1.2 Application Scope
23
7SA522 Manual
C53000-G1176-C155-3
Apart from the mentioned fault protection functions, additional protection functions are
possible, such as multi-stage overvoltage, undervoltage and frequency protection,
circuit breaker failure protection and protection against effects of power swings (simul-
taneously active as power swing blocking for the distance protection). For the rapid lo-
cation of the damage to the line after a fault, a fault locator is integrated which also
may compensate the influence of parallel lines.
Digital Transmis-
sion of Protection
Data (optional)
If the distance protection is to be complemented by digital teleprotection schemes, the
data required for this purpose can be transmitted via the protection data interface by
employing a digital communication link. Communication via the protection data inter-
faces can be used for transmitting further information. Besides measured values also
binary commands or other information can be transmitted.
With more than two devices (= ends of the protected object) the communication can
be built up as a ring. This enables a redundant operation in case one communication
line fails. The devices will automatically find the remaining healthy communication
lines. But even with two ends, communication lines can be doubled to create redun-
dancies.
Control Functions Depending on the ordered variant the device provides control functions which can be
accomplished for activating and deactivating switchgears via the integrated operator
panel, the system interface, binary inputs and a personal computer with the operating
software DIGSI
®
. The status of the primary equipment can be transmitted to the device
via auxiliary contacts connected to binary inputs. The current status (or position) of the
primary equipment can be read out at the device, and used for interlocking or plausi-
bility monitoring. The number of the operating equipment to be switched is limited by
the binary inputs and outputs available in the device or the binary inputs and outputs
allocated for the switch position indications. Depending on the equipment used one
(single point indication) or two (double point indication) binary inputs may be used. The
capability of switching primary equipment can be restricted by a setting associated
with the switching authority (remote or local), and by the operating mode (inter-
locked/non-interlocked, with or without password request). Processing of interlocking
conditions for switching (e.g. switching error protection) can be established with the
aid of integrated, user-configurable logic functions.
Messages and Mea-
sured Values; Fault
Recording
The operating messages provide information about conditions in the power system
and the device. Measurement quantities and values that are calculated can be dis-
played locally and communicated via the serial interfaces.
Device messages can be assigned to a number of LEDs on the front cover (allocat-
able), can be externally processed via output contacts (allocable), linked with user-de-
finable logic functions and/or issued via serial interfaces (see Communication below).
During a fault (fault in the system) important events and status changes are stored in
the fault logs. Instantaneous fault values are also saved in the device and may be an-
alyzed subsequently.
C o m m u n i c a t i o n Serial interfaces are available for the communication with operating, control and
memory systems.
A 9-pin DSUB socket on the front cover is used for local communication with a person-
al computer. By means of the SIPROTEC
®
operating software DIGSI
®
4, all operation-
al and evaluation tasks can be executed via this operating
interface, such as specify-
ing and modifying configuration parameters and settings, configuration of user-
specific logic functions, retrieving operational messages and measured values, inquir-
ing device conditions and measured values, issuing control commands.
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