Relay with core conductor and current sensing

Details Relay with core conductor and current sensing Relay with core conductor and current sensing

2007-05-01

2007-05-01

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

C361S160000, C324S418000

Reexamination Certificate

active

11019880

ABSTRACT:
A relay situated in series between an AC line source and an AC load has a core conductor connected with the fixed N.O. contact, so that load current flows axially through the core of the actuator coil. Alternatively, the fixed N.C. contact may be connected with the core conductor. A plate armature with leaf springs can achieve linear axial action. A sensor connected to leads of a winding of the actuator coil picks up a an induced voltage that is representative of the current supplied to the load. This provides a simple arrangement for monitoring for current level and can be used for measuring power factor or ΔΦ at the load device. In a three phase embodiment, phase imbalance can be detected.

REFERENCES:
patent: 5701109 (1997-12-01), Poulsen
patent: 5874876 (1999-02-01), Kobayashi et al.
patent: 6320486 (2001-11-01), Dietrich et al.
patent: 6563409 (2003-05-01), Gruner

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