🎧 New: AI-Generated Podcasts Turn your study notes into engaging audio conversations. Learn more

Instrument Transformers in AC Circuits
10 Questions
1 Views

Instrument Transformers in AC Circuits

Created by
@InfluentialJasper8694

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the two main reasons for using instrument transformers in measurement?

  • To extend the range of measuring instruments and to isolate them from high-voltage lines (correct)
  • To increase accuracy and to reduce cost of instruments
  • To decrease power consumption and to reduce size of instruments
  • To reduce power loss and to increase the safety of operators
  • What is the main advantage of using CT over shunts in ac circuits?

  • CT is cheaper than shunts
  • CT does not require careful designing of reactance and resistance proportions (correct)
  • CT is more accurate than shunts
  • CT is more reliable than shunts
  • What is a limitation of using shunts for circuits involving large current?

  • Shunts are not safe for the operator
  • The power loss in the shunt itself will become prohibitively high (correct)
  • Shunts are too expensive
  • Shunts are not accurate for large currents
  • What is a problem with using multipliers in measurement?

    <p>They can introduce errors in measurement due to inherent leakage current</p> Signup and view all the answers

    What is an advantage of using instrument transformers with ammeters?

    <p>They eliminate the need for careful designing of reactance and resistance proportions</p> Signup and view all the answers

    Why are measuring circuits involving shunts or multipliers not safe for the operator?

    <p>They are not electrically isolated from the power circuit</p> Signup and view all the answers

    What is an advantage of using a suitable multi-range CT or PT with a single-range instrument?

    <p>It allows the instrument to cover a wide range of measurement</p> Signup and view all the answers

    What is the main difference between a CT and a PT?

    <p>A CT is used for measuring current and a PT is used for measuring voltage</p> Signup and view all the answers

    What is the main reason why instrument transformers are used in measurement of voltage, current, energy, and power in ac circuits?

    <p>To extend the range of measurement and to isolate the measuring instrument from high-voltage lines</p> Signup and view all the answers

    What is a disadvantage of using multipliers in measurement?

    <p>They can introduce errors in measurement due to inherent leakage current</p> Signup and view all the answers

    Study Notes

    Instrument Transformers

    • Used in measurement of voltage, current, energy, and power in AC circuits
    • Two main reasons for use:
      • Extend (multiply) the range of measuring instruments
      • Isolate measuring instruments from high-voltage lines

    Types of Instrument Transformers

    • Current Transformer (CT): extends current ranges of instruments
    • Voltage or Potential Transformer (PT): increases voltage ranges

    Advantages of Instrument Transformers

    Over Shunts and Multipliers

    • No need for careful design of reactance and resistance proportions for shunts and meters
    • Can be used for circuits involving large currents without excessive power loss
    • No introduction of errors in measurement due to leakage current
    • No unnecessary heating due to power loss
    • Electrically isolated from power circuit, ensuring operator safety
    • Can cover a wide range of measurements with single-range, moderate-sized instruments
    • Can reduce overall cost by connecting multiple instruments to the same instrument transformer

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Learn about the use of instrument transformers in measuring voltage, current, energy, and power in AC circuits. Understand their importance in extending measurement ranges and isolating instruments from high-voltage lines.

    More Quizzes Like This

    Instrument Transformers Quiz
    18 questions
    EL25 Auto-transformers and Instrument Transformers
    37 questions
    EL25 Topic Assessment 2: Auto-transformers
    12 questions
    Auto-transformers and Instrument Transformers
    12 questions
    Use Quizgecko on...
    Browser
    Browser