Generator Question Involving Construction Equipment

Are you sure it's English?

Wangito.

Yogi:

I haven't been around the industry for some time, but I have a couple of questions.

1. Are you using electric vibrator needles because you prefer them over pneumatic ones?

2. If you find machinery that works at 300 Hz, won't you need to get new needles?

3. What is the advantage of machinery that works at the greater frequency?

Mark

Okay before this gets any further, your explanation is a little strange,

A large standard electrical generator can be used for 480, 220, and 110 volt outlets this or a large portable diesel welder as they also have a generator in the welder.

If I understand you correctly- if you are using four vibrators what you need to worry about is having enough amperage to power the vibrators and a 440-480 volt 50 cycle generator will handle the load effortlessly.

Assuming your generator power is 440-480 three phase 50 cycle which is what it should be to begin with rather than what you have stated-it will have multiple outlets for your concrete vibrators and you will not have any problems relating to the amount of electricity needed to power the vibrators as you are recieving as much electricity as the generator will produce all the time- especially if the generator is operating continuosly or when additional load is called for with a demand cycled generator.

When you use a concrete vibrator you are converting electrical energy to mechanical energy to compact the concrete and eliminate air bubbles and to guarantee filling of any voids during the pouring of the concrete.

As along as you have deliver a high amperage-20-50 to each outlet you will have no problems.

Hi mtararat,

"Assuming your generator power is 440-480 three phase 50 cycle which is what it should be to begin with rather than what you have stated-it"

It all depends on where you are and the voltages you have quoted are only valid in North America and parts of South America. Most of the rest of the world uses either 220 or 240 V AC phase to neutral. With a 240 V phase to neutral 3 phase system you phase to phase voltage is 415 V.

In other words 415 V 3 phase is not an uncommon voltage to see outside North America and is the norm where a 230 V supply is used.

Masu,

Greetings and salutations,

My apologies,

I have spent my entire working life around 60 cycle 220-240,single phase 460-480 three phase, 600 volt dc, 2300 volt ac and 4160 three phase in volved with surface and underground mining equipment.

Gidday matrat,

We have a much simpler final stage supply system than you have in North America. We only have a single end user voltage and that is 240/415 V 50 Hz AC. Most domestic residences only use a single phase 240V phase to neutral supply. If you need more grunt then the next step is to use the three phase supply which gives you the 415 V phase to phase. If you need more grunt than that then the next step is the 11 Kv three phase supply that is the next step up the transmission voltages.

One of the main driving factors behind the 240 V supply is the distances that we need to transmit power. If you used 120 V and wanted to keep the line losses constant then you can only transmit one quarter as far.. That means 16 times as may final stage transformers for the same area. Considering Australia is pretty much the same size as the USA that would make the distribution of electricity an absolute nightmare.

The lowest transmission line voltage is 11 Kv and it you look at the power poles you will see that there are two separate systems. The lower one is the 4 wire 240/415 volt system and the upper ones are the 3 wire 11 Kv system. They just stick in a transformer ever now and then to create the 240/415 V system.

There is another system that is used where the end users are to dispersed to use the 240/415 V connections and that is a Single Wire Earth Return SWR system. A single line is sent to the end users location and a transformer then steps the voltage down to 240 V. There is no return cable as they connect one side of the primary winding on the transformer to ground.

The split phase system that is used in North America to supply 220 V is never used in Australia at all.

If the "star" voltage is 230V then the "tria,ngle" voltage is 2*cos(30°)*"star"value=2*230*cos(30)= 398 V. usually the voltage is atound 220V and the triangle value only 381V(rounded at 380V.

Generators provide the power, AC at 415, 50 hz

The Frequency converters are typically electronic components:

1 a bridge rectifier and filter that converts the output from the generator to DC

2. an oscillating circuit that creates a new frequency and is tuned to the output frequency or a multiple as required.

3. a dividing or doubling circuit to get lower or higher frequencies

4. an power amplifier to adjust the power level

Is the net effect of a higher frequency in the supply on the efficiency of the needle that it will ease it in and out of the mix more easily???

Mark

You are a braver man than me if you are going to hold on to a vibrating poker powered by three phase 400V+ on a construction site. Certainly in Europe it would be illegal - thats because it is highly dangerous! ALL electric construction equipment in Europe must be powered by 110V DC and you should do the same my friend before you kill someone. And what on earth is leading you to think that you need electrical output at a higher frequency to get 'faster' operation of your concrete poker? They work on a mechanical frequency not electrical freq of alternating current. If you need to vibrate concrete go and buy a poker off the shelf - there are many of them al different sizes both petrol powered and electric powered.

Alf- Bravo , Bravo, Bravisimo, I offer a toast of Guinness to you for your comment regarding this mess apparently he does not understand how these critters work on the mechanical side of things.