The present qualification system serves as the prequalification for the supply of three-phase power transformers ranging from 15 MVA to 100 MVA. Companies with the capability to deliver large power transformers for the 380kV grid in the above mentioned power range are invited to submit their requests for participation. This qualification system contains critical electrical data and implementation guidelines to ensure performance, safety and compatibility with our existing infrastructure.

Qualification System for Large Power Transformers (LPTs)

EnBW is seeking requests for participation for production, delivery and operational handover for high-quality large power transformers for our **380kV grid projects. Companies with the capability to meet our technical specifications are invited to submit their requests for participation. This qualification system contains critical electrical data and implementation guidelines to ensure performance, safety and ability to implement our projects. Below are the summarized technical requirements: **Electrical Specifications:** - **Design:** Three-winding power transformer - **Rated power: **400/200/200 MVA - **Voltage ratio: **400/33/33 kV - **Vector group: **YNd11d11 - The specified no load sound power level, measured according to the sound intensity method is 93 dB(A). - **Cooling type: **provided by an ONAF system. - **Short circuit voltage: **specified as 22% for HV-LV1, 22% for HV-LV2, and 44% for LV1-LV2. - The transformer is designed in accordance with DIN 60076 - An on load tap changer is provided with 17 steps and a total voltage control range of −10% to +10% **Important Keywords:** 380 kV Transformers, High Voltage Transformers, Three-Winding power transformers, Outdoor Installation Transformers We look forward to receiving your request for participation and potential partnerships.