• 전기학회논문지
• /
• 제61권10호
• /
• pp.1461-1470
• /
• 2012

This paper reports the contamination performance of transmission line porcelain insulators tested under five different contaminant conditions - clean and ESDD (equivalent salt deposit density) level (A, B, C, and D) through measurement of their leakage current under drop of potential method. To estimate the contamination for transmission line porcelain insulators, leakage current waveform and its maximum value were measured under step-up power test. In the clean insulators test, % distortion factors decreased with increasing step-up power, and as the ESDD level increased, some characteristics such as frequency analysis, harmonics and % distortion facotor could be used for contamination diagnosis of the transmission line porcelain insulators.

• 전기학회논문지
• /
• 제61권9호
• /
• pp.1306-1313
• /
• 2012

This paper reports the contamination performance of two distribution arresters (new and used ones) tested under three different contaminant conditions - clean fog, ESDD (equivalent salt deposit density) level (A, B, C, and D), and kaolin contamination conditions, and their leakage current, total leakage current, and component of the resistive leakage current were measured in order to diagnose arrester deterioration. The 3rd harmonics was larger than 5th and 7th ones for the arrester under the clean fog, and as the ESDD contamination level was applied, 5th one became relatively larger than 3rd one. Therefore, these results indicated that the resistive leakage current could be used for the diagnosis of the arresters.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 일렉트렛트 및 응용기술
• /
• pp.189-193
• /
• 2002

Outage caused by contaminated insulator on high voltage transmission line and in substation is major concern for utility world-wide. To prevent these outages, it is necessary to develop an automatic salt contamination detecting device which provide the information about contamination level on utility for engineer to meet the emergency in advance. For that purpose, we have been developing an automatic salt contamination detecting device to monitor a salt amount on operating power utility area. In the salt contamination detecting device development, the most important thing is the sensor which can detect a salt amount and the understanding of sensor' s detecting principle. This paper describes the operating principle of the sensor and the experimental results about the detecting of salt amount. The results of this experiment wi1l be useful for detecting the contamination level.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 하계학술대회 논문집 C
• /
• pp.1832-1834
• /
• 2004

The degree of contamination on outdoor insulator is one of the most importance factors to determine the pollution level of outdoor insulations, and the sea salt is known as the most dangerous pollutant. As shown through the preceding study, the generation of salt pollutant and the pollution degree of outdoor insulator have a close relation with meteorological conditions, such as wind velocity, rainfall, and so on. So, in this paper, we have made database using the past meteorological data and ESDD(equivalent salt deposit density) and then we predicted the pollution degree in the future after analyzing currently meteorological data of database.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 C
• /
• pp.1903-1905
• /
• 2002

The degree of contamination on outdoor insulator is one of the most important factors for the determination of insulation level. And the salt, NaCl, is known as the most dangerous contaminants in the most region of the world. As shown through the preceding study, we could find the close relationship between the generation and deposition of salt contaminants and the meteorological conditions. To analyze the relationship, we monthly measured the ESDD for some sites with brush wiping method, and daily measured the density for one site with the automatic measuring apparatus. And, with the measured data and the meteorological data from KMA(Korea Meteorological Administration), we analyzed the relationship between the two factors with regression method. Through the results of this investigation, we could quantify the comparative contribution of the climatic factors for the pollution level of outdoor insulator, and the results could be used as a useful reference for the maintenance of overhead lines and substations.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 A
• /
• pp.262-264
• /
• 2002

This paper shows the design standard of KEPCO on the contamination design for 345 kV and 154 kV transmission tower. Up to now, because the design standard of KEPCO on the insulation design contains 154 kV transmission system only, we had investigated the 343 kV system for the revision of design standard, with respect to the contamination design, we have used the same design philosophy which were adopted to the 765 kV transmission tower. In order to determine the number of insulator discs, we had investigated the withstand voltage of discs according to the level of ESDD(Equivalent Salt Deposit Density) and kinds of disc types. The TOV(Power Frequency Temporary Overvoltage) were estimated by EMTP(Electromagnetic Transient Program) for both 154 kV and 345 kV transmission system. The overvoltage level was appeared 1.35 p.u. between phase to ground for both 154 kV and 345 kV transmission system, but finally this factor was not applied to the design standard considering current design standard and economic point of view. With regard to classification of contamination area of 345 kV transmission system, we added the clean area which was not specified in the current design practise.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
• /
• pp.386-391
• /
• 2004

To find out the reason of accident by being stained of insulators, this paper researched and analyzed the result of electrical characteristic test and field test of EHV insulator through artificial contaminated method. The best way to evaluate contaminated level of insulator surface is getting a contamination data by regional groups continually. But it is needed a lot of time and manpower. To overcome those difficulties, this research introduced ESDD(equivalent salt deposit density) measurement method which is adapted to the international codes of IEC and compared the relation between experimental test results which contaminated insulators by going through stain procedure and electrical measurement results.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 하계학술대회 논문집 A
• /
• pp.527-529
• /
• 2004

This paper researched leakage current characteristics of EHW insulators(36,000lbs) to artificially contaminated clay and kaolin through construction of long-periods testing facility. Insulators were contaminated and classified into the ESDD level(B, C and D) under IEC Pub. 60507 standards method. As a result of tests, leakage current of the heavily contaminated D level to clay was approximately 2,260 $[\muA]$, which is contaminated to kaolin was approximately 3,200 $[\muA]$, during initial rainfall. However after raining, leakage current of naturally washed contamination insulators was lower at approximately 300 $[\muA]$. As regular temperature $20^{\circ}C$, leakage current increased greatly in case humidity density was over $72\%$. But, leakage current was not influenced by temperature variation in case of regular $\%$ humidity.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 춘계학술대회 논문집 전기설비전문위원
• /
• pp.173-175
• /
• 2004

The degree of contamination on outdoor insulators is one of the most importance factor to determine the pollution level of outdoor insulation. Outdoor insulators in coastal are affected due to salty wind blowing from the seaside. The sea salt is known as the most dangerous pollutant. As known through the preceding study, the generation of salt pollutant and the pollution degree of outdoor insulators have a close relation in accordance with meteorological conditions, such as temperature, humidity, dewpoint, wind velocity and wind direction. Therefore, at first, we have analyzed relation between meteorological conditions and contaminants for development of prediction method. In this paper, we have investigated a statistical estimation technique based on actual data for equivalent salt deposit density(ESDD) of outdoor insulators which were installed in Kochang field test substation with multiple linear regression analysis.