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Fault Location
• Optionally single-ended (conventional) or double-ended fault location via communication interfaces;
• Initiated by trip command or reset of the fault detection
• Fault location output in Ohm, kilometers or miles and % of line length
• Output of the fault location also possible in BCD code
• Parallel line compensation can be selected
• Taking into consideration the load current in case of single-phase earth faults fed from both sides (config-
urable)
• Possibility to take into account line asymmetry and different line sections
Circuit Breaker Failure Protection
• With definite time current stages for monitoring the current flow through every pole of the circuit breaker
• Separate pickup thresholds for phase and earth currents
• Independent timers for single-pole and three-pole tripping;
• Start by trip command of every internal protection function
• Start by external trip functions possible
• Single-stage or two-stage
• Short dropout and overshoot times
• End fault protection and pole discrepancy monitoring possible
Thermal Overload Protection
• Provides thermal replica of the current heat losses of the protected object
• R.m.s. measurement of all three phase currents
• Adjustable thermal and current-dependent warning stages
User-defined Logic Functions (CFC)
• Freely programmable combination of internal and external signals for the implementation of user-defined
logic functions
• All typical logic functions
• Time delays and limit value inquiries
Commissioning, Operation, Maintenance
• Display of magnitude and phase angle of local and remote measured values
• Indication of the calculated differential and restraint currents
• Display of the measured values of the communication link, such as transmission delay and availability
• Function logout of a device from the line protection system possible during maintenance work at an end of
a power line, test mode and commissioning mode
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Introduction
1.3 Characteristics
33
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