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    10 hp (7.5 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-7d5
    5 kW (10hp) AC line reactor for connecting to the load side of the inverter, 20A rated current, 3 phase input, voltage 380 volt, input vfd line reactor with long life span and high efficiency, low cost and brand new.

    7.5 hp (5.5 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-5d5
    3 phase output line reactor voltage 480V, line reactor for VFD, 7.5 hp, rated current with 15 Amps, work frequency use in 50/60Hz. The material is divided into copper and aluminum, low cost, high quality and direct sales by manufacturers.

    10 hp (7.5 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-7d5
    The 10 hp (7.5 kW) AC vfd line reactor at a comfartable price, with rated current 20A, three phase output, work voltage 380V, line reactor coil adopts F and H class insulation system, which greatly improves the reliability of long-term operation.

    15 hp (11 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-011
    Cheap three phase AC line reactor for sale, 480 volt, power 15 hp, 30A rated current, vfd line reactor coil adopts F and H class insulation system, which greatly improves the reliability of long-term operation.

    15 hp (11 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-011
    Excellent 15 hp (11 kW) AC output line reactor for sale, designed with copper or aluminum material, line raector for connecting to the load side of the vfd, voltage with 220V, 380V, 400V, 410V, 440V, 460V or 480V, low cost, direct sale by manufacturer.

    20 hp (15 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-015
    15 kW VFD line reactor, 3 phase input, voltage 220V, 380V, 400V, 460V and 480V are optional, the rated current is 40 amps. AC line reactor adopts vacuum dipping process and is cured by high temperature heat curing, the coil has good insulation performance.

    20 hp (15 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-015
    The 20 hp 3 phase AC output line reactor is of good quality, it can be used for 220 to 480 voltage, materials can select copper or aluminum, working frequency is 50/60hz, 40 amperes current, perfect price and good safety.

    25 hp (20 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-020
    20 kW vfd input line reactor, three phase input, for connecting to the load side of the inverter, with 50A current, frequency 50Hz/60Hz, F, H insulation level greatly improves the reliability of long-term operation.

    25 hp (20 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-020
    25 hp output vfd line reactor, rated current 50 amps, 3 phase, has good insulation and good moisture-proof effect, work frequency 50/60Hz. Easy and quick installation, low prices direct from the manufacturer.

    30 hp (22 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-022
    3 Phase input line reactor for VFD, 30 hp (22kW), rated current is 60A, voltage 380V, 400V, 460V, and 480V are optional, freqency 50Hz or 60Hz, line reactor has the characteristics of strong anti-rust ability and good insulation effect.

    30 hp (22 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-022
    3 phase vfd line reactor, 30 hp, 22 kW power, three phase output, rated current of 60 amps, material copper or aluminum is optional. AC output reactor coil has good insulation performance.

    50 hp (37 kW) AC Line Reactor, 3 Phase Input

    SKU: ATO-ILR-037
    Affordable price AC line reactor for sale, 3 phase input, power 37kW, 90 Amp rated current, voltage can choose 220V, 240V, 400V, 415V and 480V, the frequency of 50Hz/60 Hz. High insulation and rust resistance make it ideal for loads used to connect VFD.

    50 hp (37 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-037
    50 hp AC output vfd line reactor at a low price, high quality, voltage 220V, 380V, 400V, 410V, 440V, 460V and 480V are optional, 90 amps, aluminum and copper materials can be selected, with 12 months warranty.

    75 hp (55 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-055
    The 150 amps AC line reactor operates at a frequency of 50/60 Hz, output3 phase. The material is divided into two types, copper and aluminum, power 75 hp (55 kW), strong anti-rust ability and good insulation effect.

    100 hp (75 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-075
    Low cost VFD output line reactor, 100 hp power, with rated current 200A, 3 phase, selectable voltages 220V, 380V, 400V, 410V, 440V, 460V or 480V, carrier frequency of 2-8 KHz, it's reliable and economical.

    150 hp (110 kW) AC Line Reactor, 3 Phase Output

    SKU: ATO-OLR-110
    150 hp vfd line reactor, 3 phase outout, with super high performance, rated current 250 amps, copper or aluminum for selection, attractive appearance, low noise, high protection class and durability. Low price and directly selling by manufacturer.

    100 hp (75 kW) DC Reactor, Single Phase

    SKU: ATO-DCR-100
    DC line reactor power 75 kW (100hp), rated current 200A, single phase, effectively improve the power factor and reduce the AC pulse of the DC bus, widely used for the DC side of the converter.

    125 hp (90 kW) DC Reactor, Single Phase

    SKU: ATO-DCR-125
    High quality DC line reactor for sale, 1 phase, power 125 hp, 90 kW, rated current 250A, dc voltage 220V to 1200V is optional, material copper or aluminum, improve the input current waveform change caused by capacitor filtering.

    150 hp (110kW) DC Reactor, Single Phase

    SKU: ATO-DCR-150
    Smoothing DC line reactor rated current 280A, single phase, able to reduce harmonic interference, used in in high voltage direct current, insulation class F, brand new, sold directly by the manufacturer.

    200 hp (160kW) DC Reactor, Single Phase

    SKU: ATO-DCR-200
    DC line reactor single phase, power 200 hp, rated current 400 amp, output dc voltage 200V, 380V, 400V, 440V to 1200V is optional, the DC line reactor can improve the power factor and reduce the AC pulse of the DC bus.

    What is a line reactor?

    The line reactor is the general name of the inductor and the reactance device. As inductor appeared earlier on the history of electrical equipment and was called line reactor, capacitor is also called reactance device. Common line reactors include the incoming line reactor, which is used to restrict the sudden voltage change and current impact caused by overvoltage. It can also smooth the spike pulse contained in the power supply voltage, thus improving power quality. Single phase DC line reactor is mainly used between the DC link and link in the inverter system, its main function is to limit the AC component superimposed on the DC current to a specified value.

    A conductor will produce magnetic field in a certain range of space it occupies when it's powered on, so all electric conductors carrying current are inductive on a general sense. However, a long straight conductor often generates a small inductance, the generated magnetic field is not strong, so the actual line reactor is a wire wound solenoid, which is also called air core line reactor. Sometimes an iron core would be inserted into the solenoid to generate greater inductance, which is called iron core line reactor. Reactance is divided into inductive reactance and capacitive reactance, in the more scientific division, both impedor (inductor) and reactance (capacitor) are called line reactor. However, as inductor appeared earlier and was called line reactor, the capacitor people often say only refers to the reactance, and line reactor refers specifically to the inductor.

    Line reactor function

    The functions of input line reactor

    It can restrain harmonic current, improve power coefficient, weaken surge voltage in input circuit, the impact of current on VFD, the influences of power voltage, limit current surge caused by grid voltage change and switching surge, spike pulse or voltage defects in phase change of rectifying circuit, effectively protect VFD and improve power coefficient. Input line reactor not only can stop the disturbance from power grid but reduce the pollution of power grid by harmonic current produced by rectifying unit.

    The functions of output line reactor

    When the length of cable between VFD and motor is longer than the specified value of product, output line reactor should be added to offset the influences of charging and discharging of coupling capacity in the operation of cable of motor and avoid overcurrent of VFD. Output line reactors are divided into two types. One is iron core line reactor adopted when the rate of carrier wave is lower than 3kHz. The other one is ferrite line reactor adopted when the rate of carrier wave is lower than 6kHz. The installation of output line reactor on the output terminal of VFD aims to increase the distance between VFD and motor. Output line reactor can effectively restrain the instantaneous high voltage when turning on or off IGBT of VFD and reduce the adverse influences of voltage on cables and motor.

    How to solve line reactor failure?

    • How to solve the surface discharging of line reactor?

      Dry air parallel line reactor doesn't have any form of surface discharge in dry state. When it is raining, the parts with low temperature rise have conductive water film and high surface leakage current. Near end backflow lead row with concentrated surface electric leakage and the spots on the surface of waist have dirty and wet charge and electric leakage traces. Hydrophobic coating can restrain leakage current and prevent any form of surface discharge effectively.

      The end adopts the improvement measures of pre-burried annular current sharing electrode structure to solve the concentrated current leakage on lower end surface. Electric arcs can be prevented even without hydrophobic coating or when hydrophobic coating fails. As the currently best structure improvement measure, rainhat and rain protection layer can restrain surface current leakage to some extent.

    • How to solve the local heating of line reactor?

      If line reactor has local heating, reduce the loads of line reactor and strengthen ventilation. If necessary, adopt provisional measures, such as strengthening the blowing of fan. Eliminate faults when the opportunity of outage comes.

    • How to solve the the fracture of porcelain support insulator of line reactor?

      If the concrete column is damaged or porcelain support insulator has cracks, coils buldge and are earthed, adopt standby line reactor, disconnect and repair breaker. After the fault is eliminated, put it into operation.

    • How to solve the the burnout of line reactor?

      Line-Reactor. If the concrete column of line reactor and porcelain support insulator crack or some coils of line reactor burn out, check whether relay protection functions. If relay protection doesn't function, disconnect the power supply of line reactor manually, stop faulted line reactor and start the standby line reactor.

    • How to solve the screw extraction of ascending flange base of high voltage bushing of line reactor?

      The vibration frequency of body is not in line with that of grading ring. Owing to the damping of transformer oil, grading ring has a low vibration frequency. And owing to single point welding and aluminum sheet welding, it has a poor mechanical strength. In the long-term operation, the vibration brought by the inconsistent vibration frequency of earth tag of line reactor (aluminum, welding) and grading ring causes metal fatigue and cracks. Solution: fix ascending flange base and body to reduce free-running vibration.

      Loop current heating caused by flux leakage, design defects of high voltage outgoing line and surface oxidation of bolt heat the local eddy in single bolt weakening its mechanical strength. Solution: replace the fixed screw of ascending flange base with stainless steel screw to reduce the influences of flux leakage.

    Difference between AC reactor and DC reactor

    The common line reactors in electrical power system include series reactors and paralleling reactors. Series reactors are mainly used to limit short-circuit current or ultraharmonics in filter by connecting with capacitor in series or in parallel. The line reactors in power grid of 220kV, 110kV, 35kV and 10kV are used to absorb the idle work of charging capacity of cable line. Operating voltage can be adjusted by adjusting the number of line reactors in parallel. Ultra-high voltage paralleling reactor can improve the operation conditions relating to reactive power of electrical power system including

    1. The capacitance effect on light load or no-load circuit lowers transient overvoltage of power frequency.
    2. Improve the voltage distribution on long power transmission line.
    3. Balance reactive power in light load circuit to prevent the unreasonable flow of reactive power and reduce the power loss on circuits.
    4. When large generator unit and system are in parallel, lower the steady-state voltage of power frequency on high voltage bus for the convenience in the synchronous parallel of generators.
    5. Prevent self-excitation resonance of generator with long line.
    6. When the neutral point of line reactor passes by grounding device, inter-phase or phase-ground capacitance of compensated line of easy-to-get small line reactor can be used to accelerate the automatic extinguishing of secondary arc current.
    7. The connection of line reactor is divided into series connection and parallel connection. Series reactor is generally used to limit current. And parallel reactor is generally used in reactive compensation.

    DC line reactor is used to limit AC component on DC to a specified value. Filter reactor, also called DC smoothing reactor, is used at DC side of converter. The current in line reactor is direct current with AC component. It is used to limit the AC component on direct current to one specified value. It is also used in the coupling at DC side of parallel converter, DC flat wave of intermediate resonance circuit of voltage type frequency changer and flat wave of rectifier supply, to reduce intermittent limit, to limit the loop current in loop current circuit and the current rate of increase when DC fast switch breaks fault current, and to eliminate ripple wave. It is also used to reduce ripple quantity of current and improve input power factor. For more information about DC and AC line reactors, please contact us.

    How to select a line reactor for vfd?

    Its calculation and design philosophies are the same as the general reactor. The inductance value of the reactor is appropriate if the voltage drop of the fundamental current flowing through the reactor is not higher than the rated voltage.

    Impedance drop: Impedance drop refers to the practical voltage drop on the two terminals of the reactor coil in XHz. Generally, choose impedance voltage drop in 1-4%.

    Selection of the inductance value: The rated inductance value of the reactor is an important parameter. If the inductance value is not selected appropriately, it will directly affect the voltage drop change under the rated current, so as to cause fault.

    However, the inductance value depends on the sectional area of the reactor iron core, coil winding number and air gap adjustment. The selection of the inductance value of the output reactor is mainly confirmed according to the cable length in the rated frequency scope. And then the sectional areas of the iron core and lead under the corresponding inductance value requirement shall be selected on the basis of the practical rated current of the motor, so as to determine the practical voltage drop.

    Inductance value and cable length of the corresponding rated current: cable length rated output current inductance value.

    The choice of rated AC current: Rated AC current is to design the long-term working current of the reactor from the perspective of heating. Meanwhile, the sufficient higher harmonic components should be taken into account. In other words, the current practically flowing through the output reactor is the output current of the frequency motor load.

    What causes Line reactor to generate noise?

    The noise of the line reactor is mainly caused by the magnetostriction and interslice vibration of the silicon steel sheet. Moreover, because of the alternating magnetic field attractive force between the iron core sheets, the noise of the reactor is 10dB or more higher than that of the transformer with the same capacity. However, the ordinary technology will promote the reactor noise to reach the standard requirement. The abnormal reactor noise in the operation site is mainly caused by the inconsistent height of the three phases of the iron core column, and even the difference is great.

    However, there is no such vibration reduction measures such as being padded with the felt, resulting in the gap between the iron core sheet and upper iron yoke of a certain phase. Or because the levelness and straightness and other tolerance aspects are not strictly guaranteed in piling the iron core sheet. Because it fails to reach the technology requirement, the iron core sheet is inclined, and there is a gap among the sheets in the inclined areas. All the above reasons will result in the high abnormal noise of the reactor.

    One of the other manufacturing reasons for the high noise of the reactor lies in the insufficient clamp force of the iron core. The low iron core fastening force will increase the operation noise of the reactor. As the experience indicates, when the pressure intensity of the iron core clamp force is 0.8~1.2MPa, the noise of the reactor is the lowest. In addition to this, the compression screw and clamp nut of the iron core sheet should be equipped with an additional lock net, preventing from the looseness of the nut caused by the vibration of the iron core sheet in operation, so as to result in the high noise degree.

    Power harmonic: The current of the reactor input terminal has rather serious surge phenomenon, or the current change is rather serious.

    Silicon steel sheet: The silicon steel sheet of the reactor should be overlaid smoothly and orderly. The noise is easily to be caused if if the silicon steel sheet is not piled tightly.

    Coil: The gap caused by the internal looseness of the coil will generate great noise greatly.

    Immersion: If the paint immersion is not thorough or the time is too short, there might be missed immersion or insufficient immersion thickness.
    Fastener: If the screws on the reactor have looseness, it is easily to generate noise.

    Power: The capacitor has too small capacity (low possibility). To sum up, if your line reactor has reliable quality(low power harmonic mutation, smooth silicon steel sheet arrangement, thorough immersion and appropriate thickness and so on), and the parameter of the output power is consistent with the load, there will be no problem of noise.

    If the silicon steel sheet has low processing accuracy, serious rags in the manufacturing process, or the silicon steel sheet has bump, or the silicon steel sheet is not rolled in parallel of the magnetic flow direction, or the insulation between the iron core sheets is broken, the iron core is earthed in several points, or the nut is not tightened, all these will increase the noise of the reactor in different degrees.

    The line reactor is different from the transformer. There is a kind of alternating attractive force existing between the iron steel sheets because of the air gap, so its noise is higher than the transformer with the same capacity. In design, the magnetic flux density of the reactor should not be too high, which is usually valued below 1T. In addition, the main magnetic flux density is better to be lower than 0.9T. If the magnetic flux density is valued too high in design, the noise will be increased for 2~3dB if the magnetic flux density rises by 0.1T.

    In addition, if the designed magnetic flux density is too high, the unit iron core loss in the iron core sheet increases, thus resulting in the too high temperature of the iron core. If the temperature exceeds F grade thermal resistance temperature and it is operated for a long period, F grade insulation of the air gap piece will be aged and damaged slowly, and the noise will be increased accordingly.