Progress and Status of a 2G HTS Power Cable to Be Installed in the Long Island Power Authority (LIPA) Grid

Abstract

Underground high temperature Superconductor (HTS) power cables have attracted extensive interest in recent years due to their potential for high power density. With funding support from the United States Department of Energy (DOE), the world's first transmission voltage level HTS power cable has been designed, fabricated and permanently installed in Long Island Power Authority (LIPA) grid. The HTS cable was successfully commissioned on April 22, 2008. In 2007, a new DOE Superconductor Power Equipment (SPE) program to address the outstanding issues for integrating HTS cables into the utility grid was awarded to the current project team (LIPA II). The goal of the LIPA II is to develop and install a replacement phase conductor manufactured using AMSC's second generation wire. In addition to the replacement of the phase conductor, the team will also address the outstanding components development necessary for full scale integration into a power grid including integral management of thermal shrinkage of the cable conductor, optimization of the cryostat design to mitigate the implications of potential cable damage, and the development and demonstration of a field splice in the operating utility grid and modular higher efficiency refrigeration system. This paper will report on the progress and status of LIPA II program. In addition, in-grid operation experience of existing 1G HTS Power cable is presented.Index Terms-HTS cable, LIPA and transmission level voltage, 2G HTS power cable.

Results of Japan's First In-Grid Operation of 200-MVA Superconducting Cable System

“…This measured value and designed value, which is calculated by the relative permittivity (ε r ) of the laminated paper measured in a 30-meter-long HTS cable test [2], are in good agreement each other.…”

AC Loss Measurements on Multi-Filamentary $ \hbox{MgB}_{2}$ Wires With Non-Magnetic Sheath Materials

“…This can be attributed to the magnetic field dependency of the critical current density. At high fields, the critical current density significantly reduces, leading to a lower loss than predicted by (1). Fig.…”

“…Nevertheless, several large projects of e.g. power cables [1], [2] and motors [3] have demonstrated the technical feasibility, and a few systems of a high-temperature superconductor based induction heater have been sold on a commercial basis [4]. These devices operate either under DC conditions or at low AC magnetic fields.…”

Thermodynamic design of 10 kW Brayton cryocooler for HTS cable

“…For the ongoing HTS power cable project in Long Island Power Authority (LIPA) grid, Air Liquide designed a Brayton cryocooler with helium as refrigerant for 12 kW at 65 K [5], and they lately started to design a modular refrigeration system based on Brayton cycle for 22 kW at 72 K [6]. For the HTS cable system produced by the Tokyo Electric Power Co. [7], several units of Stirling cryocoolers with 0.8 kW at 67 K were employed for short-length tests.…”