NETA Journal's

NETA World Industry Topics – Testing Rotating Machinery Polarization/Depolarization Current (PDC)


The insulation resistance (IR) and polarization index (PI) tests [IEEE Std. 43-2000, ANSI/NETA ATS/MTS], should be done prior to application of any high voltage tests or return to service to assure that the winding is not wet or dirty enough to pose a risk of failure that might be averted by a cleaning and drying-out procedure.

NETA Setting the Standards – NETA Certified Technicians, Unique Qualifications


In the early 1970s, there were few standards for electrical testing. NFPA had authorized a committee in 1968 to create NFPA 70B, Recommended Practice for Electrical Equipment Maintenance. This standard addressed electrical equipment maintenance practices. It also touched on acceptance testing, advised on equipment, type of tests, and how often tests should be performed.

Apparatus Testing In Poor Weather Conditions


Apparatus testing in poor and/or extreme weather conditions presents several challenges - access to equipment, safety, and setting up the equipment under test so as to provide useful results. This paper looks at some individual case studies which demonstrate the precautions needed and the "Do's and Don'ts" of such testing.

Testing For Rural Electric Cooperatives

The Rural Electrification Act of 1936 provided federal loans for installation of electrical distribution systems to serve rural areas of the United States. The funding was channeled through cooperative electric power companies, most of which still exist today.

Tech Quiz #96 Switchgear & Circuit Breakers

Many companies don’t maintain their switchgear in the manner they should which can lead to problems and safety issues. We have seen instances where the protective relays have been calibrated, but the switchgear and circuit breakers have not been maintained. A lot of maintenance is driven by insurance company dictates, but that does not ensure a safe or efficient electrical system.

From the Brink of Disaster Lessons for Electrical Safety and Reliability

Engineering advancements throughout the 20th century enabled tremendous benefits to modern society and our way of life. Sometimes the evolution of technology advancements outpaced development of understanding and knowledge in how to apply new technology safely.

Survey Says! Maintenance Is Critical As Part Of Your Electrical Safety Program

When 10.5 percent of electrical equipment doesn’t operate, it is not hard to understand why it is widely touted that electrical maintenance of power distribution equipment is paramount to worker safety. This includes the correct operation of virtually any device such as relaying protection, fuses, and circuit breakers that are required to operate during a fault condition.

A Report on the January 2011 IEEE Electrical Safety Workshop

Many NETA-accredited companies (NAC) were represented at the recent IEEE IAS Electrical Safety Workshop (ESW) conference held on January 24-28, 2011, in Toronto, Ontario. This report is being provided to present observations of the NAC representatives at the workshop that you may use to improve electrical safety in your workplace.

Life Extensions AND Safety Upgrades for Aging Distribution Equipment


We just had an arc-flash incident. What can we do to protect our operators? The cost of keeping this gear on line is adding up. Is there a more cost effective approach than replacing the equipment?

Real World Learning At Your Fingertips

In 2012 NETA celebrates 40 years of service to the electrical systems industry - Establishing industry standards and delivering leading-edge technical information and educational resources based on real-world experience.

CSA Update


CSA M421 is the Canadian mining electrical installation standard and Jarret Solberg (NETA Level 4, Magna Electric Corporation, Regina) has been the representative throughout the latest revision cycle. The public review period is over, and the document will be released later this year.

Switchgear Life Extension: Replacement Of Electromechanical Overcurrent Realying

Electromechanical overcurrent relays such as the IAC and CO are the historical backbone of power system protection. These relays use delicate mechanisms and precision components to develop their operating characteristics and are subject to misoperation and failure resulting from contamination, corrosion, and simple aging.

NETA'S 2010 Outstanding Acheievement Award - Honoring NETA'S Most Valuable Asset

Each year NET A’s P resident is given the difficult task of selecting one of NET A’s many volunteers as the recipient of the Outstanding Achievement Award. This person demonstrates selflessness, drive, dedication, loyalty, and leads by example.

ANSI/NETA Standards Updates

In keeping with NETA’s branding initiative, the covers of all three ANSI/NETA Standards have undergone revision and all future editions will reflect the new cover designs.

Replacing Older Medium-Voltage Circuit Breakers With Vacuum Circuit Breakers


Many older installations of metal-clad switchgear are candidates for modernizing or upgrading. The interrupting duty may have grown past the interrupting capacity of the existing circuit breakers, maintenance costs may be getting out of hand, or circuit breaker parts may no longer be available.

The Current Method Of Testing Circuit Breakers

One of the most critical devices on any electricity network is the circuit breaker which can be described as the silent sentinel, standing guard over the network and only being called into action when a fault occurs.

Existing Substation Information Drive Equipment Life Extension Modernization, and Retrofitting

Much of the power system equipment in use today is nearing or has passed its predicted operating life, and we are pushing equipment to increasingly higher levels to meet demands. Injuries, failed equipment, unscheduled downtime, and loss of production are concerns that require knowledge of in-service power system apparatus. This is coupled with the competitiveness of the electrical energy market.

Overhead Lines: The Electrical Danger Above


Do you know what to do around overhead power lines? What if one falls to the ground? What if one falls across your car? Do you know what step potential is? Can you quickly and safely react to a downed power line event?

The goal of this article is to provide you with facts to better understand the hazards of overhead power lines…

Partial Discharge Measurement Pays Big Dividends


Just like people, electrical assets age and deteriorate; and as with human medicine, there have been tremendous advances in recent years in the ability to diagnose in the early stages ailments suffered by assets, enabling us to keep them healthy and productive longer.

Some Additional Methods For Resistivity Testing

Soil resistivity is the property that defines the ability of soil to conduct current and hence whether a given soil type can be expected to provide a good or a poor ground (high or low resistance). B y contrast, earth resistance defines the relationship of a grounding electrode to its immediate environment.

Look For A Way To Get Hurt


I challenge you to do this – go to work and look for a way to get hurt today. Really. Look for a way to hurt yourself. Don’t ignore anything. F ind a way that you could get injured and then write it down. Then look for another one.

Hazards Of Establishing An Electrically Safe Work Condition


When working around electrical equipment, the preferred working condition includes the equipment being put in an electrically safe work condition or turned off, locked out, and tagged out. This is stated in both OSHA and NFPA 70E requirements.

ARC Mitigation A Three-Step Approach


With any hazard there is a definable risk and a definable impact and it is no different for the arc-flash hazard. Quite often the impact in business interruption far outweighs the physical damage to equipment and industry statistics would suggest that the average physical equipment damage is around $50,000 and the business interruption cost around $85,000 per incident.

Specialzed Testing For Line Towers

Because the functions are narrowly defined, ground testing instrumentation exists in only a few fundamental designs. The basic tests performed are ground resistance, soil resistivity, and bonding, or the continuity of the grounding conductors connecting equipment to ground. Traditionally designed testers perform two or all three of these tests, depending on whether 3- or 4-terminal models.

Transmission Line Tower Foundation Condition Assessment


It was a cool, overcast morning in the Mid-Atlantic region of the US.