GE Multilin DTP-B, Инструкция по эксплуатации

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8. HARDWARE DESCRIPTION
GEK-106243E DTP Digital Transformer Protection 8-3
5. Take out the internal bus board that holds the different modules.
Following this process, every relay module can be accessed for taking it out, maintenance or replacements. In
order to assemble the relay again, the opposite procedure should be followed, that is:
1. Make sure that every vertical drawout module has been correctly inserted.
2. Place the internal bus board, which holds the different modules, by pressing from left to right every connector
in order to ensure their right insertion.
3. Connect the flat cable that joins the front module with the communications port.
4. Place the front module in its position and screw it.
5. Cover again the relay with its protective cover.
8.1.4 IDENTIFICATION
The identification label of the unit is placed on the right of the alpha-numeric keypad. This label includes the model
number, serial number and the most relevant rated values (including rated current, and DC power supply rated
voltage).
Terminal blocks placed on the rear cover are identified by black colour serigraphy on the cover. Each of the
terminal blocks is labelled by a letter placed on the top border of the cover, close to the connector. This connector
identification is assigned to the different connectors, beginning by A, which corresponds to the connector placed
on the right end (looking at the relay from the back).
In the terminal blocks, each of the 12 terminals of each block is labelled from the top to the bottom by a number
from 1 to 12, serigraphied on the cover close to each connector, where the connection cables are plugged. The
connector terminals for synchronization are labelled with IRIG-B, and their polarity is labelled with “+” and “-“.
For relays with fiber optics communications (plastic or glass), the connector’s transmission and reception
terminals are labelled TX and RX respectively.
8.1.5 MAGNETIC MODULE
The magnetic module takes the current inputs from the conventional substation transformers, and performs the
following functions:
•
It provides galvanic isolation to the external signals by means of internal transformers of the unit.
•
It gives the external inputs the adequate voltage levels for the internal circuitry.
Passive filters are another element included in this module. As the magnetic module is connected to external
equipment signals, it is liable to suffer electromagnetic disturbance. In order to avoid this effect, anti-noise filters
have been included in the primary side of the transformer (capacitors connected to chassis), as well as in the
secondary (ferrites), so as to prevent disturbance from entering the equipment. These protection elements act as
well as a barrier, preventing possible disturbances generated in the protection equipment from coming out of it
and affecting the external equipment (emisivity and susceptibility).
The last element included in the magnetic module consists of load resistors that convert the current signals in
voltage signals, in case of current inputs; and the voltage signals in resistive attenuates.