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   Shields, Transformer

Electromagnetic shielding is the process of limiting the flow of electromagnetic fields between two locations, by separating them with a barrier made of conductive material. Typically it is applied to enclosures, separating electrical devices from the 'outside world', and to cables, separating wires from the environment the cable runs through. Electromagnetic shielding used to block radiofrequency electromagnetic radiation is also known as RF shielding.

The shielding can reduce the coupling of radio waves, visible light, electromagnetic fields and electrostatic fields, though not static magnetic fields. (A conductive enclosure used to block electrostatic fields is also known as a Faraday cage.) The amount of reduction depends very much upon the material used, its thickness, and the frequency of the fields of interest.



Bronze Partners
Ad-Vance Magnetics, Inc.
Allied Components International
Alpha-Core, Inc.
Amuneal Manufacturing Corp.
Atlee Inc.
Ben Mer Manufacturing, Inc.
Eagle Magnetic Company, Inc.
Hudson Tool & Die Company
Magnetic Radiation Laboratories
Magnetic Shield Corp.
Metex Corporation
Mingstar Electronic Corp.
Omega Shielding Products, Inc.
Precision Electronics
Tapecon, Inc.
Tapecon, Inc.
The MuShield Company Inc.
Ventronics, Inc.
West Coast Magnetics
Fix & Prog. Sinewave Oscillators - Frequency Devices

 

Books
Practical Transformer Handbook: for Electronics, Radio and Communications Engineers
Irving Gottlieb

Excerpt - page 17: "... upon itself, but contains a gap. To be effective, the shield usually needs to be grounded and a terminal is often provided for this purpose. In some transformers, the shield is internally connected to the core. At radio ..."
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Handbook of Transformer Design and Applications
William M. Flanagan

Excerpt - page 40: "... ground, is usually increased by the use of an electrostatic shield. Transformers are notorious avenues for introducing noise on power lines. The ..."
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Electric Power Transformer Engineering
James H. Harlow

Excerpt - page 13: "... Conditions terphase Arindam Maitra Transformers Anish Gaikwad 2.5 Dry-Type Transformers ............................................... 2-102 Arshad Mansoor Transformer Taps oling Classes for ..."
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Electronics For Dummies
Gordon McComb and Earl Boysen

Excerpt - page 38: "... I: Getting Started in Electronics Figure 2-2: A plug-in wall transformer shields you from exposed AC household current. Sometimes, you need to ..."
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Critical Infrastructure Protection in Homeland Security: Defending a Networked Nation
Ted G. Lewis

Excerpt - page 277: "... stall physical security at key generators. rden or shield transformer substations. view SCADA and other control system cyber-security policies ..."
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Electric Power Substations Engineering
John D. McDonald

Excerpt - page 12: "... 2-6 FIGURE 2.5 Voltage transformers for GIS. SHIELD CONTAC' HOLDER HV CONI INSULATOR- SHIELD FIGURE 2.6 Disconnect switches ..."
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CET Study Guide
Joseph A. Risse

Excerpt - page 25: "... in phase. The broken line between the windings in the transformer of Fig. 2-7 represents a Faraday Shield. The transformer windings are made of metal (most are wound ..."
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Low-Noise Electronic System Design
C. D. Motchenbacher and J. A. Connelly

Excerpt - page 307: "... ground loops. This can be done with a shielded power transformer containing interwinding Faraday electrostatic shields built by Topaz and other transformer companies, as was discussed ..."
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Grounding and Shielding Techniques
Ralph Morrison

Excerpt - page 82: "... frequency and can cause higher currents to flow in the transformer capacitances. These sources include harmonic ... what can be done to shield the transformer in Figure 5.6 to limit or control this ..."
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TV Guide: TV on DVD 2006: The Ultimate Resource to Television Programs on DVD (TV Guide: TV on DVD)
Editors of TV Guide

Excerpt - Index: "... in the 25th Century Goggins, Walton Germain, Tabitha St. The Shield Transformers Armada Goldberg, Whoopi Germano, Greg The Magical Legend of the ..."
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Sound Reinforcement Handbook
Gary D. Davis and Ralph Jones

Excerpt - page 183: "... 11.10.1 The Splitter Transformer The main purpose of a splitter transformer is to isolate the shield grounds between two portions of a sound system. By using ..."
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The Basement Bugger's Bible : The Professional's Guide to
Shifty Bugman

Excerpt - page 182: "... high-gain mode) Such tremendous gain is tricky to stabilize without transformer isolation. Use a metal box, of course, to shield the transformers and keep out RE Twist input/output leads, and ..."
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Complete Wireless Design
Cotter W. Sayre

Excerpt - Back Matter: "... intersymbol interference (ISI), white noise, spurs, frequency offsets, etc. Faraday shield An electrostatic metallic shield located between the primary and secondary of an RF air-core transformer. This shield significantly decreases the capacitance that occurs between any ..."
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RF/Microwave Interaction with Biological Tissues (Wiley Series in Microwave and Optical Engineering)
André Vander Vorst, Arye Rosen, and Youji Kotsuka

Excerpt - page 41: "... near the surface of a conducting material. This is a shield- ing effect: At a depth ... to try to shield a transformer with a copper plate: A plate 5cm thick would be ..."
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EMI Troubleshooting Techniques
Michel Mardiguian

Excerpt - page 177: "... isolation, another technique is used, as described next. 8.2 Faraday-Shielded Transformers In a Faraday-shield transformer, an isolated aluminum or copper foil is wrapped between ..."
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Producing Great Sound for Digital Video
Jay Rose

Excerpt - page 62: "... Tip Signal Pin 3 Ring (no connection)"` Pin 1 Sleeve Shield Shield Some transformer-balanced outputs won't work unless you connect pin 3 to the ..."
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Practical Recording Techniques, Fourth Edition: The step-by-step approach to professional audio recording
Bruce Bartlett and Jenny Bartlett

Excerpt - Back Matter: "... Tip/2 SHIELDED CABLE HI 1K SLEEVE TIP Ring/3 0 Sleeve/1 SHIELD SHIELD 1K TO TRANSFORMER-BALANCED DEVICE OUTPUT 2-CONDUCTOR Tip/2 SHIELDED CABLE HI 4.7K SLEEVE TIP ..."
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The Fields of Electronics: Understanding Electronics Using Basic Physics
Ralph Morrison

Excerpt - page 68: "... path designed to trip a breaker. For this reason, single shields in power transformers for electronic hardware should always be connected to equipment ground ..."
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Electronic Instrument Design: Architecting for the Life Cycle
Kim R. Fowler

Excerpt - page 348: "... by common-mode current can be eliminated by using an electrostatic shield in the transformer, selecting an appropriate chassis ground connection, and balancing impedances in ..."
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Phase-Locking in High-Performance Systems: From Devices to Architectures
Behzad Razavi

Excerpt - page 121: "... serious drawbacks with this approach is that the solid ground shield also disturbs the inductor's magnetic ... the ground shield as a transformer. In Fig. 4, the primary and secondary circuits represent the ..."
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Boatowner's Illustrated Handbook of Wiring
Charlie Wing

Excerpt - page 205: "... neutral (white) and grounding (green) conductors are connected at the transformer, since the transformer secondary is ... the following pages, connections between shield, conductor, transformer case, shore-power ground, and ship's ground vary with ..."
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Solving Interference Problems in Electronics
Ralph Morrison

Excerpt - page 40: "... It is easy to violate the shielding provided in a transformer. The primary leads must not be brought near the secondary leads unless these leads are inside of their own protecting shield. This procedure raises product cost, so the best way to ..."
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Biomedical Instrumentation: Technology and Applications
R. S. Khandpur

Excerpt - page 418: "... instruments have three grounds: (i) The chasis and the electrostatic shield in the power transformer are connected to the earth ground through the third wire ..."
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Op Amp Applications Handbook (Analog Devices Series)
Walt Jung

Excerpt - page 488: "... 1, a transformer like the L1,1582, but without a Faraday shield. The two transformers are very similar, but the LL1582 is recommended for single-ended ..."
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Computational Electromagnetics (Texts in Applied Mathematics)
Anders Bondeson, Thomas Rylander, and Par Ingelström

Excerpt - page 2: "... established for the analysis and design of electrical machines. generators, transformers. and shields. In applications to microwaves, GEM is a more recent tool, ..."
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Old Time Radios! Restoration and Repair
Joseph J. Carr

Excerpt - page 212: "... problem can usually be diagnosed by light tapping on the shield can of the transformer, or by using a signal tracer or signal generator to ..."
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Emc & the Printed Circuit Board: Design, Theory, & Layout Made Simple
Mark I. Montrose

Excerpt - page 27: "... I IZI Figure 2.2 Characteristics of ferrite material. Frequency 2.1.5 Transformers Transformers are generally found in ... application of the transformer, a shield may be provided between the primary and secondary windings. This ..."
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Power Electronics Design : A Practitioner's Guide
Keith H. Sueker

Excerpt - page 58: "... will provide the best protection from common-mode voltages if a shield is not used. An electrostatic shield (Faraday screen) is a relatively low- cost addition to a transformer, and it is a good practice to specify a shield ..."
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The Hammond Organ: Beauty in the B (Keyboard Musician's Library)
Mark Vail

Excerpt - page 126: "... is a simple one. There is a metal can that shields the matching transformers of the C-3, B-3, M-3, etc. It has two shielded ..."
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High Voltage Engineering & Testing (Iee Power & Energy Series, 32)
Hugh M. Ryan

Excerpt - page 412: "... ange Q5 Bushing head ntral tube 07 Corona shield >Transformer turret Figure 12.7 Section of typical transformer bushing JI specific ..."
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Inventions, Researches and Writings of Nikola Tesla
Thomas Commerford Martin

Excerpt - page 113: "... of magnetic shielding of parts to the construction also of transformers, the shield being interposed between the primary and secondary coils. In trans- ..."
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Demystifying Switching Power Supplies (Demystifying Technology)
Raymond A. Mack

Excerpt - page 266: "... Demystifying Switching Power Supplies affect the magnetic operation of the transformer. The Faraday shield is not always necessary if the EMI filtering is adequate. ..."
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Engineering Electromagnetic Compatibility: Principles, Measurements, Technologies, and Computer Models
W. Prasad Kodali

Excerpt - page 291: "... Section 11.5  Isolation Transformers Shields ------ ------ ~~---------------- DM . ... Metal casing Figure 11.14 Isolation transformers: (a) double shield, (b) triple shieh (b) ~` Common-mode * ..."
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The Electronic Packaging Handbook
Glenn R. Blackwell

Excerpt - page 176: "... transient event. Depending on the type and application of the transformer, a shield may be provided between primary and secondary windings. This shield, ..."
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Zzaap!: Training Esd, Fri, and EMI
Corp, M. Bruce, and M. Bruce Corp

Excerpt - page 44: "... common-mode noise to the less desirable transverse variety in a transformer results from the way the ... operation. The solution is to shield the transformer to shunt the unwanted current off to ground ..."
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Electromagnetic Compatibility in Medical Equipment
William D. Kimmel and Daryl Gerke

Excerpt - page 132: "... or by isolating the hea t sink. Capacitive coupling to transformer is avoided by a Faraday shield in the transformer. Inductive coupling is minimized by eliminating the ..."
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