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Auxililary relay for trip circuits

Jam
Hi all,


I have to rennovate an existing, relatively complex LV protection scheme, with multiple ACBs in some cases operating from the same trip signal (e.g. upstream intertrip) and in others operating separately (e.g. load shedding) and with coils operating at different voltages.


Can anyone recommend a family of auxiliary/interposing relays suitable for protection operations? An MVAA as might be used for HV schemes feels rather overkill (and won't fit) but not sure if I'd trust LV relays designed mainly for control due to the long periods of nothing happening followed by short periods of extreme excitement. I could (and will) Google it but would value comments from people here for reliability, availability and value.


Thanks,

Jam
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    Thanks OMS. Aren't those protection relays or do you mean 7PG11 and similar (which are similar to the MVAA)? The protection functions are already in place, though some are remote, it's just a matter of controlling which ACBs to trip under different fault conditions and keeping different control voltage sources separate.

    It might be easier to retrofit additional tripping mechanisms to the ACB (e.g. UV as well as shunt)... I was hoping there might be a DIN mounted device with say a single element and two CO outputs, just suficiently reliable for protection. Maybe it doesn't exist though!

    ....It'd be a lot easier to design from scratch, as then I could use the multiple output relays of the protection devices, but am limited by, for example, the number of existing cores.
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  • 0
    Thanks OMS. Aren't those protection relays or do you mean 7PG11 and similar (which are similar to the MVAA)? The protection functions are already in place, though some are remote, it's just a matter of controlling which ACBs to trip under different fault conditions and keeping different control voltage sources separate.

    It might be easier to retrofit additional tripping mechanisms to the ACB (e.g. UV as well as shunt)... I was hoping there might be a DIN mounted device with say a single element and two CO outputs, just suficiently reliable for protection. Maybe it doesn't exist though!

    ....It'd be a lot easier to design from scratch, as then I could use the multiple output relays of the protection devices, but am limited by, for example, the number of existing cores.
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