4.6 RELAY INTERFACE MODULES
The IRTU relay interface modules allow the number of auxiliary outputs for signalling and/or
alarm to be increased. There are different types of IRTU module according to the number of
relays. Figure 26 shows a front view of an IRTU module, for two and four relays.
Like those of the IPTU modules, the auxiliary relays of the IRTU modules are configurable
from the Management System for command transmission signalling, command output or
alarm and, if be the case, unblocking. In the case of alarm, the relay will act for one or more
of the following causes: RTC synchronization failure, Telemeasuring failure, IEC 61850 link
failure, Power-supply failure, Main module failure, Module failure in slot (no.), Manual blocking
(analog and digital), Automatic test failure (analog and digital), Incorrect SIC security
identification code (digital), Loss of synchronism (digital), Incorrect identification code (digital),
BER alarm (digital), Remote Alarm Indication (digital IOCT type), Loss of signal (digital IOCT
type), Reception blocking (analog), Error of reception (analog), Low Signal/Noise ratio
(analog), Signal loss (analog), Low guard-signal level/Excess guard-signal level (analog),
MTD alarm (IP interface), CDV alarm (IP interface), CLR alarm (IP interface), IP link failure (IP
interface).
Figure 26 IRTU relay interface module connector
The earth connection of the cable must be connected to the upper fixing screw. Make sure
that the module is completely fixed to the chassis.
To Next Page
Loading...
