Not active product since 2009
The differential relay SPAD 330 C is designed to be used as a fast interwinding short-circuit and interturn fault protection for two-winding power transformers and power plant generator-transformer units. The relay is also adopted for three-winding power transformers provided that the power transformer is characterized by a unidirectional flow.
Scope
- Three-phase biased differential relay for the protection of power transformers and generator-transformer units
Product benefits
- Multi-functional protection functions
Product features
- Three-phase biased differential relay for the protection of power transformers and generator-transformer units.
- Matching of the power transformer vector group with DlL switches and the electronics. No intermediate current transformers are needed.
- The transforming ratio errors of the C.T.s separately correctable on the HV and LV side of the power transformer.
- Separately adjustable differential current high-set instantaneous stage.
- Stabilized operating principle prevents spurious function on faults occurring outside the area of protection.
- Blocking function, for prevention of spurious operations caused by connection inrush currents, based on the occurrence of the second harmonic.
- Local display of measured and set values on relay front panel.
- Continuous self-supervision of the electronic circuitry and the operation of the microprocessor.