Power Quality Quiz

Residential customer light flicker

Can be caused by the customer's heat pump

Can be caused by the customer's neighbor's heat pump

Can be caused by distribution voltage fluctuations

All are correct

A change in light intensity from incandescent bulbs can be perceived for voltage sags as small as....?

0.25%

10%

15%

Distribution system capacitors can affect harmonics by...?

Altering the flow of harmonics on the system

Creating a resonance with system impedance

Do not affect harmonics since they are for power factor correction

Altering the flow of harmonics on the system and creating a resonance with system impedance

The objective when monitoring in response to a customer complaint is to...?

Determine the supply compatibility with customer equipment requirements

Satisfy the customer by making a power quality recording

Determine the contribution of customer loads to the voltage disturbances

Determine the supply compatibility with customer equipment requirements and determine the contribution of customer loads to the voltage disturbances

Electric system impedance

Increases fault current

Is mostly resistive

Is mostly inductive

Determines load power factor

A voltage swell is defined as...?

A short duration in RMS voltage

An over-voltage event that can damage equipment

A voltage regulation problem

A short duration in RMS voltage and an over-voltage event that can damage equipment

A voltage sag is defined as...?

A short duration drop in RMS voltage

A temporary condition that damages equipment

A voltage regulation problem

All are correct

Transformer losses increase due to harmonics because….?

Increased winding losses

Increased core losses

Customer loads are unbalanced

Increased winding losses and increased core losses

The power quality monitoring process should include...?

Setting monitoring objectives prior to recorder initialization

Inspection of voltage, current, and communication leads

Setting event trigger thresholds

All are correct

Power quality standards are...?

Law, therefore their limits must be met by customers

Law, therefore their limits must be met by utilities

Law, therefore their limits must be met by customers and utilities

Are recommended practices, not law

Voltage unbalance

Can be measured in single phase and three phase systems

Applies to three phase systems

Can be caused by unbalanced single phase loads

Applies to three phase systems and can be caused by unbalanced single phase loads

Power quality standards are developed by...?

State regulatory commissions

The federal government

Developed by people most affected by their application as a consensus of best practice

Qualified electrical engineering departments of state universities

Voltage sags

Do not damage equipment

Can cause equipment to shut down

Do not damage equipment and can cause equipment to shut down

Are only a light flicker issue

Voltage unbalance is harmful to induction motors because...?

Small voltage unbalance causes disproportionately larger unbalance of phase current

Causes a considerable increase in motor temperature

Causes a counter rotating magnetic field in the motor

All are correct

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