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  • Users: sakaran51
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  1. sakaran51

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    Hi, I was going through a book on Electronic Principles on Active filters. While on the subject of Sallen-Key second order low pass filters,I came across the following statements: Butterworth and Bessel Responses "When analysing a circuit,we start by calculating Q and fp(pole frequency).If...
  2. sakaran51

    Baby BFP

    Hi I am not a pump engineer but basically an electrical engineer.I had come across a pump vendor who insists for a baby boiler feed water pump with a speed of 3350 RPM.It is used to maintain the water level in the boiler, during power failure when main BFPs could not be run due to DG capacity...
  3. sakaran51

    Generator Circuit Breakers for smaller machines

    Hi, According to IEEE Std.C37.013a-2007 for Generators ranging from 10-100MVA, MV/HV Generator Circuit Breakers(GCB)are recommended as against normal distribution circuit breakers used in industrial, commercial and utility systems.The GCBs have special features suitable for -high X/R ratio of...
  4. sakaran51

    Frequency conversion for Steam Turbine Generator

    Hi, A Steam Turbine Generator has been shifted from one country to another country.The generator name plate details are as follows: Capacity:3150 kVA/2520kW; PF 0.8; Gen.volts 450V; RPM 1800; HZ 60;Poles 4;PH 3; Brushless excitation with exciter mounted on the same shaft extension. This steam...
  5. sakaran51

    Overload capacity of Generator

    Hi everyone, I would like to know whether the overload capacity of the generator is considered while sizing the Diesel Engine Generator by the DG manufacturers in their software programs. As per IEC standard, generator shall be capable of withstanding 1.5 times the full load current for 30...
  6. sakaran51

    CT saturation VS Numerical relays

    I have come across an article by one of the relay manufacturer that their numerical relay is unaffected by the CT saturation for any through fault.It can detect the saturation and prevent the malfunctioning of the relay,so they claim. Any comments? Moreover,are the special type PS/X Class CTs...
  7. sakaran51

    PS Class CT Knee point voltage.

    Hi, The CT requirements for the electrical system are to be specified in the initial detail engineering stage itself for any project.For differential protection for equipment like Generator,Transformer,Bus etc.,the required knee point voltage based on system fault current and relay manufacturer...
  8. sakaran51

    Load control of Generators

    Hi, A process plant fed by the Utility is having their own captive Diesel Generator sets as a back up.Now the management has decided to set up a coal based Steam turbine Power plant for the process plant captive usage.The STG is a condensing turbine from which steam required for process will...
  9. sakaran51

    Transformer charging with Generator

    Hi, Can anyone throw some light on the long term impact on the generator,energizing the transformer? A 5 MVA 33/11kV Transformer needs to be charged with a 10MVA,11kV Steam Turbine Generator.Is there any thumb rule for Generator-Transformer charging?
  10. sakaran51

    Transformer inrush and Generators

    Hello Everyone, What will be the limit of a transformer capacity one can safely switch on to a generator?In many of the schemes prevailing in industries,it is not possible to start the generator with transformer circuit breaker closed like a single unit.And the transformer switching on generator...
  11. sakaran51

    Short time rating of Generator NGTR

    Hi, What is the recommended short time duty of Generator Neutral Grounding Transformer and its loading resistor? Is it for 10 seconds,30 sec,1 min or 5 minutes? Is there any standard?
  12. sakaran51

    Generators and furnaces

    Hi, I would like to know whether the induction furnace and ladle furnace loads be connected and operated on a battery of Diesel Generators without any adverse effects.The scenario is this. 2*7MW Induction Furnaces are driven by two nos phase shifting transformers cum converter and inverter...
  13. sakaran51

    Modes of operation of STGs located apart.

    Hi,Everybody, Here is an interesting situation,but real! There are two steam turbine generators in two steel plants located two kilometers apart.Plant-A is existing. Plant-B under erection. Plant-A -STG capacity 15MW 11KV- Type of boiler AFBC and WHRB-Connected to 132KV grid through a Generator...
  14. sakaran51

    Back charging of Power transformer

    Hi,everybody, I am new entrant to this Eng-tips forum and hope to have an enjoyable company of friends, sharing and learning. Can anyone clarify whether a 2500 KVA Dyn11 6.3/0.433 KV,Z=6.25% transformer be back charged safely from LV side by a 1250 KVA Diesel generator? The x"d of generator is...

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