7.5MVA trailer mounted substation

Incoming section

25kV switch including:

• 3 phase busbar 600A with 2-hole connection
• 25KV isolator
• 3x phase protection CT connected to the protection relay of the PTO compartment
• 1x 25kv output receptacle
• Kirk key interlock set, on each door compartment
• 1x 25kv 250A load break switch
• 1x grounding bar for the arcing contact of the load break switch
• Interlocked with the load break switch (preventing closing/grounding when the system is live)
• 1x switch operation handle with padlock provision
• 1x electrical auxiliary contact on the LBS, to open the ground check circuit for the load (open ground check loop of the load when the switch opened)
• 1x 27kV 600A Tavrida breaker
• 1x space heater with thermostat
• 1x pushbutton and internal light (to help see LBS and grounding switch state through the windows)

25kV 250A PTO

• 1x 25kV 250A load break switch
• 1x grounding bar for the arcing contact of the load break switch
• Interlocked with the load break switch (preventing closing/grounding when the system is live)
• 1x switch operation handle with padlock provision
• 1x kirk key interlock set (interlock between switch handle and door)
• 1x electrical auxiliary contact on the LBS, to open the ground check circuit for the load (open ground check loop of the load when the switch opened)
• 1x 27kV 600A Tavrida breaker
• 1x space heater with thermostat
• 1x pushbutton and internal light (to help see LBS and grounding switch state through the windows)
• 1x emergency stop button (installed on the external door) to open the ground check pilot from feed
• 1x CT for SE-135 Startco
• 1x 25kV output receptacle (Floor access like the PTO7.2kV)
• 4x external status indicator lights

Enclosure specifications:

• Nema 3R
• Exterior doors (with door stopper)
• Fully insulated enclosure
• Canopy on top of this switchgear (to mitigate solar radiation)
• Sand blast surface preparation and epoxy painted
  • UV protection coating

Transformer section

7500KVA power transformer

• Dry type Power Transformer (VPI)
  • MINE DUTY TRANSFORMER
  • 7500kVA
  • NRCan 2019 compliant transformer
  • Class H insulation 220°C
  • 80°C Rise
  • Copper windings
  • Primary: 24940V (Delta) BIL: 150kV
  • Secondary: 7200V (Wye) BIL: 95kV
  • Taps: 4x 2.5%
• Option included
  • Temperature monitoring systems ITM118
  • Primary and secondary Station class surge arrester
  • RC Snubber not required
  • Anti-Condensation Strip Heaters Wired to Thermostat
  • Primary and Secondary CT For the SEL 787 protection relay
• Construction
  • Nema 3R enclosure
  • Air terminal chambers: Primary & Secondary
  • 11 gauge steel construction
  • Finish: ANSI 61 Grey

1x neutral grounding resistor

• 277.3 Ohm, 15A cont. Neutral grounding resistor (NGR)
• ER15kV Startco sensing resistor with CT
• Nema 3R enclosure

Distribution section

7.2kV PTO output including:

• 1x 7.2kV 1200A mainbuss
• 1x 15kV 630A load break switch
• 1x switch operation handle
• 1x kirk key interlock set (interlock between switch handle and door)
• 1x visualization window to see switch state (safety glass)
• 1x 15kV 630A breaker
• 1x 7.2kV output receptacle, Patton and cooke
• 1x controls
• 2x external lights
• Heating and thermostat control
• Enclosure: NEMA 3R