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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. GQuigley67

    Fed up With this ...

    this summer is killing me, not enough work... customers going for cheapest quotes... and the icing on the cake is my van being written off while it was parked on street and being offered a crappy pay out!! Close to packing it in and going to get a job for someone else seriously not loving...
  2. J

    Positioning Heat Sink Radiator on a Gravity Fed System

    Hi - I am putting in a new multifuel boiler stove (max 9.6kw to water), connected up to my vented thermal store, which I am looking to do on 100% gravity. The pipework runs 2m vertically from the stove, 2x45 degree bends, then a 7m horizontal run (with a very slight incline), another 2x45 degree...
  3. A

    Please Help! Overflowing Gravity Fed System

    Hi All, I am not a plumber, but a fairly competant DIYer. I am having a problem with an old gravity fed hot watre system and am tearing my hair out trying to figure out what could be causing the problem. So, what appears to be happening is the Larger tank in the loft fills until it lifts the...
  4. T

    Advice needed reg Gravity fed system

    Hi guys First post so bear with me please. I'm seeking advice regarding the central heating in a home I have just bought, it's a first home and this is my first experience of heating systems. The house is in a rural area and uses a Worcester oil fired boiler, so far from what I can see with...
  5. 7

    Removing airlock in gravity fed pumped power shower

    Need to remove airlock from gravity fed cold and hot water fed pumped power shower. Is it ok to connect a hose to a mains tap and attach to mixer hose outlet and force mains water up through the cold side into c/w storage tank & repeat by switching mixer to hot? Is it fine to send mains water...
  6. K

    Conversion of gravity fed HW to Y-plan, in North Wales, anyone?

    Currently, the hot water is scolding hot because the room thermostat is set so high. The only control over the HW is via the boiler thermostat, which is insufficient. If a cylinder stat were fitted and the pipework converted to a standard Y-plan system, that ought to fix it. For the time being...
  7. F

    pump advice for a gravity fed system

    Hi all, Please can i have some expert advice. I have a gravity fed system and i've just bought a lovely mira digital low pressure shower system that comes with a pump specifically for gravity fed systems. This pump will just provide pumped water to the shower. As i'm also in the process of...
  8. H

    Gravity Fed System - upgrade to Combi/ High Pressure System

    I currently have a gravity feed system. In the very near future I am adding a loft extension to my property so the 2 cold water tanks in my London roof will have to be removed. I seek a plumbing/engineer to visit my property to give me advice and possible options in upgrading my existing...
  9. K

    Rads fed with manifold

    Hello, I am thinking of feeding all rads on the ground floor through manifold and parallel connection. - Manifold will get supply from 22mm pipes - Hep2O/Speedfit 15mm pipes from manifold will run in continuous length (under the screeded floor) to each radiator - Return 15mm pipe from each rad...
  10. W

    Best WC inlet valve for low pressure tank fed supply?

    Fluidmaster are normally by go-to but noticed they can struggle on gravity feeds. Is there anything decent that performs better?
  11. K

    Gravity Fed Hot Water System

    Hi all, Hope this is in the right section but I have a question about my baxi Bermuda back boiler gravity Fed system. Could anybody tell me why when I have just the hot water on the upstairs radiators are always on? It also does this if the heating is on but below the temp on the...
  12. M

    Big house, big job: mains off booster pump or gravity fed?

    Okay so you may have seen my previous post regards to this but I'll just enlighten again. Now I've never installed anything this big and just got my commercial ticket so bare with me. If I sound a bit amateur rest assured I will not start job till I'm 100% confident. Got a 8 bedroom house...
  13. J

    heating and dhw fed off one tank???

    Anyone come across this? I've been to three jobs in the last 4 weeks where a coil type (NOT PRIMATIC) cylinder has had both heating and hot water fed from the same single tank. I'm guessing most plumbers of yesteryear would know better than to do this, builders maybe?
  14. M

    No Hot Water - Gravity Fed System

    The system : S plan with the hot water cylinder in the loft and the F&E tank about two feet (max) above the cylinder. The cold feed from the F&E tank and the cylinder flow/return disappear into the eaves of the roof (inaccessible), run down some boxwork in the first floor hall and then...
  15. E

    Portable gravity fed water heating system?

    Hello All I would like to open a hair shop in a area which has no utilities i’e water/electricity etc. (think middle of a field) I need a solution for the hair washing situation. In my mind i’m thinking the solution is having a portable water container which I can fill up and bring from home...
  16. J

    Water being back fed from immersion tank to cold water storage

    HELP!Can anyone please advise? I've exhausted my knowledge and am going mad!! I have a cold water tank that overflows once a day, really quickly. It seems that the warm water is being pushed back into the cold storage tank from the indirect cylinder. the heating system is a sealed pressurised...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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