Power Quality

Power Quality Monitoring

Power Quality Monitoring is typically performed using a power disturbance analyzer. The analyzer is capable of monitoring voltage, current, and providing a detailed record when measurements fall outside pre-set limits. Power disturbance analyzers can be set to monitor the following general categories: high frequency events such as impulses and noise, voltage events (sags, swells, under voltage, over voltage and outages), distortions and frequencies.

Examples of current and voltage waveform graphs that power disturbance analyzers record are shown below:
Current waveform graph:

Voltage waveform graph:

Close follow-up during the first few days of monitoring is important in selecting proper data thresholds of the power disturbance analyzer. An adjustment in analyzer sensitivity may be necessary or relocation of the analyzer may become necessary if the analyzer does not record a power quality event that causes equipment to malfunction.

If you suspect that power quality is causing a problem in your facility, the Energy Services Department at HECO is here to assist you. Energy Services has a team of engineers that can record the power quality characteristics at your facility's electrical service using a power disturbance analyzer. The analysis of this data, customer's electrical disturbance log, and data gathered in the power quality investigation will allow HECO's engineers to determine if the source of the power quality problem is in your facility or HECO's electrical system. A customer's involvement in solving a power quality problem is extremely critical, as power quality monitoring will only provide a record of the power quality events. Finding the cause takes a cooperative effort from customers as you can provide crucial information regarding your facility.