Assessment Analysis of Neutral to Earth Voltage (NTEV) in the Distribution System at the Government Building Using Statistical and Analytical Methods Analysis

Elevated neutral-to-earth voltage or simply known as Neutral-To-Earth Voltage (NTEV), and the related phenomenon called stray voltage is typically caused by fundamental frequency currents returning to the source via the neutral conductor and earth. The nature of grounded power systems results in the fact that the neutral conductors are not always at zero potential with respect to the earth. This study also aims to investigate the effect of Neutral to Earth voltage on power distribution. Using the appropriate measurement equipment, the data logger was attached to Main Switch Boards to record data for 4 days for monitoring, recording, and analyzing frequency, harmonics, and voltage fluctuation. In addition, the data logger for this measurement tool have been installed on the main switchboard (MSB1) in Agensi Nuklear Malaysia. This study performed a comparison of peak time (8 am-5 pm) and non-peak time (6 pm-6 am) and also the correlation between each parameter. Based on the result of standard deviation and mean, all parameters deviate very closely to the mean value. The skewness value provide evidence that the measured data was distributed close to the nominal specification. Through correlation analysis, at the end of this study it was found that the correlation between NTEV and THDV of each phase in the first location has a very high correlation.