Power bollocks

I was just reading Christopher Booker’s  article this morning in the Telegraph this morning.

We could soon be paying billions for this wind back-up

In it he explains the Bizarre thinking that to stop the lights going out the government is going to use all the backup diesel generators that exist in hospitals and other places that need to have an emergency supply of electricity.

The answer National Grid has come up with, only made possible by the latest computer technology and “cloud software”, is to hook up thousands of diesel generators, remotely controlled by the grid, to provide almost instantly available back-up for when the wind drops.

Personally speaking as an engineer that has spent most of his working life working with diesel generators, I think it is a disaster waiting to happen.

I don’t see how it could work.

1. All types of generators have a different “Characteristic”. Steam turbine generators, gas turbine generators, and diesel generators all respond differently to changes in load. All these generators have to supply power within a narrow frequency band either side of the grid frequency of 50 Hz. Usually within a maximum of + or - 3 Hz. How is your local hospital’s 1 Mw diesel set going to respond to the response of  a 2 Gw gas turbine. The danger is that unless the load sharing is precise (involving electronic governors these days), you could end up with a gas turbine actually “motoring” a diesel generator. In other words the DG is being driven electrically against it’s will. NOT A GOOD THING. It usually ends up with large lumps of diesel engine deciding to spread it’s self into it’s component parts. (I know. I walked past such a generator 5 seconds before it did it.). That’s your hospital fucked in the middle of winter when the wind turbines are not working.

2. All emergency generators are just that. They are arranged that if the mains power fails they are an autonomous entity.Just there to  supply the Hospital, public building, brothel, etc. Usually they are arranged that if the main supply circuit breaker drops out due to mains failure, the standby diesel generator will start and then close it’s emergency breaker onto the needed system.. QED. For safety reasons, the mains supply breaker and the emergency supply breaker are interlocked so that neither can be closed simultaneously. I’d love to know how they are going to load share between their patients and the grid?

3. As above. Does the hospital, if the rules change on electrical safety, save it’s patients or sell it’s Kws to the grid?

I feel that this is a cynical ploy by a government that has lost the plot on energy production to try and calm the average citizen, that the lights will remain on.

I have candles.

No need for words.

Oh well. Just two. EU Fail.

The day after 2014.

It would seem that successive governments have totally fucked up (Not unusual), their energy policies.

Green rules coming from the EU threaten to plunge Britain into 1970s-style blackouts in three years and lead to energy bills doubling.

Millions could be pushed into fuel poverty – having to choose between heating or eating – because Brussels diktats are closing power stations needlessly, the Government’s energy regulator warned yesterday.

The plants that remain in Britain will not be able to keep up with demand by winter 2015, a dire report from Ofgem predicted.

Each successive government has tried to out-green the last one, which unless this strategy is quickly reversed, will result in rolling blackouts.

Those born after the 1970’s will not realise what misery that caused at the time.

Imagine if you will, in the middle of winter, the electricity in your home is switched off for eight hours in the evening.

No lighting.

No electric cooker.

No kettle.

No central heating

No TV.

No power to sterilise your baby’s bottle.

No hot water for your shower.

No washing machine.

No internet shopping, facebook, E-mail, etc.

Just add all other devices that rely on electricity.

Personally I would relish the fact just to see a few of the new greens dying in their beds. I’m lucky in that I have a very large fireplace and will stockpile logs in the eventuality that blackouts are threatened.

I would also suggest buying a portable generator to power the central heating, and low powered electrical items.

And stock up with candles.

Electrickery

I’ve just got back from the eldest daughter’s house (Again) and on arriving there I was tasked with fitting a couple of dimmer switches. A simple task not really requiring much brainpower. Isolate the circuit, unwire the existing switch, replace with the dimmer switch, and reinstate the circuit. Job done.

Of course some would have it that I should, at vast expense have called in a qualified electrician. They would be wrong in their thinking. I actually hold a high voltage certificate that allows me to work with voltages over 1,000 volts. I had to obtain this in order to enter spaces and work upon machinery operating at 6.6 kV. (6,600V for the non technically minded).

The other qualification I had was that I’d worked on a class of ship that was not complemented for an Electrical Officer. I became that man. Alongside my other duties of looking after the main diesel generators, and the refrigeration plant. Being somewhat suspicious of a killing energy that can’t be seen I took extreme care to make sure that I followed the rules of “Isolate, test, test again, and work on it”. (Once I disobeyed my rules and touched a live circuit with 440V. Never again. It threw me six feet and I was probably unconscious for a minute or two).

Now to the crux of this post. Familiarity, adverse conditions, and sheer bad luck come into play. My outfit started to man the ships with electrical officers. Of course, us amateur electricians were told by these electrical officers that we had done a piss poor job. This pissed off most of us that had done the job, whilst holding down at least two other jobs (See above).

There was a problem with the control panel for the refrigeration rooms. The only way of sorting this out was for the electrical officer to switch of the power, open the door, and fiddle the door interlock controlling the main power switch to reinstate the power to enable fault finding to begin.

The sad part was that the ship  was rolling, the deck was oily, and oh dear, the lecky pitched headfast into the cubicle, striking his head on the 440V bus bars. And sadly that was the end of him..

Now you may say that I’m being disrespectful of the dead with the next part of the post.

After the body was removed from the vicinity it was realised that the body would have to be preserved until a post mortem could be carried out. That was the excuse for all the engineers to collectively define the initial problem and rectify it. The body needs to be preserved in a cool room. (Bye the way, never store the body in the deep freeze. Coroners will crucify you for that).

However I heard through the grapevine that the real cause for concern was that one of the refrigeration chambers was exceeding it’s set temperature. This was the “Beer Room”. Engineers can’t abide warm beer.

OK I’ll rot in hell if you wish. But I’ve heard this from multiple sources that I trust.

Moral of the story: You might be the expert, but circumstances can kick you up the backside without warning.

I may not be back tomorrow.

I’m off to my daughter’s new house to do some work there.

I have few innocent sounding jobs which in theory shouldn’t take long.

I have to plumb in their newly acquired dish washer. This plumbing should not be as difficult as this though. Just a matter of nipping down to the nearest DIY store, buying some assorted bits of plastic pipe and Bob’s your Uncle.

Fitting a couple of dimmer switches. This won’t cause my early demise as TFE has successfully completed the High Voltage course and understands that electrickery has the ability to hurt. In past years I was actually the engineer that looked after all things electric on a particular class of ship. (I admit to being thrown across the engine room by inadvertently messing with live 440 volts. Ouch, shit, fuck, etc).

A new cable to fit to the daughters hedge trimmers. (I heard you snigger at the back. Stop it).

No. The one thing that may hold me in more of a slough of despair, is that I’ve got to assemble that spawn of the devil, FLAT PACK furniture (Weeps).

Still, I shall hold my head up bravely and accept the challenge.

I shall return.

Electric cars.

Thinking of buying an electric car and saving the planet?

If you look at the diagram above (Sorry for the poor quality), you’ll see what is required to get the power for the car battery from the source.

Lets look at the efficiencies of the various parts of the diagram, starting with the generating station first. Even a non CO2 emitting nuclear plant is at best 30% efficient due to the lower steam temperatures employed. That’s a start down the slope.

Next comes the step up transformer. Ever wondered why they have to be oil cooled? Using a step up transformer to increase the voltage does not give you something for nothing. As the voltage goes up, the current goes down by the same proportion. The power equation shows that the overall power remains the same.

P=V x I  Power = Voltage x Current

In reality, the power output is always less than the power input because the changing magnetic field in the core creates currents (called eddy currents) which heat the core.  This heat is then lost to the environment, it is wasted energy. It’s actually not too bad at 2%. But 2% never the less.

Now we come to transmission of this power. This is usually transmitted at voltages of around 133kv in the UK for long distances. Here again we lose energy. Estimated at approximately 6%.

Of course we now have to transform it down again to a realistic voltage for consumers to use. Another 2% lost.

Bearing in mind  charging the batteries of your electric car is going to involve turning that AC voltage into a DC voltage and step down to a voltage that will be suitable for your battery, the efficiency falls further. Lets say another 2%.

Overall by my reckoning that makes the whole jiggery pokey to have you on the road is about 58% efficiency overall.

Contrasting that to a modern common rail fuel injected diesel engine at 50% efficiency,  the efficiency is not vastly better.

Of course you have to buy the car first before you can drive an electric vehicle on the open road. Now the agony really becomes real. Even with a generous government subsidy (£5,000), a Nissan Leaf is going to set you back a whopping £25,990.

And for that price you only (On a good day) get a mileage of 109 miles between charges.  

And finally the cost of a replacement battery will set you back over £5,000. (Conservative price. Some sites have reckoned it could be as high as £8,000).

Still want to buy one? Me. I’m sticking to my diesel powered car, which has a range of 350 miles even when my heater is on in the winter. I don’t want to take 3 days to visit my son. (And three days back) After all, who would feed the cats?

Not my type of job

You know you shouldn't play with electricity but..................




H/T to Theo