SPAD346C3 ABB Differential relay

Product features

• Integrated three-phase differential relay, three-phase overcurrent relay and multi-configurable earth-fault relay
• Three-stage overcurrent module providing protection for power transformers and generators and two-stage backup earth-fault protection
• Stabilized against unwanted operations at faults occurring outside the protected area and at transformer inrush
• Second harmonic restraint for prevention of unwanted relay operations at transformer inrush
• Fifth harmonic restraint for prevention of unwanted relay operations at transformer overexcitation
• Wide CT ratio correction range – accurate correction through digital setting
• Four heavy-duty output relays for circuit breaker tripping and five output relays for signalling
• Five programmable external control inputs
• Integrated circuit breaker failure protection with adjustable operate time
• Differential relay and earth-fault relay modules with integrated disturbance recorder functions for analog and digital signals
• Sensitive phase current and phase angle displays facilitate checking of energizing circuit connections and vector group matchings
• High immunity to electrical and electromagnetic interference allows the relay to be used in severe environments
• High availability and system reliability due to continuous supervision of hardware and software