Not active product since 2009
The combined phase overcurrent and earth-fault relay SPAJ 135 C is intended to be used for time and current graded overcurrent and earth-fault protection in distribution networks. The relay is especially suited for use in solidly earthed and low-resistance earthed networks.
The relay provides a two-phase non-directional overcurrent protection and non-directional earth-fault protection. The two-stage overcurrent unit includes a low-set stage I> and a high-set stage I>>. The low-set stage I> features field-selectable definite time characteristic or inverse definite minimum time (IDMT) characteristic as per IEC 255. The high-set stage I>> operates either instantaneously or has a definite time characteristic. The earth-fault unit I 0 > also features field-selectable definite time characteristic or inverse definite minimum time (IDMT) characteristic as per IEC 255.
Scope
- Combined phase overcurrent and earth-fault protection
Product benefits
- Protection for a variety of power distribution applications
Product features
- Two-stage phase overcurrent protection and single-stage earth-fault protection in one relay
- Two-phase low-set definite time or inverse time (IDMT) overcurrent stage
- Two-phase high-set instantaneous or definite time overcurrent stage
- Non-directional definite time or inverse time (IDMT) earth-fault stage
- Fully field-configurable output relay functions
- Serial interface for bus connection module and fiber-optic substation bus
- Continuous self-supervision of relay hardware and software for enhanced system reliability and availability