Application of progressive methods of diagnostics of high voltage power equipment

2018 ◽  
Vol 8 (1) ◽  
pp. 92-101
Author(s):  
Sergey V. Pavlenko ◽  
◽  
Nikolay V. Silin ◽  
Nikolay I. Ignatyev ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Power Equipment

scholarly journals Machine learning as a tool of high-voltage electrical equipment lifecycle control enhancement

2020 ◽  
Vol 24 (5) ◽  
pp. 1093-1104
Author(s):  
Alexandra Khalyasmaa ◽  
Keyword(s):  
Machine Learning ◽  
Power System ◽  
High Voltage ◽  
Operation Mode ◽  
Electrical Equipment ◽  
Technical State ◽  
Power Equipment ◽  
System Operation ◽  
Power System Operation ◽  
Equipment State

The purpose of the study is to analyze the practical implementation of high-voltage electrical equipment technical state estimation subsystems as a part of solving the lifecycle management problem based on machine learning methods and taking into account the effect of the adjacent power system operation modes. To deal with the problem of power equipment technical state analysis, i.e. power equipment state pattern recognition, XGBoost based on gradient boosting decision tree algorithm is used. Its main advantages are the ability to process gapped data and efficient operation with tabular data for solving classification and regression problems. The author suggests the formation procedure of correct and sufficient initial database for high-voltage equipment state pattern recognition based on its technical diagnostic data and the algorithm for training and testing sets creation in order to improve the identification accuracy of power equipment actual state. The description and justification of the machine learning method and corresponding error metrics are also provided. Based on the actual states of power transformers and circuit breakers the sets of technical diagnostic parameters that have the greatest impact on the accuracy of state identification are formed. The effectiveness of using power systems operation parameters as additional features is also confirmed. It is determined that the consideration of operation parameters obtained by calculation as a part of the training set for high-voltage equipment technical state identification makes it possible to improve the tuning accuracy. The developed structure and approaches to power equipment technical state analysis supplemented by power system operation mode data and diagnostic results provide an information link between the tasks of technological and dispatch control. This allows us to consider the task of power system operation mode planning from the standpoint of power equipment technical state and identify the priorities in repair and maintenance to eliminate power network “bottlenecks”.

scholarly journals Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5901
Author(s):  
Yongjie Nie ◽  
Meng Zhang ◽  
Yuanwei Zhu ◽  
Yu Jing ◽  
Wenli Shi ◽  
...  
Keyword(s):  
Power Systems ◽  
Space Charge ◽  
Electric Fields ◽  
High Voltage ◽  
Vinylidene Fluoride ◽  
Power Equipment ◽  
Charge Accumulation ◽  
Charge Detection ◽  
Continuous Current ◽  
High Electric Fields

Power equipment operates under high voltages, inducing space charge accumulation on the surface of key insulating structures, which increases the risk of discharge/breakdown and the possibility of maintenance workers experiencing electric shock accidents. Hence, a visualized non-equipment space charge detection method is of great demand in the power industry. Typical electrochromic phenomenon is based on redox of the material, triggered by a voltage smaller than 5 V with a continuous current in μA~mA level, which is not applicable to high electric fields above 106 V/m with pA~nA operation current in power equipment. Until now, no naked-eye observation technique has been realized for space charge detection to ensure the operation of power systems as well as the safety of maintenance workers. In this work, a viologen/poly(vinylidene fluoride-co-hexafluoropropylene)(P(VDF–HFP)) composite is investigated from gel to insulating bulk configurations to achieve high-voltage electrical-insulating electrochromism. The results show that viologen/P(VDF–HFP) composite bulk can withstand high electric fields at the 107 V/m level, and its electrochromism is triggered by space charges. This electrochromism phenomenon can be visually extended by increasing viologen content towards 5 wt.% and shows a positive response to voltage amplitude and application duration. As viologen/P(VDF–HFP) composite bulk exhibits a typical electrical insulating performance, it could be attached to the surface of insulating structures or clamped between metal and insulating materials as a space charge accumulation indicator in high-voltage power equipment.

FIRE SAFETY OF MOTOR VEHICLES WITH HIGH VOLTAGE POWER EQUIPMENT AND ITS TRANSPORT INFRASTRUCTURE OBJECTS

2020 ◽  
Vol 4 ◽  
pp. 11-17
Author(s):  
Oleg DVOENKO ◽  
◽  
Ivan GUSEV ◽  
Andrei SHULPINOV ◽  
Viktor KUZMENKO ◽  
...  
Keyword(s):  
High Voltage ◽  
Fire Safety ◽  
Transport Infrastructure ◽  
Motor Vehicles ◽  
Power Equipment

scholarly journals Characteristics of Gel Time and Dielectric Strength of Epoxy Composite According to the Mixing Ratio of Micro-Fillers

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5165
Author(s):  
Dong-Hun Oh ◽  
Ho-Seung Kim ◽  
Jae-Hun Shim ◽  
Young-Ho Jeon ◽  
Da-Won Kang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Epoxy Resin ◽  
High Voltage ◽  
Epoxy Composite ◽  
Dielectric Strength ◽  
Epoxy Composites ◽  
Power Equipment ◽  
Mixing Ratio ◽  
Gel Time ◽  
Micro Fillers

The dielectric strength and gel time of epoxy composites vary with the mixing ratio of epoxy resin, hardener, additives, filler, etc., and especially the gel time affects the productivity and economics of ultra-high-voltage (UHV) equipment. However, previous studies focused only on the dielectric strength of epoxy composites for the reliability of UHV equipment. Therefore, a study considering both the dielectric strength and gel time of the epoxy composite is required. In this paper, the characteristics of the gel time and dielectric strength of the epoxy micro-composites according to the mixing ratio of silica (SiO2) and alumina (Al2O3) micro-fillers without changing the mixing ratio of epoxy resin and hardener are analyzed. Experimental results show that the gel time decreased and the dielectric strength increased as the mixing ratio of the SiO2 micro-filler increased. Therefore, it is concluded that the gel time can be controlled by changing the mixing ratio of micro-fillers without changing the mixing ratio of the epoxy resin and hardener. In addition, experimental data can be used as basic data for economical production considering both the reliability and productivity of UHV power equipment.

Sign in / Sign up

Export Citation Format

Share Document