Overall, intuitively, the structure of this switch is a bit like a "v" gesture made by a person stretching out two fingers when taking a photo. There are circuit outgoing lines on both sides, and the contact points of the switch are hidden in the fuel tank at the bottom of the middle.

Of course, this is three-phase AC, so there are actually three "vs" and three switches are inserted side by side on the bottom support. This thing looks pretty neat and white paint brushed. The porcelain pieces are spotless after being baptized by rain, and they are proudly shining in the sun.

Wait, Zhang Yifu misread it. This is the intact No. 2 exit switch next to it.

Turning around, the structure of the No. 1 switch that had been blown up was no longer visible. The structure of the "v" was blown up, and the "v" was overturned, and the three "vs" had long been broken, and the white main steel structure was also blackened, and it was disfigured without being disabled.

Miao Delin is undoubtedly the one who is in the most distressing moment. He pointed to the middle part of the switch, which had completely become the scene of the car accident. The place where the missile remains was said: "At that time, our factory closed the No. 1 outgoing switch, and the b-phase switch suddenly exploded, which affected the two-phase switches of a and c, causing the A-phase switch to break, the main body of the C-phase switch to fall, and the No. 1 outgoing switch had serious faults and grounding, and the busbar was broken, and the whole factory tripped."

Everyone knows this, and the question is why it explodes.

After a brief silence and regret, Nangang asked, "Have you ever moved after the accident?"

"Absolutely, this line was stopped immediately and the scene was not moved before the investigation." Miao Delin said quickly. "Of course, it was raining all the time last night, and some things might be washed away by the rain."

"Yes." Nan Gang walked forward two steps. He squatted on the ground, looked left and right, looked at the black and yellow oil marks on the remaining metal structure next to him, and asked with a squinted eye, "Is there any problem with the insulation oil?"

"No problem, the oil level is normal, and the replacement cycle has not yet reached." Miao Delin nodded, "Director Nan. Every operation of our operation has been recorded. This closing is definitely in line with the regulations and also in line with the dispatching instructions of the power management bureau."

"Well, if the rules are not standardized, the rules are not in compliance, there will be any records. Director Miao. Are you trying to say that this is a problem with the equipment, right?" Nangang slowly stood up, looked at the scene of the car accident again, and then looked at the switches around, "How long have these switches been used?"

"Switched in a year ago, the Soviet Union... Oh no, Russian-made switches." Miao Delin replied in fear and terror.

"It's been a year, how many operations have been carried out, how many times have they been broken and reunited. Why is it this time that happened? So many power plants across the country use this switch, why is it only your factory accident?" Nan Gang said, walking to Miao Delin and patted his shoulder, "Director Miao, I am in charge of safety. Is it a problem with equipment or operation? I can't escape my eyes."

Miao Delin's body trembled slightly, and he looked at the cold Nangang. He looked at his boss Zhao Wenyuan here, and wanted to say something but stopped. Finally, he could only lower his head and sigh, and swallowed everything he wanted to say.

Nan Gang ignored him and said to the surroundings: "Come on, let's study together to see if you can find anything at the accident site."

Zhang Yifu followed everyone around and began to observe the accident scene at the close range. After the fuel tank of the middle switch exploded, the metal turned into blackened scrap iron, and the porcelain bottles became slags, which had long been beyond recognition. However, the two AC-phase switches next to them were still in a state of disconnection.

Whether it is safety, operation or production, you can imagine what the accident will look like when the accident occurs when you see this tragic situation.

"It seems that insulation breaks down."

"It's hard to imagine how violent the arc was at that time. Even though the insulation oil was still there, it could explode."

"Can it be a problem that occurred at the same time on both sides?"

"It's hard to say, let's check the operation records later."

“How long have these switches been used?”

"Look at the equipment labeled emc-sw7 series, there are many power plants in North China and Northeast China, so there is no problem."

"After all, it is Soviet equipment, and safety is guaranteed."

A bunch of people discussed it on the spot, but in fact they didn’t carry any testing equipment. Most of the remarks and conclusions at this time depended on experience.

No matter how skilled Zhang Yifu is, he has so much experience. In addition, the people who come to investigate are either big leaders or old backbones who have been working for more than ten years or decades, and are mostly experts in the industry. It is really not the turn for Zhang Yifu to say anything. He also knows that Zhao Wenyuan asked him to investigate, just to give him a chance to show his face, but he did not mean to let the Jibei Power Plant make a name for himself in the investigation.

The steady Zhang Yifu didn't have much trouble at this time. He gradually left the army and began to look at the relatively complete switch next to him. The destroyed switch was beyond recognition and it was difficult to find anything.

Almost at the same time, the other two were doing the same thing, and they looked at the No. 2 switch group.

The three of them discovered each other at the same time and met and smiled.

"Zhang Yifu." Yao Xinyu was more cheerful than he imagined. He gently raised his glasses and reached out generously, "I saw it last time, I didn't have time to talk in detail, so I'm sorry."

"Where are there." Zhang Yifu expressed his understanding of this. Last time he and Yao Xinyu were with their respective factory directors, so it was hard to say much. At this time, he was much more casual. He took the opportunity to introduce, "This is Xia Xue, from the Ministry's Dispatch Bureau, and I am an alumni."

"Hello, hello." Yao Xinyu then stepped forward and shook hands with Xia Xue, quite enthusiastic.

"Hello." Xia Xue reluctantly responded, ignoring Zhang Yifu, thinking that she was still getting angry with him.

After getting to know each other, the three of them naturally talked about their own opinions. These three were newcomers and were just communicating privately, so naturally they didn’t have to worry about that much.

"It doesn't feel like an operation problem." Yao Xinyu did not hide his point of view and directly expressed his opinion. "I have read the operation record and I have participated in the maintenance. I came as soon as possible after the accident. I really can't find any problems."

"You mean..." Zhang Yifu narrowed his eyes and looked at the running switch, "What's wrong with the equipment?"

"It's hard to say, but at least there is no major problem in operation." Yao Xinyu turned to look at the other lines, "Look, there are five outgoing lines here. At that time, only Line 1 was in the gate opening state, and four lines were all running. In this case, the closing of Line 1, even if there were negligence in operation, there were other four lines to cover it. It is logical that such a big deal shouldn't have caused such a big deal."

Zhang Yifu thought briefly and found that Yao Xinyu’s big concept is not wrong. This kind of closing with a very low risk factor should not have problems. However, if you analyze the specific problems in detail and look at all the small and absurd mistakes together, there are actually breakthrough points.

Xia Xue looked at the leaders next to her who pointed at the wreckage, and said, "Why are they all staring at there? Staring at the operation. Shouldn't we check the equipment first at this time?" (To be continued)
Chapter completed!