Eko Electricity Distribution Company (EKEDC) 500 kVA distribution transformer THD measurements

Published: 3 October 2023| Version 1 | DOI: 10.17632/p6fpbk4bhm.1
, Bilkisu Jimada-Ojuolape


Eko Electricity Distribution Company (EKEDC) serves as a prominent electricity provider for residential, commercial, and industrial customers across Nigeria. Beyond delivering electricity, EKEDC offers an array of essential services, including fault tracking, bill history access, maintenance, new equipment installation, and various value-added offerings. This study focuses on two EKEDC distribution transformers, each having a 500 kVA capacity, a voltage ratio of 33/0.415 kV, and an 80% load capacity. The investigation into total harmonic distortion (THD) within these transformers employed the Fluke 435 experiment. Within the dataset, five tables (Tables 1–5) present key metrics: voltage harmonics, current harmonics, phase-neutral voltage, phase-phase voltage, and current per phase. Over the course of a 60-minute (one-hour) duration, the THD voltage exhibited consistent fluctuations, ranging from 0.63 V to 1.04 V across all three phases. Concurrently, the THD voltage from the neutral to ground displayed a range of 59.48 V to 70.61 V. For THD current, minute-by-minute measurements during the same one-hour duration revealed distinct ranges for each of the three phases and the neutral line. Specifically, these ranges encompassed 12.82 A to 16.68 A for line L1, 5.3 A to 6.31 A for line L2, 8.53 A to 10.05 A for line L3, and 12.89 A to 16.76 A for neutral line N, respectively.



Kwara State University


Power Transformer, Harmonics in Power System, Power Quality