REACTOR
ABOUT PRODUCTS
STARTING AUTO TRANSFORMER
◈ Purpose of use
This method uses an auto transformer to start the motor.
If the neutral point is opened without disconnecting
the autotransformer after starting, the
autotransformer will act as a reactor.
At this time, if the neutral point is short-circuited, the
rated voltage is applied to the motor and it starts.
The characteristic of this method is that when
switching from tap voltage to full voltage, Since the
power source and motor are not separated, there is
less shock. Therefore, because the starting torque of
the load is large, it is often used for starting large-capacity motors.
◈ Loads requiring automatic
transformer starting
1. When power capacity is low
2. When the starting torque of the load is large
3. When the flywheel is large
4. Equipment load with severe voltage fluctuations
when starting the motor
◈ Product specifications
※ The above dimensions may change slightly depending on detailed specifications, etc.
※ Please contact us separately for sizes not indicated as they are manufactured according to our standards.
MOTOR STARTING REACTOR
◈ Purpose of use
This method uses an auto transformer to start the motor.
If the neutral point is opened without disconnecting
the autotransformer after starting, the
autotransformer will act as a reactor.
At this time, if the neutral point is short-circuited, the
rated voltage is applied to the motor and it starts.
The characteristic of this method is that when
switching from tap voltage to full voltage, Since the
power source and motor are not separated, there is
less shock. Therefore, because the starting torque of
the load is large, it is often used for starting large-capacity motors.
◈ Operating principle
The reactor for starting the motor is a reduced-pressure starting method that reduces the terminal voltage when starting the induction motor. As the rotating machine in the stationary state is started and the current decreases, the terminal voltage rises and when complete start is achieved (after t seconds), the reactor By short-circuiting and operating at full voltage, the starting current is limited to ensure smooth starting of the motor and prevent accidents due to malfunction of the device or voltage drop during starting.
◈ Reactor capacity calculation
1. Calculated by motor capacity
If kW or HP is set, set the reactor's kW or HP equal to or slightly larger than the motor capacity.
2. Calculation based on actual load capacity
Once the actual load starting current value is calculated, the capacity of the reactor can be calculated based on the values of (Equation 1) and (Equation 2).
Caution) Please note that in (Equation 2), the (FAN or BLOWER) constant may range from 7 to 12 depending on the load type.
◈ Characteristic
1) The starting torque is large, making it easy to start, and the smooth start reduces mechanical shock.
2) When starting, the motor's starting current is reduced by the Tap setting (50%), harmonics are not generated, and the motor's heat generation is reduced to less than 65%, thereby protecting the motor's insulation.
3) The control method is simple and economical, and the starting current can be adjusted to suit the conditions by installing a tap.
4) This reactor is a molded type that is compact and lightweight, making it easy to handle and easy to repair and inspect due to the reduced area of the reactor.
◈ Built-in burnout-resistant contacts
Reactors for motor starting are rated for short-term use (10 seconds to 300 seconds). If the motor is started frequently, the reactor winding coil may be damaged if the reactor is operated for a long time due to reactor overheating and mechanical defects or malfunctions of the VC2 S/W. Therefore, an overheating prevention temperature sensor is built into the winding coil, and when the temperature of the reactor winding coil reaches 85℃, it operates as an A contact. At this time, the VC1 S/W blocking or protection circuit is activated to prevent such accidents.
■ Tap voltage
This refers to the voltage of each tap listed on the nameplate. The tap voltage of a three-phase reactor represents (100-a)% of 1/√3 before the circuit, and is equal to the tap voltage for each a value (Table 1). Generally, three of them are selected, but the middle one is selected. The tap is considered a rated tap.
◈ 3상 유도전동기의 기동방법 비교
◈ Product specification
※ The above dimensions may change slightly depending on detailed specifications, etc.
※ Please inquire separately for specifications not indicated as they are manufactured according to the standard.
CONDENSER SERIES REACTOR
◈ Purpose of use
If a condenser is used to improve the power factor in the power system, the distortion of the voltage or current waveform of the circuit may increase, causing malfunction of relays due to harmonic current in the condenser circuit. It is installed in series with the condenser to reduce distortion of circuit voltage and current waveforms, suppress inrush current when the condenser is turned on, and eliminate the negative effects of harmonics on the load.
◈ Sources of harmonics in the power system
▶ SMPS
▶ Loads from rectifiers and various conversion devices
▶ Fluorescent lamps, mercury lamps and TV fixtures
▶ Inverter
▶ Arc furnace and various electric furnace loads
▶ Welding machine
◈ Effects of Harmonics
1. When harmonics are included in the current : It causes copper wires, iron loss, overheating of equipment, and noise.
2. When harmonics are included in the current input: various disturbances occur, such as a decrease in the current resistance, that is, insulation breakdown, core loss, increase in noise, increase in current loss, and increase in charging current.
◈ Harmonic disturbances to equipment
1. Overload of condenser equipment
2. Loss (overheating) and capacity reduction of rotors and transformers
3. Overheating and damage to condensers and stabilizers for preventing noise from fluorescent frames
4. Malfunction of protection relay, error of indicator
◈ Reactance to harmonic sources
1. The harmonics present in the power system are 6% in the inductive circuit of the 5th harmonic.
2. 13 to 15% in circuits where the third harmonic of subway loads and arc furnace loads occur.
3. If there is a large-capacity rectifier or load welder, set 8 to 13% depending on the amount of generation.
◈ Performance of series reactor
※Specification basis : KSC-4806
1. Capacity tolerance: within -5% to +10%
2. Insulation resistance : 500MΩ or more
3. Maximum operating voltage : 110% or less of rated voltage
3. Maximum use current: The 5th harmonic content of the fundamental wave current is less than 35% and the composite current is less than 120%.
◈ Precautions when operating a series reactor
■ Condenser capacity change
Reduction in condenser capacity
If the capacity of the capacitor decreases, the reactance of the capacitor increases, and the % ratio of the series reactance to the capacitor decreases, so that the total impedance shifts to capacitive rather than the actual value, and harmonic expansion phenomenon may occur.
The capacity reduction of the condenser should be less than 10% of the total capacity.
Increase in condenser capacity
As the capacity of the denser increases, the current increases, which may cause overheating and burnout due to insufficient capacity of the series reactor. As the reactance value of the condenser decreases, the % rate of series reactance increases, so the series reactance and the terminal voltage of the condenser rise. In this case, replace the series reactor with an appropriate capacity.
◈ Precautions when setting up a series reactor
When using a series reactor connected to a condenser, the condenser terminal voltage rises above the circuit voltage.
◈ How to calculate capacity of series reactor
The capacity of the series reactor must be selected according to the harmonic components. In other words, it applies up to 6% for inductive general loads and 8~13% for converters, arc furnaces, etc., so please consult thoroughly with the manufacturer when ordering.
◈ Transient phenomenon when opening and closing a condenser
The conduction phenomenon and the role of the series reactor when opening and closing the condenser are explained as follows.
■ Condenser capacity change
As can be seen from the above equation, if XL is small, the inrush current can reach tens to hundreds of times. This phenomenon occurs in high-input circuits,
● When a series reactor is not installed
● When the power short-circuit capacity is large
● When there is no series reactor in the parallel BANK
● When there is residual charge in the condenser
This can easily occur, and overvoltage may occur in the secondary circuit of the CT, causing damage to connected devices such as machines and relays.
At this time, if 6% series reactor is installed,
※ If conversion between kVA and ㎌ is necessary, use the conversion formula or conversion table below.
DISCHARGE COIL
◈ Purpose of use
A discharge coil is installed to be used for the purpose of discharging residual charge in a short time when the capacitor is opened from the circuit by always being used in a low-pressure and high-pressure direct capacitor group.
◈ Place of installation
· Indoor (dry-type self-cooling)
· Outdoor Use (Inflow Self-Cooling Type)
◈ Performance
· Discharge capacity : 6 seconds after the start of discharge, the capacitor terminal voltage is 50V or less
· Insulation resistance : 400 ㏁ or higher
· Maximum voltage used : 24-hour average below 110% of rated voltage
· KBC 4804
◈ Product specification
INVERTER REACTOR
◈ Characteristics
AR : Reactor for power cooperation : LINE FILTER (ACL : For inverter shearing)
◈ Purpose of use
It is installed at the front end of the inverter to reduce harmonics generated by inverters or rectifiers using rectification circuits for three-phase six pulses and to improve power factor.
◈ Usage
3-phase inverter, rectifier, HVDC System, AC/DC Drivers, Elevators, etc
DR : 직류 리액터(DC REACTOR)
◈ 사용목적
인버터, 콘버터의 직류회로 사용되며 교류에서 직류로 정류하는 회로에서 직류 파형의 평활화를 목적으로 사용하는 리액터이다.
일반적인 리액터 보다 특수하게 제작되어야만 용도에 맞게 사용된다.
◈ 용도
정류된 DC파형에 교류분이 유입되거나, Notching, Ripple, Noise을 제거하기 위해 사용된다.
Inverter(WWF), Converter, AC/DC Drivers 등
◈ 특징
1. 특수 리액터로서 전기적 특성이 양호하고 절연내력이 우수하다.
2. 특수 방열구조로 냉각 특성이 탁월하고 단락 기계력이 우수하다.
3. 평활 리액터(Smoothing Reactor)에 Noise을 제거하기 위한 기능을 추가할 수 있다.
4. 인버터, 콘버터 등 DC 정류 회로의 부품소자를 보호하여 사용 수명을 연장한다. (기판보호)
NR : 소음저감용 REACTOR : LOAD FILTER(인버터 후단용)
◈ 사용목적
Notching으로 인한 각상 발생 토오크 불균일에 의한 회전력 편심으로 베어링 소음, 마모 및 진동 등으로 부터 전동기를 보호하기 위하여 인버터 후단에 설치한다.
◈ 용도
3상 인버터, 정류기, HVDC System, AC/DC Drivers, Elevators 등
REACTOR
ABOUT PRODUCTS
STARTING AUTO TRANSFORMER
◈ Purpose of use
This method uses an auto transformer to start the motor. If the neutral point is opened without disconnecting the autotransformer after
starting, the autotransformer will act as a reactor.
At this time, if the neutral point is short-circuited, the rated voltage is applied to the motor and it starts. The characteristic of this method is
that when switching from tap voltage to full voltage, Since the power source and motor are not separated, there is less shock.
Therefore, because the starting torque of the load is large, it is often used for starting large-capacity motors.
◈ Loads requiring automatic transformer starting
1. When power capacity is low
2. When the starting torque of the load is large
3. When the flywheel is large
4. Equipment load with severe voltage fluctuations when starting the motor
◈ Startup order
◈ Product specifications
※ The above dimensions may change slightly depending on detailed specifications, etc.
※ Please contact us separately for sizes not indicated as they are manufactured according to our standards.
MOTOR STARTING REACTOR
◈ Purpose of use
This method uses an auto transformer to start the motor. If the neutral point is opened without disconnecting the autotransformer after
starting, the autotransformer will act as a reactor.
At this time, if the neutral point is short-circuited, the rated voltage is applied to the motor and it starts. The characteristic of this method is
that when switching from tap voltage to full voltage, Since the power source and motor are not separated, there is less shock.
Therefore, because the starting torque of the load is large, it is often used for starting large-capacity motors.
◈ Operating principle
The reactor for starting the motor is a reduced-pressure starting method that reduces the terminal voltage when starting the induction
motor. As the rotating machine in the stationary state is started and the current decreases, the terminal voltage rises and when complete
start is achieved (after t seconds), the reactor By short-circuiting and operating at full voltage, the starting current is limited to ensure smooth
◈ Reactor capacity calculation
1. Calculated by motor capacity
If kW or HP is set, set the reactor's kW or HP equal to or slightly larger than the motor capacity.
2. Calculation based on actual load capacity
Once the actual load starting current value is calculated, the capacity of the reactor can be calculated based on the values of
(Equation 1) and (Equation 2).
Caution) Please note that in (Equation 2), the (FAN or BLOWER) constant may range from 7 to 12 depending on the load type.
◈ Characteristic
1) The starting torque is large, making it easy to start, and the smooth start reduces mechanical shock.
2) When starting, the motor's starting current is reduced by the Tap setting (50%), harmonics are not generated, and the motor's heat
generation is reduced to less than 65%, thereby protecting the motor's insulation.
3) The control method is simple and economical, and the starting current can be adjusted to suit the conditions by installing a tap.
4) This reactor is a molded type that is compact and lightweight, making it easy to handle and easy to repair and inspect due to the
reduced area of the reactor.
◈ Built-in burnout-resistant contacts
Reactors for motor starting are rated for short-term use (10 seconds to 300 seconds).
If the motor is started frequently, the reactor winding coil may be damaged if the reactor is operated for a long time due to reactor
overheating and mechanical defects or malfunctions of theVC2 S/W.
Therefore, an overheating prevention temperature sensor is built into the winding coil, and when the temperature of the reactor
winding coil reaches 85℃, it operates as an A contact.
At this time, the VC1 S/W blocking or protection circuit is activated to prevent such accidents.
■ Tap voltage
This refers to the voltage of each tap listed on the nameplate. The tap voltage of a three-phase reactor represents (100-a)% of 1/√3 before
the circuit, and is equal to the tap voltage for each a value (Table 1). Generally, three of them are selected, but the middle one is selected.
The tap is considered a rated tap.
◈ Product specification
※ The above dimensions may change slightly depending on detailed specifications, etc.
※ Please inquire separately for specifications not indicated as they are manufactured according to the standard.
CONDENSER SERIES REACTOR
◈ Purpose of use
If a condenser is used to improve the power factor in the power system, the distortion of the voltage or current waveform of the circuit may
increase, causing malfunction of relays due to harmonic current in the condenser circuit. It is installed in series with the condenser to reduce
distortion of circuit voltage and current waveforms, suppress inrush current when the condenser is turned on, and eliminate the negative
effects of harmonics on the load.
◈ Sources of harmonics in the power system
▶ SMPS
▶ Loads from rectifiers and various conversion devices
▶ Fluorescent lamps, mercury lamps and TV fixtures
▶ Inverter
▶ Arc furnace and various electric furnace loads
▶ Welding machine
◈ Effects of Harmonics
1. When harmonics are included in the current : It causes copper wires, iron loss, overheating of equipment, and noise.
2. When harmonics are included in the current input: various disturbances occur, such as a decrease in the current resistance, that is,
insulation breakdown, core loss, increase in noise, increase in current loss, and increase in charging current.
◈ Harmonic disturbances to equipment
1. Overload of condenser equipment
2. Loss (overheating) and capacity reduction of rotors and transformers
3. Overheating and damage to condensers and stabilizers for preventing noise from fluorescent frames
4. Malfunction of protection relay, error of indicator
◈ Reactance to harmonic sources
1. The harmonics present in the power system are 6% in the inductive circuit of the 5th harmonic.
2. 13 to 15% in circuits where the third harmonic of subway loads and arc furnace loads occur.
3. If there is a large-capacity rectifier or load welder, set 8 to 13% depending on the amount of generation.
◈ Performance of series reactor ※Specification basis : KSC-4806
1. Capacity tolerance: within -5% to +10%
2. Insulation resistance : 500MΩ or more
3. Maximum operating voltage : 110% or less of rated voltage
3. Maximum use current: The 5th harmonic content of the fundamental wave current is less than 35% and the composite current is
less than 120%.
◈ Precautions when operating a series reactor
■ Condenser capacity change
Reduction in condenser capacity
If the capacity of the capacitor decreases, the reactance of the capacitor increases, and the % ratio of the series reactance to the capacitor
decreases, so that the total impedance shifts to capacitive rather than the actual value, and harmonic expansion phenomenon may occur.
The capacity reduction of the condenser should be less than 10% of the total capacity.
Increase in condenser capacity
As the capacity of the denser increases, the current increases, which may cause overheating and burnout due to insufficient capacity
of the series reactor. As the reactance value of the condenser decreases, the % rate of series reactance increases, so the series reactance
and the terminal voltage of the condenser rise. In this case, replace the series reactor with an appropriate capacity.
◈ Precautions when setting up a series reactor
When using a series reactor connected to a condenser, the condenser terminal voltage rises above the circuit voltage.
◈ How to calculate capacity of series reactor
The capacity of the series reactor must be selected according to the harmonic components. In other words, it applies up to 6% for inductive
general loads and 8~13% for converters, arc furnaces, etc., so please consult thoroughly with the manufacturer when ordering.
◈ Transient phenomenon when opening and closing a condenser
The conduction phenomenon and the role of the series reactor when opening and closing the condenser are explained as follows.
■ Condenser capacity change
As can be seen from the above equation, if XL is small, the inrush current can reach tens to hundreds of times.
This phenomenon occurs in high-input circuits,
● When a series reactor is not installed
● When the power short-circuit capacity is large
● When there is no series reactor in the parallel BANK
● When there is residual charge in the condenser
This can easily occur, and overvoltage may occur in the secondary circuit of the CT, causing damage to connected devices such as
machines and relays.
At this time, if 6% series reactor is installed,
※ If conversion between kVA and ㎌ is necessary, use the conversion formula or conversion table below.
DISCHARGE COIL
◈ Purpose of use
A discharge coil is installed to be used for the purpose of discharging residual charge in a short time when the capacitor is opened
from the circuit by always being used in a low-pressure and high-pressure direct capacitor group.
◈ Place of installation
· Indoor (dry-type self-cooling)
· Outdoor Use (Inflow Self-Cooling Type)
◈ Performance
· Discharge capacity : 6 seconds after the start of discharge, the capacitor terminal voltage is 50V or less
· Insulation resistance : 400 ㏁ or higher
· Maximum voltage used : 24-hour average below 110% of rated voltage
· KBC 4804
◈ Product specification
INVERTER REACTOR
◈ Characteristics
AR : Reactor for power cooperation : LINE FILTER (ACL : For inverter shearing)
◈ Purpose of use
It is installed at the front end of the inverter to reduce harmonics generated by inverters or rectifiers using rectification circuits for
three-phase six pulses and to improve power factor.
◈ Purpose
3-phase inverter, rectifier, HVDC System, AC/DC Drivers, Elevators, etc
DR : Direct Current Reactor(DC REACTOR)
◈ Purpose of use
It is used in the direct current circuit of inverters and converters, and is a reactor used for the purpose of smoothing the direct current
waveform in a circuit that rectifies alternating current to direct current.
It must be manufactured more specifically than a typical reactor to be used for its intended purpose.
◈ Usage
It is used to remove alternating current particles from the rectified DC waveform or to remove notching, ripple, and noise.
Inverter(WWF), Converter, AC/DC Drivers, etc.
◈ Characteristic
1. As a special reactor, it has good electrical characteristics and excellent insulation strength.
2. The special heat dissipation structure provides excellent cooling characteristics and excellent short-circuit mechanical power.
3. A function to remove noise can be added to the smoothing reactor.
4. It protects components of DC rectifier circuits such as inverters and converters to extend their service life. (Substrate protection)
NR : For noise reduction REACTOR : LOAD FILTER(For inverter rear end)
◈ Purpose of use
It is installed at the rear of the inverter to protect the motor from bearing noise, wear, and vibration due to rotational force eccentricity
due to angle phase generation due to torque unevenness due to notching.
◈ Usage
3-phase inverters, rectifiers, HVDC System, AC/DC Drivers, Elevators, etc.
Login with Naver ID 
Login with Kakao ID 
Login with Google ID