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6.12 Power swing logic ZMRPSL
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing logic ZMRPSL - -
6.12.1 Introduction
Power Swing Logic (ZMRPSL) is a complementary function to Power Swing
Detection (ZMRPSB,68) function. It provides possibility for selective tripping of faults
on power lines during system oscillations (power swings or pole slips), when the
distance protection function should normally be blocked. The complete logic consists
of two different parts:
• Communication and tripping part: provides selective tripping on the basis of
special distance protection zones and a scheme communication logic, which are
not blocked during the system oscillations.
• Blocking part: blocks unwanted operation of instantaneous distance protection
zone 1 for oscillations, which are initiated by faults and their clearing on the
adjacent power lines and other primary elements.
6.12.2 Principle of operation
6.12.2.1 Communication and tripping logic
Communication and tripping logic as used by the power swing distance protection
zones is schematically presented in figure
189 .
Section 6
1MRK505222-UUS C
Impedance protection
356
Technical reference manual