N
CTR
— Transformation ratio of the current transformer
N
VTR
— Transformation ratio of the voltage transformer
Calculation example:
In the following, the same line as illustrated in the example for ground impedance ratios (above) and addi-
tional data on the voltage transformers will be used:
Current Transformers
500 A/5 A
Voltage Transformers
20 kV/0.1 kV
The secondary reactance per unit length is calculated as follows:
[xsekund-beispiel-260602-kn, 1, en_US]
Line Angle (only for Fault Location)
The setting of the line angle is only important for the utilization of the line fault location function. The line
angle can be derived from the line constants. The following applies:
[formel-allg-ltgdaten-1-oz-310702, 1, en_US]
with R
L
being the ohmic resistance and X
L
being the reactance of the line.
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
2
with the following data:
R'
1
= 0.19 Ω/km (0.31 Ω/mile)
X'
1
= 0.42 Ω/km (0.69 Ω/mile)
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:
Functions
2.1 General
SIPROTEC 4, 7SJ62/64, Manual
53
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
Page 8: ...8 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...
Page 18: ...18 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...
Page 30: ...30 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...
Page 540: ...540 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...
Page 594: ...594 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...
Page 720: ...720 SIPROTEC 4 7SJ62 64 Manual C53000 G1140 C207 8 Edition 08 2016 ...