Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1978-09-18
1980-08-12
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
323 60, 323 6, H02H 320, H02H 704
Patent
active
042176204
ABSTRACT:
The present invention is directed to a circuit for controlling induction in current transformers so as to maintain such induction at a level below its saturation level in presence of a primary current having an asymetric component. The control circuit comprises a detection part connected to the secondary of the current transformer for detecting an increase in the transformer induction; an auxiliary load of high resistive value at the secondary of the transformer; and a switching part governed by the detection part operative to insert the auxiliary load in series with the secondary of the transformer when the polarity of the secondary wave reaches a polarity inverse with respect to the asymetrical component of the primary current.
REFERENCES:
patent: 3510675 (1970-05-01), Johnson et al.
patent: 3875493 (1975-04-01), Kunzinger et al.
patent: 4096363 (1978-06-01), Earp
Hydro-Quebec
Salce Patrick R.
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