July 29 (Wed) Zoom Seminar: "Practice of AC/Impulse Insulation Performance Evaluation Based on Thermal Countermeasures, High-Voltage Insulation Technology, and IEC International Standards ~ Partial Discharge Measurement for Automotive/Industrial Motors, Coils, Power Semiconductor Modules, Circuit Boards, etc."

AndTech Co., Ltd. (Headquarters: Kawasaki City, Kanagawa Prefecture, President and Representative Director: Masao Suyama, hereinafter AndTech) will explain the latest trends in high-voltage insulation technology as part of its R&D development support.

We will thoroughly explain high-voltage insulation technology, starting from the basics of electrification!

We will explain practical examples of measurement and quality evaluation technology for various electrical insulation properties of high-performance resin materials (pressed resin, cross-linked fluorine, high thermal conductivity nanofiller filling, etc.).

As one of the highlights of this lecture, we will introduce a practical example of an impulse insulation evaluation test for an actual EV hairpin stator, which is generally not publicly available.

Live Distribution / WEB Seminar Training Course Overview

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Theme: Practice of AC/Impulse Insulation Performance Evaluation Based on Thermal Countermeasures, High-Voltage Insulation Technology, and IEC International Standards ~ Partial Discharge Measurement for Automotive/Industrial Motors, Coils, Power Semiconductor Modules, Circuit Boards, etc.~

Date and Time: July 29, 2026 (Wednesday) 10:30-16:30

Recording Viewing: Available

Participation Fee: 49,500 yen (tax included) * Materials will be distributed electronically.

URL: https://andtech.co.jp/seminars/1f144f69-5474-62e4-8e22-064fb9a95405

WEB Distribution Format:

This will be a live seminar using the web conferencing tool "Zoom."

Details will be provided after registration.

Seminar Training Course Content Structure

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Professor Emeritus, University of Hyogo: Masayoshi Nagata

Knowledge and Technical Issues That Can Be Learned and Solved in This Seminar

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① Latest trends in the development and application of resin materials and high-voltage insulation technology in the field of electrified mobility

② Challenges and countermeasures for high-voltage insulation towards higher voltage, higher frequency, and thermal countermeasures for each electrified component

③ AC/Impulse insulation performance evaluation methods for resin films, coils, inductors, varnish, busbars, power semiconductor modules, and high-frequency printed circuit boards

④ Challenges and adaptation methods of IEC international standards for electrical insulation systems

⑤ Partial discharge measurement methods under severe environmental conditions (high temperature, high humidity, low pressure) at high voltage and high frequency

⑥ Impulse insulation evaluation method for industrial inverter-driven motors compliant with IEC standards

⑦ (Must-see!) AC/Impulse insulation evaluation method and insulation weak points of actual EV hairpin stators

All Program Items Below (Please take a look if you are interested in the details)

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[Lecture Points]

We will explain the basics of electricity, the principles behind the background, the mechanisms of phenomena, and prediction methods in a way that anyone can understand. Furthermore, we will provide detailed explanations with several specific examples to help you put them into practice.

[Program]

1. Latest Trends in Electrical Insulation Technology and Development of High-Performance Insulating Materials

1.1 Technology trends towards smaller, lighter, and higher-voltage EV/HEV drive motors

1.2 Thermal and insulation technology trends for reliability design and evaluation of electrified components

1.3 Development trends of high-performance resin materials for high heat resistance and high thermal conductivity

2. Basics of High-Voltage Insulation Technology

2.1 Electrical insulation technology for high-voltage equipment (high-voltage transformers, trains, automobiles, etc.)

2.2 What is the difference between AC and pulse/impulse?

2.3 What is the thermal problem that rapidly degrades resin materials?

2.4 What is dielectric breakdown? What is the difference between dielectric breakdown voltage and discharge inception voltage?

2.5 What are the discharges that lead to dielectric breakdown (partial discharge, barrier discharge, creepage discharge, corona discharge)?

2.6 Why does partial discharge (PD) become more likely to occur with higher voltage and higher frequency?

2.7 PD generation mechanism that changes significantly with the surrounding environment (temperature, humidity, pressure, radiation)

2.8 Where is PD likely to occur? Focus on countermeasures for weak points in insulation (triple points, near infinite electric field strength)

2.9 Why is an evaluation test using an impulse voltage waveform, which differs from conventional AC tests, necessary?

2.10 Key points for reading the property table of resin materials, and how to measure thermal and electrical properties?

2.11 What is the complex degradation mechanism of resin materials?

2.12 What is the mechanism of high thermal conductivity and long life characteristics of nanofiller-filled resin materials?

2.13 Relationship between insulation structure and thermal resistance of power modules, etc., and thermal/insulation degradation mechanism

2.14 How to accurately measure the voltage at which weak partial discharge occurs (PDIV)?

2.15 PD becomes more likely to occur with thermal degradation. Can the degree of degradation and life be predicted by the decrease in PDIV?

2.16 What is the existence probability of initial electrons and the Volume-time theory that determine PDIV?

2.17 How to predict PD occurrence? – Essential knowledge for insulation design –

2.18 How to measure PD occurrence? – Essential measurement technology for product quality assurance –

3. Electrical Insulation Evaluation Methods Based on IEC International Standards

3.1 Related IEC standards for inverter-driven motors

3.2 Standards for evaluating thermal durability and life of electrical insulation systems

3.3 PDIV measurement and life evaluation test for magnet wires (round wire twisted pair, rectangular wire arrow pair)

3.4 PD-Free verification method for drive motors (between phases, to ground, between turns)

3.5 How to determine the impulse test voltage according to the surge stress level

3.6 Application and challenges of IEC international standards for EV hairpin motors

3.7 Measurement methods for dielectric breakdown voltage, tracking index, dielectric constant, and dielectric loss tangent of insulating materials

3.8 Standards for insulation evaluation of power modules

4. Partial Discharge Measurement and Practical Examples of AC/Impulse Insulation Evaluation Methods for Each Component

4.1 Differences between AC testers and impulse testers (introduction of commercially available measuring instruments)

4.2 Selection of power supply (AC, impulse) and various measurement sensors

4.3 Experimental equipment, test environment settings, measurement methods, etc.

4.4 Causes and countermeasures for data variability

4.5 Relationship between applied voltage waveform (rise time, pulse width, frequency) and PDIV characteristics

4.6 Sensor sensitivity, noise level, and threshold settings that affect measurement values

4.7 Specific examples of impulse voltage application methods, data collection, and processing methods

4.8 Specific examples and precautions for measuring temperature and humidity dependence of PDIV using a constant temperature and humidity chamber

4.9 Example of AI-based method for determining the location of partial discharge

4.10 Sample shape, PDIV measurement, and life test for magnet wires (round wire, rectangular wire, edgewise winding wire)

4.11 PDIV/RPDIV measurement of PEEK pressed thick film and PI thick film enamel rectangular wires

4.12 Temperature dependence of PDIV/RPDIV of resin films

4.13 Impulse partial discharge measurement for evaluating varnish performance

4.14 Partial discharge measurement on printed circuit boards using high-frequency voltage

4.15 Partial discharge measurement of semiconductor power modules

5. Practical Examples of Insulation Evaluation Tests for Actual Inverter-Driven Motors

5.1 Insulation evaluation test for industrial motors compliant with IEC international standards

5.2 (Must-see!) Impulse insulation evaluation test and insulation weak points of EV hairpin stators

6. Summary