Introduction
1.3 Characteristics
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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1.3 Characteristics
General Features
• Powerful 32-bit microprocessor system
• Complete digital processing of measured values and control, from the digitzing of the analog input values,
the processing and organization of the communication between devices up to the closing and tripping com-
mands to the circuit breakers
• Complete galvanic separation and interference immunity of the internal processing circuits from the mea-
surement, control, and power supply circuits by analog input transducers, binary inputs and outputs and the
DC/DC or AC/DC converters
• Suited for lines with up to 6 ends, even with transformers in the protected zone (order option)
• Simple device operation using the integrated operator panel or a connected personal computer with operator
guidance
• Storage of fault indications and instantaneous values for fault recording
Differential protection
• Differential protection for up to 6 ends with digital protection data transmission
• Protection for all types of short-circuits in systems with any neutral-point treatment conditioning
• Reliable differentiation between load and fault conditions also in high-resistant, current-weak faults by adap-
tive measuring procedures
• High sensitivity in case of weakly loaded system, extreme stability against load jumps and power swings
• Phase-selective measurement ensures that the pickup sensitivity is independent of the fault type
• Suited for transformers in the protected zone (order variant)
• Detection of high-resistance, weak-current faults due to high sensitivity of the protection functions
• Insensitive to inrush and charging currents – also for transformers in the protected zone – and to higher-
frequency transient processes
• Charging current compensation; therefore increased pickup sensitivity
• High stability also for different current transformer saturation
• Adaptive stabilisation that is automatically derived from the measured quantities and the configured current
transformer data
• Fast, phase segregated tripping also on weak or zero infeed ends (breaker intertrip)
• Low dependence on frequency
• Digital protection data transmission; communication between devices via dedicated communication links (in
general optical fibre) or a communication system
• Communication possible via a single copper wire pair (typically 8 km, max. up to 30 km, depending on cable
type used)
• Synchronization via GPS possible, resulting in automatic correction of transmission time differences thus
increasing once more the sensitivity
• Permanent monitoring of the protection data transmission concerning disturbance, failure or transfer time
deviations in the transmission network with automatic transfer time correction
• Automatic changeover of the communication paths possible in case of transmission failure or transmission
disturbance
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