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  1. arbil

    Transformers for grounded and ungrounded system

    We need one generator transformer (11/7.2 KV ,Dyn11 ) .The star side will be connected to ungrounded system and hence neutral will be isolated.However the delivery of the transformer is bit delayed .We are having a spare transformer of same rating , the only difference being that the spare...
  2. arbil

    Half cycle peak current in short circuit study

    What is the significance of calculating half cycle peak current during short circuit study ? Whether it will effect the circuit breaker ratings only or the bus bar ratings also?
  3. arbil

    NiCd battery or lead acid battery

    Which battery is better , Nickel Cadmium or Lead acid .If we want to replace an existing NiCd battery bank with lead acid , what are the factors we would have to consider ?
  4. arbil

    Auto transformer start motor tripping on prolonged starting time

    We are having a 6.6 KV,1500 KW motor with auto transformer starting .The tap setting of auto transformer is at 60% .As per the motor data sheet/curves,at 60% tap, the motor starting time is 11 seconds and thermal withstand time is 17 seconds. As per the control scheme , the changeover from auto...
  5. arbil

    Cable sizing calculation : short circuit withstand time selection

    For determining the cable size we are using the following formula S= I*SQRT(t)/K , where S= nominal cross sectional area of the conductor in mm2 I= Fault current in Amps k= constant based on type of cable t= short circuit withstand time in sec My question is , whether there is any standard for...
  6. arbil

    Star delta winding selection for motors

    What is the basis for selection of star/delta winding for motors ? If we chage the connection of an existing star motor to delta or vice versa , what will be the impact ?

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