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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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.The lumped element model of electric circuita#39;s insulation makes the simplifying assumption that its attributes (parameters) - resistance and capacitance - are concentrated into idealized elements i.e. resistors and capacitors ... According to the simplified network circuit diagram these elements are resistors Ra , Rb etc. and capacitors Ca , Cb etc. ... In de-energized single-phase AC IT systems insulation-to-ground equivalent resistance Ri can be easily measured with an megohmmeter.

Title:Insulation Measurement and Supervision in Live AC and DC Unearthed Systems
Author: Piotr Olszowiec
Publisher:Springer Science & Business Media - 2012-07-16

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