SPAD346C ABB
The voltage stabilizing differential relay SPAD 346 C is designed specifically for protecting dual winding power transformers and generator transformers. The main features include protection against winding short circuits, inter turn faults, ground faults and short circuits, as well as inter winding and pole short circuits. In addition, relays can be used for the protection of three winding power transformers, provided that 75% of the short-circuit power of the power transformer comes from the same direction.
Product Features
Integrated three-phase differential relay, three-phase overcurrent relay, and multi configuration ground fault relay
Three level overcurrent module and two level backup ground fault protection for power transformers and generators
Stable protection against accidental operation outside the protection area and in the event of transformer surge faults
Second harmonic suppression for preventing unnecessary relay operation during transformer inrush current
Fifth harmonic suppression for preventing unnecessary relay operation during transformer overexcitation
Wide CT ratio correction range – precise correction through digital settings
Four overload output relays for circuit breaker tripping and five relays for signal output
Five programmable external control inputs
Integrated circuit breaker failure protection with adjustable action time
Differential relay and ground fault relay module with integrated fault recorder function for analog and digital signals
Sensitive phase current and phase angle display helps to check excitation circuit connections and vector group matching
High immunity to electrical and electromagnetic interference allows relays to be used in harsh environments
Continuously monitoring hardware and software to achieve high availability and system reliability
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