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

Transformers – Delivery, Installation And Commissioning Of 1 Pc. Power Transformer Type: Transformer 25/31.5 Mva, 110/11Kv Or Equivalent, According To Specifications. To Deliver, 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 Place Of Installation 1.1 Ambient Air Temperature -• Not Higher Than +40ºс• Not Lower Than Minus 30ºс 1.2 Max. Average Temperature For 24H + 35°C 1.3 Pollution - Degree Of Pollution 1 (P1) 1.4 Altitude - Up To 1000 M 1.5 Place Of Installation -Outdoor 1.6Seismic Resistance -0.3G 2. Network Parameters 110 Kv 2.1Rated Voltage3~110,000 V 2.2Maximum Voltage123,000 V 2.3Rated Frequency50 Hz 2.4Number Of Phases3 3 Parameters Of Power Distribution Network 11 Kv 3.1Rated Voltage3~11000 V 3.2Maximum Voltage12000 V 3.3Nominal Frequency50 Hz 3.4Number Of Phases3 4. Technical Parameters Name Requirement 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 Scheme Of Connection 11Kv Delta Connection Diagram 110 Star With Star Center Point Declared Frequency 50 Hz Range Of Variation Of The Transformation Coefficient 110 Kv ± 10 X 1.25 % Maximum E.P.C. At 31.5 Mva >99.7% Short-Circuit Voltage Between Windings Hv-Lv: 10.5% No-Load Losses, P0 <15Kw Short-Circuit Losses Hv/Lv <140Kw Maximum Sound Power Levels - In Onan Mode, Db(A ) 74 In Onaf Mode, Db(A) 78 Withstand Current At External Short Circuit (3 S) 31.5 Ka Minimum Leakage Path On The Outer Surface Of The Via Terminals 31 Mm/Kv Partial Discharge Level Max 300 Pc