The electrical behaviour of polymer insulator under different weather conditions

This paper presents the behavior of 33kV polymer insulator under nominal voltage and impulse by means of lightning activities. The electrical performance of the insulator is translated to electric field under uniform weather conditions which comprises of air humidity and contamination. ANSYS Maxwell modeling software is used to simulate the structure of the polymer insulator based on the real existing insulator’s dimension. The trend of electric field increase is discussed in detail

Considering the effects of a RTV coating to improve electrical insulation against lightning

One of the factors that cause power outages on distribution lines is being struck by lightning. Cloud to ground lightning often affects overhead distribution lines and can occur with negative or positive polarities. It can affect the performance of insulators and cause power line failure. Furthermore, outdoor polymer insulators are exposed to extreme weathering and pollution, which can cause chemical changes in the material properties and further leads to material degradation. These can cause a reduction in the insulator withstand capabilities and may lead to flashover. This paper investigates the effects of a RTV (room temperature vulcanisation) coating on a 10 kV polymer insulator in order to improve the electrical insulation performance against a lightning impulse under clean and polluted conditions. The up and down test method was used to evaluate the withstand voltage capabilities of an RTV coated polymer insulator. For reference, the withstand voltage for a basic setting polymer insulator was measured for comparison

Partial discharge investigation on palm oil using needle – plane electrode configuration and electric field distribution using ANSYS Maxwell

The Partial Discharge Inception Voltage (PDIV) and PD characteristic of mineral oil were described and compared with palm oil. The test was performed by needle-plane electrode configurations. Both mineral- and palm oil were investigated under AC voltage. A comparison study between PDIV and PD activities of the mineral oil Hyrax and palm oil were investigated with the total volume of the oil in the test cell was approximately 2 L. The 50-μm tip radius of tungsten needle electrodes were utilized as high voltage electrode. On the other hand, the grounded electrode with 30-, 40-, and 50 mm gap distances was represented by a 50-mm and 75-mm diameter copper plane electrode. Consideration on the oil conditions' effect on both PDIV and PD characteristics was also carried out. It was clearly shown that PDIV is dependent on the electric field stress of the electrode system and the test method based on the experimental results. In comparison to differences of gap distance, the 50-μm needle tip radius and 75-mm plane with gap distance of 30-mm electrode revealed the highest electric field stress and inversely exhibited the lowest PDIV value tested. Furthermore, simulation using ANSYS Maxwell on the electric field distributions of the electrode systems was also performed. In order to quantify electric field based on the finite element methods the ANSYS Maxwell was being utilized. In the simulation, the palm oil and mineral oil properties of its 2D modelling test cell was used. From the results, the PD characteristics of mineral oil and palm oil tested by needle-plane electrode system are known. To confirm the suitability of palm oil as a high voltage insulating medium, it is vital to analyse in-depth on its partial discharge activity and characteristics

On the effect of insulator angle with respect to the cross arm on the distribution of lightning electric fields

In this paper, the effect of insulator angle with respect to the cross arm on the electrical performance of a polymer insulator under lightning impulse voltage condition was studied and the results discussed accordingly. An insulator angle with the cross arm of other than 90° is usually due to defects in the connections or being under pressure from the line angles and it can be an important issue for the stability of the line against lightning. The results show that the insulator angle can play an important role in increasing the electric fields around insulator and thus increase the chance of electrical breakdown of the insulator

Children’s diapers condition monitoring in childcare centre with display system

Leaving a babies/children diapers in a wet condition in long times will cause rash/irritation or other skin diseases. Sometimes, in babies/children care centre, the childcare workers cannot change the diapers often because they will not be noticed that the children diapers already wet. In this paper an online monitoring system for display the condition of the babies/children diapers condition in childcare center is presented. The Wi-Fi module is applied for communication system between the display system and the diaper sensors system. The DHT22 sensor is used for detecting the dampness of the diapers and also for sense the temperature and humidity in and around the diapers, while the sound sensor is used to detect the sound of baby crying. The monitoring system of the device develop able to display more than one diaper condition. The display system used the Blynk application on the user’s smart phone. Based on experiments conducted, the system successful to detect more than one diapers and displayed in one application with 85 % accuracy. The application can notify the users when the diapers are wet and or the babies/children are crying with 95 % accuracy

Program Pemberdayaan Desa (Studi Kasus Ued-sp Dharma Bakti Desa Gabung Makmur Kabupaten Siak)

Village Empowerment Program The program is aimed to review penangulangan Accelerate Poverty through Economic Empowerment UED-SP WITH provision Against Pemanfaat / or rural communities What do loans for a review of the business, Institutional Capacity and Empowerment AT village UED-SP. to review meujudkan Village Community Development The participatory and self-reliant. Of Research Singer substance is to determine the extent of development review UED-SP Dharma Bakti And The agency encourages empowerment hearts IN Village Community Economic businesses.Concept Theory The researchers use is empowerment Economic empowerment Institutional Capacity Productive And UED-SP Dharma Bakti. Methods used hearts singer research is qualitative descriptive WITH data collection instruments include Interview, Observation and Data Documents UED-SP Dharma Bakti.Research results show that the singer their taxable income through Empowerment Program Fund revolves UED-SP Dharma Bakti, the empowerment of society and Institutional capacity is increasing. ON refund arrears OR Loans Still experiencing congestion due to lack of training and mentoring Against USE Loan funds UED-SP Dharma Bakti. In addition to ITU, socioeconomic factors Pemanfaat The majority is Farmers, mostly oil, the price of palm fruit bunches (FFB) The fluaktif and social conditions laiinnya Opt Against Giving effect of economic business development Pemanfaat And Institutions UED-SP Dharma Bakti

Considering the effect of angle on polymer insulator performance under wet condition

This paper reviews a study of the inclination angle of an insulator due to mechanical forces imposed by overhead conductors. The angle theoretically shortens the effective leakage path and flashover distance of the insulator, thus change the electrical performance of the insulator. To take it into consideration, this study had focused on experimental works to investigate effect of insulator inclination to the breakdown voltage and leakage current. Regards to the important of wetness to improve surface conductivity of insulator surface, authors have considered to conduct the test in wet conditions. In addition, standard lightning voltage was applied according to IEC 60060 in both positive and negative impulses. Based on the test, the performance of an insulator under positive and negative impulses was compared accordingly. A significant reduction of breakdown voltage was recorded when the angle decreased. The reduction was recorded as high as 17 %. Meanwhile, the breakdown voltage was much higher under negative impulses compared to positive impulses which showed a difference of 12 % to 14 % and the leakage current increased by 17 % due to the inclination angle. The calculation of U50 with consideration of the reduction factor was suggested and briefly discussed

Effect of RTV coating material on electric field distribution and voltage profiles on polymer insulator under lightning impulse

Lightning has been known as one of major factors that cause power line failure in Malaysia. Presence of contaminants on polymer insulator surface will reduce voltage withstand capabilities in the event of lightning and could lead to insulator failure or worst power line disruptions. This paper presents a study on effects of Room Temperature Vulcanisation (RTV) coating material in order to improve electrical performances of polymer insulator and its effect towards electric field distribution and voltage profile. This study involves both experimental and simulation works. For experimental works, polymer insulator is tested inside fog chamber and voltage breakdown under lightning impulse were evaluated for clean and salt conditions. 3-Dimensional model of polymer insulator were simulated using ANSYS Maxwell and electric field distribution and voltage profile were evaluated. From the study, it shows that RTV coating material helps to improve voltage breakdown level of insulator and reduce concentration of electric field at triple region