Work

Amount

OVERHAULING OF DRIVE IN 245 KV SF-6 CB CGL Make of 160 MVA-2 Transformer

Descripition of Work as Following for overhauling of 245 KV Circuit breaker :-

Dismantling Work

Dismantlling of drive from CB

Removal of auxillary swicth/cable and Cable of magnetic ventile

D coupling of drive from pole (couping stud)

Unscrew of threading rings unscrew of drive base aluminums hex nut

Removal of dive base

Removal of damping piston

Dismantling of closing inter lock dismantlingof magnetic ventile

Dismantling of solonoid , trip 1, trip 2 and closing coil

Cleaning of all assembly accessories.

Lubricant and fixing of K slot ring and all O ring and replacing the same if required.

Assembly of drive closing interlock & magnetic ventile

Installation of drive with pole column auxlliary switch closing interlock, magnetic ventile.

Filling of air pressure after installation of drive and attending air leakage in overhauled unit if any.

Check Close/Trip timing by digital timer.

Checking of on/off operation and recording operating timing & conducting CRM test on the breaker. Closing & tripping coils (Trip 1 and Trip 2) material will be provided from UPPTCL

Overhauling of 145 KV SF6 CB CGL Make at 220 KV S/S Gokul (132 kv Mathura-II Bay, LV of 160 MVA-II Bay and 132KV Maanth bay) and 132 KV S/S Aurangabd (132 Kv Agra south Bay, 132 KV Railway II bay,63 MVA Transformer 1st Bay)

Descripition of Work as Following for overhauling of 145 KV Circuit breaker :-

Dismantle all top covers from pole units and opening of fixed contact chamber from pole unit.

Cleaning of all fixed & moving contacts, polishing the contacts and applying micro carbon grease on contact surface.

Replace all the O ring absorbant and re-fitting the same.

Apply Vacuum in all poles by help of vacuum pump upto specified value and keep it for 4/5 hour & check no loss of vacuum.

Complete overhauling of Spring charging Mechanism assembly, cleaning & lubrication.

Dismantling of close & trip coil assembly, opening its parts, cleaning, lubricating and adjustment of air gap of this plunge.

Checking electrical connection in the marshalling box and tightening all electrical connection.

Check Close/trip operation of this breaker satisfactory.

Check Close/Trip timing by digital timer.

Replacement of Main NR with Pipeline (if required) work consist of dismantling of Main NRV with pipeline & replace it with new one & fitting at its original place in CB . SF6 gas filling in all poles at desired level for satisfactorily completion of work.

Overhauling of 33 KV VCB of 33 KV Madora Bay, 33 KV Mathura Cantt Bay at 220 KV S/S Gokul & 33 KV Shergarh at 132 KV S/S Manth & LV of transformer 2nd, jack bus 1 at 132 kv Substation Aurangabad, 33 KV Kotwan, 33 KV Chhata at 132 KV S/S Kosikalan.

Descripition of Work as Following for overhauling of 36 KV Circuit breaker :-

Repair & complete overhauling of 33 KV VCBs of different make work include replacement of its defective parts along with material like pin,bush,bearing & washer etc and checking of its operating mechanism for smooth running. Removing the defect of wiring for proper operation of breaker. Cleaning of all parts and oiling & greasing for satisfactory operation of VCB.

Checking & adjustment of snatch gap, travel of drive insulator rod & tie rod of each pole.

Opening & closing time of breaker of each pole.

Replace all the O ring absorbant and re-fitting the same.

Checking of Megger values of breaker poles.

Check Close/Trip timing by digital timer.

Checking the CLOSE/OPEN operation of breaker from REMOTE & LOCAL and rectification of wiring fault, if any.

Providing & Fixing of spring charging motor (230V AC) with assembly of 36 KV CB make Stelmec & ABB Make with fully satisfaction Supervising Engineer.

Dismantling of spring charging motor make (ABB) from operating mechanism . After dismantling rewinding of spring charging motor with super enameled copper wire & replacement of internal small gears of motor for smooth operation. After rewinding of spring charging place & check the operation of motor by electrically.

P&H Engineering

M/S A K ELECTRICAL

MEERA GYAN ENTERPRISES

SWITCHGEAR AND TRANSFORMER CARE CENTRE

TIRUPATI ELECTRICALS

Technocrat Electrical