Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1996-06-28
1998-03-17
Nguyen, Matthew V.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323283, 323225, 323 1, G05F 140, G05F 1652, G05F 1613
Patent
active
057291195
ABSTRACT:
An under voltage trip device for low and medium voltage breakers is disclosed. Briefly stated, a first power supply receives unregulated power from a control voltage supply, such as typically used in switchgear type substations, 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 so as to represent the solenoid armature position which is measured and calculated by a 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 with the result that multiple control voltage sources may be selected while the position and condition of the solenoid armature and coil are determined.
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Nguyen Matthew V.
Siemens Energy & Automation Inc.
Vu Bao Q.
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