Harmonic currents are generated by loads known as “distorting” loads: variable speed drives, electronic starters, capacitor banks, power electronics systems, etc. These phenomena can lead to:

• a deterioration in the quality of the electrical waveform;
• overheating of transformers and cables;
• premature aging of protections and motors;
• risks of non-compliance with Hydro-Québec’s C.25-01 standard.

Without a proper study, your connection projects may be delayed or rejected by Hydro-Québec.

We follow a rigorous approach tailored to each site:

• Data collection: inventory of disruptive loads, single-line diagrams, equipment characteristics, and network data provided by Hydro-Québec.
• On-site measurements: installation of power quality analyzers (Hioki PQ3198 analyzer) to record currents and voltages over several days.
• Modeling and simulations: use of specialized software (EasyPower, EMTP) to calculate harmonic emissions according to load scenarios.
• Comparison with C.25-01 standard: validation of results at the common connection point (CCP), in accordance with Hydro-Québec limits.
• Full report: clear conclusions and corrective recommendations (e.g., harmonic filters, load optimization, motor sequencing).

We have assisted several clients in the Quebec City, Chaudière-Appalaches, Montérégie, and Saguenay–Lac-Saint-Jean regions:

• Industrial sawmill: simulation of harmonic emissions when adding new sawing lines, demonstrating that currents comply with imposed limits.
• Galvanizing plant: analysis of several operating scenarios, confirming that emissions remained below Hydro-Québec thresholds.
• Forest products plant: on-site measurement campaign with identification of 5th harmonic exceedances, followed by recommendations to correct the situation.
• Electric vehicle charger: measurement of harmonic currents at a heavy electric vehicle charging station.

• Expertise reconnue en études harmoniques selon la norme C.25-01.
• Rapports acceptés par Hydro-Québec, clairs et complets.
• Solutions pratiques pour corriger les non-conformités et optimiser vos installations.
• Accompagnement clé en main, de la collecte des données jusqu’à la validation finale.

Do you need to submit a harmonic current emission study to Hydro-Québec? Trust 3E Eng. to perform an accurate, reliable analysis that complies with the requirements of standard C.25-01.
Contact us today for a personalized quote.