Digital multifunction relay
AssigneeABB T&D Technology Ltd.
InventorGatelli Fabio
Life of this patent
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Abstract
A digital multifunction relay, for controlling one or more protection devices of an power distribution network from fault events, which comprises a digital signal processor for executing a set of processing activities for regulating the operating state of said protection devices. The digital signal processor comprises a first computerized means for calculating the run-time computational load related to said digital signal processor and a second computerized means for reducing said run-time computational load, if said run-time computational load exceeds a predefined threshold.
Claims28
A digital multifunction relay which controls one or more protection devices of a power distribution network arranged to protect the network from a fault event, the relay comprising:
- digital signal processor means for executing a set of processing activities which regulate an operating state of said one or more protection devices of the power distribution network;
- first computerized means, connected to the digital signal processor means, for calculating a run-time computational load related to said digital signal processor means;
- and
- second computerized means, connected to the digital signal processor means and the first computerized means, for reducing said run-time computational load related to said digital signal processor means when said run-time computational load is calculated by the first computerized means as exceeding a predefined threshold,
- wherein, when the fault event is detected by the digital signal processor means, the digital multifunction relay is operated to change the operating state of said one or more protection devices.
A method of controlling one or more protection devices of a power distribution network from a network fault event using a digital multifunction relay which includes a digital signal processor, the method comprising:
- executing a set of processing activities which regulate an operating state of said one or more protection devices;
- calculating a run-time computational load related to said digital signal processor;
- reducing the run-time computational load related to said digital signal processor when said run-time computational load indicates an overload condition in the digital signal processor;
- and
- determining a presence of the network fault event and operating the digital multifunction relay to control the one or more protection devices of the power distribution network when the presence of the network fault event is determined.
Dependencies are inferred from the claim text.