Re-engineering design of grounding system (GS) is presented of a 300 KVA transformer from the Universidad Veracruzana, as a background measurements were made to transformer with an power quality analyzer, from the measured and analyzed data high values were detected of harmonics in the neutral, we deduce that the problem is in the GS, to verify the above, measurements were made with a grounding electrode tester, obtaining high resistance in the rods of GS, this value fail with respect to norm NOM -001-SEDE-2012, also, the contact and step potentials were simulated with the help of ETAP Software showing a dangerous potential difference for the human being, a methodology is proposed for the design and re-engineering of SG of the transformer through actual system analysis, calculations and simulations using ETAP software, obtaining values that comply with the normative and most importantly that provide security to people and equipment’s.
In this research are presented the results of the measurements of the electrical parameters obtained by the three phase analyzer of electrical energy, there was used a methodology based on the own manual of the analyzer equipment, well as the national and international standards as well the IEEE Institute, the CFE company, and books of the subject, in which are stablished the limits and requirements for a good quality of the electrical energy necessary for the user of the electrical service. The contribution covers from the conection of the entry of the analyzer equipment until the instalation to the exit of low tension in the transformer, verifying in the equipment the vectorial diagrams and senoidals for corroborate that their conection be adequate, also were considered the measurements of the security in the instalation of the measurement equipment, throughout the document are mentioned the characteristics and the interpretation of each electrical parameter analyzed.
The contribution of this work is to present the design of a prototype integrated by an induction motor, a data acquisition system, accelerometers and control devices for stop and start, to generate and identify different types of faults by means of vibration analysis. in the domain: time, frequency or frequency-time, through the use of the Fourier Transform, Fast Fourier Transform or Wavelet Transforms (wavelet transform). In this prototype, failures can be generated in the induction motor such as: unbalance, different types of misalignment, mechanical looseness, and electrical failures such as broken bars or short-circuited rings, an example of a misalignment failure is presented to show the process of analysis and detection.
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