Technical Data
4.19 Rate-of-Frequency-Change Protection df/dt (ANSI 81R)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
494
4.19 Rate-of-Frequency-Change Protection df/dt (ANSI 81R)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
Stages, can be +df/dt> or –df/dt 4
Pickup values df/dt 0.1 Hz/s to 10.0 Hz/s Increments 0.1 Hz/s
Delay times T 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Undervoltage blocking U1> 10.0 V to 125.0 V
or 0 (ineffective)
Increments 0.1 V
Window Length 1 to 25 cycles
Pickup Times df/dt approx.. 150 ms to 500 ms (dep. on window length)
Dropout Times df/dt approx. 150 ms to 500 ms (dep. on window length )
Dropout Difference Δf/dt 0.02 Hz/s to 0.99 Hz/s (adjustable)
Dropout Ratio approx. 1.05
Frequency Rise
–Measuring Window < 5 Approx. 5 % or 0.15 Hz/s at U > 0,5 U
N
– Measuring Window ≥ 5 Approx. 3 % or 0.1 Hz/s at U > 0,5 U
N
Undervoltage Blocking 1 % of setting value or 0.5 V
Delay Times 1 % or 10 ms
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) ≤ 0.5 % / 10 K
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
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