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Communications CPU module nucleus is very similar to the protection CPU module, and it also consists of a 16
bits microprocessor together with the auxiliary electronic.
The main function of the communications CPU module is to maintain and control the communications in the
following channels:
- Internal communication with the protection and control CPU modules.
- Local mode communication with a PC by the front communications port.
- Remote mode communication by rear communication port.
- Man-machine interface by means of keypads and displays.
The design of the DFF has been done taking the maximum care in assuring reliability against electromagnetic
disturbance.
Each of the board inputs has a resistive attenuate which adequates the external voltage battery levels (48 V, 125
V, ...) to the needs of the optocoupler that gives galvanic isolation to each input. As the majority of these inputs
come from elements that are connected to the substation equipment, together with the resistive attenuate one
passive filter is provided in order to get better behaviour against electromagnetic perturbations.
Inputs modules (as well as the output ones) provide one selectable 4 bits address which allows to include several
modules in the same equipment.
Each of the DFF output boards contents 12 heavy duty relays, 16 Amperes nominal continuous capacity and 4000
VA breaking capacity. Each of these relays has one contact (NC + NO). The contact of each relay can be set
separately as normally close or normally open by jumpers (fixed by welding) placed in the board.
In every configuration the contacts are non potential contacts, without common elements and all of them have
varistors between their terminals in order to protect them against overvoltages generated by the coils they are
connected to. This provides a high immunity against electrical interferences.
Power supply module includes the following functions:
Generation, from the external battery power supply, of the necessary voltages for electronic circuitry.
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In this case: 8V (later they are regulated to 5V) for logic, and 24V for the trips.
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Four tripping relays, with the same characteristics that the ones included in the outputs board, and
assigned to trip functions in the DFF equipment.
One equipment alarm auxiliary relay.
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With reference to the power supply module it is important to point out:
One passive filter is included in the power supply input in order to avoid any possible electromagnetic
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disturbances. A current limiter is also included in order to protect the power supply against unintentional
groundings.
The tripping relays are stronger (in capacity and in control operations life) than the normal ones used for
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similar protection equipment. Besides this, as the output contacts type can be configured, a high versatility is
provided.
GEK – 106166B
6.1.7 COMMUNICATIONS CPU MODULE.
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6.1.8 INPUTS MODULE.
6.1.9 OUTPUTS MODULE.
6.1.10 POWER SUPPLY.
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