Information On The Integrated Display (Lcd) Or Personal Computer - Siemens SIPROTEC 7SJ61 Manual

Functions
2.17 Auxiliary Functions

2.17.1.2 Information on the Integrated Display (LCD) or Personal Computer

Events and conditions can be read out on the display at the front cover of the relay. Using the front PC interface
or the rear service interface, a personal computer can be connected, to which the information can be sent.
The relay is equipped with several event buffers, for operational messages, circuit breaker statistics, etc., which
are protected against loss of the auxiliary voltage by a buffer battery. These messages can be displayed on the
LCD at any time by selection via the keypad or transferred to a personal computer via the serial service or PC
interface. Readout of messages during operation is described in detail in the SIPROTEC 4 System Description.
Classification of Messages
The messages are categorized as follows:
• Operational messages (event log); messages generated while the device is operating: Information regarding
the status of device functions, measured data, power system data, control command logs etc.
• Fault messages (trip log): messages from the last 8 network faults that were processed by the device.
• Ground fault messages (when the device has sensitive ground fault detection).
• Messages of "statistics"; they include a counter for the trip commands 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 an information number (FNo).
There is also an indication of where each message can be sent to. If functions are not present in a not fully
equipped version of the device, or are configured to Disabled, then the associated indications cannot appear.
Operational Messages (Buffer: Event Log)
The operational messages contain information that the device generates during operation and about operation-
al conditions. Up to 200 operational messages are recorded in chronological order in the device. New messag-
es are appended at the end of the list. If the memory is used up, then the oldest message is scrolled out of the
list by a new message.
Fault Messages (Buffer: Trip Log)
After a fault on the system, for example, important information about the progression of the fault can be re-
trieved, such as the pickup of a protective element or the initiation of a trip signal. The start of the fault is time
stamped with the absolute time of the internal system clock. The progress of the disturbance is output with a
relative time referred to the instant of fault detection, so that the duration of the fault until tripping and up to reset
of the trip command can be ascertained. The resolution of the time information is 1 ms
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SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008