IEEE Standard 1547 [1] was an attempt at a National Standard
for DG interconnection. In this author’s view, IEEE 1547 provides
very limited guidance to the industry on interconnect protection
requirements other than calling for over/underfrequency and
over/undervoltage interconnection protection. However, IEEE
1547.2[2] provides more comprehensive interconnection guidance.
Both standards clearly defines interconnection protection be
installed at the Point of Common Coupling (PCC) between the DG
and the utility system. Key issues such as: potential overvoltages,
interconnection transformer choices, loss-of-utility-relay
coordination, damage to DG generators due to unbalanced current
caused by utility single-phasing, and out-of-step protection are not
addressed to any significant level. While 1547.2 address the above
IEEE Standard 1547 [1] was an attempt at a National Standard
for DG interconnection. In this author’s view, IEEE 1547 provides
very limited guidance to the industry on interconnect protection
requirements other than calling for over/underfrequency and
over/undervoltage interconnection protection. However, IEEE
1547.2[2] provides more comprehensive interconnection guidance.
Both standards clearly defines interconnection protection be
installed at the Point of Common Coupling (PCC) between the DG
and the utility system. Key issues such as: potential overvoltages,
interconnection transformer choices, loss-of-utility-relay
coordination, damage to DG generators due to unbalanced current
caused by utility single-phasing, and out-of-step protection are not
addressed to any significant level. While 1547.2 address the above
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