Product Catalog

MinePwr-MV-R30125-000

Description

25kV MV distribution substation

Section 1:

1x 25kV input compartment:

  • Compartment 1 – 25kV switch
    • 3x LED voltage indicators (connected to input terminals)
    • 3x surge protector (Distribution Class – Heavy duty) (connected to the switch input)
    • Load switch 25kV 600A (without fuse)
    • 1x AC control transformer 25000V/120V protections
      • Primary and secondary fuses
    • Recessed handles to prevent breakage during transport.
    • Kirk-key interlock between the 25kV switch door, the circuit breaker door and the switch handle to prevent opening under voltage
    • Window (safety glass) for displaying the status of the switch contacts
    • Cable entry from the top or bottom/side via connection box
  • Compartment 2 – 25kV circuit breaker
    • Fixed vacuum circuit breaker 25kV 16kA 600A electrically operated
    • Opening device in the event of undervoltage (opening of the circuit breaker if the control voltage is lost)
    • Overcurrent protection made by the protection relay (installed in the control compartment)
    • Kirk-key interlock between the 25kV switch door, the circuit breaker door and the switch handle to prevent opening under voltage
    • Window (safety glass) for viewing the circuit breaker

Section 2:

  • Transformer 24940V / 4160/2400V “Delta-Wye” including:
    • Power: 2500kVA
    • 150 C Rise
    • Adjustment rate: 4x 2.5% (2FCAN+2FCBN)
    • 3x surge protector (Distribution Class – Heavy duty)
    • 1x temperature monitor with opening/alarm contacts (control section)
      • § Programmable microprocessor controller
      • RS-485 (Modbus ASCII/RTU) Communication
      • § Alarm #1 – 100°C – Alarm temperature (dry contact)
      • § Alarm #2 – 170°C – Alarm temperature (dry contact)
      • § Alarm #3 - 200°C – High temperature alarm (dry contact)
      • § Type “J” thermocouple installed in the transformer
      • § 12x cooling fans (automatic mode)
  • Compartment including:
    • 1x Measuring transformer 4160V/120V (open delta)
      • Primary and secondary fuses
  • NGR section including:
    • Neutral resistance 2.4kV (NGR) 96 Ohm, 25A.
    • Supervisory resistor with CT
  • 1x 5kV transfer switch (power supply from transformer or external generator):
    • Switch without fuse 5kV 600A
    • Kirk-key interlock between door and switch to prevent opening under power;
    • Interlock Kirk-key between the 2 source positions
    • Interlock Kirk-key between the 2 compartment access
    • Recessed handles to prevent breakage during transport.
    • Window (safety glass) for displaying the status of the switch contacts

Section 3:

  • 2x 5kV secondary feeder (with earth fault detection and ground continuity – ground fault/ground check):
    • 5kV 600A switch with “backup” type fuses (3x 200A)
    • 1x vacuum contactor 5kV
    • Earth fault/mass continuity detector (installed in control compartment) with CT
      • Ground continuity supervision resistor (to be installed in the tunnel boring machine by you)
    • Recessed handles to prevent breakage during transport.
    • Window (safety glass) for displaying the status of the switch contacts
  • Control section including:
    • 1x Active arc flash system
      • Arc flash protection relay with high speed opening contact
      • 3x CT at 25kV input
      • Optical sensors in all compartments including the secondary artery
      • Opening of the 25kV main disconnector in the event of breakdown of the neutral resistance or earth leakage
  • Enclosure including:
  • Drip-proof housing
  • Cabinet cleaned with sandblasting and gray epoxy paint;
  • Approximate dimensions:
  • 104’’ H x 90’’ D x 270’’ W
  • Approximate weight: 40,000 pounds

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