• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.510-512
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• 2000

This paper describes the voltage induced at neutral line and the proper location of lightning arrester in combined 22.9 kV class distribution line jointed overhead line and cable each other Modeling is established in ATP Draw to perform simulation. Simulated distribution line at this paper consists of distribution line 4.2km and underground distribution line 2km. Overvoltage and induced voltage are analyzed at several point of combined line. Analysis results was compared to select the best point to install arrester. Such analysis technology will be applied to obtaining capacity and location of arrester in the similar combined distribution line.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.05b
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• pp.175-179
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• 2005

The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.07b
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• pp.1171-1174
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• 2004

Leakage current of the polymer arrester(42kV, 10kA, Class3) for railroad line applied actually field was observed and electrical characteristics of arrester before and after applied actually field were investigated. During applied actually field, leakage current of arresters were $610{\sim}647{\mu}A$ in AN SAN line and $500{\mu}A$ in YUNG DONG line. After applied actually field, electrical characteristics of arrester, such as insulation test, reference voltage test, leakage current test and partial discharge current test, wasn't variation as before applied actually field.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.3
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• pp.497-502
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• 2012

Power line communication(PLC) is a kind of communication technology, was made use of controling a frequency narrow band, but as the PLC technology developing, in the near future get to the commercial step that is broadband PLC upto 30 MHz. This paper deals with the PLC of electric railway using capacitive signal coupler. An AC arrester for catenary is used as a capacitive signal coupler, has the characteristic of capacitor. As a result of field test, a messenger wire used PLC contain much of conducted noise about overall frequency band and also signal attenuation rate increased with increasing frequency between two points. and the communication speed of PLC used messenger wire is 793kbps at a distance of 40m. Experimental results show the possibility of PLC using a messenger wire and an AC arrester for catenary at electric railway.

• Proceedings of the KIEE Conference
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• 2003.11b
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• pp.63-66
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• 2003

Resident mobile communication system technology has been developed. But, surged high voltages in antenna generally have damaged mobile communication. To solve this problem, we use arrester in Rx-Tx line system. That is, the arrester is to protect devices in system against considerable over-voltages or lighting strike. Currently, system protection using of arrester has been arrived in content level but these days, the fact of PIMD(Passive Intermodulation Distortion) which is RF passive components' nonlinear characteristic has appeared. This paper describes PIMD' causes occurred in arrester-estimated from Gas tube capsule, plating, temperature, humidity by experiment.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.53 no.11
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• pp.776-779
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• 2004

Resident mobile communication system technology has been developed. But, surged high voltages in antenna generally have damaged mobile communication. To solve this problem, we use an arrester in Rx-Tx line system. That is, the arrester is introduced to protect devices in system against considerable over-voltages or lighting strike. Currently, system protection using an arrester has arrived in a content level but these days, the PIMD(Passive Intermodulation Distortion) with RF passive components' nonlinear characteristic has appeared. This paper describes PIMD' causes occurred in arrester-estimated from Gas tube capsule. plating, temperature, and humidity by experiment.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.335-336
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• 2008

Overhead transmission lines are mainly crossing mountainous area. They are easily affected in weathers like typhoon, strong wind, lightning, heavy rain, or heavy snow. Sometimes these weathers cause transmission line faults. A lightning flashover is most often fault. Nowadays lightning density in KOREA is growing high and lightning flashovers occur more often. A lightning flashover on transmission line is mostly cleared by momentary operation of a circuit breaker, so power failure happens rarely. However, when both circuits trip simultaneously due to the lightning flashovers on double circuit transmission line, short time power failure and voltage drop happen. KEPCO has used transmission line arresters to avoid double circuit simultaneous trip out since 2003. And transmission line arresters cannot be installed with KEPCO's present metal fittings, so various fittings have been used for each transmission line arrester manufacturer. This paper introduces development and standardization of arc-horn and metal fittings for transmission line arrester which can be used for both existing lines and new lines in KEPCO.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.687-690
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• 2000

This paper provides the result of the analysis of the lightening arresters which were disconnected from the power line due to the overvoltage having high current. The effect of thermal runaway on the microstructures of lightening arrester's block was intensively investigated. The chance of the microstructures of the blocks was limited only on the breakdown paths and near them. Also even though a disconnector was disconnected from the arrester, some of the lightening arrester were showed normal characteristics.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.546-547
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• 2005

This study aims to evaluate the properties and the performance of the newly designed disconnector for surge arrester. This disconnector was verified with the performance in long-duration current impulse test and high current impulse test. And time-current characteristic test was done at 20A, 200A and 800A(3points) for simulating the internal fault condition of the arrester. The results of this test was very good. Consequently, the newly designed disconnector was, evaluated that it is possible to be used for surge arrester in distribution line system.

• Proceedings of the KIEE Conference
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• 1999.07d
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• pp.1642-1644
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• 1999

This paper provides the results of dielectric properties for aged or controlled lightening arresters. The aged lightening arresters were used for five years in distribution line. The leakage current of lightening arresters and elements was measured to confirm whether the lightening arrester was deteriorated or not. The microstructure was also investigated to determine the size of grain and grain boundary. The dielectric properties of aged lightening arresters were compared to those of controlled lightening arresters. The dielectric constant and the tan${\delta}$ of aged lightening arrester were larger than those of controlled one, resulting from accelerated aging due to the thin grain boundary.