Reactor working principle - Solutions - Huaqiang Electronic Network

Photocoupler

The reactors in the 220kV, 110kV, 35kV, and 10kV power grids are used to absorb the capacitive capacitive reactive power of the cable lines. The operating voltage can be adjusted by adjusting the number of shunt reactors. The ultra-high voltage shunt reactor has various functions for improving the operating status of the reactive power of the power system, and mainly includes: (1) a capacitive effect on a lightly loaded or lightly loaded line to reduce the power frequency transient overvoltage. (2) Improve the voltage distribution on long-distance transmission lines. (3) The reactive power in the line at light load is balanced as much as possible to prevent unreasonable flow of reactive power and also reduce power loss on the line. (4) Reduce the power frequency steady-state voltage of the high-voltage busbar when the large unit is in parallel with the system, so that the generators can be juxtaposed at the same time. (5) Prevent self-excitation resonance phenomenon that may occur in the long line of the generator. (6) When the neutral point of the reactor is used to pass the small reactance grounding device, the small reactor can also be used to compensate the phase and phase capacitance of the line to accelerate the automatic extinguishing of the submerged current, which is convenient to adopt.
An appliance that relies on the inductance of the coil to block current changes. According to the use, it is divided into 7 types: 1 current limiting reactor. Connected in series with the power circuit to limit the value of the short circuit current. 2 shunt reactor. Generally connected between the end of the ultra-high voltage transmission line and the ground, it acts as a reactive power compensation. 3 communication reactors. Also known as the wave blocker. The series connection is used in the transmission line for the communication line to block the carrier signal and enter the receiving device. 4 arc suppression reactor. Also known as arc suppression coil. Connected between the neutral point of the three-phase transformer and the ground to supply an inductive current when one phase of the three-phase power grid is grounded to compensate for the capacitive current flowing through the grounding point, so that the arc is not easy to ignite, thereby eliminating Overvoltage due to multiple reignition of the arc. 5 filter reactor. It is used in the rectifier circuit to reduce the amplitude of the ripple on the bamboo current; it can also form a circuit that can resonate with a certain frequency to eliminate the voltage or current of a certain harmonic of the power circuit. 6 electric furnace reactor. Connected to the electric furnace transformer in series to limit its short-circuit current. 7 Start the reactor. Connected to the motor in series to limit its starting current.