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  1. LionelHutz

    How to protect against frequent breakdown of soft starters at a water pumping station?

    Give details on the soft-starter failures? FYI, any good soft-starter will protect against a phase loss or phase unbalance without extra external equipment.
  2. LionelHutz

    How to test short in alternator rotor winding inside the slots?

    You can apply AC voltage to the rotor and then measure the voltage on each coil/pole and compare. I don't know how much difference indicates a bad pole, but I know this is a test that sites with a lot of synchronous motors use to determine when a motor has rotor issues.
  3. LionelHutz

    Air India 787 crashes on take off

    I can't see the plane being built so a power loss kills the engines when the engines are built to continue functioning through most plane electrical system issues. Also, it's be dumb to build a plane that kills the engines between a power loss and the RAT deploying.
  4. LionelHutz

    Air India 787 crashes on take off

    Vapor lock was the dumbest theory I've heard so far. The 787 flight software tries to correct for yaw on single engine failure. So, a single engine failing before lift off might not cause an obvious yaw. A theory that would make more sense was an engine failed somewhere around the V1 point and...
  5. LionelHutz

    Tesla Cybertruck fire and alleged design flaw. . .

    Putting the manual release behind a panel is complete stupidity. Other cars do have electric door latches. Later model Corvettes do. The manual release is a pull-up lever between the seat and door, one on each side. Easy to reach and pull as long as you were shown it's there.
  6. LionelHutz

    Directly from 30 kV to 0.4 kV? Or step down the voltage in stages, typically from 30 kV to 6 kV, then from 6 kV to 0.4 kV.

    The building I'm sitting in has a 44kV to 600V transformer sitting beside it. The common way to step down voltage is using what's necessary for the application.
  7. LionelHutz

    Turning houses into boats...???

    A self proclaimed troll, so yes have made the correct conclusion. Use the block user and you don't have to see any further BS from that user.
  8. LionelHutz

    Two 250 VDC 1200A rectifiers feeding multiple crane rails - is it OK to put the outputs in parallel ?

    If you feed from each end of a physically long bus and the rectifiers are tapped/adjusted to have similar output voltages then they might not share per say, but the rectifier at each end could supply the loads at that end of the bus by virtue of the bus resistance forcing that rectifier to take...
  9. LionelHutz

    Transformer Step Down 4160/600, Start-Delta Ground Issues

    The wye point of the 208/120V transformer is likely not grounded and one of the three lines might currently have a ground fault.
  10. LionelHutz

    Honda Recall - 3.5L main bearing problems

    Don't be ridiculous. If every single unit of an engine type can't make it 300k miles without an issues then it deserves to be ranted about. Same with any engine that uses a component or design that is personally deemed as being "stupid".
  11. LionelHutz

    Things are getting better part 2

    With that plane, roll could be a passenger issue. More distance from the center line means passengers are moved up and down more when the plane rolls. I thought there was something about that being more likely to cause motion sickness.
  12. LionelHutz

    Can IC Engine Compression Testing with/without Blanks on Inlet and Exhaust Manifolds Quantify Valve Leakage?

    No, your proposed tests are useless. Apply compressed air and listen for a leak at each port. Or, if it's on a stand then you could rotate it until the intake or exhaust ports are up and then put some mineral spirits into each port and see if any leaks into the combustion chamber. Rotate the...
  13. LionelHutz

    Air Traffic control failures

    It wouldn't surprise me if Trump via Musk will try to push some kind of combined xAI and Tesla technology thing into an automated ATC system,
  14. LionelHutz

    Star delta

    The star-delta starter only makes sense if it is the only starting method. A VFD will draw even less line current than a star connected motor directly connected to line power. The VFD will even draw less line current than the motor draws connected on the VFD output while the motor is...
  15. LionelHutz

    Spain and Portugal power grid collapse

    They'd probably need a synchronous condenser to have a lot of added inertia if they want it to provide significant help with grid stability,
  16. LionelHutz

    AA jet and Military helicopter collide over Potomac

    Hold for the "wrong" plane vs pass behind the "wrong" plane makes no difference in the outcome because the helicopter would have still proceeded forward enough to be in the path of the plane that hit it. Good job though continuing your role of being the proper word use police, and also posting...
  17. LionelHutz

    AA jet and Military helicopter collide over Potomac

    You mean actually doing like she was told to do, when told to pass behind the plane? Because she was directed to pass behind the plane, meaning she needed to wait for it to cross in front of her. You really like posting in circles, circles, circles.
  18. LionelHutz

    AA jet and Military helicopter collide over Potomac

    Hold where exactly? Short of the path of the wrong plane she was watching? How does the pilot be precise about their "hold" position when hurtling through a dark night sky?
  19. LionelHutz

    Excitation current on induction motor as a generator via VFD

    Exciting current for the motor comes from the DC bus. Never from the AC source. The input on the AC source is only the real power to rotate the motor. The post edison123 made isn't even that dramatic a difference. I've seen it much larger when spinning an unloaded motor on a VFD. The big...
  20. LionelHutz

    120/240V 1P-3W, 100A Service to Very Remote Building

    Around here, it's common for the rural customers to put in their own poles and overhead line for the utility to feed directly off the power line at the road. I believe the transformer can either be leased or purchased, but it's possible the utility provides it on the customer pole instead of at...

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