Other Monitoring Functions That Can Be Activated; Cosinus Phi Display Function Module - Siemens SINAMICS S120 System Manual

5.3.3.5

Other monitoring functions that can be activated

Monitoring additional voltage/frequency thresholds when switching on or switching on again
Some individual grid codes specify that when switching on or switching on again, before the
operating enable, the voltage and/or the frequency must be additionally checked.
While the test is being conducted, it is monitored that voltage and frequency thresholds are
complied with.
For a regular switch-on operation, the test duration is set using p5545[6], For an automatic
restart, a separate test duration is entered (p5545[7]).
5.3.4

Cosinus phi display function module

Background
Active Line Modules have, in the basic configuration, the smoothed power factor available as
a display variable (r0038).
In this case, power factor λ is defined as quotient
However, grid codes and technical directives for power generating units also specify that the
displacement factor (also: cosφ) is evaluated.
Contrary to the power factor, the displacement factor is defined as
The basic fundamentals of the voltages and currents are used as basis to calculate the
apparent power S
harmonic reactive power is not equal to zero, then the following applies: λ < cosφ
power factor indicated in r0038 is poorer than the actual cosφ.
Further, generally, the displacement factor for the connection point of the complete system
must be specified. For example, for an upstream transformer, this point can differ electrically
from the connection terminals of the line filter, which are used as basis for r0038.
The "Cosinus phi display" that can be optionally activated, allows the calculation of the cosφ
value to be flexibly configured.
Grid infeed
System Manual, 04/2015, A5E03347436A
(just the same as for the active power according to the definition). If the
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Function modules
5.3 Description of the function modules
, and the
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45