I read that, back in the day (as late as the 1950s), places were still supplying town gas/water gas/coal gas/producer gas/city gas to houses. It was supplanted by NG by the 1960s.
Made by quenching some sort of burning carbon solid with water in the absence of air, which made hydrogen, carbon...
I wonder if the utility has uneven loading on their system and in the afternoon, their voltage balance between phases gets out of whack. I think that is what you said.
Maybe I am a simpleton, but why can't a dust collector be run direct off the line? Eliminate the VFD and all associated...
The reconnection strap area looks awfully three-phase-ish to me. It is hard to see from either of these photos. But in the reconnection area photo, the upper six terminals appear to be connected as a wye point, with three large neutrals leaving the box. The lower six appear to be the 3 active...
I just came to this discussion to see if any of you with experience could comment on the red forest trench-diggers' irradiation. Is there good intel that this is a true story? What would be the likely source of the radiation that they may have received?
Speaking from practical experience, there is no way a pair of XW inverters has enough stiffness to shear any bolts in a 30 kw genset. I suspect a purely mechanical problem.
I don't know about other brands, but the general advice on here has been to use one from a big name mfr.
Hitachi makes single-phase-intended units, and we have one and it has been performing well.
https://hitachiacdrive.com/hitachi-nes1-series-ac-drives/
Exactly.
Jobs have a couple of purposes: to make the company money, but also to expand the prestige and experience of the company. And certainly they must never detract from the prestige of the company.
To echo Jraef's story. If I see a project has no technical merit, I decline to be involved in any way. Whether I see there is money involved, or not.
There was a customer of ours who also wanted some sort of "filter for dirty POCO power" installed. I respectfully declined. A colleague took...
About 60 years ago, there was a cluster of these new, larger dams being built or enlarged, as well as smaller stream storage.
Our family was involved in some of the smaller projects.
They knew the the variability of the seasons and they saw the need. It was always conceived as 5+ years of...
In case I have not made this clear. There is no probability of all loads starting at once. The large fan does not start until controls tell it to start, and air conditioners these days all have variable delay built in.
I understand how SCR soft starters chop the waveform. And have some idea...
I am still interested in expanding on the initial comments on this thread.
We have also discovered Stellar makes a whole range of them for the application, but have no experience with the company.
They specifically list CS/CR 1ph 230V motors as the application for these starters.
What about...
...winding excitation power. UFRO is standard equipment. Stated motor starting of this model is 44 kW, and this is a code J motor, 7.99 multiplier * 5 HP = 40 kW demand to start at 35% voltage dip.
The only other significant loads here are two AHU air conditioners (2-3 tons each) plus plugs...
Been looking around for a product that meets specification to soft start a single phase fan motor.
5 HP, 3500 RPM, 230 V, 21A nominal, 60 Hz. Currently started DOL but would like to limit inrush to make it easier on standby generator. Current acceleration time is 2-3 seconds estimated.
This...
One day while overlooking the Golden Gate, I saw a large tanker pass under into the Bay. It was being closely followed dead center by a large tug that appeared to be doing not much of anything. I speculate it was there to take immediate action if things got out of hand?
I agree on stock price manipulation. Short term thinking. It can only go on so long until the chickens come home to roost. The owners (shareholders) certainly got soaked in this debacle.
As to the land management. Roughly 50% of the tinder that carried this fire (east of town) is owned by...
PG&E was not exactly "turned into" a public corporation. They kind of wrote the book on power transmission and generation from the very beginning of its existence. Back in the days when this was built, the government was not involved in the provision of power (or many services) at all. It was...
The continuous fuel from ignition to homes also plays into this incident.
It could have been a car fire, or someone shooting, or any number of sources that would have had the same result.
But there was an obvious cause of this one, whom everyone dislikes, and possibly an opportunity to further...
I have used the Collins connection on an old 10 lead 25 kw Japanese unit, and it worked for many years like that, until the machine wore out from age and use.
I saw a fellow do the same for a 6-71 Detroit set and he said it worked well.
I have not seen a 10 wire head on anything modern...
Bar-diamond/Collins connection also leaves 3 points at 120° separation and 208 volts (120 to neutral) so the AVR, if it is three phase sensing, need never know that the connection has been molested.
