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https://www.dailymail.co.uk/news/article-9282215/United-Airlines-flight-makes-emergency-landing-dropping-debris.html Flight was able to land in Denver. No injuries reported. It was a Boeing 777.

Does anybody have a favorite app to recommend?

The last C++ compiler I used was a Borland product and the operating system was Windows XP. This was about 10 years ago and that computer finally died. I just got a Windows 8 pc and wondered what might be a good choice for a low cost compiler. Any suggestions would be appreciated.

Smart Grid has all the good touchy feely stuff that seems to be an emotional appeal with companies like IBM esposing their smarter planet visions. Maybe I'm alone on this, but I'd like to see where there is a good business case for justifying the huge expenditures in smart metere, advanced...

An earlier thread talked about selecting a high side for to protect a single transformer from inrush. It referred to 12 X normal at 0.1 seconds and 25 X normal at 0.01 seconds. I'm looking at a case where you have 5 identical kVA transformers (medium voltage) arranged in a daisy chain fashion...

Are there any guidelines as to where you would use a K, T or N link fuse? For example, does one type offer better protection for transformer protection?

The Entergy folks will have a lot to explain to the football fans tomorrow.

For 4-wire multigrounded distribution circuits, what types of faults on a distribution feeder can produce high voltages on the neutral? By high, I mean something more than 150 V. I'm just looking at what faults can possibly result in high voltages at a residence. I know open neutrals can...

As a distribution voltage, where service transformers were connected to it to serve customers, when did - 15 kV - 25 kV - 35 kV come about.

When you see the effects of Hurricane Sandy on the affected areas, you realize how fragile our infrastructure is and how much it relies on electricity. Think about what life is like after being out of power for a few days! No water. No gas for cars because the stations lost power. No...

We have a single phase circuit 7200 V to ground in a beach area. The circuit runs 2 or 3 miles and the peak load is around 100 A on the phase. The neutral is multi-grounded. In looking at the phase amps versus the neutral amps at different points along the circuit, I'm finding we're only...

A highway bridge over a river with a movable center section has power cables running vertically down the outside of a caisson. On each side of the cables there's a section of timber, approximately 12"x12" cross section and about 10 feet long. These are bolted to the caisson. Since I don't see...

I'm trying to get a better handle on some fundamental differences between European versus North American distribution practices, particularly for residential areas. I started with some info contained in the Std Handbook for Electrical Engineers and edited them based on my own experience. I've...

In considering lightning surges on overhead conductors, we frequently rely on the lossless line model in which the distributed nature of capacitance and inductance results in the characteristic or surge impedance, equal to the square root of (L/C). It is assumed that the line is infinitely long...

A company called Exacter developed some equipment that collects RF signals and GIS coordinates to determine if a utility has any medium voltage equipment that may fail prematurely. My question is pretty basic - does this technology actually work? For the utility folks out there, do you have...

Can someone describe the zero sequence impedance of an inverter? I've heard it described as a delta winding in a transformer, so it is just an open circuit. So if I have a generator or photovoltaic array behind it, it doesn't matter since the open circuit is there for the inverter. Can...

I saw an earlier post on this topic, but it involved 2 sets of conductors. This one involves 3 sets and comes from an application at one of our power stations. An installation is planned for a single circuit with 3 sets of 8 kV shielded cable on non-magnetic cable trays. How can we arrange...

I am dealing with some data that is skewed. The median is lower than the mean and the standard deviation is fairly high. The outliers have a significant influence on the mean and the standard deviation. When I do a natural log or ln transformation, it looks somewhat but not quite normal. I'm...

There's paper on the web that talks about failures of step-up transformers at wind generator installations. One culprit mentioned is harmonics. I didn't think there was enough harmonic distortion from wind generators. I know there's a dc to ac inversion required, but I didn't hear any...

What is the status of providing additional protection for high impedance faults? Is it widely used? I have seen papers on it over the years and just wondered if anyone is using it. Schweitzer has a relay based on harmonic signatures. Sounds like what Don Russell developed many years ago. We...