Abstract:
Apparatus and methods for selective protection of an electrical load from disturbances on an input power line. A power protection circuit includes a selectively variable inrush current limiting circuit and a switch for disconnecting the input power line from the load. A control circuit determines that the electrical load is in a first operational state, such as a standby mode or normal operation, or a second operational state, such as full operation at rated current. The power protection circuit provides variable inrush current limiting to the electrical load in response to a first category of disturbances when the electrical load is in the first operational state. The power protection circuit inhibits disconnecting the electrical load in response to a second category of disturbances when the electrical load is in the second operational state. Species of selectively variable current limiting circuits are also described.
Abstract:
System and methods for transferring time-stamped event data and correcting the relative time associated with the time-stamped event to the correct “absolute” time, wherein “absolute” time is an official reference time. A time stamp relative to a predetermined event is obtained from a real time clock (RTC) that is unsynchronized to absolute time and associated with event data, as may be acquired by a data monitoring component. The relative time of the event data is correlated with “absolute” time to find a correction factor or time offset that defines the variation between the relative time and the absolute time. The time offset is applied to some or all of a plurality of event data sets transferred to other components in a utilization system to provide time corrected event data sets.
Abstract:
Apparatus and methods for selective protection of an electrical load from disturbances on an input power line. A power protection circuit includes a selectively variable inrush current limiting circuit and a switch for disconnecting the input power line from the load. A control circuit determines that the electrical load is in a first operational state, such as a standby mode or normal operation, or a second operational state, such as full operation at rated current. The power protection circuit provides variable inrush current limiting to the electrical load in response to a first category of disturbances when the electrical load is in the first operational state. The power protection circuit inhibits disconnecting the electrical load in response to a second category of disturbances when the electrical load is in the second operational state. Species of selectively variable current limiting circuits are also described.