The artificial Earth satellite equipped with a charged shield is presented. Its orbit is osculating due to the Earth compression. The secular disturbances, caused by the 2-nd zonal harmonic of geopotential are taken into account. The satellite attitude motion under the action of disturbing moments of gravitational and Lorentz forces is investigated. The Earth magnetic field is taken in quadrupole approximation. The evolution of rotary motion of the satellite is studied on the basis of new differential equations constructed with the use of s-parameters. The basic characteristics of the secular evolution of the shielded satellite rotary motion are revealed.