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delta

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  1. M

    How to on & off the dol or star delta motor with timer?

    Hey guys...... I am new to this forum. I looking for a solution since a week but i am not able to get it. I want to switch on & switch off the dol or star delta motor with timer (Please note: here i am not talking about a timer switch which is used to switch the motor from star to delta). I...
  2. Jim90

    Help with 3 phase star delta motor

    Hi, I've been sent on a job to investigate a fan not working correctly. After investigation found that the fan doesn't run in 'Auto' or 'High speed' and just shows 'trip' on the control panel. The fan will run in low speed. I've replaced the belts on the fan as they were frayed. Opened the...
  3. Pete999

    One more Star Delta video for those still learning and for those who have forgoten

  4. Simon-0116

    3ph star delta starter motor drawing high amps

    Star delta starter / motor problem. Starter starts runs as should on bench with no motor connected. Getting 230v to e on all 6 uvw 1s and uvw2. 415 u1 to v2 etc etc. But nothing 1 to 2s. As expected. When motor connected up. (Single speed) it takes 3a in start on all . Drops into run fine but...
  5. A

    Question regarding 400V three phase lighting connected in Delta, without Neutral.

    I am in the process of designing the electrical installation of a community centre, and have a question about the provision of three phase lighting for a large function room containing 18 36W LED fittings. All of the light fittings are to be switched simultaneously. Would it be possible to...
  6. K

    Star delta testing help needed

    Hi I need some help I haven't work on star delta motors since my 1st year apprenticeship. How do you test the motor from the panel i.e check that the windings are balanced? Any help much appreciated
  7. S

    Delta-Wye Transformers

    Hi Guys, I'm looking for some information or diagrams on Delta-Wye transformers. Most diagrams that I have got, give me information for 3 lines to a Delta configuration then on the secondary side you get the Star configuration. I am really happy with the above concept, I would like to...
  8. G

    Dd0

    Where would a Dd0 transformer be used in the UK? Or an IT supply outside of medical for that matter?
  9. T

    Star Delta motor into DOL starter?

    Hello everyone. I have a new star delta pump (7 core flying lead) that has to be made off into a DOL single contactor starter. Is this possible and does anyone know how?
  10. E

    20 Kva Magnetek Jefferson 60Hz 3 Phase, 460y/260 Dry type transformer

    Hi. Have back fed this transformer trying to achieve 400 volts from a 250 volt 50Hz 3 phase 20Kva diesel powered generator. Have linked the high voltage Delta connected side to include all the windings, and connected the generator to the star connected low voltage windings, leaving the neutral...
  11. UKMeterman

    HV phase lost, strange voltages on LV side

    Hi, Storme Katie dislodged one of the HV jumpers on the DNO 11 KV network, so the local 11KV 415 transformer was single phasing. I expected to get 240, or 120V but there were some people getting 150V and I got about 70 volts and it was indepenent of load. I am trying to work out why not 120V? Thanks
  12. C

    Star/ Delta Connections

    Hi guys, Anyone got any basic notes on star or delta connections that would help out to get my head around it and understand it a bit more haha. voltages, current and calculations? cheers
  13. Lee Gold

    Star and delta phase voltages

    I came across a question today in my paper asking me to draw out star connection and a delta connection and draw out phase voltages on star from phase to phase and write in the voltage and I don't understand it at all can somebody help please. Star carrying 240/400v delta 400v Sorry I'm not...
  14. I

    3 Phase presentation

    HiForum Thisall came about as I am looking to use a 3 phase motor with variablefrequency drive/VFD and started to get confused with 3 phasevoltage. MyVFD uses one phase and neutral on the input and presents 3 phases onthe output in Delta (no neutral). At first I though I could simulate400V 3...
  15. G

    Star delta fan wiring help please

    Hello there have been asked to fault find on a clients 3 phase star delta fain in a grain store. the client purchased the fan second hand and I have power across the contractors but no power on the out going side. no wiring diagrams either. Can anybody give me some in what to check for and...
  16. S

    Star/delta motor trips on Delta

    Hi, I have a 90KW 3phase electrical motor. It is set up on the star/delta configuration for high current start ups. The problem comes when I start the motor. It is fine in star but when it switches into delta it will trip. It won't trip every time and when it does stay on it will run fine. But...
  17. Tiny Spark

    A strange fault and a interesting days fault finding....

    Ive had a amusing days fault finding today, Found several faults but have come out of it asking more questions than I have answers. So Me and a colleague go to this AHU that keeps tripping for unknown reasons, The pannel has been canabalised and the inverter and motors covers are removed but...
  18. E

    Do RCCD's work in two phase systems

    Hi, I'm a newby hear and wonder if anyone can help me with this question. I work on a ship and our sockets are 2 phase 220volt instead of Live and Neutral 220volt, i.e we do not have a star point at our transformer. Our network voltage is 11KV / 440v Delta / Delta and then transformed down to...
  19. M

    Delta training/NU Training/ New Delta/Tom Harvey

    Hi guys, I was with delta doing my NVQ and tore recently a guy called TOM HARVEY contacted me and has continued my NVQ. Everything has been fine but now it's time to issue the cert, I just can't get hold of him. I've tried ringing his mobile left emails and voicemails but to no avail! Can an...
  20. P

    Star and delta questions

    Evening all, could do with a little bit of help with regards to star and delta calculations. I have 3 questions and have attempted them but I have a feeling I have got the delta part incorrect (haven't covered all calcs for that yet) I have posted the questions below and if any trained eyes...

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