1.3 Characteristics
25
7SA522 Manual
C53000-G1176-C155-3
1.3 Characteristics
General Features • Powerful 32-bit microprocessor system
• Complete digital processing of measured values and control, from the sampling of
the analog input values up to the closing and tripping commands to the circuit
breakers
• Complete galvanic and reliable separation between internal processing circuits
from the measurement, control, and power supply circuits by analog input transduc-
ers, binary inputs and outputs and the DC/DC or AC/DC converters
• Complete scope of functions which are normally required for the protection of a line
feeder
• Digital protection data transmission, may be used for teleprotection with permanent
monitoring of disturbance, fault or transfer time deviations in the communication
network with automatic runtime re-adjustment
• Distance protection system realizable for 3 ends
• Simple device operation using the integrated operator panel or a connected person-
al computer with operator guidance
• Storage of fault indications as well as instantaneous values for fault recording
Distance Protection • Protection for all types of faults in systems with earthed, compensated or isolated
starpoint
• Selectable polygonal tripping characteristic or MHO-circle characteristic;
• Reliable differentiation between load and fault conditions also on long, high-loaded
lines
• High sensitivity in the case of a weakly loaded system, extreme stability against
load jumps and power swings
• Optimum adaption to the line parameters by means of the tripping characteristic
with diverse configuration parameters and “load trapezoid” (elimination of the pos-
sible load impedances);
• Six measuring systems for each distance zone
• Six distance zones, selectable as forward, reverse or non-directional reaching, one
may be used as an overreach zone
• Nine time stages for the distance zones
• Direction determination (with polygon) or polarisation (with MHO-circle) is done with
unfaulted loop (quadrature) voltages and voltage memory, thereby achieving unlim-
ited directional sensitivity, and not affected by capacitive voltage transformer tran-
sients
• Suitable for lines with series compensation
• Insensitive to current transformer saturation
• Compensation against the influence of a parallel line
• Shortest tripping time is approx. 17 ms (for f
N
= 50 Hz) or 15 ms (for f
N
= 60 Hz)
• Phase segregated tripping (in conjunction with single-pole or single- and three-pole
auto-reclosure)
• Non-delayed tripping following switch onto fault
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