SIPROTEC 7SS60 - Centralized Numerical Busbar Protection
Description
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. Different primary CT ratios can be matched by using appropriate windings of the input current transformers. The use of matching transformers allows phase-selective measurement. Single-phase measurement can be achieved by using summation current transformers.
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Function overview
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
• Matching of different primary CT ratios
• 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 Monitoring functions
• Primary current transformers including supply leads
• Operational measured values: Differential and restraint current
• Self-supervision of the relay
• 30 event logs
• 8 fault logs
• 8 oscillographic fault records Communication interface
• RS485 interface for local and remote operation with DIGSI Hardware
• Concept of modular components
• Reduced number of module types
• Auxiliary voltage 48 V DC to 250 V DC
• 7SS601 measuring system in 1/6 19-inch housing 7XP20
• Peripheral components in ½ 19-inch housing 7XP20
Front design
• Display for operation and measured values
• 6 LEDs for local indication
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. Different primary CT ratios can be matched by using appropriate windings of the input current transformers. The use of matching transformers allows phase-selective measurement. Single-phase measurement can be achieved by using summation current transformers.
_____________________
Function overview
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
• Matching of different primary CT ratios
• 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 Monitoring functions
• Primary current transformers including supply leads
• Operational measured values: Differential and restraint current
• Self-supervision of the relay
• 30 event logs
• 8 fault logs
• 8 oscillographic fault records Communication interface
• RS485 interface for local and remote operation with DIGSI Hardware
• Concept of modular components
• Reduced number of module types
• Auxiliary voltage 48 V DC to 250 V DC
• 7SS601 measuring system in 1/6 19-inch housing 7XP20
• Peripheral components in ½ 19-inch housing 7XP20
Front design
• Display for operation and measured values
• 6 LEDs for local indication