US1699153A - System of distribution - Google Patents

System of distribution Download PDF

Info

Publication number
US1699153A
US1699153A US662205A US66220523A US1699153A US 1699153 A US1699153 A US 1699153A US 662205 A US662205 A US 662205A US 66220523 A US66220523 A US 66220523A US 1699153 A US1699153 A US 1699153A
Authority
US
United States
Prior art keywords
current
windings
valves
circuits
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US662205A
Other languages
English (en)
Inventor
Albert H Mittag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US662205A priority Critical patent/US1699153A/en
Priority to FR29412D priority patent/FR29412E/fr
Application granted granted Critical
Publication of US1699153A publication Critical patent/US1699153A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/51—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using discharge tubes only

Definitions

  • My present invention relates to systems of electrical distribution, and more particularly to systems'for supplying current from a direct current distribution system for the operation of alternating current consumption apparatus.
  • One of the objects of my invention is to provide a simple, reliable and efficient apparatus for converting direct current into alternating current, which will not require for its operation any devices having moving parts.
  • a further object of my invention is to provide an apparatus for the purpose mentioned, which will be especially adapted for use in .connection with high voltage direct current distribution systems.
  • I provide a plurality of transformer windings and supply current from the direct current source to the primary windings through a plurality of electron discharge valves;
  • these valves should operate the best efiiciency they should be controlled in such a way that current will flow only when the potential difference between the terminals is comparatively small, and substantially the maximum current carried by the valves should be permitted to flow therethrough during the entire period during which the valve is rendered conducting.
  • the current wave flowing through the valves must depart materially from the 'sine wave becoming substantially rectangular. This will result in production in the secondary windings of the transformer of waves having pronounced harmonics, which in some cases may be objectionable.
  • Still another object of my invention is to provide anapparatus whereby the obj cationable harmonics in the secondary current, particularly the fifth and seventh will be largely eliminated.
  • I have indicated in Fig. l a plurality of electron discharge valves 1 to 12, inclusive for supplying current from the direct current distribution mains 13, 14; to the primary windings 15 to 26, inclusive, of twogthreephase transformers 27 and 28.
  • the primaries of each transformer are connected in double Y with interphase transformers 29 and 30 between the two neutrals for maintaining the proper balance between the currents supplied to the two primaries.
  • the secondary windings 31 and 32 of the transformers 27 and 28 are connected in extended delta in such a way that the primary terminal voltages of one transformer may be displaced by 30 from the primary terminal voltages of the other and the secondary voltages may be in phase for reasons which will be more fully explained later.
  • Valves 1 to 12 are indicated as'being of the three-electrode type having the usual cathode 39, anode 40 and discharge controlling grid 41. These may be of the high vacuum thermionic type or may operate by gas ionization.
  • valves In order to secure the desired efficiency in operation these valves should be made conucting during approximately one-third of each cycle.
  • the positive potential applied to the grids to render the valves conducting should also be impressed in such a way that the current through each valve may quickly build up to its maximum value.
  • the valve In order that commutation may be effected without setting up surges in the system the valve should also be rendered non-conducting at the instant when the current has fallen to zero, or substantially to zero.
  • substantially rectangular potential waves should beapplied to the grids of ,the valves if the valves are of the thermionic type. If the valves are of the ionization type all that is necessary is to supply to the grids a positive potential of short duration to permit the current tov start.
  • valves 42 to 53 inclusive may be employed.
  • the anodes of these valves are connected to the positive side of the direct current supply by means of the lead 54 through individual resistances 55.
  • Controlling potentials of the grids of valves 42 to 53 are obtained from the alternating current distribution mains through the conductors 56, 57 and 58 which are connected to e uidistant points in the rmg winding 59, and y suitable adglustment of these ta s potentials of the desired phase may .be obtamed.
  • the grid circuits of valves 42 to53 ma be completed through a winding 61, the middle point 62 of which is connected to the cathodes of the valves through the grid biasing battery 63.
  • valves 42 to 53 are connected throu h condensers 64 to the primaries of transformers 65, the secondaries of which are connected in the grid circuits of valves 1 to 12.
  • the valves 42'to 53 are non-conducting their anodes will be at substantially the same potential as the positive side of the direct current supply.
  • the charging current of condenser 64 will then induce in the secondaries of transformers 65 a current which will make the grids 41 negativeand prevent the flow of current through valves 1 to 12.
  • valves 42 to 53 have been rendered conducting their impedance is greatly reduced and the main drop in their plate circuit-s occurs through resistances 55.
  • the duration of the positive potential wave applied to the grids of valves 1 to 12 may be made equal to the time during which it is desired to have current flow in valves 1 to 12.
  • the taps 60 By suitable adjustment of the taps 60 the instants when the potentials applied to the grids of valves 1 to '12 change from negative to positive, may be made to correspond to the instants when it is desired that the currents should begin to flow in valves 1 to 12.
  • Any convenient form of frequency determining element may be connected to the alternating current distribution system for fixing the frequency of the alternating currents produced.
  • a rotary converter 66 is connected to the alternating currenfldistribution system and the speed at which the converter is operated may deter mine the frequency of the alternating currents produced.
  • This converter may be used to charge a storage battery 67 for supplying low voltage direct current for any desired purpose; as for example, for heating the cathode of valves 42 to 53.
  • the operation of the system described may be initiated by starting the rotary converter 66 from the storage battery 67.
  • the phase relations between the fundamental voltages and the seventh harmonics thereof set up in the different primary windings is indicated in Fig. 2.
  • the curves A in this figure represent the voltages produced in the primary windings of one of the transformers and the curves B represent the voltages produced in the primary windings of the other transformer. It will be noted that the fundamental voltages of curve B lag behind those of curve A by 30. At any instant, however, such as that indicated by the vertical line C, D, the seventh harmonic of each phase indicated in curve B lags 210 behind the corresponding harmonic of curve A.
  • The'combination a system of electrical distribution of a 'sourceiof direct l current, two sets of three-phaseprimary transformer windingsconnected .to said'i r source through a'plurality of valves, a 'three-phasetsecondary transformer winding associated with each set of primary windings said secondary windings being'connected to a three-phasedistribution circuit and means ffor supplying to oil's-set ofprimary windings currents which are displaced in phase from; those supplied to the corresponding windings of the other set, the two secondary windings being so related to the prim v mary-windings that the currents suppliedthereto by the two sets of primarywindings willbeinphase.
  • the combination of directand alternating current circuits, agroup ,ofprnnaryf 'windin gs means comprising a plurality oflelectrical yalves connected between said group and said direct. current circuit'l for; causing current impulses of. substantially rectangular wave form to be i successiyely supplied to said windings, and'a group of, secondary windings arrangedtoisupply tov said 'altieriating current circuit polyphase "currents from which the fifth and seventh'harmonics have been'eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
US662205A 1923-09-12 1923-09-12 System of distribution Expired - Lifetime US1699153A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US662205A US1699153A (en) 1923-09-12 1923-09-12 System of distribution
FR29412D FR29412E (fr) 1923-09-12 1924-09-09 Système de distribution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US662205A US1699153A (en) 1923-09-12 1923-09-12 System of distribution

Publications (1)

Publication Number Publication Date
US1699153A true US1699153A (en) 1929-01-15

Family

ID=24656795

Family Applications (1)

Application Number Title Priority Date Filing Date
US662205A Expired - Lifetime US1699153A (en) 1923-09-12 1923-09-12 System of distribution

Country Status (2)

Country Link
US (1) US1699153A (fr)
FR (1) FR29412E (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579374A (en) * 1947-03-15 1951-12-18 Gen Railway Signal Co Power conversion device of the vacuum tube type
US2733400A (en) * 1956-01-31 hagensick
US2832907A (en) * 1955-12-23 1958-04-29 Jack & Heintz Inc Dynamo-electric machine
US3210635A (en) * 1961-04-17 1965-10-05 Westinghouse Electric Corp Transformer-rectifier circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733400A (en) * 1956-01-31 hagensick
US2579374A (en) * 1947-03-15 1951-12-18 Gen Railway Signal Co Power conversion device of the vacuum tube type
US2832907A (en) * 1955-12-23 1958-04-29 Jack & Heintz Inc Dynamo-electric machine
US3210635A (en) * 1961-04-17 1965-10-05 Westinghouse Electric Corp Transformer-rectifier circuit

Also Published As

Publication number Publication date
FR29412E (fr) 1925-07-27

Similar Documents

Publication Publication Date Title
US1699153A (en) System of distribution
US2239437A (en) Electric valve converting apparatus
US1937369A (en) Electric valve circuit
US2179366A (en) Electric valve converting system
US1835131A (en) System of distribution
US1874777A (en) Electric power control apparatus
US2246181A (en) Electric valve control circuit
US2017708A (en) Polyphase oscillator
US2119130A (en) Electric valve control system
US2333593A (en) Power translating device
US2162519A (en) Electric discharge apparatus
US1967896A (en) Electric valve converting apparatus
US2039034A (en) Electric conversion system
US2169031A (en) Electric discharge apparatus
US1800002A (en) System of distribution
US1967876A (en) Electric valve converting apparatus
US2267398A (en) Electric valve control circuits
US1935227A (en) Frequency changing system
US1902460A (en) Electric translating circuits
US1929726A (en) Electric valve converting apparatus
US1893784A (en) Voltage regulating system
US2063648A (en) Electric valve rectifying system
US2114856A (en) Electric valve converting system
US1929721A (en) Electric valve converting apparatus
US1870027A (en) Electric power converting apparatus