Ground Fault Messages
In devices with sensitive ground fault detection, separate ground fault logs are provided for ground fault
recording. 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 responded
and the angle condition is fulfilled. (Detailed information is provided in the logic diagrams for ground fault
detection, Section
2.13 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
). 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.
Information to a Substation Control Center
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.
Statistics
The number of trips initiated by the 7SJ62/64, the number of close commands initiated by the AR and the
operating hours under load are counted.
An additional counter allows the number of hours to be determined in which the circuit breaker is positioned
in the “open” condition. Further statistical data can be gained to optimize the intervals for circuit breaker main-
tenance.
Furthermore, if the device is utilized as motor protection, statistical values regarding the operation of the
motor as well as the last 5 motor startups are available.
The counter and memory levels are secured against loss of auxiliary voltage.
During the first start of the protection device the statistical values are pre-defined to zero.
Description
Number of Trips
of Trips In order to count the number of trips of 7SJ62/64, the 7SJ62/64 relay has to be informed of the posi-
tion of the circuit breaker auxiliary contacts via binary inputs. Hereby, it is necessary that the internal pulse
counter
#of TRIPs=
is allocated in the matrix to a binary input that is controlled by the circuit breaker OPEN
position. The pulse count value "Number of TRIPs CB" can be found in the "Statistics" group if the option "Meas-
ured and Metered Values Only" was enabled in the configuration matrix.
Number of Automatic Reclosing Commands
The number of reclosing commands initiated by the automatic reclosing function is summed up in separate
counters for the 1st and ≥ 2nd cycle.
2.25.1.3
2.25.2
2.25.2.1
Functions
2.25 Auxiliary Functions
SIPROTEC 4, 7SJ62/64, Manual
319
C53000-G1140-C207-8, Edition 08.2016
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