MAINTENANCE AND REPAIR OF 132 11 KV TRANSFORMERS, CONTROL PANELS, RELAYS, CABLES, COPPER EARTHINGS AND ALLIED WORKS AT MRS AT NAVAL DOCKYARD, VISAKHAPATNAM UNDER GE (I) DM VISAKHAPATNAM

Amount

M&L for following Transformer oil evaluation as per IS: 1866-2017 from Laboratory having accredited by NABL (Govt. of India) (i) Dissolved Gas Analysis (DGA) as per IS: 9434-2019, IS: 10593-2018 & IEC 60567, (ii) Acidity, (iii) water content, (iv) Sludge, (v) Die electric dissipation factor, (vi) Specific registance, (vii) Flush point, (viii) Density (ix) Apearence, (x) Electric strength, (xi) Interfacial Tension of transformer oil of 132/11 KV transformer by taking out at 5.0 ltr SS Container and transporting to govt approved lab at Visakhapatnam or at near by Cities including submission of test report.

M & L for filtration/dehydration transformer oil of transformer voltage grade 132/11 KV, capacity 20/25 & 10/16 MVA outdoor type, floor mounted in situ till achieve dielectric strength minimum 60 KV at 4mm gap all as specified and directed.

M & L for topping up/replacement of transformer oil with new transformer oil suitable for working voltage 132/11 KV grade in main tank and OLTC including necessary dehydration to achieve dielectric strength min 60 KV at 4mm gap complete all as specified and directed. Make – GULF/Castrol/ HP /IOC /Savita /Power.

Note for item No. 1.00 to 3.00 :- (a) New transformer oil to be bought in company sealed ISI marked container with test certificate and cost of container & transportation & lab test shall be inclusive of the quoted rate (b) Filtration /dehydration of transformer oil shall be carried out at the location where transformer is installed and required pipe connection from filter machine to transformer shall be made and rate shall be inclusive of quoted rate. (c) Necessary filter/dehydration plant having pressure gauge, hour meter, temperaturature gauge to be brought at site by contractor and to be kept permanently inside ND (V) till completion of work and rate deemed to be included in the quoted rate. In any condition, in-out of the filter machine during the progress of the work will not be allowed. (d) Transformer oil test report before and after dehydration/filtration shall be submitted duly authenticated by authorised person .

M & L for replacement of silica gel grains in the breather assembly of transformer complete all as specified and directed.

M & L for replacement of breather assembly made with polycarbonate base and clear acylic glass of size to accommodate 2.0 kg of silica gel for transformer complete all as specified and directed.

M&L for maintenance/servicing of 132/11 KV transformer OLTC at 132kV side by 1.⁠ ⁠Complete draining of oil into a tanker. 2.⁠ ⁠Dismantle of mechanical tap driving parts. 3.⁠ ⁠Opening of inspection cover plate. 4.⁠ ⁠Checking of internal tap leads and marking accordingly. 5.⁠ ⁠Disconnection of tap leads from OLTC fibre chamber. 6.⁠ ⁠Loosening of Nuts at OLTC bottom plate. 7.⁠ ⁠Tightening of jack bolts. 8.⁠ ⁠Lifting the OLTC fibre chamber to a minimum of 1 foot. 9.⁠ ⁠Cleaning the old gasket area and cutting a new gasket (RC 70C). 10.⁠ ⁠Pouring of silicon paste and replacement of new gasket. 11.⁠ ⁠Tightening all nuts at bottom of OLTC. 12.⁠ ⁠Connection of all OLTC tap leads to the same place as marked. 13.⁠ ⁠The same procedure follows for remaining 2 phases also.

14.⁠ ⁠Closing the inspection cover with new gasket. 15.⁠ ⁠Dry air to be pushed with dry air generator into the transformer or can push nitrogen gas to maintain dew point. 16.⁠ ⁠Checking for any leakage. 17.⁠ ⁠If any other leakage then arrests the leak. 18.⁠ ⁠Vacuuming the transformer. 19.⁠ ⁠Check oil BDV. 20.⁠ ⁠Oil filling. 21.⁠ ⁠Filtration of transformer oil. 22.⁠ ⁠ Routine tests like voltage ratio, magnetic balance, vector group, IR value and PI need to be conduct before energising the transformer 23.⁠ ⁠Charge the transformer for 4 hours Ideal and then load up to 30 % load for 4 hours. Note: (a) Minimum 30 KL tanker required. (b) ⁠Hydra required. (c) ⁠Filter machine required. (d) ⁠Dry air generator or Nitrogen cylinders required. (e) 10-12 mm SRC gaskets (f) Transformer oil shall be measured separately (g) Necessary Tanker to be arranged by the contractor before draining the oil from transformer.

Periodical cleaning of complete transformer outer surface including 132 KV bushings, radiators, marshaling tank with volatile cleaning agent at every alternate 3 month to keep the complete outside surface dry and clean all as specified and directed. Note : Each job measured in one quarter as one unit.

M&L for painting of old painted yard steel structure/MS laddder surface of tower lights with one coat of red oxide and two coat of synthetic enamel paint complete all as specified and as directed

Material & labour for cleaning of 132 KV outdoor kit, removing all dirt and dust accumulated inside fins with suitable cleaning agent cleaning of complete mounting MS structure and painting the supporting structure with one coat of aluminium paint opening and reconnection of all earth terminals after cleaning jointing surfces complete all as specified and as directed.

M&L required for servicing & maint of 132KV, horizontal double break isolators "GRPS" make, 132 KV, triple pole, 31.5 KA centre post rotating horizontal double break type isolators suitable for upright mounting with manual operated mechanism for main switch and earth switch (i.e. mechanically gang operated) with all accessories required for normal operation of the isolator, but without support insulators, without supporting structure and without terminal connectors with following configuration (copper design) : - a) For 800 Amps with one earth switch. b) Support insulators for the above isolators. One stack consisting of 325 KV having a creepage distance of 4495 mm and cantilever strength of 6 KN as manufactured & tested (31mm/KV) (Per No.). c) Terminal connectors for the above isolators a set of 06 Nos. Rigid type bimetallic terminal connectors suitable for single ASR Zebra conductor all as specified and directed.

M&L for complete opening of ACSR conductor after opening aluminium pad clamp by removing nuts, bolts from 132KV yard lightning protection conductor decarbonizing all contact surface of ACSR, replacement of unserviceable aluminium PAD clamp suitable for panther ACSR conductor and 132KV Air break switch / Lightning arrestor terminal all as specified and directed

Maintenance, servicing,Testing of following IED's fitted on 132KV control relay panel as per checklist which mainly include disassembling various parts (if necessary) to check for healthiness, cleaning, tightness checks, functional & protection checks with automatic Secondary injection relay test kit having six channels to be used to carried out healthiness checking of entire protection circuit, metering circuit and functional checks of all auxillary relays and overall control devices like TRIP/N/CLOSE switch, LOCAL/REMOTE switch & its's controls to be checked complete all as specified and directed. Note : Replacement of defective parts shall be measured and paid separately.

Transformer Diffrential relays P632

Over current earth fault relays P141

Distance/Cable diffrential relays P442

Bus bar diffrential relays P746

M&L for THERMOGRAPHIC TESTING of 132kV switch yard with IMAGE INFRARED CAMERA to detect Hot spots, to avoid electrical failures and increase safety for all current-carrying devices. Visual and mechanical inspection to be done when load is applied to the system. Use & follow appropriate caution, safety devices, and personal protective equipment. Provide a report which includes the following, all as specified and directed. 1. Description of equipment tested. 2. Discrepancies if any. (HOT Spots). 3. Identify load conditions at time of inspection. 4. Provide photographs and/or thermo grams.

M&L for complete checking of trip circuit from transformer marshalling box control panel to relay control panel for ensuring proper functioning of all trippings like buccholz, winding & oil temp, OSR, PRV and OLTC circuit and making necessary repairs (if necessary) of all contacts points, checking of forced air circulation system with rise in oil/winding temp, replacement of necessary relays, contactors complete all as specified and directed.

Supply and fix/retrofit of latest updated version of Schneider Numerical relay in place of Schneider Micom P-127 protection relay, 110V, 5A, type-BAOZ112Ca1 to Schneider make 11KV VCB including dismantling taking down unsv one and including testing/checking of all other parameters of relays for proper tripping order all as specified and directed.

Supply and fix Schneider High speed trip relay, type-VAJH, 110V to Schneider make 11KV VCB incl necessary connection testing complete incl dismantling taking down unsv one and including testing/checking of all other parameters of relays for proper tripping order all as specified and directed.all as specified and directed.

M&L for dismantling & taking out radiator cooling fan from its mounting position , transportation from yard to to civil workshop outside ND (V) for re winding of heavy duty 3ph exhaust fan after opening complete motor assy, bearings, bushings, removal of burnt copper wire, cleaning of core, inserting proper insulating paper in slots, winding with and as per existing size/turn of super enamelled copper wire, heating, vernishing, replacement of unsv bearings / bushings / capacitor pad / connector block, connection wire 3 core, assemble of rotor and stator unit with capacitor, connecting wire, capacitor pad, down rod, blades complete all as specified and directed.

Material & labour for preparation of surfaces by scrapping and removing old painted surface with wire brush and applying white wash to wall/coping/Plinth protection area, Earth pits of MRS bldg/GIS bldg complete at alternate 60 days all as specified and directed.

Supply and laying of following armoured control Cu cable from 132kV transformer marshling box to individual control panel feeder including sadaling,laying on cable tray/trench,glanding, termination with detailed ferrule & appropriate cu Lugs complete all as specified and directed. Make: KEI / Polycab / Cable Corportaion

4 Core , 2.5 Sqmm

4 Core , 4 Sqmm

18 Core , 1.5 Sqmm

3 Core , 2.5 Sqmm

7 Core , 2.5 Sqmm

5 Core , 2.5 Sqmm

Supply and fixing of 60kV 10kA Station Medium Duty (SM)(Old Line Discharge Class-III) as per IEC 60099-4 of 2014 & IS:15086 (part-4) of 2017 With Qrs= 1.6C & Wth= 7kJ/kV Gapless Type Surge Arrester Comprising of Metal Oxide Elements housed in FRP CAGE ‘DESIGN B’duly moulded with Silicone Polymer to be used on a Nominal System Voltage of 66kV and Maximum System Voltage.of 72kV with an MCOV of 51kVrms, With Insulating Base & Surge counter, Connecting lead of 35Sq.mm Cu.Cable of 2 meter length & Terminal connector suitable to Single ACSR Conductor. Creepage Distance: 25mm/kV Model-PBC Pressure Relief [email protected] Cantilever Strength-150kgf. Nominal Voltage : 132kV Highest System Voltage : 145kV (As per CEA Guidelines,TTRs are Validity is 10Yrs) all as specified and directed. Make : Oblum Electrical Industries Pvt. Ltd or equavalent

M&L for taking down safely unserviceable/ burnt existing power conductor from the structure after disconnecting the unserviceable pad clamps and rusted nuts & bolts and supply, installation of new moose ACSR conductor in place of existing conductor and make it operational all as specified and directed.

Taking down unserviceable/burnt clamps from the yard structure after disconnecting from conductor by carefully removing rusted nuts & bolts and fixing the following :- (i) Aluminium T clamps - 9 Nos (ii) Aluminium Pad clamps - 9 Nos (iii) Aluminium Gripper clamps - 3 Nos (iv) Aluminium Back clamps - 3 Nos to to hold SRC insulator.

Dismantling and taking down unserviceabe SRC insulators of 132KV rated and supply of 132KV/120KN tension composite insulator with the following specifications :- (i) Length - 1460mm (ii) Big disc diameter - 165mm (iii) Small disc diameter - 109mm (iv) No. of sheds - Big 15, Small 28 (v) Creepage distance - 4495mm (vi) Arcing distance - 1318mm

MURALI KRISHNA ASSOCIATES (BID ID -3188023)

M/S CHANDRA ENGINEERS AND CONTRACTORS (BID ID -3188325)