Guineafowl's latest activity
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Yes, in all three systems the neutral/PEN is earthed at the transformer end.
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.I’d say you might be on a TT or TN-C-S system (see below), so in that case, no, but we can’t be sure yet. I also can’t yet explain your...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Here’s a interesting document about socket testers...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.That sounds like TN-S earthing. Max external earth fault loop impedance reading (Ze) is 0.8##\Omega##. I’d certainly call someone in to...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.A temptation to discuss the seemingly complicated US electrical distribution system… But no, I won’t ;) I assume there would be no 60°...
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GGuineafowl reacted to Averagesupernova's post in the thread Digital phase converters for running 3-phase motors with
Like.
This is what is known as open delta. Look around in small industrial neighborhoods in North America. You will see a large transformer... -
GGuineafowl reacted to Baluncore's post in the thread Digital phase converters for running 3-phase motors with Like.
Yes.
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.Yes, same here in the UK - real 415V/240V is deemed within tolerance of the nominal 400V/230V. Star-delta starting, over here, is...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.They’re all peak voltages, which seems to work: Using geometry, the distance D of each vertex of the delta to its centre, ie ##V_R...
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GGuineafowl reacted to Baluncore's post in the thread Digital phase converters for running 3-phase motors with Like.
Your diagram is correct, but the voltages are confusing because you do not indicate if a voltage is Vrms or Vpk, so it is hard to...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.That’s very clever. I’m trying to understand the circuit in terms of two sinusoidal voltage sources, VRY and VBY. Both are of magnitude...
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GGuineafowl reacted to Baluncore's post in the thread Digital phase converters for running 3-phase motors with Like.
This is one way to convert a single phase, active with neutral, into three-phase lines with 120° separation. The neutral becomes the...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.Thanks, the phasor explanation makes sense. The terminology is confusing, but here is an example device...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.As far as I can find out, the ‘digital’ refers to the PWM switching of the third leg. Say we were to scope the star/wye secondary of a...
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GGuineafowl replied to the thread Digital phase converters for running 3-phase motors.No, that’s a VFD.
