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  1. gentech

    Suitable replacement for a Caterpillar DVR

    Catserveng, I am still active, a Navy Seabee. Shore based prime power production. 2 and 4 stroke diesels, 2500 kw, low and medium voltage. We train with the Army for prime power production and then go more in depth into medium voltage substations and isolated and grid tied multiple unit...
  2. gentech

    Suitable replacement for a Caterpillar DVR

    Thanks again. The PWM signal for the ADEM is in the easygen documentation, I appreciate the info on the interface with the VR6/AV63, and the feedback on the droop. Don't know if you can speak to this or not but I've noticed remarkable similarities between the subpan mounted easygen and the...
  3. gentech

    Suitable replacement for a Caterpillar DVR

    Thanks catserveng! I was hoping to get by with 0 droop when in single unit isolated too. My thought being that the easygen will control the voltage according to set point, PF will be what ever the bus dictates. Have you seen stability problems with something like this?
  4. gentech

    Suitable replacement for a Caterpillar DVR

    I am looking for a less complex analog replacement for a Cat DVR which drives a 450 kW SR4B alternator. I will be using a Woodward Easygen control and don't want/need the added complexity of the DVR. Does anyone have any recommendations? Thanks.
  5. gentech

    Transformer Impedance Mismatch in 3-Phase Transformer Bank

    The GE "Distribution Transformer Manual" (GET-2485T) lists the following conditions for paralleling single phase transformers: 1. Voltage ratings are identical. 2. Tap settings are identical. 3. Percent Z of one is between 92.5% and 107.5% of the other. 4. Frequency ratings are identical.
  6. gentech

    Directional Current Relay Trip

    This is my first experience with this type of relay and its application. When attempting to parallel two 2500 kVa 9kV/380 V transformers via low voltage bus ties the 67 on the incoming bus operates approximately 1 second following breaker closure. Each bus operates under load when not...
  7. gentech

    Generator issues

    This may seem silly. What do you mean by garbage burning. You mention bioler feed pumps so I assume steam as prime mover. If your fuel is methane from a landfill that could cause instability due to varying HHV of the off gassing.
  8. gentech

    Any Electrical MEP Consulting Engineers out there?

    Do you mean the Department of Defense Mobile Electric Power program? If so let me know. Perhaps your experience of a "political culture" at work is a reflection of your customer, the MEP organization.
  9. gentech

    I am in the process of investigatin

    V belts it is! This seems to be the consensus all around. Conversations with all the component manufacturers involved tend to lead toward the fact that cogged belts are not the best means of power transmission for this application. I am doing some reading on vibration to learn more. From what I...
  10. gentech

    I am in the process of investigatin

    You haven’t lived until you have witnessed an EMD take a 2MW block load. Hearing and feeling the turbo come off the gear train and spool up is almost better than ...I digress. overmod, This is not an EMD engine. We use remote radiators with electric motors to cool our EMD power plants. I have...
  11. gentech

    I am in the process of investigatin

    xr7755, To answer some of your questions: 16 cylinder 4 stroke engine RPM=1800, Fan RPM=900. The belts are synchronous (cogged ). The belts snap suddenly. The genset was built by a major manufacturer. The engine/alternator are standard pieces for this manufacturer, but the cooling system is a...
  12. gentech

    I am in the process of investigatin

    I am in the process of investigating a cooling system problem in a 2000 KW diesel generator set. The generator set consumes belts in less than 150 hours. I have found a few issues that are problematic(drive undersized, poor sheave mounting, sheave to small). I can't however get the fan curve or...
  13. gentech

    Transformer sizing for motor starting

    artym, The KVA required by the fan motor is well below the manufacturers published motor starting KVA rating. jbartos, My genset was production tested, and subsequently rated, to accept rated motor starting KVA with out dropping below .85p.u. voltage and returning to .97p.u. voltage...
  14. gentech

    Transformer sizing for motor starting

    Ramconsult, 1. Is the diesel generator isolated continuously or will it paralleled at a later time It will run as a single unit with an isolated load. It will parallel with other sets to an isolated load. It will parallel as a single unit and with other like sets to the grid. I must size the...
  15. gentech

    Certification For Technicians

    My organization is looking into third party certification for our Electric Power Generation Technicians and Substation Maintenance Technicians. Is anyone aware of any? What is your opinion of their people and their certification programs?
  16. gentech

    Transformer sizing for motor starting

    All, I found this excel application at GE's website. Click the link and then "Motor Voltage Drop". http://www.geindustrial.com/cwc/solutions?id=642&SMSESSION=NO
  17. gentech

    Transformer sizing for motor starting

    What may further complicate things is that this motor powers the engine cooling fan in a 2000KW diesel generator. Under black start conditions the generator voltage will rise to normal, energize the transformer and then start the fan motor. My assumption is that the time it takes the motor...
  18. gentech

    Transformer sizing for motor starting

    Thanks for the information eyeryone. I haven't sat down and went through the calculations yet, but plan to. The Red Book should prove helpful also. Thanks again!
  19. gentech

    Transformer sizing for motor starting

    What size transformer is necessary to full voltage start a 75 hp, 460v induction motor for a propeller fan? Must I use the motor nameplate locked rotor amps to size the transformer? The only load on this transformer is this motor.
  20. gentech

    Radiator Requirements For Diesel Engine

    I am in the process of investigating a cooling system problem in a 2000 KWe diesel generator set. The generator set consumes belts in less than 150 hours. I have found a few issues that are problematic(drive undersized, poor sheave mounting, sheave to small). I can't however get the fan curve or...

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