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Electrical Grid 1 > Substations and Transmission - Possible Test Questions - WEEK 5 > Flashcards

Substations and Transmission - Possible Test Questions - WEEK 5 Flashcards

1
Q

What are the three main functions of a generator?

A
  • Change the voltage of circuits from one level to another.
  • Connect or disconnect lines or equipment from each other.
  • Control the flow of power by adjusting the voltage and current
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2
Q

What are commonly known as switching stations?

A
  • Transmission substations that only have equipment that can connect or disconnect lines or equipment from each other.
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3
Q

Purpose of a generation substation?

A
  • Is designed to step up the voltage that is produced by the generators of a power plant so it can be transported to where it will be used
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4
Q

Purpose of transmission substations?

A
  • Typically installed to help change the voltage levels to help integrate a system.
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5
Q

Transmission substations typically have several ____________ lines coming into and leaving the station.

A
  • transmission
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6
Q

A typical transmission substation may provide a voltage change from ___ kV to ___ kV.

A
  • 500 kV to 230 kV
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7
Q

Main function of a subtransmission station?

A
  • Change the voltage from higher transmission voltage such as 345 kV to a subtransmission voltage such as 69 kV, which can then be used to distribute power to distribution substations within the the load center.
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8
Q

What type of substation would be stationed in the middle of the load stations and located within 4 to 10 miles of each other within a densely populated area.

A
  • Distribution Substation
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9
Q

Distribution Substations would change voltage from what?

A
  • 69 kV to 12 kV
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10
Q

List a few of the Substation equipment.

A
  • Power Transformer
  • Circuit Breakers
  • Disconnect Switches
  • Current and Potential Transformers
  • Capacitors and Reactors
  • Voltage Regulators
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11
Q

These are used to change the voltage from one level to another.

A
  • Power Transformer
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12
Q

Power Transformers contain large volumes of what?

A
  • Insulating Oil
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13
Q

These are used to connect and disconnect lines and equipment

A
  • Circuit Breakers
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14
Q
  • These are typically installed in substations in order to isolate lines and equipment to be worked on. They are also installed to provide a means to connect or disconnect parts of the station to reroute the flow of power.
A
  • Disconnect Switches
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15
Q

These devices provide a reduction in the voltage and current so the power flow can be measured. They also sense abnormal amounts of voltage and current, which is used to disconnect lines and equipment during trouble conditions.

A
  • Current and Potential Transformers
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16
Q

These devices are used to assist in controlling the flow of power on the system.

A
  • Capacitors and Reactors
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17
Q

These devices are use to automatically adjust the voltage as required.

A
  • Voltage Regulators
18
Q

Purpose of Steel Structures?

A
  • Are used to terminate lines entering and leaving the station. Also used to mount switches, disconnects, bus conductors and other equipment.
19
Q

Key Functions of the Ground Grid?

A
  • Provide a path to Earth for lighting surges
  • Provide a ground reference source for transformers and the associated system neutral conductor
  • Provide a ground source for other station equipment
  • Ensure the safety of the workers in the station by limiting ground potential differences
  • Ensure the safety of the public who may be near the station fence during a fault condition
  • Limit the influence of faults to communication facilities entering the station
20
Q

List the Environmental Considerations when constructing a substation.

A
  • Appearance of the Station
  • Electromagnetic Fields
  • Sound
  • Oil Spill Containment
  • Fencing
21
Q

The Ground Grid is a critical element in what?

A
  • Mitigating hazards to workers and the public.
22
Q

How far down would you find the ground grid?

A
  • 12 to 18 inches
23
Q

What type of wire normally consists within the ground grid?

A
  • Large Stranded Copper Wire
24
Q

Substations are typically designed with room for _________.

A
  • expansion
25
Q

What kind of system closely relates to our transmission system.

A
  • Interconnected freeways
26
Q

What is the main objective for all transmission lines?

A
  • Deliver power with minimal loss in power
27
Q

Types of current when dealing with transmission lines?

A
  • Alternating Current

- Direct Current

28
Q

Direct current which has:

A
  • less line losses and only takes two conductors (positive and negative), can be economical for large amounts of power over long distances.
29
Q

List the types of Transmission Line Structures

A
  • Wood Pole Structures
  • Tubular Steel Pole (TSP)
  • Lattice-Type Steel
30
Q

Wood Pole Structures operate from how many volts?

A
  • 345 kV lines and below
31
Q

Lattice-Type Steel structures operate from how many volts?

A
  • 345 kV lines and above
32
Q

Objective of an Insulator:

A
  • Insulators must insulate the line and have the strength to support the conductors.
33
Q

Types of commonly used insulators used on transmission lines:

A
  • Porcelain suspension insulators
  • Porcelain line post insulators
  • Polymer suspension insulators
  • Polymer line post insulators
  • Glass suspension insulators
34
Q

Objective of a Conductor:

A

The conductor must have the capacity to carry the power and to be strong enough to support itself under high tension.

35
Q

True or false: The size of an insulator needs to change based on voltage increase?

A
  • True
36
Q

Conductors on a line are typically made in strands from what?

A
  • Aluminum or some form of aluminum alloy
37
Q
  • For transmission lines that deliver large amounts of power at extra high voltages, what is typically used?
A
  • Bundled Conductors
38
Q

The conductors used can be up to _____ inch in diameter and weight _____ lbs per foot.

A
  • 1-3/4

- 2-1/2 lbs

39
Q

Objective of Shield Wires (or Static Wires):

A
  • Provide a path to ground for lightning surges.
40
Q

How would you recognize shield wire?

A
  • One or two smaller conductors fastened to the top structures above the phase conductors.
41
Q

Functions of Shield Wire

A
  • The outer portion of the conductor will connect the lightning surges to the ground.
  • The inner fiber optic conductor will provide capacity for voice and data communication.
42
Q

How long can it take to secure rights-of-way to build a major transmission line?

A
  • Three to five years

Electrical Grid 1 (5 decks)

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