On December 20th, the fourth keynote speech of the "20-year improvement plan" of energy efficiency electrical, which was also the first 20-year open class of Mr. Wang Jinjin, the founder and CEO of the company. This speech was broadcast live to the public for the first time, whether you are an energy efficiency person or not, you can listen to the same class and share new knowledge in the power electronics industry.
This course focuses on the high-frequency problems of power electronics hardware research and development, and the hard core shares the professional knowledge and theory of "grounding and measurement", and the speech is carried out in the form of a combination of offline and live broadcast, and all hardware, module software and test engineers of energy efficiency electrical participate in the training, and at the same time attract more than 1,000 viewers in the industry to listen to the lecture, and the live broadcast has received rave reviews and is very beneficial.
The essence of Mr. Wang Jinjin's speech is now compiled into a text, and a playback is attached at the end of the article.
Highlights of the 4th Grounding and Surveying Professional Knowledge and Theory Course
With the goal of "carbon peak and carbon neutrality" proposed, the construction of a new power system with new energy as the main body has become the top priority of China's construction of a new development pattern and comprehensive assistance to the energy revolution. This speech starts from the basic concepts, technical principles and operating mechanisms of the power system, analyzes the definition, technical and engineering application status, development prospects and trends of key technologies such as grounding grid, current sampling, small signal sampling, suspended voltage measurement, oscilloscope probe acquisition system in the research and development of power electronic hardware, and shares the principles and ways to overcome technical difficulties.
Power system
Taking the power system and power grid of the Three Gorges Power Plant as an example, it is pointed out that the core of the entire power system is step-up and step-down. The transmission network is compared to the "main artery" and the distribution network is compared to the "capillary" to understand the high-voltage and low-voltage power transmission mechanism.
Earth, grounding grid, body ground
The concepts, technologies and differences between the earth, the grounding network and the body ground are elaborated in detail. Relevant problems and solutions are proposed for the current flow direction of the ground grid and PE.
Grid grounding type
This paper lists five types of power grid grounding types: TN-S system, TN-C-S system, TN-C system, TT system and IT system, analyzes their advantages and disadvantages, focuses on the reason why TN-C-S is a high-current grounding system, and intuitively explains the key points of the grounding detection circuit with circuit diagrams.
Class I devices and Class II devices
This paper focuses on the insulation systems of Class I, Class II, and Class III equipment that each obtains anti-electric shock protection performance, and explains the difference between basic, additional, double, and reinforced insulation. The term and definition of "current" in safety regulations were popularized.
The relationship between the oscilloscope probe acquisition system and ground
Explains the minimalist working principle of an oscilloscope, summarizes the three characteristics of an ideal probe, and points out that no matter what type of probe is used, any measurement is essentially a differential measurement: ground is a reference point.
6 Basic Principles for Capturing Cash Flow with High Fidelity
The 6 basic principles of high-fidelity capture are summarized in detail: choosing the right bandwidth, minimizing quantization errors, always being vigilant about the sampling rate, capturing the full picture of the signal, reducing the influence of the probe, and using special acquisition modes. At the same time, the influence of bandwidth on measurement, the influence of probe on measurement, and how to choose bandwidth are analyzed.
Mr. Wang Jinjin recommended a professional reading list to help everyone learn and master the grounding technology of low-voltage electrical and power system more deeply.
Twenty-year improvement plan for energy efficiency electrical
On September 20, 2023, Energy Efficiency Electric launched the "Twenty-Year Improvement Plan". On a voluntary basis, each energy efficiency electrical engineer chooses the same topic and continues to lecture for 20 years. The sharing time is 19:00-22:00 on Wednesday of the third week of a month.
Three sessions have been launched in September 10, 2023, and the three colleagues of Energy Efficiency Electric have made a 20-year commitment to improvement. Topics that have been selected so far include:
Transformer Principle and Design Essentials";
Digital Control of Switching Power Supplies: Theory and Practice from Hardware to Software";
LLC Principles and Transformer Design.
On December 20th, Mr. Wang Jinjin, CEO of Energy Efficiency Electric, broadcast the fourth lecture on the whole network.
The core values of Energy Efficient Electric
People are everything. People and platforms make each other better.
People |Be keen to learn, have the courage to struggle, and take growth as a lifelong mission.
Platform |Openness, transparency, sharing, mutual achievement.
Energy Efficiency Electrical's 20-year improvement plan "Grounding and Measurement".