Body
Norm,
Thanks for that.
I love Mr Calrsons lab, I could happily live there for quite awhile with
all that awesome vintage gear. I have seen isolation transformers wired
like that and it's so insane but I am used to testing all the grounding
points. When building a recording studio we have to float all the
grounds so they are single point at the service panel and not looped
anywhere else. Often they are lifted at the outlet j-box due to the
lack of control in a prewired building. Ironically we also used to use
autoformers for all of the light dimmers to prevent noise, so we often
referred to the variacs as light dimmers.
I still don't completely trust a scope on an isolation transformer even
if the ground is properly isolated/ lifted due to the somewhat rare
magnetic emp events we are talking about like when I kicked off all my
ground faults in the house through one.
On 11/3/2018 2:03 PM, Norman Wootan [email protected] [EVGRAY] wrote:
>
>
> Mick! Here is a helpful video regarding scopes and isolation
> transformers on the test bench!
>
> https://www.youtube.com/watch?v=XBsQ3sZ45Fk&feature=youtu.be
>
> https://www.youtube.com/watch?v=xaELqAo4kkQ
>
>
> On 11/3/2018 12:36 PM, Mick [email protected] [EVGRAY] wrote:
>>
>>
>> Norm,
>>
>> Thanks for the nudge in the right direction. Now the process demands
>> repeating with a totally isolated battery source configured the same
>> way. Funny how I was concentrating on isolating and connecting
>> saturated inductive charge without the first magnetic variable taken
>> into account.
>>
>> I have had no problem creating the event with my grid power source
>> and even warned Sven that an isolation transformer will not always
>> protect his scope when messing around with this energy. My scope
>> probe sitting on a bench shot me in the leg when I walked by when
>> performing the experiments from my bench supply. The bench supply
>> has an isolation transformer of sorts. Being it is torroidal there is
>> more inter-winding capacitive coupling and mutual inductance than
>> with the proper EI transformer though there is at least the
>> electrostatic shield and galvanic isolation.
>>
>> Thanks for that reference. the Brit guy was funny, although I'm very
>> familiar with iso transformers in audio work used for galvanic
>> isolation and balancing to eliminate common mode noise.
>>
>>
>> On 11/3/2018 4:42 AM, Norman Wootan [email protected] [EVGRAY] wrote:
>>>
>>>
>>> Mick! Your DUH reference is funny! To understand Isolation,
>>> best to study and understand the Isolation Transformer. The super
>>> high quality ones are built to eliminate noise and DC components
>>> that effect sensitive instruments like EEG and EKG instruments. This
>>> will give you an idea as to construction and purpose::
>>>
>>> https://en.m.wikipedia.org/wiki/Isolation_transformer
>>>
>>> A little tutorial as to how they work!
>>>
>>> https://www.youtube.com/watch?v=sfzy5IQMzyc&feature=youtu.be
>>>
>>> https://www.youtube.com/watch?v=14kPQif9P7c&feature=youtu.be
>>>
>>> https://toroid.com/Products/Medical-Isolation-Transformers
>>>
>>> The 230VAC, 5 HP locked rotor experiment was an example of
>>> electrically isolated electrical circuitry when mains contactor was
>>> opened since there was no neutral involve. There is magnetic and
>>> capacitive coup[ling only The dielectric insulation was not
>>> compromised therefore no electrical connection. The Chinese motor
>>> experiment was isolated, (electrically) when the reversing action
>>> was in transient. (Floating neutral) since there is a line neutral
>>> in the 120VAC input.
>>>
>>>
>>> On 11/2/2018 2:44 PM, Mick [email protected] [EVGRAY] wrote:
>>>>
>>>>
>>>> Norm,
>>>>
>>>> Since you have performed mass research on this event would you concur
>>>> with my long distance observation that the event is not only due to
>>>> charge isolation but inclusive of a magnetic connection from source in
>>>> addition to the saturated and lifted inductive load?
>>>>
>>>> Your bell buzzer and bell transformer acting as an isolation
>>>> transformer.
>>>>
>>>> Both motor experiments, the small Emerson type and the HVAC unit with
>>>> only two hot's no neutral, must have been powered by an isolation
>>>> transformer of some type also such as the utility step down for the
>>>> neighborhood or dedicated delta or wye for commercial or even acted as
>>>> such from the dual windings of the HVAC motor.
>>>>
>>>> Have you reliably produced the NS from any type of isolated battery
>>>> system, or in all such cases was there a magnetic connection to an
>>>> earth
>>>> bonding in another spot?
>>>>
>>>> My thoughts being one side of a transformer acting as a source is
>>>> grounded and the secondary side isolated so that the only conceivable
>>>> ground bonding on the sink might be considered as magnetic aside from
>>>> the bonded motor frame or what not producing the reconnection.
>>>>
>>>> I may be pissing up a rope notwithstanding the NS seems to be
>>>> predicated
>>>> on a B field connection somewhere in the source feed though the neutral
>>>> is isolated electrically.
>>>>
>>>> Perhaps this is a simple "Duh" to you that you had already figured out
>>>> assuming everyone else at least this smart. Either way it does create
>>>> an interesting position in which to view 3 phase and transformers with
>>>> an extra resonant winding.
>>>>
>>>> By the way, ironic your implication that the large medical isolation
>>>> transformers create a heretofore unknown vector of extreme danger.
>>>>
>>>> Mick
>>>>
>>>
>>
>
>