Upgrade & Modernization

SWTS inherited a wealth of experience in Upgrade and modernization of key electrical components from Westinghouse’s Engineering Service Division (ESD).

Automatic Voltage Regulator (AVR):

  • Retrofit old or obsolete Automatic Voltage Regulator (AVR) into modern Solid State Electronic AVR.
  • Retrofit old Rotary Excitation System to modern Static Excitation System.


  • Eliminate excitation DC generator
  • Better response to voltage sag due to motor starting
  • Reduced maintenance
  • Increase plant availability


Voltage Regulator:

  • Retrofit old or obsolete Magnetic Amplifier Type Voltage Regulator to modern electronic Automatic Voltage Regulator for Generator.


  • Better voltage tolerance
  • Faster voltage response
  • Reduced maintenance
  • Eliminate obsolete and expensive parts
  • More reliable operation


Protective Relay:

  • Retrofit old or obsolete Protective Relay to modern Microprocessor Based Protective Relay System with optional upgrade to Bus Auto Transfer Scheme.


  • Prevent nuisance tripping
  • Communications capability
  • Improve tripping time, no impact on production
  • Increase plant availability


SCR Drive Retrofit:

  • From existing DC and SCR Drive and DC Motor to AC VFD Drive and AC Motor.


  • Obsolete and expensive spare parts
  • Unreliable
  • Frequent Failure
  • High Harmonics
  • Electrical and Electromagnetic Interference (EMI)


  • Retrofit to state of the art VFD and AC Motor
  • Engineering study of existing DC Drive and Motor
  • Engineering Design of VFD and AC Motor to suit existing mechanically driven load


  • Lower Losses
  • Cost Savings
  • Lower Harmonics Content
  • Eliminate EMI
  • More Reliable
  • Eliminate Breakdown and Down Time
  • Maximize Production Time


Circuit Breaker And Motor Starter

  • Retrofit of bulk oil circuit breaker, minimum oil circuit breaker, air circuit breaker and contractor to vacuum circuit breaker and contractor.


  • Prevent sudden failure of old circuit breaker
  • Cost is only a fraction of the price of a complete switchgear and cable replacement
  • Retrofits can be carried out with minimum downtime and disruption to load
  • Circuit breaker life can be extended for another 20 to 30 years
  • In the case of frequently switcher circuit, vacuum contractor can be used in place of circuit breaker
  • Protection and control system can be upgraded to include state-of-the-art technology using automatic transfer scheme and microprocessor based protective relays
  • Modern switching devices are virtually maintenance free
  • Progressive retrofits generate a valuable source of spare parts for breakers and mechanism retained in service
  • Eliminate stocking of obsolete parts