Configuring Settings-Free Power Swing Detection
The power swing detection based on superimposed current requires no system study. You just need to decide
whether a zone should be blocked or allowed to trip if a power swing is detected. You do this zone by zone using
the zone specific settings. For example the zone 1 setting is Zone 1 Ph. PSB. The available options are Blocking,
Allow Trip, or Delayed Unblock.
3.1.1.1 TIMING OF THE PHASE SELECTOR SIGNALS
Start of
power swing
i (t)
3 cycles
PH1
PH2
t1: D i exceeds threshold 1 (5%In), so PH1 and PH2 go high
t
2
: Threshold 2 invoked. PH2 goes low on account of threshold being increased . PH1 remains high,
because there continues to be a D i
t
3
: PH1 goes low as power swing has diminished and D i goes below threshold 1
t1 t2
t
3
End of
power swing
V02769
Figure 149: Phase selector timing for power swing condition
P543i/P545i Chapter 10 - Power Swing Functions
P54x1i-TM-EN-1 273
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