1st Edition

Power Supply Devices and Systems of Relay Protection

By Vladimir Gurevich Copyright 2014
    262 Pages 230 B/W Illustrations
    by CRC Press

    260 Pages 230 B/W Illustrations
    by CRC Press

    Power Supply Devices and Systems of Relay Protection brings relay protection and electrical power engineers a single, concentrated source of information on auxiliary power supply systems and devices. The book also tackles specific problems and solutions of relay protection power supply systems and devices, which are often not dealt with in the literature. The author, an experienced engineer with more than 100 patents, draws on his own experience to offer practical, tested advice to readers.

    A Guide to Relay Protection Power Supply for Engineers and Technicians

    The first chapter reviews the electronics and primary elements of the system, including transistors, thyristors, optocouplers, logic elements, and relays, and their principles of operation. This background gives staff who service relay protection power supply systems the necessary electronics knowledge to help them work more effectively with the equipment. The next chapters of the book then cover built-in digital protection relay power supplies, battery chargers, accumulator batteries, uninterruptible power supply, and characteristic features of auxiliary DC systems at substations and power plants. The final chapters discuss questions and problems that engineers and technicians may face. These include insulation problems, issues in auxiliary DC power supply such as voltage dips, and electromagnetic disturbances such as blackouts, spikes, and surges. The author also explains how to address them.

    Suitable for beginners and experienced engineers alike, the book is written for those who work with relay protection systems and with AC and DC auxiliary power systems in power plants and substations. It combines theory and practical recommendations to provide a valuable reference on power supply devices and systems.

    Basic Components
    Semiconducting Materials and p–n Junctions
    The Transistor’s Principle
    Some Types of Transistors
    Bipolar Transistor General Modes
    Transistor Devices in Switching Mode
    Electromagnetic Relays

    Secondary Power Supplies

    Comparative Characteristics of Linear and Switch-Mode Power Supplies
    Problems with Electrolytic Capacitors
    Conclusions and Recommendations

    Battery Chargers

    Purpose and Modes of Operation of Battery Chargers
    Arrangement and Principle of Operation of a Classical BC on Thyristors
    BCs with a Function of Discharging the Battery
    BCs with Two Rates of Output Voltage
    Principle of Action of BC with a High-Frequency Link
    Ferroresonant-Type BCs
    Autoreclosing of a BC
    A Problem of High Capacitance on BC Output Ports
    Arrangement of Alarm about Failure of Transformers in Control Unit of BC
    Problems of Electromagnetic Relays in BCs
    A Device to Monitor Proper Ventilator Functionality in Sites with Batteries

    Uninterruptable Power Supply

    Diversity of Uninterruptable Power Supplies
    Static Switch
    Group Powering of UPS
    A Problem of Energy Quality in Networks with UPS
    High-Voltage UPS Aggregate
    Additional Problems of the UPS
    Dynamic and Hybrid UPSs

    LeadAcid Accumulator Batteries

    Principle of Lead–Acid Accumulator Operation
    Effect of Electrode Sulfation on Accumulator Performance
    Classification of Lead–Acid Accumulators
    Types of Lead–Acid Accumulator Battery Plates
    Types of Electrolytes
    Dry-Charged Accumulator Batteries
    The Capacity of an Accumulator Battery
    Selection of an Accumulator Battery

    Systems for Supervision of Substation Battery Continuity

    Existing System for Supervision of Substation Battery Continuity
    Suggested Method for Supervision of Substation Battery Continuity
    Device for Supervision of Battery Circuit Based on Nonlinear Shunt
    Using a Standard Shunt as Current Sensor
    Using the Hall-Effect Sensor in Systems for Supervision of Battery Circuits
    Newest Developments and Prospects of Their Application

    Backup of Substation DC Auxiliary Power Systems

    Characteristics of Backup Layout with Diodes
    DPR Protection Device
    Automatic Reclosing Device for DCAPS

    Insulation Problems in Substation DC Auxiliary Power Supply

    Faulty Actuation of Relay Protection at Grounding of One of the Poles of Auxiliary DC Power Supply
    Insulation Problems in Substation DCAPS

    Voltage Disturbances in Auxiliary Power Supply

    Electromagnetic Disturbances in the Power Network
    Voltage Sags in AC Networks
    Problematic Action of the Powerful Contactors as Changeover from Main to Reserved Auxiliary AC Power Supply on Substations
    Problems in Auxiliary DC Power Supply
    Voltage Dips in Auxiliary Power Supply Substation Systems



    Vladimir I. Gurevich works at Israel Electric Corporation as an engineer specialist and head of a section of the Central Electric Laboratory. His past employment experience includes teacher, assistant professor, and associate professor at Kharkov Technical University, and chief engineer and director of Inventor, Ltd. He is the author of more than 150 professional papers and nine books and the holder of nearly 120 patents in the field of electrical engineering and power electronics. In 2006, he became an honorable professor with Kharkov Technical University. Since 2007, he has served as an expert with the TC-94 Committee of the International Electrotechnical Commission (IEC).

    Dr. Gurevich’s books include: