Siemens SIPROTEC 4 7UT6 Series Manual page 36

Functions
2.1 General
Overvoltage Protection
The overvoltage protection (address 153 OVERVOLTAGE) protects the system from impermissible voltage
increases, thus avoiding damage to its insulation. It can only be used in three-phase protected objects, thus
not at address 105 PROT. OBJECT = 1 phase transf. or 1ph Busbar. It is normally only possible in
device variant that have a voltage measuring input.
Frequency Protection
The frequency protection (address 156 FREQUENCY Prot.) has the task to detect increased or decreased
frequencies in the power station sector. It can be applied, for example, as load shedding in the system. It can
only be used in three-phase protected objects, thus not at address 105 PROT. OBJECT = 1 phase transf.
or 1ph Busbar. As the frequency is derived from the measuring voltage, this is only possible in device
versions with voltage measuring inputs.
Circuit-breaker failure protection
The circuit-breaker protection (address 170 BREAKER FAILURE) is applicable to any circuit breaker. The
assignment is carried out at a later stage. Note that in a single-phase busbar protection (address 105 PROT.
OBJECT = 1ph Busbar) it is not possible.
Circuit breaker failure protection 2
The devices 7UT613/63x have a second curcuit breaker failure protection (address 171 BREAKER FAIL. 2)
for another circuit breaker of the system. The same as was specified for the first one applies here as well.
Measuring Location Disconnection
The disconnection of the measuring location (address 180 DISCON.MEAS.LOC) is a help function for commis-
sioning and revision works in the system.
Measured Value Monitoring
The different methods of measured value monitoring (address 181 M.V. SUPERV) are set out in detail in
Section 2.19.1 Measurement
voltage inputs.
Trip Circuit Supervision
For trip circuit monitoring, under address 182 Trip Cir. Sup., a selection can be made with regard to
operation with two binary inputs (2 Binary Inputs) or only one binary input (1 Binary Input). The
inputs must be potentialfree.
External Trip Command
The possibilities of two trip commands from external sources can be configured in addresses 186 EXT. TRIP
1 and 187 EXT. TRIP 2.
Flexible Functions
The devices 7UT613/63x have flexible functions that can be used for protection, monitoring or measuring
tasks. If you wish to use such functions, please create them here. Options are
up to 12 flexible protection and monitoring functions are possible,
up to 20 average values from measured values or calculated values and
up to 20 minimum or maximum values for measured values or calculated values.
At this point, only select the respective required number. The configuration of this function, i.e. which input
variables are most relevant, and the setting of function parameters is carried out at a later stage, see Section
2.22.7 Flexible
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Supervision. Voltages can of course also be monitored if the device provides
Function.
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016