Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-04-01
1982-04-06
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
315130, 324111, 340652, G01R 3102, G08B 2100
Patent
active
043238416
ABSTRACT:
An indicating device for use in a plant for supplying electric current from an alternating current source to a loop circuit having a plurality of serially interconnected primary circuits of a number n of current transformers coupled to an airfield lighting lamp, comprises a transformer coupled to the alternating current source to generate a voltage signal representative of the voltage supplied to the loop circuit, a transformer coupled to the loop circuit to generate a current signal representative of the current flowing in the loop circuit, and an electronic circuit capable of generating in response to the voltage and current signals an output voltage indicative of the number of primary circuits of the loading transformers being uncoupled to their respective secondary circuits. The output voltage is proportional to the voltage integral. ##EQU1## of the loop supply voltage u from the time t.sub.o when the loop current i in each half period passes the zero value and to the time T when the loop current i attains a value corresponding to the saturation current i.sub.M for the current transformers. Preferably, a compensation voltage representative of the value of the voltage integral in case none of the current transformers has an unloaded secondary circuit is subtracted from the output voltage so as to obtain a final voltage signal which can be passed on to a meter precalibrated to indicate the number of uncoupled secondary units.
REFERENCES:
patent: 3054991 (1962-09-01), Howell
patent: 3061828 (1962-10-01), Hauck
Albertus Christian Gundorph
Giortz Leif Heegaard
Hansen Erik Steinmann
Karlsen Ernest F.
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