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Doubly-fed electric machines also slip-ring generators are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines. DFIG-based wind turbines, because of their flexibility and ability to control active and reactive power, are almost the most interesting wind turbine technology.

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  1. E

    gravity fed upstairs shower pressure question

    We have a gravity fed hot water system in our the house we have just recently moved into. It works fine with the downstairs shower, however we are about to upgrade the upstairs bathroom and are considering installing a shower bath. My concern is that although there is more than sufficient...
  2. S

    Possible Leaking Gravity Fed Hot Water Cylinder Valve

    Hi all. This ‘valve’ is at the bottom of our domestic hot water cylinder. Anyone have any idea what it is please? It must’ve been there for many years and seems to be leaking.
  3. C

    Using combi fed and gravity fed showers simultaneously

    Hi all, I have a combi boiler for hot water and heating but have 2 showers in the house. Obviously low water pressure if both showers are used at same time. I'm wondering if I could install a water tank to gravity feed one of the showers, with new electrric shower and if so how to stop the water...
  4. J

    Bath tap mains fed or from tank

    Hi guys I'm wanting to install an electric shower in my new property what's the easiest way to check it bath tap is coming from mains ? The mains stop tap is located near the toilet in the room underneath me, when I switch that off it shuts all cold water off for every tap in the house. If I...
  5. C

    Flats bathrooms fed by tank?

    Hi guys I did a job today in a block of flats, fairly old place, plumbing was all a bit ropey in this particular flat. The job was to change an electric shower over, I changed it, didn't work.. noticed the water pressure was a bit pants.. I could stop it with my finger on the basin.. thought...
  6. I

    Why is there a blue and a red float for a FOP on a gravity fed tank?

    I assumed that the red ball float was for a header tank on the central heating side and the blue ball float was on a cold water storage tank. I thought the reason for this was only to help identify the tank but after finding a lot of cold water storage tanks with a red float, I must be wrong...
  7. G

    Installing decent pressure shower on a gravity fed system

    We currently have an electric shower fed with mains cold this mains cold is really bad pressure coming into the shower resulting in really poor pressure from electric shower. We have a gravity fed system what's the best and cheapest way to get a decent pressured shower fed from our gravity fed...
  8. L

    How can i turn my standard gravity loft fed system

    Trying to get a high pressure shower running off a gravity fed system
  9. D

    Gravity or mains fed shower?

    I’m replacing my faulty old mains fed electric shower (Mira Sport Max 10.8kW) and am considering going for a pumped, gravity fed electric shower (such as the Mira Elite SE Dual Pumped Electric Shower 9.8kW). The mains pressure sometimes drops enough for the low-flow cut-out to operate or the...
  10. E

    How can I get heat into Gravity Fed UFH system

    Hi folks, I’m in need of some sound advice. We have recently had a ground floor extension and have had underfloor heating (company: JK UFH) installed throughout most of the downstairs. We have a few rads still left downstairs and the entire upstairs is still heated through rads. We have a...
  11. P

    Black tank fed shower

    Have tried everywhere to find a black gravity fed shower. Can anybody please help?
    • Patrick2019
    • Thread
    • america black fed shower tank usa
    • Replies: 1
    • Forum: USA
  12. 4

    I want to convert my sons Mains fed Shower to a Pump fed Shower.

    My son has a Shower Room in his long Cottage that is fed by Mains cold water, the hot water is supplied by a local Powerstream Heater. The problem is that when the cold water is used at the other end of the cottage, the cold water pressure drops and the Powerstream low flow cut-out operates and...
  13. I

    Advice needed. Converting gravity fed cold supply to mains fed to supply an electric shower?

    I want to put in an electric shower in my downstairs cloakroom which currently has a gravity fed cold supply from the tank in the loft. The shower I am looking to install needs a mains fed cold supply which I could do by disconnecting this pipework from the gravity tank and connecting the cold...
    • Ian1706
    • Thread
    • advice america cold electric electric shower fed gravity mains needed shower supply usa
    • Replies: 13
    • Forum: USA
  14. M

    Installing 1800mm x 600mm radiator fed from above

    Hi everyone, I want to fit a tall rad in my bathroom which will be fed from above, but I would like to keep the pipework to a minimum. Is it necessary to run both pipes to the bottom of the rad, flow to the bottom and return to the top, or will it work with both to the top? I'm not sure as yet...
  15. M

    Install a tall 1800mm x 600mm rad in my bathroom fed from above.

    Hi everyone, apologies if this is a dumb question. I want to fit a tall rad in my bathroom which will be fed from above, but I would like to keep the pipework to a minimum. Is it necessary to run both pipes to the bottom of the rad, flow to the bottom and return to the top, or will it work with...
    • MalcyT
    • Thread
    • 600mm above america bathroom fed install rad usa
    • Replies: 2
    • Forum: USA
  16. N

    Gravity Fed Rain Shower

    HI, Looking for some guidance on buying and fitting the right products. I currently have a gravity fed system with a cold water tank in the loft and a hot water cylinder in the airing cupboard on the first floor. The hot water flow throughout the house is not particularly brilliant, but sort...
  17. D

    Improve Gravity Fed Mixer Shower Pump Pressure?

    Hello All, I believe that some time ago I may have replaced the Shower Pump that stopped working after approximately 3 to 5 years or more with the wrong Shower Head Pump type. The Shower is Gravity Fed from the Cold Water Tank in the Loft above the Bathroom where the Hot Water Tank is within...
    • DC4_DIY
    • Thread
    • america fed gravity mixer mixer shower pressure pump shower shower pump usa
    • Replies: 3
    • Forum: USA
  18. B

    Advice Needed: Can I install gravity fed toilet, basin and shower in new en-suite location?

    Good morning all, -I would really appreciate your advice on whether it would be possible to have a gravity fed toilet, basin and shower installed in a my new layout upstairs? The detail: I currently own a two bed house (is actually a three bed on original plans) and want to covert it back to...
    • BettyP
    • Thread
    • advice america basin en-suite fed gravity gravity fed system install location macerator needed new pipe fitting shower toilet usa
    • Replies: 2
    • Forum: USA
  19. D

    Flush gravity fed F&E central heating system

    Forgive me is this is a stupid thought! I'm looking to flush dirty water out of an F&E system. Can I attached a hosepipe to the lowest drain off point and simply drain off water outside without turning off the water supply to the F&E tank? So my thinking is that it may take some time but...
    • daveok77
    • Thread
    • america central central heating central heating system fed flush gravity heating heating system system usa
    • Replies: 2
    • Forum: USA
  20. B

    Is it better to wire the pump independent of or fed from the boiler?

    It seems a simple question so I hope this is enough info to require only a simple answer for you guys to give. I have an existing installation which was recently upgraded with a new Worcester Greenstar 15Ri boiler. The system is small and is pretty standard open vented with a single zone...
    • Bordonbert
    • Thread
    • america better boiler fed independent pump usa wire
    • Replies: 4
    • Forum: USA
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