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Questions and Answers
What are the two main reasons for using instrument transformers in measurement?
What is the main advantage of using CT over shunts in ac circuits?
What is a limitation of using shunts for circuits involving large current?
What is a problem with using multipliers in measurement?
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What is an advantage of using instrument transformers with ammeters?
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Why are measuring circuits involving shunts or multipliers not safe for the operator?
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What is an advantage of using a suitable multi-range CT or PT with a single-range instrument?
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What is the main difference between a CT and a PT?
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What is the main reason why instrument transformers are used in measurement of voltage, current, energy, and power in ac circuits?
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What is a disadvantage of using multipliers in measurement?
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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
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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.