Rewinding
of HV AC Induction motor SATOR Make :MITSUBISHI, KW:
2620kw, Volt : 6900 V, AMP: 290A, RPM : 393 SL.NO. 4G1201A0703
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- Dismantling
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Stripping of Coils
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Analysis of failure
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Cleaning of the stator slots without disturbing
the core properties
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Core testing for hot spots
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Core repairs
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Collecting the dimensions of slots
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Checking of newly manufactured Resin rich/VPI
coils
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Insertion of Coils
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High Voltage testing of Coils while insertion
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Connections & Banding
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Testing prior to Varnishing
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Varnishing
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Cleaning of excess Varnish
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Assembly testing and Painting.
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2628KW,
13800V, 900 RPM, GEC U.K. MAKE GENERATOR STATOR CORE REPAIR
& REWINDING OF STATOR & ROTOR
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Dis-assemble
and inspect the Generator
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Completely strip stator, clean slots and record
data.
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Carry out flux loop test on bare stator core
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Rewind stator with new “F” class Resin
Rich coils
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Install new 6 Nos. of RTD’s
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Dry out stator in air-circulating oven.
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Apply epoxy varnish in the winding
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Bake the winding in air circulating oven.
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Check Insulation resistance of winding, High Voltage
and Impedance test on Stator.
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Dynamic Balancing of rotor
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Assemble the motor with new bearing. Test, Paint
and Deliver back
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50
MVA 132/11 KV ABB MAKE TRANSFORMER REPAIR AND REFURBISHMENT
FOR ALBA
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Removal
of active part from the tank
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Destacking of lamination and removal of connections
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Removal of damaged Coils from the Active Part
(weight per Coil is 3.5 tons)
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Insertion of new coil supplied by ABB
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Restacking Of core lamination
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Reconnecting the leads to the tap changer
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Tanking the active part
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Testing and oil treatment
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Erection & Commissioning
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Rewinding
and CORE repairing of HV Generator Stator 3285 KVA 13800
Volts FOR SCECO –SAUDI ARABIA
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Removal
of grounded formed coils from the stator slot
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Dismantling the lamination from the yoke
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Prepare appropriate jigs and fixture and break
open the pressure plate
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Remove laminations one by one
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Analyse the cause of failure
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Clean the entire core lamination to remove the
existing lacque
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Varnish the lamination to the required finish
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Restack the lamination
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Press the laminations to appropriate pressure
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Weld the pressure plate on to the supports
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Test the core for hot spots
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Rewind the stator with new resin rich formed
coils
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Varnish bake and test
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Assembly
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2480KW
6900V JEMOUNT MAKE MOTOR CORE REPAIRING FOR QATARGAS
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- Scrutinise
the cause of failure
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Dismantle the core from the yoke of stator
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Carry out dimensional checks on the stator and
prepare drawings
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Fabricate jigs and fixtures as per the dimensions
of the slots and align the same for proper fi
of laminations
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Break open the pressure plate and remove laminations
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Check the cause of hot spots
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Clean the lamination with special solvents without
disturbing its properties
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Clean the laminations from any foreign particles
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Varnish the laminations to the required thickness
and finish
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Restack the core to the required dimension
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Pressurise the core with require pressure for
accurate seating at required stages
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Insert the pressure plate after the final stack
of laminations are inserted
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REWINDING
AND CORE REPAIRING OF ROTOR-3125KVA 13800 V GENERATOR
ROTOR
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- Removal
of entire rotor laminations
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Cleaning the laminations
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Varnish the lamination with core plate varnish
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Inserting the lamination back to the normal position
without disturbing the slots
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Insert damper windings made of aluminium conductors
10mm diameter through the poles
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Weld the conductors to the short circuiting end
rings
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Rewind the rotor with F class insulated strip
conductors
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