Underground Electrical feeder burn out

In the never ending saga of things I have not yet seen, we had a 350 kcml 3 phase underground feeder burn out yesterday at our AM transmitter site.

Actually, it happened the day before, around noon.  I received a call from the remote control that we were on the backup generator.  Upon arriving at the site, I found several trees down on the three phase primary down the street.  I figured that was the cause.  After checking the generator fuel supply, oil pressure, temperature, phase volts/amps, I decided that everything was okay and the power company would be along shortly to restore power.  I then continued up the road to our FM site to do weekly maintenance.

Upon returning to the office several hours later, I looked at the utility company website.  They have a pretty cool interactive map application that shows all outages and give restoration times.  The area around our transmitter site showed no outages, therefore I figured it had been cleared.

I committed two errors here:

  1. Not calling the utility company myself to ensure that the outage was reported.  I assumed that the tree across the three phase primary was the cause, it was not.
  2. Not calling the transmitter site remote control to check the generator status after I checked the website.

To be honest, I don’t know if I am coming or going these days.  With seven radio stations, each with it’s own transmitter site, three of them Directional AM stations, and three studio locations spread out over a 75 mile stretch, it is difficult to keep up with the small details.  Did I mention that I am solo, the engineering assistant position was cut two years ago.  But, I am not here to make excuses…

The net result is the generator ran all night long.  The next day, when I checked the transmitter in the morning, I was surprised to find the generator still running.  Unfortunately, I had an FM station on low power (see post below) that needed to be taken care of first.  When I finished replacing the RF module in the FM transmitter, I made my way to the AM site.

I called the power company then checked the generator fuel, the propane tank was down to 10%.  Yikes, better get this taken care of fast.  I will say the power company showed up pretty quickly.  After some measurements with a hand held meter, it was determined that the under ground feeder was open between the pole and the transmitter building.

The line man was not at all surprized, in fact, he called it before he even went up in the bucket truck.  After some back and forth with his supervisor, who came out in a pick up truck, it was decided that they would run a temporary overhead feed to the meter can.

temporary overhead electrical feeder
temporary overhead electrical feeder

They also did some research in there records and discovered that they (the utility company) own the underground cable and therefore they would dig it up and fix it.  That’s nice because otherwise it seems like it would be an expensive repair job.  On a station that makes not a lot of money.

A trip to the FM transmitter site

A few pictures from my last trip to one of our FM transmitter sites.  This is a mountain top site, in as much as a medium sized hill is a mountain around here.  This site has a 2.3 mile road through the woods that is almost impassable 3-4 months out of the year.

Previous engineers have walked up the hill with a tool box.  I can say this with all honesty; not me.  In the past they have also rented a helicopter, used a snow cat, snowmobiles or an ATV with snow tracks.  I’d do those things provided they are safe and insured.  As I get older (and wiser), I realize that the only person who going to look after my well being is me.

Anyway, the trip starts here, at the gate:

Gate to transmitter road
Gate to transmitter road

Then it goes up the hill:

Transmitter site access road
Transmitter site access road

Some sections are worse than others:

washed out road
washed out road

Along the way there are some nice views:

City reservior near transmitter site
City reservior near transmitter site

Finally, the gate to the tower farm:

Access gate to transmitter site
Access gate to transmitter site

There are two digital TV stations, several cell phone carriers, some government two way gear, some FM translators, Media Flow, and us at this site.  There are also some Ham radio repeaters off to the side in another building.  All in all, a pretty RF intense site.

The view from the top:

view looking north
view looking north

The reason why we came:

Transmitter room
Transmitter room

That is a 24 year old BE FM5B transmitter.  The back up is a Gates FM5G, which aren’t we glad we have a solid reliable transmitter selection for such a remote site.  Actually, we were supposed to put in a new Nautel V-10 here last year, but the money was spent on computers instead.  Oh well, good thing there will be no computer crashes when we go off the air.

A standard maintenance trip consists of meter readings, comparing the reading to the last set of readings, changing the air filters, checking the remote control and calibrating it to the transmitter, checking the tower light sensor, etc.

Normally, the backup transmitter would be run into the dummy load, but the backup transmitter no longer works.  Parts are not available to fix it, so we operate without a net.  One of the previous general managers asked if that keeps me awake at night, to which my answer was no, not at all.

Tower down

You know it is going to be a bad day when:

a farmer mowing grass took a wrong turn on June 16, KFEQ AM lost a guy wire and eventually one of its four towers came toppling down

From Above Ground Level magazine.

Is hiring the farmer down the road to come and mow the AM field a smart thing to do?  It depends, I suppose, on whether or not your towers will be standing afterward.  Hopefully the guy had some insurance, if not then the station is basically screwed.  The article did not mention that, although it did state that “The station is wieghing it’s options,” Which does not sound good.

The good news is at least they were doing the maintenance.  Most AM stations these days don’t even bother to mow the fields.  Look at this picture:

Tall grass at an AM transmitter site.  Owner says don't cut it.
Tall grass at an AM transmitter site. Owner says don't cut it.

It is not that I don’t want the grass cut, I do.  However, I am not going to pay for it out of my own pocket, that is ridiculous.  So, it grows.