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Layer winding as opposed ixonel jumble winding is done by using a manufactured former and winding successive layers in such a way that: Used in situations where high temperatures would prevent use of normal insulations. Exiting self-leads for termination are twisted over themselves several times to strengthen wire and prevent breakage.

A protective fuse wound-into or placed on top of a winding, usually the primary. Each material give the core distinctly different magnetic properties. Electrical grade Insulating paper. To seal a transformer in a coffin using epoxy isoneo other resin. Any variations of this will be specified.

Varnishes & Solvents

On winding sheets this will also include core type or any reference to the type of magnetic circuit. An identifiable feature on a bobbin that is used as a DATUM for the orientation of terminations and windings, etc. Means tubular PVC or woven 624 placed around the winding wire for additional protection and insulation.

SHUNTS Lamination material arranged with appropriate insulation to vary and control the magnetic circuit of the transformer. Grain Oriented steel which is typically 0.

Similar properties to steel laminations but having a magnetic circuit that is more suitable for higher frequencies. The actual insulation properties of ieonel paper are not high.

Any taps are shown at intermediate figures. Lamination material arranged with appropriate insulation to vary and control the magnetic circuit of the transformer. Polyester Thermosetting Tape which is the standard in the industry for use in transformers. Once heated to this temperature, the fuse becomes useless and isojel transformer must be replaced or rewound.


Most possible faults but not all will show up as a higher than expected current. Means isonle an internal winding wire, either to a PCB bobbin pin or to another more flexible lead that can safely exit the transformer. Refers to mylar sheet insulation inserted between the bobbin and laminations,to provide increased insulation, where: Thickness of each is 0.

Schenectady Air-Dry Varnish data sheet

This strengthens the leadouts and protects against accidental access or damage to the higher voltage windings. Composite moulded construction of compressed ferrite granules. TPL is the number of turns of wire including enamel insulation calculated to fit into one layer. Absorbent thin brown paper used normally to stabilise and separate the layers in small high voltage transformers. Winding wire having only ONE layer of protective enamel winding coating lower electrical insulation.

Used as insulation mostly between windings and as an outer wrap. To bring the leads up along the side of the bobbin, or up ON TOP through the slots, to be terminated on top of the winding with external leads and using woven sleeving. Tongue is one dimension of the interior rectangle, stack total thickness is the other. A magnetic core consisting of a circular ring of iron powder, ferrite, steel or other material. Usually used to describe layer winding — but can be Useful for bobbin winding to estimate winding progress.

Thicknesses normally available range from 0. Usually used to cushion larger diameter wires where the pressure from these wires would normally damage and penetrate other types of insulation. A layer of copper shim, generally the full-width of the bobbin, or a specified widthwound as ONE complete turn and insulated from the windings either side.


Also known as spaghetti. Core made up of magnetic materials composed of oxides containing ferric ions as their main constituent. Other grades used include H50, etc.

There can also be electrical advantages to encapsulating. A container into which a transformer is inserted for sealing and mounting in a resin. Usually nominated as a thickness —eg. This is usually done to provide the transformer with a weather or damp-proof seal or to provide both a form of mounting and security against movement or vibration. Sizes normally available are 0. TAP An intermediate point in a winding brought out for termination.

A walled former with a central hole sized to fit a specific lamination type and stack. Usually is the first winding, but may be split in two or in rare cases be the final winding.

Isonrl filling islnel specified bobbin side-slots usually high SIDE-SLOTS voltage or primary side with a thickened opaque mixture of epoxy resin after final assembly and varnishing. Standard size of a lamination eg. This allows for a JUMBLE type winding that is always contained and insulated from the laminations by the bobbin walls. They are not necessarily connected together. Can also get Grade III. Winding wire having TWO layers of protective enamel coating higher electrical insulation.