Siemens siprotec 7SA522 - Page 33

2.1 General
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7SA522 Manual
C53000-G1176-C155-3
For changing configuration parameters in the device, password no.7 is required (for
parameter set). Without the password, the settings may be read, but may not be mod-
ified and transmitted to the device.
The functional scope with the available options is set in the Device Configuration
dialog box to match system requirements.
Special Cases Most settings are self-explanatory. The special cases are described below.
For communication of the protection signal each device may feature one or two pro-
tection data interfaces (depending on the ordered version). Determine at address 
whether to use protection data interface 3,17(5)$&( or  at address 3
,17(5)$&(. A protected object with two ends requires at least one protection data
interface for each relay. If there is more than one end, it must be ensured that all as-
sociated devices are connected directly or indirectly (via other devices). Subsection
2.4 “Communication Topology” provides more information.
If use of the setting group change function is desired, address  *US&KJH
237,21 should be set to (QDEOHG. In this case, up to four different groups of settings
may be changed quickly and easily during device operation (see also Subsection
2.1.4). Only one setting group may be selected and used if the setting is 'LVDEOHG.
Address  7ULSPRGH is only valid for devices that trip single-pole or three-pole.
Set SROH to enable also single-pole tripping i.e., if you want to utilize single-pole
or single-pole / multi-pole automatic reclosure. This requires an internal automatic re-
closing function to be available or an external reclosing device. Furthermore, the
circuit breaker must be capable of single pole tripping.
Note
If you have changed address , save your changes first via OK and reopen the
dialog box since the other setting options depend on the selection in Address .
Depending on the model of the distance protection, you can select the tripping char-
acteristic it should use at address  for the phase-to-phase measuring systems
3KDVH'LVWDQFH and at address  for the phase-to-earth measuring systems
(DUWK'LVWDQFH. You can select between the polygonal tripping characteristic
4XDGULODWHUDO and the MHO-circle characteristic 0+2. Subsection 2.2.3 and 2.2.2
provide a detailed overview of the characteristics and measuring methods. The two
addresses can be set separately and differently. If you want to use the relay only for
phase-to-earth loops, the function not required is set 'LVDEOHG. If the relay features
only one of the characteristics, the corresponding addresses are not visible.
To complement the distance protection by teleprotection schemes, you can select the
desired scheme at address  7HOHSURW'LVW. You can select the underreach
transfer trip with overreach zone 3877=%, the teleprotection scheme 3277, the
unblocking scheme 81%/2&.,1* and the blocking scheme %/2&.,1*. If the device
features a protection data interface for communication via digital transmission lines,
set 6,*1$/Y3URW,QW here. The procedures are described in detail in Section 2.2.1.
If you don’t want to use teleprotection in conjunction with distance protection set
'LVDEOHG.
The power swing supplement (see also Subsection 2.3) is activated by setting address
 3RZHU6ZLQJ = (QDEOHG.
With address  :HDN,QIHHG you can select a supplement to the teleprotection
schemes. Set (QDEOHG to apply the classic scheme for echo and weak infeed tripping.