On September 27 at 11:30 a.m. in the Parque Barigui room, engineer Fabio Toshio Nakatani will give a presentation on: Hybrid analysis (man+technology) in predictive maintenance of rotating electrical machines. Discussing Industry 4.0 in the area of maintenance in relation to industrial automation and the integration of different technologies. Artificial intelligence, robotics, neural networks and big data with the aim of improving processes and increasing productivity and reliability. But where does this technological evolution leave the role of man (specialist)? How will integrated work between technology and specialists increase the degree of reliability of rotating electrical machines?

Register at https://cbmga.abramanoficial.org.br/ and visit the Nishi stand during your participation in the country’s main Maintenance and Asset Management event.

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PROGRAM:

• Review Theory of rotating electrical machines;
• Technology and state of the art of rotating electrical machines;
• Stator failure mechanism and repair. In each mechanism, the process, root cause is discussed,
  symptoms and remedies are discussed;
• Rotor failure mechanism and repair. In each mechanism, the process, root cause, symptoms and
  symptoms and remedies are discussed;
• Mechanism of core lamina insulation failure. In each mechanism, the process is discussed,
  root cause, symptoms and remedies are discussed;
• General principles of testing and monitoring;
• Off-line testing of the rotor and stator windings. In each test, theory and purpose are discussed,
  method and interpretation are discussed;
• Online testing or monitoring of the rotor and stator winding. In each test or monitoring,
  principles and interpretation are discussed;
• Core tests. In each test, theory and purpose, method and interpretation, test
  test method and interpretation are discussed;
• Factory and field acceptance tests of new winding. Pre-qualification tests are discussed,
  factory and field tests of rotor, stator and core windings are discussed;
• Maintenance strategies. Maintenance options (corrective, preventive and predictive) and inspection for various
  and inspection for various rotating electrical machines.

PRACTICAL EXERCISES:

During the course practical exercises may be conducted with the problems brought by the participants. Therefore, students should bring problems that they have experienced and that have not yet been adequately solved in their company. Some tests will also be performed on insulation systems and/or winding of medium or high voltage motor/generator with a workload of 04 hours.

Registrations can be made by e-mail directly with Hara Engenharia:

E-mail: haraengenharia@gmail.com

Whatsapp: 41 – 9 9624 7347

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We will be discussing an example of the generator failure mechanism which can lead to a quick (months!) insulation breakdown. Do you wish to know that it is?

Please join us on Thursday 04 May 2023, 11am Brazil time (3pm UK time). We will go through details and RCA of 2 generator breakdowns, with hope that it will help you to prevent such situation in the future.

Please join the training using the link below:  
https://meet.zoho.eu/UDSxeI82x6

NOTE:
Please remember to register before the meeting, as number of participants is limited. Chrome and Firefox do not require downloading any other add-ons or apps, therefore these are preferable web browsers. Other web browsers may require downloading additional files. Please check with your IT Department.

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Voltage classification of generators/motors:

• Low Voltage: Round or Enameled Wire / Voltage Class: 127/220/380/440/760 V.
• Medium Voltage: Rectangular Wire / Coils or Bars / Voltage class: 2,3/3,4/4,16/6,6/6,9 kV.
• High Voltage: Rectangular Wire / Coils or Bars / Voltage Class: 13,8/16,5/18,0 kV or higher.

Standardized offline electrical testing:

• Insulation Resistance (IEEE-43);
• Polarization Index (IEEE-43);
• Ohmic Resistance (IEEE-118);
• HypotAC/DC (IEEE-4 / IEEE-95);
• Step VoltageDC (IEEE-95);
• Surge Test (IEEE-522);
• Off-line Partial Discharges (IEEE-1434 / IEC6034-27-1);
• Delta Tangent (IEEE-286);
• Capacitance (IEC 60034-27-30);
• Corona in darkroom) (IEEE-1799).

Turn on the subtitles in your language and watch below in Nishi’s Youtube channel the live recording and learn more about the definition and application of each electrical test according to voltage level and how it is essential for a good diagnosis of the condition of the motor/generator winding.

Take part in upcoming live opportunities to ask questions and make comments directly with an expert on rotating electrical machines.

Get in touch directly with engineer Fabio Toshio and get your questions answered: fabio.toshio@nishi.com.br

Request a commercial proposal: E-mail: nishi@nishi.com.br

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More contents of NISHISAN tips: https://nishi.com.br/novo/en/blog/

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Access below the registration form with information about the course, values and conditions:

Course_Machine Maintenance_November_2021

Machinery Maintenance Course_October_2021

Get in touch with Hara Engineering:

Hara Engineering
Silva Jardim, 2939 9º andar – Agua Verde – 80240-020 – Curitiba
80240-020 – Curitiba – PR
Tel and Fax: 41 – 3322-7818 / 9 9258 5986
e-mail: haraengenharia@gmail.com
www.hara.eng.br

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What is corrective maintenance?

Still very present in companies, corrective maintenance is only used when some equipment breaks down or fails. This method does not use maintenance planning, which leads to the need for parts inventory and availability of professionals, since the failures are not foreseen and cause the idleness of machines and labor.

For example, a machine seems to be in perfect condition and in constant production, but at some point a part presented a failure and the production had to be stopped. Since there was no planning, the maintenance professional, before correcting it, needs to understand the problem, check if the part can be replaced and if there is in stock. This situation will cause the company to make the machine unavailable, which will generate costs per machine stopped, part that needs to be replaced, and labor costs.

When performed without planning, corrective maintenance generates huge inconveniences, compromising the fulfillment of deadlines and especially operational profitability.

What is preventive maintenance?

When we talk about maintenance planning, one of the best paths to follow is certainly the preventive maintenance. It is the maintenance that corrects problems and failures even before they happen, thus reducing costs, machine unavailability, and increasing maintenance efficiency. Its main characteristic is the possibility of scheduling maintenance, avoiding problems with parts inventory, idle machines, and lack of production.

The tip we leave in this maintenance is to focus on the expected result, to evaluate the condition and operational reliability of the equipment, and not to focus only on the execution of the tasks pre-established by the planning. In an electrical machine, the electrical and mechanical tests and visual inspection are conditions to analyze its results and from there make a critical analysis and conclude potential problems and the degree of reliability that it is, that is, for this the presence of an electrical machine specialist is essential.

In the market we also commonly hear the term “rejuvenation” for preventive maintenance, which can lead to a misinterpretation. There is no way to rejuvenate what is already aging. We can prevent accelerated aging.

What is predictive maintenance?

It is safe to say that predictive maintenance is a step ahead of preventive maintenance. It is the most accurate follow-up and planning maintenance, requires greater qualification of the professional and aims to prevent any failure of parts before they even present a defect. It is characterized by monitoring equipment parameters, such as partial discharges, vibration, temperature, etc.

Predictive maintenance uses the monitoring of the parameters of the parts so that their replacement can be done before the end of their useful life. By inspecting the machine, the maintenance professional – based on the monitoring parameters – identifies the need to change components and schedules the best moment for maintenance, which is done without intervention in production, facilitating maintenance and avoiding higher costs with machine idleness.

What company wants to stop its production because of a failure or defect? Very similar to preventive maintenance, predictive maintenance has as a positive point the possibility of programming its actions. Planning and follow-up of the parts are important factors, which working together, reduce costs with losses and increase the effectiveness in the production of the machines.

NISHI offers solutions for all types of maintenance. Contact us and request an evaluation of reliability and operational warranty of your electric machine.

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In this week’s webinar we present the second part of the electrical test using the PDMA MCEMAX MCEGold® for off-line analysis.  In the video we perform a hands-on demonstration. We present how to identify broken bars in rotor cage performing the Rotor Influence Test and complete explanation about each type of off-line test.

GAP-N: Predictive Analysis of Electric Motors and Generators

Off-line testing:

Standard Test:

• Ohmic Resistance between Phases;
• Inductance between Phases;
• Insulation resistance corrected to 40ºC;
• Capacitance;
• Polarization Graphical Index;
• Step Voltage DC;
• Rotor Influence Test.

Watch the videos below via Nishi’s Youtube channel:

Webinar de ensaios elétricos GAP-N I PDMA MCEMAX®powered by MCEGold® PDMA OFF-LINE PARTE 2 de 2:

Webinar de ensaios elétricos GAP-N I PDMA MCEMAX MCEGold® PDMA ON-LINE PARTE 1 de 2:

Webinar de ensaios elétricos GAP-N I ENSAIO DE RESISTÊNCIA DE ISOLAMENTO:

Contact our team and request an assessment of your equipment’s operational reliability and avoid unplanned maintenance on your equipment.

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Induction motors have their stator winding divided into a number of poles (2; 4; 6; etc.) creating the rotating magnetic field and defining the synchronous speed in the stator. This rotating field induces voltages in the rotor generating currents in the rotor.

The field and current interacting with each other cause forces to arise that result in motor conjugate (torque), causing the rotor to rotate.

The rotor, if it turned at synchronous speed would have the same speed as the rotating field of the stator (inductor) and by the rules of induction there would be no induced voltage in the rotor and consequently no torque. The motor would stop spinning.

Normally it has a speed slightly lower than the synchronous speed and this difference, in percentage, is called slip. For small motors, the slip varies from 3 to 5% and less than 1% for medium and large motors.

Learn more about the services provided by Nishi and contact one of our experts for information about maintenance and characteristics of medium and high voltage induction motors.

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