2 Functions
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7SA522 Manual
C53000-G1176-C155-3
auto-reclose cycles are also stored cohesively. Accordingly a system fault may contain
several individual fault events (from fault detection up to reset of fault detection).
Information to a
C o nt r o l C en t r e
If the device has a serial system interface, stored information may additionally be
transferred via this interface to a centralised control and storage device. Transmission
is possible via different transmission protocols.
You may test whether the information is transmitted correctly with DIGSI
®
.
Also, the information transmitted to the control centre can be influenced during oper-
ation or tests. The IEC 60870-5-103 protocol allows to identify all messages and mea-
sured values transferred to the central control system with an added message “ test
operation”- bit while the device is being tested on site (test mode). This identification
prevents the messages from being incorrectly interpreted as resulting from an actual
power system disturbance or event. Alternatively, you may disable the transmission of
annunciations to the system interface during tests (“transmission block”).
To influence information at the system interface during test mode (“test mode” and
“transmission block”), a CFC logic is required. Default settings already include this
logic (see Appendix).
The SIPROTEC
®
4 System Description describes in detail how to activate and deac-
tivate test mode and blocked data transmission.
Classification of
Messages
Annunciations can be of one of the following types:
• Operational messages
: messages generated while the device is in operating: They
include information about the status of device functions, measurement data, system
data, and similar information.
• Fault Annunciations
: messages from the last 8 network faults that were processed
by the device.
• Messages of the Statistic
: they include a counter for the switching actions of the
circuit breakers initiated by the device, maybe reclose commands as well as values
of interrupted currents and accumulated fault currents.
A complete list of all message and output functions that can be generated by the
device with the maximum functional scope can be found in the Appendix. All functions
are associated with a information number (FNo). It also indicates where each
message can be sent to. If functions are not present in the specific version of the
device, or if they are set to 'LVDEOHG, then the associated messages cannot appear.
Operational Mes-
sages (Buffer:
Event Log)
The operational messages contain information that the device generates during oper-
ation and about operational conditions.
Up to 200 operational messages are recorded in chronological order in the device.
Newly generated annunciations are added to those already there. If the maximum ca-
pacity of the memory is exhausted, the oldest respective indication is lost.
Operational annunciations arrive automatically and can be read out from the device
display or a personal computer at any time. Faults in the power system are indicated
with “Network Fault” and the present fault number. The fault messages contain de-
tailed information on the behaviour of the power system fault.
Fault Annuncia-
tions
Following a system fault, it is possible to for example retrieve important information re-
garding its progress, such as pickup and trip. The time the initial occurrence of the
short-circuit fault occurred is accurately provided via the system clock. The progress
of the disturbance is output with a relative time referred to the instant of fault detection,
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