Inductive Load Banks
For the high insulation strength, wound coils are impregnated in vacuum pressure. Works on principle of air gap variation.  It works on variation of air gap principle.
Voltage and ammeter are used to find the voltage and current at variable loads. 
 
Copper conductor connected with 3PH choke coil star.High grade silicon used with stamping. Fitted in trolley with MS box coated with powder.