Which of the following is a pictured current...

Question 1 of 270705eccefa4bacbc34ba4d4810e

Which of the following is a pictured current transformer, usually used for current measuring instrumentation and over current protection circuits? See illustration EL-0177.

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Question 1 of 27070

Which of the following is a pictured current transformer, usually used for current measuring instrumentation and over current protection circuits? See illustration EL-0177.

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🔍 Key Concepts

• Current transformer (CT) physical appearance and construction • Difference between a window-type CT and a power or control transformer • How CTs are installed around bus bars or cables for metering and protection

💭 Think About

• Look for the device that is designed for a primary conductor or bus bar to pass through it rather than being directly wired to primary terminals like a normal transformer. • Ask yourself which option would most easily clamp or sit around a large feeder cable going to an ammeter or protective relay. • Compare how many windings and cores you can see: which one looks like it has a solid core with a single opening for the primary, and only small secondary terminals on top?

✅ Before You Answer

• Verify which illustration shows a circular or rectangular opening for a cable or bus bar to pass through – this is typical of a CT. • Check which devices look more like power or control transformers with primary and secondary winding terminals, which are not usually called current transformers. • Confirm that the chosen device could be mounted on a switchboard or around a feeder for instrumentation and overcurrent protection purposes.