The reactor used in the power grid is essentially an air-core coil with no magnetically conductive material. It can be arranged in three vertical, horizontal and vertical forms as needed. When a short circuit occurs in the power system, a large value of short-circuit current is generated. If not limited, it is very difficult to maintain the dynamic stability and thermal stability of electrical equipment. Therefore, in order to meet the requirements of the breaking capacity of some circuit breakers, a series reactor is often placed at the outlet circuit breaker to increase the short-circuit impedance and limit the short-circuit current.
Due to the use of a reactor, the voltage drop on the reactor is large in the event of a short circuit, so it also plays a role in maintaining the bus voltage level, so that the voltage fluctuation on the busbar is small, and the user electrical equipment on the non-faulty line is ensured. Stability of operation.
The reactor reactor relies on the electrical resistance of the coil that resists current changes. Divided into 7 types according to usage:
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 reactor. 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.
Reactors are also called inductors. When a conductor is energized, it generates a magnetic field in a certain space occupied by it. Therefore, all current-carrying electrical conductors have a general sense. (http://) However, the inductance of the long straight conductor is small, and the generated magnetic field is not strong. Therefore, the actual reactor is a wire wound into a solenoid form, called a hollow reactor; Sometimes in order to make this solenoid have a larger inductance, a core is inserted into the solenoid, called an iron core reactor. The reactance is divided into inductive reactance and capacitive reactance. The more scientific classification is that the inductor (inductor) and the capacitive reactor (capacitor) are collectively referred to as a reactor. However, since the inductor is used in the past and is called a reactor, The capacitors that people nowadays are capacitive reactors, and the reactors are specifically referred to as inductors.

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