Transformer inrush current detector

Details Transformer inrush current detector Transformer inrush current detector

1977-10-25

1979-11-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 58, 361 87, H02H 704

Patent

active

041752767

ABSTRACT:
To detect a d-c component of alternating current in the primary winding of an electric power transformer, a pair of current transducers are provided. Each current transducer has a saturable core adapted to be magnetized by the same current as flows in the transformer primary winding, and bias means associated with both transducers presaturate their respective cores in opposite directions by equal predetermined amounts of magnetomotive force. Secondary windings on the cores of the respective current transducers are connected to means for deriving an output signal in response to voltage induced in one but not both of the secondary windings as a result of alternating current containing a d-c component in the power transformer if such current has sufficient magnitude to unsaturate the core of one of the current transducers, a condition typifying the surge of inrush magnetizing current that flows in the transformer primary when initially energized.

REFERENCES:
patent: 2196411 (1940-04-01), Geise
patent: 3374398 (1968-03-01), Horn et al.
patent: 3731150 (1973-05-01), Weiser
IEEE Transactions on Power Apparatus and Systems, vol. PAS-94, No. 6, Nov./Dec. 1975, "A Three Phase Differential Relay for Transformer Protection" by Einvall et al., pp. 1971-1980.

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