Hello everyone. I work in train control. In this industry we use impedance bonds to pass 750v dc and block the track circuit ac signal thereby achieving track circuit separation. There is an unwanted condition that may occur ( unbalanced current) that can lead to core saturation and signal leakage through the impedance bond. I'm pretty sure how that condition is related to the formula reluctance equals length divide by permisivity times area but could someone verify how core saturation is related to this formula.