Setting Notes - Siemens SIPROTEC 7SD610 Manual

Note
The functions and default settings available depend on the device version ordered.

2.1.1.2 Setting Notes

Configuring the functional scope
The scope of functions with the available options is set in the Functional Scope dialog box to match plant re-
quirements.
Most settings are self-explanatory. The special cases are described below:
Special Cases
If use of the setting group changeover function is desired, address 103 Grp Chge OPTION should be set to
Enabled. In this case, up to four different groups of settings may be changed quickly and easily during device
operation (see also Section 2.1.3). With the setting Disabled only one parameter group is available.
Address 110 Trip mode is only valid for devices that can trip single-pole or three-pole. Set 1-/3pole to
enable also single-pole tripping, i.e. if you want to utilise single-pole or single-pole/three-pole automatic reclo-
sure. This requires that an internal automatic reclosure function exists or that an external reclosing device is
used. Furthermore, the circuit breaker must be capable of single-pole tripping.
Note
If you have changed address 110, save your changes first via OK and reopen the dialog box since the other
setting options depend on the selection in address 110.
The differential protection function DIFF.PROTECTION (address 112) as a main function of the device should
always be Enabled. This also implies the supplementary functions of the differential protection such as
breaker intertrip.
The Direct Local Trip (address 122 DTT Direct Trip) is a command that is initiated from an external device
for tripping the local circuit breaker.
At address 126 Back-Up O/C you can set the characteristic group which the time overcurrent protection uses
for operation. In addition to the definite-time overcurrent protection (definite time), an inverse-time overcurrent
protection can be configured that either operates according to an IEC characteristic (TOC IEC) or to an ANSI
characteristic (TOC ANSI). This selection is independent of whether the time overcurrent protection is intended
to operate as emergency protection (only in case of protection communication failure) or as independent
backup protection. In device variants with directional time overcurrent protection (MLFB position 14 = R or S),
you have an additional directional definite-time overcurrent stage and a directional current dependent inverse
time stage available. The characteristic curves for both inverse-time overcurrent stages are identical. The
various characteristics are shown in the Technical Data (Section 4.6). You can also disable the time overcurrent
protection (Disabled).
If the device features an automatic reclosing function, address 133 and 134 are of importance. Automatic re-
closure is only permitted for overhead lines. It must not be used in any other case. If the protected object con-
sists of a combination of overhead lines and other equipment (e.g. overhead line in unit with a transformer or
overhead line/cable), reclosure is only permissible if it can be ensured that it can only take place in the event
of a fault on the overhead line. If no automatic reclosing function is desired for the feeder at which 7SD610
operates, or if an external device is used for reclosure, set address 133 Auto Reclose to Disabled.
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
Functions
2.1 General
31