Communication solutions for power utilities
UNIVERSAL TELEPROTECTION TPU-1
INSTALLATION AND COMMISSIONING MANUAL Web version TPU-1R - Rev. 5.9 (May 2018)
6 MAINTENANCE
The indicated operations should be carried out for teleprotection system maintenance.
However, the person in charge of maintenance should be the one to perform the operations
considered to be necessary in accordance with his own criteria.
The following verifications are suggested, which give a good indication of the state of the
equipment:
a) Checking the power supply.
Make sure, with the help of a multimeter, that the power-supply voltage in the
corresponding terminals (+ and –) is within the range specified for the operating
nominal voltage (48 V
dc
± 20%) and that the polarity is correct.
b) Checking the command input/output circuits.
Before carrying out a test of this type, the command transmission should
be suitably treated in order to make sure that no undesired output
activation take place in the remote terminal.
In the local terminal, check the command-input circuits of the IPTU modules. In
order to do this, with the aid of the Management System (Input activation option of
the Alignment menu), activate the command inputs of the IPTU modules and, by
means of the Commands Tx option of the Monitoring menu, check that the
EMISSION STATUS LEDs corresponding to the command in question lights.
In the collateral terminal, it could be checked that the command is received and if
the blocking option is not programmed from the Alignment menu of the
Management System, it may be verified that the command-output contacts
associated with the command are closed.
Then, repeat the verification process for the command-input circuits of the remote
terminal.
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