Functions
2.13 Flexible Protection Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
213
Table 2-13 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 harmon-
ics are suppressed. This is the standard measurement proce-
dure 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 contrib-
ute to thermal heating.
Current Parameter CURRENT
Setting Selection
IA
IB
IC
IN
INS
IN2
It is determined which current measuring channel is evaluat-
ed 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 connect-
ed 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 evaluat-
ed by the function. When selecting phase-to-phase voltage,
the threshold value must be set as a phase-to-phase value,
when selecting 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 trans-
former (see address 213 VT Connect. 3ph). When selecting
Vab, Vbc, VGnd, the phase-to-Ground voltages will be calcu-
lated if „phase-to-Ground“ is configured. When selecting
„phase-to-phase“, the connected phase-to-phase voltages
are used and VCA is calculated from VAB and VBC.
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