Characteristic of HV insulators’ leakage current on surface discharge

2015 ◽  
pp. 325-330
Keyword(s):  
Leakage Current ◽  
Surface Discharge

Partial Discharge Characterization based on Leakage Current Pulses Waveform for Contaminated Glass Insulator String

2016 ◽  
Vol 6 (2) ◽  
pp. 835
Author(s):  
N. A. Othman ◽  
M. A. M. Piah ◽  
Z. Adzis ◽  
Nasir A. Al-geelani
Keyword(s):  
Corona Discharge ◽  
Monitoring System ◽  
Leakage Current ◽  
Partial Discharge ◽  
Surface Discharge ◽  
Performance Tests ◽  
Current Pulses ◽  
Glass Insulator

This paper deals with the analysis of partial discharge (PD) occurrences based on leakage current (LC) pulses distribution under different level of contamination. In this work, laboratory based contamination performance tests are conducted on four units of glass insulator string stacked in I-position. Results show that PD can be characterized (according to their occurrence with respect to the AC supply) as follows: corona discharge occurring dominantly in lightly contaminated insulators, surface discharge occurring dominantly in medium contaminated insulators and finally internal discharge occurring dominantly in heavily contaminated insulators. The ability to distinguish the type of PDs from the LC waveform could be used to monitor and predict the condition of the insulator. The outcome can be incorporated in a conditioning monitoring system.

scholarly journals Simulation and Experimental Investigation on Carbonized Tracking Failure of EPDM/BN-Based Electrical Insulation

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 582 ◽  
Author(s):  
Muhammad Tariq Nazir ◽  
Faizan Tahir Butt ◽  
Bao Toan Phung ◽  
Guan Heng Yeoh ◽  
Ghulam Yasin ◽  
...  
Keyword(s):  
Leakage Current ◽  
Failure Time ◽  
Harmonic Component ◽  
Experimental Results ◽  
Shielding Effect ◽  
Surface Discharge ◽  
Melt Mixing ◽  
Electrical Field ◽  
Third Harmonic ◽  
Thermal Depolymerization

Ethylene propylene diene monomer (EPDM) is broadly employed as an insulating material for high voltage applications. Surface discharge-induced thermal depolymerization and carbon tracking adversely affect its performance. This work reports the electrical field modeling, carbon tracking lifetime, infrared thermal distribution, and leakage current development on EPDM-based insulation with the addition of nano-BN (boron nitride) contents. Melt mixing and compression molding techniques were used for the fabrication of nanocomposites. An electrical tracking resistance test was carried out as per IEC-60587. Simulation results show that contamination significantly distorted the electrical field distribution and induced dry band arcing. Experimental results indicate that electric field stress was noticed significantly higher at the intersection of insulation and edges of the area of contamination. Moreover, the field substantially intensified with the increasing voltage levels. Experimental results show improved carbonized tracking lifetime with the addition of nano-BN contents. Furthermore, surface temperature was reduced in the critical contamination flow path. The third harmonic component in the leakage current declined with the increase of the nano-BN contents. It is concluded that addition of nano-BN imparts a better tracking failure time, and this is attributed to better thermal conductivity and thermal stability, as well as an improved shielding effect to electrical discharges on the surface of nanocomposite insulators.

scholarly journals Partial Discharge Characterization based on Leakage Current Pulses Waveform for Contaminated Glass Insulator String

2016 ◽  
Vol 6 (2) ◽  
pp. 835
Author(s):  
N. A. Othman ◽  
M. A. M. Piah ◽  
Z. Adzis ◽  
Nasir A. Al-geelani
Keyword(s):  
Corona Discharge ◽  
Monitoring System ◽  
Leakage Current ◽  
Partial Discharge ◽  
Surface Discharge ◽  
Performance Tests ◽  
Current Pulses ◽  
Glass Insulator

This paper deals with the analysis of partial discharge (PD) occurrences based on leakage current (LC) pulses distribution under different level of contamination. In this work, laboratory based contamination performance tests are conducted on four units of glass insulator string stacked in I-position. Results show that PD can be characterized (according to their occurrence with respect to the AC supply) as follows: corona discharge occurring dominantly in lightly contaminated insulators, surface discharge occurring dominantly in medium contaminated insulators and finally internal discharge occurring dominantly in heavily contaminated insulators. The ability to distinguish the type of PDs from the LC waveform could be used to monitor and predict the condition of the insulator. The outcome can be incorporated in a conditioning monitoring system.

scholarly journals Research on Leakage Current Waveform Spectrum Characteristics of Artificial Pollution Porcelain Insulator

2021 ◽  
Vol 9 ◽  
Author(s):  
Chunhua Fang ◽  
Yuning Tao ◽  
Jianguo Wang ◽  
Haixin You ◽  
Yan Cui ◽  
...  
Keyword(s):  
Leakage Current ◽  
Phase Difference ◽  
Transmission Lines ◽  
Power Transmission ◽  
High Amplitude ◽  
Surface Discharge ◽  
Power Transmission Lines ◽  
Pollution Flashover ◽  
Development Processes ◽  
Porcelain Insulators

The surface discharge development processes of polluted porcelain insulators for power transmission lines are tightly related with the development of leakage current (LC), the characteristics of LC, the insulating condition, and discharge intensity of the insulator surface have an important significance for revealing the contamination discharge state of insulators. In order to analyze the LC characteristics of porcelain insulators in the process of pollution flashover, artificial pollution flashover tests on porcelain insulators were conducted in the artificial fog cabinet, and the characteristics of LC waveforms in time-domain and frequency-domain were simultaneously measured and analyzed during the tests. The results indicated that the amplitude of LC, fundamental harmonic, the third harmonic, and fifth harmonic had a strong correlation, the maximum of LC(Im), the rate of total harmonics (THD), and the phase difference of fundamental harmonic (θ) were used for the representation of the characteristics of the LC waveform. The LC has the characteristics of high amplitude, low proportion harmonic, and small phase difference between the fundamental harmonic and voltage before the flashover occurrence. The test results provide effective reference for porcelain insulators in pollution flashover forecasting.

scholarly journals Computer–Based Monitoring System for Analysing Surface Leakage Current in an IEC 587 Test Set–Up

2012 ◽  
Author(s):  
Md. Afendi Md. Piah ◽  
Ahmad Darus
Keyword(s):  
Monitoring System ◽  
Leakage Current ◽  
Surface Discharge ◽  
Test Set ◽  
Insulating Materials ◽  
Surface Leakage Current ◽  
On Line ◽  
Computer Based ◽  
Set Up ◽  
Surface Leakage

Surface discharge is a common electrical discharge that normally occurs on outdoor insulators under wet and contaminated conditions. The dry–band discharge exists because of the leakage current that flows on the insulator surface. Measuring the surface leakage current can identify the performance of insulating materials as well as the characteristics of discharges. A computer–based on–line monitoring of surface leakage current is found to be more practical due to the long period of time taken in conducting the laboratory test. This paper describes the design and development of a leakage current monitoring system associated with surface tracking and erosion resistance test set–up of IEC 587. The LabVIEW software package is used to develop a measurement program for recording and analysing leakage current signals. Experimental works have shown the capability of the developed system in detecting the performance of insulating materials as well as identifying the characteristics of the surface discharges. Besides the on–line monitoring function, a data storage feature is also added to the system to allow for further analysis. Key words: surface discharge; leakage current; signal analysis; virtual instrument program

scholarly journals Effect of humidity and contaminants on dry band formation in Outdoor Distribution Current Transformer 20 kV

2021 ◽  
Vol 1 (02) ◽  
pp. 84-89
Author(s):  
Satia Zaputra
Keyword(s):  
Leakage Current ◽  
Surface Resistance ◽  
Boundary Region ◽  
Current Transformer ◽  
High Conductivity ◽  
Surface Discharge ◽  
High Humidity ◽  
Band Formation ◽  
Current Curve ◽  
Solid Dielectrics

This study reports the effect of humidity and pollutants on the formation of dry band phenomena on the insulation surface of an outdoor 20 kV distribution current transformer. From the results of measurements at high humidity 95% and high conductivity 36 mS/cm at a working voltage of 2-20kV test there is a change in the curve of increasing the value of the leakage current which is very volatile. Wet layer of impurity will cause a drastic decrease in surface resistance resulting in a large increase in leakage current. At a high conductivity of 36 mS/cm, the results of the measurement of surface resistance at low humidity of 55% worth 30.2 giga ohms decreased to 2.1 giga ohms at high humidity of 95%. While the value of the leakage current curve is very fluctuating from the value of 206 - 678 A at high conductivity with heavy pollutants. This information confirms the hypothesis that the boundary region of the two air-solid dielectrics of the epoxy resin causes surface discharge problems in dry band formation due to an increase in the non-uniform local electric field in the impurity layer adhering to the surface of the distribution current transformer. Keywords : leakage current, dry band, surface discharge, contaminants

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