Siemens 6MD86 - Instantaneous High-Current Tripping

Instantaneous High-Current Tripping
Setting Values
Threshold value 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
1 A @ 50 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 50 Irated 0.15 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Dropout ratio 0.50 to 0.90 Increments of 0.01
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 overcurrent and of 105 % for undercur-
rent functionality.
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)
Times
Operate time for current > 2·√2·threshold value
Approx. 8 ms + OOT
64
Tolerances
Response tolerance, current
5 % of setting value or 10 mA
at I
rated
= 1 A
5 % of setting value or 50 mA
at I
rated
= 5 A
Time delays 1 % of the setting value or 10 ms
11.13
64
OOT (Output Operating Time) Additional delay of the output medium used, see Chap. 11.1.4 Relay Outputs
Technical Data
11.13 Instantaneous High-Current Tripping
1142 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017