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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. K

    Todays fun

    Hi all, Just wondered how many people knew about performing an 'ambient air assessment'. I came across this with my engineer today, never heard anything about this in college. We had readings of between 80 and 150ppm every min, appliance was ID.
    • kyle
    • Thread
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    • Replies: 38
    • Forum: Plumbing Jobs | The Job-board
  2. D

    Combining Mains and gravity fed system

    Hi all, Is it possible (has anyone tried) to combine a gravity fed system (tank in attic) together with the mains. Basically by passing the tank though putting a non return valve on the outlet of the tank. This I hope will add the pressure of water up to the mains pressure without need...
    • davedemi
    • Thread
    • cold combi cylinder electric fed gravity gravity fed system hot hot water hot water cylinder mains mains water pressure noise pipe power pressure pump pumps system tank valve vent vessel water
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board
  3. L

    Rad Drain issue

    House 7 rads upstairs 7 downstairs. Cannot drain downstairs rads for some reason. All work as per normal, wanted to replace one rad for a larger but cannot simply replace as the rad valve broken, anyway thats besides the point, why can I not get the downstairs to bleed. I have opened all the...
    • Livvid
    • Thread
    • bleed boiler concrete drain fed hatch issue job kitchen leak pipes plug rad valve radiator radiators system toilet valve valves vent water work
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  4. N

    Lack of hot water pressure

    Hi, I have a major issue with my hot water pressure. The 2 showers cannot get enough hot water and struggle. The taps in the en-suite and bathroom reduce output when i run them. However, if I lower the shower head in the bathroom the feed seems to improve, and the tap in the en-suite reduces...
    • nevmac
    • Thread
    • bathroom boiler cold cold water cold water tank diy fed head hot hot water hot water pressure hotwater kitchen loft pipe pipes plumber pressure pump shower head showers tank taps toilet trade water water pressure work
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  5. A

    Hot water cylinder spec?

    Hi Folks, I've got a leaking cylinder. It is gravity fed. Do i need the heat exchanger to be 28mm?? If yes, are they easy to get hold off? I understand screwfix cylinders are for pump fed systems only - i assume this is becuase the heat exhchangers are narrower pipe? I'm still trying to find...
    • Andrew 03
    • Thread
    • 28mm air cheap cold cold water copper cylinder difficult fed gravity hot hot water hot water cylinder insulation leaking pipe pressure problem pump replacement water web
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  6. D

    whole year failed level 3 exam!?! (tech cert)

    WTF just found out that last years group all failed the exam, so my college has a 0% pass rate! From what i hear a lot of the questions in the exam were not in the revision books followed by the course. Surely all the questions would be in the Viper or Corgi?. I just dont understand how no one...
    • drips'n'shiz
    • Thread
    • corgi exam failed fed gas level plumbing problem text training whole work year
    • Replies: 21
    • Forum: Plumbing Jobs | The Job-board
  7. C

    water leak

    hello ive had a water leak at my house and ive been told by my insurance company that its a invalid claim, because they say its graduall. can someone answer me this question..... is it possible to have a leak and not notice until the leak gets bigger or bursts and causes damage . thanks...
    • chunky7123
    • Thread
    • ceiling central central heating cistern cold concrete damage fed heating hot insurance kitchen leak loft mains paint pipes tank toilet wall water water leak
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  8. M

    moving gravity fed hot water cylinder into attic

    pricing a job for moving a cylinder into an attic for a builder and they want to keep the old cylinder its a bit mad, i would as a plumber want to install a mains cylinder. now i just a a question what is the min distance between the cold water storage tank and the top of the hot water cylinder
    • mark_mc
    • Thread
    • attic cold cold water cold water storage cylinder fed gravity hot hot water hot water cylinder indirect install job jobs mains moving pipe plumber pressure pressurised pricing tank valve water water storage tank
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  9. E

    Radiators going cold

    Hi, I've recently had some building work done during which three new 'double radiator/double convector' were installed. There are four radiators downstairs altogether. When the heating is switched on all the radiators are hot, however, after a while two of the new radiators go cold and one...
    • egibberate
    • Thread
    • bleed building cold cold radiator cold water fed going heating hot job radiator radiators room stat system thermostatic thermostatic valves trv valves water work
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  10. B

    Airlock in primary hot water circuit/Power flushing old gravity fed indirect system

    Hi, I've got a very old Glow-worm 92/100 boiler which is gravity fed indirect (it must be 30-40 years old. Having had a leak from an old galvenised F&E tank for a year finally got around to replacing it (and not a moment too soon as it had gone literally paper thin). Refilled primary and no HW...
    • big_al
    • Thread
    • airlock bar bathroom blockage boiler cold cold water fed flushing glow-worm gravity hot hot water indirect leak old pipes plumbing primary pump radiator sludge system tank vent water
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  11. T

    Gravity Fed Hot Water & Heating Wiring Problem

    Hi All, Can Anyone help me with a wiring problem. I have a gravity fed hot water system with pumped central heating. Problem is no matter when the hot water on by itself the radiators are also on. My boiler is a potterton flamingo RS35-50 in the kitchen. The wiring is a complete hash of terminal...
    • trainspotter375
    • Thread
    • basin boiler central central heating system cold drayton fed flow gravity hot hot water hot water system kitchen local plumber potterton problem pump radiators system tank tap timer valve water wiring work
    • Replies: 24
    • Forum: Plumbing Jobs | The Job-board
  12. W

    Thermostatic Mixer Shower from Woodburner Fed Cylinder

    The situation is thus: Customer has changed LPG boiler to a woodburner. Fancy shower set-up in bathroom. Woodburner is obviously not set to heat the cylinder no higher than 65 degrees. Shower pump and mixer not designed to take water higher than 65 degrees. I need some device to mix the hot...
    • WHPES
    • Thread
    • bathroom boiler central heating system cold cylinder eco fed hose hot hot water mixer mixer shower mixer showers price problem pump shower shower pump showers solar supply thermostat thermostatic valve valves water woodburner work
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  13. N

    Gravity fed C/H

    I am just about to install a multifuel boiler stove to feed the central heating. I intend to utilize the existing 1" pipework from a recently removed back boiler that runs up to the hot water cylinder and TEE off for the rads with 1/1/4" down to 3/4" and finally 1/2". I could do with general...
    • nilbymetric
    • Thread
    • boiler central central heating system cylinder fed gravity high hot hot water hot water cylinder install pipe pipes plumbing pump supply system tee towel rail water work
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  14. C

    how to escape the plumbers trade

    does anyone have a red or blue pill like in the Matrix film lol i feel my pills are always headache tablets ;) role on weekend and its only monday!
  15. K

    Mixer tap on a gravity fed hot water system

    Hi all Just moved into a house and out of several things the wife complained about was that there were seperate taps for HOT and COLD in the bathroom sink. She wanted a MIXER instead and she gets what she wants. The basin HOT water tap is gravity fed but the mixer shower valve is pump fed...
    • ksareen
    • Thread
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    • Replies: 26
    • Forum: Plumbing Jobs | The Job-board
  16. B

    gravity fed low presure mixer shower?

    hi all :) i am fitting a mixer shower in a bathroom wich is fed from a cold water tank in the loft tho i want to know how much presure i will get out of the shower and will it be any good? the storage tank in loft is or will be about a 2 meters above the hight of the shower head.?
    • benny_headland
    • Thread
    • bar bathroom cold cold water cold water tank fed fitting gravity guide head high loft mains mixer mixer shower mixer showers pressure shower shower head showers tank water
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  17. B

    carrer advice needed! please advise!

    Hey all, Basically I’m 20 years old have a btec in construction and am currently doing a hnc in building service training to be a contracts manager. Yet I don’t think the office is for me! i would like to become a gas/ heating engineer but don’t know how i would become this without starting from...
    • b services t
    • Thread
    • advice advise apprenticeship boiler building central heating system cheap difficult fed fix funny gas gas engineer gas training job jobs needed nvq please plumber power qualification safe safety tee train training work
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board
  18. U

    Gas Safe website

    I have used the Gas Safe website only a couple of times since it was introduced. The main reason I dont use it is because I can never get passed the passwords, and I am completly fed up with getting a new one issued each time, but after some perseverance I am in,I am now trying to renew my...
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