Parts of a transformer

Question 1

What is the core made out of?

Answer 1

Steel (iron)

Question 2

Why is the core made out of steel?

Answer 2

To provide a low reluctance path for the magnetic circuit.

Question 3

One coil consists of a _____ winding and ______ winding.

Answer 3

Primary and secondary

Question 4

What is Winding form?

Answer 4

Winding form provides support for windings during winding process.

Question 5

On the diagram of a transformer, orange stands for _______

Answer 5

Winding form.

Question 6

On the diagram of the transformer, yellow stands for ________

Answer 6

LV core insulation

Question 7

On the diagram of the transformer, Red stands for ________

Answer 7

LV winding

Question 8

On the core diagram of the transformer, Blue stands for _______

Answer 8

Main gap

Question 9

On the core diagram of the transformer, Pink stands for _________

Answer 9

HV winding

Question 10

The LV winding is located under the HV winding, the LV insulation, or the air gap?

Answer 10

HV winding

Question 11

Is the LV winding closer or farther from the core?

Answer 11

Closer

Question 12

Is the HV winding farther or closer from the core?

Answer 12

Farther

Question 13

Why is the main gap required?

Answer 13

To insulate the LV winding from the HV winding

Question 14

Each winding requires ____ to connect from the terminals and winding

Answer 14

leads

Question 15

Structural steel frames clamp the core together at the top and bottom or side to side?

Answer 15

Top and bottom

Question 16

What is used to apply pressure from front to back of the core? Tie rods, Tie wraps, Core rods, Core wraps?

Answer 16

Core rods

Question 17

Yoke pads are located at the top and bottom or sides of the coil?

Answer 17

Top and bottom

Question 18

Yoke pads are made of conductive, insulating, or non-insulating material?

Answer 18

Insulating

Question 19

Why do yoke pads use insulating material?

Answer 19

To support the coils from steel grounded points and allow cooling air to enter the coil

Question 20

Mounting feet support the coil, core , or both coil and core.

Answer 20

Both

Question 21

What is placed under the mounting feet to reduce transmission of vibrations? Anti-Vibration pads, Insulating pads, Foam Pads?

Answer 21

Anti-Vibration

Question 22

Terminal boards are made of a conductive material. True/False?

Answer 22

False. They are made of an insulating material

Question 23

What is the material called that terminal boards are made up of?

Answer 23

Glastic

Question 24

Where can glastic be located with regards to the terminal?

Answer 24

Top, front, bottom, back

Question 25

The steel used in cores is called_________

Answer 25

(Grain orientated) Laminated Silicon Steel

Question 26

The top of the core is called the top yoke, top bearing, or top frame?

Answer 26

Top yoke

Question 27

The bottom of the core is called the bottom leg, outer leg, or bottom yoke?

Answer 27

Bottom yoke

Question 28

The core stack is another word for height, width, or depth?

Answer 28

Depth

Question 29

For a single phase 3 leg core, are the outer leg widths 1/2, 3/4, or 1/4 in size?

Answer 29

1/2

Question 30

For a single phase 3 leg core, are the top and bottom yoke 1/3, 2/3, 5/6, or 1/2 of the center leg width?

Answer 30

1/2

Question 31

For a single phase 2 leg core, all legs and yokes are different widths (True/False)?

Answer 31

False. They are all the same width

Question 32

How many coils can a single phase 3 leg core house?

Answer 32

1 coil

Question 33

How many coils can a single phase 2 leg core house?

Answer 33

1 coil or 2 coils depending on the build

Question 34

a single phase 2 leg core is used for higher or lower voltage ratings?

Answer 34

Higher

Question 35

A 2 coil single phase 2 leg core houses how many coils?

Answer 35

2 coils

Question 36

A 2 coil single phase 2 leg core is used for higher or lower voltages?

Answer 36

Lower

Question 37

A single phase 2 leg 2 coil core is used for series, parallel, or series-parallel connections?

Answer 37

Series-parallel

Question 38

A three phase 3 leg core houses how many coils?

Answer 38

3 coils

Question 39

All legs and yokes of the 3 phase 3 leg core are the same width (True/False)?

Answer 39

True

Question 40

For a 3 phase 5 leg core, the outer leg widths are 5/6, 1/2, 1/4, or 2/4 of the center leg width?

Answer 40

1/2

Question 41

Interleaving accomplishes what?

Answer 41

1. Reduces the effective gap which reduces Iex and core losses 2. Provides additional friction providing better structural strength