Tenders Are Invited For Delivery, Installation And Commissioning Of 1 Pc. Power Transformer Type: Transformer 25/31.5 Mva, 110/11Kv Or Equivalent, According To Specifications

To Supply, Install And Put Into Operation A Three-Phase Power Transformer, Which Will Export The Produced Electricity From 2 Cogenerators Installed On The Territory Of Toplofikatsia - Ruse Ad To The Electricity System Of Bulgaria. 1. Characteristics Of The Working Environment And Installation Location 1.1 Ambient Air Temperature - Not Higher Than +40ºс Not Lower Than Minus 30ºс 1.2 Max. Average Temperature For 24 Hours + 35°C 1.3 Pollution - Pollution Degree 1 (P1) 1.4 Altitude - Up To 1000 M 1.5 Place Of Installation - Outdoors 1.6 Seismic Resistance - 0.3 G 2. Parameters Of The 110 Kv Network 2.1 Rated Voltage 3~110,000V 2.2 Maximum Voltage 123,000 V 2.3 Nominal Frequency 50 Hz 2.4 Number Of Phases 3 3 Parameters Of The 11 Kv Power Distribution Network 3.1 Rated Voltage 3~11000V 3.2 Maximum Voltage 12000 V 3.3 Nominal Frequency 50 Hz 3.4 Number Of Phases 3 4. Technical Parameters Name Req Declared Voltage 110 / 11 Kv Number Of Phases 3 Declared Power 110 Kv 25 / 31.5 Mva Declared Power 11 Kv 25 / 31.5 Mva Connection Diagram 11Kv Delta Wiring Diagram 110 Star With Star Center Announced Frequency 50 Hz Scope Of Change Of The Transformation Factor 110 Kv ± 10 X 1.25 % Maximum Efficiency At 31.5 Mva >99.7% Short Circuit Voltage Between Hv-Lv Windings: 10.5% No-Load Losses, P0<15Kw Hv/Lv Short Circuit Losses <140Kw Maximum Sound Power Levels - In Onan Mode, Db(A) 74 In Onaf Mode, Db(A) 78 Withstand Current At External Short Connection (3 S) 31.5 Ka Minimum Leakage Path On The Outside Surface Of Through Terminals 31 Mm/Kv Level Of Partial Discharges Max 300 Pc