Field descriptions for TRAFO7 Excel spreadsheet ...

Field	Type	Description
Ud	Input	Si diode voltage at high current (change this voltage for using valve (tube) rectifiers, or special diodes)
Ubrss	Input	max. allowed typical peak-peak ripple voltage
Ia	Input	desired nom. DC output current per coil (ohmic load)
alpha	Input	current form factor (RMS > average!) 1.5 ... 2
Uaminn	Input	desired minimum nominal output voltage, to remember your goal
Uamin	Input	minimum nominal output voltage for computation
rho	constant	Copper thermal specific resistance
L	Input	line length from house mains entry to transformer,one way (metres)
A	Input	wire cross section area of this line with length L
Rk	computed	resulting line resistance for both ways
Unetz	Input	nominal effective mains voltage
fn	Input	mains frequency
tolup	Input	upper limit of mains voltage variation
tolow	input	lower limit of mains voltage variation
ü	computed	transformation ratio
ü2	computed	impedance transformation ratio
Rks	computed	line resistance transformed to secondary, usually very small
f	Input	actual used transformer loss factor
f	computed	heuristical determined loss factor, no large difference with actually used, unless reason for this is known!
U0eff	computed	nominal sine AC effective transformer voltage per coil with no load
Ineff	computed	nominal sine AC effective transformer current per coil
In	computed	nominal sine AC transformer peak current per coil, compare with Imax for a hint for alpha (value is doubled in case of Center circuit, since only one coil at a time is conducting in this rectifier circuit, while both are conducting with pure resistive load)
Imax	computed	secondary peak current per coil, also current through diodes, compare with In to avoid core saturation
Idm	computed	average diode current
Pa	computed	total power per winding delivered to load resistor
Pn	computed	total transformer power, including rectifier power, load power, all coils and factor alpha
Pns	computed	Pn divided by number of coils (1, 2)
Ua0+	computed	idle voltage on capacitor, including mains upper Ua0+ tolerance
Ua0	computed	idle voltage on capacitor, nominal mains
Ua0-	computed	idle voltage on capacitor, including mains lower tolerance
Usper+	computed	idle voltage stress on diodes, including mains upper usper+ tolerance
Ua8+	computed	infinite capacitor voltage with load and mains upper Ua8+ tolerance, can be used to estimate e.g. amplifier losses
Ua-	computed	capacitor voltage (capacitance value Cl), including mains lower tolerance and line losses and ripple, lowest instantaneous value
Ua8	computed	infinite capacitor voltage with load, nominal
Ua8ber	computed	tryed infinite capacitor voltage with load
r	computed	ratio between Ua8 and Ua8ber in %, error of iteration, minimise to 0.0!
Uneff	iteration input	nominal effective transformer secondary voltage, this value must be iterated to minimise r
Rv	computed	load resistor that would draw Ia with infinite capacitor
Ri	computed	transformer resistance for each coil
Ri+main	computed	effective transformer resistance for each coil, including line losses
Cl	computed	capacitor size for give ripple, frequency, load
Pd	computed	power loss per diode
Pg	computed	total power loss, sum for all diodes