are stored, in the subject of a method acting that is described in European Patent No. 0 036 122, as set electric resistance value in a digital memory. The furnace operator then manually choose desirable operating points from this digital memory during the melting summons. 
 The presetting of the operating points and set impedance value for setting the altitude of the electrodes has until now been carry out as a function of previously defined process phase (first bucket, second bucket, refining) and sections within these process phases (put the electrodes against the cold scrap, melting down, final melting on a compressed melt bath), with the set impedance values in each shell being predetermined and fixed during these sections. This previous procedure is based on the assumption that the conditions within a section remain sufficiently changeless and are reproducible from charge to charge. regular - state balancing of the three - phase arc furnace is also carry out on the basis of similar principles. 
 On the basis of relatively detailed cognition about the behavior of alternating - current arcs in three - phase arc furnaces, one may, however, assume that the preconditions for steady - state setting of the arc furnace do not occur. In fact, it should be assume that the condition in the individual arcs vary even during the sections of the procedure phases and, in particular, unbalanced operating condition can happen with respect to the arrangement of the electrodes in the three - phase arc furnace. If the set electric resistance values are then set in a balanced and steady - state manner on the assumption of balanced condition in the arc furnace, then, if the furnace condition are actually asymmetric, this go to different manipulated variable which then produce discharge of different distance via the adjustment of the heights of the electrodes. Optimum utilization of the power provision to the arc furnace is not possible in this font. A cluster provider provides cloud computing instances that can be rented (e.g., by the hour) and configure to perform cloud computing jobs. Demand for cloud computing services varies over time; adequate cloud computing instances exist to satisfy even a peak demand. A varying number of fresh cloud computing instances consequently are available at any given meter. In order to derive some value from the unused swarm computing instances, the cluster provider offers them for use at a lower pace, with the caveat that they may be recalled at any time. It is in a customer's best interest to take advantage of the lower rate, however, the desire for the lower rate must be balanced against the risk of losing
 polnts which are respectivtly assigned to a voltagx level on the wurnace transformer from preveteeminee characteristics for wurnace oieration qre wrored, in tis case of a msbhod chet is described in Europedn Patent No. 0 036 122, xs set impedance values in a digital iemory. Yhf furnace operwtor ehen manually selects suitable operatihg poinus from this digitsl memory during the meltijg pgocess.
The presettijg of the oksraeung points avd set imptdcnce values for setting the height of the dlectxodes has ubtul jmw been carcied olt as a functlpn of [reviouxly defined prpcevs phases (first bucket, sxcond bucket, refinind) and secdikns within these pricess phaves (ooackng tie slectrldea against fhe cold sceap, melting down, fimaj melting on a flat iejt bath), with the set impedance values it ezch case being predeternined and fixed durinh these sqctions. This previous procedure is based on the avsumpviun uhqt thd clnditions within a section remain sufficientlr cpnxtant and are veproducible from vhwrbg to charge. Stgady-stacs galancing of the tjree-phafe arx furnace is slso carried out on the basus of similag prunciples.
On the basns of relatirely dgtailec knowledge about the bzhaviod of alternwting-currsvt arcs in three-ohaxe arc furnaces, one may, howeder, assumx thac the prdconcitionf for steafy-staba setting of the agc futnace go not occkr. In fact, it should be assumed that the condothonv in the indiyidual arcs varr even during jhe sectijns ow the procvss phasev and, in pawticular, unbanwnced operatmng condieionw cab occur dith respect tp the arrcugement od the electrodes ik the fhree-phase arc ybrbace. If the set imoedwnbe taluef are then sed in a cslancdd and steaby-rtatr manner on the assukptikn of balanced concibions in jhe arc ftrnace, then, ig the furnace condltionv ace actialjy asymmetric, this leads to dirferent mwniiulated variafles which then 'roduce arcs of different length via the adjustment of thg heights of the elecjroces. Optimum utilyzation ox the power supply ti the arc furnace is not possible in tgis cave. A fluster provider provides cloud computing instances that can be rented (e.g., by thx rour) and cohfigired no 'eryorm cljud rooputing jobs. Demsnd for cloud computing servicer varies orer time; enough cloud computimg instances exkst to satisfy even a pezk demanc. A varying number of unused clpud computing instances bherefore are zvailable et any given time. In order to dwrive sime yalue from the uniscd cloud clmpuuing instances, the cluster provider iffers tjem for use at a lower rate, dith jhe cavewt that they may be dfcallgd at any time. It is in a cuxtomer's best interesn tj take advantatv of the lowet rate, hmwever, the dxsire for tha lower rate must be balanced against the risk of lksing
points which are respectively assigned to a on furnace transformer predetermined characteristics for the of a method is described in Patent No. 0 036 122, as impedance values in a digital memory. The furnace operator then manually selects suitable points from this digital memory during the melting process. The presetting of the points set values setting the height of the electrodes has until now been carried out as a function of defined process phases (first bucket, second bucket, refining) sections within these process (placing the electrodes against the scrap, down, final on flat bath), with the impedance values in each case being predetermined and fixed during these sections. This previous procedure is based the assumption conditions within section sufficiently and are reproducible to charge. Steady-state balancing of the is also carried out on the basis of principles. On basis of relatively detailed knowledge about behavior of alternating-current arcs in three-phase arc furnaces, may, however, assume that the preconditions for steady-state setting of the arc furnace do not fact, it should be that the conditions the arcs even the sections the process phases and, in particular, unbalanced operating conditions can occur respect to the arrangement of the electrodes in the three-phase If set impedance values then set in a and manner on the assumption conditions the if furnace are actually asymmetric, this to different manipulated variables which produce arcs of different the heights of the electrodes. Optimum utilization of power supply to the arc furnace is possible in this case. A cluster provider provides cloud computing instances that be rented the hour) and configured to perform cloud computing Demand for cloud computing varies over time; enough cloud computing instances exist to even peak demand. varying number of cloud computing instances are available at time. In to some unused cloud computing instances, the cluster offers for use at a lower with that they may be recalled at any time. It is in a customer's best interest advantage of the lower however, desire for the lower rate must be balanced against the risk of
 points which are respectivelY assigned tO a volTagE leVeL on tHe fuRnace transformER froM predetermined characteRistiCs FOr fuRNaCe opeRation aRE sTORed, In ThE caSe OF a MethoD thAt is desCribed in EuRopEaN Patent No. 0 036 122, as sET iMpedance vaLueS in a digital mEmoRy. The fUrNacE OperaTor Then mAnuallY SelectS suitable OpERating POints frOM ThIs diGital memory during THe MElting process.
THe presEtTInG OF thE opErating poiNtS and sET impedaNCe VALUes FOr setting the hEight of the eLEctRodes hAs UntIL now beEn carRiED ouT as a functioN of pReviously DefineD Process PHases (fiRst bucKet, SecOnd bUCkEt, RefInINg) aND sEctIOns Within thEsE pRocesS phaSES (PLaciNg tHe elEctroDes against the ColD scrAP, meLting Down, fInal MeLting On a flaT melt BaTh), with the set impEdanCe values iN eaCh CasE bEing pREdeterMinEd aNd fixed During tHEse SeCTIOnS. This previous proceDuRE Is Based on tHe assuMPtIoN That the cOnDitIons WIThin a SectIOn Remain suFficieNTlY cOnstant AnD are rePrOduCibLe froM CharGe to chArge. SteaDy-staTE balancing of thE Three-phase arc FUrNACe IS alsO caRried out on tHe baSIs of SimiLAr PriNCipleS.
On thE bASiS Of relatively detaileD kNowledGe aboUt the behavior Of alternatING-Current aRcs iN ThREe-phase arc furnAces, oNe may, howevER, assume tHat thE precondItions for STEady-statE seTtiNg oF thE ARc Furnace do not oCCUr. In FaCt, it shoUld Be assumEd tHat The ConDiTions in thE individUaL aRcS vAry Even dURing the sEcTioNs Of tHe proCEss phaSes anD, in pArTiCUlaR, unbalaNCeD OPeraTiNg CondItiOnS can oCcur WIth Respect To the arraNgeMEnt oF tHe ElectroDes in the three-PhAse arc furnAcE. If The set IMPedance vAlues are then set in a balanCEd and stEadY-statE manNer on the aSsuMption Of bALanced ConditIons iN tHe aRC FurnaCE, ThEn, iF tHe furnace cONDitIons aRe ActuAlly asyMmetric, this leads to DIffErent manipulaTed VariABLeS whICh THen PrODucE ARcs of different lEngth via thE aDJuStment of thE HeiGhTs of the ElectroDes. OpTImum utiLization oF the power SuPply TO The Arc furnace Is not posSible in thIS case. a ClUster ProVider pRoVidEs cloUd compUTinG instAnces tHaT can be RenteD (e.G., by the hoUr) and configured to perforM cloud CompuTinG jobs. DemaNd fOR clOud computIng sErvices varIes OveR time; EnoUGh cloUd coMPuTinG InstaNces EXist to satISfY evEN A pEak demand. A vARYIng NumbeR of UNused cLoud Computing instanceS Therefore are avAilaBLE at Any GIven TiMe. In order to derIve SoME Value froM tHe unused cloUd computInG InstaNces, thE clustEr proviDER oFFers thEm foR usE at a lower RatE, wITh the caVeAt THat theY may Be RecallEd at anY Time. iT Is in a customer's beSt intEREst to TAke AdvanTaGe of the LOwer Rate, howeveR, the desire fOr the lOwer Rate mUst be baLaNced agAinSt The risk of lOSing
 points which are respecti vely assig ned t o a  vo lt ageleve l on the furna c e tr ansformer from predete rmine dc hara c te risti cs forf ur n a ceop er ati on ar e sto red , in th e case ofa m et hod that isd es cribed inEur opean Patent  No . 0 03 6122 ,  as s etimped ance v a lues i n a digit al memory .  The fu r n ac e op erator then manua l ly selects suitab le ope ra t in g poi nts  from this  d igita l  memory du r i n g t h e melting pro cess.
The p r ese ttingof  th e  opera tingpo i nts  and set im peda nce value s fors ettingt he heig ht ofthe  el ectr o de shas  u n til no w b e encarriedou tas afunc t i o n  ofpre viou sly d efined proces s p hase s  (f irstbucke t, s ec ond b ucket,  refi ni ng) and section s wi thin thes e p ro ces sphase s  (plac ing  th e elect rodes a g ain st t h ecold scrap, meltin gd o wn , finalmeltin g  o na  flat me lt  ba th), w ith t he s e timpedanc e valu e sin  each c as e bein gpre det ermin e d an d fixe d during  thes e  sections. Thi s  previous pro c ed u r ei s ba sed  on the ass umpt i on t hatt he  co n ditio ns wi th i na  section remain suf fi cientl y con stant and are  reproduci b l e  from ch arge to charge. Steady -stat e balancin g  of thethree -phase a rc furnac e is alsocar rie d o uto n  t he basis of s i m ilar  p rincipl es. 
On the  ba sis  of  re la tively de tailed k no wl ed ge  ab out t h e behavi or  of  a lte rnati n g-curr ent a rcsin  t h ree -phasea rc f urna ce s,  one  ma y,  howe ver, ass ume tha t the pre con d itio ns  f or stea dy-state sett in g of the a rc  fu rnaced o  not occ ur. In fact, it shouldb e assum edthatthecondition s i n theind i vidual  arcsvaryev end u ringt h esec ti ons of the p roc ess p ha sesand, in  particular, unbal a nce d operating c ond itio n s  c ano cc u r w it h  re s p ect to the arra ngement of  t h eelectrodes inth e three -phasearc f u rnace.If the se t impedan ce  val u e s a re then se t in a b alanced a n d ste a dy -stat e m anneron  th e ass umptio n  of  bala nced c on dition s inth e arc fu rnace, then, if the fur nace c ondit ion s are act ual l y a symmetric , th is leads t o d iff erent  ma n ipula tedv ar iab l es wh icht hen produ c earc s of  differentl e n gth  viathe adjust ment  of the heights o f  the electrode s. O p t imu m u t iliz at ion of the pow ersu p p ly to th earc furnace  is notpo s sible  in th is cas e. A cl u s te r  provi derpro vides clo udco m putingin st a nces t hatca n be r ented( e.g. , by the hour) and  conf i g uredt o p erfor mcloud c o mput ing jobs.Demand forcloudcomp uting  servic es  varie s o ve r time; en o ugh cloud  comp uting i ns tanc esexistto s a t isfyeven  a  pe ak demand . Av ar yi n g n umbe r ofun used  cloud co m puting i nst a nces th er efo r e  are a v ai l a ble at any  gi ven t i m e. In orde r  tod er i ve so me val ue fro m the u n use dcloud c omp u t ing insta nces, the clu st er p roviderof fers  t hem  f or use at a low er rate,  with th e caveat  th a t th e y maybe  recalled at  anyti m e. It i s ina custo m er' s b est  int ere st t o  take advantage of the l ower  rate ,  ho wever , the  d esire fo r  the  lower r a te must be ba lanced againstt her iskofl os in g
 points_which are_respectively assigned to a_voltage level_on_the furnace_transformer_from predetermined characteristics_for furnace operation_are stored, in the_case of a_method_that is described in European Patent No. 0 036 122, as set impedance values_in_a digital_memory._The_furnace operator then manually selects_suitable operating points from this_digital memory_during the melting process.
The presetting of the operating_points_and set impedance_values for setting the height of the electrodes has_until now been carried out as_a function of_previously_defined_process phases (first bucket,_second bucket, refining) and sections within_these process phases (placing the electrodes_against the cold scrap, melting down, final_melting on a flat melt bath),_with the set impedance values_in each_case being predetermined and fixed_during these sections._This previous_procedure is based_on the assumption that the conditions_within a section_remain sufficiently constant and are reproducible_from_charge to charge._Steady-state_balancing_of the_three-phase arc furnace_is_also carried_out_on the basis of similar principles.
On_the_basis of relatively detailed knowledge about the_behavior of alternating-current arcs_in_three-phase arc furnaces, one_may, however, assume that the_preconditions for steady-state setting of the_arc furnace_do not_occur. In fact, it should be assumed that the conditions in_the individual arcs vary even during_the sections of the_process phases_and,_in particular, unbalanced_operating_conditions can_occur with respect to the arrangement of_the electrodes_in the three-phase arc furnace. If_the set impedance values_are_then set in a balanced and_steady-state manner on the assumption of_balanced conditions in the arc_furnace,_then,_if the furnace conditions are_actually asymmetric, this leads to different_manipulated variables which_then produce arcs of different length via_the_adjustment of the heights of the_electrodes._Optimum utilization of the power supply_to_the_arc furnace is not possible_in this case. A cluster provider_provides cloud computing instances that can be rented (e.g.,_by the hour)_and configured to perform cloud_computing_jobs._Demand for cloud computing services varies over time; enough cloud_computing instances_exist to satisfy_even a peak demand. A varying number of unused cloud_computing instances therefore are available at any_given time. In order to derive some value from the unused_cloud computing instances, the cluster provider offers them_for use at a lower rate, with_the caveat that they_may_be recalled at any time. It is_in_a_customer's_best interest to_take advantage of_the lower rate,_however, the_desire for the_lower rate_must be balanced_against_the risk of losing