Overview

The RET615 is a dedicated transformer protection and control IED (Intelligent Electronic Device) designed for power transformers, including unit and step-up transformers, as well as power generator-transformer blocks in utility and industrial power distribution systems. It is part of ABB's Relion® product family and the 615 protection and control series. The 615 series IEDs are characterized by their compactness and withdrawable design.

Specifications

Dimensions

• Width:
  • Frame: 177 mm
  • Case: 164 mm
• Height:
  • Frame: 177 mm (4U)
  • Case: 160 mm
• Depth:
  • 201 mm (153 mm + 48 mm)
• Weight:
  • Complete protection relay: 4.1 kg
  • Plug-in unit only: 2.1 kg

Power Supply

• Nominal Auxiliary Voltage (Un):
  • AC: 100, 110, 120, 220, 240 V, 50 and 60 Hz
  • DC: 24, 30, 48, 60 V, 110, 125, 220, 250 V
• Maximum Interruption Time in the Auxiliary DC Voltage:
  • 50 ms at Un, without resetting the relay
• Auxiliary Voltage Variation:
  • AC: 38...110% of Un (38...264 V AC)
  • DC: 50...120% of Un (12...72 V DC), 80...120% of Un (38.4...300 V DC)
• Start-up Threshold: 19.2 V DC (24 V DC × 80%)
• Burden of Auxiliary Voltage Supply:
  • DC (nominal): <13.0 W / (max.): <18.0 W
  • AC (nominal): <16.0 W / (max.): <21.0 W
• Ripple in the DC Auxiliary Voltage: Max 15% of the DC value (at frequency of 100 Hz)
• Fuse Type: T4A/250 V

Energizing Inputs

• Rated Frequency: 50/60 Hz ± 5 Hz

• Current Inputs:

  • Rated Current (In): 1/5 A
  • Thermal Withstand Capability:
    • Continuously: 20 A
    • For 1 s: 500 A
  • Dynamic Current Withstand (Half-wave Value): 1250 A
  • Input Impedance: <20 mΩ

• Voltage Inputs:

  • Rated Voltage: 60...210 V AC
  • Voltage Withstand:
    • Continuously: 240 V AC
    • For 10 s: 360 V AC
  • Burden at Rated Voltage: <0.05 VA