Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

POC > BES > Flashcards

BES Flashcards

1
Q

What is the Western Interconnection regional entity?

A

WECC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the 5 WECC power areas?

A 
California
Great Basin
Rocky Mountains
SouthWest
NorthWest
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is Ohm’s Law?

A 
V = IR
voltage =  current x resistance
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is Power Factor?

A

The ratio of True Power to Apparent Power
TruePower/AppPower = PF

OR

The ratio of Real Power to Apparent Power
RealPower/AppPower = PF

Thank you JanPorterWaffle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What range can Power Factor fall in?

A

0 to 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does a Switchyard differ from a Substation?

A

Switchyards don’t have XFMRs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What has a higher resistance? Aluminum or Copper?

A

Aluminum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are some sources of Reactive Power?

need only 4

A 
Over-Exciter Generators
Synchronous Condenser
Transmission Lines
Fixed Shunt Capacitor
Switched Shunt Capacitor
Fixed Shunt Reactor
Switched Shunt Reactor
Load Tap Changing XFMRs
Line Capacitor
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The power consumed with a XFMR is called “Power Loss”. What are the causes of “power loss”.

A

Hysteresis Losses
Eddy Current Losses
I2R losses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How is XFMR efficiency calculated?

A

Efficiency = OutputPower / InputPower X 100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

XFMRs operate on what principle?

A

Electromagnetic Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What qualifies a XFMR as a “Power XMFR” ?

A

A voltage of 69kV or above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are instrument XMFRs used for?

A

meters and relays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Explain an Auto XFMR?

A

A single winding goes into two windings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Do XFMRs with windings in STAR-STAR or DELTA-DELTA results in a phase shift?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

XFMRs with windings in STAR-DELTA or DELTA-STAR result in phase shift. Of how many degrees?

A

30 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What equipment is classified as part of the BES?

A
  • a single generator with an output of 20MVA or greater
  • a plant/group of generators with an aggregate output of 75MVA or above
  • Transmission lines with a voltage of 100kV or above
  • a XFMR with a voltage of 100kV or above on both the primary and secondary side
  • all associated auxiliaries and other shit I cant remember that are associated with the above 4
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is Corona

A

Ionization

that occurs when a conductor’s surface potential overcomes the dielectric strength of surrounding air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is Charging Current

A

current that flows, due to alternating charge/discharge of line, regardless of whether the circuit is closed or open

20
Q

What is a fault?

A

physical conditions that cause a failure to perform in the required manner

21
Q

What are some causes of faults?

And what is the cause Randy brought up was NOT a cause of a fault?

A

causes:
lightning, trees, line breaks, insulation wear, weather, vandalism, wind/ice, contamination, equipment failure, system disturbances

not cause:
a bird perched on a transmission line

22
Q

Faults within the protection zone are called:

A

internal faults

23
Q

Faults outside of the protection zone are called:

A

external faults

24
Q

If a system is over-generating it cause frequency to drop below the standard frequency (60Hz in this case),

A

False
over-generation increases frequency
under-generation decreases frequency

25
Q

During light-load periods the receiving end will have a ______ voltage than the source.

Higher or Lower? Why?

A

Higher

because of capacitance in the line

26
Q

What cancels some of the inductive reactance of the line?

A

Series capacitors

27
Q

What value do “differential relays” use for operation?

A

Current

“current in must equal current out”

28
Q

Does loop flow power travel in series or in parallel?

A

Parallel

29
Q

What is RAS?

A

Remedial Action Scheme
Functions performed to prevent overloading lines and losing critical facilities. These function include:
-tripping selected generators
-inserting capacitors or dynamic breaking resistors
-shedding load
-tripping selected transmission lines

30
Q

What is AGC?

A

Automatic Generator Control
Automatically adjusts generation from a central location. Uses computer control to maintain load/generation balance. Uses error signal called “Area Control Error” to function

31
Q

What are the Area Control Error (ACE) Modes Of Operation?

A
  • Tie Line Bias
  • Flat (constant) Frequency Control
  • Flat (constant) Tie Line Control
32
Q

Describe the function of a fault recorder

A

Log critical current and voltage at the time of any fault

33
Q

Define:

Minimum Load

A

smallest amount of load that a generator can sustain for extended period of time

34
Q

Define:

Response Rate

A

rate of load change that a generation unit can achieve for normal operation

35
Q

Define:

Unit Capability

A

Max possible megawatt output the generator can safely produce

36
Q

Define:

Efficiency

A

measure or how much output received for a given amount of input

37
Q

Heat Rate

A

the rate at which something heats up????

I dont fucken know.

UPDATE (from google)
Heat rate is one measure of the efficiency of electrical generators/power plants that convert a fuel into heat and into electricity. The heat rate is the amount of energy used by an electrical generator/power plant to generate one kilowatthour (kWh) of electricity

38
Q

What equipment is protected by Differential Relays?

A

Transformers
Transmission lines
Generators

39
Q

Describe the operating characteristics of:

Transfer Trip

A

(from google)
A protection system that sends a trip. command to remote circuit breakers. • Should Use a Protected & Dedicated communication link. PILOT CHANNEL

Direct Transfer Trips (DTT) are initiated from station relays when a severe event occurs in the substation. … If the breaker is at a remote location and can’t be physically wired, a DTT signal is sent to it via the protective relays using the PILOT CHANNEL.

40
Q

Describe the operating characteristics of:

Distance Trip

A

(from google)
Trip in which the relay functions depending upon the distance of fault in the line. More specifically, the relay operates depending upon the IMPEDANCE between the point of fault and the point where relay is installed.

41
Q

Describe the operating characteristics of:

Phase Comparison Trip

A

(from google)
compares the phase angles of the currents entering one terminal of a transmission line with the phase angles of the currents entering all the remote terminals of the same line.

(from book)
uses overcurrent fault detecting relays to compare the relative phase angles (Face Angels)

42
Q

Describe the operating characteristics of:

Directional Comparison Trip

A

(from google)
interprets the direction to the fault during a power system fault as an internal or external fault. … The relay system is to trip for an internal fault and block tripping for an external fault.

(from book)

  • uses directional comparison scheme
  • pilot channel used as a “blocking” system, rather than a tripping system
43
Q

Capacitors and Over-excited Generators _____ Vars

A

produce

44
Q

Reactors and other inductive devices _____ Vars

A

absorb

45
Q

What kinds of faults can occur on an electrical system

A
  • phase to ground (most common)
  • phase to phase
  • phase to phase to phase (rare)
  • phase to phase to ground

POC (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions