Modern industrial enterprises feature the widespread use of non-linear loads, such as induction furnaces, which are powerful sources of higher harmonics. The deterioration of electric power quality, particularly non-sinusoidal voltage, poses serious risks to occupational safety, including overheated equipment, false activation of protection devices, and an increased likelihood of electrical trauma.
The goal of this study is to analyze non-sinusoidal voltage indices in a power supply system with induction furnaces, assess the impact of static condenser accumulators on the level of higher harmonics, and identify associated threats to industrial safety.
The object of the study is a power supply system of an industrial enterprise with induction furnaces. The methodology is based on experimental measurements using the PKK-57 analyzer. The measurements were taken at key network points with both connected and disconnected Static Capacitor Banks, followed by spectral and statistical analysis of the obtained data.
As established, connecting static condenser accumulators instead of suppressing them causes a resonance amplification of individual harmonics. The level of the fifth voltage harmonic between phases 1 and 2 increased from 1.19 % to 8.14 %, which exceeded the standard by 8 %. Similarly, in phase currents, the fifth harmonics reached 18.93 %. This causes significant additional losses, overheating of conductors and transformers, and breaches the correct operation of microprocessor protection relays, thus directly threatening electrical safety.
Using standard accumulators of static condensers in networks with non-linear loads is not permissible without a prior analysis of the harmonics’ composition, as it can cause sudden deterioration of electric power quality and generate critical risks to personnel and equipment safety.
A promising field is the development and implementation of adaptive compensation systems, such as active harmonic filters and filter compensating devices, that can dynamically suppress resonance harmonics, simultaneously ensuring power efficiency and safe working conditions.
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