Recent content by Aussielec

If you leave the neutral point of the system floating your line to Earth voltage will vary depending on phase to Earth capacitance. Generally speaking the XC to Earth will be far to large to create a solid voltage reference to earth. In which case yes, if you were touching one phase and Earth at...

In a IT earthing there is no active or neutral conductors, just line 1, line2 etc. So all conductors need to be switched. In the occurrence of a second Earth fault the system will behave similar to TN or TT system;If all exposed conductive parts of the installation are interconnected by a...

If your in the US, which I assume you are, they use what known as TN earthing. Which means all your "grounding" wires are connected directly to your main neutral in the switchboard. This insures that a fault with a bit of equipment turns into an active to neutral short circuit this in turn...

I'm going to take a guess and say that it would be a corner grounded delta supply. I do believe all your protective earthing conductors are bonded to the grounded phase back at the main switchboard, this provides your low impedance fault clearing path.

Are you sure it's not TT, IT and TN? A TN-C-S system is a form of TN protective earthing (TN-S, TN-C and TN-C-S). Anyway yes we can help you but you need to ask a question first. Are you looking for advantages and disadvantages of each system? Applications? Operation? Types of protective...

I'd say the biggest advantage of a star connection over a delta is that you have two voltages available, as opposed to just one. That said you can centre tap one of the delta windings creating a high leg system where you actually have three voltages available.

When connected in delta line and phase current will be different. But this what I can't understand- Where is this 100 amps measured from? The generator windings or the line? The question reads. "supplies a full load current of 100A"? But from where?

Hi JGrecs, my answers. a)240 volts b)100 amps c)240*100*1.732=41.6KVA d)240*100*1.732*0.6 =25KW The thing here is that the question IMO isn't worded very well so that might be half the problem. Remember when connected in delta the line and phase voltages are the same, while phase and line...

Forget about functional earthing at the moment. Functional earthing/grounding is about anything other than providing an earth/ground for shock protection-eg signal filtering, static protection, interference etc... Any earth/grounding conductors in your house will be protective earth/grounding...

No, there is certain answer it's just that there are different types of earthing- Protective, functional and lightning suppression are the three different types of earthing/grounding. The big problem is that "earthing/grounding" is to much of a general term and many people tend to get confused...

Sorry thebluser your question doesn't make sense. How do you propose to increase current? Undervoltage, overvoltage and load will all increase current but won't necessarily increase speed. Maybe the answer is increasing line frequency?

Correct. If where talking about "grounded system" your neutral will be connected to the Earth's surface at the transformer. And depending what country your in the supply line neutral might also be connected to Earth at regular intervals and at the installation. This creates a situation...

Thats the way I read it. It's asking how much additional load can be added to the transformer assuming all additional loads have a PF of 0.8. So yeah, 48KW of true power will give you an apparent power of 60KVA at a PF of 0.8.

It shouldn't. If you connect two heater elements both with equal resistances between the two phases they will be series and the voltage across each would be half your line voltage. So 400/2 which will give you 200 volts across each element. If however you add another element of equal resistance...

Alright let's take a step back here for a second. Couple of questions. Where did you take these voltage readings at? Did the voltages return to normal once you reattached the neutral? Is your chiller motor single or three phase? Have you tested the compressor to see that it's actually...