Maintenance

Transformers

  •     Replacing pumps, coolers, fans and radiator assemblies
  •     Cleaning or replacing bushings
  •     Replacing gauges
  •     Internal inspection and repairs
  •     Re-gasketing
  •     Load Tap Changer servicing
  •     Electrical testing
  •     On-site painting
Circuit Breaker Service
  • Upgrades to electronic trip units
  • Circuit breaker disassembly, cleaning and lubrication
  • Circuit breaker primary and secondary injection test
  • SF6 refill
  • Circuit Breakers Repairs
    In most cases, breaker failure is misdiagnosed as a transformer related problem. This is common for GSU units at windmill generation systems. Our technicians perform preventive maintenance and on-site testing in accordance with manufacturer specifications.
  • Services include:     Cleaning
        Lubricating moving parts
        Burnishing and adjusting contacts
        Repairing or replacing faulty subassemblies
        Breakers retrofitting

More extensive repairs may require taking the faulty item to our repair facility. TSI maintains in its inventory a limited supply of circuit breakers and associated parts.

Kew Power Limited has annual capacities in producing 2500 MVA/year of Distribution transformers or equivalent to 2500 units of 1000 kVA/year and 5000MVA/year of Power transformers or equivalent to 168 units of 30MVA/year.‚Äč

Oil Processing and Analysis

Oil Processing
Kewpower Engineering Company Limited. has developed a highly specialized program for oil purification and reconditioning. With our mobile oil processing systems we can provide oil filtration services for transformers of any size throughout a large geographical area. Oil quality is enhanced through:

  •     Removal of water vapors (free stand or oil dissolved)
  •     Removal of particulate material
  •     Acid neutralization
  •     Degasification: remove dissolved gases such as Ethane, Methane, Hydrogen, Acetylene,Ethylene, Carbon Monoxide and Carbon Dioxide

We use the latest technology and equipment to meet or exceed industry performance standards set by the National Emergency Management Association (NEMA), and the Institute of Electrical and Electronics Engineers (IEEE).

Sampling & Analysis
As transformers age, gaseous and liquid contaminants dissolve in the dielectric fluid and can lead to failures or shorten the life of equipment, unless detected and treated early. Sampling and analysis of dielectric fluid is the key to an effective transformer preventive maintenance program. Sampled transformer oil is analyzed periodically using gas chromatographs, spectrometers, and other specialized testing equipment. Test results show the types and amounts of contaminants and how they have changed from year to year. Contaminants occur as a result of aging, overheating, leaks, or other performance problems.

When the oil samples are collected, a complete visual inspection of the transformer is also performed. Leaks, cracked bushings, inoperative gauges, low oil levels and other defects are identified and noted. Nameplate and other operational data are recorded to help develop maintenance recommendations. A transformer engineer reviews the inspection reports and test results, analyzing prior performance history, usage and age of the transformer. A written report and trend analysis of the sample results, visual inspection, and maintenance recommendations are provided to the customer.