SPECIAL REPAIR/ REPLACEMENT TO POWER TRANSFORMER AGAINST BER UNDER GE (AF) ADM AREA AT AF STN AGRA

Amount

Taking out old 33/11KV transformer of capacity 3.15 MVA from foundation including disconnection of all HT Cables/Conductor, earthings strips etc and deposit to MES Store yard. Note : Contractor should be responsible for all T&P for shifting of transformer.

Supply, installing, testing and commissioning outdoor type, Energy efficient Power Transformer, step down transformer, 33/11 KV,3 phase, 50 Hz Cycle, 3.15 MVA (3150 KVA), core type copper wound, oil immersed, naturally cooled, Oil natural, air natural (ONAN),complete with first filling of IS-335 ISI marked filtered and dehydrated transformer oil and other standard fitting/Accessories and 17 position on load tap changer (OLTC) (Tapping range +5%to -15% in steps of 1.25% Each) with remote tap cubical changer (RTCC) panel and automatic voltage regulator (AVR) DYN-11 (Vector Group). The Max voltage ratio HV/LV (36Kv/12Kv). Over voltage operating capability and duration 112.5% of rated voltage. Anticipated continuous loading of HV/LV continuous 110% rated current. HV power frequency (KV RMS)- 70. LV Power frequency (KV RMS)- 28. HV Impulse with stand voltage (KV peak) : 170 KV. LV Impluse with stand voltage (KV-75). The maximum temperature rise should not exceed 45 degree Celsius in oil and 55 degree Celsius in HV/LV winding when measured by resistance method after continuous full load run on an ambient temp. Standard IS :2026 with Copper wound and oil die electric strength more than 60 KV. No losses at rated voltage and frequency . Load losses at rated Current & 75 Degree Celsius . Impedance - 6.25% complete all as specified and directed. The factory testing before dispatch of transformer will be carried out as nominated by Accepting Officer comprising of the following:- (a) On Load Tap Changer (OLTC) (b) Remote Tap Cubical changer (RTCC) panel. (c) Automatic Voltage Regulator (AVR). (d) Termination at 33 KV side outdoor bushing. Termination at 11 KV side -cable box and accessories. (e) Buchholz Relay double float type (having contacts for alarm and trip) alongwith suitable size of copper cable from Buchholz relay to control panel. (f) OTI (having contacts for Alarm & Trip) alongwith suitable size of copper cable upto control panel. (g) WTI (having contacts for Alarm & Trip) alongwith suitable size of copper cable upto control panel.

(h) Marshalling box (having TTB only). (j) Oil conservator with filter type drain valve and oil level guage. (k) Dehydrating breather with first fill dehydrating agent (silica gel). (l) Explosive vent (m) Thermometer pocket on tank cover (n) One No 100 mm dia, dial type thermometer, vapour pressure type having range 0-120 degree Celsius with metal guard having maximum perimeter reading temperature indicator with resisting device for transformer. (o) Two earthing terminals. (p) Rating plate and terminal marking plate. (q) Oil level guage. (r) Oil drain valve with plug. (s) Lifting lugs (t) Oil filling hole with cap/plug with connecting plate complete (u) Air release valve plug (v) Removable inspection opening on Top Cover (w) Bidirectional CI rollers. (x) Arching Horn set (only for HV bare Bushing type Transformer). (y) Pressure relief valve (PRV) (having contact for Alarm & trip) (z) Hooter and protection relay for Buchholz Relay of suitable capacity and class at Remote panel. (aa) One danger notice board having conventional danger sign of skull with bones in painted in red colour.

M&L for bore well earthing in soil by vehicle mounted pneumatic drill machine upto depth of 50 meter below ground level using earth electrode 50mm dia GI pipe medium grade duly drilled hole 12mm dia on pipe,15 cm C/C on both side of pipe including lowering in bore well upto depth of 49.8 meter and 0.2 meter above ground level. The pipe electrode should be filled around commercial salt, charcoal dust, and magnesium phosphate of 30 cm layer each upto the full length of pipe. the bore well casing pipe should have 12 meter of length 150 mm dia 5 mm thickness MS pipe for protection of bore well welding of copper strip 50x6mm on earth electrode of length 0.5 meter and include upto 7.5 meter to the test point and GI tubing light grade 60 mm upto 7.5 meter from the bore well including test point gun metal or phosphorus bronze size 75x75x25mm, drilled screwed including 3 Nos, 8mm dia, 25 mm long hex head screw and PCC earth pit foundation in cement concrete 1:3:6 Type C-I (using 20 mm graded stone aggregate) surrounding the bore well of size 60x60x30cm and inner size 40x40 cm with frame made of angle iron 25x25x3mm for size pit cover of 40x40cm and pit cover 40mm thick made of CI of size 40x40cm, including handle made of 12mm MS round bar complete all as directed . Note: (i) Copper strip up to transformer shall be deemed to be included in the quoted rates. (ii) Protection light grade GI pipe upto 7.5 meter shall be deemed to be included in the quoted rates (iii) The earthing value of each earthing pit should be below 1 Ω (Ohm). (iv) Excavation and all earth work shall be deemed to be included in the unit rates as quoted by the contractor.

Sant Construction Co. (BID ID -3141019)

RAVINDRA BROTHERS (BID ID -3128938)

M/s SCHOLASTIC ENTERPRISES (BID ID -3129127)