How much do you know about dry-type transformers?
Transformer is one of the most indispensable link of power transportation, distribution transformer for industrial and mining enterprises and civil building one of the important equipment in the power supply and distribution system, today we will focus on the relevant knowledge about dry-type transformer, believe that if you read this article carefully, will have to dry-type transformer and a deeper understanding of the system.
Form of a dry-type transformer
⒈open type: is a commonly used form, its body and direct contact with the atmosphere, adapted to the relatively dry and clean indoor, (when the ambient temperature of 20 degrees, the relative humidity should not exceed 85%), generally have air self-cooling and air cooling two cooling methods.
⒉closed type: the device is in the closed shell, and does not directly contact with the atmosphere (due to poor sealing, heat dissipation conditions, mainly used for mining, belongs to the explosion-proof type).
⒊pouring type: with epoxy resin or other resin pouring as the main insulation, it is simple structure, small size, suitable for a small capacity of the transformer.
Working environment of the dry-type transformer
1.0-40 (℃), relative humidity <70%;
2. Altitude: no more than 2,500 meters;
3. Avoid rain, moisture, high temperature, high heat or direct sunshine. The distance between the cooling and ventilation hole and the surrounding objects should not be less than 40cm;
4. Prevent work in corrosive liquids, or gas, dust, conductive fibers or metal chips more places;
5. Prevent people from working in places of vibration or electromagnetic interference;
6. Avoid long-term inverted storage and transportation, without strong impact.
Wiring mode of dry-type transformer
1.The "input" and "output" terminals of the short connection transformer test the insulation resistance from the ground wire with a meu meter. At 1000V me-ohms, the resistance is greater than 2M ohms.
2.Section wiring of transformer input and output power lines shall meet the requirements of current value; configured according to 2-2.5A/min2 current density.
3.The input and output three-phase power line shall be connected to phase A, phase B and phase C respectively according to the color of the transformer wiring board bus. The zero line shall be connected to the neutral zero line of the transformer compressor, grounding wire, transformer shell and transformer center points. Usually we say that the ground lines and zero lines are drawn from the neutral point of the transformer.(If the transformer chassis shall be connected to the ground wire mark of the box). Check the input and output lines to be correct.
4.No-load power-up first, observe and test the input and output voltage to meet the requirements. At the same time, observe whether there are abnormal sound, fire, odor and other abnormal phenomena inside the machine. If there is any abnormal phenomenon, please immediately disconnect the input power supply.
5. The load can be connected only after the no-load test is completed and normal.
With the popularization and application of dry-type transformer, its production and manufacturing technology has also achieved considerable development. It can be predicted that the future dry-type transformer will be further developed in energy saving and noise reduction, high reliability, environmental protection characteristics, large capacity and multi-functional combination.At present, the domestic production of dry-type transformer technology has been very mature and advanced, the price of dry-type transformer is generally between $18,670 and $28.722. The price range fluctuates with the impact of product raw materials, production technology, and market supply and demand requirements.
So for dry-type transformer process production level and production strength, domestic has many very good suppliers, such as SHZ Power is a professional Chinese dry-type transformer manufacturers, if you want to know more about dry-type transformer, want to find high quality dry-type transformer, welcome to send E-mail query at any time.
