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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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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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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“Partial Discharge” and “Corona” are terms commonly reported in the electrical and maintenance fields, they are commonly confused as being similar terms. They have in common that they do not immediately cause a complete path in the dielectric for the electric current.

According to the IEEE, a partial discharge is an incomplete or “partial” discharge that occurs between insulators and also between conductor and insulator. In contrast, a full discharge is one that crosses the space between conductors, causing what is known as an electrical fault, by forming a conductive bridge.

Corona, on the other hand, occurs when the gases adjacent to an energized conductor ionize and produce normally visible discharges. Thus, partial discharges inside the insulating wall cannot be called corona.

Visit our Predictive Maintenance page and contact our team for more information on partial discharge monitoring and predictive diagnostics. Evaluate the advantages of unscheduled shutdowns, reducing costs in equipment maintenance and increasing the efficiency of the production process.

*Illustrative images taken from the IEC 60034-27-2 standard.

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Watch the video below with engineer Fábio Toshio performing an insulation resistance test. He comments on the main points of attention for proper execution and interpretation of applied standards and test results:

• Applicable standard IEEE Std 43:2013 – Recommended Practice for Testing Insulation Resistance of Rotating Machinery;
• Stress levels;
• Acceptance criteria;
• Polarization Index;
• Cautions that interfere in the measurement.

Learn more about our products and services for predictive and preventive maintenance of motors and generators. Contact our team and request an evaluation of your maintenance scope.

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In this week’s webinar we present the electrical test using the PDMA MCEMAX MCEGold® for on-line analysis of motors.  In the video we perform a practical demonstration of performing an online test with expert explanation and commentary.

GAP-N: Predictive analysis of electric motors and generators

On-line tests:

• Partial discharges;
• Vibration analysis;
• Thermography;
• Power quality analysis;
• Current spectral analysis;
• Inrush current monitoring.

Watch the video on Youtube:

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

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 ENSAIO DE RESISTÊNCIA DE ISOLAMENTO:

Contact our team and request an assessment of the operational reliability of your equipment and avoid unplanned maintenance and decrease the downtime of your equipment.

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Through this monitoring, the maintenance management may be able to foresee possible failures and malfunctions, reducing the probability of performing corrective maintenance. Consequently, optimizing the operational availability of the equipment, increasing productivity and reducing the cost of operation.

It is noteworthy that the performance of predictive maintenance does not exclude the need for preventive and corrective maintenance. Thus, it aims to reduce the number of unexpected failures and provide complementary information for preventive maintenance.

Thus, the main benefits of a maintenance management that uses predictive maintenance in its programming are:

• Reduction of maintenance costs;
• Increase in the mean time between failures;
• Reduced machine repair time;
• Increased productivity, availability and reliability of the machine;

Read more Nishisan tips in our BLOG and access the content of a lecture held by NISHI about the Effectiveness of Predictive Analysis: Expertise + Technology. Contact our team and evaluate your maintenance strategies with information and data collected.

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See below the slides of the presentation:

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