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CT terminals

CT terminals

CT terminals

(OP)
Hi all, could anyone tell me what the test terminals on a window-type Current Transformer are intended for: what type of "tests" might we use them for?

Richard Byrne, E.E.T.

RE: CT terminals

Turns ratio (TTR)

RE: CT terminals

rbyrne15,
These terminals are used for a modified primary injection test.  An example would be 100:5:5 ratio - (primary:secondary:test). A small test current is injected into the 5 ampere test winding.  A replica current is generated in the 5 ampere CT secondary winding which is then fed to the protective relays.  You can now test the circuitry without the high currents/high voltages associated with primary injection testing.
Raisinbran

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