Siemens Siprotec 5 7SS85 - Stage with Inverse-Time Characteristic Curve

Stage with Inverse-Time Characteristic Curve
Setting Values
Method of measurement Fundamental component
RMS value
–
Threshold value
24
1 A @ 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
Dropout Disk emulation
Instantaneous
–
Time multiplier 0.00 to 15.00 Increments of 0.01
Minimum time of the curve 0.00 s to 1.00 s Increments of 0.01 s
Additional time 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
95 % of 1.1 ⋅ threshold value
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Reset of the Integration Timer
Instantaneous
With dropout
Disk emulation
Approx. < 0.90 ⋅ threshold value
Operate Curves and Dropout-Time Characteristic Curves According to IEC
Extension of the operate time during operation with
transformer inrush-current detection
Approx. 10 ms
11.18
24
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
Technical Data
11.18 Stage with Inverse-Time Characteristic Curve
590 SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016