Answer / k.prakashchandra

UG cables have to be used when indoor breakers(11KV) are
employed.They are connected to the outgoing lines at the
outdoor structure after step-down.

what is the permissible bend in the LT& HT CABLES.

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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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which stabilizer is better ? AVR, Servo Stabilizer, Static stabilizer etc & why explain it

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for a 11kv transmission line what capacity of CTs & PTs are required?

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if the transformer at full load have a iron loss =900w and copper loss = 1600w . what percent of the load will the transformer has a maximum efficiency?

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In CDG type IDMTL realy O/L , E/F, O/C which are used for out going feedrs,on R-phase o/c element, Y-phase , e/f elecment and on b -phase o/c element will be connected . Why the earth fault on center phase only, why not on other two phases?

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Which type of questions well asked. ?

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When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

0 Answers   UOM,

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We have .ht motor which is 60Hz.we run on 50Hz.so that it's speed reduce but we had one prob.that motor winding temp increase up to 135 deg.we want reduce this temp.what to do?we arrange ext.cooling fan but not much effect.we want reduce this temp. Inhouse without affecting much.cost. also don't want reWINDING OF MOTOR?

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why do some transmission towers have two insulators at one side and three insulators at the other side

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explain types of electric welding and its applications

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How to calculate cable size by using load.?? Any formula...

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