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Functions
2.20 Auxiliary Functions
Retrievable Messages
The messages for the last eight network faults can be retrieved and read out. The definition of a network fault
is such that the time period from fault detection up to final clearing of the disturbance is considered to be one
network fault. If auto-reclosing occurs, then the network fault ends after the last reclosing shot, which means
after a successful reclosing or lockout. Therefore the entire clearing process, including all reclosing shots, oc-
cupies only one trip log buffer. Within a network fault, several fault messages can occur (from the first pickup
of a protective function to the last dropout of a protective function). Without auto-reclosing each fault event rep-
resents a network fault.
In total 600 indications can be recorded. Oldest data are erased for newest data when the buffer is full.
Ground Fault Messages
In devices with sensitive ground fault detection, separate ground fault logs are provided for ground fault record-
ing. These logs are completed if the ground fault detection is not set to tripping but to Alarm Only (address
3101 = Alarm Only) or the setting ON with GF log has been selected. With setting ON with GF log,
there is also a trip, apart from the opening of the ground fault log.
For cos-ϕ / sin-ϕ measurements, a criterion for the opening of the ground fault log is the pickup of the VN>-
Element. For „U0/I0-ϕ measurements" the ground fault log is opened as soon as a VN>-Element has respond-
ed and the angle condition is fulfilled. (Detailed information is provided in the logic diagrams for ground fault
detection, Section 2.11). As soon as the pickup drops out, the fault recording is terminated. The ground fault
log is opened as soon as the message 1271 „Sens.Gnd Pickup" (appearing) is issued and terminated upon
disappearing of such message.
Up to 45 ground fault messages can be recorded for the last 3 ground faults. If more ground fault messages
are generated, the oldest are deleted consecutively.
General Interrogation
The general interrogation which can be retrieved via DIGSI enables the current status of the SIPROTEC 4
device to be read out. All messages requiring general interrogation are displayed with their present value.
Spontaneous Messages
The spontaneous messages displayed using DIGSI reflect the present status of incoming information. Each
new incoming message appears immediately, i.e. the user does not have to wait for an update or initiate one.
2.20.1.3 Information to a Control Center
Stored information can additionally be transferred to a central control and storage device if the relay is connect-
ed to such a device via port B. Transmission is possible via various transmission protocols.
262
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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