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Technical data
REACTOR - Technical Data of Motor Starting Reactor
 
Motor Starting Reactor
Mortor Starting Reactor is a device to reduce terminal voltage of an induction motor. As a rotary device in stop status starts and accelerates, its current reduces and terminal voltage increases to full
start (after t seconds). At this time, the reactor is short circuited so as to operate the motor at full voltage. By limiting a starting current, this reactor is able to help a motor start smoothly and prevent a voltage
drop induced accident at the time of wrong operation or start of a device.
 
Product Features
 
  • With a rise in the motor speed, the terminal voltage of the motor increases and accelerates. Along with it, starting torque automatically goes up. Therefore, this product starts easily and has low
    mechanical shock.
  • This product features simple control and economy, and is able to increase or decrease a starting current with the installation of tap.
  • At the time of start, this product does not cause harmonic waves and protects motor insulation.
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    Operation Principle
     
  • If S1 is injected at the time of its start, reactor is connected with motor in series. After start completion (t seconds), S2 is injected so that the product runs in full-load current.
  • In operation state after start completion, reactor has no current flow.
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    REACTOR - Technical Data of Motor Starting Single-Winding Transformer
     
    Motor Starting Single-Winding Transformer
    With the use of the principle of single-winding transformer, motor starts. After start completion, neutral point is opened without separation of single-winding transformer. As a result, single-winding transformer
    works as reactor. At this time, if tap is short circuited, rated voltage is supplied to motor for start. In this method, when tap voltage is converted to full voltage, power is not separated from motor. Therefore,a shock is reduced and start torque of load gets large. For this reason, it is used much to start a large motor.
     
    Operation Principle
     
  • If start torque of load is large
  • If power capacity is small
  • Load equipment with large influence of voltage fluctuation
  • If fly wheel is large
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    Load that need single-winding transformer start
     
  • With regard to S/W process, in the condition where S1 is turned ON, if S2 is turned ON, start should be performed by tap voltage. After start completion, S1 should be turned OFF.
  • If Sl is not turned OFF after start completion, the product is damaged. Be careful.
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    REACTOR - Technical Data of Series Reactor for Condenser
     
    Series Reactor for Condenser
    This product is inserted in the condenser for phase advencer or condenser group (low voltage, high voltage, and special voltage) in series. The purpose of this series reactor is to reduce distortion of circuit voltage waveform and control inrush current at the time if condenser injection.
     
    Harmonic wave occurrence sources of power system
     
  • Load of rectifier and various converters
  • Rotary device
  • Loads of acr furnace and various electric furnaces
  • Transformer
  • Fluorescent lamp, Mercury lamp, and TV
  • Welding machine
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    Effects of harmonic wave
     
  • If a harmonic wave is included in a current, copper loss, iron loss, device overheating, and noise occur.
  • If a harmonic wave is included in voltage, various failures, such as lowering withstanding voltage or insulation destruction, iron loss, increased noise, increased current loss, and increased charge current, occur.
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    Harmonic obstacle to device
     
  • Overload of condenser
  • Loss (overheating) of rotary device and transformer and capacity reduction
  • Overheating loss of the condenser for protecting fluorescent lamp noise and safe device
  • Error of malfunction indicator of protective relay
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    Reactance for harmonic wave occurrence sources
     
  • The inductive circuit with the 5th harmonic wave existing in power system 6%
  • The circuit with the 3rd harmonic wave of electric rolling stock load and arc furnace load 13~15%
  • Large rectifier and load welding machine (depending on an occurrence amount) 8~13%
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    REACTOR - Technical Data of Reactor for Inverter
     
    Reactor for Inverter
    Specification
    Attachment Position Name Application Criteria
    (1) Video for reduction Reactor If Radio Noise becomes an issue, it is applied as reduction measures.
    (2) Current for power coordination Reactor

    (ACLA1L,H)
    		If the capacity ratio of power transformer is in the range shown in Fig. A, it is needed.
    If Thyristor is turned ON-OFF with the same power, see Fig. B.
    If Condenser for power factor control on the power side is turned ON-OFF, see Fig. B.
    If there is more than 3% unbalance of power voltage
    (3) Direct Current Reactor (DCLA)
    (DCLAL,H)
    		If the ripple of rectified DC waveform is removed or power factor is improved
    (4) Alternating Current Reactor (ACLA2L,H) for noise reduction

    (ACLA2L,H)
    		Starting with Inverter causes unique large noise and vibration. Therefore, connect AC Reactor in between
       Inverter and Motor to make motor sound quality smooth and lower torque ripple. (Noise 3-5dB reduction)