NETA Journal's

Testing and Maintaining Low-Voltage, Bolted Pressure Switches

It seems to happen during every outage. You are brought in to maintain and test medium-voltage electrical distribution equipment. You are rolling along with your scope of work and get a call from the client to assist in resolving a problem with some low-voltage electrical distribution equipment.

ATS07 to Begin Process of Becoming ANSI Standard, Insulated Consuctor Committee News

NETA is announcing the initiation of the public review period for the NETA Acceptance Testing Specifications for Electrical Power Equipment and Systems as an ANSI Candidate Standard. During November 4–7, 2007, approximately 300 engineers and scientists met in Scottsdale, Arizona for the Fall IEEE/ICC meeting.

What You Need to Know About Grounding

Q We recently replaced a 13.8 KV, 2000 KVA transformer that was installed in the early 1950s. The earth ground conductors are embedded in a concrete slab. Construction personnel told me that they only test for earth ground on new substations and not on those over 50 years old.

What's Wrong with this Picture?

You are to filter the oil on a 13.2 kV primary transformer. After starting the work the following photo is taken of the high side section. What’s wrong with this picture?

Critical Maintenance for Circuit Breakers

Circuit breakers aren't much fun. They don't do a whole lot; just open contacts and close contacts. Pretty boring. However, if a breaker doesn't operate when it's supposed to, life can get very exciting!

World Class Maintenance

As maintenance departments have become major cost centers within industrial plant organizations, more management attention is being applied to reducing maintenance costs while maintaining operability and reliability.

News that’s NETA

NETA's Board of Directors smiled for the camera in the midst of the activity at PowerTest 2007.

Circuit Breaker Lubrication in the Field


There have been many circuit breaker failures attributed to lack of lubrication or improper lubrication. Many of these failures have lead to arc-flash incidents that have damaged equipment or injured personnel. 

What's Wrong With This Picture

You walk up to a padmount transformer that was connected by others, and notice the following conditions.

Taking Lockout Too Far

Until recently I didn't think you could take a lockout program too far. How wrong I was! On a recent trip to Indonesia I met an electrical engineer who told me a story about a medium-voltage equipment failure that occurred during a normal lockout procedure.

Tech Quiz #80 - Low Voltage Power Circuit Breakers

Low-voltage power circuit breakers are virtually everywhere. These devices are a critical part of the protective system but are often overlooked and much abused. Even though they are so critical, many equipment owners know almost nothing about them. How much do you know?

Corona Imaging — See the Invisible

It felt like a fine spring morning in eastern Oregon as my colleague and I rolled up the power plant driveway, although the date on my Blackberry indicated mid-February. After some friendly greetings and hand-shaking with maintenance personnel, we signed in at the control room and viewed the not too lengthy or boring safety video.

Step and Touch Potentials

For theoretical considerations, "true earth" can be viewed as a conductor deep in the ground, one with virtually no resistance. With this understanding,
ground resistance can be thought of as the resistance between, say, a ground mat or substation grid and true earth.

OSHA Releases New Subpart S

The Occupational Safety and Health Administration (OSHA) has released a new Subpart S (Part II) of the 29 CFR Part 1910, Electrical Standard General Industry Electrical Installation regulation as a Federal Register dated February 14, 2007. This document will become federal law effective August 13, 2007 (see Figure 1).

ATS07 to Begin Process of Becoming ANSI Standard

The need for acceptance testing of electrical power systems is very clear to those with extensive startup and/or operating experience. Shipping and installation damage, field and factory wiring errors, manufacturing defects, and systems and components not in accordance with drawings and specifications are some of the many problems that can be detected by appropriate testing.

New Techniques for Dynamic Relay Testing

In part 1, the following four problem areas experienced by utilities that have tried dynamic relay testing were presented.

Testing for Corrosive Sulfur Effects

Over the past several years there have been a number of failures of power transformers and reactors where there are indicators of copper corrosion and formation of copper sulfides on conductors and insulating materials.

Interchangeability of Drawout Circuit Breakers in Switchgear Assemblies

One of the key features of switchgear assemblies using drawout circuit breakers is the interchangeability of circuit breakers within an assembly.

Maintenance Catch 22: The Aging Workforce Meets the Skills Shortage

Maintenance and reliability careers, like many manufacturing positions, suffer from an "image" problem and fail to attract Generation Y workers. These and other factors are creating a rapidly expanding maintenance skills shortage.

Safety Grounding

Safety is the first and paramount consideration in virtually all electrical applications. Fortunately, properly certified consumer goods (to UL?, for
example) and building wiring (if in conformance to the National Electrical Code?) make safety concerns second nature in everyday contact.

Insulated Conductor Committee News

As liaison for the InterNational Electrical Testing Association, we are able to contribute a field-testing perspective to the working groups and groups reviewing the specifications as documents are reviewed and revised.

New Product Forum 2007

AEMC OX 7104 Series 2 and 4 Channel Oscilloscopes 

Methods of Inspection to Determine the Presence of Potential Arc-Flash Incidents

Arc flash can kill. Arc flash can be considered as a short circuit through the air. It produces tremendous energy that will travel outward from
electrical equipment.

Overcurrent Definitions

There are several terms that we use to name abnormal current in an electric power system. Although these terms are sometimes used interchangeably,
they really aren't interchangeable.

The Future of Predictive Technologies is Here Now

In today's competitive environment, it is imperative to capitalize on advances in technology that allow new approaches to the maintenance of a facility's physical assets. These include reliability-centered maintenance, predictive diagnostics, condition monitoring, and expert systems.