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Functions
2.2 Phase Comparison Protection and Ground Differential Protection
If the pickup is successful, an internal pickup signal is transmitted to the other device.
The element Ιdyn is blocked if the frequency deviates by more than 10 % from the rated frequency.
The function is blocked if the communication between the two devices at the ends of the protected object
fails for more than two measuring cycles.
This function can also be blocked via binary input
The following figure shows the formation of the phase-specific pickup of the elements 87L Isteady> and
87L Idyn>.
[lo-pvl-anr-20101117, 1, en_US]
Figure 2-5
The pickup signals created locally, signs of idyn and istat and the blocking information are sent to the device at
the opposite end.
50
Logic diagram of the phase comparison protection, phase-selective generation of the Ιstat and
Ιdyn signal
>87L block .
E50417-G1100-C474-A2, Edition 02.2018
SIPROTEC 4, 7SD80, Manual
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