When would you use a line reactor on a VFD?
When would you use a line reactor on a VFD?
Line reactors should be used when:
- Line side is prone to surges, transients and harmonics.
- If VFD devices are being used in the circuit.
- Total Harmonic Current distortion (THID) drive exceeds 5%
- Turning on heavy-duty equipment or machines going through heavy loads.
What is a load reactor for VFD?
Load reactors (also called an output reactors) are installed after the VFD to protect the motor. They can increase load inductance and reduce the effect of reflected waves. If a load reactor is used at the output, it should be located as close to the VFD as possible.
What is reactor in AC?
A line reactor (also referred to as a “choke”) is a variable frequency drive (VFD) accessory that consists of a coil of wire that forms a magnetic field as current flows through it. When an AC reactor is placed between the power system and the drive, it is referred to as an AC line reactor.
Do you need a reactor with a VFD?
A line reactor is an optional component that can be added to a drive system to protect the VFD and other devices from power surges and transients.
What does a 3 phase line reactor do?
3% impedance line reactors should be used to reduce power line transient voltages caused by capacitor switching, line notching, DC Bus over-voltage tripping and inverter over-current and over-voltage conditions. They improve the true input power factor and reduce cross-talk between drives.
Are line and load reactors the same?
Load reactors are generally used with motors circuits (load side of a motor drive), while line reactors are used in power distribution (line side of a drive). The reason line/load inductors can limit current is based on a principle known as reactance.
How does a 3 phase line reactor work?
Quite simply, a 3-phase line reactor is an inductor wired in series between two points in a power system. Reactors are simple electro-magnetic devices, some- times referred to as inductors.
What is a 5% line reactor?
5% Line Reactor – 200-230, 380-480 VAC 5% Impedance Line Reactor for the use of reducing input line distortion in Variable Frequency Drives helping to prevent damage to the components of the drive. Reduces input line distortion. Eliminates transient and overvoltage nuisance tripping.
How do you choose a line reactor?
Selecting a Line Reactor for VFD applications
- Insulation class – look for 200⁰ C insulation or better.
- Expect a minimum of a 115⁰ C heat rise.
- Ask for VPI (vacuum pressure impregnation) construction.
- Reactors should be designed for both line and load side use, with no de-rating.
What is a 3 phase reactor?
Quite simply, a 3-phase line reactor is an inductor wired in series between two points in a power system. That percentage then becomes the common term used to define the level of impedance for each rating of line reactor. That impedance functions to slow the rate of current changes in the line.
What is a line reactor (choke)?
A line reactor (also referred to as a “choke”) is a variable frequency drive (VFD) accessory that consists of a coil of wire that forms a magnetic field as current flows through it. This magnetic field limits the rate of rise of the current, thus reducing harmonics and protecting the drive from power system surges and transients.
What are the different types of reactors used in variable frequency drives?
There are two primary types of reactors used in variable frequency drives: AC & DC. When an AC reactor is placed between the power system and the drive, it is referred to as an AC line reactor. When a DC reactor is inserted into the DC link of a variable frequency drive, it is known as a DC link reactor.
What is the difference between AC and DC link reactor?
When an AC reactor is placed between the power system and the drive, it is referred to as an AC line reactor. When a DC reactor is inserted into the DC link of a variable frequency drive, it is known as a DC link reactor. Both AC and DC reactors limit harmonic currents.
What is the difference between AC and DC VFDs?
Both AC and DC reactors limit harmonic currents. However, AC reactors have the significant advantage of protecting the entire VFD from power system surges and transients since they are placed between the power system and the incoming power terminals at the drive.
