Posted On Monday 17th October 2016 1:26 PM
Three-phase transformer consists of three core columns, each core column around the same phase of the two coils, one high-voltage coil, the other is low-voltage coil. Lei Lang Shanghai transformer manufacturers now to break down the three-phase transformer works:
1, the domestic 500,330,220 and 110kV transmission system voltage phasors are in phase, so the following voltage ratio of three-phase three-phase or three-phase SMPS transformers , high voltage and medium voltage windings with stars Shaped connection. When the core structure of three-phase three-core, the low-voltage windings can also be used star connection or angle connection, it is determined by the low-voltage transmission system with the voltage phasor and high voltage transmission system voltage phasor phase or lag 30 ° electrical angle.
500/220 / LVkV - YN, yn0, yn0 or YN, yn0, d11
220/110 / LVkV - YN, yn0, yn0 or YN, yn0, d11
330/220 / LVkV - YN, yn0, yn0 or YN, yn0, d11
330/110 / LVkV - YN, yn0, yn0 or YN, yn0, d11
2, 60 and 35kV of the domestic transmission system voltage has two different phase angle.
Such as 220 / 60kV transformer using YNd11 connection, and 220/69 / 10kV transformer with YN, yn0, d11 connection, the two 60kV transmission system a difference of 30 ° electrical angle. When 220/110 / 35kV toroidal transformers adopts YN, yn0, d11 connection, 110/35 / 10kV transformer adopts YN, yn0, d11 connection, the above two 35kV transmission system voltage phasor is also worse 30 ° electrical angle. Therefore, the decision 60 and 35kV winding connection method to be careful, connection must meet the requirements of the transmission system voltage phasor. According to the relative relationship between the voltage phasor 60 and 35kV
Posted On Tuesday 11th October 2016 12:07 PM
DC resistance (DCR) refers to the inherent resistance of the metal conductors from common mode choke manufacturers in the inductor, and it can be modeled as an inductor in series with a resistor. DC resistance is an important parameter in the DC-DC converter is designed as a resistance thereby resulting in I2R losses reduce efficiency.
Tolerance is compared to the value specified in the data table, change the actual value of the inductance of the inductor. This may result in a RF filter frequency offset selection not want.
Recently, the filter can be easily updated on the search results page Octopart these parameters search results, so you can see in line with the best part of the search criteria, and keep in mind the above properties. Here is an example.
Also called inductor or common mode choke coil If the inductor is used to block or decoupling at higher frequencies, it is called "choke." There are kernel-based construction materials and different types of inductors. Let's look at some of the following factors:
First, the air-core inductor air-core
No air core inductor core, its biggest advantage is that they have a high Q factor and low loss. Because they do not have a core, a greater number of coils needed to obtain the same value of inductance which leads to increase in size. They are mainly used in high-frequency applications, for example, where low inductance values have enough resonant circuit.
Section, select: Wuerth Elektronik's 74491 series is 1.65nH to 120nH II. Core ferrite core Inductorferrite
Ferrite cores are formed by a ferromagnetic material having a high permeability. Compared to other types of inductors have a much higher inductance. They also have lower losses. They noise filter, a high-quality trans
Posted On Monday 10th October 2016 1:04 PM
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The company is equipped with advanced manufacturing equipment and testing apparatus as well as a R&D center comprised by various technicians, which can offer different customers different new products according to customers¡¯ needs, developing and researching more new projects. common mode choke coil always adheres to the high quality and technological innovation. In the process of production the rigorous quality inspection standards and inspection technique are used in order to realize the total quality management from the incoming inspection, process inspection, to the outgoing inspection, which guarantee the high qu