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SCE Transmission 2nd Step > Miscellaneous > Flashcards

Miscellaneous Flashcards

1
Q

What is the equation to find Voltage?

A

E = I x R

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2
Q

What are the polarity bushing markings of a transformer?

A

H1 - X1

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3
Q

Describe Impedance

A

Opposition to current flow in an AC Circuit

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4
Q

What best describes transfer of energy in a transformer?

A

Mutual Inductance

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5
Q

What is the difference between a no-load and a load-tap changer?

A

Requires the transformer to be de-energized

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6
Q

What is the difference between AC and DC?

A

DC has a fixed polarity and AC does not

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7
Q

If the high voltage rating of a transformer nameplate read 12000 / 20780 WYE, what voltage would the transformer need across H1 - H2?

A

12,000

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8
Q

What is the rule of thumb for a 240V single phase transformer?

A

4A per kVA

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9
Q

Describe how a transformer works

A

Voltage is induced when a magnetic field moves across a secondary winding

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10
Q

What does a vector represent?

A

Magnitude and angle

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11
Q

What are the SCE Bulk Transmission voltages?

A

500kV and 220kV

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12
Q

What is measured in Ohms?

A

Impedance, Resistance and Reactance

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13
Q

What best describes the difference between AC and DC electricity

A

AC polarity alternates, while DC polarity does not

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14
Q

What do AC Generators consist of?

A
  • Loop of wire
  • Stationary Magnetic Field
  • Prime Mover
  • Permanent Magnet
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15
Q

What is the displacement between 3 phases of electricity?

A

120 Degrees

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16
Q

How many interconnected power systems cover parts of both the US and Canada?

A

4

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17
Q

Which part of the electric system is also referred to as “The Bulk Power System?”

A

Transmission

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18
Q

Which Substation operates at Distribution-level voltages?

A

“B” Bank

19
Q

What is an example of a “B” Bank Substation?

A

66kV / 12kV

20
Q

Typically, dry-cooled transformers will not be used above _____ kVA.

A

50kVA

21
Q

What type of cooling do SCE Distribution Transformers use?

A

oil or liquid immersed

22
Q

What function to potential transformers provide the Edison system?

A

Provide a proportionate value of voltage for metering

23
Q

What voltage would you get phase-to-phase when you wire three windings in WYE configuration?

A

The single winding times 1.73

24
Q

A 75kVA three-phase, wye-connected transformer has phase-to-neutral voltage of 120V. What is the line voltage?

A

240V

25
Q

How do you know if a transformer is additive or subtractive?

A

Read the Transformer Nameplate

26
Q

What is harmonic in an electrical system?

A

A multiple of the fundamental frequency of 60 Hz

27
Q

What is an advantage of delta transformer connections?

A

They trap third harmonics

28
Q

Vectors are useful in expressing electrical systems because they indicate both _____ and ____ of a force or quality

A

Magnitude and Angle

29
Q

What is the standard SCE phase sequence?

A

BAC, CBA

30
Q

How would current flow in the primary coil and secondary coil of a single phase transformer?

A

In H1 and out X1

31
Q

What are guy strain insulators used for?

A

To break and insulate a guy wire from the ground.

32
Q

What size guy wire does transmission use for span guys?

A

9/32”

33
Q

When would you use an anchor rod extension?

A

When raised grade changes are expected.

34
Q

What best describes the function and proper use of guy strain rods?

A

On tangent poles in wind-prone areas

35
Q

What is the preferred type of anchor to use in T & D construction?

A

Power-Installed Screw Anchor

36
Q

When would you use a plate anchor?

A

In extremely loose soil, inaccessible areas, and in rock or hard soil where a granite anchor cannot be satisfactorily installed.

37
Q

The hole for a plate anchor can be dug using___

A

A Shovel or other handtools or a backhoe

38
Q

What are overhead splices used at SCE?

A
  • Compression Line Splices

- Jumper Loop Splices

39
Q

How far apart must line splices be in the same span?

A

At least 100’

40
Q

Tools and materials used for overhead Transmission conductor splices include:

A

Hydraulic pump, press head, and hoses and compression dies

41
Q

What are the key steps of installing a repair splice?

A

Center the repair sleeve on the center of the damaged section of the conductor. Mark the center of the sleeve and tape the conductor strands together securely at each end of the sleeve. Make the outer layer of strands as tight as possible.

42
Q

Under arm PVC is used to

A

Protect wires

43
Q

Which of the following transformers are used in the SCE electrical system?

A

Current; Potential

SCE Transmission 2nd Step (1 decks)

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