Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1988-10-17
1990-03-27
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324127, G01R 3302, G01R 1900
Patent
active
049123963
ABSTRACT:
Circuit for detection of an asymmetry in the magnetization current, generated by a reference alternating voltage, in a magnetic modulator, in particular a magnetic modulator for zero-flux detection. This magnetic modulator comprises two virtually identical, wound magnet cores (T2, T3), each with a primary winding (W1) to be fed with a modulating current (i.sub.1) and a series circuit of an auxiliary winding (W3) and an impedance (Z2, Z3) across which a voltage proportional to the magnetization current arises during operation. The reference alternating voltage (U.sub.m) is fed to the respective series circuits (W3, Z2; W3, Z3) such that no resultant induction current is induced in the modulating current (i.sub.1). The voltages over the impedances (Z2, Z3) form input signals for two peak value detectors (PD1, PD2), the strength of the output signal of which represents the degree of asymmetry of magnetization current. For processing the output signals of the two peak value detectors (PD1, PD2), devices (D) are provided which produce a virtually ripple-free output signal in the case of a symmetrical magnetization current. The invention also relates to a measurement circuit for the accurate measurement of direct and alternating currents.
REFERENCES:
patent: 4147972 (1979-03-01), Hochstetter
patent: 4255705 (1981-03-01), Milkovic
J. Lisser and A. J. van de Water; "Zero-Flux Current Transformer For Wide-Band Precision Measurement In AC and DC HV Systems"; IEE Fourth International Conference on AC and DC HV Power Transmission; London 23-26; Sep. 1985; pp. 229-234.
J. Lisser et al.; "Nullfluss-Stromwandler zur Messung von Gleich und Wechselstromen" ("Zero Flux Current Convertor for Measurement of Direct and Alternating Currents"); Elektrotechnische Zeitschrift 100; No. 24; 1979; pp. 1390-1394.
Holec Systemen en Componenten B. V.
Karlsen Ernest F.
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