Siemens 7SK80 Manual page 232

Functions
2.15 Flexible Protection Functions
Table 2-16 Parameter in the Setting Dialog "Measurement Procedure", Mode of Operation 1-phase
Mode of Measured
Operation Variable
Single-phase Current,
voltage
Current
Voltage
P forward,
P reverse,
Q forward,
Q reverse
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.
232
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.
Parameter CURRENT
Setting Selection
IA It is determined which current measuring channel is evaluated by
IB the function. Depending on the device version, either IN (normal-
IC sensitive ground current input), INS (sensitive ground current
IN input) or IN2 (second ground current connected to the device)
INS can be selected.
IN2 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.
Parameter VOLTAGE
Setting Selection
VAB It is determined which voltage-measuring channel is evaluated
VBC by the function. When selecting phase-to-phase voltage, the
VCA threshold value must be set as a phase-to-phase value, when se-
VAN lecting a phase-to-Ground variable as phase-to-Ground voltage.
VBN The extent of the setting texts depends on the connection of the
VCN voltage transformer (see address 213 VT Connect. 3ph).
VN
Vx
Parameter POWER
Setting Selection
IA VAN It is determined which power-measuring channel (current and
IB VBN voltage) is evaluated by the function. The extent of the setting
IC VCN 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.
Notes
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012