NETA Journal's

Inductive Heating and Qualified Low-Voltage Cable Terminators

04/01/2008
Most electricians, technicians and qualified facility personnel know medium-voltage cable terminations should be installed by a certified and experienced technician. Many do not realize the potential dangers that exist in low-voltage, high-current systems.

On-Line Fault Analysis of DC Motors

04/01/2008
Abstract—Over the last 20 years, current signature analysis (CSA) has become an established tool for online fault analysis of ac induction motors. Presently, very little research has been performed using current signature analysis on dc motors.

Preventing Condensation in Medium-Voltage Motors

04/01/2008
Condensation or other accumulation of moisture can be very damaging to the windings and mechanical parts of a motor, especially a medium-voltage motor. This is not usually a problem for a motor that is running, as the windings generate enough heat to prevent condensation.

What's Wrong with this Picture?

11/01/2007
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?

ATS07 to Begin Process of Becoming ANSI Standard

07/01/2007
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

07/01/2007
In part 1, the following four problem areas experienced by utilities that have tried dynamic relay testing were presented.

Testing for Corrosive Sulfur Effects

07/01/2007
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

07/01/2007
One of the key features of switchgear assemblies using drawout circuit breakers is the interchangeability of circuit breakers within an assembly.

Critical Maintenance for Circuit Breakers

07/01/2007
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

07/01/2007
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

07/01/2007
NETA's Board of Directors smiled for the camera in the midst of the activity at PowerTest 2007.

Circuit Breaker Lubrication in the Field

07/01/2007

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

07/01/2007
You walk up to a padmount transformer that was connected by others, and notice the following conditions.

Taking Lockout Too Far

07/01/2007
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

07/01/2007
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

07/01/2007
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

07/01/2007
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

07/01/2007
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).

Hidden Hazard in CT Shorting Blocks

04/01/2007
There was a hospital with a fairly new 15 kV main switchboard. Installed in their main switchboard was a basic power meter. You know the type - amperes, volts, kW, and PF.

Winter Answers - Manhole Mystery

04/01/2007
There is a worker in this manhole doing a cable splice. Based on what you can see, what's wrong with this picture?

Case Studies in On-Line and Off-Line Motor Analysis

04/01/2007
Current signature analysis (CSA) has become the standard for detecting broken rotor bars by analyzing the sidebands around line frequency.

The No-Outage Testing Matrix

04/01/2007
Although no-outage inspections can be very valuable tools, always remember to comply with proper safely guidelines when conducting
the energized "on-line" inspections.

Maintenance Catch 22: The Aging Workforce Meets the Skills Shortage

04/01/2007
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

04/01/2007
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

04/01/2007
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.