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Regulators press utilities on monitoring gaps after Broad Brook relay and data limitations
Summary
Authority staff and parties identified gaps: event-triggered relays with finite memory, production meters with coarse granularity, and the site’s lack of the new DER gateway standard — and discussed short-term POI monitoring and a one-month power-quality study to detect harmonics or transients.
Authority staff sought detailed answers on how commissioning tests, relays and meters record power-quality data and whether that data would have captured pre-event conditions before the March and July incidents.
Eversource engineers explained that protective relays and reclosers operate and generate alarms only when specific thresholds are met; relay waveform captures are event-triggered and limited by available memory. Next ERA said their production meter records power, reactive power and power factor continuously but at a much coarser…
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