A method to determine the Linear Transformer Model parameters of a Neon Sign Transformer

The usual way to find the linear transformer model parameters of a NST is to measure the open circuit current and voltage to calculate the primary inductance. The secondary inductance is then incorrectly (the transformer is far from ideal, ie. k is not unity) assumed to be the output/input voltage ratio squared times the primary inductance. Several adjustments are then needed to the coupling coefficient and secondary inductance values to get the behaviour of the transformer (short-circuit current, open-circuit voltage etc) right. This iterative process (using PSpice) by trial-and-error is really hard because all parameters are never right at the same time.

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