Siemens 6MD85, Manual

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General Functionality
Measured-Value Selection
Logic
The function provides the option to select between the values
IN measured
or
3I0 calculated
.
[loMasValue-201505-01.vsd, 1, en_US]
Figure 7-104 Logic Diagram of Measured-Value Selection
Both options are only available for the current-transformer connection types
3-phase + IN
and
3-phase +
IN-separate
. For other connection types respectively, only one option is possible. If you select an option
that is not allowed, an inconsistency message is given.
Depending on the CT secondary rated current, the CT connection type, and the selected setting, the secondary
threshold setting range varies according to the following table.
Table 7-4 Threshold Setting Range
Connec-
tion Type Measured
Value CT Terminal Type Threshold
Setting Range
(rated I-sec.:
ph = 1 A, IN = 1
A) Threshold
Setting Range
(rated I-sec.:
ph = 1 A, IN = 5
A) Threshold
Setting Range
(rated I-sec.:
ph = 5 A, IN = 1
A) Threshold
Setting Range
(rated I-sec.:
ph = 5 A, IN = 5
A)
3ph + IN
3I0 calculated 4 * Protection 0.030 A to
35.000 A N/A N/A 0.15 A to
175.00 A
4 * Measurement 0.001 A to
1.600 A N/A N/A 0.005 A to
8.000 A
IN measured 4 * Protection 0.030 A to
35.000 A N/A N/A 0.15 A to
175.00 A
4 * Measurement 0.001 A to
1.600 A N/A N/A 0.005 A to
8.000 A
3ph + IN-separate
3I0 calculated 4 * Protection 0.030 A to
35.000 A 0.030 A to
35.000 A 0.15 A to
175.00 A 0.15 A to
175.00 A
3 * Protection, 1 *
sen. 0.030 A to
35.000 A 0.030 A to
35.000 A 0.15 A to
175.00 A 0.15 A to
175.00 A
4 * Measurement 0.001 A to
1.600 A 0.001 A to
1.600 A 0.005 A to
8.000 A 0.005 A to
8.000 A
IN measured 4 * Protection 0.030 A to
35.000 A 0.15 A to
175.00 A 0.030 A to
35.000 A 0.15 A to
175.00 A
3 * Protection, 1 *
sen. 0.001 A to
1.600 A 0.005 A to
8.000 A 0.001 A to
1.600 A 0.005 A to
8.000 A
4 * Measurement 0.001 A to
1.600 A 0.005 A to
8.000 A 0.001 A to
1.600 A 0.005 A to
8.000 A
7.7.3
7.7.3.1
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
702 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017