| 摘要 |
<p>Differential transformers are in the leads from the main transformer to the heavy duty electrode conductors are connected to a resistor network, either star delta or simple star, such that the voltage, between the star terminals and the star point are an analogue of the back emfs. induced in the leads. The ohmic volt drops in these leads, represented by voltages across individual resistors fed by direct current transformers are added to these to give the net volt drop. These are subtracted from the measured terminal voltages of the mains transformer, derived through an isolating transformer and these differences are the required measurements.</p> |
