Although the climate is the mildest time of the year, the atmosphere at the switch insulation test site is like an ice cellar.

The testers slowly packed up the wiring, not daring to look up, not to look at others, and even more so at their own factory director. And Miyanderin's cannon had long been dumb, and he couldn't say half a word anymore, so he drooped.

"The insulation test has been carried out. Ou Wei said unhurriedly, "Whether it is the switch itself or the insulating oil inside, the qiē index is normal, and it is within the standard value limit." ”

As he spoke, he walked up to Miao Delin and patted him on the shoulder very lightly: "Old Miao, if you make a mistake, you have to have the courage to admit it, do you remember anything now, you just forgot what you said?"

Mildlin didn't speak, and he couldn't speak.

Ou Wei had no choice but to turn to the others: "Then the rest of the comrades of the Fengzhou Power Plant, do you have anything else to say? In our accident investigation, we have always had to fully understand the situation, find out the causes, and distinguish the responsibilities. "Three don't let go" everyone should know that there is no * wrong * way, that is, the cause of the accident is not clear, the measures are not clear, and the personnel are not educated (that is, handled). Although the responsibility has been unavoidable, it is necessary to take the initiative to make it clear, and the importance of handling it can be considered. ”

The section chiefs and the workshop director looked at each other, but in the end, no one came forward.

"Hey...... In that case, let's go back to the conference room first. Ou Wei shook his head, ready to take the lead towards the office building.

At this moment, Nangang turned back and stopped the flow of people: "Wait a minute, there seems to be something new on Zhang Yifu's side." ”

"Zhang Yifu?" Ou Wei was stunned for a moment, and looked around left and right. didn't find Zhang Yifu, "Director Nan, didn't you just say that he had heat stroke?"

"It's okay, he and Xia Xue seem to be a little present, let's go, go to the explosion site over there." "Nangang definitely didn't know what was going on, so he had to lead everyone over.

The group was full of questions, all the tests that can be done now have been done, there is no problem, what else can Zhang Yifu show? This is the first time this kind of survey has been conducted.

With such doubts. Everyone gathered at the scene of the explosion, and Zhang Yifu had already gathered several sections of insulating tie rods together, waiting for the arrival of visitors.

Everyone looked at the broken lever that they had already observed, and they were still confused.

"Alright. It's all here. You say. Nangang waved his hand. "I hope your conclusions will be accepted by the investigation team. ”

"Hmm. Zhang Yifu coughed his throat, glanced around the crowd, and finally fixed his eyes on Miao Delin. "Director Miao, think about it, do you have any details to add, and are there any omissions or contradictions in the situation you described?"

Asking this sentence is purely to do Lao Niu a favor.

Miao Delin looked at Zhang Yifu's determined expression, and beat a drum in his heart, but in the end he shook his head, and said in his heart, You are a technician and you are not an immortal, how can I be bluffed by you?

He only shook his head and said, "Everything that can be said has been said, and it is all the truth." ”

"Okay. ”

Now that he gave up the last chance, Zhang Yifu doesn't have to be polite.

He then looked at the others, and said categorically, and directly said the conclusion.

"This failure was caused by a poor seal of the switchgear and had nothing to do with the operation. ”

This time I was really stunned, even Miao Delin was stunned, you were obviously denouncing Lao Tzu just now, why are you helping Lao Tzu wash your name now?

There were no fools in the audience, and no one would ask Zhang Yifu where he got the courage to speak wildly, he dared to say so, there must be a reason, they all looked at Zhang Yifu, waiting for him to talk.

If there is any high-minded talk, on-site analysis is enough.

"Ladies and gentlemen, please look down at the four-stage lever in front of you. Zhang Yifu's right arm pointed to the poor metal lying flat on the ground, "Through this, you can actually deduce the accident process." ”

Everyone lowered their heads, and Nangang squatted down directly and looked at the scrap iron.

"Zhang Yifu, are you talking about these bulges on the surface?" said an old comrade from the power plant, raising his glasses, "This should be caused by the high temperature in the explosion." ”

"You said the opposite, it was precisely because the insulating tie rod was at high temperature that it caused the explosion. Zhang Yifu squatted in front of everyone and pointed to the protruding bubble on the insulating tie rod, "This is the blistering phenomenon, which is usually a flashover, judging from the blistering distance and density of this tie rod, the flashover at that time should not be light." ”

"Flashover?" said the other man, rubbing his chin in surprise, "Flashover does cause blistering, but blistering doesn't have to be flashover, right?"

"There is another key point. Zhang Yifu scolded Xia Xue.

There was no way, Xia Xue had to pick up one of the levers to show it, and stretched out her finger to point to the black line at the top: "Here are obvious blackening marks, high temperature traces." ”

Everyone looked at each other, and finally this little thing appeared.

In the previous rough survey of the site, everyone's attention was focused on the fuel tank and arc extinguisher, and for other tie rods and the like, at most, they took a closer look at the contacts, and no one paid attention to this inconspicuous tie rod.

At a glance, this black line appeared.

Ou Wei took the lead in asking: "This is the fire caused by the oil surface, right?"

Xia Xue shook her head, she never gave face when she spoke: "Or is it the other way around, it is the high temperature of the insulating tie rod and the vaporization of the oil surface of the insulating rod, and it is unlikely that the insulating oil will burn directly, Director Ou." ”

Being said like this, Ou Wei was quite embarrassed that a recent graduate actually found fault with his professional knowledge. But he looked left and right, and no one refuted Xia Xue, so he couldn't fight anymore.

"Well, even if there is a fire and explosion, it is in the arc extinguishing chamber. The old comrade of the power plant pondered, "The black line of this insulating tie rod is outside the arc extinguishing room, and it is obviously at the oil surface of the fuel tank...... Besides, if the oil surface catches fire, it can't be such a relatively regular black line, it should be burned black. ”

At this time, Zhang Yifu pointed to several other sections of insulating tie rods: "You can take a closer look, there are blistering phenomena all over it, indicating that the entire insulating tie rod was flashover at that time." ”

In fact, only half of the people present can really understand what is called flashover, and the other half who don't understand has taken the initiative to take half a step back and let those who understand.

After careful observation, a few experienced veteran comrades could only nod their heads.

"Yes, such dense blistering, it's time for a flashover. ”

"We were all staring at the arc extinguishing chamber and we were ignoring this. ”

"Flashover, flashover...... If it's flashing, it's only possible that it's damp?"

Zhang Yifu then nodded: "Yes, it is damp, and the entire insulating rod is damp." ”

Hearing this conclusion, everyone began to fall into a discussion.

"Will the insulating tie rod get damp alone?"

"It shouldn't be. ”

"Just now, the insulation test of the entire switch has been passed, and it should be damp if it is wet. ”

"And the insulating oil has also been tested, and the pressure resistance is no problem. ”

During the discussion, a young man from the safety supervision department of the ministry expressed a different opinion.

"Leaders, you haven't worked in the southern power plant, I was transferred from the power plant over there, this kind of internal dampness is indeed possible, but it is rare in the north. ”

"What do you say?" Nangang raised his eyebrows, and he touched something in a trance.

That is to say, the general dampness is not a sudden large amount of water ingress, but a process of water vapor accumulating over time, passing through the seals, through those gaps or the surface of the material, gradually penetrating, when the water vapor reaches a certain distance, it will condense inside, condense more, and then flow into the insulating oil, and guide the insulating oil into the water. ”

"But we've checked the insulating oil!" Ou Wei asked next, "It's no problem to resist pressure." ”

"That's right, the quality of the insulating oil we have used recently is relatively good, the insulation is strong, even if there is a slight water seepage, there will be no problem, if you have to check the water seepage, you can only use professional instruments to do. As the young man in the ministry spoke, he turned to Zhang Yifu and expressed his doubts, "Director Ou is right, it has been tested just now, even if the insulating oil is really wet, the dielectric strength is still within the standard, and it can extinguish the arc in the arc extinguishing chamber." ”

Zhang Yifu immediately said: "At this point, I, like everyone, also made the mistake of dogmatism and empiricism, thinking that the explosion would definitely be born in the arc extinguishing chamber that directly produces high temperatures, but in fact, we thought the opposite, the arc extinguishing chamber did not explode directly at all, and there was no contact, and it was the porcelain bottle that really went wrong first." ”

In the surprised expressions of everyone, Zhang Yifu had to elaborate further: "The comrade in the ministry just said that after the water vapor penetrates, it will produce condensation inside the switch, and eventually flow into the insulating oil, and over time, the water will be steamed again, of course, the water will not come out as soon as the water comes in, this steam cannot be steamed out of the switch, it will only circulate inside, and the insulating rod is the first contact place after the water is steamed." ”

Hearing this, someone who finally reacted quickly said, "Wait...... I see! What do you mean is that in this series of ways, the insulating tie rod is damp and has a flashover when closing?"

"Yes. Zhang Yifu continued, "The flashover conducts the high temperature in a short period of time, and further conducts the vaporization of the insulating oil, and the black line is the best evidence, and the vaporized insulating oil leads to the high temperature and high pressure inside the switch, and the explosion is imminent." ”

After that, Zhang Yifu finally pointed to the scene of the explosion: "So as you can see, the porcelain bottle has been blown up dozens of meters, but the rest of the switch has been relatively limited, especially the arc extinguishing chamber, which is basically intact." ”

was so little by Zhang Yifu, the clearer the truth became, everyone thought about it one after another, and pushed it back, unable to find anything to refute. (To be continued......)

Tips: The new domain name "biquge.info" has been launched by Biquge, and the original domain name is about to be discontinued. Please tell each other, thank you!