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지락고장에 의해 금속제 유연전선관에 유도된 개폐서지전압의 특성
이복희(Bok-Hee Lee),신건진(Gun-Jin Shin),박희열(Hee-Yeoul Park),엄상현(Sang-Hyun Um),김유하(You-Ha Kim) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.5
This paper presents the transient behavior of the switching surge voltages generated by interruption of DC ground fault currents flowing through metal flexible conduits. All fault circuits consist of line parameters such as resistance, inductance, capacitance and conductance. The use of nonmagnetic metal conduits should be taken into account in order to reduce the inductance of battery charger distribution circuits. The frequency-dependent circuit parameters of metal flexible conduits were measured. The switching surge voltages generated at the ground fault circuit consisted of steel-galvanized alloy and aluminium conduits were investigated. As a result, the impedances of metal flexible conduits are significantly increased over the range of the frequency above 10 kHz and the switching surge voltages generated along aluminium flexible conduit are lower than those along steel-galvanized alloy conduit when DC fault current is interrupted.
이복희(Bok-Hee Lee),박희열(Hee-Yeoul Park),신건진(Gun-Jin Shin),배관영(Gwan-Young Bae),류춘형(Chun-Hyoung Ryu),이강희(Kang-Hee Lee) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.3
In this paper, in order to analyze lightning impulse response characteristics in combined installations of SPDs and RCDs, surge protection coordination between SPDs and RCDs are experimentally investigated by using the combination wave generator. Six different types of single-phase residual current operated circuit-breakers with integral overcurrent protection for household and similar uses(RCBOs) being present on the domestic market are tested according to KS C IEC 61009-1 standard. As a result, when a class I SPD is located on the source side of an RCBO, all kinds of specimens are able to provide the proper coordination between the SPD and RCBOs without nuisance tripping, unintended operation or damage due to test impulse currents. However, in the case that the class II SPD is located on the load side of RCBOs, a lot of L-N mode injected currents is split into the RCBO, and a few RCBOs are damaged. Coordination between SPDs and RCDs is not valid and a role of SPDs is of no use. When combining SPDs with RCDs, it is necessary to select SPDs and RCDs in consideration of the protection voltage level of metal oxide varistor embedded in RCDs.