Where
R
0
– Zero sequence resistance of the line
X
0
– Zero sequence reactance of the line
R
1
– Positive sequence resistance of the line
X
1
– Positive sequence reactance of the line
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.
Calculation example:
20 kV free line 120 mm
2
with the following data:
R
0
/s = 0.88 Ω/km (1.42 Ω/mile)
Zero sequence resistance
X
0
/s = 1.26 Ω/km (2.03 Ω/mile)
Zero sequence reactance
R
1
/s = 0.24 Ω/km (0.39 Ω/mile)
Positive sequence resistance
X
1
/s = 0.34 Ω/km (0.55 Ω/mile)
Positive sequence reactance
For ground impedance ratios, the following results:
[formfehl-260602-kn, 1, en_US]
Reactance per Unit Length (only for Fault Location)
The setting of the reactance per unit length is only important for the utilization of the line fault location func-
tion. The reactance setting enables the protective relay to indicate the fault location in terms of distance.
The reactance value X' is entered as a reference value
x'
, i.e. in Ω/mile if set to distance unit
Miles
(address
215, see Section
under "Distance Unit") or in Ω/km if set to distance unit
km
. If, after
having entered the reactance per unit length, the distance unit is changed under address 215, the reactance
per unit length must be reconfigured in accordance with the new distance unit.
The values under address 1106 (
km
) or 1105 (
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 6004(
km
) or 6003 (
Miles
)
•
for line section 2, addresses 6014 (
km
) or 6013 (
Miles
),
•
for line section 3, addresses 6024 (
km
) or 6023 (
Miles
).
When setting the parameters in DIGSI, the values can also be entered as primary values. In that case the
following conversion to secondary values is not required.
For the conversion of primary values to secondary values the following applies in general:
[zsekundaer-260602-kn, 1, en_US]
Likewise, the following applies to the reactance per unit length of a line:
[xsekundaer-260602-kn, 1, en_US]
with
Functions
2.1 General
52
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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