Abstract
Geometrical, physical, and electrical parameters have influences on the precision of printed circuit board Rogowski coils (PCBRCs). This paper outlined operating principles and properties of PCBRCs. Two kinds of positional sensitivities between current conductor and PCBRC are analyzed, and mathematical models and formulas for error computing are established and derived. The roles of some critical geometrical parameters are characterized and verified by experiment. These methods can be used to define structure parameters of PCBRC for precise current measurement applications.
Highlights
Rogowski coil (RC) is a kind of helical coil used for electric current measurement
Conclusions can be made that, for a printed circuit board Rogowski coils (PCBRCs) under ideal condition, its output voltage is proportional to the rate of change of measured current provided that M keeps constant, just like an ideal RC
Experimental results verified that critical structure parameters of PCBRCs have influences on the measurement accuracy, and positional errors met the previous error analyses
Summary
Rogowski coil (RC) is a kind of helical coil used for electric current measurement. Unlike other current transformers using an iron core as the former, the wire of RC is wound on a nonmagnetic core like bakelite, glass, plastic, or rubber and so on. (3) They have no direct electrical connection to the main circuit This provides galvanic insulation and produces no heating, allowing them to measure currents nonintrusively and safely. (4) They can be designed flexibly and lightweight, making a very useful contribution to the art of measuring currents under various circumstances, where high currents are involved These advantages are rapidly generating interest in various applications, namely, power quality monitoring, relay protection, power electronic converter monitoring, large magnitude AC current measuring, pulsed current measuring, and high frequency current measuring [1,2,3,4,5,6,7,8,9]. The operating principle of PCBRC is presented, and the error analyses under two different position conditions are performed
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