MAJOR problem with supply...

[Silly Sausage]

dlt27, I suspect JD is referring to floating star points, get googling.

 

[Guest55]

dlt27, I suspect JD is referring to floating star points, get googling.

all kneel before the mighty instr. tech. !

;-)

 

[dlt27]

Ok Thanks very much. It's a shot in the dark, but are there any books that explain these sort of things.

 

[dlt27]

Just out of interest could western powers problems have caused this and would it be possible in any way for this to contribute to the fire.
JUST STARTING TO GOOGLE.

 

[Silly Sausage]

all kneel before the mighty instr. tech. !

;-)

Finally, some acknowledgement of my mightiness!!!

Instuments, just one of my many skills

 

[Guest55]

and i bet that avatar pic really is you as well , your holyness !

 

[Guest111]

Put simply if you lose the connection to the star point then you lose the neutral,so on a 3 phase system imagine you had a socket fed off red phase and neutral and another from yellow phase to neutral if you lost the main neutral then the neutral bar in the dis board effectively links the sockets on red and yellow phases,so instead of each socket getting 230v they end up getting 415v and bang goes anything thats connected to them.which is why when working on a 3 phase system you should NEVER remove a neutral link with the supply energized.

 

[dlt27]

I understand that but any phase to neutral is 240v So neutral isn't broken, but possibly failing.

 

[Knobhead]

If the OP wants to PM me I’ll go through the testing required. I’m not going in to it in open forum or until I’m satisfied he will be safe.

 

[GEOFF S]

Thos sound like a fault on one of the phases to earth, the fault being a high impedance earth fault. This in effect drops a voltage accross Rb of the Tx. Test to true earth with a large screwdriver.