Functions
2.15 Flexible Protection Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
232
Table 2-16 Parameter in the Setting Dialog "Measurement Procedure", Mode of Operation 1-phase
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.
Via parameter PICKUP WITH it is determined whether the function must be triggered on exceeding or under-
shooting of the set threshold value.
Mode of
Operation
Measured
Variable
Notes
Single-phase Current,
voltage
Parameter
MEAS. METHOD
Setting Options
Fundamental Harmonic Only the fundamental harmonic is evaluated, higher harmonics
are suppressed. This is the standard measurement procedure of
the protection functions.
True RMS The „True“ RMS value is determined, i.e. higher harmonics are
evaluated. This procedure is applied, for example, if a simple
overload protection is to be implemented on the basis of a current
measurement, as the higher harmonics contribute to thermal
heating.
Current Parameter CURRENT
Setting Selection
IA
IB
IC
IN
INS
IN2
It is determined which current measuring channel is evaluated by
the function. Depending on the device version, either IN (normal-
sensitive ground current input), INS (sensitive ground current
input) or IN2 (second ground current connected to the device)
can be selected.
If parameter 251 is set to A,G2,C,G; G2->B, the setting IN refers
to the current at the second current (IN2). The setting INS refers
to the sensitive ground current at the fourth current input.
If parameter 251 is set to A,G2,C,G; G->B, the setting IN2 refers
to the current at the second current (IN2). The setting INS or INS
refers to the sensitive or highly sensitive ground current at the
fourth current input.
Voltage Parameter VOLTAGE
Setting Selection
VAB
VBC
VCA
VAN
VBN
VCN
VN
Vx
It is determined which voltage-measuring channel is evaluated
by the function. When selecting phase-to-phase voltage, the
threshold value must be set as a phase-to-phase value, when se-
lecting a phase-to-Ground variable as phase-to-Ground voltage.
The extent of the setting texts depends on the connection of the
voltage transformer (see address 213 VT Connect. 3ph).
P forward,
P reverse,
Q forward,
Q reverse
Parameter POWER
Setting Selection
IA VAN
IB VBN
IC VCN
It is determined which power-measuring channel (current and
voltage) is evaluated by the function. The extent of the setting
texts depends on the connection of the voltage transformer (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 VCA is calcu-
lated from VAB and VBC.
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