Question 1 of 10
What is the primary function of a Current Transformer (CT) in a substation?
CTs are specifically designed to measure high currents in power systems, providing a safe and scaled-down current for measuring devices.
Question 2 of 10
Why are ammeters typically not directly connected to high-voltage lines in substations?
Direct connection of an ammeter to a high-voltage line would expose the meter to dangerous voltage levels, potentially causing damage and posing a safety hazard.
Question 3 of 10
What does a CT ratio of 100:5 mean?
The CT ratio indicates the relationship between the primary and secondary currents. In this case, 100:5 means that for every 100 amps flowing through the primary winding, 5 amps will flow through the secondary winding.
Question 4 of 10
Why is the secondary side of a CT usually shorted or connected to a low impedance device (like an ammeter)?
The secondary side of a CT must not be open-circuited. If it is, the core will saturate and generate a dangerously high voltage.
Question 5 of 10
In a 3-phase CT meter connection, how many CTs are typically used?
In a 3-phase system, one CT is required for each phase to measure the current in each line.
Question 6 of 10
What is the purpose of the primary winding of a CT?
The primary winding is connected in series with the high-current circuit and senses the current flowing through it.
Question 7 of 10
Where is the primary winding of a CT typically connected in a circuit?
The primary winding of a CT is connected in series with the circuit to measure the current flowing through the circuit.
Question 8 of 10
What type of transformer is a Current Transformer?
A current transformer is a type of instrumental transformer which are used for measurement purposes.
Question 9 of 10
What is the consequence of opening the secondary circuit of a CT while current is flowing in the primary?
Opening the secondary circuit creates a high voltage, which can overheat and damage the CT due to core saturation.
Question 10 of 10
What instrument is used to measure the secondary current of a CT?
An ammeter is used to measure the current in the secondary circuit of a CT.
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