I have a question about the ANSI 25 Sync check relay and reconnecting to the distribution systems. Specifically I have a question regarding this operation for converter based generators that utilize wye grounded (primary) / wye ungrounded (secondary) transformers, but this would apply to any generator type.
Does the sync check system need access to a ground reference inside a solar/BESS facility, for instance, to help it reconnect back to the utility?
In the solar facilities I am aware of, the facility transformer is wye grounded (primary) / wye ungrounded (secondary), therefore not a source of zero-sequence currents. The reasoning is to protect the distribution system from any added sources of ground fault current, but does this cause an issue with restoring a generator to the system after a fault condition?
In looking at the specs for a sync check device, it appears they are looking at a per phase ΔV or a frequency match percentage, but am I missing something glaringly obvious?
Thanks for any help.
Does the sync check system need access to a ground reference inside a solar/BESS facility, for instance, to help it reconnect back to the utility?
In the solar facilities I am aware of, the facility transformer is wye grounded (primary) / wye ungrounded (secondary), therefore not a source of zero-sequence currents. The reasoning is to protect the distribution system from any added sources of ground fault current, but does this cause an issue with restoring a generator to the system after a fault condition?
In looking at the specs for a sync check device, it appears they are looking at a per phase ΔV or a frequency match percentage, but am I missing something glaringly obvious?
Thanks for any help.
