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Electricity Service
Power Quality
You expect to be able to count on a high-quality power supply. And for Hydro-Québec, it's a priority. Our system meets the quality and reliability standards of the Northeast Power Coordinating Council (NPCC), which regulates transmission providers in northeastern North America and has some of the most stringent criteria on the continent.Power Quality
In spite of all the efforts deployed to ensure reliability, however, it's normal for any power system to experience occasional outages and disturbances. At Hydro-Québec, we do everything we can to prevent such incidents and minimize the inconvenience to you.
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Did you know? For Hydro-Québec, power system reliability is a priority and every effort is made to limit outages and guarantee a supply voltage within the prescribed range. |
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| Supply voltage Hydro-Québec guarantees you voltages within the limits specified in Standard CAN3-C235-83 of the Canadian Standards Association (CSA) for low- and medium-voltage power systems. If you notice that the voltage you're receiving is outside the normal range (120-V supply, for example, should be between 106 V and 127 V), contact a Hydro-Québec representative so that we may address the problem. |
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Scheduled outages New advanced-technology equipment and automatic controls are increasingly being used to maintain and repair the system without cutting the current. However, there are still cases where service interruption cannot be avoided. Whenever possible, such interruptions are scheduled outside normal operating hours, and you are notified in advance of the time and duration of the outage. |
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*V: volts *Y: Y connection
Note: If the voltage fluctuates within the limits specified in the yellow section of the above table (normal operating conditions), no improvements or remedial measures are necessary. If it remains within the limits specified in the gold section (marginal operating conditions), improvements or remedial measures must be planned according to a clearly defined program, but no immediate action is required. If the voltage exceeds these limits, however, immediate action must be taken.
Power disturbances
Power quality disturbances are waveform distortions that affect the grid and are often caused by various devices (powerful motors, air conditioners, etc.). They may interfere with the operation of equipment, depending on how well the equipment is protected and how severe the disturbance is.
The problem can be corrected, however, and equipment can be made more compatible with the supply voltage. Solutions must be assessed on a case-by-case basis by an expert (master electrician or engineer), who will look at the cost and the impact on your company's production.
Power quality disturbances are waveform distortions that affect the grid and are often caused by various devices (powerful motors, air conditioners, etc.). They may interfere with the operation of equipment, depending on how well the equipment is protected and how severe the disturbance is.
The problem can be corrected, however, and equipment can be made more compatible with the supply voltage. Solutions must be assessed on a case-by-case basis by an expert (master electrician or engineer), who will look at the cost and the impact on your company's production.
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