Siemens SIPROTEC 4 7UT6 Series Manual page 20

Introduction
1.2 Application Scope
can occur especially in power stations following (full) load shutdown and/or frequency reduction, is thus
detected.
An undervoltage and overvoltage protection is to be integrated into devices with voltage measuring inputs. A
4-stage frequency protection monitors the frequency from the measured voltages.
A version for two-phase application is available for traction supply (transformers or generators) which provides
all functions suited for this application (differential protection, restricted earth fault protection, overcurrent
protection, overload protection).
A circuit breaker failure protection checks the reaction of one circuit breaker after a trip command.
Further-reaching protection, monitoring and measuring functions can be configured individually by means of
flexible functions. For up to 12 such functions, you determine yourself which measuring quantities to process
and how to process them, and also which reactions the device is to trigger when settable limit values are
overor undershot. Thus you can, for instance, create further time overcurrent protection functions and process
voltages, powers or symmetrical components.
One can configure the calculation of minimum, maximum and/or average values and/or minimum, maximum
of the average values of up to 20 selectable measured quantities, thus receiving one's own statistical data.
For the devices 7UT613, 7UT633 and 7UT635, you can optionally create some protective functions several
times and assign them flexibly to the measuring locations of the protected object. Examples: Time overcurrent
protection, breaker failure protection, and the like (see Technical Data).
20 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016