PROVISION OF 100 KVA STABILIZER AT RECEIVING STATION (LAWSONS BAY) UNDER AGE E/M NO-II OF GE (U-I) VISAKHAPATNAM

Supply, installation, testing and commissioning of static voltage stabilizer of capacity 100 KVA for automatic IGBT controlled (unbalanced load), microprocessor based digital 3 phases, 4 wire, Air cooled, indoor type and designed for input variation between 360 V to 468 V with output voltage stabilized at 415 V with accuracy (+/-) 1% (P-P) complete all as specified and directed by Engr-in-Charge with following specifications :- (a) Type : IGBT static voltage stabilizer indoor (b) Rated Freq : 50 HZ. (c) Wave form distortion : Nil. (d) Response time : Not to exceed 10 milliseconds. (e) Duty cycle : continuous 100 % loading at lowest input voltage for indefinite time. (f) Rate of correction : Greater than 3000 volts/sec, the said voltage regulator should sense as well as correct any voltage sag / fluctuation within 20 milliseconds, i.e. one wave form. (g) Overload capacity 125 %, it should be take startup load with high in rush currents. (h) Efficiency : greater than 96 % at 100 % and highest voltage input. (j) Type of load : Three phase unbalanced type. (k) Digital display voltmeter/ Ammeter. (l) Cooling type : Air cooled (Contd...) switching frequency with typical voltage correction time 20 MS (one cycle for 50 HZ supply) so tha! output voltage with the requirement of ITIC curve for regulated voltage supply to electronic machinery (iv) Voltage regulation should be achieved by superimposition of PWM wave on incoming wave. without and break in the power path (v) Warranty 2 years

(Contd...) (m) Protections :- (i) MCCB / MCB for overload and short circuit protection. (ii) Integral bypass and Manual bypass arrangement. (iii) Voltage regulations shall be performed by IGBT driven PWM invertor operating at around 20 KHZ switching frequency with typical voltage correction time 20 MS ( one cycle for 50 HZ supply) so that output voltage with the requirement of ITIC curve for regulated voltage supply to electronic machinery. (iv) Voltage regulation should be achieved by superimposition of PWM wave on incoming wave, without and break in the power path. (v) Warranty : 2 years

S&F 50 mm bore dia galvanised steel tubing, light grade, laid under road crossing, for cable protection or fixed to poles, walls or laid under floors complete all as specified and directed.

All as per Sl item No. 2.00 here in before but 80 mm bore

M&L for cutting the bitumineous mecadam / hard standings in road and excavating trenches across the road in size not exceeding 0.45 m wide and 0.6 m depth for laying cable / cable protection pipe including returning and refilling earth & making good top surface of the disturbed portion with 100mm thick PCC (1:2:4) type B-1 (using 20 mm graded stone aggregate) / bituminous mix as per existing & matching with the surroundings including removal of rubbish off to a distance not exceeding 100 m complete all as specified and directed. Note:- Unit rate quoted against this item shall deemed to include road cutting, earth work excavation, plain cement concrete work required for making good top surface etc., complete.

Supply & fixing LT XLPE, PVC insulated, armoured heavy duty electric cable with alumimium conductor, 1100 volts grade, cross sectional area 120 Sqmm x 3.5 Core, laid in trenches / duct / on pole complete all as specified and directed.

All as per Sl item No. 5.00 here in before but cross sectional area 150 Sqmm x 3.5 Core

Excavation in trenches, not exc 1.5 m wide and not exc 1.5 m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, laying cables etc. n exc 10 sq m on plan and n exc 1.5 m in depth and getting out in soft / loose soil, complete all as specified and directed.

Returning, filling in and including spreading, levelling, watering and well ramming in layers not exceeding 25 cm thick complete all as specified and as directed.

Removing of excavated surplus soil to a distance n. exc 50 m and depositing where directed at a level n. exc. 1.5 m above the starting point complete all as specified and directed.

M&L sand cushioning with clean and dry sand in trenches for protection of UG cable and including punning down complete all as specified and directed. Note:- Punned thickness of sand coushioning shall only measured and paid.

Supply & laying sub class 'B', class designation 75 bricks of old size, laid over sand cushioning along alignment of cable as protection to cable in trenches complete all as specified and directed. Note : Sand cushioning will measured and paid seperately.

M&L earthing complete with galvanised steel earth plate electrode of size 600 x 600 x 6 mm thick buried directly in ground in vertical position (earth pit not less than 2.25 m deep below the normal ground level) with top edge of the earth plate not less than 1.5 m below normal ground level, connected to earth lead of galvanised iron strip 32 x 6 mm by means of bolts, nuts, check nuts and washers of galvanised iron or steel, all as shown in electrical plate No. 3 connected to earthing test point complete all as specified and directed. Note:- The unit rate shall also include for earth work in any type of soil, PCC 1:3:6 type C1 chamber, RCC 1:1.5:3, type A1 cover slab, 50 mm thick reinforced with 8 mm dia TMT bar @ 140 mm C/C both ways, 10 mm dia plain bar lifting handle embedded in cover slab, Main earthing lead from earth electrode to test point upto 7.5 m length, 20 mm bore medium grade GI watering pipe, 40 mm bore GI medium grade earth lead protection pipe, funnel, wire mesh, copper lugs, charcoal and common salt in alternate layer etc.

Supply, installation, testing and commissioning cubical type LT Panel Board, outdoor type, double door factory made from CPRI approved factory, made out of 3.15 mm thick CRCA sheet and including MS angle iron 75 x 75 x 8 mm frame work, legs 0.6 m long, MC 100 channel base, totally enclosed, dust & vermin proof using neoprene rubber gasket (IP-54), double leaf door shutter in front side and single leaf shutter in rear side fixed with hinges having necessary locking arrangement in both front and rear door, with four side projected slanting roof, provided with louvers for ventilation / heat dissipation, danger notice plate, duly powder coated of approved shade over a coat of red oxide primer both internally and externally and including mounting on PCC platform made out of PCC (1:2:4) type B1 (20 mm graded stone aggregate), 150 mm thick (100 mm below & 50 mm above GL) and including necessary form work, earth work and excavation. (Contd...)

Supply, installation, testing and commissioning cubical type LT Panel Board, outdoor type, double door factory made from CPRI approved factory, made out of 3.15 mm thick CRCA sheet and including MS angle iron 75 x 75 x 8 mm frame work, legs 0.6 m long, MC 100 channel base, totally enclosed, dust & vermin proof using neoprene rubber gasket (IP-54), double leaf door shutter in front side and single leaf shutter in rear side fixed with hinges having necessary locking arrangement in both front and rear door, with four side projected slanting roof, provided with louvers for ventilation / heat dissipation, danger notice plate, duly powder coated of approved shade over a coat of red oxide primer both internally and externally and including mounting on PCC platform made out of PCC (1:2:4) type B1 (20 mm graded stone aggregate), 150 mm thick (100 mm below & 50 mm above GL) and including necessary form work, earth work and excavation. (Contd...)

S&F Galvanised iron strip 32 x 6 mm with saddles and fixing screws etc. for roof conductors and down conductors above ground etc. as required complete all as specified and directed.