Power Quality Analysis

Question 1

Which is a PQ issue resulting from switching Capacitor Banks?

Accepted Answer

Transient Spikes

Question 2

Which of the following is NOT a classification of Power Inturruption:

Accepted Answer

Brownout

Question 3

How long does a MOMENTARY disruption last?

Accepted Answer

Less than 3 seconds

Question 4

Which of the following does NOT describe Transients with reference to PQ:

Accepted Answer

Wanderers

Question 5

Approx 60% of electronic loads operate non-linear. This develops which PQ issue?

Accepted Answer

Harmonic Frequencies

Question 6

Can a voltage transient be created by line switching?

Accepted Answer

Yes

Question 7

Which of the following are NOT the effect of voltage deviations on lighting?

Accepted Answer

Exploding lamps

Question 8

Which harmonic seems to cause the most problems for power quality?

Accepted Answer

3d

Question 9

What is the most common cause of Transients in a system?

Accepted Answer

Switching reactive (XL or XC) loads

Question 10

An imbalance of up to 10% is considered acceptable for?

Accepted Answer

Current

Question 11

Where do most power quality issues stem from?

Accepted Answer

Within the facility

Question 12

What is a non-linear load?

Accepted Answer

Rectified Loads (AC - DC)

Question 13

DC offsets are usually caused by:

Accepted Answer

failure or cheap construction of AC-DC rectifiers

Question 14

What causes neutral currents in a 3ph, BALNCED system to vectoraly add to up higher than 0A?

Accepted Answer

Triplen harmonics

Question 15

What is a Transient with reference to PQ issues?

Accepted Answer

Sudden peak of E or I

Question 16

Which corrective device monitors systems for harmonics, injecting appropriate inverse currents?

Accepted Answer

Active filter

Question 17

What is produced when intentional or unintentional arching occurs in a system?

Accepted Answer

Electrical Noise

Question 18

Which of the following is NOT an instrument for power quality analysis?

Accepted Answer

Dynomometer

Question 19

The sequence of harmonics that push a motor drive in reverse:

Accepted Answer

Negative

Question 20

Digital clocks and process control equ. rely on the timing regulation from the:

Accepted Answer

Fundamental sinusoidal wave form

Question 21

The crest factor of a waveform is the ratio of which values?

Accepted Answer

RMS and Peak Voltage

Question 22

What is the term for when the system voltage exceeds nominal by 10% for more than 1 minute?

Accepted Answer

Over Voltage

Question 23

Which of the following would NOT be a cause of Supply Side PQ issues?

Accepted Answer

Bank of fluorescent lights

Question 24

A sustained voltage interruption is called a Blackout. What is the name for an UNDER voltage?

Accepted Answer

Brownout

Question 25

What causes Electrical Noise?

Accepted Answer

Arching in the system

Question 26

Why would you want to connect a PQ analyzer to a system for a long period of time?

Accepted Answer

Data logging to identify trends

Question 27

What causes over loading of neutral conductor?

Accepted Answer

Triplen Harmonics

Power Quality Analysis

Questions 27

Power Quality Analysis

Questions 27