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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.
Terminal blocks placed at the rear cover are identified by black colour serigraphy on the cover. 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 terminals 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.
Other elements included in the module are the passive filters. As the magnetic module is an element connected to
external equipment signals, it is liable to suffer electromagnetic disturbance. In order to avoid this effect, there are
filters in the primary side of the transformer (capacitors connected to the case) and in the secondary side
(ferrites), that do not allow the perturbations enter into the relay. This protective elements have a double effect: act
like a barrier to the exterior and not allow the disturbance generated inside the relay to go out and affect any other
external equipment (emisivity and susceptibility).
The last elements that are included in the magnetic module are the output signals transformers adapters, that
consist of resistive attenuates.
This module is the main part of the equipment with reference to protection functions. The main functions are:
- Analog signals coming from magnetic module sampling.
- Protection algorithm evaluation.
- Protection logic and auxiliary functions.
- Monitoring functions, events register, oscillography register, etc.
- Equipment auto-checking.
- Protection data communication to the communications CPU.
CPU module nucleus is a 16 bits microprocessor together with its auxiliary associated electronic.
GEK – 106166B
29
6.1.4 IDENTIFICATION.
6.1.5 MAGNETIC MODULE.
6.1.6 PROTECTION CPU MODULE
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