A novel instrumentation scheme based on cold electronics for testing of superconducting cable

摘要

Superconducting power devices are designed for handling bulk power. These devices are subjected to high voltages, high currents and thermal cycles from room temperature to operating cryogenic temperatures. Further, they undergo various testing procedures during design phase, involving online monitoring, data logging and control of various parameters. The number of sensors required for performance-monitoring is limited by number of pins in the available feedthrough. Further monitoring all the sensors individually requires large number of copper leads, making the monitoring more clumpsy and causing more heat in leak from the ambient. This paper presents cold electronics based instrumentation scheme for interfacing multiple sensors (temperature, pressure, flow, field etc.) mounted on HTS superconducting cables with minimum number of leads but with same accuracy. For this an instrumentation based on multiplexed cold electronics (along with sensors) operating from 300 K down to 65 K is developed in-house. The developed scheme is tested on HTS superconducting cable and the results are presented in this paper.