Electric Relays: Principles and Applications, 1st Edition (e-Book) book cover

Electric Relays

Principles and Applications, 1st Edition

By Vladimir Gurevich

CRC Press

704 pages | 1286 B/W Illus.

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Hardback: 9780849341885
pub: 2005-12-15
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pub: 2018-10-03
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Description

Electric relays pervade the electronics that dominate our world. They exist in many forms, fulfill many roles, and each have their own behavioral nuances and peculiarities. To date, there exists no comprehensive reference surveying the broad spectrum of electric relays, save one-Electric Relays: Principles and Applications. This ambitious work is not only unique in its scope, but also in its practical approach that focuses on the operational and functional aspects rather than on theory and mathematics.

Accomplished engineer Dr. Vladimir Gurevich builds the presentation from first principles, unfolding the concepts and constructions via discussion of their historical development from the earliest ideas to modern technologies. He uses a show-not-tell approach that employs nearly 1300 illustrations and reveals valuable insight based on his extensive experience in the field. The book begins with the basic principles of relay construction and the major functional parts, such as contact and magnetic systems. Then, it devotes individual chapters to the various types of relays. The author describes the principles of function and construction for each type as well as features of several relays belonging to a type that operate on different principles.

Remarkably thorough and uniquely practical, Electric Relays: Principles and Applications serves as the perfect introduction to the plethora of electric relays and offers a quick-reference guide for the experienced engineer.

Reviews

"Engineers, students, technicians who use relays in their work or want to learn how to use relays operate would find this an invaluable reference book that will be constantly used in their work."

– In IEEE Electrical Insulation Magazine, July/ August 2007, Vol. 23, No. 4

Table of Contents

HISTORY

Relays and Horses

From Oersted to Henry

Art Professor Samuel Morse

Edison's Relay

The First Industrial Relays

MAGNETIC SYSTEMS OF ELECTROMAGNETIC NEUTRAL RELAYS

Basic Components of Electromagnetic Relays

Hysteresis and Coercitive Force

Types of Magnetic Systems

Differences Between AC and DC Relays

Some Auxiliary Elements for Improving the Relay Operation

What Happens When a Relay is Energized

Windings of Relays: Types and Design Features

CONTACT SYSTEMS

Designs of Basic Types of Contacts

Silver, Gold, Platinum

Contacts with Two-Stage Commutation

What is the Purpose of ''Contact Pressure?''

Self-Cleaning Contacts

Self-Adjusting Contacts

When Power Does Not Equal Multiplication by Current and Voltage

Split Make-Before-Break. High-Frequency Contacts

Compensation for Shocks and Electro-Dynamic Forces in Contacts

Sparking Contacts and Their Control

High-Power Contact Systems

Mercury Displacement Relays

EXTERNAL DESIGN OF RELAYS

Environmental Impact on Relays

Wood and Cardboard: First Protection Shield for Relays

Is a Sealed Relay Always Better Than Open One?

Outlets, Terminal Sockets and ''Containers'' for Relays

Indicators of Operation and Test Buttons

Relays Which Do Not Look Like Relays at All

REED SWITCHES AND REED SWITCH RELAYS

Who invented the ''Reed Switch''?

Coruscation of Ideas and Constructions

High Power Reed Switches

Membrane Reed Switches

Mercury Reed Switches

High-Voltage Reed Switches

Reed Switches with Liquid Filling

Polarized and Memory Reed Switches

Reed Switch Relays

Mercury Reed Switch Relays

Winding-Free Relays

HIGH-VOLTAGE RELAYS

What is a ''High-Voltage Relay?''

Open Relays for High-Voltage Switching

Vacuum and Gas-Filled High-Voltage Low Power Relays

High Power Vacuum Relays and Contactors

High-Voltage Reed Relays

High-Voltage Interface Relays

ELECTRONIC RELAYS

Was it Thomas A. Edison Who Invented a Vacuum Light Lamp?

Lee De Forest Radio Valve: From its First Appearance Until Today

How a Vacuum Tube Works?

Relays with Vacuum Valves

Gas-Tubes with Relay Characteristics

Power Mercury Valves

Electron-Beam Switching Tubes

Semiconductor Relays

Optoelectronic Relays

Super-Power Electronic Relays

Hybrid Relays

TIME RELAYS

Electromagnetic Time-Delay Relays

Capacitor Time-Delay Relays

Relays with Clockwork

Pneumatic and Hydraulic Time-Delay Relays

Electronic Time-Delay Relays

Attachments to Standard Electromagnetic Relays

Microprocessor Based Time-Delay Relays

Accelerated (Forced) Relays

THERMAL RELAYS

Relays Based on a Bimetallic Thermal Element

Protective Thermal Relays

Automatic Circuit Breakers with Thermal Elements

Dilatometer Relays

Manometric Thermal Relays

Mercury Thermal Relays

Thermal Relays with Reed Switches

Semiconductor Thermal Elements and Thermal Relays

PROTECTIVE CURRENT AND VOLTAGE RELAYS

What are ''Protective Relays''

Current and Voltage Transformers

Instantaneous Current and Voltage Relays

Current Relays with an Independent ''Time-Delays'

Current Relays with Dependent Time-Delay

Harmonic and Voltage Restraint Relays

Pulse Current Relays

POWER AND POWER-DIRECTIONAL RELAYS

Induction-Type Relays

Characteristics of Power Direction Relays

Electro-Dynamic-Type Relays

Electronic Analogs of Power Direction Relays

DIFFERENTIAL RELAYS

Principles of Differential Protection

High-Impedance Differential Relays

Biased Differential Relays

Electromagnetic Percentage Differential Relays

Induction-Type Differential Relays

Harmonic Restraint Differential Relays

Pilot-Wire Differential Relays

DISTANCE RELAYS

Principles and Basic Characteristics of Distance Protection

System Swing

Principles of Distance Relays Construction

Why do Distance Relays Need ''Memory?''

Distance Relays with Higher Performance

Electronic Analogs of Impedance Relays

FREQUENCY RELAY

Why is it Necessary to Control Frequency in Electric Networks?

Charles Steinmetz: Inventor of the Frequency Relay

Induction Frequency Relays

Resonance Relays

Electronic Frequency Relays

MICROPROCESSOR-BASED RELAYS: PROSPECTS AND CHALLENGES

Is It a Relay at All?

Advantages of Microprocessor-Based ''Relays'

Disadvantages of Microprocessor-Based ''Relays''

Summing Up

SPECIAL RELAYS

Polarized Relays

Latching Relays

Sequence Relays

Rotary Relays

Moving-Coil Relays

Amplifier-Driven Relays

Magneto-Hydro-Dynamic Relays

Annunciator Target Relays

Flashing-Light Relays

Buchholz Relays

Safety Relays

Ground Fault Relays

Supervision Relays

Hydraulic-Magnetic Circuit Breakers

BASIC RELAY TERMS AND DEFINITIONS: GLOSSARY

REFERENCES

About the Series

Electrical and Computer Engineering

Learn more…

Subject Categories

BISAC Subject Codes/Headings:
TEC007000
TECHNOLOGY & ENGINEERING / Electrical
TEC008000
TECHNOLOGY & ENGINEERING / Electronics / General