Tender for the Supply of a Spare Transformer for MEDITE Europe DAC ‘25

Description

MEDITE Europe DAC requires a new spare 2500kVA transformer to be delivered to its site. Site Location: Medite, Redmondstown, Clonmel, Co. Tipperary. Please note that the successful bidder will be responsible for the supply of a 2500kVA transformer that would meet all the specifications and conditions mentioned in the specification table subsequently. The scope includes: • Complete transformer with all specified accessories and fittings • Delivery to site, including protective packaging suitable for road transport • Provision of drawings, operation and maintenance manuals, and test certificates • Manufacturer’s warranty 1. Specifications Schedule 1 - Transformer Specifications Sno Parameter Specification 1 Rated power 2500 kVA 2 HV rating 10.75/21.5KV 3 LV rating 423V 4 Phase 3 5 Frequency 50 Hz 6 Connections Delta/star with neutral 7 Vector group Dyn 11 8 Tappings Off-load tap changer (±5 percent, in five steps: +5 percent, +2.5 percent,, 0 percent,, −2.5 percent,, −5 percent,) 9 Tapping method Externally mounted off-circuit operated switch with facilities to lock in any operating position 10 HV rated current @ 10.75kV ≈ 134 A 11 HV rated current @ 21.5kV ≈ 67 A 12 LV rated current @423V ≈ 3412 A 13 Impedance voltage 5.9 percent, ± IEC tolerance 14 HV Short circuit current @ 10.75kV ≈ 2271 A 15 HV Short circuit current @ 21.5kV ≈ 1138 A 16 LV Short circuit current @ 423V ≈ 57834 A 17 Short circuit withstand 2 seconds minimum 18 Insulation level IEC standard for 11 kV: Lightning Impulse 75 kV, Power Frequency 28 kV 19 Cooling method KNAN (K-class natural ester oil, air natural cooling), hemetically sealed, Integral radiator type tank 20 Insulating fluid Biodegradable natural ester oil per IEC 61099 or equivalent, nontoxic 21 Fire point ≥300°C 22 Temperature rise Oil: 65°C, Winding: 70°C above ambient 23 Location Outdoor ground mounted 24 Ambient temperature 40°C 2. Construction Schedule 2 - Construction Sno Parameter Details 1 Core Cold rolled grain-oriented silicon steel, step-lap design for low losses 2 Windings High conductivity copper, thermally upgraded insulation, vacuum dried and impregnated 3 Tank Welded steel tank, corrosion protected with primer and polyurethane finish to EN ISO 12944 for outdoor use 4 Paint finish E-coated/Galvanised and painted RAL 7033 5 HV termination 3 pole cable box with undrilled gland plate suitable for cable from below/above 6 LV termination 4 pole cable box with undrilled gland plate suitable for cable from below/above 7 Bushings HV + LV bushings as per IEC 60137, porcelain or polymeric type 8 Neutral bushings LV neutral bushing brought out for earthing 3. Accessories and Fittings Schedule 3 - Accessories and Fittings Sno Details 1 4 Lifting lugs to be provided 2 Skid under base with 4 rollers 3 Nameplate stainless steel engraved, with ratings + with diagram, as per IEC requirement 4 Earthing terminals 5 Thermometer pocket 6 Conservator tank with magnetic oil level indicator and breather (silica gel) 7 Buchholz relay with alarm and trip contacts 8 Winding temperature indicator with dual alarm/trip contacts 9 Oil temperature indicator with alarm contacts 10 Over pressure relay 11 Drain valve and filler plug 12 Tap position indicator 4. Packaging and Delivery Transportation of transformer must ensure its integrity and functionality upon arrival on site. Packaging must ensure to prevent mechanical shock, moisture, and corrosion for long term storage on site. Delivery incoterms – Delivered at Place (DAP) ** See Tender Document attached***