Not active product since 2009
The voltage relay SPAU 331 C is intended for supervision of busbar voltages in distribution network substations. The relay measures the phase-to-phase voltage and the residual voltage and provides three-phase undervoltage protection and residual overvoltage protection.
The relay can also be used in other applications requiring undervoltage protection and residual voltage supervision, e.g. for the protection of large motors.
Scope
- Phase-to-phase voltage and the residual voltage measurements with three-phase undervoltage protection and residual overvoltage protection
Product benefits
- Supervision of the substation busbar as well as protecting motor assets
Product features
- Two-stage residual overvoltage relay module containing a low-set residual overvoltage stage U0> and a high-set residual overvoltage stage U0>>
- Both residual overvoltage stages feature definite time characteristic and wide setting ranges
- Two-stage undervoltage relay module containing a higher undervoltage stage U< and a lower undervoltage stage 3U<<
- The three-phase undervoltage stage U< starts if one or more of the phase-to-phase voltages fall below the set start level
- The three-phase undervoltage stage 3U<< starts if all three phase-to-phase voltages fall below the set start level
- The undervoltage stage U< can be given definite time characteristic or inverse time characteristic while the undervoltage stage 3U<< has a definite time characteristic only
- High system reliability and availability through integrated self-supervision system with auto-diagnostic capabilities in the relay modules