Study on on-line monitoring of transformer winding deformation based on equivalent circuit equilibrium equation;

Based on the loop equations of transformer model, utilizing the unbalanced current in the delta windings to establish the relations among the three-phase loop equations, a winding unbalanced parameter loop equation under the normal operation is obtained.

One of the causes is that the imperfect balance loop in the hydraulic system causes the crawling when the hydraulic vat falls down.

Described in the present paper is the design and establishment of the mathe-matic model for a flexible gyro pulse width modulation balance loop.

Design of the hydraulic balance circuit for the roof protecting machine

Analysis and measures for vibration of balancing circuit;

According to the difference of the polarity between the sample partial discharge in the balancing circuit and the external discharge,through the logical judge the internal partial discharge can be tested in an environment with severe electromagnetic interference.

Discussion of potential function and equilibrium equation about problem of rock sample monaxial compress failure;

Establishment of equilibrium equation in force method;

Based on properties of the materials analyzed and the main reactions in high-temperature smelting process,a mathematical method was used to establish the oxidation-reduction equilibrium equation of lead button formation in fire assay.