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If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.
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TOPIC: Partial discharge testing of magnet wires

Partial discharge testing of magnet wires 2 years 7 months ago #716

This is my first time participating .
i have a few questions about magnet wire testing
1.any standards in IEEE for partial discharge testing?
2.Are any of the heavy AWG 30/31 wires used for oil immersed applications
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Re: Partial discharge testing of magnet wires 2 years 7 months ago #717

Hi there,

Since you are at a university in the United States we are a little bit surprised that you didn't contact IEEE directly re your question about possible IEEE partial discharge testing standards for magnet wire. Partial discharge testing of solid dielectric power cable is of course a standard and a run-of-the-mill testing procedure.

I personally am not a magnet wire technical specialist and thus unable to answer these very specific magnet wire questions but there are a couple of magnet wire experts who keep a fairly close watch on the WAI forums. Hopefully one of them will address your queries shortly.

Failing that we will fall back on our list of WAI magnet wire engineering members who don't mind volunterering some personal time to occasionally answer questions.

Kindest regards,

Peter Stewart-Hay P.E. (WAI Forums Moderator)
Stewart-Hay Associates
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Re: Partial discharge testing of magnet wires 2 years 7 months ago #718

Iam not familar with IEEE parial discharge testing. I do alot of work with precision ( thin film self bonding) magnetwire and never heard that term before.Can someone tell me what that is ?
I have heard of:
wet or dry dielectric testing
Continuity testing
Spark testing

For answer #2 Yes
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Re: Partial discharge testing of magnet wires 2 years 7 months ago #719

hi ,
thanks for taking the time out answer my question.Partial discharge is tetsing the wire for corona or surface discharges. these are visible discharges.
we have an equipment in our lab that does this
we test twisted wire samples.which simulates the condition of turn to turn insualtion.
i have been monitoring the partial discharges but not able to assess from the result obtained and find out between agreeable and unagreeable values.this is why i was looking for a standard.IEEE has none, and the ASTM is really expensive
hope this helps
once gain thanks for answering.
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Re: Partial discharge testing of magnet wires 2 years 7 months ago #720

Please see the following paper in the Furukawa Review:

"Development of a Magnet Wire with Superior Inverter Surge Resistance" by Ryousuke Obika, Tadashi Ishii, Yoshinori Tatematsu and Katsumi Osada.

The abstract of this paper is as follows:

"In recent years there is a trend for electrical equipment and industrial motors to be inverter controlled, as energy saving is promoted together with the downsizing and performance improvement of these equipment. While it has been suggested that excessive surges accompanied by inverter control adversely affect motor insulation systems, this does not make an exception for magnet wire. Thus magnet wires are required to have better resistance against inverter surges than before, because, when the wires are exposed to such voltages, degradation of the insulation layer is caused by corona discharge, unless sufficient insulation and creepage distance are provided between the wires. With respect to driving motors for electric vehicle (EV) and electric hybrid vehicle (EHV) also, similar phenomena are observable depending on the design of motors, thereby leading to a burgeoning demand for a magnet wire that is well adapted for inverter-controlled equipment.

To satisfy these demands, the authors have recently developed a new magnet wire with superior inverter surge resistance. Characteristics of this wire will be described in this report, whereby the life under high-frequency voltage has been improved significantly."

You can download a copy of this paper in PDF format.

Here is some more information from the LEESON Electric Corporation on their IRIS™ - Inverter Rated Insulation System:

Kindest regards,

Peter Stewart-Hay
Stewart-Hay Associates
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Re: Partial discharge testing of magnet wires 2 years 7 months ago #721

This test sounds like a typical dielectric test straight out of NEMA.
The NEMA Standards for magnet wire has minimum dielectric strengths for different awg wire and or single,heavy,triple builds of insulation.
Passing or improving the dielectric strength consists of degree of cure,concentricity of coating,type of insulation, and sometimes the surface quality of the conductor (IAm sure theres something I leaving out).
ie: We coat sizes close to 30awg and have absolutly no shorting or breaks in the insulation with more than 6500v ( very low amps)applied to them with only a .0004inch wall thickness of coating. (No pin holes either)

Thank you for the description of the IEEE partial discharge test.Hope whatever I said may help you atleast some.
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