Recent content by UKEng

Scotty, I am a UK Engineer working in the Oil & Gas sector. We are in the process of purchasing SKM PowerTools to carry out our study. We will be using the arc-flash module as previously described. We have made contact with PPE suppliers in this area and are moving forward with the project...

P&B Engineering in Manchester do an excellent 3-day course that will suit your requirements. regards

jbartos, After further ivestigation, please find the following. The original design was done in Japan and approved in Japan. Apparently this is the standard earth fault setting over there. Alstom built and fitted these components as per design. I rang Alstom UK and their recommended...

Kiribanda, The 3.3kv system is resistance earthed which limits the earth fault current to approx 400A. We used a single phase injection set and passed the test lead through the centre of core balance CT and raised the current until the relay tripped. The earth fault has a time delay also. The...

Hi All, I am starting to commission a new chemical plant and have come across the following. Motor Volts - 3300v Motor FLA - 106A Motor Protection - Gemstart 4 Normally I would accept the Earth Fault Setting from betwwen 10% - 20% of FLA, in this case approximately 10 - 20A. We primary...

JEA G 9702-1995

On a cable 'electrical characteristics' sheet what is meant by 'equivalent star reactance per 1000m of cable at 50Hz'. i.e. what is the star reactance. many thanks

I have not used this this method myself but have heard from other Engineers who use this as part of their routine maintenance. Apparently it is no use at lower voltages but is useful at voltages of 3.3kv and above. The benefit is that it is non-intrusive and gives a good indication of partial...

In the standard for Inspection and maintenance of electrical installations in hazardous areas, what is meant by 'continuous supervision' and in what instance would it apply?

I forgot to add this link http://www.hi-potential.com/products.asp?ID=8

The DC earth fault locator is known as a 'Grouser'. I believe it injects an 11hz signal into the cable and is traced using a horseshoe shaped pick up unit.

Thanks bigamp, a star for you. Would it be possible for two or more generators to be run in Isochronous mode or would you you only have one of them in this mode. thanks

Could someone please explain the difference between 'Isochronous mode' and 'droop mode' when talking about two diesel generators connected in parallel on it's own common bus and not connected to a utility. Which method would be the best way to run these. many thanks

Hi, Could someone please explain the term 'field flashing' with reference to generators. What is it and how is it carried out. Many thanks in advance PaulUK

Hi All, What are typical values of fault levels for generators with respect to their ratings? Also could someone explain what is meant by saturated and unsaturated conditions. Many thanks in advance Paul