PROVN OF 500 KVA TRANSFORMER AND ITS CONNECTED ITEMS AT DGNCC DHOBIGHAT AREA UNDER GE (UTILITY) ELECTRIC SUPPLY, DELHI CANTT 10

Amount

Supply & install ,testing and commissioning of transformer as per IS : 1180 part - I, level - II ,step down, copper wound 11KV/433 Volts (at no load) AC 3 phase 50 Hz 500 KVA capacity, core type, oil immersed naturally air cooled, oil natural air natural (ON/AN) , with external cooling tubes, delta connected on primary side (HV) and star connected on secondary side (LV) in accordance with vector group DYn-11 with neutral brought out on secondry side (LV) and having taping at +5% to +10% in steps of 2.5% on HV side to be changed by means of hand operated off load tap changergear. The maximum temperature rise should not exceed 50 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 of 40 degree celsius 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. The transformer shall be IS/IEC 60076and as per IS-1180 part - I of 2014 marked and shall comprise of the following :-

(a) One cable box on HT side (Primary side) consisting of three nos porcelain bushing with copper rods, complete with nuts and washer , with cable glands suitable for reception/taking out 3 core 120 Sqmm, HT 11000 volts grade, XLPE insulated and PVC sheathed, heavy duty , armoured cables including jointing materials complete. (b) One cable box on LT side(secondary side) consisting of four nos porcelain bushing with copper rods, complete with nuts and washers, with cable glands suitable for reception/taking out single core 630 sqmm, LT 1100 volts grade, PVC/XLPE insulated and PVC sheathed, heavy duty, armoured cables including jointing materials complete. (c) conservator with filter type drain valve and oil level guage. (d) De-hydrating breather with first fill of dehydrating agent (Silica Gel). (e) Explosive vent, Thermometer pocket on tank cover, oil level guage, Oil drain filter valve, at bottom of the tank Lifting ligs,oil filling hole with cap/plug with connection plate complete, Air release valve plug and four nos plain solid cast steel detachable rollers. (f) One No 100 mm dia, dial type thermometer, vapour pressure type, having range 0-120 degree celsius with metal guard having maximum perimeter temperature reading indicator with re-setting device. (g) Two earthing terminals on tank cover to facilitate fixing of 50x6mm galvanised iron earth strip for earthing of body. (h) Rating plate and terminal marking plate. (j) Extra bushing for neutral in the LT cable box for providing independent set of earthing for neutral. (k) First fill of new and unused transformer oil, IS-335 of 1986 marked, filtered and tested upto 50 KV dielectric strength at 2.5 mm air gap between testing electrodes, specific resistance at 27 Degree celsius Ohm-om 500 x 10 the power12, water content 50 PPM, Dielectric dissipation factor (tan Deta at 90 degree celsius) 0.005, Neutralisation value mg of KOH/gm of oil 0.03, Inter facial tension N/M at 27 Degree celsius - 0.04, flash point 140 Degree celsius and sluge 0.1 % by weight. (l) Providing adequate size and nos of channels, embeded in floor, for movement of transformer. (m) Tranformer losses shall not exceed the loses mentioned in Table 6 of IS: 1180 of 2014 Part - I with energy Effeciency level - III. (n) Oil temperator indicator , winding temperature indicator, marshlig box single window, double flit buchoiz relay with alarm and trip contact including connection to existing RMU/VCB relay with PVC insulated PVC sheathed cable galvanized steel strip or wire armoured electric control cables (Heavy duty) with stranded copper conductor of size 1.5 sq mm 10 core 1100 volts grade.

NOTE :- (i) Rate quoted includes the cost of making and Testing of controll wiring connection at the Transformer and RMU/VCB for the Temperature alarm/Trip, Gas alarm/Trip. (ii) Controll cable shall be measured and paid seperatly.

Supplying , installation, testing and commissioning of 11 KV, 630 Amps having short circuit capacity 20kA/3-sec, Outdoor (IP54), RMU (Ring main unit) 4-way comprising of 02 Nos motorized operated Load Break Switch and 02 Nos 630 Amp Fixed-Type motorized spring-charging VCB electrolytic grade copper busbars all inside single, gas-filled, robotically welded stainless steel 304 (Non Ferrite Non Megnetic Grade) tank with min. thickness 3+0.5 mm, IP 67 Degree of Protection , internal-arc classified 20kA/1sec, on-site-repairable with site replacable bushing/coupling/mechanism, gas refilling etc. The enclosure shall have padlockable double-door access with anti-theft higes, fully covering the front facia and cable boxes to ensure fail-safe anti-theft protection. The unit alongwith Bus-connected, fixed-type Auxiliary transformer shall include the following along with all necessary accessories and fittings as required at site.

(A) 02 Nos. Incoming Load Break Switch module each consisting of following accessories :- (i) Each switching-unit is designed as a three position switch. This three function switch combines the functions of switch-disconnector and earthing switch. (ii) 11kV, 630A Load Break Switch with interlocked line-earthing scheme both short circuit current - 20kA/3-sec, Making Capacity - 50kAp -01 No (iii) Auxiliary contacts - 1NO + 1NC-01 No (iv) Spring-assisted snap-action motorized mechanism with un-inhibited operating shaft for emergency manual operation with integrated earthing switch -01 No (v) Cable terminals (site replacable Cable bushings situated not beyond 300mm from cable-cover to allow ease of access for installation/testing/replacement purposes) with double-door arrangement for enhanced safety (IP54+IP3X) interlocked to prevent access upto 11 KV , 300 Sqmm , 3 Core , XLPE AL cable termination in live-condition. Each Set of 03 (vi) Right angle boots (push on type)-Each Set of 03 (vii) Arc proof cable covers having cable entry from bottom , front with Interlocking mechanism including earth switch -01 No (viii) Capacitive voltage indication fixed type system as per IEC61243 with LED - 01 Set (ix) Fault Passage Indicator - It is to be provided for each incomer load break unit, FPI with LED/digital display to be added for detection of cable fault-01 No (x) ON, OFF, EARTH mechanical indication on the front mimic of the panel - 01 No

(B) 02 Nos. Outgoing VCB module each consisting of following accessories :- (i) Each function-unit consists of a vacuum-circuit breaker in combination with a three position-switch.The three-position-switch fulfills the operation of the disconnector-function and earthing function. (ii) 11kV, 630A Fixed-Type VCB module with series disconnector cum earthing switch of short circuit breaking current/withstand - 20kA/3-sec, Making Capacity - 50kAp-01 No (iii) Aux. contacts - 1NO+1NC-01 No (iv) Stored-energy motorized high-endurance spring charging mechanism (M1+), with inbuilt spring-charging lever and mechanically latched ON/OFF push-buttons to allow handle-less and un-inhibited operation -01 No (v) Cable terminals (site replacable Cable bushings situated not beyond 300mm from cable-cover to allow ease of access for installation/testing/replacement purposes) with double-door arrangement for enhanced safety (IP54+IP3X) interlocked to prevent access upto 11 KV , 185 Sqmm , 3 Core, XLPE AL cable termination in live-condition. Each Set of 3 (vi) Right angle boots (push on type)-Each set of 3 (vii) 3O/C + 1E/F self powered numerical protection relay with Low and High set for Over current and Earth Fault. Relay should have facility to display the maximum loaded phase current also.Relay shall record minimum 5 fault records with time stamping. Relay shall be communicable with RS 485 Port on MODBUS Protocol-01 No (viii) Associated ring-core cast-resin insulated CTs 100/50/1 Amp , 2.5 VA, 10P10 for protection - Each Set of 3 (ix) Arc proof cable covers with self Interlocking mechanism with earth switch -01 No (x) Capacitive voltage indication fixed type system as per IEC61243 with LED -01 No (xi) Push button for breaker trip (xii) Shunt trip coil 24V DC - 01 (xiii) ON, OFF, TRIP mechanical indication on the front mimic of the panel - 01. (xiv) Emergency Trip Push Button - 01.

(C) 01 No. Bus-connected, fixed-type Auxiliary transformer with floor-mounted compartment of matching height and depth, positioned along-side RMU or on the top of the RMU to provide required aux. supply and metering consisting of following accessories :- (i) 1-Ph (11kV/rt3):230VAC, 500VA Auxiliary transformer-01 No (ii) 2x12 Volt DC battery-01 Set (iii) Battery charger-01 No (iv) HRC fuse-links for primary side isolation and AC/DC MCBs for secondary isolation-01 Set (v) Voltmeter & RYB LED Indications to confirm AC/DC supply availability-01 Set (vi) Anti-condensation space-heater-01 No (vii) CFL lamp for illumination and 3-pin socket with switch -01 No

(D) Additional equipment deliverd separately or mounted seperately :- (i) Operationg Handle for Manual Isolator/Disconnector/Earthing Operation-02 Nos (ii) Standard Manometer -01 No (iii) Operation and Maintenance Manual -01 No (iv) Installation & Commissioning Manual -01 No (v) Cable clamping provision (standard) -01No

Note:- (i) It is preferable to have all feeder-switches inside single stainless steel compartment with incomer feeders at the extremities to prevent chances of failure due to plug-in coupling arrangement. (ii) Necessay interclocking arrangement shall be provided for safety and operations (iii) Above switchgear shall confirm to relevant IEC (62271-200) for design, manufacturing and internal arc compliance. Any claims towards internal arc compliance, number of mechanical/electrical/short-circuit operations, gas-leakage rates etc. shall not be accepted unless proven via type-test reports of model being offered. (iv) Cost of provn of plinth for RMU as per OEM drawing is deemed to be included in the cost.

(b) Outgoing (i) MCCB 4 pole , 400 Amps,50 Hz,415 Volts, 50 KA with microprocessor release - 01 Nos (ii) MCCB 4 pole , 250 Amps,50 Hz,415 Volts, 36 KA with microprocessor release - 01 Nos (iii) MCCB 4 pole , 200 Amps,50 Hz,415 Volts, 36 KA with microprocessor release - 01 Nos (iii) MCCB 4 pole , 160 Amps,50 Hz,415 Volts, 36 KA with microprocessor release - 02 Nos (c) Platform of Panel. Platform for the panel with PCC 1:4:8 type D-2 with 40 mm graded crushed stone, 15 cm thick in foundation, brick work in CM 1:6 with sub class 'B', old size bricks, rendering 15 mm thick in CM 1:6 on exposed surfaces and 100 mm thick PCC padding 1:3:6, type C-1 using 20 mm graded crushed stone aggregate on top and grouting bolts etc for panel. The platform shall be such that it is of a height 45 cm above the nearest road level. Note :- (i) All out going feeder shall be connected by cable through suitable size gland plate / glands. (ii) The various feeders shall be indicated by 50 mm size letters in synthetic enamel white paint. (iii) All MCCB with adjustable protection for over load and short circuit and conforming to IEC60947-II/IS 13947-II (Latest Version). The MCCB should have Ics=100%Icu. The MCCBs shall have spreader links and barriers as standard feature of manufacturer

Supply, laying and testing cable HT XLPE insulated , screened, PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty) 11000 volts grade with stranded aluminium conductor of size 120 Sqmm 3 core.

Supply, Laying, connecting, testing and commissioning of LT XLPE cable of PVC sheathed armoured aluminium conductor 1100 V graded 630 sqmm single core complete all as specified and directed.

Excavation in trenches not exc. 1.5 m wide and not exc 1.5 mtr deep in soft loose soil for laying / taking up/ taking down of cables and getting out and levelling of bottom suface to required level all as specified and directed by Engineer- in- Charge.

Returning filling in,. Including spreading, levelling,. Watering and well ramming soil in layers not exceeding 25 cm thick all as specified and directed.

Removing excavated material (ie soil) from site to a distance n. exc 50 mtrs away and depositing where directed at a level n. exc. 1.5 mtr above the starting point all as specified and directed by Engineer-in-Charge.

Material and labour for river washed and screened, dry sand for filling in trenches below and around underground cables for cushioning of cables etc, complete all as specified and directed. Note : -Only Punned sand shall be measured and paid for.

Supplying and laying un-reinforced precast concrete cable cover, class HV, type 1, flat size 300mmx 180mm x 40mm. Complete all as specified and directed.

M&L for boring of holes under road/pavement/hard standing by manual technology using and necessary machine including material and labour for suitable dia of GI pipe 80 to 100 mm GI pipe complete all as specified and directed.

Supply and laying galvanised iron pipe 80 mm bore light grade fixed to poles with steel clamps laid under road crossing fixed to wall etc complete all as specified and directed. Note : -Clamps shall be measured and paid separately

Supply and fix Cable 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 120 Sqmm HT XLPE armoured aluminium conductor cable

Supply and fix Cable 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 120 Sqmm HT XLPE armoured aluminium conductor cable

M&L for plate Earthing complete with galvanized steel earth plate electrode 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 1.5 m below normal ground level connected to galvanized earth strip 32 x 6 mm by means of bolts and nuts checknuts and washers of galvanized iron electric arc welding all joints all as specified and shown in electrical plate No 3 of SSR part I including necessary excavation and earth work in any type of soil PCC 1:3:6 type C1 chamber with RCC 1:2:4 type B1 40 mm thick cover with MS rod 8mm dia 150mm long reinforcement, watering funnel, 40 mm dia light grade for protection of earth electrode 20 mm dia for watering all as specified and directed and tested on completion.

Note : contractor should procure and provide 50 % of the material as listed above within 15 days of the placing of work order and shall be verified by the Eng-in-charge

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