Siemens SIPROTEC 4 7SD80

Characteristics
General Properties
•
Powerful 32-bit microprocessor system
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Complete digital processing of measured values and control, from the sampling of the analog input
values, the processing and organization of the communication between devices up to the closing and
tripping commands to the circuit breakers.
•
Total galvanic and fail-safe separation of the internal processing circuits from the measuring, control and
supply circuits of the system via measuring transformers, binary input and output modules and DC or AC
converters
•
Suited for lines with two ends
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Easy device operation using the integrated operator panel or from a connected personal computer
running DIGSI
•
Storage of fault indications as well as instantaneous values for fault recording
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Digital protection data transmission; communication of the device through optical fiber cables
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Communication is possible via a single copper wire pair (typically 8 km (4.97 miles), max. 20 km (12.43
miles), depending on the used cable type, see Section 4 Technical Data).
•
Permanent supervision of the protection data transmission for disturbance, failure or transfer time varia-
tions
Phase Comparison Protection
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Differential protection for two ends with digital protection data transmission
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Protection for all types of short-circuits in systems with any starpoint conditioning
•
Reliable distinction between load and short-circuit conditions using adaptive measurement methods, also
for high-resistance faults with small fault currents
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High sensitivity in light load operation, highest stability against load steps and power fluctuations
•
Due to phase segregated measurement, the pickup sensitivity is independent of the fault type
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Detection of high-resistance, weak-current faults due to high sensitivity of the protection functions
•
Fast tripping also on weak or zero infeed ends (breaker intertrip)
•
No frequency dependency
Ground Fault Differential Protection for Grounded Systems
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Short command time
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High sensitivity for short circuits to ground
•
High stability against external ground faults by stabilizing the through-flowing ground current
Ground Fault Differential Protection for Isolated / Grounded Systems
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Short command time
•
High sensitivity for short circuits to ground
•
High stability against external short-circuits to ground using the magnitude and phase relationship of the
ground current flowing through for stabilization
External Direct and Remote Tripping
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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
1.3
Introduction
1.3 Characteristics
SIPROTEC 4, 7SD80, Manual 25
E50417-G1100-C474-A2, Edition 02.2018