Insulation measurement and supervision in live AC and DC unearthed systems /

Insulation measurement and supervision in live AC and DC unearthed systems /

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Bibliographic Details
Author / Creator:Olszowiec, Piotr, author.
Edition:Second edition.
Imprint:Cham : Springer Verlag, [2014]
©2014
Description:1 online resource (xi, [180] pages) : illustrations.
Language:English
Series:Lecture notes in electrical engineering, 1876-1100 ; volume 314
Lecture notes in electrical engineering ; v. 317.
Subject:
Electric insulators and insulation.
Electric power distribution.
Insulation (Heat)
Heat -- Transmission.
Electric insulators and insulation.
Electric power distribution.
Heat -- Transmission.
Insulation (Heat)
Format: E-Resource Book
URL for this record:http://pi.lib.uchicago.edu/1001/cat/bib/11085623
Hidden Bibliographic Details
ISBN:9783319070100
331907010X
3319070096
9783319070094
9783319070094
Notes:Includes bibliographical references.
Online resource; title from PDF title page (SpringerLink, viewed June 11, 2014).
Summary:Low voltage unearthed (IT) AC and DC systems are commonly applied for supply of power and control circuits in industry, transportation, medical objects etc. The main reasons for their use are high reliability and numerous advantages offered by isolating them against ground. Insulation level is a decisive factor for networks operational reliability and safety. Insufficient insulation-to-ground resistance can cause various disturbances. Though ground faults in IT systems do not make networks operation impossible, they may cause severe problems with their safe functioning. In this book the most important issues concerning normal operation and ground fault phenomena are described in concise form. Numerous methods of insulation resistance and capacitance measurement in live circuits are presented. Important other procedures of these parameters determination based on measurement and calculation are explained and reviews of selected insulation resistance measurement devices as well as earth fault locating systems are included. This book is addressed to electrical engineers, technicians and students and may also serve as an academic handbook. The extended second edition includes several innovative methods of insulation parameters determination as well as more detailed explanations of procedures and issues. Furthermore new important problems e.g. indirect methods of insulation resistance determination and insulation resistance monitoring in networks with frequency converters are addressed as well as examples of practical applications.
Other form:Printed edition: 9783319070094
Standard no.:10.1007/978-3-319-07010-0
Table of Contents:
  • Preface; Contents; Part I AC IT Systems; 1 General Characteristics; Abstract ; 1.1 AC IT Systems Circuit Diagrams; 1.2 Phase-to-Ground Voltages Determination in AC IT Systems; 1.2.1 Single-Phase Systems; 1.2.2 Three-Phase Systems; 1.3 Ground Fault and Leakage Currents Calculation; 1.3.1 Single-Phase Networks; 1.3.1.1 Steady-State Condition; 1.3.1.2 Transient Condition; 1.3.2 Three-Phase Networks; 1.3.2.1 Steady-State Condition; 1.3.2.2 Transient Condition; 1.3.2.3 Zero Sequence Current Calculation; 2 Ground Insulation Measurement in AC IT Systems; Abstract ; 2.1 General Information.
  • 2.1.1 Spatial Distribution of Insulation Resistance: Network's Insulation Equivalent Circuit2.2 Insulation Parameters Determination in Single-Phase Networks; 2.2.1 De-energized Networks; 2.2.1.1 Measurements with Megohmmeters; 2.2.1.2 Indirect Methods of Insulation Parameters Determination; 2.2.2 Live Networks; 2.3 Insulation Parameters Determination in Live Three-Phase Networks; 2.3.1 Insulation Equivalent Resistance and Capacitance Values Determination; 2.3.2 Insulation Resistance and Capacitance Determination for Single Phases; 2.3.2.1 Method of an Additional Single-Phase Voltage Source.
  • 2.3.2.2 Method of Two Phases Swapping2.3.2.3 Application of an Auxiliary AC Voltage Source with a Different Frequency; 2.4 Unconventional Measurement Methods; 2.4.1 Periodical Measurement of Insulation Parameters; 2.4.1.1 Insulation Resistance Measurement with Megohmmeters; 2.4.1.2 Measurement with Variable Elements; 2.4.2 Devices and Systems for Ground Fault, Earth Leakage and Shock Currents Measurement; 2.5 Influence of Insulation Parameters on Possible Ground Fault, Electric Shock and Ground Leakage Currents Levels; 2.5.1 Assessment of Ground Fault and Ground Leakage Currents.
  • 2.5.2 Assessment of Power Losses in Insulation2.5.3 Electric Shock Hazard Assessment; 2.6 Ground Fault Current Compensation; References; 3 Insulation Monitoring Systems; Abstract ; 3.1 Visual Signalization Systems; 3.2 Other Systems of Continuous Insulation Monitoring; 3.2.1 Phase Voltages Monitoring; 3.2.2 Zero-Sequence Voltage Component Monitoring; 3.2.3 Residual Current Monitoring; 3.2.4 Underimpedance System; 4 Systems of Insulation Resistance Continuous Measurement; Abstract ; 4.1 Measurement Circuits with Test Direct Current; 4.2 Measuring Circuits with Diode Rectifier.
  • 4.2.1 Star Connected Diode Rectifier4.2.2 Diode Bridge Rectifier; 4.2.3 Other Rectifier Based Measuring Circuits; 4.3 Measurement Method with an Auxiliary Rectangular Voltage Source; 4.3.1 Examples of Application; 4.4 Measurement with Use of Auxiliary AC Voltage; 4.4.1 Application Example; References; Part II DC IT Systems; 5 Equivalent Circuit Diagrams of DC Networks; Abstract ; 5.1 DC Network Simplified Circuit Diagram; 5.2 Equivalent Circuit Diagrams of Batteries; Reference; 6 Insulation Resistance Measurement Methods; Abstract.

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