Recently, we noticed irregular energy consumption spikes at our plant’s main substation without any corresponding load increase. After ruling out billing errors and meter faults, we shifted focus to relay coordination settings used for protection and load shedding. It turned out some relay thresholds were too sensitive, causing frequent, brief interruptions that reset equipment and increased inrush currents, leading to the energy surges observed.Have others seen subtle relay setting impacts on plant energy efficiency before? What’s your approach for surveying and validating protection settings without risking operational disruptions?
We ran into something similar during a substation upgrade, but in our case the spikes were tied to reclose logic rather than pure pickup sensitivity. A few relays were set with very short reset times, so downstream contactors were cycling more often than operators realized, especially during voltage dips. What helped us was reviewing event logs alongside energy data to see how often protection elements were actually operating, not just when trips occurred. We were cautious about changing settings and used staged tests during low-load windows to avoid process impact. Do you rely more on relay disturbance records or SCADA trends when validating settings? And have you seen certain protection functions cause more hidden energy impact than others?