• Conduct a comprehensive measurement campaign on the electrical networks of both schools.
• Identify transient and permanent phenomena that could cause damage.
• Assess compliance with current standards (voltage, frequency, harmonics).
• Formulate corrective recommendations to ensure the reliability of the installations.

Two power analyzers were installed: a Hioki PW3198 at Niska School and a Dranetz HDPQ-P-GAFLEX6KPKG at Mikisiw School. Measurements were taken over a two-week period. The parameters monitored included: effective voltages, imbalances, harmonics up to the 50th order, total harmonic distortion, and transient events.

• In steady state, voltages and currents remained within the guideline values. No prolonged overvoltage or interruption events were recorded.
• A critical transient event was detected: multiple voltage drops accompanied by significant frequency variations. These disturbances may have damaged the starter relay coils.
• Analysis of a relay provided revealed a burnt-out coil, confirming abnormal electrical stress.

• Ask Hydro-Québec to investigate the cause of the voltage drops observed.
• Install soft-start devices for large motors in the community.
• Upgrade lightning protection with surge arresters that comply with current standards.
• Implement continuous monitoring of power quality to quickly detect and correct anomalies.

Thanks to these measures, the CEPN will be able to:

• Reduce recurring starter failures.
• Protect sensitive equipment from electrical disturbances.
• Improve the reliability of school facilities and ensure the continuity of educational services.

This study demonstrates the importance of measuring and diagnosing power quality to prevent costly failures. 3E Eng.‘s expertise made it possible to identify the probable causes of the breakdowns and propose concrete solutions to secure the Obedjiwan school network.