Power Quality Final Flashcards
Two advantages of using line reactors
Reduce electrical noise
Reduce transients
Power quality problems that have multiples of the fundamental frequency are known as what
Harmonics
Power quality problems that cause incorrect signals to be sent to input modules or equipment, are referred to as what?
Noise
Power quality problems that reduce insulation life damage equipment and have fast bulb burnouts are known as what
Over voltage
Power quality problems that are caused by abrupt increases in source, impedance, or loose connections are typically known as
Sags
When excessive heat is noticed on a standard transformer, what is the probable cause
Non linear loads
What are potentially the most damaging type of power disturbance?
Transients
Three methods used to deal with problems associated with harmonics
Installation of K rated transformers
Harmonic filters
Oversizing, neutral conductors 
Four types of problems harmonics cause
neutrals to overheat
Burn up transformers
Burn up motors
Distort the voltage, sine wave
What is used to help protect against impulsive transient, swells, and other high-voltage conditions?
Metal oxide varistor
Seven categories of power quality disturbances
Transient
Interruptions
Sag
Swell
Wave distortion
Voltage fluctuation
Frequency variation
The seven power quality problems
Nuisance circuit, breaker, tripping
Flicker
Motor burnout
Equipment control problems
High temperatures in server rooms
Computer crashes or lock ups
False alarm trips on PLCs and VFD’s 
This is usually caused by Highwinds or animal contact
Voltage spikes
The term if the voltage sine wave is too high
Swell
Excessive currents in neutral conductors with non-linear loads is caused by what?
Triplen harmonics
