Product description
3150KVA dry-type transformer is a new generation of energy-saving power transformer developed and produced by our factory on the basis of combining China’s national conditions with reference to similar foreign products, with a capacity of 0.5KVA to 1800KVA, and Siemens 4AP is universal. The products comply with VDE0550, IEC204-1, IEC439, GB5226 and other standards. The material of 3150KVA dry-type transformer is made of new high-quality cold-rolled silicon steel sheet and column iron core imported from Japan, with reasonable structure, good performance, high efficiency and low noise. The winding adopts the de-aligning winding process, and the industry’s advanced vacuum impregnation equipment is introduced for secondary vacuum dipping and drying, so that the insulation level of the transformer can reach a higher standard, and the product performance, stability and operating life are greatly improved. The technology and technology of 3150KVA dry-type transformer products have reached the advanced level at home and abroad.
Structural features of 3150KVA dry-type transformer:
1. The iron core is made of high-quality cold-rolled grain-oriented silicon steel sheet, and the iron core silicon steel sheet adopts a 45-degree full miter seam, so that the magnetic flux passes along the direction of the silicon steel sheet seam. 2. There are the following types of windings: (1) winding type (2) Epoxy resin and quartz sand filling pouring (3) Glass fiber reinforced epoxy resin casting (i.e., thin insulating structure) (4) Multi-strand glass wire impregnated epoxy resin winding type (Generally, 3 is used, because it can effectively prevent the cracking of the poured resin and improve the reliability of the equipment) 3. High-voltage winding generally adopts multi-layer cylindrical or multi-layer segmented structure 4. Low-voltage winding Generally, it adopts a layer or foil structure
3150KVA dry-type transformer form:
1. Open-ended. It is a commonly used form, its body is in direct contact with the atmosphere, suitable for a relatively dry and clean room, (when the ambient temperature is 20 degrees, the relative humidity should not exceed 85%), and there are generally two cooling methods: air self-cooling and air cooling. 2. Closed. The body is inside a closed enclosure and is not in direct contact with the atmosphere. (Due to the seal. Poor heat dissipation conditions. It is mainly used for mining, and it belongs to the explosion-proof type) 3. Pouring type. With epoxy resin or other resin pouring as the main insulation, it has a simple structure. Small size. Suitable for smaller capacity transformers.
Characteristics and structure of 3150KVA dry-type transformer
Compared with the oil-type transformer, the 3150KVA dry-type transformer has no oil, so there is no fire, pollution and other problems, so the electrical specifications and regulations do not require the 3150KVA dry-type transformer to be placed in a separate room. Especially in the new series, the loss and noise have been reduced to a new level, and the conditions have been created for the transformer and the low-voltage screen to be placed in the same distribution room.
1. Temperature control system of 3150KVA dry-type transformer
The safe operation and service life of the 3150KVA dry-type transformer largely depend on the safety and reliability of the transformer winding insulation. The insulation is damaged by the winding temperature exceeding the insulation withstand temperature, which is one of the main reasons for the transformer to fail to work normally, so it is very important to monitor the operating temperature of the transformer and its alarm control.
2. The protection mode of 3150KVA dry-type transformer
According to the characteristics of the use environment and protection requirements, the 3150KVA dry-type transformer can choose different shells. IP23 protective shell is usually selected, which can prevent solid foreign objects with a diameter greater than 12mm and small animals such as rats, snakes, cats, and finches from entering, causing malignant faults such as short circuit and power outage, and providing a safety barrier for the live part. If the transformer is to be installed outdoors, an IP23 protective enclosure can be used, which can prevent water from dripping at an angle of 60° to the vertical line in addition to the IP20 protection features mentioned above. However, the IP23 enclosure will reduce the cooling capacity of the transformer, and attention should be paid to the reduction of its operating capacity when selecting.
3. Cooling method of 3150KVA dry-type transformer
The cooling methods of 3150KVA dry-type transformer are divided into natural air cooling (AN) and forced air cooling (AF). When naturally air-cooled, the transformer can operate continuously for a long time at the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation, or emergency overload operation; Because the load loss and impedance voltage increase greatly during overload, it is in a non-economic operating state, so it should not be in long-term continuous overload operation.
