Orange2k4, yes.
The gas in neons is of two types. Argon and neon. One is red and one is blue. Any other colour is obtained by using coloured glass to produce the other colours. That is why the other colours including orange, are dimmer than red and blue.
Just for interest, if you look closely...
Dear Laplacian, please consider the following:
money for testing, if the company can lose $200k/hr for lost production, then they can be kind enough to give you some money for investigations:
I would recommend you obtain some clip on ammeters AC/DC that can measure the small currents you are...
Manindemand, on our system, an event occurred where one transformer was on tap 5, and the other was on tap 17. Something was wrong with the (new) On Load Tap Changer relay circuitry to allow this to occur. That's another story... What happened was that one of the transformers tripped out on...
-Appunni
If the 66kV winding is solidly earthed to the earth grid of the substation, then up to now I assume you have been using 1000v rated wire (70mm2?) to earth the star point.
Therefore, if you now place this cable inside a CT you will be able to use a 1000 volt insulated REF CT.
If you...
Vandex, Faulty is right. With a good sensitive neutral CT, sensitive setting and long time delay, lines on ground can be detected.
Years ago I was in a utility that did tests, including placing 11kV conductors onto bitumen, concrete and rubble to see what fault currents would occur.
They also...
Hello Hiset, if you intend pursuing this REF relay, please check the following:
ask to see a COMPLETE manual that you would need for this relay. Ask yourself a question you might want an answer for and try and find it in the manual.
ask if you buy a relay with half the options and you want to...
Whichever relays you choose to use, make sure the eng comms protocol is not a proprietary one. The cost of getting converters can be very high or impossible. Also consider what is needed to download / upload settings and records. Do you have to pay for the software?
jlgordon,
the company I work for also used to make their own relays components. Now we make practically nothing, we buy everything. My company also used to test in the laboratory everything we used in the substations. Now we test everything at site during commissioning. I won't discuss relay...
Hi everyone, I experienced electrolytic drying out in a relay of one manufacturer back in the 1990s with a relay that came out just before eproms.
Back in those days the company I worked with had time to try to do basic fault finding inside the transistor logic.
In this particular instance the...
Dear bholaS and zub,
the network I am involved in had a large fire in a critical power station of our network. It resulted in our 275/132kV system breaking up, load being tripped off by underfrequency load shedding, isolated network volts running very very high and some of our new transformers...
I understand Bung's point of view, because we have a project where they are shuffling transformers around from one place to another, refurbishing them between substations. This sounds fine in theory, and on paper they found a saving compared with buying new.
But in practice, they found water in...
Comment:
Relay testing and relying upon the relay to let you know if it is in trouble:
Only trouble with self testing by the relay itself is that we had a P44x series Alstom relay that had the potential to stop working after a few weeks from maintenance testing, without making the internal relay...
Comments: I too have seen CTs on paralleled conductors within CB busbar ducting to balance out current in the paralleled conductors. But for the 1500-2000 feet distance the, emf required to balance the currents means the balancing CTs will have to be very big (educated guess).
Furthermore, if...
Zub, if you go to the IEEE web site and look at especially industrial applications, you will find a myriad of articles including colour pics to help you. Once you are at this web site, you will only require a few minutes like busbar has suggested to see the abstracts.
cheers Johnspark
