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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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    No worries. For context, the ACBs (Schneider Masterpact NW) are providing OC internally. Remote trips are coming from LV insulation monitioring (1 of 2, though both are equipped), a load shed command (1 of 2 ACBs), HV intertrip (both ACBs) and interlocking with one of the downstream MCCBs. Nothing particularly magic, but the IMD is required for ADS.


    I agree I wouldn't rely on the auxiliary for the protection directly but what I need is something to reliably duplicate signals coming from trips they have in common. Alternatively I could trip everything on anything, which is tempting but a little graceless, or rejig the arrangement further.
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  • 0
    No worries. For context, the ACBs (Schneider Masterpact NW) are providing OC internally. Remote trips are coming from LV insulation monitioring (1 of 2, though both are equipped), a load shed command (1 of 2 ACBs), HV intertrip (both ACBs) and interlocking with one of the downstream MCCBs. Nothing particularly magic, but the IMD is required for ADS.


    I agree I wouldn't rely on the auxiliary for the protection directly but what I need is something to reliably duplicate signals coming from trips they have in common. Alternatively I could trip everything on anything, which is tempting but a little graceless, or rejig the arrangement further.
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