Siemens siprotec 7SA522, User Manual

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Introduction
1-6
7SA522 Manual
C53000-G1176-C119-2
1.3 Features
•
Powerful 32-bit microprocessor system.
•
Complete digital processing of measured values and control, from the sampling of
the analog input quantities to the initiation of outputs for, as an example, tripping or
closing circuit breakers or other switch-gear devices.
•
Complete galvanic and reliable separation between the internal processing circuits
of the 7SA522 and the external measurement, control, and DC supply circuits be-
cause of the design of the analog input transducers, binary inputs and outputs, and
the DC converters.
•
Complete scope of functions which are normally required for the protection of a line
feeder.
•
Selectable tripping characteristics: polygonal with separate setting along the X–axis
(reach) and R–axis (arc resistance reserve) and separate R–setting for earth faults,
or MHO–circle–characteristic.
•
Direction determination (with polygon) or polarization (with MHO–circle) is done
with unfaulted loop (quadrature) voltages and voltage memory, thereby achieving
unlimited directional sensitivity.
•
Compensation of the influence of a parallel line during earth faults is possible.
•
Abundance of additional protective and control functions available, some as op-
tions.
•
Continuous calculation and display of measured quantities on the front of the de-
vice.
•
Simple device operation using the integrated operator panel or by means of a con-
nected personal computer running DIGSI
®
4.
•
Storage of operational data, fault data, and oscillographic fault records with SER in-
formation to be used for analysis and troubleshooting.
•
Communication with central control and data storage equipment via serial interfac-
es through the choice of data cable, modem, or optical fibers, as an option.
•
Constant monitoring of the measurement quantities, as well as continuous self-di-
agnostics covering the hardware and software.