Siemens SIPROTEC 4 7VE61 User Manual

Rate-of-frequency-change protection
Setting Ranges/Increments
Stages, can be +df/dt>, –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
Length of the measuring window 1 to 25 cycles
Times
Pickup and Dropout Time df/dt approx. 200 ms to 700 ms at f
N
= 50/60 Hz
(dep. on window frequency and length)
approx. 600 ms to 2100 ms at f
N
= 16.7 Hz
(dep. on window frequency and length)
Dropout Ratio
Dropout Difference Δf/dt 0.02 Hz/s to 0.99 Hz/s (adjustable)
Dropout Ratio approx. 1.05
Tolerances
Frequency Rise
- Measuring Window < 5 approx. 5 % or 0.15 Hz/s at U > 0.5 U
N
- Measuring Window ≥ 5 approx. 3 % bzw. 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
Influencing Variables for Pickup Values
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 %
4.7
Technical Data
4.7 Rate-of-frequency-change protection
SIPROTEC 4, 7VE61 and 7VE63, Manual 209
C53000-G1176-C163-3, Edition 10.2017

Siemens SIPROTEC 4 7VE61 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7VE61
Category	Power distribution unit
Language	English