87726 PROVISION OF 01 TRANSFORMER OF CAP 500 KVA WITH CONNECTED ITEMS AT SUB STATION H (NORA) INS RAJALI ARAKKONAM

SCHEDULE 'A' PART-I

Supply, install, testing and commisioning of copper wound Distribution Transformer stepdown Level 2, 11 KV/0.433KV, Three Phase complying with IS: 1180/IEC-76(Part-1) 2014 with latest amendments No.4, outdoor type double copper wound suitable for 50 Hz system of capacity 500 KVA, oil immersed naturally cooled delta connected on HT side and Star connected on LT side ,Vector Group Dyn-11. provided with OFF load tap changer to vary secondary voltage from -7.5% to + 7.5% in step of 2.5%. Losses should be confined to the limits specified as follows: maximum allowable losses at full load (100 %) & Half Load (50 %) shall not be exceeded 1430W & 4100W respectivly and as per GRIHA RATING, Percentage Impedance: 5%. Impedance are subjected to tolerance as specified in IS 1180. The transformers should be supplied with first filling of oil confirming to IS 335. The transformer should have both side cable end box with neutral brought out complete and installation of transformer shall be carried out and comprising with the following standerd fittings/Technical specifications : -

Item No 2 Contd... (a) Lifting lug for transformer and tank. (b) Earthing terminal rating and diagram plate. (c) Air release device on main transformer tank. (d) Oil filling inlet pipe with plug. (e) Drain outlet pipe with brass gate valve. (f) Conservator tank with oil level indicator (g) Silica jel breather (i) First fill of oil upto level including conservator tank with fresh new oil conforming to IS335. (k) Type of connection Delta/Star (1) Type of cooling: Oil and Natural Air. (m) Vector group:DYN 11. (n) Temperature rise over an ambient of 50 °C maximum. (o) Air insulated Cable end box on both side for HT/LT cables of suitable size. (p) Provision of thermometer with pocket. (q) Provision of oil and winding temperature gauge. (r) Breather with silica gel with oil seal and first fill of silica gel (s) Rating diagram and terminal marking plate (t) Oil temp and winding temp indicator with maximum read pointer (u) Marselling Box

PCC (1:2:4) type B-1 using 20 mm graded aggregrate for making platform for transformer and good the disturbed surface all as specified and directed.

PCC (1:2:4) type B-2 using 40 mm graded aggregrate for making foundation of platform for transformer and making good the disturbed surface completeall as specified and directed

Supply,laying XLPE insulated, screen, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor of size 185 sqmm 3 core, connecting with proper size Aluminium lugs, glands from exiting RMU to LBS and LBS to Transfromer all as per site requirement , testing complete all as specified and directed.

Excavation in trenches, not exc 1.5 m wide and not exc 1.5 m in depth for taking up / laying cable etc and getting out for soft/loose soil complete all as specified and directed.

Spreading riddled earth for low thermal resistivity UG cable cushioning complete all as specified and directed

Supplying and laying un-reinforced precast concrete cable cover, class HVP,type 1 with peak, size 300mm x 180mm x 40mm

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exc 25cm for soft/loose soil complete all as directed.

Removing excavated material not exc 50m and depositing where directed at a level not exc 1.5 m above the starting point complete all as directed.

Supply and lay standard size common burnt clay building bricks sub class 'B' for cable protection, laid dry complete all as specified and directed.

S&F Cable end jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of 185 sqmm.

S&F Cable end jointing kit for 11 KV (Earthed) grade cable for indoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of 185 sqmm.

M&L for removing of existing cable termination complete from existing VCB and LT panel to refix after proper allignment with existing indoor/outdoor VCB incl enclosure fitting jointing, nut and bolt Lugs etc complete all as specified and directed.

Supply,laying XLPE insulated, screen, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor of size 300 sqmm 3.5 core, connecting with proper size Aluminium lugs, glands whereever necessary near from transformer to LT panel change over 1000 Amps in LT Panel based atv NORA Sub Station all as per site requirement , testing complete all as specified and directed.

S&F Cable end jointing kit for indoor termination heat shrink type suitable for 3.5 core XLPE armoured aluminium conductor cable of 300 sqmm for complete with jointing material and accessories

Supply and lay pipe galvanised iron tubing light grade of 100 mm dia in trenches/under road or floor/on wall / near pole/panel etc all as per site requirement complete all as specified and directed.

Surface dressing upto 15cm deep in cable route vicinity and clearing of vegetation/soil removing and depositing where directed not exceeding 50m from starting point complete all as directed.

SIGNATURE OF CONTRACTOR

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