Answer / v.selvakumar

mccb is a protect device,whenever short circuit fault
happens ,it will isolate healthy system from faulty system
due to heavy .changing the phase neutral in circuit not a
fault,it will work as normal circuit.

Answer / pratheesh

What Mr.Rajan mantioned is not correct. Core Balance CT,
CBCT (Also called as Zero CT)is used for detecting the
earth fault current.
MCCB is a protective device by sensing the load current. By
interchanging the Phase and Neutral wires, there will not
be any difference in the load current.
So MCCB will trip on higher load current such as overload
or short circuit.

Answer / rajan.l

Shunt Trip Coil is not connected with a core balanced CT

Answer / basayya hiremath

mccb is protectve divise over load and shotr ckt,dipinding
ka rating of the mccb supose 25 ka mcc using this mccb
withastading ofthe current up to 25ka .u whant when phase
and nutrul shotr downstrim side using the mcb this will
trip u what to nutrul protect or earth fualt u can use cbct
incomming side of the mccb with shunt coil in side the mccb
and defending opan idmt curv

sometime battery charged and then automatically charged when rectifier ON conition, is there any chances please clarify the same.

1 Answers  

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Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

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