Why are pebbles placed under the transformer?
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This area is usually referred to as an oil discharge pit or oil dumping pit (or similar names), and it leads to the accident oil pit or spill site. "In the event of an accident, such as oil spraying or an explosion, the oil from the transformer will be discharged into the oil drainage pit and then flow into the accident oil tank. It prevents the oil from continuing to burn even when it leaks onto the ground in the event of a transformer fire, and it also avoids blocking the oil (water) drainage holes at the bottom of the oil drainage pit. Some ponds have partitions, while others do not. For making grilles, the cobblestones are placed on top of the grille ； Without partitions, the cobblestones are placed in the oil discharge pit. |A free exchange platform for technologies in the thermal power industry, including power plant boilers, steam turbines, electrical systems, thermal control, water treatment, and more! Whether to use a partition for 3C-?m,r'|'g depends on the transformer type, capacity, and voltage level; there are regulations regarding this. k `$w B+S9A6c.`a Placing cobblestones is one reason to facilitate oil unloading; in addition, insulation, ease of maintenance, and the ability for operators to conduct inspections are also reasons. www.rdlm.com.cn v’m5BDO }X Additionally, there are also regulations regarding the size of the cobblestones. Clause 5.4.5 of the national standard 50060-92 stipulates that a gravel layer with a thickness of not less than 250 mm should be laid in the oil storage tank, with the gravel having a diameter of 50–81 mm. This layer also serves to reduce vibration and prevent the growth of tall weeds
Thank you, OP; I’ve learned a little more
Is there? I didn’t notice the pebbles; I’ll be more careful next time
I encountered this situation during a business trip for debugging, in the voltage regulator room. At that time, I only thought of its use for flame retardancy; I didn’t realize it had other functions as well, and even the size of the cobblestones was strictly regulated. I’ve learned a lot.
I used to work in electrical technology for a while; I really hadn’t noticed this issue! However, dry-type transformers are being used more and more these days!
I already knew it served to provide insulation, facilitate maintenance, and allow operators to conduct inspections; I now also understand that it helps with oil discharge as well, which has expanded my knowledge. Thank you!
I mean, why is there stone all under the transformer room? So it serves such an important purpose after all. I’ve learned something new.
Could the original poster also share the GB values for the cobblestones? That would be helpful for everyone to learn from~~
There is such a guideline on the forum: http://bbs.hcbbs.com/viewthread.php?tid=222496&highlight=50060%2B92
Cobblestones; I really hadn’t noticed that! Be sure to take a look next time
I knew about insulation before, but I really hadn’t noticed this! I’ve learned a lot. :o :o :o
There’s also an oil drainage pit under the cobblestones… Thanks to the original poster, I’ve learned something
Cobblestones serve to filter and organize the combustion
Such a small thing contains so much meaning; I’ve learned something!
These days, to save trouble, people just harden the ground and that’s it. . . I’ve been involved in several projects, and none of them were constructed according to the design
Cobblestones? I’m not sure if broken rocks of the right size will work ?
Crushed stones definitely won’t work. . One reason for pebbles seems to be their smooth surface, which prevents oil from accumulating, and they also have sufficient gaps for penetration
According to the standards, cobblestones should be used, but nowadays most use stones of varying sizes. That’s not entirely unacceptable either. It can also leak oil, the ground remains dry, and the thickness can be determined based on experience; generally, a thicker layer is not a problem.
It is specified in the GB 50060-1992 Design Code for High-Voltage Switchgear of 3–110 kV.