Insulation Measurement and Supervision in Live AC and DC Unearthed Systems

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. For the text understanding merely basic knowledge of electrical circuits theory is required. This book is addressed to electrical engineers, technicians and students of this specialty and may also serve as an academic handbook.

Auteur

Piotr Olszowiec (M.Sc. electrical engineer, Poland), graduated from Academy of Mining and Metallurgy (Cracow), has worked over 30 years at Polaniec Power Plant (Poland). He is an owner of two patents relating to insulation resistance measurement in DC circuits. He is also an author of few papers on electrical protections and measurements and numerous articles on power engineering published in Polish technical periodicals. In 2011 COSiW (Poland) published his first book Insulation Monitoring in DC Networks (in Polish) based on gained professional experience. The manual Insulation Measurement and Supervision in Live AC and DC Unearthed Systems contains an updated overview of theoretical and practical knowledge about insulation monitoring issues.

Contenu

PART I.-AC IT SYSTEMS.-1. GENERAL CHARACTERISTICS.-2. GROUND INSULATION MEASUREMENT IN AC IT SYSTEMS.-3. INSULATION MONITORING SYSTEMS.-4. CONTINUOUS MEASUREMENT SYSTEMS OF INSULATION RESISTANCE

PART II.-DC IT SYSTEMS.-5. EQUIVALENT CIRCUIT DIAGRAMS OF DC NETWORKS.-6. INSULATION RESISTANCE MEASUREMENT METHODS.-

7. DEVICES AND SYSTEMS FOR INSULATION DETERIORATION ALARMING.-

8. MODERN METHODS OF CONTINUOUS INSULATION MONITORING.-9. EARTH FAULT, LEAKAGE AND ELECTRIC SHOCK CURRENTS IN DC IT SYSTEMS

PART III.-AC AND DC IT SYSTEMS.-10. EFFECTS OF AC AND DC IT SYSTEMS INSULATION FAILURES.-11. INSULATION MONITORS SETTINGS SELECTION.-12. AC/DC IT SYSTEMS.-13. EARTH FAULT LOCATION IN AC AND DC IT SYSTEMS. <