Power System Data 2; Description; Setting Notes - Siemens siprotec SJ62 User Manual

2.1.6

Power System Data 2

2.1.6.1

Description

Applications
2.1.6.2

Setting Notes

Definition of
Nominal Rated
Values
Ground Impedance
Ratios (only for
Fault Location)
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The general protection data (P.System Data 2) includes settings associated with
all functions rather than a specific protection or monitoring function. In contrast to the
P.System Data 1 as discussed before, they can be changed over with the setting
groups.
If the primary reference voltage and the primary reference current of the protected
object are set, the device is able to calculate and output the percentage operational
measured values.
For protection of motors the motor starting detection represents an important feature.
Exceeding a configured current value serves as a criterion.
At addresses 1101 FullScaleVolt. and 1102 FullScaleCurr., the primary ref-
erence voltage (phase-to-phase) and reference current (phase) of the protected
equipment is entered (e.g. motors). If these reference values match the primary VT
and CT rating, they correspond to the settings in address 202and 204 (Subsection
2.1.3.2). They are generally used to show values referenced to full scale.
The ground impedance ratio is only relevant for line fault location. At address 1103,
resistance ratio RG/RL Ratio is entered, and at address 1104, the reactance ratio
XG/XL Ratio is entered. They are calculated separately, and do not correspond to
the real and imaginary components of Z
necessary! The ratios are obtained from system data using the following formula:
Where
R
0
X
0
R
1
X
1
These values may either apply to the entire line length or be based on a per unit of line
length, as the quotients are independent of length.
/Z . Therefore, no complex calculations are
0 1
– Zero sequence resistance of the line
– Zero sequence reactance of the line
– Positive sequence resistance of the line
– Positive sequence reactance of the line
2.1 General
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