CONTROLLER AND METHOD FOR CONTROLLING ELECTRICAL SUPERGRID TRANSFORMER VOLTAGE

摘要

A controller for controlling the tap positions of a group of on-load tap changing transformer (2, 2') has a respective tap position controller (14, 34, 14', 34') associated with each transformer (2, 2') each of which is arranged to be able to control its associated transformer in response to a measurement value dependent on the voltage at the transformer (2, 2'). A group sequence controller (16) is able to selectively disable the tap position controllers (14, 34, 14', 34') and output its own tap changing signals to adjust the spread of tap positions of the transformers as desired. Methods of use of such a controller are also disclosed. The invention finds primary application with the control of the high voltage supergrid transformer sections of National Power distribution systems.