Theoretical and technical problems of electromagnetic compatibility (EMC) in mining are covered in this volume. EMC is discussed in three main groups of problems: sources (generation) of interference, propagation of interference in mining conditions, the influence of interferences on mining devices, particularly electronic devices used in deep coal mines. Propagation of interference and its influence on mining communication and signalling systems as well as on control systems of mining machines are discussed. Attention is paid to the influences of interference on dispatching sytems which give to the dispatcher some information about mining hazards. The book will be of interest to mining and electrical engineers.

Table of Contents

Preface. 1. Introduction. 2. General Principles, Concepts and Terms. The technological environment - environmental protection. Hazards and interferences induced by the use of electric mining equipment. The electromagnetic field. Electromagnetic interferences - electromagnetic compatibility. The causes, nature and propagation of industrial electromagnetic interferences. General principles of electromagnetic interference measurement. 3. Electromagnetic Interactions due to Alternating Current Power Networks. Types and range of interaction. Theoretical principles of calculating the electromotive force of electromagnetic induction. Principles of calculating the included voltages in the auxiliary cores of mining power cables. Values of voltages induced in the pilot (auxiliary) cores of power cables and flexible mining cables. The influence of screens used in power cables and flexible mining cables. The influence of the operation of thyristor convertors on interference in high-voltage power networks. Examples of the results of measurements of electromagnetic interference in the underground low-voltage networks and their immediate vicinity. 4. Sources and Propagation of Electromagnetic Interference in Electric Traction Networks. Preliminary Remarks. Rectifier stations as sources of electromagnetic interference. Electric locomotives as a source of interference. Transmission of interference by contact lines. The storage-battery locomotive as a source of radio noise. The electric field of a contact wire in a heading. Examples of the electric interaction of a contact line. The mutual impedance of earth return circuits. The influence of rails on the mutual impedance of earth return circuits in headings. The magnetic interaction between a traction (contact) line and the earth return circuit. The magnetic interaction between a contact line and a symmetrical line. 5. Electromagnetic Interference in Mine


© 1993
Elsevier Science
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