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Questions and Answers
What is the purpose of using instrument transformers in ac circuits?
What is the purpose of using instrument transformers in ac circuits?
- To extend the range of measuring instruments (correct)
- To eliminate dynamic errors
- To increase operator safety
- To decrease the size and cost of instruments
What is the difference between a retardation lag and a time delay in system response?
What is the difference between a retardation lag and a time delay in system response?
- Retardation lag occurs after a time delay, while time delay occurs immediately.
- Retardation lag causes a shift in response along the time axis, while time delay does not.
- Retardation lag shifts the response along the time axis, while time delay begins after dead time. (correct)
- Retardation lag responds immediately after a change, while time delay has no immediate response.
What contributes to the inability of conventional instruments to directly measure high currents and voltages in power systems?
What contributes to the inability of conventional instruments to directly measure high currents and voltages in power systems?
- Lags in system responses
- High levels of currents and voltages (correct)
- Dynamic errors
- Retardation lags
Which type of lag involves a response beginning immediately after a change in the variable?
Which type of lag involves a response beginning immediately after a change in the variable?
How do instrument transformers assist in isolating measuring instruments from high-voltage lines?
How do instrument transformers assist in isolating measuring instruments from high-voltage lines?
What is the primary reason for using instrument transformers to measure energy and power in ac circuits?
What is the primary reason for using instrument transformers to measure energy and power in ac circuits?
What can result from inherent leakage current in multipliers?
What can result from inherent leakage current in multipliers?
Why are measuring circuits involving shunts or multipliers considered unsafe?
Why are measuring circuits involving shunts or multipliers considered unsafe?
What is a benefit of using clamp-on type or split-core type CT's for current measurement?
What is a benefit of using clamp-on type or split-core type CT's for current measurement?
Which type of instrument transformer is used to step down high voltages to a moderate level?
Which type of instrument transformer is used to step down high voltages to a moderate level?
How can single range moderate size instruments cover a wide range of measurement?
How can single range moderate size instruments cover a wide range of measurement?
Why can instrument transformers help in reducing overall cost?
Why can instrument transformers help in reducing overall cost?
What is the primary function of a current transformer (CT)?
What is the primary function of a current transformer (CT)?
Why are instrument transformers necessary when measuring the current and voltage of large power equipment like alternators and transformers?
Why are instrument transformers necessary when measuring the current and voltage of large power equipment like alternators and transformers?
Which type of instrument transformer is used for extending the voltage ranges of measuring instruments?
Which type of instrument transformer is used for extending the voltage ranges of measuring instruments?
Why can't shunts be used for circuits involving large current?
Why can't shunts be used for circuits involving large current?
What role does the primary winding of an instrument transformer play in the connection to power lines?
What role does the primary winding of an instrument transformer play in the connection to power lines?
How do instrument transformers help in isolating measuring instruments from high-power lines?
How do instrument transformers help in isolating measuring instruments from high-power lines?
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