18 Questions
What is the purpose of using instrument transformers in ac circuits?
To extend the range of measuring instruments
What is the difference between a retardation lag and a time delay in system response?
Retardation lag shifts the response along the time axis, while time delay begins after dead time.
What contributes to the inability of conventional instruments to directly measure high currents and voltages in power systems?
High levels of currents and voltages
Which type of lag involves a response beginning immediately after a change in the variable?
Retardation lag
How do instrument transformers assist in isolating measuring instruments from high-voltage lines?
By multiplying the voltage and current levels
What is the primary reason for using instrument transformers to measure energy and power in ac circuits?
To extend the range of measuring instruments
What can result from inherent leakage current in multipliers?
Errors in measurement and unnecessary heating
Why are measuring circuits involving shunts or multipliers considered unsafe?
Due to high insulation requirements
What is a benefit of using clamp-on type or split-core type CT's for current measurement?
They do not require breaking the main circuit
Which type of instrument transformer is used to step down high voltages to a moderate level?
Potential transformer (P.T.)
How can single range moderate size instruments cover a wide range of measurement?
When used with a suitable multi-range CT or PT
Why can instrument transformers help in reducing overall cost?
Various instruments can be connected to the same instrument transformer
What is the primary function of a current transformer (CT)?
Step down current ranges of instruments
Why are instrument transformers necessary when measuring the current and voltage of large power equipment like alternators and transformers?
To step down high voltages for safe measurement
Which type of instrument transformer is used for extending the voltage ranges of measuring instruments?
Potential transformer (PT)
Why can't shunts be used for circuits involving large current?
The power loss in the shunt itself will be too high
What role does the primary winding of an instrument transformer play in the connection to power lines?
Links to the power line
How do instrument transformers help in isolating measuring instruments from high-power lines?
By stepping down the high voltage to safe levels for measurement
Test your knowledge about instrument transformers, including current transformers (CT) and voltage transformers (PT). Learn how these transformers are used to step down voltage and current for measuring instruments. Explore the primary and secondary windings connection to power lines and measuring instruments.
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