Partial discharge patterns in high voltage insulation (original) (raw)
Related papers
Detection of Partial Discharges and its Effect on Solid Insulation used in High Voltage Cable
— Most of the high voltage (HV) power equipment is made up with solid insulation like paper insulation, glass insulation, epoxy insulation etc. The oldest kind of insulating material among all insulation, the paper insulation is used in cable and nowadays the Cross linked Polyethylene (XLPE) is commonly used for cable insulation. The presence of impurities in the insulation system is one of the root causes of insulation failure as they are form a weak zone inside the healthy insulation system. Therefore, early identification of degradation process like formation of electrical tree structures inside such solid electrical insulation due to high voltage tress during its operating life is utmost requirement to prevent the electrical power equipment from a sudden and complete insulation failure. To study the growth mechanism of electrical tree structure inside the insulation with different applied high voltage a commonly used insulating material like XLPE insulation in HV power cable are consider for this present work. This work also describes the ageing process by conducting the partial discharge (PD) test on the same insulating materials. Finally, the effect of PD on insulation i.e., formation of electrical tree structure on solid insulation was observed by using Scanning Electron Microscope (SEM) and analyzed.
Partial discharge simulation under various applied voltage waveforms
2012 IEEE International Conference on Power and Energy, PECon 2012, 2012
In high voltage power equipment, partial discharge (PD) measurement is widely used in the performance assessment of an insulation system. However, from modelling of PD, a better understanding of the phenomenon may be attained. PD activity within a void in a solid dielectric insulation material is influenced by many factors. One of the factors is the applied voltage. Different types of the applied voltage yield in different PD patterns and the condition for breakdown of insulation to occur. In this work, PD activity under various types of the applied voltages has been studied. A finite element analysis (FEA) software was used to simulate PD occurrence within a void in a dielectric material. The applied voltages that were considered are AC sinusoidal, damped AC and impulse voltages. PD patterns were observed through phase resolved partial discharge (PRPD) patterns. The obtained result may improve an understanding on PD behaviour under different types of the applied voltage. It may also assist in insulation diagnostics and performance assessment of an insulation system.
Classification of Partial Discharge Detection Technique in High Voltage Power Component: A Review
International Journal of Integrated Engineering, 2019
In this study, a review on categorization of partial discharge (PD) detection technique is presented. The PD detection is important in order to monitor and diagnosis the insulation health on high voltage (HV) power component. PD at high voltage transformer occurs due to the unscheduled maintenance, aging of equipment, breakdown of insulation, gas bubbles in insulation liquid, manufacturing error and etc. In order to maintain constant and high as possible of the transformer performance, it is essential to control, detect and measure the PD phenomena. There are many methods have been developed based on point of observation; optical, chemical, acoustic and electrical. However, the different methods have their own advantages and disadvantages.
31st Electrical Insulation Conference, EIC 2013, 2013
Measurement of partial discharge (PD) in high voltage equipment is widely used in condition assessment and performance maintenance of the insulation system. One of the methods to evaluate PD data from condition monitoring activities is by analysing PD signals captured from the PD detection equipment. In high voltage power cable, PD pulses originated from defect sites within cable insulation can propagate along the insulation. A better understanding of PD pulse propagation along cable insulation can be attained through simulation work. Therefore, in this paper, the propagation of PD pulses within cable insulation was simulated using finite element analysis (FEA) software and its velocity of propagation was calculated. The result was compared with the theoretical value and simulation results using PSCAD software. The effect of cable insulation parameters on the PD pulse propagation was also studied through the FEA model; these include variation of the permittivity and conductivity of the insulation material. © 2013 IEEE. http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=06554201
Analysis of Waveform of Partial Discharge in Air Insulation Measured by RC Detector
Proceeding of the Electrical Engineering Computer Science and Informatics, 2018
This study discusses the measurement of Partial Discharge (PD) in air insulation. Partial Discharge Measurement is very important to know the condition of electrical equipment. The cause of partial discharge is not only old equipment, but also from setup errors and insulation problems. In this research partial discharge measurement was performed by using electrical methods. Electrical method use RC Detector. The modeling of partial discharge was done by using needle-plane electrode distant 1 cm in air insulation. Partial discharge measurement parameters include the measurement of Background Noise (BGN), Partial Discharge Inception Voltage (PDIV) and PD Waveform. The Partial Discharge measurement result show that Vpp of BGN ON is higher than Vpp of BGN OFF. The negative PDIV signal first appeared for the RC Detector at a voltage 3.55 KV and Positive PDIV at 4.01 KV. Negative and positive PD waveform for RC Detector at 5 KV, 5.5 KV, 6 KV, 6.5 KV and 7 KV respectively, it has been found that the fall time is greater than the rise time, and peak to peak voltage (Vpp) will be greater when the applied voltage is greater.
New attempts in automated partial discharge identification using pulse sequence analysis
2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials, 2009
Measuring partial discharge and interpreting its patterns has become a common tool to recognize the type of insulation defects of high voltage equipments. Using statistical features of phase dependent patterns have the most use in PD analysis now. However, these patterns contain less information of PD pulses sequence which is in close relation with defect type. Therefore, nowadays more research studies are conducted in utilizing pulse sequence analysis (PSA) in PD classification. In this literature, a new automated PD classifier based on PSA is introduced and its application is investigated using experimental works on artificial PD defects.
Influence of Voltage Waveforms on Partial Discharges Developed in Power Cable Insulation
2013
The reliability of the power cables strongly depends on the single or multiple stresses that could develop within their insulation system. The electric stresses as overvoltages, dips, harmonics and inter-harmonics contribute to a drastically reduction of the insulation lifetime, damaging the insulation of cables mainly through partial discharges (PD) and charge accumulation. This paper deals with the influence of different applied voltage waveforms on partial discharge activity within the insulating material of power cable. The PD activity was investigated under sinusoidal, DC-step and bipolar rectangular testing voltage waveforms at the frequency of 50 Hz and 0.1 Hz, applied to the micro-cavity embedded in cross-linked polyethylene. Using the step-up voltage test method, the characteristics of PD were assessed. The results show that the sinusoidal waveforms at 0.1 Hz generally provide the lowest partial discharge inception voltage (PDIV) values. The PDIV increases slightly with frequency.
A REVIEW OF STUDY AND PERFORMANCE OF PARTIAL DISCHARGE FOR DIFFERENT TYPE OF INSULATION MATERIALS
International Journal of Engineering Technologies and Management Research, 2018
The insulation should be high quality for power transmission and high voltage application, in this way we are studying about the various type of insulation material such as epoxy resin, vulcanized fibres and polyethylene which are having different capacitance value, the power transmission equipment’s has less efficiency due to degradation of insulation material. In this paper, we are studying the partial discharge for the different type of insulation materials.
Analysis of Phase Resolved Partial Discharge Patterns using Statistical Techniques
2016
Partial discharges (PDs) in high-voltage (HV) insulating systems originate from various local defects, which further results in degradation of insulation and reduction in life span of equipment. One of the most widely used representations is phase-resolved PD (PRPD) patterns. For reliable operation of HV equipment, it is important to observe statistical characteristics of PDs and identify the properties of defect to ultimately determine the type of the defect. In this work, we have obtained and analysed combined use of PRPD patterns (φ-q), (φ-n) and (n-q) using statistical parameters such as skewness and kurtosis for (φ-q) and (φ-n),and mean, standard deviation, variance, skewness and kurtosis for (n-q).
Analysis Of Partial Discharge Using Phase-Resolved (?-Q) And (?-N) Statistical Techniques
2013
Partial discharges (PDs) in high-voltage (HV) insulating systems originate from various local defects, which further results in degradation of insulation and reduction in life span of equipment. In order to ensure reliable and durable operation of HV equipment, it is vital to relate the observable statistical characteristics of PDs to the properties of the defect and ultimately to determine the type of the defect. In this work, we have obtained and analyzed phaseresolved discharge patterns using parameters such as skewness and kurtosis.