Parts of a transformer Flashcards
What is the core made out of?
Steel (iron)
Why is the core made out of steel?
To provide a low reluctance path for the magnetic circuit.
One coil consists of a _____ winding and ______ winding.
Primary and secondary
What is Winding form?
Winding form provides support for windings during winding process.
On the diagram of a transformer, orange stands for _______
Winding form.
On the diagram of the transformer, yellow stands for ________
LV core insulation
On the diagram of the transformer, Red stands for ________
LV winding
On the core diagram of the transformer, Blue stands for _______
Main gap
On the core diagram of the transformer, Pink stands for _________
HV winding
The LV winding is located under the HV winding, the LV insulation, or the air gap?
HV winding
Is the LV winding closer or farther from the core?
Closer
Is the HV winding farther or closer from the core?
Farther
Why is the main gap required?
To insulate the LV winding from the HV winding
Each winding requires ____ to connect from the terminals and winding
leads
Structural steel frames clamp the core together at the top and bottom or side to side?
Top and bottom
What is used to apply pressure from front to back of the core? Tie rods, Tie wraps, Core rods, Core wraps?
Core rods
Yoke pads are located at the top and bottom or sides of the coil?
Top and bottom
Yoke pads are made of conductive, insulating, or non-insulating material?
Insulating
Why do yoke pads use insulating material?
To support the coils from steel grounded points and allow cooling air to enter the coil
Mounting feet support the coil, core , or both coil and core.
Both
What is placed under the mounting feet to reduce transmission of vibrations? Anti-Vibration pads, Insulating pads, Foam Pads?
Anti-Vibration
Terminal boards are made of a conductive material. True/False?
False. They are made of an insulating material
What is the material called that terminal boards are made up of?
Glastic
Where can glastic be located with regards to the terminal?
Top, front, bottom, back
The steel used in cores is called_________
(Grain orientated) Laminated Silicon Steel
The top of the core is called the top yoke, top bearing, or top frame?
Top yoke
The bottom of the core is called the bottom leg, outer leg, or bottom yoke?
Bottom yoke
The core stack is another word for height, width, or depth?
Depth
For a single phase 3 leg core, are the outer leg widths 1/2, 3/4, or 1/4 in size?
1/2
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?
1/2
For a single phase 2 leg core, all legs and yokes are different widths (True/False)?
False. They are all the same width
How many coils can a single phase 3 leg core house?
1 coil
How many coils can a single phase 2 leg core house?
1 coil or 2 coils depending on the build
a single phase 2 leg core is used for higher or lower voltage ratings?
Higher
A 2 coil single phase 2 leg core houses how many coils?
2 coils
A 2 coil single phase 2 leg core is used for higher or lower voltages?
Lower
A single phase 2 leg 2 coil core is used for series, parallel, or series-parallel connections?
Series-parallel
A three phase 3 leg core houses how many coils?
3 coils
All legs and yokes of the 3 phase 3 leg core are the same width (True/False)?
True
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?
1/2
Interleaving accomplishes what?
- Reduces the effective gap which reduces Iex and core losses
- Provides additional friction providing better structural strength
