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What is C.T, why it is used and what care should be taken
for that while connecting?
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Answer Posted / bo
Care must be taken when selecting the Class of CT's. They have to be ordered specifically for their intended purpose. Metering CT's are highly accurate, but will saturate at network fault currents and cause maloperation if inadvertently used for protection.
CT secondary wiring must always have 1 ground connection, this is to prevent a dangerous voltage build up due to capacitive coupling from the Primary voltage which could be thousands of volts. (Ground connection is not required on LV installations below aprox 500V).
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