Answer / kajanijam

If we use protection CT for metering purpose,its core has high saturation point.if any fault occurs, the core is not saturated.so it will damage the meters connected to CT secondary
and if we use metering CT for protection purpose,its core has low saturation point,so CT core saturated low value of current,so relay will be inoperative

Answer / sujeet pandey

Measuring CT needs to be very precise so its coil are better
quality than the protection CT. In case of wrong
connection,there will wrong reflection of primary current
which is not desirable.

If an induction motor is restarted before its rotor stop rotating, then what will be the amount of current drawn? Is this current will be the same as motor starting current?

5 Answers  

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0 Answers   Ebrahim Textile, Siemens,

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would the same effect be achieved by reversing the connection to one winding of the induction motor 3-phase?

0 Answers  

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What are electric motors?

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why 3 phase induction motor only need starter ? why not other motors need starter ?(like synchronous motor,single phase induction motors & their types) ?

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why do we prefer -48 volt instead of -24volt or -12 volt etc. ??

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A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

0 Answers   L&T,

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