Siemens SIPROTEC 7UT613 series Manual page 27

Frequency Protec-
tion (devices with
measured voltage
inputs)
Circuit Breaker
Failure Protection
External Direct Trip
Processing of ex-
ternal information
Flexible Functions
7UT613/63x Manual
C53000-G1176-C160-2
• Three underfrequency stages and one overfrequency stage
• Frequency measurement via the positive sequence component of the voltages
• Insensitive to harmonics and abrupt phase angle changes
• Adjustable undervoltage threshold
• With monitoring of current flow through each breaker pole on any side of the pro-
tected object
• Supervision of the breaker position possible (if breaker auxiliary contacts or feed-
back signal available)
• Initiation by each of the internal protection functions
• Start by external trip functions possible
• Single-stage or two-stage
• Short dropout and overshoot times
• 2 breaker failure protection functions are possible
• 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
• 2 breaker failure protection functions possible
• Inclusion of external signals (user defined information) in internal information pro-
cessing
• 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
• Up to 12 individually configurable protection or monitoring functions
• Input quantities can be selected from all the connected 3-phase or 1-phase mea-
sured quantities
• Also possible from the measured or combined input quantities: symmetrical compo-
nents, power components, frequency
• Standard logic with supervision of the input quantities to over/undershooting of an
adjustable limit value
• Settable time and dropout delay
• External blocking via „Blocking on Measured Quantities Failure" parameterisable
• Editable message texts
• Additional determination and output of up to 20 mean values from measured quan-
tities or calculated values
• Additional determination and output of up to 20 mean values from measured quan-
tities or calculated values
1.3 Characteristics
27