Design of Diagnosis System for Insulation Degradation by Using Neurofuzzy Model

2000 ◽  
Vol 4 (5) ◽  
pp. 368-372
Author(s):  
Yigon Kim ◽  
◽  
Yang Hee Jung ◽  
Yong Chul Bae
Keyword(s):  
Numerical Simulation ◽  
Early Warning ◽  
Partial Discharge ◽  
Data Acquisition System ◽  
Electrical Equipment ◽  
New Method ◽  
Insulation Aging ◽  
Insulation Degradation ◽  
On Line ◽  
Data Design

Insulation aging diagnosis provides early warning of electrical equipment defects that helps avoid loss from unexpected production line shutdown. Since relations of insulation aging and partial discharge dynamics are nonlinear, it is very difficult to provide early warning in electrical equipment. This paper suggests a new method for diagnosing insulation aging that measures partial discharge on-line from DAS(Data Acquisition System) and acquires 2D patterns from analyzing it using wavelets. Using this data, design of a neurofuzzy model that diagnoses electrical equipment is investigated. Validity of the new method is confirmed by numerical simulation.

Typical PD Type of GIS, Transformer, Switchgear and other Substation Equipment

2014 ◽  
Vol 1044-1045 ◽  
pp. 893-897
Author(s):  
Wei Dong Zhang ◽  
Qing Liu ◽  
Nan He ◽  
Jian Wen Wang
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Free Particle ◽  
Electrical Equipment ◽  
Surface Discharge ◽  
Spike Discharge ◽  
Insulation Degradation ◽  
Substation Equipment ◽  
Insulation Breakdown

Most high-voltage faults are caused by the insulation degradation of electrical equipment, while partial discharge is the main reason of insulation breakdown of electrical equipment. This paper introduces partial discharge types of GIS, transformer, switchgear and other substation equipment based on the study of partial discharge types and summarizes five types of partial discharge of substation equipment, namely: spike discharge, free particle discharge, insulation defects discharge, surface discharge and suspended click discharge.

On-Line UHF Monitoring System of Partial Discharge for Electrical Equipment

2013 ◽  
Vol 676 ◽  
pp. 306-311 ◽  
Author(s):  
Guo Jin Chen ◽  
Ming Xu ◽  
Ting Ting Liu ◽  
Jing Ni ◽  
Dong Xie ◽  
...  
Keyword(s):  
Detection System ◽  
Partial Discharge ◽  
Electrical Equipment ◽  
Operational Reliability ◽  
Detection Methods ◽  
Case Based Reasoning ◽  
Power Equipment ◽  
Fault Type ◽  
Accurate Judgment ◽  
On Line

The detection and fault identification of the partial discharge is the important aspect for the monitoring of the power equipment. For the lacks of the traditional detection methods, this paper analyzed the UHF signal characteristic parameters of the power equipment’s partial discharge, and developed the UHF detection system of the partial discharge. The A/D technology of the gain equalization and quantization in the different bands is studied, and the fault diagnosis strategy of the partial discharge based on the UHF and AE is proposed. On the premise to ensure the integrity of the partial discharge signals, the acquisition, amplification, analysis and storage of the partial discharge signal is realized. The case-based reasoning technology determines the fault type and fault degree of the partial discharge to make the accurate judgment for the operational state of the equipment and improve the intelligence level and the operational reliability for the state diagnosis of the power equipment.

scholarly journals Experimental Research on Relationship between UHF Partial Discharge Signals and Discharge Quantity in GIS

2018 ◽  
Vol 208 ◽  
pp. 01002 ◽  
Author(s):  
Tao Yang ◽  
Jianrong Wu ◽  
Guozhi Zhang ◽  
Liang Huang ◽  
Qiansu Lv ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Electrical Equipment ◽  
Difficult Problem ◽  
Coefficient Of Determination ◽  
Peak Voltage ◽  
Research Relationship ◽  
On Line ◽  
Quadratic Integral ◽  
The Relationship ◽  
Peak Value

Apparent discharge quantity is usually recognized as judgement standard for severity of partial discharge in the field of electrical equipment insulation diagnosis. In recent years, the ultra-high-frequency (UHF) method has been widely used due to its unique advantages on on-line monitoring and positioning, but the relationship between UHF partial discharge signals and discharge quantity is still a difficult problem of UHF method. In order to research relationship between UHF partial discharge signals and discharge quantity in GIS, a large number of experiments, based on four kinds of typical insulation defects in the GIS, are carried out. Degree of correlation, between parameters including UHF energy, quadratic integral, peak voltage, peak-to-peak value, wave area and discharge quantity, the square of discharge quantity, is studied based on coefficient of determination. The experimental results show there is linear relation between UHF signal energy and the square of discharge quantity with high related degree.

scholarly journals Measurement of PD in Operating Motors Fed by Voltage Source PWM Drives

2017 ◽  
Author(s):  
Howard G. Sedding ◽  
Ian Culbert ◽  
Shannon R. Campbell
Keyword(s):  
High Voltage ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Partial Discharge ◽  
Voltage Source ◽  
Stator Winding ◽  
Frequency Content ◽  
Variable Speed ◽  
Insulation Aging ◽  
On Line

<p>On-line partial discharge (PD)measurement is now widely applied to motors rated 6 kV and above that are fed from the 50/60 Hz power system. However, many motors are being powered from invertors which facilitate variable speed motors to improve process efficiencies. One of the most common drives now being used is of the voltage source, pulse width modulation (VS-PWM) type. Such drives generate high voltage spikes in the kV range with risetimes in the submicrosecond range. These high voltage spikes are a form of severe electrical interference which render the detection of PD (with magnitudes 1000 x smaller) difficult, due to the overlapping frequency content in PD and the spikes. Thus PD detection on VS-PWM has been a challenge, in spite of the serious insulation aging that such drives may cause. This paper will outline the challenges in measuring the stator winding PD in motors fed by VS-PWM drives and describe a measurement system that is often effective. Results from measurements obtained using this system will be presented.</p>

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