S4 - Reactive Power

Question 1

The commonly used term for the electrical potential difference between two points across an element

Answer 1

Voltage

Question 2

Voltages at higher levels, such as 4,000 volts and higher. Distributors own and operate most of the lines built at high voltages. It allows distributors to run lines longer distances and serve more customers

Answer 2

Primary Voltage

Question 3

Voltages at lower levels, or the voltages that are actually used inside buildings by customers, such as 120 volts or 480 volts

Answer 3

Secondary Voltages

Question 4

The rate of flow of electric charge in a conductor between two points having a difference in potential.

Answer 4

Current

Question 5

The total opposition offered by an electric circuit to the flow of an alternating current. It is a combination of resistance and reactance, measured in ohms

Answer 5

Impedance

Question 6

This can affect the power flow, voltage drop, the available fault currents, and losses in a circuit

Answer 6

Impedance

Question 7

The current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them

Answer 7

Ohm’s Law

Question 8

On this circuits with a multi-grounded neutral, the neutral normally carries 40 to 60% of the current

Answer 8

Single Phase Circuits

Question 9

This type of phase utilizes a single phase conductor and single neutral

Answer 9

Single Phase

Question 10

In this phasing the neutral may carry up to 50% of the current.

Answer 10

Two Phase

Question 11

This type of phase utilizes two phase conductors and a single neutral

Answer 11

Two Phase

Question 12

In this phasing with a balanced load, the neutral carries almost no current.

Answer 12

Three Phase Four Wire

Question 13

In this phasing with an unbalanced load, the neutral carries approximately the difference between the high phase current and the low phase current.

Answer 13

Three Phase Four Wire

Question 14

This type of phase utilizes three phase conductors and a single neutral, or a four-wire multi-grounded system.

Answer 14

Three Phase Four Wire

Question 15

This type of phase utilizes three wire systems with no neutral.

Answer 15

Three Phase Three Wire

Question 16

On this phase, single-phase loads are connected phase to phase lines have two of the three phase conductors.

Answer 16

Three Phase Three Wire

Question 17

The difference between the high phase amps and the low phase amps, as long as the power factor is similar on all three phases

Answer 17

Approximate Neutral Current

Question 18

The is the power used by loads to do work.

Answer 18

Real Power

Question 19

The is the capacity that EPB has to provide

Answer 19

Apparent Power

Question 20

The closer EPB can equalize ________ to _____, the more efficient the power system becomes

Answer 20

Apparent Power (S) to Real Power (P)

Question 21

The ratio of the Real Power to Apparent Power

Answer 21

Power Factor

Question 22

Measures the delay between when the voltage pushes the electrons and when they actually begin to flow

Answer 22

Power Factor

Question 23

Defines both, how much of a delay there is and, more importantly, what percentage of the current is actually doing work

Answer 23

Power Factor

Question 24

The magnetizing component of power required by the circuit. It is necessary to establish the magnetic flux and is referred to as VARS. It can be supplied by a motor or generator.

Answer 24

Reactive Power

Question 25

On an electric system with no power factor correction, does the current lag the voltage or does voltage lag the current?

Answer 25

Current lags Voltage

Question 26

What is a “perfect” power factor?

Answer 26

1 or 100%

Question 27

The amount of power consumed on a power system

Answer 27

Load

Question 28

The amount of _____ changes based on numerous factors that include weather, processes and activity of customers, and addition of new customers

Answer 28

Load

Question 29

The total Energy consumed over a period of time is measured in this unit.

Answer 29

Kilo-Watt-Hours

Question 30

The greatest of all demands which have occurred during the specific interval of time

Answer 30

Maximum Demand

Question 31

The ratio of the corresponding maximum demand of two or more loads to the sum of the non-coincident maximum demand for these loads for a given period

Answer 31

Coincident Factor

Question 32

The ratio of the average load over a designated period of time to the peak load occurring in that interval

Answer 32

Load Factor

Question 33

Indicates the amount of usage of the system’s equipment and is a measurement of efficiency

Answer 33

Load Factor

Question 34

Occurs when one or more electrical conductors contact ground and/or each other

Answer 34

Faults

Question 35

The electrical current that flows through a circuit during an electrical fault condition.

Answer 35

Fault Current

Question 36

Several times larger in magnitude than the current that normally flows through a circuit.

Answer 36

Fault Current

Question 37

One phase conductor makes contact with the ground

Answer 37

Single Line to Ground Faults

Question 38

Two phase conductors make contact with the ground

Answer 38

Double Line to Ground Faults

Question 39

Three phase conductors make contact with the ground

Answer 39

Three Phase Faults

Question 40

The phase conductor makes contact with another item, such as a tree, ice, or other high impedance path to ground

Answer 40

High-Impedance Faults

Question 41

-Fault current flows from the source through the single path to the location of the fault

Answer 41

Radial

Question 42

-Has two or more sources
-Faults results in all sourse breakers operating
-Fault current flows from all sources through separate paths to the location of the fault

Answer 42

Loop