Centralized busbar protection relay Siemens Power Transmission Distribution
The SIPROTEC 7SS60 system is an inexpensive numerical differential current protection for busbars in a centralized configuration.
It is suitable for all voltage levels and can be adapted to a large variety of busbar configurations with an unlimited number of feeders. The components are designed for single busbars, 1½-breaker configurations and double busbars with or without couplers.
The use of matching transformers allows phase-selective measurement. Single-phase measurement can be achieved by using summation current transformers.
Features
Optimized for single busbar and 1½ circuit-breaker configurations
Suitable for double busbars with or without couplers
Separate check zone possible
Short trip times
Unlimited number of feeders
Differential current principle
Low-impedance measuring method
Numerical measured-value processing
Suitable for all voltage levels
Low demands on CTs thanks to additional restraint
Measured-value acquisition via summation current transformer or phase-selective matching transformers
Maintained TRIP command (lockout function)
Centralized, compact design
Combinative with separate breaker failure protection
