Field grading*

Field grading is a method used in high-voltage insulation systems to control electric field distribution and reduce local stress concentration. It is achieved by proper geometry, conductive or resistive layers, and capacitive grading elements.

Field grading is important for design of cable terminations, bushings, insulators, grading rings, stress cones.

In QuickField, field grading can be analysed using Electrostatics or AC Conduction.

References

Wikipedia: Corona ring
Wikipedia: High-voltage cable

QuickField examples

Condenser bushing field grading
Cable termination to oil filled bushing
Grading ring

^* We do not guarantee that articles in the section "Glossary" are full and exact, and may be used as a reference of any kind. In fact - they are not! These are just informal hints, letting the students and amateurs better understand what is the specific term about. Experts should not read it at all! However, we will appreciate all expert recommendations about improving and extending our glossary.