David Wallace

Mississippi State University | MSU · Department of Electrical and Computer Engineering

Understanding the damage mechanisms of fiber-reinforced polymer matrix composite materials under high voltage conditions is of great significance for lightning strike protection and high voltage insulation applications of composite structures. In this paper, we investigated effects of the lightning impulse (LI) voltage and high voltage alternating...

Transformers are essential components in the electrical network and knowing their reliability is critical for the reliability of the entire grid. Dissipation Factor measurements are one of the more widely used methods to inspect instrument transformer integrity. Dissipation factor (DF), also known as Tan Delta (tan δ), is the measure of dielectric...

Partial discharge (PD) measurements have been widely accepted as an efficient online insulation condition assessment method in high voltage equipment. A PD measuring test setup was compiled with the aim to study the variations in the partial discharge characteristics over the insulation degradation in terms of the physical phenomena taking place in...

A restraint device was developed to avoid accidental re-closure of vertical mount switch blades during maintenance operations. To verify safe implementation, long duration tests were performed to define the device's resilience to the high voltage environment in which it to be used. The restraint was exposed to continuous corona discharge for 56 day...

Dissipation Factor is defined as a routine test in virtually every ANSI/IEEE standard applicable to oil filled High Voltage Instrument Transformers (C57.13, C57.13.5, etc.). These standards, recommend performing Dissipation Factor tests at rated voltage and 10 kV rms, both values at rated frequency. There is a clause which states the 10 kV is optio...