What are the reasons for the noise of indoor dry transformer SCB10-1600KVA? Dry-type transformer as indoor use of power supply equipment, the size of its noise directly affects people's life and production, serious words is also a precursor of transformer failure. How to distinguish these noises and problems? Below is a brief introduction:
(1) the grid voltage is on the high side, and then the dry type transformer is magnetically dense, which leads to the increase of the noise of the product. At this time, the noise of the product can be reduced by properly regulating the tap voltage of the dry transformer.
(2) when the dry transformer is equipped with thyristor rectifier equipment, the current and voltage of the low-voltage side circuit contain many high harmonics. If the dry transformer chooses YYNO connection method, because the high voltage side chooses Y-type connection method and has no center line, the third harmonic current can not be transferred, and then the main magnetic flux distortion occurs in the core. In addition to the fundamental magnetic flux, there are many higher harmonics, especially the third harmonic component is the largest, so the noise increases significantly. Therefore, the use of DYNLL connection method between the dry transformer and SCR equipment to block the dry transformer talent to reduce the noise of the product.
(3) when the three-phase load of the dry-type transformer is severely unbalanced, the large zero-sequence current appears on the low-voltage side. Large zero sequence flux occurs in the core. The zero sequence flux is the positive rotation wave of the fundamental frequency, and its existence changes the size and phase of the flux, which makes the core single or two terms of magnetic density severely increase or full, and then makes the noise of the dry transformer significantly increase. Dry-type transformer with DYNLL connection method can reduce noise.
(4) when the core of the dry transformer is multi-point grounded or the core part of the chip is short-circuit, the magnetic flux of the core part will be distorted, causing the noise of the dry transformer to increase significantly. For this kind of situation, as long as the core fault is cleaned, the noise of the dry transformer can be reduced.
(5) the dry type transformer equipment site on the dry type transformer noise measurement and feel a greater impact. When the four walls of the dry transformer equipment site are smooth, and the distance between the dry transformer and the four walls is less than 3M, the noise of the dry transformer is prone to echo, so the noise measurement value and feeling are significantly higher than the noise announced by the dry transformer body. In this case, it is best for the user to lay sound-absorbing materials on the walls to reduce the echo of the noise, and then reach the intention of noise reduction.
Dry transformer dynamic change general careful analysis of the reasons, end the power of the dry transformer constantly moving, dry transformer dynamic is too large is a common problem, according to the above reasons can be analyzed to deal with. Welcome to consult our manufacturers or pay attention to our website for more questions about dry-type transformer!
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