GB908355A - Measuring device - Google Patents

Measuring device

Info

Publication number
GB908355A
GB908355A GB3604659A GB3604659A GB908355A GB 908355 A GB908355 A GB 908355A GB 3604659 A GB3604659 A GB 3604659A GB 3604659 A GB3604659 A GB 3604659A GB 908355 A GB908355 A GB 908355A
Authority
GB
United Kingdom
Prior art keywords
rectifier
output
alternator
frequency
circuit
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
GB3604659A
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.)
Rheinmetall Air Defence AG
Maschinenfabrik Oerlikon AG
Original Assignee
Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Maschinenfabrik Oerlikon AG
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
Priority claimed from CH6766858A external-priority patent/CH365446A/en
Application filed by Werkzeugmaschinenfabrik Oerlikon Buhrle AG, Maschinenfabrik Oerlikon AG filed Critical Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Publication of GB908355A publication Critical patent/GB908355A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

908,355. Automatic voltage control systems. MASCHINENFABRIK OERLIKON. Oct. 23, 1959 [Dec. 23, 1958], No. 36046/59. Class 38 (4). In an automatic voltage regulation system in which the excitation of an alternator is controlled in response to the output of an A.C. voltage error measuring circuit across the alternator output and of the kind disclosed in Specification 901,785, the excessive field excitation which would be called for by a large drop in alternator speed is prevented by an override circuit. The measuring circuit consists basically of a circuit (not shown) which is responsive to changes in frequency and an opposing circuit 14, 15 which is responsive to changes in both frequency and amplitude. There is additionally provided a transformer 26 and rectifier 28, the output of which is in parallel with that of rectifier 14. Under normal conditions the output of rectifier 14 exceeds that of rectifier 28, but if the frequency falls below a predetermined value, the output of rectifier 14 will fall below that of rectifier 28 and rectifier 28 takes over. The alternator output is thus allowed to fall with falling frequency. In a three-phase embodiment, Fig. 4 (not shown), the output current of a three-phase rectifier fed from two single-phase transformers provides the override.
GB3604659A 1958-12-23 1959-10-23 Measuring device Expired GB908355A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH6766858A CH365446A (en) 1958-09-12 1958-12-23 Measuring bridge

Publications (1)

Publication Number Publication Date
GB908355A true GB908355A (en) 1962-10-17

Family

ID=4528153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3604659A Expired GB908355A (en) 1958-12-23 1959-10-23 Measuring device

Country Status (1)

Country Link
GB (1) GB908355A (en)

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