Research and application of phase-sensitive protection in load control center
Abstract：According to the field requirements, the electrical characteristics between motor starting and three phase short-circuit were compared, the phase-sensitive protection circuit based on the synthesis of power factor and current amplitude was designed, the protection data was tested and the protection characteristic was analyzed. The phase-sensitive protection circuit was uesd in K3Z-4000-10 （6）/3.3 flameproof and intrinsically safe load control center. The circuit can effectively distinguish motor starting current and three-phase short-circuit current and is stable, sensitive and reliable. It is proved that the short-circuit protection of power in underground is reliably realized.
Keywords：phase-sensitive protectionload controlshort-circuit faultmechanized working face
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1056-1060 )