Structural characteristics and test methods of large rectifier transformers. The large-scale rectifier transformer consists of a single-box three independent cores with one voltage regulation and two rectifiers. The voltage regulation includes coarse adjustment winding, stable winding, common winding and voltage regulating winding. The rectification includes high voltage basic winding, high voltage phase shift winding and low voltage winding, and the low voltage winding is composed of several sets of windings connected in parallel. The structural feature of the rectifier transformer is that the arrangement of the leads is horizontal and vertical. The transformer structure is extremely complicated due to the interrelationship between the lead and the lead, between the lead and the winding, between the winding and the winding, between the voltage regulation and the rectification, and between the rectification and the rectification. Therefore, when the large-scale rectifier transformer is subjected to the lightning impulse withstand test, the potential distribution is complicated, and the surge voltage gradient at the head end of the transformer winding is the largest.
The test method was carried out by applying a negative lightning surge voltage to the high voltage end of the transformer. Since the rectifier transformer is less likely to be struck by lightning on the low voltage side, only the high voltage end of the transformer is subjected to lightning impulse withstand voltage test, and the three phases A, B and C are respectively placed in the maximum tap, rated tap and Minimum tap. According to the structural characteristics of the transformer, in order to adjust the lightning impulse withstand test waveform of the transformer, T1 is reduced and T2 is increased. Generally, when the test is started, the T1 value is 5-8 μs or more, and the T2 value is 13-26 μs or less, and finally the test waveform required by the standard is satisfied. However, due to the large inlet capacitance of the large transformer and the small inductance, when the tail resistance is adjusted to a certain extent, the adjustment of the wave head and the tail resistance value has little effect on the waveform, and it has almost no effect, and only the test wiring is changed. Adjust the test waveform.
aluminum tube with beautiful graphic on surface will be used on toothpaste products and skin care products. We also have square tube with plugs and Empty Eyeliner Tubes. Then hot stamping and printing on the surface. And there are also many caps for client choosing. And we can do custom size products from client request. Such as drawing, graphic, and molds building.
Clear Plastic Tube,Aluminum Tube With Cap,Aluminum Tube Container,Aluminum Cosmetic Containers
DongGuan LongTen package Products Co. Ltd , http://www.longtenpack.com