Siemens SIPROTEC 4 7UT6 Series, Руководство пользователя

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Auxiliary Functions
The additional functions of the 7UT6x differential protection relay include:
•
processing of messages,
•
processing of operational measured values,
•
storage of fault record data.
Processing of Messages
General
For a detailed fault analysis, information regarding the reaction of the protection device and the measured
values following a system fault are of interest. For this purpose, the device provides information processing
which operates in a threefold manner:
Indicators and Binary Outputs (Output Relays)
Important events and states are displayed by LEDs on the front cover. The device also contains output relays
for remote signaling. Most indications and displays can be configured differently from the delivery default
settings (for information on the delivery default setting see Appendix). The SIPROTEC 4 System Description
gives a detailed description of the configuration procedure.
The output relays and the LEDs may be operated in a latched or unlatched mode (each may be individually
set).
The latched conditions are protected against loss of the auxiliary voltage. They are reset
•
On site by pressing the LED key on the relay,
•
Remotely using a binary input configured for that purpose,
•
via one of the serial interfaces,
•
Automatically at the beginning of a new pickup.
Status messages should not be latched. Also, they cannot be reset until the criterion to be reported is
remedied. This applies to, e.g., indications from monitoring functions, or the like.
A green LED displays operational readiness of the relay (“RUN”); it cannot be reset. It extinguishes if the self-
check feature of the microprocessor detects an abnormal occurrence, or if the auxiliary voltage fails.
When auxiliary voltage is present but the relay has an internal malfunction, the red LED (“ERROR”) lights up
and the processor blocks the relay.
DIGSI enables you to selectively control each output relay and LED of the device and, in doing so, check the
correct connection to the system. In a dialog box, you can, for instance, cause each output relay to pick up,
and thus test the wiring between the 7UT6x and the system without having to create the indications masked
to it.
Information on the Integrated Display (LCD) or to a Personal Computer
Events and conditions can be read out on the display on the front panel of the relay. Using the front operator
interface or the rear service interface, for instance, a personal computer can be connected, to which the infor-
mation can be sent.
In the quiescent state, i.e. as long as no system fault is present, the LCD can display selectable operational
information (overview of the operational measured values) (default display). In the event of a system fault,
information regarding the fault, the so-called spontaneous displays, are displayed instead. After the fault indi-
cations have been acknowledged, the quiescent data are shown again. Acknowledgement is accomplished by
pressing the LED buttons on the front panel (see above).
The device in addition has several event buffers for operational annunciations, switching statistics, etc., which
are saved against loss of auxiliary supply by means of a backup battery. These messages can be displayed on
the LCD at any time by keypad selection, or transferred to the PC via the serial service interface. Readout of
indications during operation is described in detail in the SIPROTEC 4 System Description.
2.22
2.22.1
2.22.1.1
Functions
2.22 Auxiliary Functions
276 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016