Chapter 1

Question 1

What is a Transformer?

Answer 1

An electrical device that converts voltage from either high voltage to low voltage or vice-versa.

Question 2

What is transforming voltage called?

Answer 2

Stepping-down or Stepping-up

Question 3

What will a Transformer only work on?

Answer 3

AC not DC

Question 4

What is the Source Side of a Transformer called?

Answer 4

Primary Side

Question 5

What is the Load Side of a Transformer called?

Answer 5

Secondary Side

Question 6

What is a Transformer essentially?

Answer 6

A machine with no moving parts

Question 7

What is the most widely used apparatus in the electric utility industry?

Answer 7

Transformer

Question 8

What two styles of Transformers are there depending on the configuration of the circuit?

Answer 8

Pole-Mounted and Pad-Mounted

Question 9

How is a Pole-Mounted Transformer attached?

Answer 9

With Hanger Bolts

Question 10

Where is a Pole-Mounted Transformer’s primary source of feed?

Answer 10

An overhead conductor

Question 11

Where is a Pad-Mounted Transformer located?

Answer 11

On either a concrete or fiberglass pad on the ground.

Question 12

Where is a Pad-Mounted Transformer’s primary source of feed?

Answer 12

Underground Conductor

Question 13

On the primary side, what are the high voltage bushings designated as?

Answer 13

H1 and H2

Question 14

What side of the Transformer is the H1 Bushing?

Answer 14

Left

Question 15

What side of the Transformer is the H2 Bushing?

Answer 15

Right

Question 16

On the Secondary side, what are the low voltage bushings designated as?

Answer 16

X1, X2 and X3

Question 17

What does the labeling of these bushings based on?

Answer 17

Polarity

Question 18

Which bushings have more insulation, the primary or secondary side?

Answer 18

Primary Side

Question 19

Where are the Primary Bushings located on the Transformer?

Answer 19

On the top

Question 20

Where are the Secondary Bushings located on the Transformer?

Answer 20

On the front

Question 21

On a Pad-Mounted Transformer which side is the Primary side?

Answer 21

On the left

Question 22

On a Pad-Mounted Transformer which side is the Secondary side?

Answer 22

On the right

Question 23

What are the Primary Bushings designated as on a Pad-Mounted Transformer?

Answer 23

H1A-Left

H1B-Right

Question 24

What are the Secondary Bushings designated as on a Pad-Mounted Transformer?

Answer 24

X1, X2 and X3

Question 25

Which set of Bushings has more insulation Primary or Secondary?

Answer 25

Primary

Question 26

What are Pad-Mounted Transformers equipped with and where is it located?

Answer 26

Bayonet Fuse above the Primary Bushings

Question 27

What are Bayonet Fuses used for?

Answer 27

Energizing and De-Energizing the Transformer

Question 28

What does kVA stand for?

Answer 28

Kilovolt-Amperes

Question 29

Where can you find the kVA?

Answer 29

Stenciled on the front of the Transformer

Question 30

What else is kVA called?

Answer 30

kW (Kilo-watt)

Question 31

What does Kilo stand for?

Answer 31

1000

Question 32

What will an average sized home draw?

Answer 32

6000 Watts (6kW) at Peak Load

Question 33

What will a large size home draw?

Answer 33

15,000 Watts (15kW) at Peak Load

Question 34

What is the kVA rating of the bank?

Answer 34

The sum of the kVA ratings of each Transformer

Question 35

What are the two main types of Overhead Transformers?

Answer 35

Conventional and CSP (Completely Self Protected)

Question 36

What does a Conventional Transformer need?

Answer 36

An external protective fused device, known as a Cutout or Switch, to protect it from fault current.

Question 37

What is the Cutout Switch also used to do?

Answer 37

Energize and De-Energize the transformer

Question 38

How is a CSP Transformer protected?

Answer 38

Internally by a current limiting fuse, and a Circuit Breaker that also energizes and de-energizes the secondary side of the Transformer

Question 39

What is on the outside protecting the transformer?

Answer 39

Lightning Arrestor