workshop

Repairs, overhauls, upgrades:

Karsten Moholt AS has 70 years of experience with electrical machinery.

 

 

Our workshop on Askøy  is one of the best in Norway regarding maintenance of  low and high voltage motors, and can perform everything from minor overhauls and repairs to large, sophisticated maintenance projects.

Our workshop capacity:

Machines for lifting, moving and disassembling of equipment:

- Cranes with lifting capacity up to 100 tons

- Forklifts with lifting capacity up to 16 tons.

Equipment used for cleaning and impregnation and coating equipment:

- Cleansing tank with dimension 3,5  x 2,5  x 1,5 m

- Drying Ovens with dimensions up to 5 x 3,3  x 2,4 m

- Vacuum pressure tank with a diameter of 4 m and depth of 4,5 m

- Mobile VPI tank with a diameter of 1 m and depth of 1,2 m

- Vacuum drying oven

- Separate workshop for sandblasting

- Separate workshop for surface treatment Norsok M501 a/b,       (zinc  treatment and metallization)

Machines for mechanical processing:

- Machining bench up to 1400 mm turning diameter

- Pillar Drills

- Electrical saw for metal with a diameter up to 450 mm

- Welding Equipment AC and DC

- Metal Spraying

Equipment used in the overhaul process:

- Glass Blowing Machines

- Hydraulic presses up to 200 tons

- Industrial high pressure cleaners with temperature

- Balancing pit up to 25 tons and 12 meters

- Balancing  of rotating equipment on site, unlimited size

- Bearing induction heaters with a diameter up to 330 mm

- Cryogen dry ice blast machine for cleaning windings

Machinery and equipment used for test run and condition monitoring:

- Designated test drive system with the following specifications:

- Test run with load capacity up to 1200 kW

- Separate test system documentation of efficiency to be repaired or reconditioned equipment

- Documentation of loss, temperature  in repaired or reconditioned equipment

- Provides DC, 50Hz and 60Hz

- Continuous adjustment of test voltage between 0 - 6000V , 0-60 Hz

- Equipment for high-frequency extension turns control 0 – 12 kV (Surge test)

- Equipment for detection of damaged rotor bars and  short circuitrings

- Pressure testing of heaters to 100 bar

- Pressure-test of coolers

- Separate test drive facility for pumps with verification of characteristic

- Separate test drive system for forklifts

- Laser alignment equipment (Pruftechnik)

- Vibration analysis instrument ( PRUFTECHNIK , VibXpert )

- IR camera ( FLIR )

- Capacitance testing of batteries

- Equipment for testing of machine protection equipment

- Power quality analyzer

Equipment used for rewinding:

- Winding Machines for the production of low voltage winding AC and DC coils

- Burnout ovens with size up to 5 x 2,2 x 3 m

High voltage insulation testing of Rotating and static machinery:

- High voltage insulation testing of motor/generator windings:

- Tanδ ( TD ) > 30kV ( 50 Hz ), 44 kV ( 0.1 Hz )

- Partial discharge ( PD ) > 30kV

- nsulation resistance ( IR) > 60kV DC

- Polarization Index ( PI ) > 60kV DC

- Equipment for permanent and sporadic online Partial Discharge (PD) monitoring

High voltage insulation testing of cables:

- VLF > 44kV AC ( 0.1 Hz )

- Tanδ ( TD ) > 44kV ( 0.1 Hz )

- Insulation resistance ( IR) > 60kV DC

- Polarization Index ( PI ) > 60kV DC