ScottyUK , thank you for this emphasys . I know this test, being an inspector, but by reading the other remarks I wrote it for pin pointing the safety problem . My feeling was that shkim2000 is not an electrical engineer . I believe that it is safer to use the testing equipment when there is a...
shkim2000 hi , rcwilson gave you a very nice review but I would not recommend any experience that will include creating a short circuit especially on the high voltage side as this request tons of precautions and only I repeat only electrical engineers are alowed to do so by all the regulations I...
Hi shkim2000 , if your system is 230V , according to all standards your isolation minimum value is 600V but it is usually requested to be at 1000V isolation . Be sure that you are not in an area wher regulations will force you to have higher isolations as in some European countries the requests...
Hi vanskat , improving power factor may be very tricky somtimes . As you say you took in consideration resonance and other issues . Did you take in consideration your grounding system ? Do not forget your capacitors are connected between phases so if your supply to the load is a delta one (...
Hi DaveRosser , as you see in the answers you already got the answer is not simple.
In fact it all depends on two things : your electricity provider regulations and your grounding regulations . According to IEC regulations if your system is a TNC-S system or a TNC system ( neutral grounded at...
Hi, First I would like you to be very very carefull before you try to install any added solution (transformer or anything else) as this might destabilise completely your network and lead to local resonnance with all its implications. If you can forward the grafs you got from your Dranetz it will...
IS IT POSSIBLE FOR YOU TO SEND A MORE SPECIFIC DESCRIPTION OF YOUR QUESTION SO IT WILL BE POSSIBLE TO SEND A CLEAR ANSWER.
AVISHAI A.Rash BScEE & PE
a_rash@bigfoot.com
The two answers are wright . You have to take in account also that the utility is much stronger than your generator and as a result much less successible to let harmonics develop in the network. You have to be very careful about resonnance problems that my trouble your generation system .
As...
What you need is in fact to disconnect the connection of the signal grounds between the amp stages .DO NOT MIX SIGNAL GROUND AND REGULAR EARTH SYSTEMS !!!!! After you separate those grounds you will have to insert an RFI-EMI filter (like Aerovox systems but you have different brand names...
wbd is wight we need more information to help. Remember that in high voltages you have some additionnal rules than low voltage in choosing equipment.
Send more details and you'll get more detailed answers. A.Rash BScEE & PE
a_rash@bigfoot.com
The best way to start in this is to find a copy of IEEE519 and IEEE1159 wich will give the guidlines . After that according to the network you need to analize you build your survey program .
After that you need help ask and I will make my best A.Rash BScEE & PE
a_rash@bigfoot.com
Harmonics may alter your measurements as you measure an alterred wave with equipment built for sinusoidal waves. It may happen that during your measurement the distortion will increase or decrease the quantity measurev (V I) or it may disturb the impedence of the equipment used to measure . For...
The main effect of harmonics is in the description of RMS values (current and voltages).As explained by Julian many of the devices connected to a distorted network would have higher or lower voltages/current . This is very problematic to three phases system but in single phase system the effect...
Be carefull before you choose a filter of any kind !!!!!!
Two of the most common problems resulting from wrong filters in the network might be :burning of the filter and vicinity and / or explosion of high voltage to low voltage power transformers supplying the network.It is crucial (!!!) before...
