System for measuring phase currents in a 3-phase installation

Details System for measuring phase currents in a 3-phase installation System for measuring phase currents in a 3-phase installation

1989-07-18

1990-06-12

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

324117R, 324127, G01R 1900, G01R 120

Patent

active

049336304

ABSTRACT:
The invention relates to a system using Rogowski coils to measure the phase currents in a three-phase installation. Each coil (1, 2, 3) is connected firstly to a corresponding operational amplifier (10, 20, 30) connected as an integrator, and secondly to a corresponding inverter (100, 200, 300) whose output is connected to the inputs of the integrating amplifiers of the other two phases. With appropriately selected resistance values, mutual interference effects may be cancelled. The system is suitable for measuring phase currents in an installation housed in a cabinet or cubicle.

REFERENCES:
patent: 4794327 (1988-12-01), Fernandes
patent: 4795973 (1989-01-01), Smith-Vaniz et al.
Pettinga et al; "A Polyphase . . . "; IEE Proceedings; vol. 130; PT. B; No. 5; Sep. 1983, pp. 360-363.

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