Load control receiver with line under voltage and line under frequency detection and load shedding
First Claim
1. A method of responding to an under voltage event in an electrical delivery system that provides power to an electrical load, the method comprising the steps of:
- sampling a primary voltage source at regular time intervals thereby generating a series of voltage readings;
comparing the voltage readings to an under voltage trigger threshold;
detecting an under voltage condition and initializing an under voltage in-response cycle that controls the electrical load when the voltage readings are less than or equal to the under voltage trigger threshold for a predefined under voltage time period;
storing a plurality of load restore counter values in memory before disengaging the load from the primary voltage source when the voltage readings decrease to below a voltage-power fail level, wherein the voltage-power fail level is less than the under voltage trigger threshold; and
initializing a restore response after the voltage level rises above a restore value and is maintained above the restore value for an under voltage out time period.
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Accused Products
Abstract
A method for detecting line under voltage (LUV) events and initializing load shedding of loads located near the electrical disturbance without customer and utility intervention. In one example embodiment, the LUV detection system samples a primary voltage source at regular time intervals, thereby generating a series of voltage readings, and compares the voltage readings to an under voltage trigger threshold. If an under voltage condition is detected, then an under voltage in-response cycle is initialized that controls the electrical load. When the voltage readings decrease to below a voltage-power fail level, a plurality of load restore counter values are stored in memory before the load is shed from the primary voltage source. A restore response is then initialized after the voltage level rises above a restore value and is maintained above the restore value for an under voltage out-time period.
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Citations
22 Claims
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1. A method of responding to an under voltage event in an electrical delivery system that provides power to an electrical load, the method comprising the steps of:
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sampling a primary voltage source at regular time intervals thereby generating a series of voltage readings; comparing the voltage readings to an under voltage trigger threshold; detecting an under voltage condition and initializing an under voltage in-response cycle that controls the electrical load when the voltage readings are less than or equal to the under voltage trigger threshold for a predefined under voltage time period; storing a plurality of load restore counter values in memory before disengaging the load from the primary voltage source when the voltage readings decrease to below a voltage-power fail level, wherein the voltage-power fail level is less than the under voltage trigger threshold; and initializing a restore response after the voltage level rises above a restore value and is maintained above the restore value for an under voltage out time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for responding to an under voltage event in an electrical delivery system that provides power to an electrical load, the system comprising:
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means for sampling a primary voltage source at regular time intervals thereby generating a series of voltage readings; means for comparing the voltage readings to an under voltage trigger threshold; means for detecting an under voltage condition and initializing an under voltage in-response cycle that controls the electrical load when the voltage readings are less than or equal to the under voltage trigger threshold for a predefined under voltage time period; means for storing a plurality of load restore counter values in memory before disengaging the load from the primary voltage source when the voltage readings decrease to below a voltage-power fail level which is below the under voltage trigger threshold; and means for initializing a restore response after the voltage level rises above a restore value and is maintained above the restore value for an under voltage-out time period. - View Dependent Claims (10)
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11. A load control receiver with under voltage protection comprising:
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a transformer adapted to be electrically connected between a primary voltage source having a predefined voltage level and a load; a line under voltage (LUV) detection and measurement module electrically connected to the transformer and adapted to detect a line under voltage condition of the primary voltage source via the transformer; a microcontroller connected to the LUV detection and measurement module and adapted to send a command to disengage and engage an electrical load as a function of a measured voltage from the primary voltage source over a predefined period of time, wherein the measured voltage is compared to a predefined voltage threshold; and a load switch connected to the microcontroller and adapted to respond to a command from the microcontroller to disengage and engage the electrical load connected thereto from the voltage source. - View Dependent Claims (12, 13, 14, 15)
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16. A disturbance response system connected to a line voltage source comprising:
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a microcontroller; a memory arrangement connected to the microcontroller and adapted to store a plurality of under voltage threshold values and under voltage time periods; line voltage detection and measurement means connected between the micro-controller and the line voltage source for inputting a signal representative of the magnitude of the line voltage to the micro controller, and a load switch connected to the microcontroller that is adapted to respond to a command from the microcontroller to either remove a load from the line voltage source or restore the load to the line voltage source. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification