Current Transformer

Explain why the secondary terminal of current transformer should not be lift open circuited.

Questions by auazar

Showing Answers 1 - 15 of 15 Answers

Gaurav Kamboj

  • May 22nd, 2009
 

As secondary of circuit has large number of turn, hence a large voltage appears across the secondary. Which may damage the circuit, therefore the secondaries are shorted.

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rajakumar1985

  • Jul 8th, 2009
 

Normally in a potential transformer, the primary current depends on the secondary side load. But in current transformer, the primary current does not depends on the secondary side load of current transformer. That will purely depends on the line where it is connected in series. So to equalise the primary MMF and secondary MMF of the current transformer, there should be a load in the secondary of current transformer. Suppose in the case of no load condition, there will be a heavy repeated accumulation of MMF will be  restrained in the current transformer core. This will provide a heavy shock if anybody touches the secondary of current transformer.

gkrishna89

  • Sep 17th, 2009
 

If the secondary of CT is left opened, there wont be any current flow in secondary thus increasing iron loss (eddy,hysteresis). This results in wastage of power in form of heat in th core. It also leads to saturation of the core.

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ravs42

  • Aug 21st, 2010
 

Due to high ratio,if the secondary is left open a very large voltage will be developed at the secondary.As a result the core vl be saturated n operator working nearby vl face severe accidents.

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