Information To A Substation Control Center - Siemens siprotec SJ62 User Manual

2 Functions
Spontaneous Dis-
plays on the Device
Front
Retrieved Messag-
es
Ground Faults
(Sensitive Ground
Fault Log)
General Interroga-
tion
Spontaneous Mes-
sages

2.23.2.3 Information to a Substation Control Center

319
For devices featuring a four-line text display the most relevant fault data appears
without further operating actions, automatically after a general pickup of the device, in
the sequence shown in Figure 2-115.
If the device features a graphical display, these messages will only occur if they were
set at address 611 unlike the default setting to allow for spontaneous fault messages.
Figure 2-115 Display of spontaneous messages in the display – example
The messages for the last eight network faults can be retrieved and read out. The def-
inition 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 re-
closing shots, occupies 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 represents a network
fault.
In total 600 indications can be recorded. Oldest data are erased for newest data when
the buffer is full.
For ground faults, there are available special ground fault logs for devices with sensi-
tive ground fault detection. Messages are provided if the sensitive ground fault detec-
tion function is not set to Alarm Only (address 3101 = Alarm Only). The pickup of
the 64 element (VN>) starts the ground fault log. The drop out of this pickup finishes
the ground fault log. The ground fault log starts by issuing the annunciation 303 „sens
Gnd flt" (ON), the function closes by issuing the annunciation OFF.
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.
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 interroga-
tion are displayed with their present value.
The spontaneous messages displayed using DIGSI reflect the present status of in-
coming information. Each new incoming message appears immediately, i.e. the user
does not have to wait for an update or initiate one.
If the device has a serial system interface, stored information may additionally be
transferred via this interface to a centralized control and storage device. Transmission
is possible via different transmission protocols.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015