• Title/Summary/Keyword: Current limiting characteristics

Search Result 323, Processing Time 0.042 seconds

Characteristics of a 190 kVA Superconducting Fault current Limiting Element (190 kVA급 초전도한류소자의 특성)

  • Ma, Y.H.;Li, Z.Y.;Park, K.B.;Oh, I.S.;Ryu, K.Y.
    • Progress in Superconductivity and Cryogenics
    • /
    • v.9 no.1
    • /
    • pp.37-42
    • /
    • 2007
  • We are developing a 22.9 kV/25 MVA superconducting fault current limiting(SFCL) system for a power distribution network. A Bi-2212 bulk SFCL element, which has the merits of large current capacity and high allowable electric field during fault of the power network, was selected as a candidate for our SFCL system. In this work, we experimentally investigated important characteristics of the 190 kVA Bi-2212 SFCL element in its application to the power grid e.g. DC voltage-current characteristic, AC loss, current limiting characteristic during fault, and so on. Some experimental data related to thermal and electromagnetic behaviors were also compared with the calculated ones based on numerical method. The results show that the total AC loss at rated current of the 22.9 kV/25 MVA SFCL system, consisting of one hundred thirty five 190 kVA SFCL elements, becomes likely 763 W, which is excessively large for commercialization. Numerically calculated temperature of the SFCL element in some sections is in good agreement with the measured one during fault. Local temperature distribution in the190 kVA SFCL element is greatly influenced by non-uniform critical current along the Bi-2212 bulk SFCL element, even if its non-uniformity becomes a few percentages.

Fault Current Limitation by a Superconducting Coil with a Reversely Magnetized Core for a Fault Current Controller

  • Ahn, Min Cheol;Ko, Tae Kuk
    • Progress in Superconductivity and Cryogenics
    • /
    • v.14 no.4
    • /
    • pp.36-40
    • /
    • 2012
  • This paper presents an experimental and numerical study on current limiting characteristics of a fault current controller (FCC). The FCC consists of an AC/DC power converter, a superconducting coil, and a control unit. Even though some previous researches proved that the FCC could adjust the fault current level, the current limiting characteristics by the superconducting coil should be investigated for design of the coil. In this paper, four kinds of model coils were tested; 1) air core, 2) iron core without any bias, 3) reversely magnetized core (RMC) using permanent magnets, and 4) RMC using an electromagnet. Based on a comparative study, it is confirmed that a RMC by an electromagnet (EM) could increase the effective inductance of the coil. In this paper, a numerical code to simulate the HTS coil with RMC was developed. This code can be applied to design the HTS coil with active reversely magnetized bias coil.

The Study on Current Limiting Characteristic Analysis of Magnetic Shielding Type Fault Current Limiter

  • Lee, Jae;Lim, Sung-Hun;Kang, Hyeon-Gon;Ko, Seok-Cheol;Han, Byoung-Sung
    • Progress in Superconductivity
    • /
    • v.3 no.2
    • /
    • pp.235-240
    • /
    • 2002
  • In this paper, we investigated the current limiting characteristic in the magnetic shielding type fault current limiter(MSFCL). The circuit analysis was executed by using finite differential method(FDM). This paper suggests that the current limiting performance can be achieved in two ways (resistive and inductive one), according to design parameter. By comparing current limiting characteristics in two ways and surveying the important parameters which determine the operational way after fault occurs in the design of MSFCL, it is shown that the magnetic shielding type fault current limiter can be operated in either resistive or inductive way.

  • PDF

Limiting Current Characteristics using Superconducting Fault Current Limiter in Power System (배전계통에 초전도 한류기 적용시 전류제한특성)

  • Kim, Jin-Seok;Lim, Sung-Hun;Ahn, Jae-Min;Moon, Jong-Fil;Kim, Jae-Chul;Kim, Chul-Hwan;Hyun, Ok-Bae
    • Proceedings of the KIEE Conference
    • /
    • 2008.07a
    • /
    • pp.21-22
    • /
    • 2008
  • The increase of fault current due to larger power demand has caused the capacity of power machines in grid to increase. To protect the power system effectively from the increased fault current, the superconducting fault current limiter (SFCL) have proposed one of several countermeasures. Therefore, to introduce SFCL into power distribution system, the position of SFCL in power distribution system is selected among some cases. Each position changes fault current limiting characteristics and SFCL's requirement. In this paper, the characteristics of limiting fault current according to installed SFCL's location in power distribution system.

  • PDF

AC Loss Characteristic in the Fault Current Limiting Elements of a Coil Type (코일형 한류소자의 교류손실 특성)

  • Ryu, Kyung-Woo;Ma, Yong-Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.18 no.4
    • /
    • pp.370-374
    • /
    • 2005
  • AC loss of a superconducting conductor has a strong influence on the economic viability of a superconducting fault current limiter, which offers an attractive means to limit short circuit current in power systems. Therefore, the AC loss characteristics in several fault current limiting elements of a coil type have been investigated experimentally. The test result shows that AC losses measured in the fault current limiting elements depend on arrangement of a voltage lead. The AC loss of a bifilar coil is smallest among the fault current limiting elements of the coil type. The measured AC loss of the bifilar coil is much smaller than that calculated from Norris's elliptical model. However, the loss measured in a meander, which is frequently used in a resistive fault current limiter, agrees well to the theoretical one.

Current Limiting Characteristics According to the Increase of Voltage in Separated Three-Phase Flux-Lock Type Superconducting Fault Current Limiter Using YBCO CC (YBCO CC를 이용한 분리된 삼상 자속구속형 고온초전도 전류제한기의 전압 증가에 따른 전류제한 특성)

  • Doo, Seung-Gyu;Du, Ho-Ik;Kim, Min-Ju;Kim, Yong-Jin;Lee, Dong-Hyeok;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.06a
    • /
    • pp.355-356
    • /
    • 2009
  • In this paper, we investigated the fault current limiting characteristics according to the increase of voltage in the separates three-phase flux-lock type high-Tc superconducting fault current limiter using YBCO CC. The separated three-phase flux-lock type SFCL consists of single-phase flux-phase type SFCL in each phase. Superconductor was using the YBCO CC. To analyze the current limiting characteristics of a three-phase flux-lock type SFCL, the short circuit experiments were carded out fault such as the triple line-to-ground fault. The experimental result shows that fault current limiting characteristics was improved on the high voltage level.

  • PDF

Comparison of HTS conductors for a DC resistive type fault current limiting module

  • So, Jooyeong;Lee, Seyeon;Choi, Kyeongdal;Lee, Ji-kwang;Kim, Woo-Seok
    • Progress in Superconductivity and Cryogenics
    • /
    • v.21 no.4
    • /
    • pp.39-43
    • /
    • 2019
  • The breaking of a circuit in DC grid could pose a challenge because of the absence of zero-crossing instant for both current and voltage when a fault occurs. An additional fault current limiting function will be very helpful for reducing the burden of the DC circuit breaker by limiting the fault current to a reasonable value. In this paper, we studied the overcurrent characteristics of several HTS conductors so that we could use the selected conductors for the basic design work of a resistive type fault current limiting module as a part of the circuit breaking system. According to the short-circuit test results, we suggested and compared two different basic design parameters of the HTS fault current limiting module, which will be connected in series to the DC circuit breaker.

Current Limiting Characteristics of Flux-lock Type SFCL according to Inductance Variation

  • Choi Hyo-Sang;Park Hyoung-Min;Cho Yong-Sun
    • Transactions on Electrical and Electronic Materials
    • /
    • v.7 no.2
    • /
    • pp.87-89
    • /
    • 2006
  • We investigated the current limiting characteristics of flux-lock type superconducting fault current limiter(SFCL) according to inductance variation of coil 2. The flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil through an iron core, and the secondary coil is connected to the superconducting element in series. The operation of the flux-lock type SFCL can be divided into the subtractive and the additive polarity winding operations according to the winding directions between the coil 1 and coil 2. The current limiting characteristics in two winding directions were dependent of on the ratio of the number of turns of coil I and coil 2. The fault current increased when the number of turns of coil 2 increased in the subtractive polarity winding. On the contrary, the fault current decreased under the same conditions in case of the additive polarity winding.

Fault Current Limiting Characteristics of Resistive Type SFCL using Transformer (변압기를 이용한 저항형 고온초전도 전류제한기의 한류 특성)

  • 임성훈;최효상;고석철;이종화;강형곤;한병성
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
    • /
    • 2003.10a
    • /
    • pp.288-290
    • /
    • 2003
  • The transformer is expected to be an essential component of resistive type superconducting fault current limiter (SFCL) for both the increase of voltage ratings in SFCL and the simultaneous quench due to different critical current between HTSC elements. However, for the design to prevent the saturation of iron core and the effective fault current limitation, the analysis for operation of SFCL with consideration for the magnetization characteristics are required. In this paper, the fault current limiting characteristics related with the magnetization ones were investigated through the variation of the ratio of the number of turns in the 1st and the 2nd windings. The proper design condition with variation of the number of turns to make the effective fault current limiting operation could be determined.

  • PDF

Analysis of the Initial Fault Current Limiting Point of the SFCLs (고온초전도 전류제한기의 초기사고전류 제한시점 분석)

  • Park, Chung-Ryul;Du, Ho-Ik;Doo, Seung-Gyu;Kim, Yong-Jin;Kim, Min-Ju;Cho, Yong-Sun;Choi, Hyo-Sang;Han, Byoung-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.06a
    • /
    • pp.292-292
    • /
    • 2008
  • The superconducting fault current limiter(SFCL) can be used to limit fault current level in electrical transmission line and power system. Up to now, there are several kinds of SFCL that have proposed and it is expects that they will be applied to appropriated position considering their own properties; initial fault current limiting instant and the current limiting characteristics. In this paper, we investigated the initial fault current limiting instant and the amplitude of initial fault current in the resistive type, the flux-lock type, the flux-coupling type and the transformer type SFCL. Experiment results show that the initial fault current limiting instant and the amplitude of initial fault current of the SFCLs are dependant on the ratio of inductance of primary and secondary coils.

  • PDF