Three-Phase Transformers Quiz

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What is the primary function of a three-phase transformer?

Convert single-phase power to three-phase power

Step up frequency for high voltage transmission

Convert AC power to DC power

Transfer electrical energy between circuits (correct)

Which winding configuration is characteristic of a three-winding transformer?

One winding only operating at multiple voltage levels

One primary, one secondary, and one tertiary winding (correct)

Two primary windings and one secondary winding

Three primary windings and no secondary winding

What advantage does a three-phase transformer provide in terms of space and cost?

Allows for multiple voltage levels in a single unit (correct)

Eliminates the need for transformers completely

Requires less insulation

Offers a smaller footprint due to fewer components

What is the primary advantage of using special industrial loads in a three-phase system?

Helps in balancing the load. Signup and view all the answers

What is the main use of On-Load Tap Changers (OLTC)?

To change taps without interrupting the load current Signup and view all the answers

What operational requirement differentiates Off-Load Tap Changers (DETC) from On-Load Tap Changers (OLTC)?

They operate manually or automatically when de-energized Signup and view all the answers

Which component is specifically designed to adjust voltage while the load is in operation?

On-load tap changer Signup and view all the answers

In a Scott connection, how is the main transformer configured?

Connected between the first two phases only Signup and view all the answers

What is the purpose of a Scott connection in power systems?

Converts three-phase power to two-phase. Signup and view all the answers

How does inrush current behavior differ between power and distribution transformers?

Inrush current in distribution transformers is generally smaller. Signup and view all the answers

Which application is commonly associated with the use of Scott connections?

Railway electrification systems Signup and view all the answers

What aspect of voltage regulation does a tertiary winding improve in a three-phase transformer?

Improves voltage regulation Signup and view all the answers

What characterizes the no-load current waveform of both power and distribution transformers?

Consists of a fundamental sinusoidal component along with harmonics. Signup and view all the answers

What type of electrical power is typically transmitted using three-phase transformers?

Three-phase electrical power Signup and view all the answers

What is a significant challenge associated with the inrush current phenomenon?

It can cause nuisance tripping of protective devices. Signup and view all the answers

Which statement about tap changers is correct?

They help regulate transformer output voltage Signup and view all the answers

What is the effect of harmonics in the no-load current of distribution transformers compared to power transformers?

Higher magnitude of harmonics. Signup and view all the answers

What is the benefit of a three-winding transformer in power systems?

Offers multiple voltage levels. Signup and view all the answers

Which technique can be employed to control inrush current in transformers?

Implementing pre-insertion resistors. Signup and view all the answers

For what type of adjustment is an off-load tap changer suitable?

Voltage adjustments when the transformer is de-energized. Signup and view all the answers