Protection Functions

• Busbar Differential system for protection of up to 4 buses and 28 lines. Applicable to any substation scheme
  
  
• Distributed architecture
  
  
• CT saturation detectors provide a high level of stability
• External fault detector prevents trips for faults outside the protected zone
• Dedicated elements to determine fault duration

• Supervisory differential unit - The main differential element is supervised by a more sensitive differential element that monitors the entire bus
  
  
• Differential alarm unit - These alarm elements detect differential currents not large enough to trip the relay, but that may be an indication of problems in the bus
  
  
• Lockout unit - Prevents the closing of breakers after a DBN trip
  
  
• Supervisory Overcurrent unit - All trip commands are monitored at each Bay Terminal by overcurrent elements. Trips are blocked in those bays with a negligible current flow
  
  
• Supervisory Undervoltage unit (optional) - A bus Voltage IED can be installed to provide additional means of fault location detection. Trips are blocked for voltage values below the setting value
  
  
• Breaker failure - This unit resides in the DBP units providing indication of breaker failure for both single-pole and three-pole trips
  
  
• Oscillography
  

• Phase correction via virtual interposing CT software. Allows the use of the existing transformers in retrofit applications
• Transparent communication system allows the entire substation to be controlled from any IED
• 3 settings groups per unit
• Sequence of events log - 100 event capacity with 1 ms resolution
• Time synchronization system wide. Permits accurate analysis of sequence of events logs
• Hardware, firmware and communications self test
• Phase current, differential current, restraint current
• Bus voltage metering (optional)
  
  DBC Features
• 7 digital status contact inputs (expandable to 14)
• 7 auxiliary outputs (expandable to 14)
• 13 programmable LED targets
• 2 double trip contacts
• Optional I/O modules
  
  DBP Features
• 8 digital status contact inputs (expandable to 16)
• 8 auxiliary outputs (expandable to 16)
• 5 programmable LED targets
• 1 double trip contact and 1 double blocking contact
• Optional I/O modules
  

• Protocol DNP 3.0 Level