By hvhipot 
HV Hipot Electric Co., Ltd. specializes in producing series resonance (also known as series resonance withstand voltage test device). Next, we will share a comprehensive introduction to series resonance reactors with you.
Series resonant reactors, also known as inductors, generate a magnetic field within a certain spatial range when a conductor is energized, so all conductors capable of carrying current have a general sense of inductance. However, the inductance of an electrified long straight conductor is relatively small, and the magnetic field generated is not strong. Therefore, the actual reactor is a hollow core reactor in which the wire is wound into a solenoid form; Sometimes, in order to increase the inductance of this solenoid, an iron core is inserted into the solenoid, known as an iron core reactor. Reactance is divided into inductive reactance and capacitive reactance. A more scientific classification is that inductive reactance (inductor) and capacitive reactance (capacitor) are collectively referred to as reactors. However, due to the existence of inductors in the past and their designation as reactors, capacitors are now referred to as capacitive reactance, while reactors specifically refer to inductors.
Classification of reactors
An electrical appliance that relies on the inductance of a coil to prevent changes in current. Divided into 7 types by purpose: 1. Current limiting reactors. Connected in series in a power circuit to limit the value of short-circuit current. 2. Parallel reactor. It is generally connected between the end of the ultra-high voltage transmission line and the ground to provide reactive power compensation. 3. Communication reactor. Also known as a wave blocker. Connected in series in a transmission line that also serves as a communication line, used to block carrier signals from entering the receiving equipment. 4. Arc suppression reactor, also known as arc suppression coil. Connected between the neutral point of the three-phase transformer and the ground, it is used to supply 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 easily ignited, thereby eliminating overvoltage caused by multiple reignitions of the arc. 5. Filter reactor. Used to reduce the amplitude of ripple on the bamboo current in rectifier circuits; It can also form a circuit with capacitors that can resonate with a certain frequency to eliminate the voltage or current of a certain harmonic in the power circuit. 6. Electric furnace reactor. Connect in series with the electric furnace transformer to limit its short-circuit current. 7. Start the reactor. Connect in series with the electric motor to limit its starting current.
Application of Reactor
1. Speaking of reactors, they are essentially hollow coils made of non-magnetic materials. It can be arranged in three assembly forms: vertical, horizontal, and cross shaped, as needed. When a short circuit occurs in the power system, a significant short-circuit current is generated. It is very difficult to maintain the dynamic and thermal stability of electrical equipment without restrictions. Therefore, in order to meet the requirements of the breaking capacity of certain circuit breakers, reactors are often connected in series at the outgoing circuit breaker to increase the short-circuit impedance and limit the short-circuit current.
2. The specific uses of reactors can be divided into: current limiting reactors, filtering reactors, smoothing reactors, power factor compensation reactors, series reactors, balancing reactors, grounding reactors, arc suppression coils, incoming reactors, outgoing reactors, saturation reactors, self saturation reactors, variable reactors (adjustable reactors, controllable reactors), yoke current reactors, series resonant reactors, parallel resonant reactors, etc.
As a means of reactive power compensation, reactors are indispensable in power systems.
Current limiting reactor: Current limiting reactors are generally used in distribution lines. Limited current reactors are often connected in series on branch feeders from the same busbar to limit the short-circuit current of the feeder and maintain the bus voltage, so as not to be too low due to feeder short circuits. In HV Hipot Electric Co., Ltd. coal mine, reactors are connected in series on the output lines that supply power underground.
In addition, the rectification output circuit of HV Hipot Electric Co., Ltd. coal mine’s lifting system’s DC motor also has a series of reactors, which are smoothing reactors. Because the pulse number of the rectification circuit is always limited, there is always ripple in the output rectified voltage, which is often harmful and needs to be suppressed by smoothing reactors to make the output DC close to the ideal DC. This is essential in thyristor rectification electrical transmission, and sometimes two reactors need to be connected in parallel before being connected in series to the DC circuit. Furthermore, the asynchronous motor for the exhaust of HV Hipot Electric Co., Ltd. central air shaft has a relatively high power of 6kV/1250kW and a large starting current, which affects the network voltage. When the motor starts, the rotor current frequency fz is the highest, and Rf and Xd are the highest. The motor can obtain a large starting torque. After starting, as the speed increases, the rotor current frequency gradually decreases, and Rf and Xf automatically decrease, approximately obtaining a constant torque characteristic, achieving stepless starting of the motor. After starting, the short circuit is cut off.