# Shielded Conductor Examination

Please find the archived Conductor.doc file in the ActiveField\Conductor folder.

Time-Harmonic Magnetic problem of a shielded conductor is examined. Copper conductor with round cross-section 2 mm diameter is placed to the origin of coordinates. It carries electric current with variable frequency and amplitude, but as a default we will assume 50 Hz and total current 100 Amperes.

Cylindrical shield with internal radius 4 mm surrounds the conductor. We will analyze dependence of the electric field parameters from the shield thickness in the range 0.5 mm to 5.5 mm, and its material electrical conductivity and magnetic permeability.

We will also compare results for shield with short-circuited ends (zero voltage), open ends (zero total current) and without shield. To measure the field characteristics we will use the tester - steel rod with 1 mm radius. Distance between the centers of tester and conductor is 12 mm.

This sample demonstrate how to use QuickField calculation from within the Microsoft Word environment. Please find the Conductor.doc file and open it with MS Word 2000. While opening the document you will be asked by Word whether you want to enable macros in the Conductor.doc document. Please, choose Enable Macros to be able to run the embedded program.

If you do not see this question, probably your Word works with the security level that is not set to Medium. For more information about changing the security level with MS Word please refer to Microsoft Office 2000 Help, the topic "Protection from documents that might contain viruses".

The Conductor.doc is a self-descriptive document, so there is no need to say more about it there. Please open the document, read the introductory chapter, fill in the tables with geometrical and physical parameters, press the Solve button and observe the calculation results.

A final "bonus" chapter tell how to use Microsof Graph object model to obtain charts.

Caution: The macro script embedded in the document relies upon its structure. So, be careful if you decide to change the document in some way. Particularly, you should not change the number of rows and columns in the tables and the order that tables and figures appear in the document.