MID/AN/05

Carriage of motor (Stator and rotor) from the pump house Rajal to workshop by suitable loading capacity load carrier for safe carriage/transportation to workshop of the firm for complete dismantling of motor which includes extraction of rotor out of stator. Removal of old banding from both ends of the rotor, de-soldering all the 72 connections of the strips to make the strips free to extract from respective slots. Extraction of all 144 Nos. of strips from 72 Nos. of rotor slots. Cleaning the slots with suitable chemical/solvents and rebuilding, reconditioning the damaged slots of rotor and complete rewinding of rotor by way of fabrication, providing and fitting of 144 Nos of new copper strips of similar Electrolytic value /grade in 72 Nos of rotor slots, insulation with new F class insulation material such as glass, tape, mica tape, slot liner, glass tape, wedges of mica etc, soldering of all the 72 connection at both ends of the motor and the connection connecting the rotor winding the rotor cable leads, Applying Bectol Red/Grey varnishing with class F varnish of reputed make, Drying out the rotor at optimum controlled temperature as per standard practice and continuing the process till the standard maximum/required Insulation Resistance Value and Polarization Index test value is achieved, Providing /application of glass fiber resin banding at both ends of the rotor for over-hang portion of the rotor winding, varnishing the bands and providing /fitting in position of rotor connection leads of actual length and specification. Complete job includes the cost of material after deduction of rebate on old material (copper) and labour charges. Complete Job.

Straightening alignment setting of solids shaft of 400 HP,300 KW,6.6 KV, H.T. motor, re-metaling /depositing of metal on worn out portion on N.D.E& D.E of rotor shaft using low heat electrode followed by machining to bearing size, enlarging the bore of the end cover bearing housing on D.E & N.D.E by enlarging the bores of housing. Providing, fabrication and fitting in position of sleeves into the enlarged bores followed by machining /polishing to achieve specified fitment for outer cone of the bearings. The job includes dynamic balancing of the rotor after rewinding on balancing machine. Complete Job

Providing and fitting of copper coils of stator by vacuum pressure impregnation procedure. The job includes de-soldering all the 54 connections of the stator coils to make each coil free for extraction from respective slots. Stripping out all the coils from the stator, checking out all the laminations after proper cleaning of core/slots, making it free from oil/ grease/other deposition and reconditioning of damaged slots/appropriate preparation of the stator for rewinding. The slot portions are to be wedged at the ends, centre and magnetic putty is to be inserted with adequate pressure to enhance flux linkage. Complete rewinding of the stator by way of fabrication of 54 Nos. of new copper coils from the enameled poly mica covered copper wire of suitable gauge size, shape and electrolytic grade 99.9% as per original copper wire used for old original coil. Insulation of coils with the new F class insulation material of high quality such glass fibre or polyester and mica impregnated or glued together with epoxy, polyester amide (polyamide or polyimide), polyurethane or other resins having superior thermal stability, slot liner, slot spacers, glass tape, fine cotton tape, wedges of mica textile etc. Insertion of new coils in 54 No. slots of stator with the help of nomex paper and separator wedges and also insertion of packing /anti vibration blocks and locking the same properly.The coil ends must be rigidly supported and adequately braced with binding rings or tapes to prevent their movement and also absorb shocks & vibrations during excessive over-loads, starting inrush currents and voltage surges. Insulation of all the 54 No. of coils connections after brazing with brazing rods (14% of silver brazing rods) by applying in layers of glass mica tape reinforced by the varnished glass sleeves. Insulating the connections of the stator coil and also cleaning connections connecting the complete stator with CRC2-26/electro. Varnishing the stator with class F Epoxy gel /varnish coat of reputed make and drying out at optimum controlled temperature as permissible in standard practice. Continuing the drying out process till the required IR value is achieved, providing /fitting in position of stator connection leads of actual length and specification. Complete job includes the cost of material after deduction of rebate on old material (copper) also hire charges for deployment of tools &tackles. Complete Job.

Providing and fitting of new bearings in the bearing housings a)29338/C3 Thrust roller bearing b) 6248/C3 Ball bearing Complete job includes the cost of material after deduction of rebate on old material.

Cleaning the top bearing oil chamber with flushing oil & providing and re-filling of fresh lubricating oil of actual specification up to the mark. Complete Job.

Carriage of the motor (rotor and stator) from workshop of the firm to lift irrigation station Rajal, placing of the motor on the motor skirt. Coupling the motor with VT pump half coupling, fitting of slipping assembly, making all electrical connections of motor to LRS, & slip rings, making proper alignment of motor with pump and adjustment thereof, tightening of all nuts, bolts/studs and testing the motor on load for all connected parameters & commissioning for proper operation, Complete Job.

JAI BABA LAL ENTERPRISES

NATIONAL ELECTRO-MECH COMPANY