Condition Monitoring: Generator Stator Ground Capacitance

Steve Turner, Arizona Public Service Company Columns, Relay Column, Winter 2022 Columns

This article demonstrates how to use numerical generator protection relay profile capability to measure the stator ground capacitance of a large combustion turbine generator. The measurements are taken when the generator is on-line and running at full speed while the generator breaker is open (no load), and again during startup as the exported power increases. The stator capacitance-to-ground (Figure 1) …

NFPA 70E, 2024 Edition: Second Draft Meeting

Ron Widup, Shermco Industries Columns, NFPA 70E and NETA, Winter 2022 Columns

In late August 2022, the NFPA 70E Technical Committee met for the Second Draft meeting related to the revision of what will be the 2024 edition of NFPA 70E, Standard for Electrical Safety in the Workplace. This was the step in the revision process where the 70E Technical Committee meets to review Public Comments as well as NFPA Correlating Committee …

Recognizing Your Dedication

Eric Beckman, National Field Services, NETA President President's Desk, Columns, Winter 2022 Columns

As so many parts of the world face challenges due to extreme weather and geological events, I want to take a moment to recognize electrical workers and their families. As we all have learned, the electrical infrastructure is quite possibly the most essential part of our life these days. We tend to forget that we can’t accomplish many of the …

Ground Enhancements: An Answer to Difficult Grounding Situations

Jeffrey R. Jowett, Megger Columns, Tech Tips, Winter 2022 Columns

As part of the electrification of a facility, it is commonly thought that merely connecting the system to a driven ground rod means that the building is grounded. It’s not that simple. By pure luck, such an approach may indeed work. But the considerable value of the building, the efficiency of operation, the wealth of information and knowledge that is …

Off-Line Partial Discharge Cable Testing

Virginia Balitski, Magna IV Engineering Columns, Tech Quiz, Winter 2022 Columns

NETA Certified Technicians must continually adjust to advancing technology and diagnostic testing techniques. Over the years, cable testing has advanced to where multiple testing methods can be selected. After careful consideration of system requirements, a site owner may choose off-line partial discharge (PD) testing as one of their cable testing methods. This quiz looks at some details on partial discharge …

Programs, Policies, Manuals, Procedures, and Training

Paul Chamberlain, American Electrical Testing Co., LLC Columns, Safety Corner, Winter 2022 Columns

Several regulatory agencies direct which documents are required when performing a company’s tasks. In some cases, federal and state requirements must be adhered to for the same task or hazard. For example, in the United States, the U.S. Environmental Protection Agency (US EPA) and state environmental agencies such as the Massachusetts Department of Environmental Protection (MA DEP) regulate potential environmental …

Medium-Voltage Cable Installation Issues

Mose Ramieh, CBS Field Services Columns, In the Field, Winter 2022 Columns

Properly installed and maintained medium-voltage cable is highly reliable, and when properly installed, there is little or no maintenance to be performed. Yes, you should keep the terminations clean, and yes, you can perform a periodic VLF with tan delta or partial discharge test to trend degradation over the years. However, in my experience, the No. 1 reason cables fail …

The Impact of Electric Vehicles on the Electrical Testing Industry

Eric Beckman, National Field Services, NETA President Columns, Fall 2022 Columns, President's Desk

Hopefully, everyone had a safe and enjoyable summer. I know I’m looking forward to cooler temperatures as it’s been a very hot summer across the South. As the world starts to adapt and the production and use of electric vehicles increases, the impact on the electrical infrastructure is drastic. Charging stations, load demand, and power-grid impact and maintenance requirements are …

Ungrounded Systems

Jeffrey R. Jowett, Megger Columns, Fall 2022 Columns, Tech Tips

“What’s in a name?” asked Shakespeare. The quote is so widely known because it’s so widely applicable. In the electrical industry, the terms “grounded” and “ungrounded” are commonly applied to electrical systems. They are often taken for granted or misunderstood. How can a grounding electrode be present, and yet the system is termed “ungrounded?” It is beneficial and productive to …

Electric Vehicle Charging Stations

Virginia Balitski, Magna IV Engineering Columns, Fall 2022 Columns, Tech Quiz

Electric vehicles (EVs) are becoming much more common for commercial and personal use. The electrical testing industry has started to see an impact regarding EVs and EV charging stations. This quiz will go over some EV charging station information that may be relevant to NETA Technicians. What battery type is primarily used for EVs? a. Lithium-ion b. Lead-acid c. Alkaline …