Why should pebbles be placed under the transformer
Writer： Hengfeng you electric Time：2023-04-13 views：times
We can often see that a large number of pebbles are placed under some transformers, so what are these pebbles for? Just for beauty?
Oil immersed transformer takes oil as the main insulation means of transformer and relies on oil as cooling medium, such as oil immersed self cooling, oil immersed air cooling, oil immersed water cooling and forced oil circulation. The main components of the transformer include iron core, winding, oil tank, conservator, respirator, explosion-proof pipe (pressure relief valve), radiator, insulating sleeve, tap changer, gas relay, thermometer, oil purifier, etc.
At this time, a series of components such as pebbles came into being;
The lower part of the transformer is generally called oil unloading pit or oil unloading pit (perhaps a similar name), which is connected to the former end oil pit or incident end oil pool.
When an incident occurs, such as oil injection or blasting, the oil of the transformer will be discharged into the oil unloading pit and then flow to the oil pool at the front end.
In the pool, some are made of grating, and some are not made of grating. The pebbles are placed on the fence; If there is no barrier, the pebbles are placed in the oil unloading pit. Whether to do grid or not is related to transformer type, capacity and voltage level. There are regulations in this regard.
The lower part of the oil immersed transformer is generally called the oil unloading pool or oil unloading, which is connected to the front end oil pit or the front end oil pool. When an incident occurs, such as oil injection or blasting, the oil of the transformer will flow into the oil unloading pit through the pebbles, and then flow to the oil pool at the front end. At this time, the pebbles under the transformer play a blocking effect, reduce the fire and help save life; Other high-temperature transformer oil can reduce the fire after being cooled by pebbles.
In the pool, some are made of grating, and some are not made of grating. The pebbles are placed on the fence; If there is no barrier, the pebbles are placed in the oil unloading pit. Pebbles are placed to facilitate oil unloading. In addition, insulation is convenient for maintenance and operation is also a reason.
When placing pebbles under the oil immersed transformer, the following seven factors are mainly considered:
1. After the transformer has been used for a long time, the parts may have problems such as aging and leakage, and placing a large number of pebbles can absorb the transformer oil leakage, so that the transformer oil can flow back to the incident oil pool smoothly and reduce the occurrence of incidents;
2. Once an incident occurs, the pebbles can prevent oil splashing in the transformer and blasting.
3. In case of blasting fire, pebbles can play a barrier effect to prevent the fire from spreading to the ground, which is conducive to rescue.
4. Slight cooling effect. Pebbles can be used to cool the transformer when the temperature is too high.
5. Pebble insulation is convenient for maintenance and operation personnel to view the operation.
6. Pebbles have shock absorption effect. The effect is the same as the stone on the railway. It can add a layer of buffer.
7. Prevent weeds from growing.
Prevent the transformer from burning when the oil is discharged to the ground when it is on fire, and will not block the oil drain hole at the bottom of the oil drain pit. The oil flows down between the pebbles of the transformer to prevent oil contamination on the surface. When the oil is discharged, it also has the effect of cooling the oil temperature to prevent the oil from burning.
The above is why pebbles need to be placed under the transformer. If you want to know more about other problems of dry-type transformer, you can consult the transformer manufacturer's Engineer: + 86 15853252696 or email info@hengfengyou.com
