ABB REC670 Bay Control Unit 100% Original New

Overview of ABB REC670 Bay Control Unit:

• Functionality: Control, protection, and monitoring of various types of bays in power networks
• Application: Especially suitable for control systems with distributed control IEDs in all bays with high reliability requirements
• Voltage Compatibility: Can be used up to the highest voltage levels
• Suitability: Applicable for controlling all apparatuses in any type of switchgear arrangements

Basic Data:

• Current Transformer Ratio:

  • For 2000/1 A CT: Used for high-current measurements, ratio of 2000 primary amps to 1 secondary amp.
  • For 100/5 A CT: Used for lower-current measurements, ratio of 100 primary amps to 5 secondary amps.

• CT Class:

  • For 2000/1 A CT: Class 5P20, indicating a 20 VA burden and 5% accuracy class.
  • For 100/5 A CT: Class 5P20, indicating a 10 VA burden and 5% accuracy class.

• Secondary Resistance:

  • For 2000/1 A CT: 6.2 ohms
  • For 100/5 A CT: 0.26 ohms

• Cable Loop Resistance:

  • For 2000/1 A CT: Less than 100 m (2.5mm^2), resulting in a resistance of 0.8 ohms at 75°C.
  • For 100/5 A CT: Less than 50 m (2.5mm^2), resulting in a resistance of 0.4 ohms at 75°C.

• Max Fault Current:

  • For both CTs: Limited by switchgear rated fault current, with a maximum of 40 kA.

• Note:

  • Cable loop resistance is kept low to limit the voltage drop and ensure accurate measurements.
  • In case of high earth-fault current, a two-way cable may be necessary.
  • The maximum through fault current is limited by reactor reactance, with inrush typically around 800 A.