Grid Monitoring Relays and DT Standard: Protection for Distributed Generation

As the integration of renewable energy sources into the grid accelerates, grid protection standards become increasingly critical. Especially in DG (distributed generation) systems, anti-islanding protection is mandatory for both grid safety and the safety of field personnel.

What is Islanding?

Islanding is defined as a distributed generation source (e.g., a solar energy system) continuing to generate without disconnecting from the grid during a grid fault or planned outage. This can lead to dangerous consequences such as:

• ▸Risk of maintenance crews working under unexpected voltage
• ▸Equipment damage (phase mismatch during reclosing)
• ▸Malfunction of grid management systems

Standard Requirements

In Turkey, TEDAŞ/ENH and ENTSO-E require Under/Over Voltage and Under/Over Frequency thresholds, as well as ROCOF (Rate of Change of Frequency) and vector shift protections for grid-connected generation systems.

Caselen FCR Series

FCR-101 and FCR-001 grid monitoring relays continuously monitor over/under voltage, over/under frequency, ROCOF, and vector shift parameters. Adjustable thresholds and delays allow configuration according to each facility's grid connection agreement. A built-in communication interface also provides remote monitoring and recording capabilities.