Tao Shiyang

A study on UHF partial discharge online monitoring system verification methods

With the purpose of performing field verification on 1100kv GIS UHF partial discharge sensors, the author utilized the steep pulse signal injection method and the transfer characteristic experimental method to perform this study. The results indicate that both of the methods have feasibility for UHF partial discharge internal sensor field verification, and have very high relevance. The study obtained the attenuation characteristics of UHF internal sensors with different GIS structures, and provides advice on how to optimize the field verification of UHF sensors.

An empirical study on the sensing characteristics of 1100kVGIS UHF online monitoring instruments

The paper establishes a defect simulation platform for multi-sensor 1100kVGIS, simulating four types of typical partial discharge defects within the GIS capsule and obtaining detection spectra of different types of defects as well as detection signal spectra of diversified position sensors. The attenuation characteristics of different position sensors were acquired under diversified voltage signals by utilizing steep pulse signal sources, as well as the relationship of equivalence between steep pulse injection signal amplitude and the discharge capacity of the discharge model, which provides a theoretical basis for field verification technology for a 1100kVGIS on-line monitoring system.

Condition evaluation of distribution equipment based on conjoint analysis

Conjoint analysis is a new evaluation method. It has many advantages, but it has been seldom applied in the field of power equipment condition evaluation. This paper applies conjoint analysis method in the condition evaluation of distribution equipment, and proposes corresponding solutions to the specific problems appeared in implementation process: by refining the rule of consistency check in conjoint analysis, an optimization model with the goal of minimizing the adjustment to the original scores without violating the logical consistency constraint has been built; in view of the problem that too few levels to do accurate evaluation, the concept of membership degree is introduced in the transition process of index scores to levels to improve the evaluation sensitivity to the minor changes of index, making the results more accurate; under the presume of making sure that survey cards have reasonable redundancy, the linear correlation cards are removed in orthogonal experiment to reduce the cards number to improve the efficiency of investigation. The example analysis results show that those proposed solutions are correct and effective.