A "'severity factor "'is established as a coefficient to assess the dielectric severity supported by a transformer winding considering the incoming transient overvoltage ( voltage spike ).
22.
Severity factors are a newly concept for analyzing the dielectric severity supported along transformer windings when a transformer is submitted to a non-standardized transient voltage waveform induced from the power system.
23.
Low frequency oscillations like motorboating indicate that some device or circuit with a large time constant is involved, such as the interstage coupling capacitors or transformers, or the filter capacitors and supply transformer winding.
24.
An additional transformer winding supplies 600-800 kW at 1520V for head end power ( heating ), there are also 150 kW, 380V, 50 Hz and 15 kW, 110V DC auxiliary supplies.
25.
Using isolation transformers, which were bulky and expensive, in miniaturized circuits to separate the driving source and the switch element resulted in magnetic pick-up and spike feed-through due to the transformer winding capacitance.
26.
The peak current is set in principle by the rate of rise of the supply voltage on the rising edge of the incoming sine-wave, but in practice it is reduced by the resistance of the transformer windings.
27.
The "'TDSF "'gives further detailed information on the severity supported by the transformer windings due to the transient event coming from the power system, regarding to the internal transient response due to dielectric tests in the time domain.
28.
As the anodes of each AC phase are fed from opposite ends of the centre tapped transformer winding, one will always be positive with respect to the center tap and both halves of the AC Waveform will cause current to flow in one direction only through the load.
29.
If the mechanical regulator design is sensitive to small voltage fluctuations, the motion of the solenoid core can be used to move a selector switch across a range of resistances or transformer windings to gradually step the output voltage up or down, or to rotate the position of a moving-coil AC regulator.
30.
In European nomenclature a first letter " E " identifies tubes with heaters to be connected in parallel to a transformer winding of 6.3V; " U " identifies tubes with heaters to be connected in series across the mains supply, drawing 100 mA; and " P " identifies similar 300 mA series-connected tubes.
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