The greater the complementarity between inductance and reactance, the easier it is to produce electrical resonance, and the professional saying will cause negative damping, which is simply resonance, and every middle school physics teacher will give an example when talking about resonance. A group of soldiers crossed a strong bridge and walked over normally, with inconsistent steps, without any danger, but they had to step through in a straight line with idle eggs, and each foot of each person acted on the poor bridge at the same frequency, and if this frequency happened to be the same as the natural oscillation frequency of the bridge, then a terrible resonance would have occurred, and the bridge would have been subjected to several times the pressure of the previous one, and might even collapse.

Electrical resonance is a complex version of the resonance, throughout the whole system, directly to the generator, when the electrical resonance frequency and the frequency of a mechanical torsional vibration in the large shaft of the turbine generator reach complementary conditions, subsynchronous resonance is generated, the hundreds of kilometers of accumulated offset energy, will suddenly find a breakthrough, crazy vent on this poor large shaft, this will be a blow to the generator, equivalent to twisting the human spine into twist.

Beimo will have a supercritical unit of hundreds of millions of yuan at every turn in the future, who would dare to let him bear the danger of twisting into a twist?

Especially in our country, everyone is promoted to make a fortune, all seek stability, so far only in the 110KV-330KV transmission line, with a very low compensation degree to test the water, in the face of 500KV ultra-high voltage transmission network, in the face of 600,000 kilowatts of supercritical units, even if Yue Yunhe dares, others dare?

One question and three questions, after such a complex thinking process, Zhang Yifu will answer two questions, the teacher in front coughed at this time, got up from his seat, and said loudly: "Collect the papers, stop writing." ”

This sentence is basically nonsense. Without half a person stopping writing, it is impossible for human beings to finish this volume, including Zhang Yifu.

The most critical third question, he was still blank, and when he looked up, it only took about 30 seconds for the teacher to walk here.

30 seconds of time. Talk about an effective way to suppress subsynchronous oscillations, and illustrate a 10-year argument?

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

30 seconds is enough time to write this one-of-a-kind......

But what is the significance of such a conclusion without argumentation?

In the end, Zhang Yifu silently picked up the pen and wrote down a line of simple and simple words.

[This is based on the research, practice, failures and successes of a generation. It's not just a student's talk. 】

Isn't it too pompous and forced?

In such a entanglement, Zhang Yifu still grabbed before the volume was taken away, and wrote [blocking filter] and [subsynchronous oscillation protection device], anyway, the conclusion is like this, I gave it to you, this question is too unreasonable for you, don't blame me for answering unreasonable.

The rolls were taken away, and everyone was like a fight.

The head oil man behind him was the first to hold his head and complained: "Teacher." The last question is too exaggerated, isn't it? This is obviously designed for people who are engaged in power transmission, and how to answer those who are engaged in power generation?"

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

"Ah......" The oily man scratched his head in embarrassment.

Sure enough, there were a lot of hateful or jealous glances around, and the little girl had done the last question. It's impossible to get a high score in an interview depending on your character.

At this time, the female teacher had already sorted out the papers collected by the male teacher, roughly clicked it, and then looked up and said, "There are still 18 people left, and this time the power system will recruit two people." I'll count if there are any people who have given up the interview, and I'll say it now, so that we can arrange the interview. ”

This female teacher is also personality enough, Zhang Yifu noticed that she belongs to a very delicate kind of person, both her figure and facial features are very small, thin and flat, with this personality and tone is really a bit scary.

This time, no one got up, and they have already insisted on this part, 1/9 of the probability! It seems that everyone is not answering well, maybe there is still a chance, and those who really don't know how to know how to do it at all have already handed in the papers and left.

"Come on. The female teacher held up the roll, 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 about it briefly." ”

When the female teacher left the classroom, everyone's pressure was reduced a little, and the male teacher was much softer, and introduced unhurriedly: "This time the situation is special and the time is tight, so we will not have an English interview, only the professional side." After a while, the interview teachers are in place, and you can go to the side for interviews one by one according to the exam number. The interview is divided into two parts, one is a drawing of questions, and the other is a question from the teacher. Draw three questions, you can answer them yourself, and you can answer the next one when you think you have finished answering. ”

The oily man didn't sound right, raised his hand and asked, "Didn't you smoke six in previous years?"

"This time, the time is relatively tight, so I will draw three questions first, and the teacher will decide whether to draw three more courses according to the general situation. ”

"What do you mean?"

It means that if the three questions are perfect, then there is no need to draw any more, and there is no need to draw any more questions, and when it is not sure, then draw three more questions to determine the result. ”

It seems that it is really to save time.

According to the spirit above, this part of the interview should be strengthened, the teacher may seem mean, and the speed of speech will be very fast, grasp your past experience, work performance and answer sheet, and quickly ask a series of questions. ”

"I know, it was like this last year, and it's generally difficult to play well. The oily man smiled embarrassedly, "By the way, is the female teacher just now also an examiner?"

"Yes, me too. The male teacher nodded.

Now the comrades' expressions are uncomfortable, and it is terrible to be tricked by the woman just now.

Some people who had more ideas also took the opportunity to look at Xia Xue, women should be more ruthless towards women, as one of the only remaining women present, this girl is afraid that this level will not be easy.

At this time, someone asked, "Excuse me, let me ask again, is Professor Yue interviewing in person or auditing?"

Professor Yue was also one of the interviewers. The male teacher smiled, "Don't be nervous, students, this is a selective exam, there is no absolute standard, try to relax your mentality, and play your due level." Professor Yue is also very good, even if you are nervous, he will gently guide you back to the state and show your true level. ”

The male teacher persuaded him like this, and most of them were much better, Professor Yue must be level-level, and he would not be as desperate as the dominatrix just now.

Within two minutes, the female teacher poked her head in, leaving only the words "come" and turned around and left.

The male teacher smiled helplessly, picked up the materials himself, and beckoned the person with the highest test number to go to the interview classroom with him, and said to everyone at the same time: "Everyone can wait here, leave directly after the interview, and there will be a phone call if there is news." ”

The first person was taken away, although the people present were almost 30 people, but here they were as simple as students, seeing that the teacher was gone, they quickly turned their heads and ears and became restless, the damn paper just now was too much to talk about.

Zhang Yifu also came to Xia Xue's side: "What's the matter?"

"Not good. Xia Xue showed a bitter expression for the first time, "I am not sure about several questions, and there is another question that I have never touched at all." ”

That is, this volume covers the teachings of at least 15 undergraduate textbooks. ”

"You know again?" Xia Xue snorted, "Looks like you answered well?"

"So-so, it's the last question I'm too lazy to answer. ”

"I didn't even think about the compensation, so I wrote all the nonsense I knew, and I guess it was all off topic. Xia Xue shook her head in distress again, "It's worthy of the exam of the Jinghua Electrical Department, I'm still far away." ”

"Not necessarily, there's no need to be presumptuous. Zhang Yifu patted her shoulder and comforted, "This paper is completely detached from actual work, too comprehensive and too detailed, those who are engaged in power generation are engaged in power generation, and those who are engaged in power transmission are engaged in power transmission. ”

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

"Then I'm different, I've never forgotten, I'm a genius in exams. ”

"Phew, why can't you speak English?"

"Geniuses are biased. ”

The two were chatting, and the first one who went to the interview had already returned, with a bitter face, and it only took six or seven minutes to go back and forth, and the outcome could be imagined. The second person in line hurried out of the classroom to make up for it, and the rest of the people rushed up, and they didn't plan to let the first person go.

"How's it going?"

People are so selfish, they don't think about the feelings of this master at all, and they care about the little things they care about.

NO.1 was besieged, and he couldn't walk, so he only said bitterly: "It's not easier than the written test." ”

"How many questions did you answer?"

Well, the person who asks this question is more selfish......

"Three questions, just one meeting, didn't let me answer the back. ”

"What about the teacher's question after that?" The oily man did not shy away from taking on this role that added fuel to the fire.

"Question...... Question ...... "NO.1 seems to have some kind of psychological shadow," "The woman, the woman who invigilated the ......"

He didn't finish speaking, picked up the bag on the table, covered his face, and turned to leave.

Everyone finally realized that some selfishness was excessive.

"Hey, that's it. The oily man shook his head disdainfully, returned to his seat, and saw Zhang Yifu and Xia Xue chatting together, quite affectionately, and couldn't help but think about getting closer, "You two...... Isn't it a target?"

Zhang Yifu raised his head to reveal a zombie face: "Friend, why do you inquire about everything?"

"I'm sorry, I'm sorry. The oily man shamelessly leaned next to the two, "I have anxiety before the exam, and I can't be idle." ”

"How long have you been on the exam?"

"Counting this year, it's about five years. The head oil man smiled indifferently, "Call me to the southern Yunnan side, I will be reviewing, year after year, year after year, year after ......year" (to be continued......)