Dry transformers are widely used in local lighting, high -rise buildings, airports, pier CNC mechanical equipment and other places. Simply speaking, dry transformers refer to transformers that are not impregnated with iron cores and windings in insulation oil.The cooling method is divided into natural air cooling (an) and forced air cooling (AF).
The advantages and disadvantages of dry transformers
Dry transformer: rely on air to cool down, generally used for local lighting and electronic lines.In the power system, transformers such as machinery and equipment, in the power system, general steam machine transformers, boiler transformers, ash removal transformers, dust removal transformers, desulfurization transformers, etc. are dry transformers, with a variable ratio of 6000V/400V and 10KV/400V for the rated voltage of 380VThe load.To put it simply, dry transformers refer to transformers that are not impregnated with iron core and winding in the insulation oil.Generally, there are two types of pressure regulation and pressure -free pressure regulation. With dry changes and dry changes with shells. Because there is no oil, there is no problem with fire, explosion, pollution, etc. ThereforeThe dry transformer is placed in a separate room.Losses and noise have dropped to new levels, and the transformer and low -voltage screens are placed in the same power distribution room to create conditions.
Installation of dry transformers
The transformer installation is qualified in accordance with the "Standards for the Transfer Test of Electrical Equipment Installation Engineering Electric Device Installation Engineering Electric Equipment".The installation location is correct and the attachments are complete.The grounding trunk lines caused by the grounding device are directly connected to the low -voltage side of the transformer; the shell of the transformer box and the dry transformer is reliable to ground; all connections are reliable, and fasteners and anti -loose parts are complete.
Dry load capacity of dry transformers
The first is that it can automatically reduce the backup capacity and quantity: in some specific places and scenes, in emergency situations, the spare coefficient of the transformer is quite high, so that the engineering optional transformer becomes a headache.For the overload capacity of the dry transformer, its spare capacity can be manually compressed, and the number of backup tables can also be reduced in large quantities compared with other types of transformers.Here we should note that if the transformer is in a state of overloading, we must have the operation process of monitoring its operating temperature. If the temperature is too high or even 155 ° C, we must carry out the corresponding loading operation to ensure safetyPower supply.
Dry transformer insulation level
According to the internal medium of the voltage, it can be divided into several models such as S8, S9, S10, SC (B) 9, SC (B) 10.SC (B) 10, SCZ (B) 9, SCZ (B) 10, can be divided into BS9, S9-, S10-, SH12-M according to closed or closure.The F and H -level in the transformer refer to the heat -resistant level. The limit of the Y level is 90 ° C, the limit of the A -level is 105 ° C, the limit of the E -Class is 120 ° C, the limit of the B -level is 130 ° C, the F -class is 130 ° C, the F -class is 130 ° C, the F -class is 130 ° C, the F -class is 130 ° C, the F -class is 130 ° C, the F -class is 130 ° C.The limit is 155 ° C, the limit of the H level is 180 ° C, and the limit of the C -level is greater than 180 ° C.
Dry transformer technical parameter
Use frequency 50/60Hz air load current 4%resistant pressure 2000V/min no -penetrating insulation level F -class (special level customable) insulation resistance ≥2m connection method Y/y, △/y0, yo/△, auto -coupled type, auto -coupled type, auto -coupled type(Optional) The coil allows the warm -up i00K heat dissipation method to naturally cool or temperature control automatic heat dissipation noise coefficient ≤30db
Dry transformer temperature
For the general dry transformer temperature on the market, different industries have different standards.Under normal circumstances, the dry transformer usually reaches 95 degrees during the normal operation, which is already a higher temperature standard for dry transformers.Generally, the temperature standard setting of low -pressure equipment usually does not exceed 60 degrees.
Dry transformer model
There are many types of dry transformer device, but no matter what type of dry transformer, it basically belongs to a three -phase transformer.wait.The number of phases, shape size and weight of various types.
Dry transformer price
The low -voltage dry transformer is composed of primary coils, secondary coils and iron heart (magnetic core). The voltage device is changed by electromagnetic induction.In electrical equipment and radio circuits, it is often used as a lifting voltage, matching impedance, and safe isolation.The functions of the transformer are: voltage transformation; current transformation, impedance transformation; isolation; voltage voltage (magnetic saturated transformer), etc.The price of the market price is 4000-20000.

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