Resin core dry type transformers are becoming a popular alternative to that of Oil immersed transformers and Voltex MVLV offers dry type transformers from 50kV up to 3000kV and operating voltages up to 33kV.
Cast Resin Transformers do not emit oil or toxic gases into the atmosphere and do not pollute the environment. Resin core transformers are strongly recommended as a replacement for askarel (PCB)- filled transformers.
Maintenance is almost eliminated with dry type transformers. No checking of liquid level and no dielectric test for moisture absorption is required. Due to the smooth coil surface, heavy dirt and dust build up are eliminated. The recommended routine maintenance is an occasional visual inspection, blowout and clean.
Based on the high thermal time constant factor of the windings, dry type transformers can be overloaded for a short duration. Considerably higher than traditional oil transformers. It has a greater capability to withstand sudden high overloads such as might be encountered in heavy traction applications.