Q .2

harmonics

Disturbance which affects the voltage and current waveform and is caused by non-sinusoidal loads. Generally, harmonics found in the system have relatively low frequencies and are usually responsible for industrial transformers and distribution lines overheating. They are also responsible for generating high currents and losses in the neutral in some installations, overcurrent trips in some protective devices and differential relay trips, etc.This is periodical voltage amplitude disturbance which has direct repercussions on incandescent light fl uctuations. This effect causes visual annoyance and produces tiredness if the phenomenon is permanent. This perception value has to be measured objectively (Pst). In many quality standards, (EN50160), Pst < 1 is admissible and not damaging.

Flicker

Power Quality Industrial analyzers

Selecting the power quality analyzer

For accuracy

Higher accuracy and much better performanceMeasurement of statistical values (basic)Interior application QNA 412 , 413 , 423 QNA-P QNA-PV QNA 403 QNA 303 Exterior application More parameters measured Less parameters measuredInterior application

For parametersmeasured

QNA 412 QNA P QNA 423 QNA-PV QNA 413 QNA 403 QNA 303 Exterior application 412423413403303

For type of client

Generation SubstationsSmall distribution substationLarge consumers Small consumer
More suitableLess suitable ...

Q2-3