by on December 23, 2017
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As an extension of my previous inquiry into air-core chokes, I'm trying to determine the voltage insulation rating of Enameled Wire, without much luck. Few of the audio air-core choke manufacturers list that data, and none of the enameled wire manufacturers I've checked give it either.
How can I be sure that the insulation on enameled wire will not break down under a given voltage? Am I not looking in the right place for this rating? Am I looking at the wrong kind of enameled wire for high-voltage applications? Are we required to build chokes such that consecutive windings of enameled wire are close enough in voltage that the insulation rating of the wire doesn't matter?
Breakdown voltage depends on the thickness of the covering, which can be of 3 types: Grade 1, Grade 2 and Grade 3. Higher grades have thicker insulation and thus higher breakdown voltages.
The temperature class indicates the temperature of the wire where it has a 20,000 hour service life. At lower temperatures the service life of the wire is longer (about a factor 2 for every 10 °C lower temperature). Common temperature classes are 105° C, 130° C, 155° C, 180° C and 220° C."
The breakdown voltage depends mainly on the thickness of the insulation (see formula below), but also on the bare wire diameter, the application temperature of the coil and the type of enamel.
Xinyu enameled wire has been developed which gives at least an order of magnitude longer life than a conventional enamel. System tests, using this enamel in a form wound coil, have shown that the turn-to-turn capability of this enameled wire is superior to the capability of a reliable service-proven ground wall insulation.
Goal of www.xinyu-enameledwire.com is to provide customized solutions for the market and customers, whether it is a single enameled wire or raw materials integration, as long as the customer needs, we will do our best to do the best. For any customer advice and feedback, we will give patient and meticulous response and equal treatment. For any customer inquiries, we will give the most professional and most reasonable offer with fastest speed. We are grateful for the customer's complaint, because this is the driving force for our progress. We are never satisfied with the status quo, and be tireless on the road of innovation and pursuing professional knowledge. For any order of the customer, we will be completed on time by mass.