GB766758A - Improvements in or relating to switching circuits for selecting sources of voltage - Google Patents

Improvements in or relating to switching circuits for selecting sources of voltage

Info

Publication number
GB766758A
GB766758A GB2841/55A GB284155A GB766758A GB 766758 A GB766758 A GB 766758A GB 2841/55 A GB2841/55 A GB 2841/55A GB 284155 A GB284155 A GB 284155A GB 766758 A GB766758 A GB 766758A
Authority
GB
United Kingdom
Prior art keywords
tap
resistor
switches
changing
switch
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
GB2841/55A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB766758A publication Critical patent/GB766758A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H02H7/055—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for tapped transformers or tap-changing means thereof
    • 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
    • G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

766,758. Switching systems; systems depending on the use of transformers. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Jan. 31, 1955 [Feb. 2, 1954], No. 2841/55. Class 38 (4). In a tap-changing system or a transformer or the like 12 supplying variable voltage to a load, such as airfield lamps 13, as described in Specifications 721,112 and 724,637 the tuned circuit is now replaced by a resistor 6 in the common supply lead 7 to the coils 1, 2 of the tap-changing switches 8, 9 and these switches are provided with back contacts 15, 16 connected in series across the resistor so as to short-circuit it when the switches are de-energized. Full voltage is thus available for operating either of the switches 8, 9 when its corresponding control switch 3 or 4 is closed, the voltage being reduced to a hold-in value by the resistor 6 when the tap-changing switch has operated. Closure of the control switch associated with the other tapchanging switch connects the two coils in parallel, thereby diverting current from the coil of the first switch and causing it to drop out. This reinstates the short circuit on the resistor 6, so that full voltage is now available for operating the other of the tap-changing switches which, in consequence, responds and reinserts the resistor 6. To ensure that the first tap-changing switch remains " dropped-out ", it is arranged to interrupt its coil circuit by the action of dropping out. Thus it may mechanically trip its control switch to the " off " position, or may be have normally-open auxiliary contacts arranged in a holding circuit.
GB2841/55A 1954-02-02 1955-01-31 Improvements in or relating to switching circuits for selecting sources of voltage Expired GB766758A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL331002X 1954-02-02

Publications (1)

Publication Number Publication Date
GB766758A true GB766758A (en) 1957-01-23

Family

ID=19784367

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2841/55A Expired GB766758A (en) 1954-02-02 1955-01-31 Improvements in or relating to switching circuits for selecting sources of voltage

Country Status (6)

Country Link
BE (1) BE535360A (en)
CH (1) CH331002A (en)
DE (1) DE965253C (en)
FR (1) FR1118641A (en)
GB (1) GB766758A (en)
NL (2) NL88033C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1173970B (en) * 1960-07-23 1964-07-16 Siemens Ag Circuit arrangement for activating electromagnetic switching devices using resistors sensitive to magnetic fields
DE1222573B (en) * 1962-07-27 1966-08-11 Boelkow Gmbh Circuit for locking the control circuits of any number of relays connected to the same voltage source, controllable by circuit breakers
US3398329A (en) * 1965-11-01 1968-08-20 Ite Circuit Breaker Ltd Electrical interlock means

Also Published As

Publication number Publication date
FR1118641A (en) 1956-06-08
NL184798B (en)
CH331002A (en) 1958-06-30
NL88033C (en)
DE965253C (en) 1957-06-06
BE535360A (en)

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