Power quality issues in distribution system

What is a power quality problem?

To the untrained eye, problems in electrical distribution systems or the equipment connected to the circuit may not be recognizable as power quality problems. When no immediate problem is apparent, it may be written off as just an old breaker that needs replacing or a one-time nuisance reset.

What are the different types of power quality problems?

The most common types of Power Quality problems are presented below along with their description, causes and consequences: 1. Voltage sag (or dip) Description: A decrease of the normal voltage level between 10% and 90% of the nominal rms voltage at the power frequency, for durations of 0,5 cycle to 1 minute.

Do power quality problems shorten equipment life?

Assets damaged by power quality events that cause increased heat will certainly shorten equipment life. To the untrained eye, problems in electrical distribution systems may not be recognizable as power quality problems.

How to overcome power quality problems?

There are several ways to overcome power quality problems. Some of the common solutions are: The first step to overcome power quality problems is to conduct a power quality analysis. This involves measuring power quality parameters such as voltage, current, frequency, and harmonics to identify any adverse power quality events.

What is the problem with voltage unbalance in a power distribution system?

The problem with voltage unbalance within a power distribution system is that a small amount of voltage unbalance can cause a high current unbalance in loads such as electric motors. In general, voltage unbalance should not be more than 1%. Whenever there is a 2% or greater voltage unbalance, corrective action should be taken.

What is power quality disturbance?

Power quality disturbance is commonly defined as any change in power, voltage, current or frequency that interferes with the normal operation of the electrical equipment. This encompasses numerous types of disturbances.