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Half-cycle RMS current of phase (i+1) with i X [0; 2].
To avoid missing any fault, these values are calculated for each half-cycle.
A.1.2.2 MINIMUM AND MAXIMUM HALF-CYCLE RMS VALUES (EXCLUDING NEUTRAL)
Min and max RMS phase-to-neutral voltages of phase (i+1) with i ∈ [0 ; 2].
Vmax [i] = max(Vhalf[i]),
Min and max RMS phase-to-phase voltages of phase (i+1) with i ∈ [0 ; 2].
Umax [i] = max(Uhalf[i]),
Min and max RMS currents of phase (i+1) with i ∈ [0 ; 2].
Amax [i] = max(Ahalf[i]),
NOTE: The duration of the evaluation is left to the user's discretion (reset by pressing the
mode).
A.1.2.3 SEVERITY OF SHORT-TERM FLICKER – 10 MINUTES (EXCLUDING NEUTRAL)
Method based on the IEC 61000-4-15 standard.
The input values are half-period RMS voltages (phase-to-neutral for distribution systems with neutral, phase-to-phase for
distribution systems without neutral). Blocks 3 and 4 are generated digitally. The classifier of block 5 has 128 levels.
The value of PST[i] is updated every 10 minutes (phase (i+1) with i ∈ [0 ; 2]).
NOTE: The user can reset the PST calculation by pressing the
A.1.2.4 SEVERITY OF LONG-TERM FLICKER – 2 HOURS (EXCLUDING NEUTRAL)
Method based on the IEC 61000-4-15 standard.
The values of PST[i][n] are consecutive and 10 minutes apart. The value of PLT[i] (phase (i+1) with i ∈ [0; 2]) calculated in
a two-hour window is updated either:
■ every 10 minutes (sliding long-term flicker: Configuration > Calculation methods > PLT)
■ or every 2 hours (non-sliding long-term flicker: Configuration > Calculation methods > PLT)
NOTE: The user can reset the PST calculation by pressing the
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Vmin[i] = min(Vhalf[i])
Umin[i] = min(Uhalf[i])
Amin[i] = min(Ahalf[i])
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