FEATURE ARTICLE virtually no operating overhead and that requires no maintenance beyond simple inspection. FaultCurrent has provided extensive design explanations in its product literature. A cross-sectional view shows its three layers of coils and ferrite magnets. Basically, it is constructed as a three-phase 11kV device that comprises 8 dry insulated, copper windings for each of the three phases wrapped around ferrite magnets. There are 24 windings in total. The magnets are arranged in a patented octagonal fashion to comprise each phase. The three phases are then placed on top of each other. The copper windings can be connected in various series and parallel combinations providing flexibility for creating different variants. The overall dimensions of the unit are 3.5m x 3m x 3m. It weighs 57 tons in total, with the weight of the ceramic ferrite tiles accounting for 25 of the tons. It can act rapidly to increase its impedance in case of a fault, typically within less than 2 msec, and can also reset very quickly following clearance of the fault, taking less than a millisecond to do so. The device is protected by external cladding fitted with several louvers that allow for the natural ventilation and cooling. This is considered sufficient due to the dry type winding insulation using a combination of high temperature Polyimide and Glass Mica and the strategic distribution of the windings in its structure. The wind- 57 tons total View showing the wiring arrangements From Earth The Standard in Magnetic Measurements µMAG-01 Handheld Magnetometer * * * * * * * Single Axis 200,20 and 2µT Ranges 1 nT Resolution on 2µT Range +/-0.5% Accuracy 3 1/2 dig LCD Display Ambient Field Cancellation Analog Output MEDA.COM 8 RM100 Nanotesla Meter FVM400 Vector Magnetometer * * * * * * * * * * * ±200,000 nT Range ±0.01% Accuracy 0.1 nT Resolution RS232 & Ethernet Connectivity Ambient Field Cancellation LabView Driver SALES@MEDA.COM Magnetics Business & Technology * January/February 2020 703.996.8990 3-Axis ±100,000 nT Range ±0.25% Accuracy 1 nT Resolution RS232 Interface FAX: 703.996.8770 www.MagneticsMag.comhttp://www.MEDA.COM http://www.MagneticsMag.com