Siemens 6MD85, Manual

Page: 1145 / 1256

Stage with Inverse-Time Characteristic Curve
Setting Values
Method of measurement Fundamental component
RMS value –
Threshold value 67
For I
rated
= 1 A 0.030 A to 35.000 A Increments of 0.001 A
For I
rated
= 5 A 0.15 A to 175.00 A Increments of 0.01 A
Dropout Disk emulation
Instantaneous –
Time multiplier 0.05 to 15.00 Increments of 0.01
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 Characteristic Curves According to IEC
Extension of the operate time during operation with
transformer inrush-current detection Approx. 10 ms
The operate curves and dropout characteristic curves according to IEC can be found in the Technical Data
chapter under Inverse-Time Overcurrent Protection.
Operate Curves and Dropout Characteristic Curves According to ANSI/IEEE
The operate curves and dropout characteristic curves according to ANSI/IEEE can be found in the Technical
Data chapter under Inverse-Time Overcurrent Protection.
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 Active
11.15
67 If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
Technical Data
11.15 Stage with Inverse-Time Characteristic Curve
SIPROTEC 5, High-Voltage Bay Controller, Manual 1145
C53000-G5040-C015-9, Edition 11.2017