QUALITY ANALYSIS OF HIGH-VOLTAGE NETWORK IN NIAMEY CITY

The high-voltage distribution network in the city of Niamey has a tree structure, with some branches looped together, but it is operated radially. The river area, which includes the regions of Dosso, Niamey, and Tillabery, is mainly supplied by the 132 kV interconnection line from Berni Kebbi in Nigeria, covering around one-third of demand, with the remainder being met by local production. The high-voltage distribution network in the city of Niamey has 42 branches with a total length of 212,238 km, 94.3% of which are overhead and 5.7% underground. This network is used to supply HV/LV transformer stations to customers, numbering 288,924, 319,326, and 329,557 in 2022, 2023, and 2024, respectively, all power levels combined. Analysis of the high-voltage network in the city of Niamey shows that it fails 100% after only 240 hours of service, so its availability beyond that cannot be relied upon. Nevertheless, the study showed that the high-voltage/low-voltage transformer stations visited are not polluted by harmonics beyond the standard. Nevertheless, it is up to the distribution company to monitor harmonic rates in view of developments that introduce more static converters and other sources of pollution.