NO142969B - Kjoeleanordning for gassturbiner. - Google Patents
Kjoeleanordning for gassturbiner. Download PDFInfo
- Publication number
- NO142969B NO142969B NO2942/70A NO294270A NO142969B NO 142969 B NO142969 B NO 142969B NO 2942/70 A NO2942/70 A NO 2942/70A NO 294270 A NO294270 A NO 294270A NO 142969 B NO142969 B NO 142969B
- Authority
- NO
- Norway
- Prior art keywords
- reactance
- currents
- phase
- phases
- transformers
- Prior art date
Links
- 238000001816 cooling Methods 0.000 title 1
- 239000012071 phase Substances 0.000 claims description 20
- 239000008385 outer phase Substances 0.000 claims description 9
- 239000013598 vector Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
- F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/601—Fluid transfer using an ejector or a jet pump
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Separation By Low-Temperature Treatments (AREA)
Description
Symmetreringsanordning for tre-fasede lysbueovner.
Ved tre-fasede lysbueovner forlegges tilførselsledningene fra transformatorens
tre faser til de tre elektroder alltid slik at ledningen til den ene elektrode ligger mellom og omtrent i samme plan som lednin-gene til de to andre elektroder. Hvis man betrakter ovnen ovenfra, kan man derfor tale om en «midtledning» og «ytre led-ninger», selv om selve elektrodene i virke-ligheten er anordnet i hjørnene av et like-sidet triangel. Analogt anvendes da ut-trykkene «midtelektrode» og «ytterelektroder». For enkelhets skyld skal disse be-tegnelser anvendes i den følgende beskri-velse.
Vanligvis forbindes hver elektrode med den ene ende av et kabelknippe, hvis annen ende er fast forankret i transformatorens skinnesystem. Transformatorfasene er som oftest delta-koblet med mange parallelle skinner pr. pol. For å ned-sette hvirvelstrømtapene i skinner og jern-bjeiker «stokkes» pluss- og minusskinnene med hinannen, slik at innenfor samme fase nærliggende skinner alltid fører strømmer av motsatt retning. Denne «stokking» kan imidlertid ikke utstrekkes lenger enn til opphengningspunktene for elektrodenes kabelknipper.
Det er et alminnelig kjent faktum at
kabelknippenes anordning i tre plan med store innbyrdes avstander fører til betyde-lige usymmetrier i de tre fasers strømmer og effekter. I henhold til patent 85 848 kan disse elimineres ved en riktig avpasset
økning av det midterste kabelknippes selv-
reaktans. Man har derfor latt det midterste knippe passere gjennom en laminert jern-krets med et passende antall luftgap.
Ved hjelp av denne anordning oppnås riktignok den nærmeste hensikt — fasenes symmetrering —, men utførelsen er for så vidt ugunstig som reaktansspolen kom-mer til å ligge i et område hvor skinne-systemet ikke lenger er «stokket». Der oppstår derfor sterke spredefelter og hvir-velstrømtap i spolen som så på sin side frembringer nye spredefelter og hvirvel-strømtap i byggets eller rommets arme-ringsjern. Der foreligger derfor et stort behov for en bedre symmetreringsmåte, hvor inngrepene i ledningssystemet gjøres innenfor de stokkede skinneføringers område, og foreliggende oppfinnelse angir en løsning av dette krav.
Oppfinnelsen angår nærmere bestemt en symmetreringsanordning for tre-fasede lysbueovner med en midtelektrode, som fører strømmen I2 og to ytterelektroder som fører strømmene I, henholdsvis I3, matet fra transformatorer i A-kobling med en midtfase som fører strømmen (I3 - I,)/3 og av to ytterfaser som fører strøm-mene ( I^- l. 2)/ 3 henholdsvis (I2-I3)/3; oppfinnelsen utmerker seg ved et reaktanselement som består av to like, bifilare viklinger som hver er seriekoblet med en av transformatorenes ytterfaser, slik at reaktanselementets resulterende ampérevin-dingstall er proporsjonalt med -(I, -I2)/3 + (I2-I.j)/3 = lg, hvor strømstyrken er angitt som vektorer.
Fig. 1 viser et koblingsskjema for an-ordningen ifølge oppfinnelsen, fig. 2 et forenklet skjema og fig. 3 et vektordia-gram for transformatorenes fasestrømmer i forhold til elektrodestrømmene.
Fra tre énfasetransformatorers sekun-dærsider S føres «stokkede» skinnestrenger 4 til A-koblingsstedet D—D, hvorfra ikke «stokkede» kabelknipper 5 fører strøm-mene I,, I2, I3 til elektrodene 6, 6P 62 og 63 i en lysbueovn. Da elektrodene kan antas å være Y-koblet, er
Transformatorenes sekundærstrømmer er ved gjennomført symmetrering
I henhold til fig. 1 kan man også for transformatorfasene innføre begrepene «ytterfaser» (1—2 hhv. 2—3) og «midtfase» (3—1).
Ifølge oppfinnelsen oppnås symmetrering ved hjelp av en reaktansspole 7 med
to like og mest mulig uten innbyrdes
spredning (altså bifilart) viklede spoler 7, og 73 magnetiseres av ytterfasenes strøm-sum
og som i hver sin strømkrets gir samme in-duktive spenningsfall
Her betyr x, hhv. x3 reaktansen av den énfasede strømkrets som på fig. 2 er dannet av midtelektroden 2 og en av ytterelektro-dene 1 eller 3 inklusive den tilhørende ytre transformatorfase med skinnestreng og kabelknipper, mens y betegner den gjensidige reaktans mellom de nevnte strøm-kretser. Det særegne ved oppfinnelsen er at reaktansen 7 nu ligger i en feltfri sone og at den lett kan utføres slik at den heller ikke selv frembringer ytre spredefelter av betydning. Reaktansspolens 7 jernkjerne er betegnet med 8.
Beviset for anordningens effektivitet kan føres som i det ovennevnte patent. Således betyr i det følgende: <E>21, E2S transformator-ytterfasenes
klemmespenning
Ej, E.,, E3 de tilhørende (ideelle) null--punktspenninger
v1 = r, = r3 = r fasenes effektive motstand ved
symmetrisk belastning.
Ved I, = (J^-flj) blir ytterfasenes spennings-ligninger:
Av ytterfasenes sym|metriske klemme-spenninger E.n og E23 utledes nullpunkt-spenningene É, og E3 ved symmetrisk belastning ved differansen Differansen (5)—(6) gir således Ved symmetrisk belastning kan denne ligning tydes som Nullpunktspenningen E, fås ved opera- I sjonen [(5)+<!>(6)]. Denne gir nemlig med h + :s] Med hensyn til (8a) kreves der imidlertid for symmetrisk belastning at
Symmetreringsbetingelsen krever således at (9) og (9a) stemmer overens, dvs. at:
hvilket skulle bevises.
Størrelsene I og E angir tidsvektorer for
strømmene og spenningene.
Claims (2)
1. Symmetreringsanordning for tre-fasede lysbueovner med en midtelektrode
som fører strømmen I2 og to ytterelektroder som fører strømmene I, og I3, matet fra transformatorer i A-kobling med en midtfase for strømmen (I3-I,)/3 og to ytterfaser for strømmene (I,-I2)/3 henholdsvis (I2-I3)/3, karakterisert v e d et reaktanselement (7) med to like, bifilare viklinger (7, henholdsvis 73) som hver er seriekoblet med en av transformatorenes ytterfaser (1—2 henholdsvis 2—3), slik at reaktanselementets resulterende ampere vindingstall blir proporsjonalt med
hvor strømstyrkene er angitt som vektorer.
2. Anordning ifølge påstand 1, karakterisert ved at hver av reaktanselementets to viklinger (7, henholdsvis 73) har (omtrentlig) reaktansen
hvor x, henholdsvis x3 angir reaktansen av den énfasede strømkrets som dannes av midtelektroden (62) og hver av ytterelek-trodene (6, henholdsvis 63) inklusive de tilhørende tilførselsledninger, men eksklu-sive reaktanselementet (7) og hvor y angir den gjensidige reaktans mellom de nevnte énfasede strømkretser.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84927269A | 1969-08-04 | 1969-08-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
NO142969B true NO142969B (no) | 1980-08-11 |
NO142969C NO142969C (no) | 1980-11-19 |
Family
ID=25305450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO2942/70A NO142969C (no) | 1969-08-04 | 1970-07-29 | Kjoeleanordning for gassturbiner. |
Country Status (6)
Country | Link |
---|---|
US (1) | US3631672A (no) |
CH (1) | CH512664A (no) |
DE (1) | DE2037816A1 (no) |
GB (1) | GB1317992A (no) |
NL (1) | NL169772C (no) |
NO (1) | NO142969C (no) |
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US2372467A (en) * | 1944-02-04 | 1945-03-27 | Gen Electric | Turbosupercharger |
US2650753A (en) * | 1947-06-11 | 1953-09-01 | Gen Electric | Turbomachine stator casing |
US2625009A (en) * | 1948-07-15 | 1953-01-13 | Curtiss Wright Corp | Vehicle engine cooling system utilizing air ejector pump to induce flow of additional cooling air |
US2840986A (en) * | 1952-04-29 | 1958-07-01 | Rolls Royce | After-burner fuel supply system for gas-turbine engines |
US2652216A (en) * | 1952-05-05 | 1953-09-15 | North American Aviation Inc | Aircraft structure cooling means |
BE535079A (no) * | 1954-01-25 | |||
US3043561A (en) * | 1958-12-29 | 1962-07-10 | Gen Electric | Turbine rotor ventilation system |
-
1969
- 1969-08-04 US US849272A patent/US3631672A/en not_active Expired - Lifetime
-
1970
- 1970-07-27 GB GB3626070A patent/GB1317992A/en not_active Expired
- 1970-07-29 NO NO2942/70A patent/NO142969C/no unknown
- 1970-07-30 CH CH1153570A patent/CH512664A/de not_active IP Right Cessation
- 1970-07-30 DE DE19702037816 patent/DE2037816A1/de not_active Ceased
- 1970-08-04 NL NLAANVRAGE7011485,A patent/NL169772C/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US3631672A (en) | 1972-01-04 |
NL169772C (nl) | 1982-08-16 |
NO142969C (no) | 1980-11-19 |
CH512664A (de) | 1971-09-15 |
NL7011485A (no) | 1971-02-08 |
DE2037816A1 (de) | 1972-02-17 |
GB1317992A (en) | 1973-05-23 |
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