CT symbols

[deArc]

What is the difference in the 2 CT symbols in the attachment?

Thank you


deArc

 

[ScottyUK]

What format is the file?


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If we learn from our mistakes I'm getting a great education!

 

[dpc]

The extension indicates a WordPerfect file, that not too many people are going to be able to open. Try posting a .pdf.

 

[deArc]

uploaded attachment in .doc.

 

[davidbeach]

The upper one is 3 CTs, one one each phase. The lower one is a single CT around all three phases or around the neutral (not quite sure about the triangle).

 

[deArc]

Thank you very much davidbeach.

I'm new in this field but was told the triangle is a cable termination or starting point. Don't remember the defining word.

 

[rcw retired EE]

The upper symbol shows three 800/5 CT’s, one on each phase, most likely in switchgear, mounted on the outgoing load bus or on the circuit breaker stab assemblies.

The triangle represents the cable terminations.

The lower CT symbol shows a zero sequence CT, 100/5 ratio, encircling all three phase cables to measure ground fault current. The two lines on either side of the main power one line in the symbol represent the other two phases going through the one CT. The CT is probably a doughnut CT with a larger opening, mounted in the cable compartment of the switchgear so the cables can pass through on their way to the bus connection.