Method for production of dielectric insulation layers upon electrical conductors

摘要

Monitoring of the quantity of magnetically permeable particles in a dry dielectric carrier layer surrounding a conductor by passing the conductor with its surrounding layer through a magnetic field created by a magnet to cause magnetic attraction between the particles and the magnet. The degree of this attraction is dependent partly upon the quantity of particles lying in the field and the degree of movement towards each other of the conductor and magnet is monitored while resisting this movement, to give an indication of the particle quantity. A method of controlling the quantity of particles is also described and which uses the monitored movement to produce signals by which the input of particles or carrier into a fluid mixture is adjusted.