Stray Magnetic Field Data of a Synchronous Generator with a Faulty Rotor Winding
Description
This dataset consists of data from external magnetic field measurements of an 8-pole salient synchronous generator. A jupyter notebook, containing metadata and some simple analyses is provided alongside the data. The generator studied is installed in the Electrical Machines and Drives Laboratory (LABMAQ) of the Electrical Engineering Department of the Federal University of Santa Catarina (UFSC), in Florianópolis, Brazil. The measurements were collected from tests carried out by staff from the Electromagnetic Device Design and Analysis Group (GRUCAD), also from UFSC. Two sensors (CH1 and CH2), positioned 90° apart, are responsible for measuring the tangential component of the magnetic field external to the generator. The sensor consists of a coil with 750 turns and a circular cross-section of 7.65 cm². There are data available for seven operation points (OP) (from P15 to P21). For every OP, the apparent power remained the same (7kVA), and the power factor ranged from 1, 0.8, 0.5 and 0.3 lagging to 0.8, 0.5 and 0.3 leading. In the dataset folder, there is a folder named "Data", in which there are seven subfolders, that contain the data of every generator OP. There are measurements corresponding to the healthy machine and the machine subjected to a short-circuit fault in the rotor winding. The tests were carried out by gradually removing turns from one pole of the field winding. The turns removal were performed by an automatic system, that can switch the terminals J1 (20% turns removed), J2 (50% turns removed) and J3 (50% turns removed) without shutting down the generator. For each step of the sequence several files were colletcted. They are called voltage vectors. Each file contains 10 seconds worth of time of the voltage signal coming from the sensors, sampled at 125kHz. The data of each sensor are stored in a column of the csv file. Hence, there are three columns in each file. The first one, with the header Time, containing information about the aquisition time, in seconds, the second one, with the header "CH1", corresponding to the voltage data from the CH1 sensor, and the third one, with the header "CH2", corresponding to data from the CH2 sensor, both in Volts. Comma (",") is used as delimiter, and decimal separator is the ".". These files are named VoltageVectorXX.csv, in which the "XX" stands for the number of the voltage vector. The following table presents the voltage vector numbers corresponding to each OP and fault severety (percentage of turns removed from one pole). OP Healthy 20% 50% 100% P15 1 to 20 21 to 47 48 to 77 78 to 95 P16 1 to 23 24 to 42 43 to 64 65 to 84 P17 1 to 22 23 to 40 41 to 61 62 to 80 P18 1 to 30 31 to 50 51 to 70 71 to 90 P19 1 to 22 23 to 48 49 to 69 70 to 90 P20 1 to 22 23 to 40 41 to 63 64 to 84 P21 1 to 19 20 to 39 40 to 61 62 to 84 It is important to note that there is more than 21.3 Gb worth of data within the dataset.