Interconnection standards such as IEEE 1547 address protection and islanding. Which term describes preventing a distributed energy resource from continuing to energize a circuit during utility outages?

Interconnection standards such as IEEE 1547 address protection and islanding. Which term describes preventing a distributed energy resource from continuing to energize a circuit during utility outages?

• A. Islanding protection
• B. Voltage regulation
• C. Load shedding
• D. Phase balancing

Answer: (A)

Islanding protection is the mechanism that stops a distributed energy resource from energizing a circuit when the utility grid is down. Standards like IEEE 1547 require DERs to cease exporting power during a grid outage to prevent backfeeding a de-energized line, which protects line workers and equipment and helps keep the grid stable. Inverters implement this by monitoring grid conditions (voltage, frequency, etc.) and disconnecting when the grid is out of spec. The other terms don’t address this safety criterion: voltage regulation keeps voltage within limits, not the DER’s energization state during outages; load shedding reduces consumer loads, not the DER’s output; and phase balancing focuses on distributing load across phases rather than preventing islanding.

Islanding protection is the mechanism that stops a distributed energy resource from energizing a circuit when the utility grid is down. Standards like IEEE 1547 require DERs to cease exporting power during a grid outage to prevent backfeeding a de-energized line, which protects line workers and equipment and helps keep the grid stable. Inverters implement this by monitoring grid conditions (voltage, frequency, etc.) and disconnecting when the grid is out of spec. The other terms don’t address this safety criterion: voltage regulation keeps voltage within limits, not the DER’s energization state during outages; load shedding reduces consumer loads, not the DER’s output; and phase balancing focuses on distributing load across phases rather than preventing islanding.