What should I do if the series reactor is improperly selected and burned?
series reactor(Capacitive reactor) is generally connected in series in the high-voltage power capacitor or capacitor bank circuit, and its main function is to restrain high-order harmonics, reduce the distortion of the network voltage waveform, and restrain the inrush current of the capacitor during phase-cut switching.
Improper choice of reactor and burnt.
The series reactor (capacitive reactor) used for the shunt capacitor is to reduce the inrush current multiple of the power capacitor bank during the switching process and restrain the higher harmonics of the power grid. Assuming that the reactor parameters are improperly selected, the harmonics will be enlarged and the reactor will increase. The current and voltage increased, Yixing Xingyi Special Transformer Co., Ltd. overheated the copper wire, the insulation layer on the winding was aged and broken down, and a short circuit occurred and burned.
In order to make the reactor give full play to the benefits in the power grid, the user is required to select the percentage value of the reactor appropriately. That is, the inductive reactance and capacitive reactance of the harmonic component should be made close to equal, and the relational formula xL>xc\/n2 should be satisfied: if the 5th harmonic is dominant in the system, then xL>xc\/52=0.04xc; If the 3rd harmonic is dominant in the system, then xL>xc\/32=0.11xc.
In practical use, if the 5th and above harmonics are to be used, a series reactor (capacitive reactor) with a reactance value of (5%-6%) xc is often used; and in order to restrain the 3rd and above harmonics, A series reactor (capacitive reactor) with a reactance value of (12%-13%) xc is often used. It should be noted that xc and xL cannot be exactly equal to prevent electromagnetic resonance and lead to overvoltage.
Generally speaking, the inductive reactance of the reactor should be slightly larger than the capacitive reactance. This avoids the resonance point and restrains the harmonics. Therefore, this requires the user to know the type of high-order harmonic components contained in the address network. And the quantity has a more detailed understanding. It is necessary to pass the test to obtain the parameters of the harmonic components.
