Product Details

Main features of American box change:

Strong overload capacity, allowing overload 2 times 2 hours, overload 1.6 times 7 hours without affecting the life of the box change.

The elbow plug connector is very convenient for the connection of high-voltage incoming cables, and can be used as a load switch in emergency situations, which can be plugged and unplugged under power.

Double fuse protection is adopted, and the plug-in fuse (BAY-o-net) is a dual sensitive fuse (temperature, current) to protect the short-circuit fault occurred on the secondary side of the box transformer. The backup current-limiting protection fuse (ELSP) protects the internal faults of the transformer and is used to protect the high-voltage side.

Transformers generally use high ignition point oil (FR3).

All components such as fuses for high-voltage load switch protection are placed in the same oil tank as the transformer core and windings.

Anti-corrosion and protection of the shell of American box substation:

American box substation, its box body adopts anti-corrosion design and special spray paint treatment, which can be applied to various harsh environments, such as stormy and highly polluted areas. The box body has gone through eight pretreatment processes before painting, and then seven painting and baking processes are completed, which shows its cautious attitude towards anti-corrosion. However, domestically produced American box substation shells have almost no special treatment. Basically, they use pickling and electrostatic spraying treatment. Some companies even do not even pickling treatment. What's more, only spray paint on the outer surface. It can be imagined how the anti-corrosion ability of its shell is. Even with electrostatic spraying, there are often dead corners when the bottom surface is processed, and it is difficult for electrostatic spraying to spray powder on these untreated parts, so it will inevitably leave hidden dangers of rust. As the box transformer has to work in the outdoor environment of wind, rain and sun for many years, if the surface treatment is not good, the rust will be very serious. This issue is very important, and it is also a topic that has been paid close attention to, valued and studied in China for decades. Therefore, many manufacturers have adopted some other technologies to solve this problem. Regarding protection, the transformer oil tank and heat sink of the American box substation are partially exposed to the outside, the purpose of which is to improve the heat dissipation conditions. However, since it is directly exposed to the sun, under the heat radiation of the sun, will it affect the temperature rise? It has not been introduced in detail. In addition, the exposed parts are easily damaged by collisions and knocks from external forces. If it is damaged, a large amount of transformer oil will be lost, and the consequences will be disastrous. Therefore, some domestic manufacturers wrap a layer of steel plate on the heat sink in order to increase the protection capacity.

High voltage load switch of American box substation:

The load switch of the American box substation is put into the transformer tank. The oil-immersed three-phase linkage switch can be divided into two positions (terminal type) and four positions (ring net type). Since this load switch is placed in the transformer tank, its closing position can only be in accordance with the instructions of the external operation panel To judge, and its operation must be carried out through a dedicated insulated operating rod, so its operation is more complicated. From this point of view, its operation is very inconvenient. In addition, since the breaking contacts (that is, the obvious breaking point) of the load switch cannot be seen, it gives people a sense of anxiety after breaking. In addition, once the load switch fails, it will be very difficult to replace and repair it. The load switch generally adopts a vacuum circuit breaker.

About the maintenance of American box substation

After the American box substation is installed and used, there is basically no need to maintain it. However, due to various reasons, the maintenance of the box substation is indispensable for the products produced in China.

Due to the technical problems of the surface treatment of the shell, the corrosion condition should be strengthened;

The oil filled in the tank of American tank transformers is generally FR3 insulating oil, which has an ignition point of 312°C, and has excellent electric heating characteristics, high insulation strength, good lubricity, strong arc extinguishing ability, non-toxic, and can be biodegraded. Therefore, the harm to the environment and health is reduced. FR3 insulating oil does not form sediments like traditional mineral oil, and most of the domestically produced American box transformers are filled with 25# ordinary mineral oil. In addition, under normal circumstances, the upper part of the oil tank of the American box change is filled with inert gas to prevent the water in the air from being exchanged into the oil. The domestically produced American box substation may not have an enterprise to carry out this work. Over time, the performance of the oil will be reduced, and its sealing performance cannot reach the requirement of 7 Psig, so the oil must be changed regularly.

The American tank has no oil temperature protection. There is only a thermometer to display the oil temperature. When the oil temperature is too high, the plug-in fuse is used for protection. There is also a pressure release valve to release too much pressure in the oil tank. Therefore, you should always check whether the fuse is operating normally under these two conditions, and whether there is oil leakage from the shell.

Since the fuel tank of the American box transformer is exposed to the outside, frequent inspections should be carried out to prevent oil leakage due to damage caused by external collisions.

Technical Parameter