Over-Current Characteristics of 275-kV Class YBCO Power Cable

Abstract

In Japan, a project for the development of a 275-kV class YBCO power cable started in 2008. High-temperature superconducting (HTS) power cables typically consist of a copper former, an HTS conductor layer, an electrical insulation layer, an HTS shield layer, and a copper shield layer. In practical applications, the 275-kV class transmission line may be subjected to short-circuit fault currents such as 63 kA rms for a duration of 0.6 s. Therefore, in order to ensure the stability and demonstrate the feasibility of the cable, it is important to estimate the current distribution and temperature increase under the fault condition. We designed the copper former, copper shield layer, and copper plating of the YBCO coated conductor carefully so as to fulfill the requirements of practical applications. In this study, we carried out over-current experiments on a 2-m long YBCO model cable and performed numerical simulations by a computer program developed using the finite element method (FEM) and an electric circuit model. We investigated the electromagnetic and thermal behaviors of the cable under fault conditions from the experimental and simulation results.

Current Margin of 275 KV Class HTS Power Cable With Joint Against Fault Current

“…full core model shown in Fig. 1 in previous research [11]. The fault current peak for a coated conductor was 412 A.…”

“…Next, the HTS power cable was designed and the current in YBCO coated conductors was calculated under fault conditions using the computer program [10]. Further, over current tests were carried out on the model cable based on the cable design [11]. The objective of this study is to evaluate the current margin of a coated conductor by carrying out over-current experiments on the two types of HTS model cables, jointed and jointless cables, and to numerically calculate the electric and thermal characteristics on the joint area of the coated conductor.…”

Simulation for the Fault Current Limiting Operation of REBCO CORC Superconducting Cables With Different Core Materials

“…This fault current limiting (FCL) feature of HTS cables possibly enables the development of much safer power transmission/distribution systems. Therefore, extensive research and development related to cable design have been done to test and improve the FCL capability of HTS cables[5,6,7,8,9,10,11]. Advanced Conductors Technologies in collaboration with the Center for Advanced Power Systems (CAPS) developed and tested FCL performance on two CORC ® cables, one has 8 layers of two 2G REBCO tapes wound on a copper core and the other has 6 layers of three REBCO tapes wound on a stainless steel core.…”