The greater the complementarity between inductor and reactance, the easier it is to generate electrical resonance. Professional statements will trigger negative damping. Simply speaking, resonance. When talking about resonance, every middle school physics teacher will give an example. A team of soldiers passes through a solid bridge and walks over normally. The pace is not uniform and there is no danger. But they have to rush forward in line with pain. Each foot of each person acts on the poor bridge at the same frequency. If this frequency happens to be the same as the inherent oscillation frequency of the bridge, then a terrible resonance will occur. The bridge will bear several times the pressure before, and may even collapse.

Electrical resonance is a complex version of resonance that runs through the entire system and directly vibrates to the generator. When the electrical resonance frequency and the frequency of a mechanical torsional vibration in the large shaft of the steam turbine generator meet the complementary conditions, sub-synchronous resonance is generated. The offset energy accumulated over hundreds of kilometers will suddenly find a breakthrough and vent it frantically on this pitiful large shaft. This will be a devastating blow to the generator, which is equivalent to twisting the human spine into a twist.

In the future, Beimo will have supercritical units that are often hundreds of millions of yuan. Who dares to let him bear the danger of twisting into a mess?

Especially in our country, everyone is promoted and wealthy and seeks stability. So far, they have only tried water with very low compensation in the 110kv-330kv transmission line. Facing a 500kv ultra-high voltage transmission network and a 600,000 kilowatt supercritical unit, even if Yue Yunhe dares, will others dare?

One question and three questions. After such a complicated thinking process, Zhang Yifu answered two questions. The teacher in front coughed, got up from his seat, and said suddenly: "I have finished the script, stop writing."

This sentence is basically nonsense. Without half of the person stopping writing, it is impossible for humans to complete this paper, including Zhang Yifu.

The most critical third question was still blank. Looking up, it only took about 30 seconds for the paper-collector to get here.

In 30 seconds, we will talk about effective methods to suppress sub-synchronous oscillation. Explain a 10-year argument?

There are many methods, but few are effective, and there are almost only one efficient one.

30 seconds is enough to write this only one...

But what is the significance of this unargued conclusion?

Finally, Zhang Yifu silently picked up his pen and wrote a line of simple and simple words.

[This must be achieved through the research, practice, failure and success of a generation, rather than a piece of empty talk by a student.]

Isn't it too exaggerated?

In such a tangle, Zhang Yifu still wrote the [blocking filter] and [subsynchronous oscillation protection device] before the paper was taken away. Anyway, this is the conclusion, I gave it to you. You gave it to it too unreasonable, so don't blame me for answering it unreasonable.

The papers were taken away, and everyone seemed to have fought a war.

The oily man behind him was the first to hold his head and complain: "Teacher, the last question is too exaggerated, right? This is obviously designed for people who are engaged in power transmission. How do you answer the power generation?"

"What's the point of answering all the questions?" said the female teacher angrily, "I just read this test, and it's good to pass the test. It's okay to have time to read the last question, but you don't have to show off like this, right?"

"Ah..." The oily man scratched his head awkwardly.

Sure enough, there were a lot of hatred or jealous eyes coming around, and Xiaoya’s got the last question? Well, it’s impossible for you to get a high score in the interview, depending on your virtue.

At this moment, the female teacher had already sorted out the papers collected by the male teacher, clicked about it, and then looked up and said, "There are 18 people left. This time, the power system recruits two people. I'll count them. Have anyone given up the interview? Let's say it now so that we can arrange the interview."

This female teacher is also very unique. Only then did Zhang Yifu notice that she is a very delicate person. She has small, thin and flat figures, and her personality and tone are really scary.

No one got up this time, and he has been on this position. Is it a 1/9 chance? It seems that everyone has not answered well. Maybe there is still a chance. People who are really not very good at all have already handed over the person.

"It's done." The female teacher raised the paper, stuffed it into a cowhide envelope in public, and then said to the male teacher, "I'll call a few teachers to prepare for the interview, you can talk briefly."

When the female teacher left the classroom, everyone's pressure was relieved, and the male teacher was much softer. He introduced slowly: "This time, the situation is special and the time is tight. We don't have an English interview, so we only have a professional course. After a while, the interview teachers will be in place. Just go to the next interview one by one according to the exam number. The interview is divided into two parts, one by one, one by the teacher's question. If you draw three questions, you can just answer the next one by yourself. You think you have finished answering the answer."

The oily man heard something wrong and raised his hand and asked, "Didn't he draw six ways in previous years?"

"This time is tight, so I'll draw three more first. The teacher decides whether to draw three more according to the general situation."

"What does it mean?" Many people asked questions.

"It means that if all three paths are perfect, then there is no need to draw any more. If all three paths are not available, there is no need to draw any more. When it is impossible to determine the results, then draw three more paths to determine the results."

It seems that it really takes time to save.

"There is a brief discussion on the teacher's questioning session. According to the spirit of the above, this part of the interview should be strengthened. The teachers may appear mean and speak very quickly. Grasp your past experience, work performance and answering questions, and quickly ask a series of questions."

"I understand this, it's like this last year, and it's usually difficult to perform well." The oily man smiled awkwardly, "By the way, is the female teacher who just now also an examiner?"

"Yes, so do I." The male teacher nodded.

The comrades' expressions were so uncomfortable now that they were tricked by the woman just now. This was so terrible.

Some people who have more ideas also took the opportunity to look at Xia Xue. Women should be more ruthless to women. As one of the only remaining women present, this girl is probably not easy to pass this level.

Now someone asked again: "I bother the teacher, ask again, is Professor Yue interviewing or attending the interview?"

"Professor Yue is also one of the interview teachers." The male teacher smiled, "People don't be nervous either. This is a selective exam. There is no absolute standard. Just relax your mindset and show your due level. Professor Yue is also very good. Even if you are nervous, you will gently guide you to return to your state and show your true level."

After the male teacher advised him, most of them were much better. Professor Yue must be of high quality and would not be as dead as the female yaksha just now.

Within two minutes, the female teacher leaned in, left the word "Come on" and turned around and left again.

The male teacher smiled helplessly, picked up the materials and called the person who was the one who had the most exam numbers to go to the interview classroom with him. At the same time, he said to everyone: "Everyone just wait here. After the interview, leave directly. If there is any news, there will be a phone notification."

The first person was taken away. Although everyone present was almost 30, they were all as simple as students. When the teacher left, they quickly whispered and got restless. The damn paper just now was so much talked about.

Zhang Yifu also came to Xia Xue's side: "How is it?"

"Not good." Xia Xuetou showed a bitter expression at one time. "I was not sure about several questions, and I had never touched the concept of the question at all."

"That's right, this paper covers at least the content of the teachings of 15 undergraduate textbooks."

"Did you know again?" Xia Xue snorted, "It seems that you have a good answer?"

"I'm too lazy to answer the last question."

"I didn't even consider the compensation level, so I wrote down what I knew. I probably missed the question." Xia Xue shook her head in distress again, "It's worthy of being the exam for Jinghua Electrical Department, I'm still far from it."

"It's not necessarily that there is no need to underestimate yourself." Zhang Yifu patted her shoulder and comforted her, "This paper is completely out of actual work, too comprehensive and detailed. Those who do power generation are power generation, and those who do power transmission are power transmission. I have never heard of anyone who knows everything. It is impossible to know the technical details of the ultra-high voltage power grid. The maintenance of Xiaxiao Power Plant units is useless, and the Minister of Electricity is useless, and Yue Yunhe is useless."

"What about you?" Xia Xue asked, "Have you answered?"

"Then I'm different. I'll never forget it. I'll take the exam genius."

"Ph! Then why can't you speak English?"

"Genius is a genius."

The two were chatting. The first person to go to the interview had already returned, with a bitter face. One trip was only six or seven minutes, and the ending was imagined. The second person quickly left the classroom and made up, while the rest rushed forward, without intending to let the first person go.

"How is it? Is it difficult?"

People are so selfish. Now they don’t consider the feelings of this master at all, but only care about the things they care about.

no.1. He was besieged and could not leave anymore. He could only say bitterly: "It's not simpler than a written test."

"How many questions have you answered?"

Well, the people who ask this question are more selfish…

"Three ways, just one way, I didn't ask me to answer the next one."

"What about the teacher's question later?" The oily man took on the role of adding fuel to the fire without hesitation.

"Ask... Ask a question..." no.1 seemed to have some psychological shadow, "That woman, the woman invigilator..."

Before he finished speaking, he picked up the bag on the table, covered his face, turned around and left.

Everyone finally realized that it was too selfish.

"Hey, that's all the strength." The oily man shook his head disdainfully and returned to his seat. Seeing Zhang Yifu and Xia Xue getting together and chatting, they were quite intimate, and couldn't help but think about it and get closer, "Are you two...are you a partner?"

Zhang Yifu looked up and showed a zombie face: "Friend, why are you asking for everything?"

"Sorry, sorry." The oily man shamelessly approached the two of them, "I can't get free before the exam."

"How long have you been taking the exam?"
Chapter completed!