Introduction
1.3 Characteristics
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
24
External Direct and Remote Tripping
• Tripping of the local end by an external device via binary input
• Tripping of the opposite end by local protection functions or by an external device via binary input
Time Overcurrent Protection
• Optionally selectable as emergency function during protection data communication failure or as backup
function or both
• A maximum of 3 definite time elements and one inverse time element, each for phase currents and ground
current
• A maximum of 2 directional definite time elements and one directional inverse time element, each for phase
currents and ground current
• For inverse time overcurrent protection, selection from various characteristics of different standards possible
• Blocking options e.g. for reverse interlocking with any element
• Instantaneous tripping when closing onto a short circuit possible with any element
Inrush Current Restraint
• Insensitive to inrush currents, even in the case of feeder transformers in the protected zone, and against
higher-frequency transients
• High stability also for different current transformer saturation
Circuit-Breaker Failure Protection
• With independent current elements for the monitoring of the current flow through each pole of the circuit
breaker
• Separate pickup thresholds for phase and ground currents
• Monitoring time element for tripping
• Initiation by the trip command of each integrated protection function
• Initiation by external trip functions possible
• Single-element or two-element
• No dropout and seal-in times
Thermal Overload Protection
• Thermal replica of the current heat losses of the protected object
• RMS measurement for all three phase currents
• Adjustable thermal and current-dependent warning elements
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