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