[논문]Design of HTS power cable with fault current limiting function

Kim, Dongmin; Kim, Sungkyu; Cho, Jeonwook; Kim, Seokho

doi:10.9714/psac.2020.22.1.007

Design of HTS power cable with fault current limiting function 원문보기

Progress in superconductivity and cryogenics : PSAC, v.22 no.1, 2020년, pp.7 - 11

Kim, Dongmin (Changwon University) , Kim, Sungkyu (Korea Electrotechnology Research Institute (KERI)) , Cho, Jeonwook (Korea Electrotechnology Research Institute (KERI)) , Kim, Seokho (Changwon University)

Abstract ▼ AI-Helper

As demand for electricity in urban areas increases, it is necessary to improve electric power stability by interconnecting neighboring substations and high temperature superconductor (HTS) power cables are considered as a promising option due to its large power capacity. However, the interconnection of substations reduces grid impedance and expected fault current is over 45 kA, which exceeds the capacity of a circuit breaker in Korean grid. To reduce the fault current below 45 kA, a HTS power cable having a fault current limiting (FCL) function is considered by as a feasible solution for the interconnection of substations. In this study, a FCL HTS power cable of 600 MVA/154 kV, transmission level class, is considered to reduce the fault current from 63 kA to less than 45 kA by generating an impedance over 1 Ωwhen the fault current is induced. For the thermal design of FCL HTS power cable, a parametric study is conducted to meet a required temperature limit and impedance by modifying the cable core from usual HTS power cables which are designed to bypass the fault current through cable former. The analysis results give a minimum cable length and an area of stainless steel former to suppress the temperature of cable below a design limit.

주제어

표/그림 (12)

그림 Fig. 1. Circuit diagram of HTS wire.
그림 Fig. 2. Temperature dependent resistance of REBCO wires.
그림 Fig. 3. Measurement of critical current at 77 K.
그림 Fig. 4. Circuit diagram of FCL HTS power cable.
표 TABLE I SPECIFICATIONS OF HTS WIRE.
그림 Fig. 5. Schematic diagram for the cross section of FCL HTS power cable.
그림 Fig. 6. Calculated allowable cycles of FCL HTS power cable by lumped analysis.
그림 Fig. 7. Calculated fault current of FCL HTS power cable by lumped analysis.
표 TABLE II SPECIFICATIONS AND ANALYSIS PARAMETERS OF FCL HTS POWER CABLE.
그림 Fig. 8. Comparison of FEM and lumped analysis for the allowable cycles and the fault current.
그림 Fig. 9. Representative FEM analysis results for the variation of temperature and fault current when the cable length is 9 km.
표 TABLE III FEM ANALYSIS PARAMETERS.

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문제 정의

This paper describes a design of FCL HTS power cable of 600 MVA, 154 kV class with developed HTS wires. The target FCL function of the cable is reducing the fault current from 63 kA to less than 45 kA considering transmission level in South.

제안 방법

Through the lumped analysis model, it was confirmed that the cable length should be longer than 6 km with a stainless steel cross sectional area of former of 1,200 mm2 to limit the maximum temperature below 95 K while reducing the fault current below 45 kA from 63 kA. For more precise simulation, FEM analysis was conducted with the cross section of the cable using a fully coupled heat transfer and electric circuit model. Due to the localized heat generation and poor heat transfer between the HTS layer and stainless steel former, the temperature of HTS layer increased more than the lumped model.
In this study, we developed a simplified lumped analysis model to design of a FCL HTS power cable. For the precise modelling, the resistances of manufactured HTS wires were measured and taken into the analysis model.
Prior to detail design and analysis on the thermal and electric behavior of FCL HTS power cable, a lumped analysis, which assumes uniform temperature in the cross section of cable, was conducted to investigate the effect of design parameters such as the cable length and the cross sectional area of former.
To meet the allowable temperature rise and the fault current reduction, parametric studies were conducted for the resistance characteristics of the HTS wire, cross sectional area of former which is made by stainless steel and the cable length. The design process involved a thermal analysis model incorporated with an electric circuit that includes electric characteristics of FCL HTS power cable.

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