  In todays modern technology and fast growth in electrical power supply, the
need for precise protection relays has become a major issue in the power
distribution system. That is, to ensure a safe operation at all levels of
generation, distribution, and consumer load, the power relay should perform at
the highest level of accuracy. Therefore, this work will investigate the
enhancement of the Overcurrent Numerical Relay in terms of the quality of
digitized incoming analog current waveform prior to numerical relay decision.
However, as it is an expensive process of testing the digitizing element of
numerical overcurrent relay, Analog to Digital Converter, this newly proposed
method of combing test automation by LabView and advanced waveform analysis
algorithms by Wavelet transform will be applied to enhance the testing process,
reduce data compiling complexity, and decrease cost. In addition, the testing
simulation will be presented using Matlab software to verify the testing
result. As a result, with a bank of filters, denoising, and decomposition
structures, Wavelet transform can provide promising results in testing and
verifying the accuracy of numerical relay digitizing process along with
automation process to increase the possibility of improving numerical relay
digitizer testing reliability with lower cost.
