Siemens SIPROTEC 7SJ62 Manual page 59

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 de-
viation of 10% max. is admissible.
Recognition of Running Condition (Only for Motors)
When the configured current value at Address 1107 I MOTOR START is exceeded, this will be interpreted as
motor starting. This parameter is used by the start-up time monitoring and overload protection functions.
For this setting the following should be considered:
• A setting must be selected that is lower than the actual motor start-up current under all load and voltage
conditions.
• During motor start-up the thermal replica of the overload protection is "frozen", i.e. kept at a constant level.
This threshold should not be set unnecessarily low since it limits the operating range of the overload protec-
tion for high currents during operation.
Inversion of Measured Power Values / Metered Values
The directional values (power, power factor, work and related min., max., mean and setpoint values), calculated
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. The 4 section provides a detailed list of the
values in question.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Functions
2.1 General
59