Power Quality 2

Front 1

Finding a potential problem ____? It shuts the system down is perhaps the best PQ scenario

Back 1

Before

Front 2

It is usually wise to have the most ___? tool doing the monitoring until the source of the problem can be narrowed down

Back 2

Versatile

Front 3

The digital multi-meter is useful for detecting ___? and unbalances or

imbalances

Back 3

Voltage

Front 4

A 3% voltage imbalance between phases may result in the need to ____? electric motors by 10%

Back 4

De-rate

Front 5

Both voltage unbalance and harmonics are generally considered as ____? power quality problems

Back 5

Steady state problem

Front 6

Short duration disturbances, such as sags, seeks and transients, are often not ___? By dmm type meters

Back 6

Detectable

Front 7

Portable monitors use the ___? Approach to troubleshoot problems

Back 7

Reactive

Front 8

What makes the infrared imager one of the most popular tools for PQ monitoring

Back 8

Don't have to make contact with what your measuring

Front 9

What are infrared imagers used for

Back 9

Measure different temperature points in a system

Front 10

What effect can a heating and cooling cycle have in equipment

Back 10

Loosen mechanical connections

Front 11

A power quality instrument should be ____? For the anticipated range if the voltage and current levels

Back 11

Rated

Front 12

Fallow all installation and operating instructions and only use accessories ___? For the instruments

Back 12

Approved

Front 13

The installation, operation and maintenance of the instrument must be performed by ____? Personnel

Back 13

Qualified

Front 14

When accurate measurements are needed on sinusoidal waveforms to detect ___? Only true RMS meters should be used

Back 14

Distortion

Front 15

Connection to the voltage and current sources need to be made ____? And ___?

Back 15

Properly and safely

Front 16

Connections between an instrument in the circuit need to be made in accordance with the type of circuit being monitored and with the correct?

Back 16

Phase relationship

Front 17

Define transient

Back 17

Sub quarters cycle changes in the wave shape that usually do not trigger RMS variation (know this for the test)

Front 18

Parameters such as ___? Do not need to be checked every cycle but they are useful to trigger an alarm when the approach limits are reached

Back 18

Power factor

Front 19

Data collection and analysis will vary depending upon whether one is conducting a ____ or an ___? Exercise

Back 19

Audit and troubleshooting

Front 20

What does the connection of PQ equipment at the point of common coupling help differentiate

Back 20

Isolate what comes from utility from what originates in the facility

Front 21

Monitoring to establish a benchmark should be conducted for at least ___? To get a more complete picture of the electrical supply

Back 21

One week

Front 22

Voltage ___? Can have a damaging effect on motors and other electromagnetic equipment

Back 22

Voltage imbalance

Front 23

For benchmarks purposes, typically ____? And ___? Limits for sag and swell thresholds should be reset to ____? And ____?

Back 23

90% and 110%,

95% to 105%

Front 24

List the requirements which should be included if they more complete energy audit is desired over a typical Benchmark study

Back 24

Individual phase values for Watts, volt amps, VARS, power factor, harmonic power, total energy, demand

Front 25

The difference between service voltage and utilized voltage allows for ____? In facility wiring between the point of utility delivery and the utilization equipment

Back 25

Voltage drop

Front 26

In general, transients with peak values ___? The nominal voltage sine wave peak come within the problem causing range

Back 26

1.5 to 2

Front 27

DC offsets more than a percent or two of the ____? Voltage can have adverse effects on transformers

Back 27

Nominal

Front 28

The periodic cycling of energy demand is referred to as?

Back 28

On and off peak demand

Front 29

The ratio of watts to volt amperes is known as ___? Power factor

Back 29

True. (know for the test)

Front 30

You should be able to identify what problems of facilities equipment is experiencing after starting the monitoring program

Back 30

False, not after but prior

Front 31

When multiple locations in the facility have exhibited problems that may be attributed to PQ phenomena what is the recommended best practice point to begin troubleshooting

Back 31

At the PCC, point of the common coupling

Front 32

What is the likely direction or source of the fault condition if the current increases significantly when the voltage decreases

Back 32

Downstream towards the loads

Front 33

For a ___? Load, the current will decrease proportionally to the voltage drop. For a ____? load, current will not decrease or increase proportional to the voltage sag or swell

Back 33

Linear and non linear

Front 34

Where are customer power equality problems more likely to originate

Back 34

Inside customer facility

Front 35

How can you determine if there is current running through a ground conductor

Back 35

Measure neutral to ground voltage

Front 36

The ___? In two properly made ground connection causes current to flow in a ground Loop path with possible noise and or component failures

Back 36

Potential difference

Front 37

Lowering the ___? Between the source and the supply can lesson flicker effects

Back 37

Impedance

Front 38

Since fluorescent bulbs do not draw current ___? Lighting can be another source of PQ phenomena

Back 38

Linearly

Front 39

An unbalanced transformer will cause ___? As will over voltage ___? Of a transformer

Back 39

Harmonics and saturation

Front 40

____? Will cause the impedance to change, which will cause a device to draw different amounts of current

Back 40

Harmonics

Front 41

____? Can cause physical damage to a computer semiconductors and capacitors

Back 41

Transients

Front 42

In order to prevent premature failure, a motor should be de-rated due to which three findings

Back 42

Harmonic losses, negative sequence values, voltage unbalanced levels