At this moment, two teachers, one man and one woman, entered the classroom with thick sealed bags. The male teacher was responsible for unpacking and the female teacher was responsible for the examination room instructions: "Everyone must have understood the examination arrangements. I will reiterate that the math and English test will be taken in the morning, politics and majors in the afternoon. The re-examination of this exam will be held together. The written test will be completed at 4 o'clock. Don't rush to leave and wait for the interview arrangement."

"Is the interview the same today?" asked the middle-aged oily man in surprise.

"Professor Yue will be on a business trip tomorrow. It may be late until today. I'll forgive me."

There was a commotion in the classroom in an instant.

After all, except for Zhang Yifu and Xia Xue, the rest of them have hardly contacted Yue Yunhe and have never said goodbye. It is undoubtedly a good thing to have the opportunity to meet and chat today. We must leave a good impression on the professor.

In such confusion, Zhang Yifu began to answer the paper.

After getting the math test, I have to say that Xia Xue’s review is so effective. She is simply the queen of the exam. Most of these questions seem familiar, and Xia Xue’s essence question bank is simply cool.

There is definitely no problem with passing the exam, so try to reach an average level.

After taking the math exam, Zhang Yifu, Xia Xue and the oily man probably got the answer right, and it should be able to reach the average level. However, the oily man seemed to perform better than himself, but he still couldn't compare with Xia Xue.

Then there was Tiansha's English. After a confused chapter, Zhang Yifu had to pray for passing the exam.

I didn’t have much lunch time, so I found a casserole restaurant at school to deal with it.

After noon, he forced his political exams in the lazy sunlight. Politics was easier than Zhang Yifu thought, because these things are just coming and going. He used "Marx's theory" to prove everything. There were even a lot of things in the question bank in his mind. It must be not difficult to reach the average level by relying on micro cheating.

Finally, the professional test paper was finally ushered in, this test paper covering motors, power and engineering.

Zhang Yifu and Xia Xue are undergraduates in the power system, and they have some knowledge about these aspects. But they are not very in-depth, which must be the place where Xia Xue pays the most attention to. Zhang Yifu focuses on the most. She glanced at the surface of the paper, because it was the direction of the power system, and the content involved in machinery and power was limited. Zhang Yifu felt a little at ease, and Xia Xue should be able to deal with it.

This professional test question is actually the content of the re-examination.

In the first exam, mathematics, English and politics, those who pass the line participate in the re-examination, and the re-examination includes professional written tests and interviews.

The core of the test is actually the score line.

The general way of playing is this. First, then set the score line, based on everyone's scores and a certain proportion of the number of students enrolled. The key here is "a certain proportion", because a certain proportion is not a certain proportion, and Chinese is always so profound. Considering the worst situation, if Jia Tianyun refers to it and wants to ensure that she is admitted, then the score line for the first exam is almost Jia Tianyun's total score. If she gets 0 points, the proportion is 100%. Then all the staff will happily pass the first exam.

In this way, the re-examination will be easier. As soon as Grandma Jia appears, all the mentors surrender and give them full marks.

So for Zhang Yifu, this professional written test paper is more important than the previous test papers. The score line of the preliminary test will definitely be stuck with your own score. You must get a good score for this re-examination professional question. Otherwise, it will be too embarrassing for Lao Yue.

On this paper, there are no choices or judgment questions. They are all subjective questions, and they are all hard knowledge and no luck factor.

The beginning of the book is a series of gratitude questions, and the first one is easy to make people panic-

【Brief description of electrostatic shielding, electromagnetic shielding and magnetic shielding】

First of all, this question makes people feel numb. After Zhang Yifu exhausted all his strength to write the answer, he still felt numb when he saw the answer he gave. No one except professionals could understand it.

[What are the four parameters of the equivalent circuit of the transformer and how to obtain it through the test]

This is a bit simpler, but still a big hit. Are these two simplest questions in the Jinghua Electrical Department’s professional test questions... If you don’t memorize all the basic teachings, you can’t answer these terrible detailed feelings. Even Zhang Yifu can’t rely on regular memory to complete it, and you have to use the "computer". Exams and work are really different things, absolutely two things.

Before I finished answering the concept questions, three or five people had already handed in the paper. It was obviously unrealistic to finish these questions in 10 minutes. If you wait and see their painful expressions, it is obvious that almost no question can be done and I give up.

This is normal. After all, they were reviewing the unified examination before. For regular examinations, they had to wait until the unified examination passed before taking the professional course. Many people who met the conditions for the examination may not be motor majors, but just came to try their luck. As soon as they got on the mobile phone questions, they were blown up.

After receiving these few papers, the female invigilator said helplessly: "Professor Yue has high requirements for his major. No matter how outstanding the Master and English are, he will not be able to answer the major well. These questions are the simplest. The subsequent interview is a high-pressure question. If this paper cannot be answered 70%, I personally suggest that you can submit the paper in advance."

Many people seemed to have been stabbed, showing a painful expression.

The male teacher frowned and said, "It's not that exaggerating, can you fight for it?"

"Isn't this saving time?" the female teacher continued, "I know that most of you come to test your luck after taking the unified examination. Perhaps the unified examination is not a major in motors. Professor Yue said it very clearly that at most two people are accepted. If he is not satisfied, he may collect them next year."

The male teacher shook his head and said no more.

In fact, the threat of the female teacher is very meaningful. After she spoke, seven or eight people chose to give up, and in the end less than 20 people chose to insist on answering the questions.

The female teacher then smiled satisfactorily, controlled the number of people who were interviewed, and could get off work early.

Zhang Yifu is also a person who has experienced national competitions, but answering these questions is more difficult. The reason is very simple. This paper focuses more on theory and in-depth, while the national competition focuses on practice. Many of them are problems encountered at work and more conventional problems.

I tried my best to get to the last question, but there was not much time left.

Unexpectedly, the last question was not a drawing question or a calculation question, but an essay question! This saved Zhang Yifu a lot of effort.

When Zhang Yifu looked at the topic narration again, he couldn't help but be stunned.

How is it possible? How can anyone answer such a question?

The reason is very simple... because even Yue Yunhe himself doesn't have a standard answer to this question, because this question belongs to the future.

The question is divided into three questions.

[1: Please briefly describe the significance and principle of series capacitor compensation]

[2: Please briefly describe the difficulties in series capacitor compensation in application]

[3. Assuming that a power plant has an 8x600mw supercritical unit, in order to improve the transmission capacity, a capacitor compensation device is installed on three 500kv transmission lines, with the series compensation of 35%, 40%, and 45%, respectively. Please try to propose a suppression plan for the 600mv unit of the power plant for sub-synchronous oscillation.]

Just like these three questions, the unrealistic aspects of this question are also sublimated with each question.

The first question is series capacitor compensation. First of all, this is a niche and unpopular and highly professional power transmission technology that is almost blank in China. Even the top student Xia Xue may not know this concept.

Second, I asked about the difficulties in the application. This is a further conversation. There is no application in China. How can I talk about the difficulties?

The third question... Looking at the parameters and configuration, isn't it just Beimo Thermal Power Plant? A power plant that has not been built yet! How can this scale be involved in the textbook?

Let’s talk about how to solve the impact of series capacitor compensation during power transmission. This is what Yue Yunhe should study, what transmission experts across the country need to study, and a major problem that needs to be solved in the next three years.

How could humans answer?

Of course, some people can answer, such as the chief engineer of the American Electric Power Company, the doctoral supervisor of MIT, etc., but they are already non-human, and they are still thousands of miles away. How could they come to take this exam in a free time?

There is only one answer.

This question was tested by Yue Yunhe for Zhang Yifu, and he was the only one to see if he could talk about the most difficult point in his future work.

Zhang Yifu was also in a dilemma. If I asked me to talk, I would definitely be able to talk. I would not care about showing my superman talent. The problem is... this matter is enough to write a paper, and 50,000 words may not be able to talk thoroughly.

The issue of series capacitor compensation can be referred to as series compensation. When Zhang Yifu met Pang Bayi and others in the department, it was already proposed that this is a technical means to improve the efficiency of AC transmission, but it is also a double-edged sword. If the problem of sub-synchronous oscillation caused by series compensation is not effectively handled, it will have a devastating blow to the large shaft of the steam turbine generator. The Americans have lost several supercritical units because of this.

In our country, we have always pursued stability. Therefore, even though this technology has been around for more than 20 years, we have never dared to use it for stability because of risks. If the transmission efficiency is low, it will be low. After all, the large shaft is the most important core part of the generator set, and no one can bear the responsibility if it is damaged.

But in the end, technology needs to be improved and efficiency needs to be improved. The situation in our country itself is that natural resources are unevenly distributed, and power plant configuration must be uneven. There is a great requirement for long-distance power transmission, especially the power generation of Beimo is so huge. A considerable number of power plants directly supplied to Jijing are unreasonable without considering efficiency. Besides, international replenishment technology has become more mature, and as a power power country, we should not leave it behind.

Therefore, in Beimo's argumentation report, it was proposed for the first time that the use of a series of supplementary technology in power transmission projects was adopted. Yue Yunhe was obviously a person who could take the blame.
Chapter completed!