Current Transformer Fundamentals

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CT basics for protection and metering.

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pejah ajers

Malaysia

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Current Transformer Fundamentals


Current Transformer FundamentalsVersion en ligne CT basics for protection and metering. par pejah ajers 1 What is the basic purpose of a current transformer (CT)? a To amplify current b To convert high primary current to a smaller, proportional secondary current. c To directly drive the load d To measure voltage instead of current 2 Why should a CT secondary never be left open? a It stops the primary current b It wastes energy c It improves accuracy d It can generate dangerous high voltage due to inductive kick. 3 What does the burden mean in CT terminology? a The primary current b The load connected to the CT's secondary. c The turns ratio d The core material 4 What is the knee-point voltage of a CT? a The voltage drop across the burden resistor b The voltage rating of the core c The maximum primary voltage d The secondary voltage at which the CT begins to saturate and accuracy falls. 5 What is magnetizing (excitation) current in a CT? a The secondary current b The core current that causes magnetization and losses, affecting accuracy. c The primary current d The load current 6 How does increasing CT burden affect accuracy? a Higher burden generally reduces CT accuracy. b Burden only affects voltage c Burden has no effect on accuracy d Higher burden improves accuracy 7 In an ideal CT, how is the secondary current related to the primary current? a I_s = I_p b I_s = I_p × (N_p + N_s) c I_s = I_p × (N_s / N_p) d I_s = I_p × (N_p / N_s). 8 What can cause CT saturation besides excess current? a Low frequency operation b Excessive burden or high primary current can saturate the core. c Using a 1:1 turns ratio d Small conductor size 9 Why is polarity marking important on a CT? a To choose protection type b To maintain correct phase relationship with the measurement system. c To set the burden d To indicate core material 10 Which frequency are CTs commonly designed for in power systems? a 20 Hz b 400 Hz c 50 or 60 Hz d 1 kHz

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Current Transformer Fundamentals

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À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Current Transformer FundamentalsVersion en ligne

par pejah ajers

What is the basic purpose of a current transformer (CT)?

Why should a CT secondary never be left open?

What does the burden mean in CT terminology?

What is the knee-point voltage of a CT?

What is magnetizing (excitation) current in a CT?

How does increasing CT burden affect accuracy?

In an ideal CT, how is the secondary current related to the primary current?

What can cause CT saturation besides excess current?

Why is polarity marking important on a CT?

Which frequency are CTs commonly designed for in power systems?