2.1 General
47
7SA522 Manual
C53000-G1176-C155-3
2.1.4.4 Information List
2.1.5 Power System Data 2
The general protection data (36\VWHP'DWD) include settings associated with all
functions rather than a specific protection, monitoring or control function. In contrast
to the 36\VWHP'DWD as discussed before, these can be changed over with the
setting groups and can be configured via the operator panel of the device.
2.1.5.1 Setting Notes
Rating of the Pro-
tected Object
The rated primary voltage (phase-to-phase) and rated primary current (phases) of the
protected equipment are entered in the address )XOO6FDOH9ROW and
)XOO6FDOH&XUU. These settings are required for indication of operational mea-
sured values in percent. If these rated values match the primary VT's and CT's, they
correspond to the settings in address and (Subsection 2.1.3.1).
General Line Data The settings of the line data in this case refers to the common data which is indepen-
dent of the actual distance protection grading.
The line angle (Address /LQH$QJOH) may be derived from the line parameters.
The following applies:
where R
L
is being the resistance and X
L
the reactance of the protected feeder. The line
parameters may either apply to the entire line length, or be per unit of line length as
the quotient is independent of length. Furthermore it makes no difference if the quo-
tients are calculated with primary or secondary values.
The line angle is of major importance e.g. for earth impedance matching according to
magnitude and angle or for compounding in overvoltage protection.
Calculation Example
:
110 kV overhead line 150 mm
2
with the following data:
R'
1
= 0.19 Ω/km
X'
1
= 0.42 Ω/km
No. Information Type of In-
formation
Comments
- Group A IntSP Group A
- Group B IntSP Group B
- Group C IntSP Group C
- Group D IntSP Group D
7 >Set Group Bit0 SP >Setting Group Select Bit 0
8 >Set Group Bit1 SP >Setting Group Select Bit 1
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