Importance

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Abstract

A circuit for automatically introducing a component of negative resistance line drop compensation into the control circuitry of a conventional voltage regulator to reduce the regulated voltage level on and, consequently, the load current level in a single phase primary electric distribution circuit during periods of peak load. The subject circuit automatically removes the negative resistance component from the regulator control circuitry during off-peak periods when the energy demand or loading on the distribution circuit is relatively low. A current transmitter is connected to a current transformer of the regulator to sense when the distribution circuit load current increases to a first predetermined level at or near peak load levels whereupon the transmitter actuates switching circuitry to introduce the negative resistance component into the regulator control circuitry after which the transmitter deactivates the switching circuitry to remove the component from the regulator control circuitry when the distribution system load current decreases to a second predetermined level below the first level. A switching circuit for demand reduction on a three phase electric distribution circuit is also disclosed.

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First Claim