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| 1 | Supply, installation, testing and commissioning complete with all accessories of power transformer of 33/11 KV capacity 05 MVA (5000 KVA) step down, outdoor floor mounted, double copper wound, 3 Phase, 50 Hz, AC, Oil immersed, ONAN confirming to IS-2026 and IEC62770, including cooling fans, external cooling tubes/radiator cores type having voltage ratio 33000/11000 volts (corresponding to principal tapping ) winding delta connecting on Primary side (HV Side) and star connected on secondary side (LV side) in accordance with vector symbol Dyn11 (vector Group) with neutral brought out on LV side and looping on HV side for contact output so as to alter/ vary secondary voltage by (+) 5 to (-) 15% in equal steps of 1.25% to be changed by means of (OLTC) on load Tap Changer with floor mounted RTCC panel with AVR and marshaling box. Transformer shall be of BOLTLESS core design. Transformer shall be double wound, core type with low loss, non ageing, high permeability PRIME GRADE, CRGO with m4 grade or better, perfectly insulated and clamped to minimize noise and vibrations, core shall be purchased directly from manufacturer of core or from their accredited marketing network and not through any agent. Before placing order for procurement of transformer, the contractor shall submit the credentials in respect of the manufacturer of core and transformer shall be procured only after approval from GE in respect of name of manufacturer of transformer as well as manufacturer of core. The limit of termperature rise after continous full load runs as specified in IS/IEC 60076 shall be suitably adjusted to suit the ambient temperature of maximum 50 degree celsius prevailing at site all as specified and directed including having following characteristics :- |
| 2 | The transformer shall confirm to the latest edition of applicable standard as follows :-(i) IS-2026, for tests and tolerance of guarnteed Particulars. (ii) IS-3639 for Fitting and accessories. (iii) IS2099 for Bushing >1000V. (iv) IS-7421 for Bushing <1000 V (v) IS-1271 for Electrical insulation classified by Thermal stability.(a) Winding:(i) HV Winding -Layer/disc winding(ii) LV Winding-Helical/Disc widing (b) Insulation Level: (i) HV-170 (ii) LV-70 (c) Insulation level (Power frequency with Stand KVrms):(i) HV 70 (ii) LV-28 |
| 3 | (d) Tapping Range -(+)5% to (-) 15% @1.25%(e) Tape Changer Type -On load Tap Changer +RTCC+AVR (floor mounted). (f) Temperature Rise (Oil/Winding) -50/55 Degree Centigrade(g) Hot spot temperature over a meximum yearly weight average ambient temp of 32 Degree Centigrade-98 Degree Centigrade(h) Termination HV/LV-Outdoor Bushing(j) Short Circuit thermal withstand time-02 seconds (k) %impedance at 75 °C clurrent and frequency (Subject to IS Tolrance) at -6.25% + tolerance(l) No load loss at rated voltage and frequency (subject to IS Tolerance) (KW) = 2.3 KW (max)(m) Load loss at rated current and 75 degree C (KW) (subject to IS Tolerance ) = 16 KW (max) |
| 4 | The transformer should have following fitting and accessories :-(a) Outdoor bushing on 11 KV secondary side for single core XLPE cable 3 Core 185 Sqmm - (Bare Bushing)(b) Outdoor 33 KV bushing insulator for connection through open conductor with sleeves.(c) Oil conservator with filling hole and cape drain valve and oil level guage. (d) Dehydrating breather wth connecting pipe first fill of dehydrating agent and oil seal.(e) Explosion relief vent mounted on tank with double diaphragm and equilliser pipe connection to conservator air space (Pressure release device)(f) Air relief plug.(g) Shut off valve between the conservator and buchholz relay.(h) Drain valve with threaded adopter. |
| 5 | (j) Filter valve with threaded adopter (Top and bottom).(k) Wheels (l) Rating plate and terminals marking plate.(m) Extra bushing for neutral out side the LV Side (n) Hand hole sufficient size to assess the interior of the tank.(o) First filling of the transformer oil.(p) Cover Lifting eyes.(q) Double float Buchholz relay with trip and alarm contacts.(r) 150mm dial type thermometer for winding temperature indicator having range 0-12 centigrade vapor pressure type with maximum reading pointer/Max temperature indicator and resetting device with alarm/trip contact and additional contact for switching on the cooling fan.(s) Dial type thermometer for oil temperature indicator with 02 sets of contacts for alarm and trip having range 0-12 centigrade vapor pressure type with maximum reading pointer/Max temperature indicator and resetting device with alaram/trip contact .(t) Shut off valve between cooling tubes and tank.(u) Pressure Release Valve (PRV) with one set of trip contact.(v) Magnetic Oil gauage (MOG) with one set of trip contact. (w) Earthing terminal for connecting earthing lead |
| 6 | NOTE:-(i) The oil temperature and winding temperature guages shall be housed in a marshaling box made up of MS sheet as per manufacturer recommendations with hinged door and having glass front side of the box and provision for entry of cables and compression glands.(ii) Following documents to be submitted for core during the stage inspection:(a) Invoice of supplier(b) Factory test certificates(c) Packing list(iii) OEM should have in-house NABL accredited lab for testing. |
| 7 | M&L for lightning arrestor confirming to IS-3070 (Part-1) having voltage rating 36 KV, rated frequency 50 Hz, nominal discharge current 10 KA (heavy duty) station class type complete with all fittings suitable for 33 KV, 3 phase earthed distribution system complete all as specified and directed. |
| 8 | M&L for earthing complete with copper earth plate electrode 600 mm x 600 mm x 3 mm thick burried directly in ground vertically to a depth not less than 3.0 mtr deep below GL with top edge of the plate not less than 2.5 mtr below normal GL and connected to earth plate. Earth plate surrounded by 15 cm thick packed layers of charcoal dust and common salt upto 1.5 meter depth all around the earth plate and connected to earth lead of copper strip 20x3 mm by means of bolts, nuts, check nuts and washers of GI or steel and thimbles and other end of the earth wire connected to DB and protected by galvanized iron or steel pipe light grade 40 mm bore and water pipe 20mm bore GI medium grade with funnel and wire mesh, including all necessary excavation and earth work PCC chamber in cement concrete 1:3:6 type C-2 and RCC cover and all as shown in electrical plate No 3 of MES schedule Pt I of 2009 and also including making test point for testing of earthing made out of gun metal or phosphorous bronge size 75x75x25 mm complete all as specified and directed. Note : 1. RCC pit cover shall be pre-cast of RCC (1:2:4) type B-I , 80mm thick reinforced with XPM weighting not less than 4 KG/sqmm in lieu of CI cover.2. Charcoal dust and common salt upto 1.5 meter depth shall be filled in layers of 15 centimeters all around the earth plate. 3. On testing after completion of earthing if desired earth resistance is not achieved, the earthing will be redone at no extra cost to obtain the desired earth values.4. The cost of copper earth lead & G I pipe of 7.50 mtr length for protection of earth strip and excavation work for pit shall deemed to be included in this item. |
| 9 | M&L for earthing complete with galvanised steel earth plate electrode of size 600X600X6 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.50 mtr below the ground level connected to galvanised iron strip of 32x6 mm as earth lead by means of bolts nuts check nuts & washers of galvanised iron or steel ,surrounded by charcoal of coke and salt, protected by GI pipe 40 mm bore (light grade), water pipe 20mm bore GI medium grade with funnel and wire mesh,and making chamber of PCC (1:4:8) type D-2 using 40 mm graded stone aggregate and coping shall be in PCC(1:3:6) type C-1 using 20 mm graded stone aggregate, 50 mm thick cover of RCC (1:2:4) type B-1 using 20 mm graded stone aggregate, reinforced with 8 mm dia TMT bars @ 80 mm c/c boath ways including excavation and earth work and removal of surplus soil to distance n exc 50 m complete all shown in electrical plate No 3 of SSR part- I and also including making test point for testing of earthing made out of gun metal or phosphorous bronge size 75x75x25 mm complete all as specified and directed. Note:(i) The cost of GI earth lead & G I pipe of 7.50 mtr length for protection of earth strip and excavation work for pit shall deemed to be included in this item.(ii) RCC pit cover shall be pre-cast of RCC (1:2:4) type B-I , 80mm thick reinforced with XPM weighting not less than 4 KG/sqmm in lieu of CI cover.(iii). Charcoal dust and common salt upto 1.5 meter depth shall be filled in layers of 15 cm all around the earth plate. (iv). On testing after completion of earthing if desired earth resistance is not achieved, the earthing will be redone at no extra cost to obtain the desired earth values. |
| 10 | Supplying, errecting and fixing steel tubular swaged poles of 12 meter long or next higher standard size as manfactured type 410 SP-64, complete with cast iron base plate, heat resistance finial taper plug, bolts, nuts and screws including painting with two coats of synthetic enamalled paint over one coat of red oxide primer and 06 Nos bands/straps with white/ red/ black/ yellow as required (30cm wide each) epoxy heat resistant paint at a distance 30cm from plinth block and numbering of poles with black synthetic enamel paint in 2.5 cm height complete all as specified directed.Notes: 1. Excavation, returning, removal, PCC for foundation and coping etc shall be measured and paid separately.2. Any damage done during erection of pole to the existing UG infra like UG pipelines, UG electric cables, OFC etc shall be repaired by the contractor at their own expenses.3. Cost of T&P required for transporting/ handling/ erection etc of pole is deemed to be included in the rate quoted by the contractor. |
| 11 | Material and labour for earth continuity conductor or main earthing lead fixed to wall on batten or suspeneded for creating overhead lightning protection grid or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required of size 4 mm dia galvanised iron wire complete all as directed. |
| 12 | Material and labour for earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required of size 32 x 6 mm galvanised iron strip complete all as directed. |
| 13 | Supply & fix single pointed air termination aluminium rod 12mm dia, 300 mm long mounted/ fixed at position as directed at site. |
| 14 | Material and labour for stay assembly complete comprising of 20 mm dia galvanised stay rod 180 cm long, MS galvanised stay plate size 300 x 300 x 6 mm thick for stay pole as shown in electric plate No 1 of SSR part-I for HT poles including necessary excavation, concrete, loop insulator, stay clamp and stay strand complete all as directed. |
| 15 | Excavation in trenches in any type of soil not exc. 1.5 mtr wide and not exc. 1.5 mtr in depth for laying of cable, foundation etc and getting out complete all as directed. |
| 16 | Excavation in trenches in any type of soil not exc. 1.5 mtr wide and exc. 1.5 mtr and not exc. 3.0 mtr in depth for laying of cable, foundation etc and getting out complete all as directed. |
| 17 | Returning, filling in including spreading levelling watering and well ramming in layers not exceeding 25 cm in soil complete all as directed. |
| 18 | Removing of excavated soil to a distance n exc 50 mtr and deposited where directed at a level not exc 1.5 mtr above the starting point complete all as directed. |
| 19 | Material & labour for PCC(1:4:8) type D-2 (using 40 mm graded crushed stone aggregate) as in foundations and mass concrete for foundations of poles etc complete all as directed. |
| 20 | M&L for cement concrete (1:2:4) type B-1 (using 20 mm graded crushed stone aggregate) as in coping of poles including necessary from work for finishing exposed faces of concrete even and smooth by and even using extra cement complete all as directed. Please Enable Macros to View BoQ information |
