Siemens 7SC80 Manual page 67

[formel-allg-ltgdaten-1-oz-310702, 1, en_US]
with R being the ohmic resistance and X
L
The value under address 1109 applies if only one line section is available and to all faults that occur outside
the defined line sections.
If several line sections are set, the following shall apply:
•
for line section 1, address 6005
•
for line section 2, address 6015
•
for line section 3, address 6025
This data can be used for the entire line or line section, or as distance-related values, since the quotients are
independent of the distance. It is also irrelevant whether the quotients were derived from primary or secon-
dary values.
Calculation Example::
110 kV free line 150 mm
R' = 0.19 Ω/km (0.31 Ω/mile)
1
X' = 0.42 Ω/km (0.69 Ω/mile)
1
The line angle is calculated as follows:
[formel-allg-ltgdaten-2-oz-310702, 1, en_US]
The respective address must be set to Line angle = 66°.
Line Length (only for Fault Location)
The setting of the line length is only important for the utilization of the line fault location function. The line
length is required so that the fault location can be given as a reference value (in %). Furthermore, when using
several line sections, the respective length of the individual sections is defined.
The values under address 1110 (km) or 1111 (Miles apply if only one line section is available and to all faults
that occur outside the defined line sections.
If several line sections are set, the following shall apply:
•
for line section 1, addresses 6006 (km) or 6007 (Miles)
•
for line section 2, addresses 6016 (km) or 6017 (Miles)
•
for line section 3, addresses 6026 (km) or 6027 (Miles)
The length set for the entire line must correspond to the sum of lengths configured for the line sections. A
deviation of 10% max. is admissible.
Inverting Power Measured Values/Metered Values
The directional values (power, power factor, work and related min., max., mean and setpoint values), calcu-
lated in the operational measured values, are usually defined a positive in the direction of the protected
object. This requires that the connection polarity for the entire device was configured accordingly in the
P.System Data 1 (compare also "Polarity of the Current Transformers", address 201). But it is also possible
to make different settings for the "forward" direction" for the protection functions and the positive direction
for the power etc., e.g. to have the active power supply (from the line to the busbar) displayed positively. To
do so, set address 1108 P,Q sign to reversed. If the setting is not reversed (default), the positive
direction for the power etc. corresponds to the "forward" direction for the protection functions. Section
4 Technical Data
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
being the reactance of the line.
L
2 with the following data:
provides a detailed list of the values in question.
Functions
2.1 General
67