Understanding Transformer Concepts

What determines the polarity of a transformer?

• The direction the secondary coil is wrapped

• The color of the wires

• The size of the transformer

• The type of insulation used.

The polarity of a transformer can be either ______ or subtractive.

• Additive

• Multiplicative

• Divisive

• Subtractive

What happens if a transformer has an impedance of 2% at full load?

• The secondary voltage will be limited by 2%

• The primary voltage will increase by 2%

• The transformer will overheat

• The transformer will shut down.

Prior to installation, lineworkers always refer to the ______.

• Manual

• Nameplate

• Blueprint

• Circuit diagram

If the polarity is additive, where will the x1 bushing be?

• On the left-hand side

• On the right-hand side

• At the top

• At the bottom

The oscillation of the magnetic field in respect to the core creates which type of loss?

• Copper loss

• Iron loss

• Heat loss

• Sound loss

What is the acceptable impedance range for transformers when banking or paralleling?

• +/- 5%

• +/- 7.5%

• +/- 10%

• +/- 12.5%

CSP transformers have internal fuses that protect against ________.

• external faults

• internal faults

• voltage surges

• weight issues

What is the purpose of the internal secondary breaker in a CSP transformer?

• To increase voltage

• To disconnect hot legs during overload

• To adjust impedance

• To change oil levels.

What is the location of fuses in padmount transformers?

• Externally

• Internally

• On the nameplate

• Under the mounting bracket