Medium voltage switchgears type PREM-12G SMART

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Purpose

Distribution of three - phase alternating current electrical energy with nominal frequency 50 Hz and nominal voltage up to 12 kV.

Application

  • any place of mine distribution system, in underground mines in mining pits with high degree of explosion hazard, high degree of methane explosion hazard and the degree of coal dust explosion hazard is A,
  • for power supply for outgoings installed in methane and non-methane fields, in mining pits where degree of methane explosion hazard is "a", "b" or "c" and in mining pits where degree of coal dust explosion hazard is A or B,
  • substation of industrial power plants in extreme operating conditions.

General characteristics

  • indoor, air insulated, draw-out switchgear,
  • metal enclosure providing degree of enclosure protection IP 54 and mechanical strength degree IK 10,
  • stationary, free-standing,
  • internal arc resistant,
  • internal decompression of arcing gases,
  • compartments separated by metallic partitions (metal-clad),
  • single busbar system,
  • self-contained or external source of feeding auxiliary circuits,
  • motor-drive mechanism or mechanical control of operating the withdrawable part and the earthing switch,
  • available in various alternatives, depending on the equipment used in main and auxiliary circuits, provided with vacuum or SF6 insulated switching devices.

Features

  • minimum dimensions at the highest rated parameters,
  • modern solutions ensuring safety:
    • double internal decompression,
    • construction of the enclosure ensures a high resistance to internal arc,
    • independently operating metallic shutters,
  • innovative locking system that prevents violation of operating rules,
  • fast shutdown system increasing safety for operating personnel and equipment,
  • operation reliability provided by suitable switching devices and modern digital protection units,
  • possibility of cooperating with a digital system for visualization of operating and emergency conditions, remote surveillance and control of power equipment and systems,
  • minimum maintenance resulting in short work stoppage,
  • automatic power supply changeover and standby switching as an integral module of a concentrator, without the necessity of incorporating additional equipment to perform these functions,
  • professional manufacturer's service,
  • easy extension.

Front view and cross-section outgoing feeder

  1. Elewacja i przekrój pola odpływowego By-pass circuitry channel
  2. Draw lead bushing
  3. Bushing with contacts
  4. Busbars
  5. Withdrawable part
  6. Metallic shutters
  7. Pressure relief flaps
  8. Current transformers
  9. Ferranti Earth-fault Current Transformer
  10. Earthing switch
  11. Motor drive mechanism of the earthing switch
  12. Protection equipment relay system
  13. Back door of the cable compartment
  14. Motor drive mechanism of the withdrawable part
  15. Cable gland
  16. Rear cover of the busbar compartment
  17. Cover of decompression compartment
  18. Withdrawable part compartment door
  19. Auxiliary circuit compartment door
  20. Front door of the cable compartment
  21. Partition plate
  22. Upper cover of the busbar compartment

Legenda Legenda

Technical data

Type of the switchgear PREM-12G SMART
Rated voltage kV  7,2 / 12
Power frequency withstand voltage kV  20 / 28; 421)
Lightning impulse withstand voltage kV  60 / 75
Rated current:   
normal of main busbars
normal panel
short-time withstand current
peak withstand current
A
A
kA/s
kA
up to 1250
up to 1250
up to 25/3
up to 65
Internal arc withstand current kA/s 25/1
Rated frequency Hz 50 
Degree of protection   IP 54
Resistance to mechanical impacts   IK 10
Dimensions of panels:    
width [A]
height [B]
depth [C]
mm
mm
mm
600
1800
1300
Internal Arc Classification   AFLR
Partition class   PM
Loss of Service Continuity Classification   LSC2B
Compliance with standards   PN-EN 62271-200; PN-EN 62271; PN-G-42050; PN-G-50003
1)Acocording to the GOST standards

Exemplary schematic diagrams

schematy

Product card in pdf format PREM-12G SMART plik.pdf

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