Relay device and corresponding method

A relay device having a normal mode and a relay under test mode, comprising:

• at least one mode change device for changing the relay device from a normal mode to a test mode;
• an interface for receiving test script from a source;
• a logic device for providing a logic output;
• a waveform generator for receiving the logic output when the relay device is in test mode, wherein the waveform generator is configured to set test mode fault values, the waveform generator being further configured to receive test script from the interface and output test data results;
• a data preparation component for receiving power system input data, the power system input data comprising a current sample and a voltage sample and the data preparation component configured for preparing the power system input data for processing;
• a data processor for performing phasor estimation and frequency tracking of the test mode fault values and the power system input data and the data processor performing protection calculations on the test mode fault values and the power system input data;
• and
• an output connected to the data processor to receive results of the protection calculations for the power system input data when the relay device is in the normal mode.