Project Conception.

• RETROFIT Project involves replacement of outdate commutation apparatus with service time longer than nominal by vacuum circuit-breakers of BP series.
• Some elements of the switchgear, like enclosures, mechanisms of earthing switches, disconnectors, section busbars, etc.) stay the same.

Withdrawable Unit.

• Replacement of the old withdrawable unit with the new one equipped with vacuum circuit-breaker.
• Advantages:
  • Quick-to-replace
  • Replacement is less labour-intensive

Use of vacuum circuit-breakers allows the replacement of circuit-breakers without remounting of control and relay protection in the switchgear.

• RETROFIT Program Advantages:
  • RETROFIT costs 30-40% of new switchgear cubicle cost;
  • Operation resource of a vacuum circuit-breaker is 15 – 20 times higher than the resource of oil apparatus
  • Minimum maintenance cost
• METHODS OF RECONSTRUCTION:
  • Withdrawable Unit.
  • Universal Module.

Universal Module.

• Replacement of the old unit with the module equipped with vacuum circuit-breaker.
• Mounting of the module on the old withdrawable unit.
• Advantages:
  • The price of the module is lower than the price of the withdrawable unit
  • Replacement is more labour-intensive