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Does the nuclear industry (especially in Japan) use robots for inspections in high radiation areas or to move radioactive material around? I, for some reason assumed that robotics could be involved to limit human interaction with radioactive material. Could they send something in to get a...

Google Elantis or Von Roll. They make complete lines of resins for all transformer/motor applications. They also have application notes regarding the general use of their products.

GadreP, Inrush will be approximately 10-12 times the FULL LOAD CURRENT for a standard transformer.

I have seen ceramics used in this application for both dielectric properties and heatsinking capability. If the ceramic substrate is metallized with copper/nickel on both sides it can be soldered to eliminate the epoxy problem. I don't have any exact details but I believe this method is...

I believe UL 489 is for circuit breakers.

Thanks for your prompt replies! The product of interest is for a 600V class, 100-300 kVA 3-phase inductor family. I don't think we will be using any plugs, but that reminds me that all components within our assembly should be UL listed @ jraef Does all testing typically take place at a UL...

My employer is interested in finding out how to get a component listed as UL & CSA 508 compliant. We are not familiar in any capacity with the requirements or process to achieve this type certification. We have some opportunities in the motor drive market but don't know what kind of issues...

Do you specify a shielding ratio? Some end-users like to filter out swtiching and other HF noise through a shield.

I completely agree the regulator might not have much life in it. If it only requires man-power and some resistors/wiring to be in working order we might have them in our stock room from vintage products (our company makes transformers as well as power supplies dating back to the 30's). I'm...

My main concern is that we will damage the regulator while replacing wires and resistive elements. The insulation is all cracked and some of the wires are even fraying. I don't even want to touch the reed switches. It sounds like it would be wise to clean everything up and stick with the...

Additional Photo's http://files.engineering.com/getfile.aspx?folder=9db616dd-970e-4408-882c-c2d4f72bf22f&file=IMG_0030.jpg http://files.engineering.com/getfile.aspx?folder=95b61070-de05-4da1-82a3-4f0ea94f6919&file=IMG_0026.jpg...

One of our guys found a 5 kva 480V/60Hz to 115V/400Hz generator in a loft and decided to energize it after at least 15 years. To our amazement it fired up and supplied voltage on the output. The motor is a Delco model B-612A, 7.5HP. The generator is a Bogue Electric Mfg. Co. Model 2082...

Pete, You're welcome. I also doubt I'll be trying to get my hands on them.

Here is a clip from the email I received this week. Hope it helps. Regards, Jim http://files.engineering.com/getfile.aspx?folder=75c7c94f-90eb-4b2e-9475-087de4c0ce02&file=IEEE_Ebook.jpg

We have had problems at our facility with thermocouples having bad readings in a high magnetic field. It was assumed that the magnetic field was inducing voltage into the sensor that swamped out the low level signal generated by the element. The sensor was placed next to the core gap of a...

Magnetic specialists, I'm curious if anyone has tried to simulate 3-phase transformer inrush in the Finite Element world. I'm currently learning to use the software on the fly and am finding there are a lot of tricks to be learned in order to see the simulation work (and make sense). If...

Are you running a DC load and trying to program a 300 Hz sinusoidal load (assuming 60 Hz) with it? You mention current generator, this test device is labeled as a load and will not source 300 Hz current. Can it only be programmed for constant power or constant resistance? That's the usual...

Sure, It is a delta primary with "teasers" to provide a phase shift on the primary for rectifier transformers. In my case, a 7.5 degree shift is obtained. A picture is worth a thousand words, so i have atatched one to look at...

I am interested in seeing differences in excitation current of a standard transformer (Delta or Wye primary)to that of an extended delta unit. Additionally I want to investigate any differences between a 3-leg transformer and a 5-legged unit under inrush and short circuit conditions. If...

A bifilar winding acts as a single conductor with increased cross sectional area. It doesn't affect the magnetic field in a special way. If you need bifilar windings of Litz wire in parallel to meet both AC and DC resistance, you can treat it as a single conductor. The same applies for...