Siemens SIPROTEC 7SD610, Руководство пользователя

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Functions
2.1 General
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
42
2.1.4 General Protection Data (Power System Data 2)
The general protection data ( P.System Data 2 ) include settings associated with all functions rather than a
specific protection, monitoring or control function. In contrast to the P.System Data 1 as discussed before,
these can be changed over with the setting groups and can be configured via the operator panel of the device.
To ensure uniform conversion factors of measured values for WEB-Monitor and control centres, the setting of
all operational rated values of the parameter groups under
P.System Data 2 should be identical.
2.1.4.1 Setting Notes
Rated values of protected lines
The information under this margin heading only apply if no power transformer is located within the protected
zone (device version without transformer option or address
143 TRANSFORMER
set to
NO
, Section 2.1.1.2).
With address
1103 FullScaleVolt.
you inform the device on the primary rated voltage (phase-to-phase) of
the equipment to be protected. This setting influences the displays of the operational measured values in %.
The primary rated current (address
1104 FullScaleCurr.
) is that of the protected object. For cables the
thermal continuous current-loading capacity can be used as a basis. For overhead lines the nominal current is
usually not defined. Here it is advisable to select the rated current of the current transformers (as in address
205 CT PRIMARY
, Section 2.1.2.1). If the current transformers have different rated currents at the ends of the
protected object, set the highest rated current value for all ends.
This setting will not only have an impact on the displays of the operational measured values in per cent, but
it
must also be exactly the same for each end of the protected object
since it is the basis for the current com-
parison at the ends.
General line data
The directional values (power, power factor, work and related min., max., mean and setpoint values), calculated
in the operational measured values, are usually defined with positive direction towards 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
). A different setting of the „forward“
direction for the protection functions and the positive direction for the power etc. is also possible, e.g., so that
the active power flow (from the line to the busbar) is indicated in the positive sense. At address
1107 P,Q sign
set the option
reversed
. If the setting is
not reversed
(default), the positive direction for the power etc.
corresponds to the „forward“ direction of the protection functions.
The reactance value X' as well as the capacitance value C' of the protected line are required for compounding
in overvoltage protection. Without these functions these parameters are of no consequence. The reactance
value X' of the protected line is entered in address
1111
as reference value
x'
in
Ω
/km if the distance unit was
set as kilometer or in
Ω
/mile if mile was selected as distance unit (address
236
, see Section 2.1.2.1 at „Distance
Unit“). The corresponding line length is entered in address
1113 Line Length
in kilometres or miles. If the
distance unit is changed in address
236
, the relevant line data of the changed distance unit must be reset in
address
1113
, address
1112
, and in address
1113
.
Capacity value C' of the line to be protected is entered in address
1112
as reference value
c'
in µF/km, if km
has been specified as length unit, or in µF/mile, if miles have been specified as length unit (address
236
, see
Section 2.1.2.1 under „Distance Unit“). If the distance unit is changed at address
236
, the relevant line data
have to be reset for the changed distance unit in address
1112
and in address
1113
.