Switchgears for mining industry PREM-G1dM series

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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

  • total safety for personnel even in case of violation of operation rules,
  • total safety for personnel even in case of violation of operation rules,
  • internal decompression increasing safety for operating personnel and equipment,
  • design option providing increased resistance to arc fault and its effects, with an additional pressure release duct mounted on top of the assembly,
  • 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,
  • small overall dimensions and compact design of switchgear,
  • 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 service provided by the manufacturer,
  • easy extension and possibility of adding PREM-G1dM panels to PREM-G1 or other type switchgear,
  • the biggest number of feeders installed underground in the range of medium voltage draw-out switchgear systems.

Front views and cross-sections incoming and outgoing feeder

Cubicle of switchgear with auxiliary circuits compartment in withdrawable versionCubicle of switchgear with auxiliary circuits compartment in withdrawable version Cubicle of switchgear with auxiliary circuits compartment in stationanry versionCubicle of switchgear with auxiliary circuits compartment in stationanry version

a withdrawable part in test position Cubicle of switchgear with cable connectiona withdrawable part in test position Cubicle of switchgear with cable connection

  1. channels for auxiliary circuits
  2. pressure relief flaps
  3. auxiliary circuits connector
  4. busbars
  5. busbar bushing
  6. bushing of the tulip joint
  7. contact of the tulip joint
  8. withdrawable part
  9. withdrawable part operating mechanism
  10. shutters
  11. current transformer
  12. voltage transformer or auxiliary transformer
  13. earth-fault transformer
  14. quick-action earthing switch
  15. earthing switch drive
  16. cable gland
  17. withdrawable part compartment door
  18. auxiliary circuit compartment door
  19. front cover of the cable compartment
  20. rear cover of the cable compartment
  21. rear cover of decompression chamber
  22. cover of the busbar compartment
  23. foundation frame
  24. protection equipment relay system
  25. operating crank of the withdrawable part
  26. modular pressure release duct (option)
    limit switch
    optic sensor (option)

Technical data

Type of the switchgear PREM-G1dM
Rated voltage kV  7,2/12
Power frequency withstand voltage kV  20/28
Lightning impulse withstand voltage kV  60/75
Rated current:   
normal of main busbars
normal cubicle
short-time withstand current
peak withstand current
A
A
kA/s
kA
up to 1600
up to 1500
up to 31,5/1
up to 80
Internal arc withstand current
without decompression duct
with decompression duct

kA/s
kA/s

20/0,36; 25/0,15
25/1
Rated frequency Hz 50 
Degree of protection   IP 54
Mechanical strenght degree   IK 10
Dimensions of cubicles:    
width
height
depth
mm
mm
mm
600, 750
1850, 2000, 2100
1450, 1700
Internal Arc Classification   AFLR
Loss of Service Continuity Classification   LSC2B
Compliance with standards   PN-EN 62271-200; PN-EN 62271; PN-G-50003

Exemplary schematic diagrams

Product card in pdf formatSwitchgears for mining industry PREM-G1dM series plik .pdf

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