Why is power quality important?
Electricity is a force. The human eye cannot see it, under normal conditions. It moves swiftly upon grids of electrical wires to apply force to illuminate spaces, rotate motors, power electrical and electronic instruments. Moreover, we expect the electricity we receive from our utility to be available at a constant and predicted value. In other words, we always expect our power quality to be good.
But, demands on the electrical grid can cause the expected and predictable power to vary from its expected predicted value. As a result, power quality becomes less than desired and can affect operations while adding to daily operational costs. This is known as poor power quality.
Power quality is a measure of the electrical system to ensure the electrical power is a constant and steady voltage that remains true to the predicted values.
Subsequently, varying energy demands can cause a disturbance on the electrical system or grid, causing it to deviate from the constant predicted value expected. Poor power quality can become the cause of production disturbances and higher energy costs. Moreover, it can lead to increased maintenance costs and decreased stability of installed equipment.
What causes an electrical disturbance or poor power quality?
- Harmonics – Often caused by nonlinear loads and devices on the electrical power system.
- Voltage Variations – Are sags, swells occurring when the line voltage is lower or higher than the nominal voltage for up to 10 seconds.
- System Unbalances – Often caused by variations in the load. When the load on one or more phases is different from the other(s), unbalanced voltages will appear.
- Transients– A change in the steady-state condition of voltage, current, or both. Transients are essential because any power system must be equipped to handle peaks in addition to the steady-state power.
- Flicker– Often caused by large current draws. For example, these include welding equipment, shredders, and large electric motors.
How can I determine what is causing the quality disturbance?
An Energy and Power Monitoring System (EPMS) will gather, analyze, and interpret electricity measurement data into useful information. Further, this system can be as simple as a single power quality meter installed at the electrical system’s front end or utility main.
So, a complete EPMS will have meters placed in the electrical system at strategic points. As a result, they can capture information from the utility and the distribution of the electrical power within a facility.
Are you unable to capture and report the power quality events that impact your facility?
In that case, you cannot make changes to eliminate the negative effects of poor power quality in your facility.
APT’s partners with all major equipment manufacturers for electrical power monitoring system products. In particular, this allows us to match a solution to your needs instantly. So, what are you waiting for? Leverage your installed energy monitoring infrastructure to minimize cost and improve reliability (before it costs you big).
Interested in the details from the large voltage sag this past weekend on Sunday, September 13th?
Check out our blog, We track utility PQ events due to the impact they have on our customers. Get this information to the people who need to know within your organization!
Brian Curnutt Service Manager APT
