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Each of the DTR output boards includes 12 heavy duty relays, 16 Amperes nominal continuous capacity and 4000
VA breaking capacity or signaling, of continuos nominal capacity of 8 Amp. Each of these relays has an only contact
(NO). The contact of each relay can be set separately as normally close or normally open by jumpers (fixed by
welding) placed on 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.
The Power Supply module includes the following functions:
• Generation of the necessary voltages for the operation of the DMS modules circuitry, in this case 8V
(subsequently regular to 5 V) for the logic, and 24 V for the tripping activation.
• Four relays, with the same characteristics as the ones included in the outputs board (2 relays for tripping functions
and 2 relays for reclosing).
• An auxiliary relay for equipment alarm.
As regards the power supply board we should emphasize that:
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One passive filter is included in the power supply input in order to avoid any possible electromagnetic
disturbances. A current limiter is also included in order to protect the power supply against unintentional
groundings.
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The tripping relays are stronger (in capacity and in control operations life) than the normal ones used for
similar protection equipment. Besides this, as the output contacts type can be configured, a high versatility
is provided.
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The output circuits for feeding other boards are conditioned so that they can have several boards
connected, being possible to switch the service from one board to another one in case of failure, increasing
the reliability of the equipment.
GEK-106305A
6. HARDWARE DESCRIPTION
DTR Digital Tap Changer Controller
6.1.9 DIGITAL OUTPUTS BOARD
6.1.10 POWER SUPPLY
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