I´ve made a second test of the big magnifier.
The magnifier is now driven by a 8Mot stack (16kV)and
an ASRG (2950min-1 0,315"copper-tungsten Elektrodes at 11,4" diam.)
I´ve testet a new method of ballasting:
I used a phase controller with current regulator to adjust current.
The phase is cuted by an device called powerblock which consists of
two powerthyristors in one block for antiparallel use.
I can use the controller without the regulator instead of a variac.
With regulator i can regulate the current to the desired level.
This works,and weight much less! than a power variac and a ind.ballast.
With the big powerblocks you can handle around 300A and the
max rev.Voltage up to 1600V.
(with cooling radiator and fan aound 60lbs.for 300A)
The use of an RC-safetynetwork prevents the
thyristors from overvoltage.I use the 65A thyristors.
The real current (for the reulator)was measured with a current transformer.
The only problem,i have to make the regulator a little faster.
I´ve a link to this devices to our company and I use the older version
(AEG / powerblocks from eupec)of the ISR02.
Now my problems:
With the 8Mot Stack I have 6kV more voltage as with the Radartransformers in the first test.Now i´ve racing sparks again.
The isolation of each of the three PET plastics could withstand the 16kV AC.
i think my main problem is the height of the toroid C2 or the last
I tell you more,if the next tests resulted in disaster or performence.