Functions
2.12 Auxiliary Functions
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
117
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. Within a network fault, several indications can occur (from the first pickup of a protective function
to the last dropout of a protective function). Each fault record represents a network fault.
In total 600 indications can be recorded. Oldest data are erased for newest data when the buffer is full.
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.
2.12.1.3 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.
2.12.2 Statistics
The number of trips initiated by the 7RW80 and the operating hours under load are counted. An additional
counter enables the tripping of the count of the hours, in which the circuit breaker is positioned in condition
„close“.
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.
2.12.2.1 Description
Number of Trips
In order to count the number of trips of 7RW80, the 7RW80 relay has to be informed of the position of the circuit
breaker auxiliary contacts via binary inputs. Hereby, it is necessary that the internal pulse counter 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 "Measured and Metered Values Only"
was enabled in the configuration matrix.
Operating Hours
Moreover, the operating hours are summed (device operating time).
Hours Meter "CB open"
A counter can be implemented as CFC application which, similarly to the operating hours counter, counts the
hours in the condition „circuit breaker open“. The universal hours counter is connected to a corresponding
binary input and starts counting if the respective binary input is active. The counter can be set or reset. A CFC
application example for such a counter is available on the Internet (SIPROTEC Download Area).
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