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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

    Pressure problems.. Gravity fed system.

    Hi, I am very inexperienced at plumbing but I am having a real problem with low pressure in my upstairs bathroom. The problem only affects the cold water taps for some reason, the hot water is fine. The problem first appeared about a year ago when we had the bathroom redone, the cold water...
    • Jreucassel
    • Thread
    • fed flush gravity gravity fed system pressure problem problems system water
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board
  2. D

    tank fed cold combi pressure hot to a triton pumped shower

    hello could anyone give me any advice. I went to a job before with a leaking triton electric pumped shower with cold water fed from a tank in the loft and a new combi feeding the hot. The shower is for low pressure fed so should I get a new shower or get the same one again.
    • danny_090
    • Thread
    • cold combi electric fed hot pressure pump pumped pumped shower should shower tank triton
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  3. W

    draining down gravity fed c/h system

    Hello. I'm a novice diy'er and need some help....I need to drain down my gravity fed system but not too sure how to do it. I know how to connect to the drain off valve on the lowest rad but not too sure of isolation or shutting off the water? Do I need to isolate both boiler and the...
  4. E

    Gravity fed system with no open vent?

    Hi all, just viewed a proposed boiler install heat only direct swap. The system is gravity fed but has no open vent? So I presume the water expands back into the cistern. Is this common?
  5. E

    Gravity fed combi

    I'm trying to figure out a problem for a guy with solar heating that connects through a cylinder and then to the DHW inlet at his combi. The warm water from the solar panel is a closed circuit which warms the water in the cylinder through a heat exchanger, the water in the cylinder is static, it...
  6. 1

    Bath with gravity fed hot

    Dear (ladies?) and gents, I'm due to help a friend install a new bathroom suite, and he has chosen a bath with tap holes on the long side of the bath, the side which sits against the far wall...My original thought for plumbing this ridiculous thing in was to buy some of those extra long...
  7. M

    converting a thomos dudley from mains pressure to tank fed?

    Well I don't know if I am just being really dumb but there was 2 of us having a go and could not work it out. It seems the fill valve is just 1 piece. When you take the diaphragm out you cannot get to the seating as it is all one piece. Or are we just being daft
  8. M

    trianco oil fired external (with cylinder in attic) gravity fed system

    i am on a job where the radiators down stairs are heating good but the 3 upstairs rads have no heat whatsoever, the boiler is outside at back door of house and is working perfectly,pump sounds great and set at 3, radiators are full of water upstairs yet no heat apart from at one which has tiny...
    • markmonty
    • Thread
    • attic cylinder external fed fired gravity gravity fed system oil other radiators sounds suggestions system trianco upstairs
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  9. M

    Water temp for gravity fed shower from boiler and immersion different

    Hi looking for some advice regarding my shower, it gravity fed and run with a pump. When the water is heated using the immersion tank the shower mixer gives hot water. When the water is heated by the boiler the shower is luke warm, even though the water run from a tap is hot. I've replaced...
  10. P

    Shower Pump - tank fed hot - mains fed cold

    Hi, I hope this lot makes sense, A customer of mine has two bathrooms next to each other. I need to fit a shower pump 2.0 bar to supply two showers one in each bathroom. The issue is that the first shower is a tray only( no bath) in bathroom 1 and is a standard Mira mixer unit with hot and cold...
  11. J

    gravity fed system queries.

    Hi, I was called to a customers premises today to quote for a replacement boiler and upgrade of system. The customer has a back boiler (baxi bermuda) and i believe it is fed by gravity.I am not familiar with this type of system so i just wanted to check are gravity systems usually one pipe...
  12. M

    combi fed by feed tank?

    I went to a house to install a bathroom ans reposition towel rail and so drain it down only to discover it is fd by an f&e tank. Which is about a ft above upstairs radiators. The installer even changed the rads so that would be the case. Wow what a mission to bleed the system. The boiler prefers...
  13. P

    Boiler for Gravity fed System?

    Hi guys can you get a boiler that will work on a gravity fed system or are they no longer available? i know most are pump fed systems nowadays but the customers budget it tight, Thanks guys
  14. W

    Problems with gravity fed solid fuel

    Hi all, im new to these forums to bear with me and i hope someone can help. We have a solid fuel system with a 13kw stove, It does the heating and hot water. Downstairs rads are on a pump with high and low limit stats on the cylinder. Upstairs rads are gravity fed. At present only two rads...
  15. S

    Fed up, tired and bored.

    Its getting colder, darker and I don't like it. Work is tedious, usual crap, jobs taking longer than you think, more complicated than first thought, usual plumbing sagas blah blah blah. I've been very busy but this week has been a bit slow, which I don't mind because I needed the rest, I am...
  16. P

    Help wanted - single tap mixer with two different water sources - pump fed and mains

    In my new house build (South Africa) I am to have a rainwater re-harvesting system whereby it's pump fed from a tank to service the toilets, hot water system and garden. We will also be using Mains to service drinkable cold water to our bathrooms and kitchen basins. The problem we have here...
  17. S

    Gravity fed system wiring fault???

    Afternoon Plumber gurus. Have a rented property which has a gravity fed system in it. Been asked by tenant to sort a few problems with heating. 1. bleed a radiator (give me strength) the other is she cant have hot water without the heating on. (had house a year) I thought this would be a MZV...
    • stanna
    • Thread
    • fault fed gravity gravity fed system heating system water which wiring
    • Replies: 18
    • Forum: Plumbing Jobs | The Job-board
  18. S

    tank fed combi

    barn conversion.spring fed water is pumped up to two new tanks in loft/master bedroom.customer wants a bath in same room.bath taps will be above storage tanks.dont know if any mixer taps are to be fitted anywhere yet just sizing job up.know i cant use a shower pump down stream of a combi.problem...
  19. C

    Basin Mixer with Mains Cold and Gravity Fed Hot

    Hi Guys, I’m new to the forum and looking for a bit of advice, so please take it easy on me. I want to fit a mixer tap to a new bathroom basin, but I have mains fed cold water and gravity fed hot water. Providing I get a mixer tap suitable for low pressure will I get a decent performance from...
  20. cr0ft

    Fed up with sales calls.

    Time to turn the tables in what I think could be quite an interesting thread. From now on whenever a salesperson calls me selling me crap I'm going to publish their number on here. I would then encourage you all to call them trying to sell them plumbing/gas fitting services please. Just say'...
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