GB2480708A - Transformer based voltage optimization - Google Patents
Transformer based voltage optimization Download PDFInfo
- Publication number
- GB2480708A GB2480708A GB201014460A GB201014460A GB2480708A GB 2480708 A GB2480708 A GB 2480708A GB 201014460 A GB201014460 A GB 201014460A GB 201014460 A GB201014460 A GB 201014460A GB 2480708 A GB2480708 A GB 2480708A
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- United Kingdom
- Prior art keywords
- transformer
- current
- received
- voltage
- winding
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/24—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/343—Preventing or reducing surge voltages; oscillations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
A transformer based voltage optimization apparatus 201 is used in an electrical circuit comprising a load 202 and comprises a first transformer 203, to transform received electrical current at a first alternating voltage 204 into second voltage 205, and a second transformer arrangement 207 configured to reduce a frequency component of the received electrical current that constitutes electrical noise. Transformer 203 can be a buck-boost transformer, increase or decrease voltage and include insulated primary and secondary windings. Transformer arrangement 207 can be a third winding either wound on the same core or on a separate core, separately housed, and be a zero sequence harmonic or zig-zag winding. Plural frequency components can be reduced, including harmonics of the received current, and their frequency selected or adjusted. The received current can be split into current phases, by phase shifting, and shifted by 180 degrees to cancel each other out. Harmonics emanating from noise sources such as information technology equipment, high frequency lighting and variable speed drives can be reduced, increasing the life and efficiency of voltage optimizing equipment.
Description
MPROVED APPARATUS & METHOD 114 RELKflON TO VOLTAGE
OPTMZATON
R&d of the hwenUon S The present flVGflDOfl reates to an mproved apparatus a:d meu-oci n e 1er L) o 1c cw N1re Oar ( - bkJt 11L t \t t. \ C' I r&ates to voRage opUnizaflon n reaUon to O'OriI:3tC buikings, such as, tor 0 BajgroundtojjjJriventon itis known to instaU in domestic and industial premises of one kind or another one or more transformer based voltage optmza0on devices in order to m) e eVcec, tern's or th< ameut of 3tCc", ctvo ors. v; nON -to st 3s a pohCr pr Tpca sC' 3 t Sub. .) ii s wUl comprise supply of an alternating current (ac).
The >er v v tranrme basec tage opt' ato ccv cC as s*x etd as ct rt)rsc a;rar5toflc.o t'e rastcr_ a is W'a oape o i ecano tE V3ltd\)t ThE s kr.
je r, c 4ha secoo e'et'r' c' a's Pc' ceso tk'o resultant voltage is thereby increased and said to be stspped up" Similarty the fIrst alternating voltage may he higher than the second alternating voltage in which case the resultant voltage is thereby decreased ano' said to be "stepped down" rLA1 cY\ a5 hr se t.C ad n "o ar g n'Ur stand c a rl c be used in different countries as to what is meant by a "transfbrmer based voltage oomrzarc1 dek cc or exarnoe o uaon ftc uvjer \ " O \3 dçe)p»=_v uPt im:aty' dence " to h Ss or n, t1tacC rouc c teLhno og Uge eoc' a cc a o tace op rr tat o tea a cgv ano oltage ch z h r' C t usea a c essentially reiate to the same subject matter of a "transformer based voltage optimization device" as defined above.
?\ ar:stc::'-'-)c?SC votage OtriZ-t3 ()K>3 flc DC' SCC fl fi W;de var'aty 3 s:tudtors h.erefr a power suDr1Y 0 raquired O urovd 3xerOa icod rf rwt cnn nr Tb c fnr,vnnrn t nnc nsc c nr'.; k t;:' -3-! A current. approach as is used oy various ccrnpanies thai.
vataDe DQtmztK)n equipment s to se:ect 2 spedflcdesgn. A popular design so seected is known as a "buck-boost" transformer. This type of transformer design s we known and has existed n the pubc doniain for many years. However. the apr' cc::to cf o CK-CCOS:?aisforer *ec R>Ou re tzn) C}urxo o o-'c r 5d' nqs s t th / 15w As those skilled inttle art will understand a buck-boost transformer is a single oria btrb.Ac +rais8rrr*cr &cund wt' rç'ca lid 2-c ( \ic-r> mar in windings with isolated secondary' windings typically 12, 16, 24, 36 or $8 Voile. As or-"cd aro \\OJ C he oucK-boos ta stcr' s an s atno astur"e electrical separatRDft between primary and secondary windings. However, the connection to operate as a buck-boost transformer requdres that the secondary is connected to the feed side of the primary winding hence eliminating the electrical s separation.
Depending upon the connection between the primary and secondary w rJ'gb I'E. -car x.. used to buck n'c cc o boos' cc-ease e Vc -c a a 3l oecent3çe t p calls a noar cu -"e a " r m "\ n) K anr' -s of the huck-ncJs. i3nso cJ\ e owen.
motors which are wound for higher voltage than supply or stepping up line o tce o a i.s. >c-rr smstc lascs a c otce tep acciss a network, Although buck-boost voltage optimization units are single phase units they are commonly wound onto a common iron core and used to operate on three pnase e ect cc cowet supohes The conecc i'owee oil an' a e seco 03'\ windings means that the unit effectively becomes an auto-transformer and hence it cannot be used for isolation. purposes. Buck-boost units are used for energy up r Zat r r sop caw" s r aomesc' a c ouso a "c rmto, S Oe 1\ they tend to be smaller, lighter, and cheaper to rroduce than various other types of transformer. Furthermore buckboost transformers are caoabe of' handng Wa raUnqs hetwee-n 5 tolO tmas of the rated Wa as an soahng transformer.
A -I r r'rr rr. n r'k-floc m a " \0'r 3 3 iransfcsrrners) do not spec:fIcaHv take nto account tre ever ncreasnq procñern O Ectrca nose tnarnic:rlcs). T'husas ooranes nstafl lore orrnauon tenInnr: r xfçj nn,nt.2nd nvst rl rnncA ni2rrv.Q2Vflfl ck!v nS and SOk)V (fle present appheanUempOyer 01 the flvC! tc:rs Of the nVf&flhOn Of concern in the present appicafion.
The nrohktrn ot harrnoncg curren hi. as uier;tt;oc above is orcerned vhh ,-..4:*- *;: safety can he an issue. particuiarty when usng mains voftages. Thus it is desirabie to adempt to reduce harmontcs cun'ents in a suppiy voftage using a transformer that has separate windings in order to isoiate the primaRy winding from The seconOan kt n q aru tnerefort to en'croe sate.\ thdt}or C S transformer.
The probieni of eiectnca noise (harmonics olstorilons) is an increasing probiem. There is therefore a need to minimize or remove, harmonics from eectricai power suppiles in order to enabie ail the eieotricai equipment (the oad) Ic on a given site to operate more efficientiy whilst attempting to improve energy savinos and the iife expectancy of voitage opflmzat}on equipment. The iatter objective is required to be achieved with a transformer that comprises separale windings in order to isolate the primary winding from the secondary winding so as orcudo o de. n * ia' has}moro,ed sarFQ teat as as compao w K fi' at rc oceec or an autoh dnsfoter* §niano tbelnvenUon On" otcc4 rf mpscnt nventio is tc c udt a ra o e Io optimization apparatus that provides enhanced energy savings compared with 2 2 pnor art devices.
Another ohiect of the present invention is to provide a method ot transforming rs voray c a scrcrm.oitage wherein r' q' savngs r myove'1 cc oarec
with prior art methods.
A further object of the present invention is to' provide a transformer based vonage optimization apparatus that is configured to provde an output current that oorpuss reaucea ann..rt ct electnca uc se sn. e e a rca current as received from an electrical power supply.
Yet a further obect of the present nventop. s to orovide an apparatus and a method for transforming a fIrst voitage to a second voitage wherein the second VU L us & <ssou td wtr a red ned aeJree c e ecrca roe as cc " > W the fiost voltage.
a urter otiec: o te veser't rron r 5 p jro ( e i. rs o et usec o tags opt "ntion apcrxus that is cor"q ec' sri tra a as4 re kX'Lttf A component of a received eectrica corrent is reduced or suppressed in comparison to the eiectricai current that is output from the apparatus.
Yet a further ooject of the present nventon s to provlo'e a method of transformino a supplied eiectricai voltage into an output eectrica voitage wherein at east one frequency component of the eiectricai current that is received is L st"r ak o ot cvno\ec "nerebv c eaYc Y' outp c r Ott ca cr-c " * -c& is free of or substant.ianv tree of s.ad at least one frequency component.
Yet a further object of the present invention is to provide a transformer based n4np ont cmraton appa-aLs 4n cciiprsc a treqstcrms t?V)t t\ c \\ti rus rd the i s c ecuue o suppress a one r ise. j s en c- :20 received eiectdcai current so as to provide an output current from the apparatus that comprises none. or substantially less of said' at ieast one trequenc component and wherein the apparatus is configured for safe use with. in particular, a mains power supply.
os According to a first aspect of the present invention, there is provided a rensro me" oaseo voltade opttm zat( a a'itus red 0 J)t CS C cornoonot r4 sa esc'-cal c rcuit that coprtses a aad sa o a.pa a comprising: a first transformer arrangement specifically configured with means to rans\'rr ece e1 e ecm;al c rent suuoad at a f*t c emtng o ge o dectrical current at a second atternating voftage; sac aucaras cv rurtcr 5'r\ a second transformer arrangement specifically configured with means to reduce at east one frequency component of said received eectricai current Mi-ire n scd.. east os ecuenc cc rroon-v cor b\ Jes U5 o eiectricai noise.
Preferaciy sad means to transform sac: recewea eiectnca current of said first transformer arrangement comprises a core, said core having a primary winding and a secondary winding.
terat'K' an c trkaI rsthntcd,rpç s L'O' con t ontwrer;; windino and said secondary winding.
Preferably said primary winding and said secondary winding are connected or ccnnectabe such that said second aiternatino vdtage 5 OW& than said first aiternating voitage.
Preferabiv said primary winding and said secondary winding are connected o cc r'ct±e $ a sad crd te'-tng otage afternating votaqe.
tc rs tra sforrer c'rr. cut co rce boo transtormer. I 0..
Preferably said means of said second transformer arrangement configured to reduce said at least one frequency component of said received electrical current compnses a third winding.
Preferab aa thrd wr ting s formed ak\ i -n ci cc' .3 r &s catec v ad nnn'n a C a ci secodarv onos Preferably said third winding isfo rmed about a second core, saci second core separate from said core that is associated with said primary and said secondary windings.
Preferably said second transformer arrangement is configured asastand aione unit.
is Preferabiy, in accordance with a preferred embodiment of the present.
nvention: said first transformer arrangement comori.ses a protective. casIng that houses s.3( mt.c'i's c trpnAfnrm sac receed aec%rca Ot$er' 5u30L 2 aitemating voltage into electrical current at a second alternating volta e; and said. second translormer arrangement is housed outside said protective casing.
Preferably said means of said second transformer arrangement configured to reduce said at least one frequency component of said received electrical current Is ccmgreo to rndue p urotv o frsqucrc, c'o onrs ot s; n cce o e<ectca current.
Preferably said means of said second transformer arrangement configured to reduce said at least one frequency component of said received eie.ctrical current is -i i further configured such that said at least one frenuency component is predetermined.
Preferably said means of said second transformer arrangement configured S to reduce said at least one frequency component of said received electrical current s so taL e oioer to facutate select on c sac a es one t co\e9cv to reduced.
Preferably said second transformer arrangement comprises a zero sequence harmonic winding.
Preferably said means of said second transformer arrangement configured to reduce said at least one frequency component of said received electrical current is, with respect to the supply frequency configured to reduce a harmonic frequency crrrrone_ o so I mece yea e ecudl curten Preferably said second transformer arrangement is configured to adjust the r use dm ge o least or'c reqer cc nc' rr sr' rocer c o cct current in accordance with a phase shifting process.
Preferably said phase shifting process is configured to split said received elect oa currer ma a firs owx wront ro szcorc. AC each said output current is out of phase with the other.
Preferably said respective output currents are, with respect to each other, phase shifted by i8O in order to thereby cancel each other out, According to a second aspect of the present invention there is provided, in relation to transforming received electrical power, a method of reducing electricaL > n. s-m t'o oJ e e,tual oer sale e4noo cha ar;rsci o rç "ns tc 1e steps of: 9..
transforming a receJved electrical current suppUed at a first alternating uo no cisC L curm a seco aitem cg c uge a ss foal \ redLocg at was. o fren c.crL\ a c s 0 ceeC electricaL current wherein said at least one frec.uency component corsututes a frequency of said electrical noise.
P era ab u stet. 0 trantorm nç suO rCUe\e\ &e.. .. fl S performed by a first transformer arrangement comprising a core, said core having a primary winding and a secondary winding.
Proterably said primary winding and said secondary winding are electricafly nsulated from one another.
r'rcfn'Ln seo nnma wfod g anu sc secuncu \ q c ccnrt ted or connectable such that said second alternating voltage is lower than said first alternating voltage.
2 Preferably said. primary winding and said secondary winding are connected or connectable such that said second alternating voltage is higher than said first aiternatina voltane.
Preferably said first, transformer arrangement comprises a buckboost 0p uabh zmn steo & spec cal eox.cnq è Lt.. C component of said received electrical current is oerformed by a third winding.
prerao\ so -wa i nd ng s tonnuc 3et san cc rc' a4 s acscaren said prinmuy and said secondary windings.
Vcie c't"e -k" 55 a th d nong a c'mad ao ecc; a s J second core separate from said core that is associated with said primary and said Set 0 ua "1 flt1-precerubr sara serd core sic said c ncng:rc 00 as dart U a sa c a onc L Preferabiy said step of transforming said received eiectricai current supplied It) at a fIrst aiternating voitage into electricai current at a second aiternating voitage is performed in a separateiy housed unit to said step of specificaliy reducing said at ieast one frequency component of said received eiectricai current, said separateiy housed unit comorisinq a protective casing.
sa step o soenficalv rcn.cn'g sac t c' qne component ot said received electrical current reduces a plurality of frequency components of said rce1vCti eectiical current.
Preferably said step of specificaliy reducing said at least one frequenc component of said received electrical current reduces a frequency component that isoredetermined.
Preferably said step of specificaliy reducing said at least one frequency component of said received electrical current comprises the further step of cs adjustably selecting said at least one frequency to be reduced.
Pefereus caiu step at soeufica lv recc N sad t eas u a component of said received electrical current comprises use of a transfoniier arrangement having a zero sequence harmonic winding.
Preferabiy said step of specificaUy reducing said at ieast one frequency component of said received eiectricai current that constitutes a frequency of said eiectricaj noise comprises, with respect to the suppy frequency, reducing a harmonic frecuency component of said receved eiectncat current.
-afema sac stco of specthca r' e u ta5 CN qc component ci said received &ectricai current that constitutes a frequency of said ejectricaj noise composes adjusting the phase angie of said at ieast one frequency component of said received ejectricaj current in accordance with a phase shifting process.
Preferabiy said phase shift' .ng process spiits said received eiectocai current into a first output current and a second omput current such that each said output current is out of phase with the other.
e;aov a a scec4 e outuu cu *erts a e wft resae, i c\e phase shifted Lw 180° in order to thereby cance each other out.
Accj'o op o a "rd as ec of the cre2tct ryan "ere n r"o" eec 7.0 transformer based voitage optimization apparafus (201) configured for use as a component of an ejectncai c{rcud that composes a ioad, sad apparatus come aw' a wet "rao3f,rre arrange ient sptc bav cc ccea vt L" ea > tnsfovn reced eecfi cal cunent supeheu at a fs a0en'a ig o age D electrical current at a second alternating Voi:t5'ge said means to transform said elarrral unent ccrpusng a coka, sac core "3\ n,, a p r"r' t and a secondary winding, o said apparatus characterised by further comprising: a second transformer arrangement specificaliy configured with means to reduce at ieast one frequency component of said received eiectricai current whereJn said at least one frequency component constitutes a frequency of elecrcci ose J'at sLbstanfiaUy comrses a harmonic tont OflC\ nc ro\Cd eiectdcai current, said means of said second transformer arrangement configured ) cucc SaiC q £OS 019 t'OOu&ncy corco er ot sac ace sOC e eC c rert crons nc t' ic w no r'g cor tgu t acust e rnase sc c sac a' ieast one frequency component of said received eiectricai current in accordance with a phase shifting process.
According to a fourth aspect of the present invention there 5 provdeC, in reiation to transtorninq received electrical power, a method of reducing eiectricai nose r Ye o ala. rcai pc've sin meoc ciatact&' sac o' c o s steps of: transfon-ning a received electncal current supptied at a first. alternating cae Ic eie r'. rrcnt ct a sconce a t rerr vo tqge ec specfflcaly reducing at least one trequenc component ot said:receivec electrical current wherein said at least one frequency component constitutes a frequency of sad electrical noise, said at least one frequency substantially comprising a harmonic frequency of said received electricai current, wherein said step of specifically reducing said at least one harmonic ura oncy r-" "pu iert comunses tne step o c»=2Jubtlng ha 1'hasn cac of sri at least one frequency component of said received electrical current in accordance with a phase shifting process.
According to a fifth aspect of the present invention there is provided a C rarst3rme cased vckaue oiY mzatio ap 3r tt s 2c otij 01 c 39 as a component of an eectdca efroult that comprises a kd, ad apparatus compnsnq: a first transformer arrangement spech9cafly configured. with means to s transform received electrical current supped at a first alternating voltage into c ot ce 2rert t a secona alternab ic itsce sad men s 22 C'1$O' saC reoeved electrical current comprising a core, said core having a primary winding and' a secondary winding., said apparatus characterised by further comprising: a second transformer arrangement snecitically configured v1th means to reduce at least one frequency component of said received electrical current w a n c at oa ore Crfl4L cnn cot'on a ro " as -squen t) o electrical noise that substantiaRy comprises a harmonic frequency of said received electrical current, said means of said second transformer arrangement configured to reduce said at least one frequency component ot said received eiectricai current rernysrn a o qucnrc ha manic wccng that s cant grcd C s' "s onse enqe ot sac ens oie enc cTpuIertot ed *cee2 ee!= 2 c current in accordance with a pflase shifting process.
According to a sixth aspect of the present invention there is orovided a in relation to transforming received electrical power, a method of reducing eiectricai mYse The cutput maci ice no\tei sa c mencr ciaacte'sad by acv'v s tc ele)S)t rnnstrv ng a reeksec eleutrk,a cerer si pp or' 4 e r: mtcrna4 c voltage into electrical current' at a. second alternating voltage; and' snccira edc' ng at least one em. e Cl eocr' Ic" S se C rece»='ao electrical current wherein said at least one frequency component constitutes a A 7..
frequency of eectrica noise. sak at east one frequency substanay comprising a harmonic frequency of said received etectricai current, wheren said step of specifically reducing said at ieast one harmonic frequency component utiiises a zero sequence harmonic winding that is configured: 0 do s4 r e a se ançc o sad at east o a aq.erc\ co'nu(ron o sa r received eiectricai current in accordance with a phase shifting process.
Brief Des crjpjpn of the Drewin S For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way cf exampe. oniy, specific embodiments, methods and processes according to the present invention with.
reference to the accompanying drawings in which: scr'r ca fi stiates, n the c a n c.. t ag am om no p-ic r at nu. k-co st pe tra sformet a terred 10 n *ne ea e Se 30 er
"BacKground to the invention; and
Fig. 2 schematically illustrates, in the form of a circuit diagram, a first transormer arrangement and a seconc transformer arrangement as are connected and configured in accordance with the present invention.
Qcte4c� Descriptkn There will now be described by way of exampie a specific mode ccre lip abed tr'e renors In the t.iIo g doscrY or rL ue35 sçect C deaHs are set tor r' oroer tc pros oe a tocug' ..$cetstanfl r w no aocarent owe' o-0 oe skiled n tre fl 5' P h fls0 on uc practiced without llmitation to these specific detalls. In other instances, well known methods and structures have not been described in detail so as not to
3 0 unnecessarily obscure the description.
SCe1t' ilftistra!es. in the rorm or ac rcuu. cJaqram, the best mobe contempated by the Thventors n reation to prov'thnc: a transformer oasec voflace ootmzaflon aevee that overcomes the atorementoned orobem of unwantac -1 * transformer as configured for stepping down an nput (first) alternating voltage.
The second transfonner arrangement, 20$, preferably comprises a zero sequence n n rq 17 Thrn w *ct r-tt k nrr tfl 2O-The zigzag or zero sequence wnthng" $06 Is herein descrbed as the HM\N (Harmonics Mitigation V\Thding). The HMW may be induded as a thfrc "tea' rcfl9 c'r cote 20a 3rStier arranpeme4 233 rccer trC r\-4rLh g the matter it has been found that this creates increased ev&s of waSt'etLfl cfrcuiating currents within the core. This in turn reduces overa effIciency 0) the voltage orrnzaton apparatus and also to ces ne err.con c"i hzrr s o trons a cre n the system Fo t a teaser r ic rs4 r'cc cinteapate, the present invention is preferably configured such that the HMW is rouceo as a e)arate un t tnrn tie ra enoosure "os I3 C t7'srtrrV 1 0 arrangement 203 or. preferahiy, as a separate unit that is installed next to transformer arrangement 203.
As those skifled in the art will understand, in its own right transformer arrangement 203. in the form of a buckboost transformer in the example shown, is wiil, in itself, have a beneficial effect in relation to reducing harmonics aithough it is O)e r0e. tn t a r ot des qneo o so.. a f tet fur ne ber"no ca T..e beneficiai effect just described is due to the inductance of transformer arrangement 203 and this may be increased by virtue of inserting an ele.ctricafly Jated s men reiv ean re prrar ond etriay w or s $e or Us inserting an electrically insulated screen between winding 209a and 210a and between winding 209b and winding 21 Ob and between winding 209c and winding 21 Oc.
n accc'tOa L.e vtr $)e Drestnt,P\ enL on i 5r0 " ot the \ \ o oak ananues te e&c o reducng harmocs and the -av aerrvey an "tuned" or otherwise adiusted so as b provide the requked benefits (reduced narroro Jnents) at one or more ha on rrequocos m<t te t'c,a encounteree.
In the best mode contemplated, in accordance with the present invention, the preferred method of reducing or potentially eliminating harmonics comprises the technique of phase shifting, Thus. in accordance with the best node contemplated, the HMW uses a phase shiftng process. in this way the electrical JCWE' 5 jfl\ s StIfl ntc' wo scp'ratc o tJ' ac r' O. S C' . c' nhz 5) w-ti the o,he anc ueates the effect of a ella o Thus as tbese s\ ed t"e a will thereby appreciate, the idea is to create an interference situation such that ideally the current pairs cancel each other out. To achkwe total cancellation a 1800 phase shift between the harmonic cmrrent pairs is required.
in view of the above those skilled in the art will appreciate that the examples o given are for the purposes of illustration only. More generally the application relates to the use of two technciogies in combination in order to create a single prode:t tp y hqh energ rr'gs hrw gh c taco an m:ator' crr) n li wrh couotoi c arnurc cnents on q a asL Aitr og CA tx ot trcn rmer_ c transformers are ceuei.e1 iowr i ti e tY o domain their use as described: in combination herein is, before the present mertc'n ro4 o'anuse owri o the ne tor i t s ncna bes *er' found to provide significant benefits in relation to energy consumption and anJ t..av t ene in nild n tc rcdcing ca bo omisstor's
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201014460A GB2480708B (en) | 2010-09-01 | 2010-09-01 | Improved apparatus & method in relation to voltage optimization |
| PCT/GB2011/001205 WO2012028839A2 (en) | 2010-09-01 | 2011-08-11 | Improved apparatus & method in relation to voltage optimization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201014460A GB2480708B (en) | 2010-09-01 | 2010-09-01 | Improved apparatus & method in relation to voltage optimization |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201014460D0 GB201014460D0 (en) | 2010-10-13 |
| GB2480708A true GB2480708A (en) | 2011-11-30 |
| GB2480708B GB2480708B (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| GB201014460A Active GB2480708B (en) | 2010-09-01 | 2010-09-01 | Improved apparatus & method in relation to voltage optimization |
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| Country | Link |
|---|---|
| GB (1) | GB2480708B (en) |
| WO (1) | WO2012028839A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10725678B2 (en) | 2018-04-11 | 2020-07-28 | International Business Machines Corporation | Power management for memory subsystems |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413658A (en) * | 2013-08-09 | 2013-11-27 | 卧龙电气集团股份有限公司 | Amorphous alloy dry traction rectifier transformer allowing network side terminals to be led out from the same side |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1181262A (en) * | 1967-09-20 | 1970-02-11 | Advance Electronics Ltd | Inductive Electric Apparatus |
| US5619080A (en) * | 1995-11-02 | 1997-04-08 | Power & Ground Systems Corporation | Line filter for reducing AC harmonics |
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| US5982262A (en) * | 1994-04-20 | 1999-11-09 | Levin; Michael I. | Phase shifting transformer with low zero phase sequence impedance |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1236332A (en) * | 1969-02-12 | 1971-06-23 | Ferranti Ltd | Improvements relating to a.c. voltage-control apparatus |
| US5576942A (en) * | 1994-09-30 | 1996-11-19 | Universities Research Association, Inc. | Method and apparatus for reducing the harmonic currents in alternating-current distribution networks |
| CA2359525C (en) * | 2000-10-20 | 2005-12-27 | Delta Transformers Of Canada (1999) Ltd. | Power center unit for electronic equipment |
| US7629786B2 (en) | 2004-08-25 | 2009-12-08 | Sung Ho Lee | Device for reducing harmonics in three-phase poly-wire power lines |
| GB0418992D0 (en) * | 2004-08-26 | 2004-09-29 | Alstom | Transformers |
| NO322285B1 (en) | 2004-12-23 | 2006-09-11 | Magtech As | booster |
| WO2009038336A2 (en) * | 2007-09-18 | 2009-03-26 | Enertech Co. Ltd. | Apparatus for improving power quality |
-
2010
- 2010-09-01 GB GB201014460A patent/GB2480708B/en active Active
-
2011
- 2011-08-11 WO PCT/GB2011/001205 patent/WO2012028839A2/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1181262A (en) * | 1967-09-20 | 1970-02-11 | Advance Electronics Ltd | Inductive Electric Apparatus |
| US5982262A (en) * | 1994-04-20 | 1999-11-09 | Levin; Michael I. | Phase shifting transformer with low zero phase sequence impedance |
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| US5619080A (en) * | 1995-11-02 | 1997-04-08 | Power & Ground Systems Corporation | Line filter for reducing AC harmonics |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10725678B2 (en) | 2018-04-11 | 2020-07-28 | International Business Machines Corporation | Power management for memory subsystems |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201014460D0 (en) | 2010-10-13 |
| WO2012028839A2 (en) | 2012-03-08 |
| WO2012028839A3 (en) | 2013-02-28 |
| GB2480708B (en) | 2013-07-10 |
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