| 摘要 |
The invention relates to electric engineering, in particular to devises for current measurement and may be used in protection, control and monitoring devices, in energetic and power installations (drives, industrial automation, power sources, consumer electronics, electricity generating and power distributing systems. The invention is based on principle of current distribution into at least two flows and measuring only one part of current via a special current transformer. The purpose of the invention is decreasing current measurement error. A current sensor comprises a current-carrying bus, a primary winding connected to the said bus wound to toroidal magnetic core having a secondary winding. The secondary winding is made as turns wound along perimeter of the toroidal magnetic core using an insulated conductor, the primary winding being wound using the insulated conductor, ends of which are fixed in parallel to the longitudinal axis. The said winding is wound by one pair of turns, every pair located in the same plane crossing the diameter of the toroidal magnetic core. The primary winding is wound so that meets the following condition:where i -serial number of a turnn – quantity of turns,-electromotive force generated by external electromagnetic field of i-th turnTo meet the above mentioned condition, the primary winding may be wound by one pair of turns located in the same plane crossing the axial line of the current-carrying bus. Herein, both turns of the pair or one turn of the pair with another turn being located near the toroidal magnet core both on one side of the current-carrying bus and on different sides. Turns of every pair are wound in such a way that electromotive force eof both turns of the pair has opposite direction and identical magnitudes. |
