2.4 Protection data interfaces and communication topology (optional)
119
7SA522 Manual
C53000-G1176-C155-3
The devices measure and monitor the transmission times. Deviations are corrected,
as long as they are within the permissible range. These permissible ranges are set at
address and and can generally be left at their default values.
The maximum permissible transmission time (address 35277'(/$<) is set
to a value that does not exceed the usual value of communication media. This setting
is only possible via DIGSI
®
at Additional Settings. If it is exceeded during operation
(e.g. because of switchover to a different way of transmission), the message ´3,7'
DODUPµ will be issued. Once a fault has been detected in the communication of the
protection data interface, the time at address 7G5HVHW5HPRWH is started for
resetting the remote signals. Please note that only the time of the device is considered
whose remote end has failed. Thus the same time is valid for all devices following in
a chain.
Protection Data
Interface 2
If protection data interface 3,17(5)$&( exists and is in use, the same options
are available as for the protection data interface 3,17(5)$&(. The correspond-
ing parameters are available at address 67$7(3527, (21 or 2))),
&211(&29(5 and 35277'(/$<. The last parameter can only be mod-
ified using DIGSI
®
at Additional Settings.
Communication
Topology
First of all, define your communication topology: number the devices consecutively.
This numbering is a serial device index
that serves for your own overview. It starts for
each distance protection system (i.e. for each protected object) with 1. For the dis-
tance protection system the device with index 1 is always the absolute-time master,
i.e. the absolute time management of all devices which belong together depends on
the absolute time management of this device. As a result the time information of all
devices is comparable at all times. The device index serves for unique definition of the
devices within the distance protection system (i.e. for one protected object).
An ID number is also to be given to each single device (device-ID
). The device–ID is
used by the communication system to identify each individual device. It must be
between 1 and 65534 and must be unique within the communication system. The ID
number identifies the devices in the communication system since the exchange of in-
formation between several distance protection systems (thus also for several protect-
ed objects) can be executed via the same communication system.
Please make sure that the possible communications links and the existing interfaces
are in accordance with each other. If not all devices are equipped with two protection
data interfaces, those with only one protection data interface must be located at the
ends of the communication chain. A ring topology is only possible if all devices in a
distance protection system are equipped with two protection data interfaces.
If you work with different physical interfaces and communications links, please make
sure that every protection data interface corresponds to the projected communication
link.
For a protected object with two ends (e.g. a line) the addresses ,'2)5(/$<
and ,'2)5(/$< are set, e.g. for device 1 the device-ID and for device
2 the device-ID (Figure 2-45). The indices of the devices and the device-IDs do not
have to match here, as mentioned above.
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