# Current Sensor with Optimized Linearity for Lightning Impulse Current Measurement

## TL;DR

This paper presents high-accuracy impulse current measurement devices suitable for measuring currents up to mega-amperes with improved linearity and calibration methods.

## Contribution

The paper introduces two new high-impulse current measurement devices and a calibration method for currents over 100 kA.

## Key findings

- The developed devices show accurate scale factor and response characteristics for high impulse currents.
- Test results confirm their suitability as standard measurement devices for high impulse current applications.
- The calibration method ensures precise measurement of currents exceeding 100 kA.

## Abstract

Impulse current measurement technology is widely used in various applications, including lightning protection monitoring in power systems, welding current measurement in aircraft and shipbuilding industries, as well as high-current measurement in pulsed power systems. With the advancement of industrial technology, the measurement range of impulse currents has continuously expanded, reaching levels as high as mega-amperes (MA). The calibration of the scale factor for impulse current measurement devices is determined through comparison with standard measurement devices. Developing high-accuracy impulse current measurement devices and accurately judging their characteristics are prerequisites for ensuring the precise calibration of impulse current values. This paper introduces two different types of high-impulse current measurement devices. Experimental studies were conducted on the scale factor and response characteristics of the sensors. The scale factor extension calibration method for sensors under high currents of more than 100 kA has also been introduced. Test results indicate that the developed impulse current measurement devices can serve as standard measurement devices for high impulse current measurement.