Reconstruction of feeder bays for Substation 227 from Substation GPP-2, including installation of differential protection with Intertrip function, for power supply cables

LUKOIL Neftochim Burgas AD


Assigned: 2018 / Completed: 2018

Project description

Substations 227 and GPP-2 are located in LUKOIL Neftochim Burgas AD Refinery.


Design Stage:

  • Elaboration of Detailed design for reconstruction of the external power supply of MV S/st 227; configure and calculation of the differential protection settings.

Supply of equipment:

  • 31,5 kA Siemens vacuum circuit breakers; digital differential protection; microprocessor-based protection devices; surge arresters; electrometers; amperemeters; measuring current transformers, secondary commutation equipment; cable trays; fiber-optic cables.

Construction works, installation and commissioning of equipment

  • Dismantle of equipment from 6 kV bays.
  • Reconstruction of two bays in S/st GPP-2 by installation of vacuum circuit breakers.
  • Installation of new microprocessor-based protection devices (ABB make) for input circuit breakers and for bay circuit breaker in S/st 227.
  • Installation of sound and lighting signalization for Switchgear in S/st 227.
  • Installation of differential protection for power supply cables of S/st 227; installation of communication fiber-optic connection between S/st 227 and S/st GPP-2 for the needs of the differential protection.
  • Reconstruction of Auto Transfer Switch (ATS) secondary commutation and logics, for the input bays and for bay circuit breaker in S/st 227. Reconstruction includes installation of fast ATS upon switch-off differential protection and Intertrip signal in S/st GPP-2.
  • Commissioning works: relay protection parametrizing, test of electrical equipment, test of optical fibers, putting all installed equipment under operational use.



Certificate BG          Certificate EN