Determining the Inductance of a High Voltage System with an Impedance-Based Arc-Flash Determination Device

School Name

Governor's School for Science & Mathematics

Grade Level

12th Grade

Presentation Topic

Physics

Presentation Type

Mentored

Mentor

Mentor: Curtiss Fox, Clemson University Restoration Institute

Abstract

At Clemson University Restoration Institute (CURI) an Impedance-based Arc-Flash Determination Device (IADD) was used to determine the inductance of a system. This measurement is important for high voltage systems because of safety concerns. The IADD measures the current and voltage, and uses it along with a known resistance to calculate the impedance of the system, and from the impedance the inductance can be calculated. The IADD consists of a bank of five 1KΩ resistors, a controller to switch the circuit on and off, and a myRio to measure the current and voltage. The three phase 120V source was supplied by a wall outlet. The slope of the voltage was found using a linear regression line of the voltage before, during, and after the voltage was switched on and off. MATLAB was used to analyze the data. An average impedance of 18.16 + j5.107Ω was found from 100 samples, using three inductors, with an inductance of 13.5mH and a 13.5 percent error. An average impedance of 36.1 + j12.077Ω was obtained from 35 samples, using a large inductor, with an inductance of 32.04mH and a 7.56 percent error.

Start Date

3-25-2017 11:59 PM

Presentation Format

Oral Only

Group Project

No

COinS
 
Mar 25th, 11:59 PM

Determining the Inductance of a High Voltage System with an Impedance-Based Arc-Flash Determination Device

At Clemson University Restoration Institute (CURI) an Impedance-based Arc-Flash Determination Device (IADD) was used to determine the inductance of a system. This measurement is important for high voltage systems because of safety concerns. The IADD measures the current and voltage, and uses it along with a known resistance to calculate the impedance of the system, and from the impedance the inductance can be calculated. The IADD consists of a bank of five 1KΩ resistors, a controller to switch the circuit on and off, and a myRio to measure the current and voltage. The three phase 120V source was supplied by a wall outlet. The slope of the voltage was found using a linear regression line of the voltage before, during, and after the voltage was switched on and off. MATLAB was used to analyze the data. An average impedance of 18.16 + j5.107Ω was found from 100 samples, using three inductors, with an inductance of 13.5mH and a 13.5 percent error. An average impedance of 36.1 + j12.077Ω was obtained from 35 samples, using a large inductor, with an inductance of 32.04mH and a 7.56 percent error.