Current level control for TWACS inbound communications
First Claim
1. A method of controlling the current level of an inbound signal used in a TWACS for an electrical distribution system, the inbound signal conveying operational information and data on the performance of the system to the TWACS comprising:
- measuring the current of the inbound signal;
performing the current measurement for each of a predetermined number of successive inbound signals;
determining the root mean square (RMS) value of the measured current values;
controlling the operation of a solid state device used to generate the inbound signal as a function of the root mean square value; and
modulating a line current propagating through the electrical distribution system with the inbound signal occurring at a predetermined range of angles within a line voltage cycle regardless of variations in the line voltage characteristics for said inbound signal to be readily detected.
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Accused Products
Abstract
A method of controlling the current level of an inbound signal (Si) used in a TWACS (two-way communication system) for an electrical distribution system. The inbound signal conveys operational information and data on the performance of the system. The method includes first measuring the current (I) of the inbound signal. This current measurement is performed for each of a predetermined number of successive inbound signals. The root mean square (RMS) value of the measured currents is then determined. Operation of a solid state device (SCR) used to generate the inbound signal is now controlled as a function of the root mean square value. A line current propagating through the electrical distribution system is now modulated with the inbound signal. The inbound signal occurs at a predetermined range of angles (X) within a line voltage cycle regardless of variations in the line voltage characteristics. This enables the inbound signal to be readily detected.
72 Citations
11 Claims
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1. A method of controlling the current level of an inbound signal used in a TWACS for an electrical distribution system, the inbound signal conveying operational information and data on the performance of the system to the TWACS comprising:
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measuring the current of the inbound signal; performing the current measurement for each of a predetermined number of successive inbound signals; determining the root mean square (RMS) value of the measured current values; controlling the operation of a solid state device used to generate the inbound signal as a function of the root mean square value; and modulating a line current propagating through the electrical distribution system with the inbound signal occurring at a predetermined range of angles within a line voltage cycle regardless of variations in the line voltage characteristics for said inbound signal to be readily detected. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a TWACS used with an energy distribution system, system information data being conveyed using an inbound signal imposed upon a current waveform propagating through the distribution system, apparatus for controlling generation of the inbound signal for the inbound signal to occur at a predetermined point within the voltage waveform, comprising:
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means measuring the current for each of a predetermined number of successive inbound signals; means determining a root mean square (RMS) value for the measured currents; and
,means controlling operation of a solid state device used to generate inbound signals as a function of the root mean square value thereby to control the generation of said inbound signals so said signals occur at a predetermined angle within a line voltage cycle regardless of variations in the line voltage characteristics whereby said inbound signals are readily detected. - View Dependent Claims (8, 9, 10, 11)
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Specification