US 5,450,002 A · Co-controller for controlling an LTC transformer with a standard voltage regulator control

Abstract

A co-controller provides communication between a standard voltage regulator controller and an LTC transformer, to enable the standard controller to be used in the operation of the LTC transformer. The co-controller generally consists of an interface circuit and a control circuit. The interface circuit receives status signals pertaining to the operation of an LTC transformer, as well as control signals from a voltage regulator controller, and buffers these signals for presentation to the control circuit. The control circuit is microprocessor based, and modifies the input signals from the interface circuit to provide the appropriate control signals required for the operation of the LTC transformer. The control circuit also implements a number of functions not available through a standard controller, such as current balance paralleling, overvoltage protection and correction for faults.

Claims14

Dependent claims

A device for controlling the operation of a load tap changing transformer in accordance with control signals generated by a voltage regulator controller, comprising:

an interface circuit for receiving status signals pertaining to the operation of the load top changing transformer and control signals from a voltage regulator controller, and for buffering said status and control signals;
and
a control circuit for receiving said buffered status and control signals and managing the timing and sequencing of a tap changing operation, including
means responsive to a control signal requesting a tap change for storing the direction and location of the requested change;
means for determining whether the requested change will be allowed to take place;
signal generating means responsive to said determining means for providing a signal to said interface circuit to initiate a change in the requested direction;
means responsive to said status signals for aborting a change and returning the load tap changing transformer to a prior state in response to predetermined conditions;
and
means for providing signals to said interface circuit to complete the requested change in the absence of said predetermined conditions.

6 more elements

Dependencies are inferred from the claim text.

Co-controller for controlling an LTC transformer with a standard voltage regulator control

Life of this patent

Co-controller for controlling an LTC transformer with a standard voltage regulator control

Life of this patent

Abstract

Claims14