GB1303634A - - Google Patents

Info

Publication number
GB1303634A
GB1303634A GB2181069A GB1303634DA GB1303634A GB 1303634 A GB1303634 A GB 1303634A GB 2181069 A GB2181069 A GB 2181069A GB 1303634D A GB1303634D A GB 1303634DA GB 1303634 A GB1303634 A GB 1303634A
Authority
GB
United Kingdom
Prior art keywords
primary
turns
phase
current
reactor
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
Application number
GB2181069A
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 filed Critical
Publication of GB1303634A publication Critical patent/GB1303634A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic 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
    • G05F1/10Regulating voltage or current
    • G05F1/12Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/32Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices
    • G05F1/33Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices with plural windings through which current to be controlled is conducted
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20Charging or discharging characterised by the power electronics converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Ac-Ac Conversion (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

1303634 Automatic voltage regulation and control GENERAL ELECTRIC CO Ltd 29 April 1970 [29 April 1969] 21810/69 Headings G3R and G3X The voltage of a three phase network is stabilized by an arrangement comprising a primary A.C. saturated reactor having a plurality of core limbs carrying primary windings connected in shunt with the network and wound in series zigzag form as for the primary windings of a magnetic frequency multiplier, wherein suppression of harmonics is provided by secondary turns on the limbs arranged and inter-connected so as to form a closed polyphase mesh as for a short-circuited output winding of the comparable frequency mulitplier, the total phase number being any multiple of three and the mesh sequence of the secondary turns being so arranged as to provide points at which a symmetrical three-phase output voltage of treble frequency is available and to which there is connected a three-phase treble frequency secondary reactor. In Fig.1 the series zig-zag primary windings No are connected in star to the network 1, 2, 3 and effectively form three groups as described in Specification 1123582. The secondary turns N 3 form a mesh closed with respect to the ninth harmonic to represent a short circuit for all such harmonic fluxes in the nine limbs of the reactor core PR. Tapping points Q, R, T provide a symmetrical output voltage V 3 and are connected to the primary winding N 3 , of a secondary three-phase saturated reactor SR having short circuited secondary mesh turns N 9 . Winding N 3 , 3 carries a third harmonic current I 3, 3 and the turns N 9 carry a current I 9 to ensure short circuiting of the ninth harmonic on the reactor SR and to counteract the tendency of the mesh N3 to over-compensate the seventeenth and nineteenth harmonics, the latter function ensuring that the currents in the windings No and the network are nearly sinusoidal. Point P may be connected to a neutral point N, isolated or earthed if turns ratio N 3 /No is suitably selected. In a modification to the reactor SR, Fig.2, (not shown), six wound limbs carry a three-phase starconnected primary winding connected to the points Q, R, T and the short circuited mesh turns are connected to a D.C. supply which is variable to provide a desired relationship between the primary voltage and current and so give an additional degree of voltage stabilization. In the embodiment of Fig.3 the primary windings are inter-connected to ensure that adjacent ones of the limbs linked by flux paths carry fluxes whose mutual phase displacement is 120‹ electrical of the three phase network R, Y, B to be stabilized. Unwound limbs UL alow for reduction of the cross-section of the iron core. The winding N 3 , 3 of the reactor SR may be controlled by a tap changer TC in response to network voltage variations to provide the additional degree of voltage stabilization. The core arrangement of the primary reactor of Figs.1 and 3 may be sub-divided into a number of separate sections each with its magnetic circuit continuity maintained by the addition of an unwound limb at the point of separation but with inter-connected turns as required for the number of limbs used. Each section may be housed in a separate oil-filled tank. Other modifications include the connection of network terminals 1, 2, 3 to the respective turns on the three middle limbs of the core and the achievement of the Œ 20‹ phase displacement between the zig-zag groups either with an equal internal connection and external reversal of the phase sequence (as in Fig.1) or with the same phase sequence on both groups if the internal zig-zag connection is reversed. The embodiments of Fig.3 and Fig.2, (not shown), may be used in conjunction with series capacitors as described in Specifications 1123582 and 1288741, although such capacitors can be dispensed with by gradual control of the transition between open circuit and short circuit conditions of the treble frequency circuit. Fig.4 illustrates such an arrangement and uses as the secondary reactor a transductor T.D. having three-phase windings and two control windings CW1, CW2 with an equal number of turns. Winding CW1 has an excitation I 3 a derived through members CT, RI from the primary current I 1 and proportional thereto with the factor of proportionality chosen so that without any correcting influence the compensating current I 3 would be greater than the ideal current I 30 giving optimum wave shape and a characteristic Vc between the open and short circuit voltage characteristics V I0 and V IS shown in Fig.6. Thus by appropriate control of I 3 a characteristic which is constant over a wide range of primary current I 1 will be obtainable. To this end the control winding CW2 carries a biassing current I 3 b opposed to I 3 a and obtained from the secondary voltage V 3 of the primary reactor PR through members VT, R2, or alternatively from the primary voltage V 1 . To prevent premature decay of the characteristic Vc at low values of I 1 (see dotted line in Fig.6), caused by I 3 a approaching zero with I 3 b remaining constant, a gate rectifier GR is arranged to carry current only in the direction of the current I 3 a so that if the latter is greater than I 3 b both currents can flow independently, but if I 3 a tends to become less than I 3 b any difference between the currents is prevented and the ampere-turns will be forced down to zero below this critical current, Fig.5, (not shown).
GB2181069A 1969-04-29 1969-04-29 Expired GB1303634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2181069 1969-04-29

Publications (1)

Publication Number Publication Date
GB1303634A true GB1303634A (en) 1973-01-17

Family

ID=10169202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2181069A Expired GB1303634A (en) 1969-04-29 1969-04-29

Country Status (6)

Country Link
JP (1) JPS5115216B1 (en)
AT (1) AT302491B (en)
CH (1) CH500611A (en)
DE (1) DE2020264A1 (en)
GB (1) GB1303634A (en)
SE (1) SE362549B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112403A (en) * 1975-11-25 1978-09-05 Associated Electrical Industries Limited Saturated reactor arrangements

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52123322U (en) * 1976-03-16 1977-09-20
JPS52126421U (en) * 1976-03-24 1977-09-26
JPS5529750U (en) * 1978-08-18 1980-02-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112403A (en) * 1975-11-25 1978-09-05 Associated Electrical Industries Limited Saturated reactor arrangements

Also Published As

Publication number Publication date
CH500611A (en) 1970-12-15
JPS5115216B1 (en) 1976-05-15
AT302491B (en) 1972-10-10
DE2020264A1 (en) 1971-01-07
SE362549B (en) 1973-12-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee