I am looking for information on electrostatic oil cleaners, for use on a hydraulic oil system. We are having problems with the build up of varnish in the system. The hydraulic system is used on a steam turbin and operates at 1200 PSI.
Can anyone point me to a good sourse of technical...
Hi,
I am looking for information on electrostatic oil cleaners, for use on a hydraulic oil system. We are having problems with the build up of varnish in the system. The hydraulic system is used on a steam turbin and operates at 1200 PSI.
Can anyone point me to a good sourse of...
HI,
Several folks on this forum, plus discussions with other electrical engineers, has convinced me of the need to install High Resistance Grounds (HRG) units on all of my 480 Volt and 2400 Volt ungrounded delta substations.
I have been allow to purchase one unit, so far...
HI,
I would like some opinions on this. A Mfg. rates a small single pole relay at 40A/250VAC. The applalication the relay is used in, the current the contact will normally see is vary low, on both make and break, maybe less that 1 amp. Its used to bypass a set of SCR's, which will be fully...
Hi, All
I just read the 12 or so, different post about soft starters, and I have a different question reguarding the use of these devices.
We have installed several SMC soft starters over the past six months. They are on a 25 HP motor, 480 volts 3 PH. The 480 volt power system is an...
I would like to have some discussion on using VLF-Very Low Frequency AC Hipot to test MV power cables. Is anyone on this forum using it and what is your experience with this technology. How often do you test your cables? How long have you been using this technology? Etc.
What are the pro and...
I am having a discussion with out Mechanical Integrity engineer about the need to pressure test the pressure relief devices on our oil filled transformers. He wants to know if we can raise the pressure on a transformer, to measure the pressure that the pressure relief device opens. I have...
I am using SKM Power Tools software to model my power distribution system. Does anyone know of a good source of device library files for use with SKM software? This is an old plant and a lot of my older protective devices are not in the library files that come with SKM. Thanks
We have a lot of capacitor banks in our plant, both 480 volt, and 2300 volt. All of the capacitor banks were installed in the early 80's, when we disposed of all capacitors which had PCB in them. We are now experiencing capacitor failures. We have never performed any testing of the capacitor...
As part of my equipment strategy, I am planning on doing some Partial Discharge Testing of my MV Switchgear, MV Cables and Generators. My MV system is 6900 VAC. I would like to hear comments, pro or con, on this type of testing technology, from any one who has used it in their PM programs...
I work in a large industrial plant, which was built in the 1940's. We have 35, 6900/480 Volt substations. All of the transformers are delta-delta, and the 480 Volt systems are all ungrounded. For years, we have had our shift electricians check each station once a day for any grounds. Most of...
