Supplementary data for Experimental data on PQ from a Steal Mill
There is no doubt that monitoring power quality distortion parameters in our power grids is obligatory, especially at the point of common coupling of an industrial customer. There are three major phases in the operation of an electric arc furnace: boring period, melting period, and refining period. Each of these phases presents different levels of negative impacts on the power system in terms of harmonics, abnormal power factor, voltage fluctuations and other power quality problems [7-9]. The distortions in power quality cause serious problems (though unnoticeable in some occasions) which include excessive heating, equipment malfunctioning and breakdown. This calls for urgent stipulation and strict adherence to a set of power quality regulations for both power suppliers and consumers. This data was obtained through measurement with power quality analyzer equipment for 20 hours period. Figure 1 to 5 shows the graphical representation of the measured Inductive power, Real power, Line Voltage, Apparent power and Phase Current respectively. Distorted waveforms are typically produced by nonlinear power devices (such as arc furnaces, rectifiers, power converter/controllers, arc welding etc) which in effect causes harmonic distortion in a power network. Excess of this distortions in power system results to overheating of power equipment and a resultant damage in both operator and customer equipment . The equipment producing these distortions in form of harmonics can be viewed as harmonic current source devices. The measured individual harmonic current contribution per phase at the PCC from the 2nd harmonics to the 11th harmonics are plotted using histogram (Percentage harmonics contribution against time) as shown in figure 6 to figure 15 respectively. The intermittent nature of power consumption recorded at the PCC shows different stages of steel making processes, with the boring and melting periods representing the recorded peaks in figures. The Total Harmonics Distortion of Current and Voltage (THDc and THDv) are graphically shown in figure 16 and 17 respectively. The raw data of these measured power quality data and all other measured variable are attached to the article as an excel spreadsheet file for easy access and evaluations. The harmonics data attached includes individual harmonics per phase from 2nd harmonics to 50th harmonics, and per-phase data for active power, apparent power, reactive power, voltage, and current for the period of measurement.
Steps to reproduce
These data were acquired through measurement from 5 different Steel manufacturing plant at PCC (33kV and 132kV) between the steel plants and the Utility network using Circuitor AR6 Power Quality Analyser. Circuitor Powervision software, excel spreadsheet software and python code were used for data acquisition and visualization, respectively.