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Review of Power Quality Data in a Traditional Grid Environment Part 2

August 30, 2022
Figure 1: First service at a manufacturing facility. Secondary of Utility Transformer (PCC) in an area with heavy wind/solar/nuclear
Figure 2: Second service at same facility as Figure 1. Secondary (PCC).

What we typically find in facilities on grids that have heavier local and bulk grid wind/solar/nuclear can be found in Figures 1 and 2. Voltage unbalance is maintained at <2% (average is <1%) at the PCC. Over and under voltage is no more than 5% of 480 Volts with relatively small variations.

Incoming power is monitored with the same type of ECMS-1 and ECMS-E1 systems (Figure 3) shown in Part 1 of this short series which can be found: Review of Power Quality Data in a Traditional Grid Environment Part 1 – MotorDocAI. It can be noted that we typically find the variations at the PCC based upon a number of features including the type of power generation supplying the grid.

Figure 2: ECMS-E1 system mounted at meter/relay monitoring incoming power for the Figure 2 location above. This is on the same side of the transformer as the utility meter, which designates the PCC.

In Part 3 we will discuss why we see more stable voltage in grid systems that include wind/solar/storage.

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Last updated on August 30, 2022