REPAIR AND MAINTENANCE OF RMU VCB TRANSFORMER AT INS CIRCARS AREA INS VIRBAHU INS SATAVAHANA AND CERTAIN POCKETS OF NAVAL DOCKYARD AREA UNDER AGE EM 1 OF GE U I VISAKHAPATNAM

Amount

M&L for disconnecting carefully electrical connection from both HT/ LT (primary & secondary) sides of the transformer, keeping them at safe side and taking out the transformer indoor/ outdoor type of capacity above 750 KVA to 1250 KVA , 11 KV/ 0.433 KV, step down any make for carrying out complete overhauling which shall comprise of the following:-

a) M&L for lifting, transporting, handling, the transformer to workshop and opening top cover of the transformer by unscrewing nuts, bolts, washers etc. including disconnecting core assembly from HT/ LT bushing and lifting the same gently and taking out from the shell (container/ body) of the transformer.

b) M&L for draining out transformer oil from the above said transformer in the suitable capacity of container /drums and keeping it in safe custody for reuse.

c) M&L for cleaning the transformer body from inside, removing deposited dirt/ sludge/ foreign particles etc. from the bottom/ body of the transformer and drying up the shell from inside before refilling of the transformer oil.

d) M&L for cleaning and washing thoroughly core and windings of the transformer by hosing down with clean dry oil, removing deposited dirt/sludge/foreign particles from the windings/ core, thorough inspection of windings, providing insulations to leads and terminals, heating/ drying/ baking complete carefully and thoroughly inside the heating chamber at suitable temperature to obtain required value of insulation resistance etc. all as directed by Engr-in- charge.

e) Lifting and refixing core assembly inside the transformer shell gently and carefully, connecting primary/ secondary/ Neutral connections to the bushings assembly, fixing of tap change over including tightening of nuts, bolts, washers of the core to reduce humming noise all as directed.

f) Refilling the filtered transformer oil in the shell of transformer complete.

g) Refixing the top cover including replacement of cork sheet/ gasket, tightening of nuts/ bolts/ washers etc. and replacement of breather with silica gel crystal type all as directed by Engr-in charge

h) Lifting/ shifting to the place from where removed and re-installing the transformer including connecting primary/ secondary/ neutral connections etc. all as directed by Engr-in-Charge.

Note:- (i) Any damage to insulators/ bushes/ windings etc. while in the custody of the contractor shall be made good at no extra cost to Department. The serviceability of the transformer shall be checked and confirmed by the contractor before taking into his custody. (ii) M&L for rewinding/ re-insulation of HT/ LT (primary/ secondary) coils, bushes, studs, Transformer oil,cable box, replacement of buchholtz relay/ MOG if any etc will be measured and paid separately.

All as per Item No. 1 herein before but of capacity 500 KVA to 750 KVA

All as per Item No. 1 herein before but of capacity 250 KVA to 400 KVA

All as per Item No. 1 herein before but of capacity 160 KVA to 200 KVA

All as per Item No. 1 herein before but of capacity 50 KVA to 100 KVA

M&L for re-windings of HT distribution transformers of any capacity/ size/ type by strip opening of HT coils ( i .e. Primary coils ) from core assembly safely, unwinding the HT ( i.e. Primary coils) complete, removing the old defective insulation paper, rewindingwith new copper wire of same gauge and existing size together with new DPC insulation to the copper conductor, varnishing of the windings including heating/ drying/ backing complete carefully and thoroughly inside the heating chamber at suitable temperature to obtain required value of insulation resistance etc. all as directed by Engr-in- charge.

M&L for re-insulating of LT strip of transformers of any capacity/ type by insulating with copper strip as per same gauge and existing size together with new insulated materials/ bracings before placing in to the transformer and assembling the coil with new insulation and fitting the coils in the chamber, testing and commissioning the transformer complete all as directed.

Supply and topping up of transformer oil with di-electric strength not less than 50 KV in to the conservator tank/ body tank of the transformer/ OCB/ FRMUs etc at various locations complete all as directed by the Engineer-in-Charge. [Make: Poweroil/ Transol/ Sabitha Chemicals]

Filtration of transformer oil of transformers/ FRMUs installed at various locations to achieve di-electric strength not less than 50 KV at 2.5mm gap as per relevant IS with portable filtration plant, testing of the oil for the di-electric strength before filtration and after filtration complete all as directed by the Engineer-in-Charge.

M&L for replacement of the LT porcelain bushings complete of following capacity distribution transformers of existing transformer make/ size/ type all as directed including dismantling old one.

Above 500 KVA

Up to 500 KVA

M&L for replacement of the LT porcelain bushings complete of following capacity distribution transformers of existing transformer make/ size/ type all as directed including dismantling old one.

Above 500 KVA

Up to 500 KVA

M&L for replacement gun metal drain valves of transformers of following capacities including dismantling old one:- MAKE :- UPADHYAY/ LEADER/ ZOLOTO/ VAG

100 to 500 KVA

600 to 1250 KVA

M&L for replacement of the HT bushing with gun metal rod with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc. complete of following capacity distribution transformers of any make/ size/ type all as directed including dismantling old one.

Above 500 KVA to 1250 KVA

Up to 500 KVA

M&L for replacement of the LT bushing with gun metal rod with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc. complete of following capacity distribution transformers of any make/ size/ type all as directed including dismantling old one.

160 to 200 KVA

250 to 315 KVA

400 to 500 KVA

630 to 750 KVA

1000 to 1250 KVA

M&L for replacement of the LT bushing with gun metal rod with threading & of suitable length/ size all as per existing including metal rings/ bolts/ washers/ rubber rings etc. complete of following capacity distribution transformers of any make/ size/ type all as directed including dismantling old one.

upto 500 KVA

630 KVA to 1250 KVA

M&L for replacement of silica gel in breather of transformers for all as directed.

M&L for detecting HT/LT UG cable faults located in any stretch / depth with cable fault locator consisting of microprocessor based, identification instrument, cable tracer for exact location of under ground cable routes. Notes:- The rate quoted deemed to be inclusive of rental charges for T&P like entire cable fault locating instrument, charges for operator and transportation etc. complete.

Supply and laying or fixing or passing through pipe or in cable ducts, 11000 volts grade XLPE insulated Heavy duty (earthed),screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor 185 sq mm 3 core size including dismantling old one. Make:Nicco/Gloster/Polycab.

Supply and laying or fixing or passing through pipe or in cable ducts, 11000 volts grade XLPE insulated Heavy duty (earthed),screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavy duty) with aluminium conductor 240 sq mm 3 core size including dismantling old one. Make : Polycab/Havells/Finolex.

Supply and fix cable jointing kit for 11 KV grade cable for outdoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 240 sq mm. Make: Birla 3M/ Raychem/ Denson

Supply and fix cable jointing kit for 11 KV grade cable for indoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 240 sq mm. Make: Birla 3M/ Raychem/ Denson

Supply and fix cable jointing kit for 11 KV grade cable for outdoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 185 sq mm. Make: Birla 3M/ Raychem/ Denson

Supply and fix cable jointing kit for 11 KV grade cable for straight through outdoor heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 120 Sqmm to 185 sq mm. Make: Birla 3M/ Raychem/ Denson

Supply and fix cable jointing kit for 11 KV grade cable for indoor terimination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 185 sq mm. Make: Birla 3M/ Raychem/ Denson

Supply and fix cable jointing kit for 11 KV grade cable for straight through outdoor heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured Al conducter cable of size 240 Sqmm to 300 sq mm. Make: Birla 3M/ Raychem/ Denson

Cutting & Cleaning of bushes/small plants, at sub stn incl surface dressing and removing debris to distance not exc 50 mtr complete

Earthing complete with galvanised steel earth plate electrode 60×60cm.× 6mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less'than 1.5 metres below normal ground level, connected to galvanised earth lead wire 4.0mm dia by means of bolts, nuts, check nuts and washers of galvanised iron or steel all as shown in electrical plate No. 5 connected to earthing test point all as specified or indicated including testing on completion

All as per Item No. 27, but using galvanised iron strip 32×6mm as earthing lead complete all as directed.

Supply& fix aluminium strip 25mmx 6 mm coplete wiyh saddles and fixing screws for fitting the strip

Excavating in trenches n. exc. 1.5m wide and n. exc. 1.5m in depth for foundation, trenches for laying cables/ pipe line etc. and getting out in soft/loose soil

Removing excavated materials to a distance n. exc. 50m and depositing where directed at a level n. exc 1.50m above the starting point complete all as specified and as directed.

Returning, filling in including spreading leveling watering and well ramming in layers not exc 25cm in any type of soil complete all as specified and as directed.

Supply and spreading clean dry sand for cable cushioning in trenches complete all as specified and as directed. (Note: Punned thickness only shall be measured)

Supply and laying sub class 'B' bricks of old size (23x11x7cm) laid along alignment of cable as protection to cable in trenches complete all as specified and directed by Engineer-in-Charge

M&L for maintenance of 11KV CT chamber by disconnecting all 3 phase cable connections, extended bus bars and from VCB Bus and taking out from panel mounted position, testing for proper functioning, body leakage, checking & cleaning / decarbonising of all contact points of CT, epoxy body and Bus bars, complete CT chamber using hot blower and CTC solution, applying backlot (Red) solution to the CT body and refixing the same CT to original position, re-connection of all existing cables, extended bus bars, testing complete all as specified and directed. Note:- CT required new shall be measured as supply only.

Maintenance, servicing, cleaning of Busbar chamber of each VCB including connecting bus bar from CT to Bus bar, spout, support insulator, opening of covers, using CTC and clean cloth and hot air blower/vacuum cleaner, checking for any loose contact, tightening of all nuts & bolts, refixing all covers, replacement of defective bus spout complete all as specified and directed Note :- Bus spout required new shall be measured as supply only.

M&L for setting of 3 phase IED of any type/Make from 11kV HT panel, cleaning the contacts , IED configuration , Calibration & Testing of all the measuring & protection devices viz., CTs, Relays and Meters at site. Testing of all the trip functions of the relays after final current settings by simulating fault current by CT secondary injection test set , checking of current transformer , rectification of defects in control wiring for proper tripping of CB during actual system fault conduction through relay & Tripping coil. Adjustment / setting to plug and time multiplier settings of IED to achieve the discrimination in tripping , tune/synchronies upstream breaker relay settings-installation of relay, testing & commissioning etc. complete all as specified and as directed.

Taking down HT switch gear (Vacuum circuit breaker ) of capacity 11 KV 250/350 MVA comprising of following repairs, overhauling, servicing, carrying out preventive maintenance and refixing the same after repairs/ overhauling:

(a) Tripping off the breaker, lowering the breaker with raising/lowering handle and pulling out the breaker complete from the panel along with the trolley for servicing/inspection/overhauling

(b) Servicing/Inspecting/checking of automatic safety shutter operation for serviceability and replacement of spares if required.

(c)Servicing/Inspecting/checking of circuit spout and circuit spout connections for RYB phases and replacement of spares if required.

(d) Dismantling and checking of cross bar assembly, fixed contacts and current carrying parts of the breaker, trolley, insulated assembly and checking lamination with clamps, epoxy spout, isolator assembly etc.

(e) Setting, reassembling, cleaning, adjustment of fixed contacts, main contact, arcing contacts and chamber baffle pot assembly, moving contact for proper setting of auxiliary contacts operating mechanism.

(f) Servicing/Inspecting/checking of secondary sockets/bus bar earthing plugs/earthing sockets and replacement of spares if required.

(g) Checking, setting and adjustment of lowering and raising operation of the breaker trolley.

(h) Decarbonising of bus bar and connected items

(i) Lubrication and greasing of all moving parts of the trolley, stopper bolt for proper operating and closing of shutter gear, isolation resistance of trolley of with vacuum interrupter assembly.

(J) The inspection of HT switch gear shall involve:- (i) Inspection of truck & hoist assembly. (ii) Inspection of tank assembly & barriers. (iii) Inspection of assembly & components of solenoid assembly. (iv) Inspection of assembly & components of dependent mechanism. (v) Inspection of assembly & components of spring box mechanism. (vi) Inspection of motor mechanism spring charge assembly (vii) Inspection of assembly of trip unit & related components

Notes: (i)The servicing includes for bus bar duct chamber, cable alleys and connecting accessories (ii) The rate quoted shall be deemed to include for necessary T&P, nuts, bolts, washers, gasket, insulation tape, compound, painting of VCB panels with approved colour including lettering details all as per existing etc. to put in to the VCBs and panels in serviceable condition, testing and commissioning all as specified and as directed by the Engineer-in-Charge. (iii) Major spares like Breaker bushings, vacuum interrupter assly, bus bar spout, bus bar spout connections, circuit spout/circuit spout connections/buffer fixed contacts, moving contacts, tank assly/barriers, solenoid spares, dependent/spring mechanism/ motor mechanism, trip unit etc. will be measured and paid separately under relevant items of Schedule 'A'. However the rate quoted shall be deemed to include for any other minor spares require replacement. (iv) the servicing shall be carried out by Authorised service centre as approved by GE

M&L for rectification of faults and retrofit of electrical circuit of 11 KV VCB with suitable IED's by checking CT/PT healthiness , proper programming of multifunctional meters and replacement of defective components & wiring with FRLSH multistrand PVC insulated copper conductor 1100 volts grade as per existing size of wire complete all as specified and directed Note :- Required new components will be measured and paid separately under relevant items.

A) VCB Control circuit comprising of the following:-

i) Numerical feeder protection relay - 1 No.

ii) Trip circuit supervision relay - 1 Nos

iii) DC supply supervision relay - 1 No.

iv) High speed tripping relay - 1 No.

v) Auxiliary relay- 1 Set

vi) Multifunction meter, Digital type (Displaying A, V, PF, Hz, KVA, KW, KVAR, KWh, Karsh etc.) Class 1 - 1 No.

vii)Digital Voltmeter , Ammeter - 1 Set

viii)Indication Lamps & Annunciator - 1 Set

ix) Control Switches & Wiring with appropriate colour coding , complete which are required for smooth / satisfactory operation of CRP as per scheme requirement

x) T‐N‐C Switch (Breaker Control Switch) - 1 Set

xi) Circuit label - 1 No.

Supply , install ,Testing , Commissioming of Numerical feeder protection relay 50/51N (Earth over current),67P (3Ph directional over current),67N (Earth fault directional over current), 51V (Voltage controlled over current), 37 (3Ph under current),46 (Negative Phase sequence over current),59N (Residual over voltage),32 (Directional power protection under/over active/Reactive power),81 (Under over over Frequency ), 49 (Thermal Overload),79 (Auto resue),50BF (Circuit breaker failure direction),Cold pickup,Inrush blocking including taking down old relay complete all as specified and directed by Engr-in Charge.Relay will be on Modbus Protocol.(Make:- Schneider of Model Micom P-127 protection relay, 110V, 5A, type-BAOZ112Ca1 or its equivalent in ABB/SEIMENS)

Supply and fixing High Speed Master Trip Relay

Supply and fixing the following for METERING:

Supply and fixing the INDICATION LAMPS for C.B. ON/OFF/TRIP/Trip Circuit Healthy and Unhealthy/Spring Charged

Supply and fixing the following for CONTROL SWITCHES & Control Wiring

T‐N‐C Switch (Breaker Control Switch)

Trip Circuit Healthy Push Button

Control wiring with appropriate colours

Local Remote switch

Supply & fixing closing coil assembly 110 V DC to Schneider make 11KV VCB incl necessary connection testing complete incl dismantling taking down unserviceable one complete all as specified and directed. Make- Schneider, Part No- ECO39SN134900FN

Supply and fixing tripping coil 110 V DC as per site reqirement 11KV VCB incl necessary connection testing complete incl dismantling taking down unserviceable one all as specified and directed.

Supply and fix incl dismantling taking out unserviceable vacuum interrupter of suitable for VCB of capacity 2500 Amps all as specified and directed.

Supply and fix including dismantling taking out unserviceable Breaker Nylon Wheel, For 800A to 2500A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable spring charging Universal motor with gear box 220V AC For 800A to 2500A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Release Lever (Nylon ) For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Buffer (For Opening Spring ) For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Buffer (For Closing Spring ) For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Rectifier unit (Monoblock) for spring charging motor For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

M&L for replacement of damaged space heater, 230V AC supply , 100 watt inside 11 KV HT VCB cable chamber including necessary connection, testing complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable HRC Fuse-Pt HT Side (VTF-11, 3A) For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Control Circuit HRC Fuse : 2 A , 4 A , 6 A , 1 0A complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Service/Test Position Limit Switch 1NO+1NC For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

S&F multifunctional meter with LED display, accuracy class-1, e- navigator, including dismantling taking down unserviceable one and connection, programming, testing complete all as specified and directed.

Supply and fix including dismantling taking out unserviceable Isolating Contact For 800A to 1600A Schneider make 11 KV VCB complete all as specified and directed.

Supply and fix single (Red-Blue) phase bus bar spout suitable for 800 Amps to 1250 Amps VCB . complete all as specified and directed.

Supply and fix single (Y) phase bus bar suitable spout for 800 Amps to 1250 Amps VCB . complete all as specified and directed.

Supply and fix Drive Beam suitable for 11 KV VCB 800 to 2000 Amps. complete all as specified and directed.

Supply and fix Epoxy Body suitable for 11 KV VCB up to 1250 Amps. complete all as specified and directed.

Supply and fix Dive Rod assembly with contact block VG2 suitable for 11 KV VCB up to 1250 Amps.

Supply and fix CT Spout suitable for VCB 800 to 2500 Amps 25 Ka chamber insulating bus support epoxy insulator of dia 95mm and 125mm length complete all as specified and directed.

Supply only Resin Cast CT dual core, CT ratio- 100/50/5A-5A For 800A , 11 KV VCB panel.

M/s NATIONAL ENGINEERING CONSTRUCTIONS CO

M/s.DSRK CONSTRUCTIONS

M.V.K.ENTERPRISES

P VENKATA RAO

B5BUILDING SOLUTIONS

Srinivash Engineers

SRIESWARI ENTERPRISES

ARCHANA ENGINEERING ENTERPRISES