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  • Users: eletest
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  1. eletest

    Benchmarking Study for new project

    We are planning a new project at one of our Refinery. Select Gate-1 approval is in process and we are to move forward for Gate-2 & Gate-3 approval. One of our requirement is that of Bench Marking of our Project before the final investment approval is put to the Board for Approval. In this...
  2. eletest

    Motor operation at more than rated speed

    In one of our newly commissioned plants we have a motor Motor ( rating 415 V,2.2 KW,4.3 Amps, 1455 rpm).This motor is powered through VFD ( V/f control ). The normal operating range for the motor was 265 to 1465 rpm . However for meeting the process requirement , the motor is required to be run...
  3. eletest

    Fuel consumption / efficiency for gas engine

    What is electric efficiency and thermal efficiency for a gas engine ? If power output is given , how to calculate the fuel consumption ? Which efficiency will come in the calculation, electric or thermal ?
  4. eletest

    Emergency power requirement at a distance of 2 KM

    For our installation , we are planning a common emergency DG set (EDG) of 2000 KVA , 415 volts. However there is one location with anticipated requirement of 200 KVA which is approximately 2 km distance from the EDG. The location and the logistics do not allow a separate EDG set of 200 KVA to be...
  5. eletest

    Correlation between generating capacity and motor rating for DOL start

    We are planning a captive power generation of approximately 18 MW ( 3 x 6 MW gas engine driven generators). Can we go for a 1600 KW DOL start motor ? What is the correleation between the generator capacity and the maximum permissible rating of motor for DOL start ?Is there anything we can take...
  6. eletest

    Why is sand filling required inside a concrete cable trench ?

    As I understand , for directly buried cables , a layer of sand is provided before laying , and another layer is provided after laying for protection. However if I lay the cable inside underground concrete cable trench on cable trays , is it still required to fill the cable trench with sand. Does...
  7. eletest

    Cable gland size higher than the cable size.

    For our newly installed induction motor , the cable size used is 3C x 95 sq mm ( PVC , Armoured) , whereas the gland (double compression) size is higher ( suitable for 3C x 120 sq mm) . As a result there is a slight gap between the cable and the gland. Does this effect the Ex d protection of the...

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