Siemens Siprotec 5 7SS85 Techical Data

Rate of Frequency Change Protection
Setting Values for the Function
Minimum voltage 3.000 V to 175.000 V Increments of 0.001 V
Measuring window 2 periods to 5 periods Increments of 1 period
Setting Values for Stage Types
Threshold 0.1 Hz/s to 20.0 Hz/s Increments of 0.1 Hz/s
Dropout differential 0.02 Hz/s to 0.99 Hz/s Increments of 0.01 Hz/s
Operate delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for the overvoltage and of 105 % for the
undervoltage functionality.
Minimum absolute dropout differential 150 mV sec.
Times
Pickup time
Approx.165 ms to 225 ms (depends on measuring window length)
Dropout time Approx.165 ms to 225 ms (depends on measuring window length)
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Inactive
Tolerances
Threshold,
measuring window > 3 periods
Approx. 3 % or 0.06 Hz/s
Threshold,
measuring window ≤ 3 periods
Approx. 5 % or 0.06 Hz/s
Minimum voltage 1 % of the setting value or 0.5 V
Time delays 1 % of the setting value or 10 ms
Functional Measured Value
Value
Description
df/dt Calculated rate of frequency change
11.29
Technical Data
11.29 Rate of Frequency Change Protection
610 SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016

Siemens Siprotec 5 7SS85 Specifications

General

Brand	Siemens
Model	Siprotec 5 7SS85
Category	Industrial Equipment
Language	English