Siemens 7SC80 Manual page 332

Functions
2.19 Flexible Protection Functions
Parameter OPERRAT. MODE = 1-phase
Ia
Ib
Ic
In
In sensitive
In2
Parameter MEAS. QUANTITY = Voltage
Parameter VOLTAGE
Va-n
Vb-n
Vc-n
Va-b
Vb-c
Vc-a
Vn
Parameter MEAS. QUANTITY = Voltage Side2
Parameter VOLTAGE
V2an
V2bn
V2cn
V2a2b
V2b2c
V2c2a
V2n
Parameter MEAS. QUANTITY = P forward or P reverse or Q forward or Q reverse or Power factor
Parameter POWER
Ia Va-n
Ib Vb-n
Ic Vc-n
The forward direction of power (P forward, Q reverse) is the direction of the line. Parameter (1108 P,Q sign)
for sign inversion of the power display in the operating measured values is ignored by the flexible functions.
In single-phase voltage protection, the configured voltage threshold is always interpreted as voltage at the
terminal. The parameterization in 213 VT Connect. 3ph (see
is ignored here.
Via parameter PICKUP WITH it is determined whether the function must be triggered on exceeding or under-
shooting of the set threshold value.
Settings
The pickup thresholds, time delays and dropout ratios of the flexible protection function are set in the
"Settings" dialog box in DIGSI.
The pickup threshold of the function is configured via parameter P.U. THRESHOLD. The OFF-command time
delay is set via parameter T TRIP DELAY. Both setting values must be selected according to the required
application.
The pickup can be delayed via parameter T PICKUP DELAY. This parameter is usually set to zero (default
setting) in protection applications, because a protection function should pick up as quickly as possible. A
setting deviating from zero may be appropriate if a trip log is not desired to be started upon each short-term
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It is determined which current-measuring channel must be evaluated by the function.
It is determined which voltage-measuring channel must be evaluated by the function.
When selecting a phase-to-phase voltage, the threshold value must be set as a phase-to-
phase value. When selecting a phase-to-ground voltage, the threshold value must be set
as a phase-to-ground voltage. The extent of the setting texts depends on the connection
of the voltage transformer (see address 213 VT Connect. 3ph).
It is determined which voltage-measuring channel must be evaluated by the function.
When selecting a phase-to-phase voltage, the threshold value must be set as a phase-to-
phase value. When selecting a phase-to-ground voltage, the threshold value must be set
as a phase-to-ground voltage. The extent of the setting texts depends on the connection
of the voltage transformer (see address 219 VT Con. 3ph S2).
It is determined which power-measuring channel (current and voltage) must be evaluated
by the function. With phase-to-phase voltage connections the parameter is hidden (see
address 213 VT Connect. 3ph).
When selecting Vab, Vbc, VGnd, the phase-to-ground voltages will be calculated if
phase-to-ground is configured. When selecting phase-to-phase, the connected phase-
to-phase voltages are used and V is calculated from V and V
CA AB
Voltage Connection (Power System), Page
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
.
BC
49)