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A container into which a transformer is inserted for sealing and mounting in a resin.
Similar properties to steel laminations but having a magnetic circuit that is more suitable for higher frequencies. 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.
Varnishes & Solvents
Polyester Thermosetting Tape which is the standard in the industry for use in transformers. Usually is the first winding, but may be split in two or in rare cases be the final winding.
Used in situations where high temperatures would prevent use of normal insulations. Any variations of this will be specified. Thicknesses normally available range from 0.
Can also get Grade III. Usually nominated as a thickness —eg. An identifiable feature on a bobbin that is used as a DATUM for the orientation of terminations and windings, etc. This allows for a JUMBLE type winding that is always contained and insulated from the laminations by the bobbin walls.
There can also be electrical advantages to encapsulating. On winding sheets this will also include core type or any reference to the 6422 of magnetic circuit.
Page 25 – Catalogue
The actual insulation properties of this paper are not high. Tongue is one dimension of the interior rectangle, stack total thickness is the other. 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. Thickness of each is 0.
Varnishes & Solvents
Exiting self-leads for termination are twisted over themselves several times to isoel wire and prevent breakage. Also known as spaghetti. Most possible faults but not all will show up as a higher than expected current. Once heated to this temperature, the fuse becomes useless and the transformer must be replaced or rewound. Means tubular PVC or woven fibre placed around the winding wire for additional protection and insulation.
Any taps are shown at intermediate figures. Used as insulation mostly between windings and as an outer wrap.
Standard size of a lamination eg. A protective fuse wound-into or placed on top of a winding, usually the primary. Core made up of magnetic materials composed of oxides containing ferric ions as their main constituent. Usually used to cushion larger diameter wires where the pressure from these wires would normally damage and penetrate other types of insulation.
Refers to mylar sheet insulation inserted between the bobbin and laminations,to provide increased insulation, where: 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.
Lamination material arranged with appropriate insulation to vary and control the magnetic circuit of the transformer. TPL is the number of turns of wire including enamel insulation calculated to fit into one layer. Means connecting an internal winding wire, either to a PCB bobbin pin or to another more flexible lead that can safely exit the transformer. TAP An intermediate point in a winding brought out for termination. This strengthens the leadouts and protects against accidental access or damage to the higher voltage windings.
Electrical grade Insulating paper. Means filling the 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.
Winding wire having TWO layers of protective enamel coating higher electrical insulation. Grain Oriented steel which is typically 0. A walled former with a central hole sized to fit a specific lamination type and stack.
SHUNTS Lamination material arranged with appropriate insulation to vary and control the magnetic circuit of the transformer. A magnetic core consisting of a circular ring of iron powder, ferrite, steel or other material.
Other grades used include H50, etc. Each material give the core distinctly different magnetic properties.
Composite moulded construction of compressed ferrite granules. Sizes normally available are 0. Absorbent thin isoenl paper used normally to stabilise and separate the layers in small high voltage transformers. They are not necessarily connected together. Winding wire having only ONE layer of protective enamel winding coating lower electrical insulation.
Layer winding as opposed to jumble winding is done by using a manufactured former and winding successive layers in such a way that: Usually used to describe layer winding — but can be Useful isonell bobbin winding to estimate winding progress.
To seal a transformer in a coffin using epoxy or other resin.