Not active product since 2009
The feeder protection relay SPAS 348 C is used in applications, which require directional phase overcurrent, directional short-circuit and directional earth-fault protection. Typically, the relay is used for the overcurrent and earth-fault protection of infeeders and busbars in distribution substations provided with multiple infeeders supplied via power transformers from the same high-voltage busbar system.
The relays are also applied for the selective short-circuit and earth-fault protection of parallel multiple feeders between substations and for feeder protection in ring-type and meshed distribution networks. Further, directional relays are used for the protection of radial feeders supplied with a small back-feed of energy from a generator in the consumer-end of the feeder.
Scope
- Directional phase overcurrent, directional short-circuit and directional earth-fault protection
Product benefits
- Protecting transformer and generator assets
Product features
- Three-phase overcurrent protection with two directional stages and one non-directional high-set stage
- Two-stage directional earth-fault protection or alternatively three-stage residual voltage protection
- Eight freely configurable output relays and output relay for internal relay fault
- Special memory circuit for maintaining the stability and reliability of the direction measurement at close three-phase faults
- Four heavy-duty relays for CB control and five relays for signalling purposes
- Continuous self-supervision of relay hardware and software for enhanced system reliability and availability