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  1. gokulkrish2

    MV Cable on the ground

    Hello All, I have a question regarding the regulations over using a Medium Voltage cable (4160V or 7200V) installed by just running above ground(Not direct buried or concrete) For our project of dewatering the pit(Yes we are a mining company) we are considering options to supply a barge which...
  2. gokulkrish2

    Switchgear Replacement Planning

    Hello All, We are planning to change our old lineup of switchgear to new Arc Flash switchgear next year shutdown at our company. The gear is already in order and in production. We hope that it will be ready by June which is when we have our next shutdown. Right now we have 12 days to complete...
  3. gokulkrish2

    Unbalanced loading effects

    Hello All, I have a problem with single phase loading on to a 22.9KV distribution line which i need some help on. Hope you guys can help me. My System Details: 20MVA 115KV(Wye grouned) - 6.9KV(Delta) transformer connected to a 6.9KV Switchgear will multiple CB's. One of the CB supplies to a...
  4. gokulkrish2

    Transfer Switch Heat Imbalance - 3rd time

    Hello All, Please see the attached photo of a transfer switch which is used in a portable conveyor system. This switch is used to supply power either from a 13.8KV/480 V transformer or a 480V Generator. The problem we have been having with this transfer switch is that it shows high temperature...
  5. gokulkrish2

    Baker Testing of Motors - Destructive or Non Destructive??

    I searched for this topic on this forum and did find some topics discussing this. But none answered me straight if Baker testing is destructive or non destructive. I do not have a problem with coil resistance test and Meg ohm test. I know they are not destructive as the voltage level do not...
  6. gokulkrish2

    15MW Steam Turbine Generator coupling Breakdown

    Hello Everyone, Hope everybody is doing great in this forum. I am right now working on a commissiong of a 15MW steam turbine generator and have some questions for you guys to answer I represent the customer who bought the generator unit. While we were commissioning this generator two weeks...
  7. gokulkrish2

    5000HP Compression Motor Starting Methods. Design Phase

    Hello All, We are in the process of designing an air compressor which uses a 5000HP Induction motor. The data about the motor is attached. This motor is proposed to be fed from a 15MVA - 69KV/4160V transformer which is inturn supplied from a 125MVA - 230KV/69KV transformer from the UTILITY...
  8. gokulkrish2

    Thermal overload relay - Back up or required?

    Hi everyone, This may be a dumb question but i have this doubt and want to clear it. All the motors in my site have a Cuttler hammer HMCP breaker feeding in series with a motor protection relay (like E3+ or 777) to the motor. Now my question is this Isnt the HMCP breaker capable of...
  9. gokulkrish2

    copper power line Vs Aluminium in a mining environment

    Hi all, We are a mining facility and have been using copper wire for our power lines till now. Our mines are going deep and we are forced to go to longer spans and more heights. This leads us to choose for steel poles instead of wood. Now, steel pole guys are saying that if we use aluminium...
  10. gokulkrish2

    Permitting process for Cogeneration facility

    Hi fellas, We are in the process for investigating a feasibility of a cogeneration facility. The process is a Sulphuric acid production plant which gives us a lot of heat, which in turn we intend to convert to steam and produce power. In relation to this i have a lot of questions. We are to...
  11. gokulkrish2

    Starting Reactors for Soft Starters due to cable length.

    Hi all, We are in the process of purchasing soft starters for our deep well pump motors. They are going to be from EATON Cutler hammer and are for 1000HP motors. (Actually they are 2 x 500HP motors working in tandem). EATON has recommended that we have to have starting reactors because of the...
  12. gokulkrish2

    Help on Noise Cancellation

    Hi All, We have a coaxial copper cable used to communication and interlocks running parallel to a 13.8KV power cable at a distance of 1/2 ft in between them. Problem our process engineers are telling is that they have a lot of noise and sometimes that trips the circuit. My question for you...
  13. gokulkrish2

    Protective Relay Testing - Insurance requirement

    Hi Everyone, I am working for a mining company and barely starting. We have quiet a handful of substation and a decent number of SEL microprocessor relays. Our insurer has advised that we have to do testing on those relays every 3 years. They recommend us for 1. Insulation Resistance Testing...
  14. gokulkrish2

    1000HP Deep Well Water Pump

    Hi All, We have a deep well water pump in our site and we have had more than 5 failures on it now. I am given the task of finding the root cause for the failures and give recommendations of what can be done to prevent future failures. Here is the Pump Information: 1000 Horse Power Centrilift...
  15. gokulkrish2

    Need to troubleshoot

    Hi all, This is the scenario We have Ice boxes(Ice King) which have ICE in them which our guys use for cooling thier water and gatorade. They have compressors inside them. These Ice boxes are connected through GFCI's. Now, we had problems with these Ice boxes, they would trip and all the ice...
  16. gokulkrish2

    Estimating Motor Life time depreciation at SF

    Hi Guys, Recession has hit us. So we are trying to run a 1000HP motor to its SF level. We are going to increase feed into the crusher and by pass the Multilin beyond the overload setting. Now, We know that we are going to reduce the life time of that motor. Is there a way that i can predict...
  17. gokulkrish2

    Basics of Soft start

    Hi all. I am in the process of getting known about soft starters. So, I thought it will be good to get some inputs from the experts. We have a SMC Flex Soft Starter. We use current limit Start. Now i want to know how the soft starter is able to reduce the current. Is is reducing the...
  18. gokulkrish2

    Falk Rexnord Fluid coupling. HFN1480

    Hi all, I am solving a prob which involves a fluid coupling. This is was i need to know about the fluid coupling. How much time does the fluid coupling provide as a delay before it couples the load to the motor. I know that it depends on the orifice size and also the angle of fluid fed into...
  19. gokulkrish2

    Multilin Standard Thermal Curve

    Hi all. I have a Question regarding the multilin 469 relays which we use for motor protection which protects a 1000HP motor which runs a Crusher. We do the installation of the multilin protection scheme through the standard way of putting in required input parameters it asks about the motor...
  20. gokulkrish2

    Induction motor modelling.

    Hi everyone. I need some help with modelling an induction motor. All i want to do is to get a model of an induction motor which can simulate the starting time(Time it takes to get to the full speed) with no load attached to it. I tried to use matlab simulink but there is a problem. I have the...

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