Event under the auspices of the Ministry of Economy of Slovak Republic

Effect of total harmonics distortion on distance and overcurrent relays functions

Kinan Wannous
Electrical Engineering and Communication/Brno university of

Pedro Pozzobon

Petr Toman
Electrical Engineering and Communication/Brno university of technology

     Last modified: 2017-06-27

The digital Signal processing (DSP) becomes more applied and used in proactive relays. Obviously, DSP is used in wide range of application (controls, radio, communications and other devices).A conventional relay is used mathematics algorithm to calculate the current and voltage input signal and evaluate the fault current and voltage, total harmonic distortion (THD) and harmonic components. The test concept has built based on relay functions and the effect of harmonics on relay algorithm. Practical part has included injection number of harmonics to relay and show the effect of them and how the relay mathematics can understand the harmonics.The evaluation of current RMS showed that the measured current is less than the injection current as well due to these parameters, the relay will not work correctly can be caused by the harmonic distortion.


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