Function Description Trigger Power Swing - Siemens SIPROTEC 5 Manual

Fault Recorder
7.5 Trigger Functions 3-Phase
Parameter: dM/dt Rise Active - dM/dt Rise (/Filter Time) - dM/dt Rise Hysteresis - Filter Time
•
Default setting (_:10021:103) dM/dt rise active = no
•
Default setting (_:10021:107) dM/dt rise (/Filter time) = 34.641 VA
•
Default setting (_:10021:115) dM/dt rise hysteresis = 0.980 p.u.
•
Default setting (_:10021:112) Filter time = 2 periods
With the dM/dt rise active parameter, you activate the gradient trigger in order to monitor the positive
gradients of the sum apparent power using the set filtering time (input in periods).
Parameter Value
yes
no
The hysteresis is preset at the factory to 0.980 p.u. (equal to 2 %) of the parameter dM/dt rise (/Filter
time) and can be adjusted.
Parameter: dM/dt Drop Active - dM/dt Drop (/Filter Time) - dM/dt Drop Hysteresis - Filter Time
•
Default setting (_:10021:104) dM/dt drop active = no
•
Default setting (_:10021:108) dM/dt drop (/Filter time) = 34.641 VA
•
Default setting (_:10021:116) dM/dt drop hysteresis = 0.980 p.u.
•
Default setting (_:10021:112) Filter time = 2 periods
With the dM/dt drop active parameter, you activate the gradient trigger in order to monitor the negative
gradients of the sum apparent power using the set filtering time (input in periods).
Parameter Value
yes
no
The hysteresis is preset at the factory to 0.980 p.u. (equal to 2 %) of the parameter dM/dt drop (/Filter
time) and can be adjusted.
7.5.4.7

Function Description Trigger Power Swing

Power Swings
Power swings are created by temporary angle deviations of the supplying generators, for example, due to
faults or load shedding. The following figure shows the network section involved with the supplying genera-
tors A and B and the power-swing center. The term "power-swing center" describes the location on a line at
which the voltage dip is greatest during a power swing.
342
Description
The positive gradient of the sum apparent power is monitored.
The positive gradient of the sum apparent power is not monitored.
Description
The negative gradient of the sum apparent power is monitored.
The negative gradient of the sum apparent power is not monitored.
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017