Abstract
Electrical equipment and supply cables demand a better quality of supply, with the recent advancements in integrated sensitive solid-state controls. Divergently, proliferated heavy inductive motors and some performance additions based on power electronics have introduced power quality issues to the network. Thus, this study mainly investigates the impact of switching transients generated by electromechanical machines in industrial power systems on insulation deterioration while taking transient overvoltages due to capacitor bank switching also to support. Transients with a high rate of rise are likely to catalyze the degradation of the insulation quality and break down the insulating material through ionization. These steeply passing overvoltage stresses let partial discharges ensue, which can attack the insulation over long service. To unveil this danger, 314 common-mode transient waveforms were measured in the electrical machines of five tea factories in Sri Lanka, in a 50 ms measurement window, taken in 55 measuring attempts. Most of the transients observed are in the form of a damped oscillatory waveform tailed by fast exponential collapse. That correlates to insulation degradation having a very steep rise as 30.04 V/ns, the highest at the withering section. When machines are heavily loaded, situations tend to generate transients with high amplitudes. There were transient bursts that spread as 426.3 ms, while 14 ns fast rise times were recorded from withering motors. Unlike electrical resonance and power-frequency overvoltages, electromagnetic switching transients last even less than 100 ms. To underline this, an analysis of the frequency domain of transients was also presented, which proves high density of high-frequency components reaching 107 kHz range. Accepting the fact that frequency and amplitude are always under the influences of innumerable dynamics, the observational evidence of the study endorses that electrical stress built by the transient nature of the factories reduces the life expectancy of electrical insulation.
Highlights
In the modern industrial environment, power quality has become a sensitive burden to deal with. is is due to the impact it builds with a growing number of complaints that log to electrical manufacturers, electricity providers, and end-users. e different roots of power quality issues are majorly reported from severe to modest change voltage disturbances and power supply variations [1]
As reported in [13], PicoScope 3206A, 200 MHz oscilloscope, was used to record voltage waveforms with a sampling rate of 500 Ms/s using a laptop that operates on its battery. e common-mode transients generated in electrical machines under test were measured using a 1000x attenuated P6015A Tektronix High Voltage (HV) Probe
Five large-to-medium-scaled tea factories in Sri Lanka were observed during the study in light of recording transient pulses. e main focus was kept on three major stages of tea processing, withering, rolling, and drying. ese are the stages that induction machines of higher-rated horsepower are utilized. is particular effort is more biased towards analyzing the voltage transient impact on insulation degradation and impact on capacitor banks
Summary
In the modern industrial environment, power quality has become a sensitive burden to deal with. is is due to the impact it builds with a growing number of complaints that log to electrical manufacturers, electricity providers, and end-users. e different roots of power quality issues are majorly reported from severe to modest change voltage disturbances and power supply variations [1]. Erefore, this paper reports the transient influence on insulation quality in an industrial installation while taking the diffusion of capacitor bank switching transients into the matter. Switching of capacitor banks parades a notorious role in industrial facilities, since the majority of such environments are demanding the requirement of capacitor bank installations to keep the power factor of the facility at a stipulated level [3]. It is done based on the observations carried out at several large-tomedium-scale tea factories in Sri Lanka. It is done based on the observations carried out at several large-tomedium-scale tea factories in Sri Lanka. is further discusses how the situation will affect the capacitor bank failures in industrial facilities due to supply system irregularities
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