Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1996-06-28
1998-05-19
Leja, Ronald W.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01H 900
Patent
active
057543860
ABSTRACT:
An under voltage trip device for low and medium voltage breakers is disclosed. A first power supply receives unregulated power from a control voltage supply which is rectified and regulated with portions of the power supply monitored by a processor. The output of the first power supply is supplied to a second power supply which allows pulsing modulating power to be supplied to a solenoid connected thereto. The current supplied to the solenoid is measured and calculated by the processor and stored therein as well as being compared to stored values, thereby determining solenoid armature position and predicting or warning of solenoid failure. Connected to the second power supply is a third power supply which operates in a voltage regulator supply mode and a switcher mode during start-up and continuous running operation respectively, such mode being controlled by the processor. Switches are connected to the processor so that multiple control voltage sources may be selected and so that the delay time and pick-up or drop-out points with respect to the control voltage may be adjusted in order to determine operation of the solenoid and the position and condition of the solenoid armature and coil. The solenoid is pulsed with higher than rated voltages in order to firmly lock in the solenoid and to delay its decay during an undervoltage condition from the control voltage supply.
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Akers Stuart R.
Barbour Erskine
Leja Ronald W.
Siemens Energy and Automation, Inc.
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