| Standard range of 3 phase 50 Hertz Dyn11 aluminium conductor type 11000/433V transformers with fully cast class F HV windings and prepreg type LV windings. The design temperature rise is 100ºC at full load over a maximum ambient temperature of 40ºC. The tap range is plus or minus 2.5% and 5% by bolted links on the front of the coil face. 3 HV terminal studs are provided and 4 LV terminals with CUPAL connection plates. The standard temperature protection system comprises PTCs located in the LV winding hot spot and an L203 2 stage relay with alarm and trip contacts. An alternative system uses 3 - PT100 temperature sensors and a digital display relay with 4 switching points to enable alarm, trip and fan on and off operation. Load loss is quoted at 120ºC. |