Rate-Of-Frequency-Change Protection Df/Dt (Ansi 81R) - Siemens Siprotec 7UM611 Manual

4 Technical Data
4.14

Rate-of-Frequency-Change Protection df/dt (ANSI 81R)

Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
328
Stages, can be +df/dt> or –df/dt
Pickup values df/dt
Delay times T
Undervoltage Blocking U1>
Window Length
Pickup Times df/dt
Dropout Times df/dt
Dropout Difference ∆f/dt
Dropout Ratio
Frequency Rise
–Measuring Window < 5
– Measuring Window ≥ 5
Undervoltage Blocking
Delay Times
Power Supply DC Voltage in Range
0.8 ≤ U ≤ 1.15
/U
PS PSN
Temperature in Range
23°F or –5 °C ≤ Θ ≤ 131°F or 55 °C
amb
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
4
0.1 to 10 Hz/s Increments 0.1 Hz/s
0.00 to 60.00 s Increments 0.01 s
or ineffective
10.0 to 125.0 V Increments 0.1 V
1 to 25 cycles
Approx. 150 ms to 500 ms
(dep. on window length)
approx. 150 ms to 500 ms
(dep. on window length)
0.02 to 0.99 Hz/s (settable)
approx. 1.05
approx. 5 % or 0.15 Hz/s at U > 0.5 U
approx. 3 % or 0.1 Hz/s at U > 0.5 U
1 % of setting value or 0.5 V
1 % or 10 ms
≤ 1 %
≤ 0.5 % / 10 K
≤ 1 %
≤ 1 %
C53000-G1176-C127-3
N
N
7UM61 Manual