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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. J

    Gravity Fed DHW with Pumped CH or fully pumped?

    Hello, I have a Thorn EMI boiler from the 80s and I was wondering if anyone could tell me if i have a gravity DHW and pumped CH, or fully pumped system? There is a valve on the system but i cant remember if its a 3 way or two way valve (i'm currently out of the country with work). Basically my...
  2. B

    Rad fed from above...

    My custard wants us to put a tall towel rail in his utility room. Single storey extension with a loft directly above. The new (oil) boiler is in the same room. Vented system. F&R go up from the boiler and along the loft. He wants the towel rail piped from above onto the top of the rad. I cant...
  3. A

    tank fed system boiler, vent and fed positioning?

    I have bin to take a look at a heating system thats heating the office part of a commercial building. Last year it had a boiler change, im not sure what was there before. What has been put in is an Intergas combi boiler, tank fed on the heating side, the hot water side is not connected. 1, Any...
  4. S

    Central heating system gravity or pump fed how to find out Newbie question

    Hi I am a industrial sparky by trade I can do the odd bit of plumbing but I have had a elderly person who lives near me ask me to check some work a handy man has done for her i popped round and he has changed the time clock for her from a Honeywell st1000 to a h27xl horsmann as she...
    • Sparksuk
    • Thread
    • central central heating fed find gravity heating heating system newbie pump question system
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  5. J

    Gravity fed radiator

    About 20 years ago I had a Rayburn coal fire back burner installed that fed radiators throughout the house. I believe as it's a coal fire, a gravity fed radiator was installed on the hot water supply to the spiral coil that's inside the hot water tank. I think this was in case excessive heat...
  6. A

    Fed up with my plumber! (sorry, this is a long rant)

    I've had a plumber working on my house renovation for a few months, I am paying him for the whole job. Its a company so the boss rarely shows up but sends lads round to do the work - occasionally! We have a deadline to be completed by December and have other trades on site. The fact that the...
  7. S

    ripping out an old gravity fed HW tank and fitting a thermal store?

    thanks for your time for reading this... ** The situation There's a reasonably good gas Baxi back boiler that gravity-feeds a very old hot water tank in an airing cupboard on the landing, header and expansion tanks directly above in the loft. Central heating controller is a Honeywell 7 day...
    • speculatrix
    • Thread
    • boiler fed fitting gravity old pressure store system tank thermal thermal store water
    • Replies: 16
    • Forum: Plumbing Jobs | The Job-board
  8. C

    twin immersion tank fed from solar pv diverter

    scratching my head a bit. ive got a plumber fitting a rm stelflow 250l with twin immersions. my idea is to feed the top one first then the bottom one once the top one has tripped its stat setting. the problem is most stats seem to have only normally closed contacts, I need normally open. one...
  9. R

    Gravity fed system.

    Hello I would like some information on a small job I'm doing for my mum. My mother has a gravity fed system with the bathroom and kitchen both on the ground floor where the hot water cylinder is also situated. There is central heating with radiators upstairs and down. There is also the cold...
  10. B

    Poor hot water pressure on gravity fed system

    Hi all. Got a job on and hw is gravity fed. Renewed bathroom but we had to take the hot into the basement and bring it back up into bathroom (couldn't avoid it really) and cylinder is in the attic but since doing so the pressure has worsened so much so that new mixer shower won't work. Would...
    • Bhoydavid
    • Thread
    • fed gravity gravity fed system hot hot water hot water pressure pressure system water water pressure
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  11. V

    Luis Suarez Not Properly Fed

    So he is up to his old tricks again, biting opponents? Why is he not properly fed? This will stop him trying to eat his opponents Luis Suarez bites AGAIN! CLOSE UP VIDEO - Suarez bites Chelsea's Branislav Ivanovic - YouTube
  12. N

    drop fed radiators not being drained down

    I have been asked by my landlord to clean my (his) central heating system in our rented bungalow. I thought, OK, I just need to drain it down, add the cleaner, leave for the recommended time, fill and drain a few times. But I tried to drain it once and found that some radiators are fed from...
    • Nobbyone
    • Thread
    • being drain drained drop fed property radiator radiators their valve
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  13. M

    Cold tap - Fed from hot water header

    Hi - I discovered recently that the cold feed to the shower / sink in my on suite plus the toilet are fed directly from the header tank that also feeds the hot water tank. This sounds wrong to me expecting that it should be fed directly from the cold mains. The rest of the house the cold...
  14. W

    Kitchen tap suitable for "gravity fed systems only"

    Swirl Divine Mono Mixer Kitchen Tap | Kitchen Mixer Taps | NoLinkingToThis Presumably this can't mean tank cold too as it's a kitchen tap. Anyone come across a tap that says that before? Perhaps the hot side is made in such a way that it would be an uncontrollable jet if put on mains hot from a...
  15. Z

    Gravity fed hw system

    I have little experience on these old systems. A mates bought a house with the setup shown. Had a quick look today, heating on boiler and pump fires rads heat up. Hw only pump goes off boiler cycles, flow gets red hot returns cold. Any ideas?
  16. B

    Tank fed water to handbasin

    Hello all , My daughters house has a tank fed cold supply to the hand basin in bathroom ! stateing the obvious but she should avoid cleaning her teeth in the bathroom i guess , seems strange because thats where you expect to clean teeth. Is this quite a common practice ! Cheers Mark
  17. S

    So fed up with ignorant customers

    Had a voicemail Xmas day. Fitted a boiler a boiler a month ago. Customer says that the radiators don't seen to be turning off. she has trv's on all the rads and an off switch on the boiler! Does she really need to phone me Xmas day for that! It's probably a user error anyway. Fuming when I...
  18. P

    Gravity Fed Air In System

    Hi All, I've just added four new radiators to a property. System: conventional heating system Conventional Potterton Suprima boiler I've bleed the air from the radiators correctly, starting at the bottom then upstairs. All the radiators seem to be getting hot, but the boiler seems switch on...
  19. M

    Replacing gravity fed system in flat with no gas. Help me please

    Hi, I am renovating my apartment, so new kitchen and bathroom, but have really bad hot water. I am running an electric gravity fed system at the moment as i have no gas, but pressure is terrible as i have a flat roof and tank is in the airing cupboard, only at head height. It is ok for the...
    • Muzzafish
    • Thread
    • fed flat gas gravity gravity fed system help please pressure replacing shower system water
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  20. J

    Combi boilers tank fed

    Came across a few today on an estate, had no p.r.v on them going to outside. I at risked it, but then went across the road an came across the same ? I noticed I could see hardly any blow off pipework on houses, got in the loft an it still fed off the tank ?? what would you do in this...
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