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In PQ News
Call of the Month for March 2025 Via the EPRI PQ Hotline, a PQ Knowledge funder inquired about recent catastrophic failures of a large AC motor drive at a high-profile recycling plant, causing fuses to blow and circuit boards to fail in the plant’s 1500 hp shredder drive (see photographs in Figure 1). In addition to the recycling center’s existing expenses from downtime and repairs, the situation is further complicated by the increasing difficulty in sourcing replacement parts. The facility ultimately plans to upgrade its low-voltage shredder drive to a medium-voltage drive for various reasons, including the lack of spare parts. While doing so, they are seeking any recommendations they should consider that will help to protect the new drive against the types of failures that they have experienced in the past.
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P1 Update
The P1 Update keeps members of Program 1 abreast of projects, supplemental projects, and other activities in the program, including a year-at-a-glance calendar.
EPRI Industrial PQ Training Videos
As a follow-up to our Industrial Power Quality training classes, we have posted these complementary training videos to help solidify the concepts for both utility members and their customers. The top three are listed here.
Visualizing PQ Drive Parameters for Improved Voltage Sag Ride-Through 
This video demonstrates the voltage sag susceptibility of AC drive systems and how to improve the drive’s robustness through parameter changes.
Understanding PLC Voltage Sag Ride-through: AC and DC Powered Systems
This video demonstrates the differences in voltage sag ride-through between an AC powered PLC system and a DC Powered PLC system.
Power Conditioning to Enhance Control System Voltage Sag Ride-Through: The Constant-Voltage Transformer
This video shows how a CVT can be utilized to harden the voltage sag response of an automated control system.