As an important part of power system, cable plays an extremely important role in power transmission and power security. With the development of on-line monitoring technology, power monitoring centers have been established one after another. Intelligent on-line monitoring of primary power equipment and conventional power equipment has been greatly developed and become a trend. However, cable monitoring data is increasingly huge, and on-line monitoring system is facing more and huger technical challenges. Based on this, this paper analyses the problems of existing state assessment methods and the application requirements of power cable, as well as the related technical advantages of big data platform. A state evaluation system based on Hadoop platform is proposed. The system architecture, sub-module structure, algorithm and algorithm implementation are introduced in detail. The problem of low efficiency and poor real-time performance of existing evaluation methods is solved.

The influence of the geometric parameters of trapezoidal labyrinth channel on the emitter discharge is investigated in this work. The dentate angle, the dentate spacing, the dentate height are studied among the geometric parameters of the labyrinth channel. The numerical simulations of water flow movement are   performed according to Cubic central composite design by using programs GAMBIT and FLUENT. Inlet emitter pressure is set up to be 0.5 bar. As a result, a mathematical model of emitter discharge as a first-order polynomial is obtained. The most important and positive influence on the emitter discharge has the increase of the dentate spacing,B followed by the negative main impact of the dentate height H. The dentate angle θ  in the observed interval has no significant effect on the emitter discharge. No simultaneous effect between the examined factors is observed. The obtained model can be used as a basis for a successful emitter design.

The influence of the geometric parameters of a trapezoidal labyrinth channel on the pressure losses along the labyrinth length is investigated in this work. The impact of the dentate height is studied at fixed values of the dentate angle and the dentate spacing. The numerical simulations of a water flow movement are   performed by using commercial codes GAMBIT and FLUENT.  The inlet pressure of the dripper is set up to be 0.5 bar. The objective of the work presented in this paper is to derive a mathematical model of pressure losses along the labyrinth length depending on the dentate height. As a result, the mathematical model of pressure losses is obtained as a second-order polynomial. Bi-objective optimization is performed by means of mean algebraic function of utility. The optimum value of the dentate height is defined at fixed values of the dentate angle and the dentate spacing. The derived model of the pressure losses and optimum value of the dentate height can be used as a basis for a more successful emitter design.