The effect of coating on leakage current characteristic of coast field aged ceramic insulator

2017 ◽  
Author(s):  
Dini Fauziah ◽  
Heldi Alfiadi ◽  
Rachmawati ◽  
Suwamo
Keyword(s):  
Leakage Current ◽  
Current Characteristic ◽  
Ceramic Insulator

scholarly journals Studi Pola Arus Bocor Isolator Keramik Selama Waktu Pemakaian 24 Jam

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Dini Fauziah ◽  
Waluyo Waluyo ◽  
Ismail Muhammad Khaidir
Keyword(s):  
Ambient Temperature ◽  
Electric Power ◽  
Leakage Current ◽  
Distribution System ◽  
Power Transmission ◽  
Current Data ◽  
Electric Power System ◽  
Leakage Currents ◽  
Ceramic Insulator ◽  
Distribution System Reliability

ABSTRAK Isolator merupakan komponen yang penting dijaga keandalannya dalam sistem transmisi dan distribusi tenaga listrik. Isolator rentan mengalami kegagalan akibat lingkungan, karena terpapar langsung kondisi dimana isolator tersebut terpasang. Salah satu jenis isolator yang sering digunakan adalah bahan keramik, dimana memiliki kelebihan diantaranya kekuatan mekanik yang cukup handal. Namun kekurangan isolator jenis ini adalah sifat permukaannya yang hidrofilik, yaitu mudah menyerap air sehingga bila digunakan pada kelembaban tinggi cenderung memicu timbulnya arus bocor. Arus bocor merupakan parameter penting pada isolator karena sering menjadi penyebab kegagalan isolator. Untuk mengetahui seberapa besar pengaruh kondisi lingkungan terhadap arus bocor, dilakukan pengujian terhadap isolator keramik dalam waktu 24 jam. Data arus bocor diambil setiap 3 jam untuk melihat perubahannya berdasarkan perubahan kelembaban, dan suhu lingkungan. Hasilnya didapat bahwa semakin tinggi kelembaban udara, dan semakin rendah suhu lingkungan maka arus bocor semakin tinggi. Hasil penelitian ini dapat dijadikan acuan untuk mengantisipasi kegagalan isolator keramik akibat arus bocor sehingga keandalan sistem tenaga listrik dapat terjaga. Kata kunci: Isolator keramik, Lingkungan, Kelembaban, Suhu. ABSTRACT Isolator is an important component that must be maintained to keep electric power transmission and distribution system reliability. Isolators are susceptible to failure due to the environment, because they are directly exposed to conditions where the insulator installed. Ceramic insulator is one type of isolator that is often used, which has advantages including mechanical strength that is quite reliable. However, the lack of this type of isolator is its hydrophilic surface, which is easy to absorb water so that when used at high humidity tends to trigger a leakage current. Leakage current is an important parameter in an insulator because it can be a cause due to insulator failure. To find out how environmental conditions impact on leakage currents along day, a ceramic isolator is tested within 24 hours. Leakage current data is taken every 3 hours to see the changes based on changes in humidity, and ambient temperature. The result is the higher humidity of the air, and the lower ambient temperature, can make insulator leakage current rise up. The results of this study can be used as a reference to anticipate the failure of ceramic insulators due to leakage currents so that the reliability of the electric power system can be maintained. Keywords: ceramic insulator, environtment, humidity, temperature.

scholarly journals Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2440
Author(s):  
Xiangxin Li ◽  
Ming Zhou ◽  
Yazhou Luo ◽  
Gang Wang ◽  
Lin Jia
Keyword(s):  
Leakage Current ◽  
Discharge Characteristics ◽  
Fundamental Component ◽  
Ceramic Insulator ◽  
Flashover Voltage ◽  
Arc Shape ◽  
Surface Discharges ◽  
Ieee Standard ◽  
Ice Shedding ◽  
Indeterminate Variation

Considering the ice shedding phenomena on ice-covered outdoor insulators, this paper conducted the artificial experiments by using a five-unit suspension ceramic insulator string covered with wet-grown ice to investigate the effects of ice shedding on the icing discharge characteristics. According to IEEE Standard 1783/2009, the minimum flashover voltage (VMF), propagation of discharges to flashover and related leakage current (LC) were measured. It was found that VMF after ice shedding can be increased by about 17% as compared with that before ice shedding. The initiation and formation of discharge arcs across ice-free regions caused by ice shedding become difficult, showing an unstable propagating path, indeterminate arc shape and longer arc column. Although VMF under ice shedding conditions is higher than that without ice shedding, the fundamental component, and harmonics show lower amplitudes for the latter case. The ratios of harmonics to the fundamental are well in accordance with discharge characteristics during the flashover for which the ratios show a relatively stable varying tendency in the absence of ice shedding, but show changeable and indeterminate variation under ice shedding conditions. The obtained results are helpful to understand the icing state and its influence on surface discharges for preventing the icing flashovers.

Leakage Current Characteristic of Vertical GaN-Based Light Emitting Diodes with Passivation Structures

2007 ◽  
Vol 10 (11) ◽  
pp. H334 ◽  
Author(s):  
Sunjung Kim ◽  
Duk-Kyu Bae ◽  
Jeong-Hyeon Choi ◽  
Jun-Ho Jang ◽  
Jeong-Soo Lee
Keyword(s):  
Leakage Current ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Current Characteristic

Measurement and Analysis of the Leakage Current on the Surface of Polluted Suspension Ceramic Insulator

2011 ◽  
Vol 48-49 ◽  
pp. 668-674
Author(s):  
Yan Shi ◽  
Xing Liang Jiang ◽  
Qi Fa Wan ◽  
Xiong Wu ◽  
Tao Xu
Keyword(s):  
Relative Humidity ◽  
Leakage Current ◽  
Harmonic Distortion ◽  
Characteristic Parameter ◽  
Salt Deposit ◽  
Ceramic Insulator ◽  
Odd Order ◽  
Suspension Insulator ◽  
Measurement And Analysis ◽  
Harmonic Components

The artificial pollution tests are implemented on an IEC standard suspension insulator, and the leakage current waveforms and frequency characteristics were investigated under different equivalent salt deposit density ESDD and relative humidity. It was found that the peak values of the leakage current, the total harmonic distortion (THD) and the odd order harmonic components, e.g. 150 and 650Hz, were significantly correlated with the contamination condition of the insulator surfaces. Besides, a new characteristic parameter IMR，defined as the product of the peak values of leakage current by the ratio of the 3rd order harmonic components to the 13th order harmonic components, is introduced to evaluate the contamination condition on the insulator surface.

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