Magnetic Module - GE DTR GEK-106305A Instruction Manual

5. Take out the internal bus board which fixes the different modules themselves.
If this process is followed, every relay module can be accessed in order to be taken out, maintained or replaced. In
order to assembly the relay again, the procedure is the contrary, that is to say:
1. Make sure that every vertical drawout module has been correctly inserted.
2. Assembly the internal bus board which joins the different modules themselves by pressing from left to right every
connector in order to be sure of their right insertion.
3. Connect the flat cable that connects the frontal module with the communications board.
4. Place the frontal module at its position and screw it on the box.
5. Cover again the relay with its protective cover.
The identification label of the model is placed at the right of the alpha-numeric keypad. This label includes the model
number, serial number and the most important nominal values (including nominal voltage and current, and DC power
supply nominal voltage).
Terminal blocks placed at the rear cover are identified by black color serigraphy on the cover (see figure 5.2.). Each
of the terminals blocks are identified by a letter placed at the upper 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 extreme (looking at the relay from the back).
In the terminal blocks, each of the 12 terminals of each block is identified from the top to the bottom by a number
between 1 and 12 that is serigraphied on the cover close to each connector at the input side of the connection
cables. The connector terminals for synchronization are identified by "IRIG-B" serigraphy and the terminals polarity is
indicated by "+" and "-".
For relays with fiber optics communications (plastic or crystal), transmission and reception connectors terminals are
identified by TX and RX serigraphy respectively.
Magnetic module takes voltage signals of the substation conventional transformers, and with these signals performs
the following:
- It gives galvanic isolation to external signals by means of relay internal transformers.
- It makes suitable the external signals to the adequate voltage levels for the internal circuitry.
Anti-noise filters are another element of the module. As the magnetic module is connected to external switchgear
signals, it can be affected by electromagnetic disturbance. In order to avoid their effect, anti-noise filters have been
included in the transformers' primary (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 to come out of this and affect the external equipment.
The last element included in the magnetic module consists of load resistors that convert the current signals in
voltages, in the current signals case, and of resistive attenuators in the voltage signals case.
GEK-106305A
6. HARDWARE DESCRIPTION
DTR Digital Tap Changer Controller
6.1.4 IDENTIFICATION

6.1.5 MAGNETIC MODULE.

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