Siemens SIPROTEC 4 7UT6 Series Manual page 25

•
Insensitive to harmonics and abrupt phase angle changes
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Adjustable undervoltage threshold
Circuit Breaker Failure Protection
•
With monitoring of current flow through each breaker pole on any side of the protected object
•
Supervision of the breaker position possible (if breaker auxiliary contacts or feedback signal available)
•
Initiation by each of the internal protection functions
•
Start by external trip functions possible
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Single-stage or two-stage
•
Short dropout and overshoot times
•
2 breaker failure protection functions possible (only 7UT613/63x)
External Direct Trip
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Tripping of either circuit breaker by an external device via binary inputs
•
Inclusion of external commands into the internal processing of information and trip commands
•
With or without trip time delay
Processing of external information
•
Inclusion of external signals (user defined information) in internal information processing
•
Pre-defined transformer annunciations for Buchholz protection and oil gassing
•
Transmission to output relays, LEDs, and via serial system interfaces to central control and data storage
facilities
Flexible functions (only 7UT613/63x)
•
Up to 12 individually configurable protection or monitoring functions
•
Input quantities can be selected from all the connected 3-phase or 1-phase measured quantities
•
Also possible from the measured or combined input quantities: symmetrical components, power compo-
nents, frequency
•
Standard logic with supervision of the input quantities to over/undershooting of an adjustable limit value
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Settable time and dropout delay
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External blocking via "Blocking on Measured Quantities Failure" parameterisable
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Editable message texts
•
Additional determination and output of up to 20 minimum or maximum values from measured quantities
or calculated values
•
Additional determination and output of up to 20 mean values from measured quantities or calculated
values
User-defined Logic Functions (CFC)
•
Freely programmable combination of internal and external signals for the implementation of user-
defined logic functions
•
All typical logic functions
•
Time delays and limit value inquiries
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Introduction
1.3 Characteristics
25