Utility monitor for detecting and storing power line disturbances
First Claim
1. A utility monitor for detecting and storing power line disturbances comprising:
- transformer means for coupling a sinewave voltage from the power lines;
a timing means generator connected to said transformer means for generating zero crossover pulses and strobe pulses for timing and sampling the input sinewave voltage, respectively;
a first and second pair of comparators coupled to said transformer means for sensing an over-voltage and an under-voltage, respectively;
a first and second reference voltage connected to an input of each comparator of said first and second pair of comparators respectively;
a voltage divider located in each input line connected to the other input of each comparator of said first and second pair of comparators for modifying said input sinewave voltage to a difference voltage for each of said other inputs of said comparators of said first and second pair of comparators;
said first pair of comparators providing a set and reset output when the modified input sinewave voltage exceeds and drops below said reference voltage respectively;
said second pair of comparators providing a set and reset output when the modified input sinewave voltage drops below and exceeds said reference voltage respectively, the set and reset output from each pair of comparators being separated at least by the difference in voltage provided by said voltage divider and obtaining an interrupt signal at the time of said strobe pulse indicative of an input voltage rise above or below respective threshold values;
and means for storing a preselected number of cyclic variations of said input sinewave voltage before and after said interrupt output.
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Abstract
A utility monitor for detecting and storing power line disturbances is provided which includes peak-voltage sensing means for over-voltages which provides an interrupt signal at the time of a strobe pulse indicative of a voltage rise above a preset threshold and which removes the interrupt signal when said peak voltage drops a preselected amount below the preset threshold value. A peak-voltage sensing means for under-voltages is also included for obtaining an interrupt output at the time of said strobe pulse indicative of a voltage drop below a preset threshold and for removing the interrupt output when said peak-voltage rises a preset amount above the preselected threshold value. A preselected number of cycles of said input sinewave voltage are stored before and after said interrupt.
74 Citations
8 Claims
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1. A utility monitor for detecting and storing power line disturbances comprising:
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transformer means for coupling a sinewave voltage from the power lines; a timing means generator connected to said transformer means for generating zero crossover pulses and strobe pulses for timing and sampling the input sinewave voltage, respectively; a first and second pair of comparators coupled to said transformer means for sensing an over-voltage and an under-voltage, respectively; a first and second reference voltage connected to an input of each comparator of said first and second pair of comparators respectively; a voltage divider located in each input line connected to the other input of each comparator of said first and second pair of comparators for modifying said input sinewave voltage to a difference voltage for each of said other inputs of said comparators of said first and second pair of comparators; said first pair of comparators providing a set and reset output when the modified input sinewave voltage exceeds and drops below said reference voltage respectively; said second pair of comparators providing a set and reset output when the modified input sinewave voltage drops below and exceeds said reference voltage respectively, the set and reset output from each pair of comparators being separated at least by the difference in voltage provided by said voltage divider and obtaining an interrupt signal at the time of said strobe pulse indicative of an input voltage rise above or below respective threshold values; and means for storing a preselected number of cyclic variations of said input sinewave voltage before and after said interrupt output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification