HV diodes to service the rectifier board are not available. Substitution of the entire board is the practical remedy. My question is: What is output of this UHF transmitter..?
Given that phase B was low, I would say an open diode. As a short would have caused a fault trip. The noise is from eddy current loss (inductive coupling) in the delta transformer imbalance.
At Woofferton we have a large number of high voltage oil filled components. These days we are not allowed to expose our skin to oil. We have to wear full glove protection. It makes the job more difficult but it is much kinder to our health. I fèel for the engineers in this video. Great fault finding technique.
The oil isn't very good for you healt as it may cause cancer. And you get water in the oil with your skin and you may need to change it after some maintance which is expensive.
(0:46) - "Thirty six thousand kilovolts" = thirty six thousand thousand volts. That's 36,000,000 volts or 36 million volts. *_SURELY THAT AIN'T RIGHT?_* .
Just removed 2 of the same Beam supply's. One of our engineers came up with a great idea for pumping the oil out. We had been using a regular water pump. but the pump was beating the, thinner than water, oil to a foam and taking much too long . He bought a "el chepo" drill pump.. That on a heavy duty drill worked wonderful . Sad to see the good ole Sigma go. Well maybe not that sad..
Use one of those inline fuel pumps that have two hose barbs and runs on 12v. They are typically rated for pumping diesel which is just a thin type of oil.
@@DEVONLAD11 I have touched 30KV Capacitor by mistake before and i would compare it to getting smashed by Hulk, it's true high voltage low AMPS are less likely to kill you, but remember the effect of 30KV shock is enough to catapult you with possibility of cracking your head, etc. Certain safety procedures needs to be followed at such a workplace. Personally I would wear gloves just to be safe
Also this insulating fluid could have been Askeral or Inerteen (PCB) which is not kind to the skin. What kind of fluid was it? Mineral oil would not be used here since the transformer is in a closed building. I suspect it is not PCB for all such transformers were retrofitted years ago or disposed of. Regardless the tech should have worn long gloves.
Yeah the oil needs to be dry and clean. At 55kv it isnt as critical because the parts are bigger and physically isolated, but with X ray stuff you need it dry and vacuumed. I have worked on similar units filled with SF6 gas that output 60 to 260kV at a few AMPS that actually use a high frequency transformer and scary capacitors inside. When these go there isnt a hum, there is a bang...
Taking a chance removing the rectifier board under oil. Great risk dropping the mounting hardware. I did find the troubleshooting technique to be sound however need to employ HV gloves whenever applying shorts and grounds. Lockout, tag out, use of PPE, should be practiced along with human performance methods. Tailboard briefs detail all of the hazards prior to work. Again troubleshooting technique was sound and reasonable safe provided proper use of PPE applied. Thanks for sharing.
A faulty rectifiers in the 55kW analog transmitters I worked on was easy to spot...Hum bars in the video from the sagging voltage when a phase was missing.
As stated below, I saw several procedural errors. Improper PPE, Improper grounding equipment, improper procedure. This is not a safety procedure video. One does NOT just get bit by 35kv !
Even if that oil is PCB free mineral oil it is a bad idea to stick your unprotected arms into it. First he cleans the lid nit to contaminate the oil, then he works with his bare hairy arms submerged. Also the shorting/securing of the capacitors is done in an unsafe way.
I was thinking about that too. When manufacturing transformers, they take special care to have dust free environments to ensure contamination doesn't occur, it can't possibly be good to have skin cells, hair and general grime that accumulates on the skin contaminating the oil.
What is the significance of the Morse code at the start? And what is the third character? It isn't international Morse code! BC(dit dit dah dah)TA0WN???
Anyone else notice the random lady just appear out of nowhere. Probably walking down the street and like what's going on in there then ohhhh it looks like he need help.
Lower amp draw on one phase with loud hum means one diode stack is open and maybe arcing inside on the less current drawing phase. It was assumed but swapping is a bit quicker than diagnosing and fixing, also IME when one diode goes the rest are not far behind, replace as a set like spark plugs and wires.
It is not strictly necessary to have a neutral in a three phase system. When this is the case, for example if the three phase power is generated by transformer windings in a delta configuration, the circuit is usually grounded via a grounding transformer. In that case you measure each phase with respect to ground because indeed, the only thing the 'neutral' is connected to is ground.
Safety is not a management priority until someone gets injured or killed. Most stations will provide no help to the transmitter guy and PPE is just a waste to them. The management has usually never been to the transmitter and would not know how to find it. Hint: It is nowhere near the golf course. They will, however, keep calling the transmitter to see when we will be back on the air. Even in a station like the one pictured (A-B parallel operation), They seem to think: A. We are still on, I see a picture, B. 50% power! We are losing half of our viewers! c. Will this be expensive? D. No overtime, period. OH, It is not PCB oil... It is some sort of mineral oil. Not to worry.
36000 kilovolts? You sure you are an engineer or just an online one haha I'm kidding honest mistake certainly. I never knew their were inductive tunes for radio frequency that is awesome 👌
@@darhat3911 Yes, but he didn't say: "31 kilovolts" which would be 31,000 volts. He said "31 *_thousand_* kilovolts" which is three orders of magnitude higher, or 36 million volts.
The on line engineer my hobbys are painting pictures and lisining to shortwave and ssb iam thinking about getting my ham license I have 4 shortwave receivers
36,000 Kilovolts ? That would be 36 Million volts. Further on they show using a standard volt-ohmeter to read three phase voltates. Can't be done ! Must use a three phase voltmeter.
When he was wearing gloves I thought, if he isn't careful the oil is going to go over the end and soak his hand, then he just takes them off so I'm like, OK, nevermind. Wouldn't it just make everything you touch kind of oily?
@@richardemms3050 Thats what I was thinking, but it appears he was actually wearing the gloves in case any of the submerged capacitors were holding a charge. Once he was sure they were discharged, he took the gloves off. I guess getting zapped under oil hurts as much as getting zapped in air.
BOY .... Brown, orange, yellow. Indicates on visual hi voltage. Grey can be the neutral. Out of balance happens on 120/240 VAC, single phase in homes also. Amprobe test first 2 poles ... should be same. Then test SP breakers on each phase n note amps by circuit number. A= B amp draw is balanced. Swapping due to each owners bldg use will be different. So u swap wire, not breakers, until A does equal B. U can save consumer between 10 to 15% on bill. Measured n proven. While ur at it .... set up a breaker control index/legend of circuit control. What's on that branch circuit?
These videos are filled with misinformation right off the bat they said this tube as with all tubes require very high voltage to operate not true most tubes and I would bet even that tube amplifier runs off a low voltage I've never seen one that operated above 12 volts Intuit the output can be much greater but the input is very low and takes very little to operate that's the nature of tubes and why they are called amplifiers if you had a high voltage to start with you would not need the tube
What third world safety is for suckers country was this filed in? At 3:24 and 4:12 the guy is measuring live voltage with no safety gear, No gloves and the shirt is not arc flash rated I would bet plus short sleeve shirts are not allowed at all. Proper safety gear must ALWAYS be worn no exceptions. This would get me a disciplinary write up immediately following the work, and for good cause. Plus I have done this kind of work and in 20 years have never done it without draining the oil. This video looks put together by someone who knows NOTHING about electricity.
I was waiting to see just what went wrong with the board? I thought that was the point of the video?
HV diodes to service the rectifier board are not available. Substitution of the entire board is the practical remedy. My question is: What is output of this UHF transmitter..?
Given that phase B was low, I would say an open diode. As a short would have caused a fault trip. The noise is from eddy current loss (inductive coupling) in the delta transformer imbalance.
In 2012 there was a 10 minute limit on videos. Be happy with what we got.
At Woofferton we have a large number of high voltage oil filled components. These days we are not allowed to expose our skin to oil. We have to wear full glove protection. It makes the job more difficult but it is much kinder to our health. I fèel for the engineers in this video. Great fault finding technique.
Yeah, but the oil -- even when laden with PCB's -- makes your skin so-o-o soft!
The oil isn't very good for you healt as it may cause cancer.
And you get water in the oil with your skin and you may need to change it after some maintance which is expensive.
@@edwatts9890 HV oil is made from soybean oil these days. They quit using PCBs in stuff like that in the 1980s.
No autopsy of old board? Bummer. Favorite part is seeing what went wrong. Guessing open diode as a shorted one would have raised more havoc.
I was wondering whether a repair would take place. What can we expect from a throw-away and replace society.
(0:46) - "Thirty six thousand kilovolts" = thirty six thousand thousand volts. That's 36,000,000 volts or 36 million volts.
*_SURELY THAT AIN'T RIGHT?_*
.
Valid point!
My thought, exactly! They must run on "lightning in a bottle"!
Definetely not. But we all do these kinds of mistakes sometimes. :)
1.21 gigawatts!
IT is -36,000 volts DC, at about 2 Amps
thanks for showing us what was wrong with the bad board
The board is probably still in the back of the truck...or got tossed into the bin when they got back to the depot.
Just removed 2 of the same Beam supply's. One of our engineers came up with a great idea for pumping the oil out. We had been using a regular water pump. but the pump was beating the, thinner than water, oil to a foam and taking much too long . He bought a "el chepo" drill pump.. That on a heavy duty drill worked wonderful .
Sad to see the good ole Sigma go. Well maybe not that sad..
Use one of those inline fuel pumps that have two hose barbs and runs on 12v. They are typically rated for pumping diesel which is just a thin type of oil.
So what was wrong with that Rectifier board?
Haha wont tell you that as its jus been elaborate click bait
The Dishwasher
its not rectifying! ........................lol
@@joeylawn36111 "was" not "bas" {youtube grammar police}
@@joeylawn36111 Spelling is a part of grammar. FYI !
Likely an open diode. If it failed shorted there would have been visible damage and blown fuses.
No PPE, good practice to use full cover fire retardant clothes + gloves should be used during the Earthing process of the Capacitors.
I was also shocked when i saw him grounding those capacitors with grounding stick and bare hand
RODALCO2007 Unblievable
@@davegoogle7702 It's HIGH VOLTAGE LOW CURRENT as said in the vid
@@DEVONLAD11 I have touched 30KV Capacitor by mistake before and i would compare it to getting smashed by Hulk, it's true high voltage low AMPS are less likely to kill you, but remember the effect of 30KV shock is enough to catapult you with possibility of cracking your head, etc. Certain safety procedures needs to be followed at such a workplace. Personally I would wear gloves just to be safe
Because it was an engineer, all book smart no common sense, measuring 480 voltage with no Ppe, bypassing interlocks with no ppe. “Engineers”
I changed out a large number of high voltage components during my 45 year career. Fortunately, I never had to go swimming!
I thought this oil needed to remain contaminant free?
Not after he just jobs his hand right on in there. . .
Nope. Just dust and debri free. Not contamination free
Also this insulating fluid could have been Askeral or Inerteen (PCB) which is not kind to the skin. What kind of fluid was it? Mineral oil would not be used here since the transformer is in a closed building. I suspect it is not PCB for all such transformers were retrofitted years ago or disposed of. Regardless the tech should have worn long gloves.
@@oldguy2800 The oil will be veg oil based due to inside use or mineral oil ( AKA baby oil )
Yeah the oil needs to be dry and clean. At 55kv it isnt as critical because the parts are bigger and physically isolated, but with X ray stuff you need it dry and vacuumed. I have worked on similar units filled with SF6 gas that output 60 to 260kV at a few AMPS that actually use a high frequency transformer and scary capacitors inside. When these go there isnt a hum, there is a bang...
At the begining you said 31 to 36 thousand KV. That would be 31 to 36 Million Volts.
CreamPie9uy nope kv KILO VOLTS kilo = thousand 31000 to 36000
Dax Marshall
36 kilovolts =36,000 volts
36,000 kilovolts = 36,000,000 volts.
Nope - Daniel Loiselle and CreamPie9uy got it right
CreamPie9uy thousand. Kilo means thousand. Mega is for million
CreamPie9uy I agree
Taking a chance removing the rectifier board under oil. Great risk dropping the mounting hardware.
I did find the troubleshooting technique to be sound however need to employ HV gloves whenever applying shorts and grounds. Lockout, tag out, use of PPE, should be practiced along with human performance methods. Tailboard briefs detail all of the hazards prior to work.
Again troubleshooting technique was sound and reasonable safe provided proper use of PPE applied. Thanks for sharing.
I wonder whether the currents on the three phases were measured afterwards in if they were ok.
it would be a good idea but to be honest ,the buzzing going away should be enough of a indication that the problem was fixed
A faulty rectifiers in the 55kW analog transmitters I worked on was easy to spot...Hum bars in the video from the sagging voltage when a phase was missing.
great now I know how to fix high voltage stuff myself if needed.
Very interesting video. Now i know what that buzzing sound could be at a power station. Thanks!
Lookup "magnetostriction" for more info.
Wonderful and impressive. Please add a little more in basic electrical engineering
And sorry for the omission electronics
This vid was not much use to me, but I enjoyed giving a few responses to the comments.
Is he dressed as an 80s rocker just so he doesn't get the sleeves oily or is that just how he dresses?
The tech was from Kobra Kai Engineering and Karate Services.
The stuff I watch on Sunday at midnight.
133 amps. Pause the video for a moment
My spot welder draws more current than that, pause when contemplating volt*amps (or volt-amps as it's also referred to), that's where the power is!
No PPE man and you touching capactior terminals with bare hands🤔😲
The on line engineer I like your utube videos
Curious what a few strands of hair from your arm or head would do in the oil??
Cool video though! Thanks!
At 36 KV the transformer design is very tolerant of modest amount of contamination.
As stated below, I saw several procedural errors. Improper PPE, Improper grounding equipment, improper procedure. This is not a safety procedure video. One does NOT just get bit by 35kv !
this video was made 10 years ago. things have changed
The on line engineer me and my cousin are going to a Swap meet in September 11 Sunday morning at 8 am in Milwaukee 2022
Galing mo naman po keep vloging niyakap na kita
Not "36,000 kilovolts." That would be 36 million volts!
I wish to have this technical training. I found interesting for my carrier Boost
Even if that oil is PCB free mineral oil it is a bad idea to stick your unprotected arms into it. First he cleans the lid nit to contaminate the oil, then he works with his bare hairy arms submerged. Also the shorting/securing of the capacitors is done in an unsafe way.
I was thinking about that too. When manufacturing transformers, they take special care to have dust free environments to ensure contamination doesn't occur, it can't possibly be good to have skin cells, hair and general grime that accumulates on the skin contaminating the oil.
I hope that there were no poly chlorinated biphenyls in that oil.
One open diode did this in an X ray unit i fixed up. Thing used the same power that these use.
What is the significance of the Morse code at the start? And what is the third character? It isn't international Morse code! BC(dit dit dah dah)TA0WN???
36 million volts ?
+Reggy Love 36000 volts
Reggy Love kilo is thousands so 36,000 volts not million
He said 3600 kilo volts listen
He said from 31 to 36000 Kilovolts.. that is a hell of an high voltage ... ooops
I think you might need more than a 40 cal flash suit for that . . .
Anyone else notice the random lady just appear out of nowhere. Probably walking down the street and like what's going on in there then ohhhh it looks like he need help.
What happens if you drop one of those wing nuts into the case ?
Wouldn't the moisture and salts from that guys arm contaminate the oil ?
There's probably 400 gallons of oil in that thing. It can handle a few impurities.
6:43 All that lovely PCB insulating oil soaking into your bare arm. Yum! :-)
It’s mineral oil you tard
'tard' is unnecessary.. but yes, the oil has been PCB-free for decades.
@@drlegendre DId thay change the oil
@@brm7469 would not be mineral oil!
@@oldguy2800 Yes it would...
I thought that the rectifier board needed to be "tested". All we saw is that it was swapped-out. Was it tested, or just assumed to be bad?
Lower amp draw on one phase with loud hum means one diode stack is open and maybe arcing inside on the less current drawing phase. It was assumed but swapping is a bit quicker than diagnosing and fixing, also IME when one diode goes the rest are not far behind, replace as a set like spark plugs and wires.
When you measured from phase to ground I assume the neutral is connected to ground.
It is not strictly necessary to have a neutral in a three phase system. When this is the case, for example if the three phase power is generated by transformer windings in a delta configuration, the circuit is usually grounded via a grounding transformer. In that case you measure each phase with respect to ground because indeed, the only thing the 'neutral' is connected to is ground.
The oil looks less viscous that I expect an oil to be.
This is interesting to look at
Woah 31 to 36 Mega volts ??
Thank you. Great video!
Are those high voltage PC B oil Transformers
What is the power output of this UHF transmitter? 500 KW?
4:50 What is the capacity of capacitors by how many volts ??? Are they connected in parallel ???
36 million volts. No wonder it was humming.
So the buzz comes from a out of phase voltage?
Ø1 and ø2 was 8% above ß77db kV. This could cause short circuits.
Divide the anode voltage with 1000 and it's correct!
What is the function of rectifiers in a high voltage AC system?
HV DC for transmitter valves or tubes.
" 36 thousand kv " ? Wow !!! Imagine a power transmission line on 36.000 Kv .
Adrian Sorin Popescu at brazilian/Paraguayan Itaipu plant high power transmission lines, as long as I know the voltage is 400 KV dc...
nice nice educational video!
for sure the oil is very healthy on his skin
thirty six thousand kilovolts. No, it doesn't rely on that voltage. divide by 1000
why does the high voltage rectifier board dont have any circuitry/chips?
because it's just a full bridge rectifier, it's just diodes connected in that configuration shown in 3:58
how hot and how long before you can stick your fingers, hands or arms into that oil ?
Wolfcat Wildcat Depends on the individual's pain tolerance...
They should put an IoT on the IOT so it can post tweets about its feels and then the engineer can report it for hate speech.
00:45 Thirty six thousand Kilovolts! Surely some mistake.
❤️ that BUZZ!!!!
where's that guys PPE?
PPE ain't gonna stop him from getting electrocuted if he touches something bad LOL
parteibonza appropriate PPE minimises the risk
OSHA wasn't in the area that day. It's good to take the short cut.
Safety is not a management priority until someone gets injured or killed. Most stations will provide no help to the transmitter guy and PPE is just a waste to them. The management has usually never been to the transmitter and would not know how to find it. Hint: It is nowhere near the golf course. They will, however, keep calling the transmitter to see when we will be back on the air. Even in a station like the one pictured (A-B parallel operation), They seem to think: A. We are still on, I see a picture, B. 50% power! We are losing half of our viewers! c. Will this be expensive? D. No overtime, period. OH, It is not PCB oil... It is some sort of mineral oil. Not to worry.
Awesome :D Thumbs up :D
Alex
If you are not going to fix the board, then why bother watching?
It's not 31 thousand Kilovolt but 31 Kilovolt.
Hope that dielectric oil is not carciagen!
you misspoke. 0:45, it's 31 to 36kv not 31 to 36 thousand kv, which would be 36,000,000 volts. lol I don't think so.
0:45
31 to 36.000 kVolts? So it's up to 36.000.000Volts so 36Mvolts?? Or did you mean 31 to 36 kV
36000 kilovolts? You sure you are an engineer or just an online one haha I'm kidding honest mistake certainly. I never knew their were inductive tunes for radio frequency that is awesome 👌
Word of the day: HYSTERESIS (learn it)
Again?
At 0:46, it’s “31 to 36 kilovolts,” not “31 to 36 thousand kilovolts.” Great engineering problem solving video, though.
0:45 ...31 to 36 thousand kilo-volts... erm,
Kilo is thousand so it’s only 31,000-36,000 volts
Are you just a troll or plain stupid?
Who
That one Guy Well.. you
@@darhat3911 Yes, but he didn't say: "31 kilovolts" which would be 31,000 volts.
He said "31 *_thousand_* kilovolts" which is three orders of magnitude higher, or 36 million volts.
The on line engineer my hobbys are painting pictures and lisining to shortwave and ssb iam thinking about getting my ham license I have 4 shortwave receivers
36 000kV.....I find that unlikely
so, what was wrong with the rectifier?
faulty diode, most likely.
Probably an open circuit diode in one of the phases resulting in a 25hz component in the output. Thus the buz
36-thousand kilovolts?... 36-million volts? :-D
At lease ONE other person was paying attention...
I am having trouble with my rectalfier
That sounds painful.
Uhh...
...I believe that, in your case, the term should be "rectumfrier", with "rectalfrier" running a close second.
Unreal Tournament, based
36,000 Kilovolts ? That would be 36 Million volts. Further on they show using a standard volt-ohmeter to read three phase voltates. Can't be done ! Must use a three phase voltmeter.
You can measure each phase separately! A domestic lighting circuit is on only one phase and you can measure voltages in your home.
Fais beaucoup de bruit le roulements de l’alternateur
Well, so much for safety..
36 kV is NOT 36 MV.
euh bro, ever heard of wearing gloves before placing your arm into dielectric oil
When he was wearing gloves I thought, if he isn't careful the oil is going to go over the end and soak his hand, then he just takes them off so I'm like, OK, nevermind. Wouldn't it just make everything you touch kind of oily?
@@richardemms3050 Thats what I was thinking, but it appears he was actually wearing the gloves in case any of the submerged capacitors were holding a charge. Once he was sure they were discharged, he took the gloves off. I guess getting zapped under oil hurts as much as getting zapped in air.
why is it submerged in oil?
Michael Epps coolant
To keep the electricity flowing smooth
Cooling and electrical insulation.
thanks for the responding to my question
Oil is a lubricant and allows the amps to flow more freely.
Isnt this oil toxic?
transformer oil used to have PCB (toxic) in it but that was not used in transformers after 1977
No, it's actually good for the skin. It is mineral oil like they put on a baby's ass.
Where are the fans? Are the fans big?
31 - 36 thousand kilo volts? What, is this guy on drugs? You mean 31-36 thousand volts. Or 31-36 kilo volts.
Yes, I know that and you know that. I was just trying to get a reaction. Keeping folks on their toes.
36 thousand kv💀
31 to 36 thousand kilovolts???????? NOT!!!! You mean 31 to 36 kilovolts.
36 thousand killavolts or 36 killavolts? How many Nigga-watts is that?
Hahaha I doubt it requires 36,000kv.
I think you mean 36kv
that intro is ultra cancer..
ikr
voldage.
36kv
4:11
00:00 sonido de amon us xd
BOY .... Brown, orange, yellow. Indicates on visual hi voltage. Grey can be the neutral. Out of balance happens on 120/240 VAC, single phase in homes also. Amprobe test first 2 poles ... should be same. Then test SP breakers on each phase n note amps by circuit number. A= B amp draw is balanced. Swapping due to each owners bldg use will be different. So u swap wire, not breakers, until A does equal B. U can save consumer between 10 to 15% on bill. Measured n proven. While ur at it .... set up a breaker control index/legend of circuit control. What's on that branch circuit?
These videos are filled with misinformation right off the bat they said this tube as with all tubes require very high voltage to operate not true most tubes and I would bet even that tube amplifier runs off a low voltage I've never seen one that operated above 12 volts Intuit the output can be much greater but the input is very low and takes very little to operate that's the nature of tubes and why they are called amplifiers if you had a high voltage to start with you would not need the tube
What third world safety is for suckers country was this filed in? At 3:24 and 4:12 the guy is measuring live voltage with no safety gear, No gloves and the shirt is not arc flash rated I would bet plus short sleeve shirts are not allowed at all. Proper safety gear must ALWAYS be worn no exceptions. This would get me a disciplinary write up immediately following the work, and for good cause. Plus I have done this kind of work and in 20 years have never done it without draining the oil. This video looks put together by someone who knows NOTHING about electricity.