What is a line load reactor?

What is a line load reactor?

Line/load reactors are inductors; coils of wire that oppose the flow of alternating current and limit the current that can flow through the circuits into which they are placed. They are used in two principal applications. That opposition to current flow through the coil is known as inductive reactance.

What are line reactors used for?

Line reactors are electromagnetic devices used as inductors to protect variable frequency drives (VFDs) and other devices from electrical disturbances such as voltage spikes, surges, and transients. Line reactors can limit your current flow and harmful harmonics from the drive.

What is a 3% line reactor?

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. The greater the current through the reactor, the greater the percentage of applied impedance will be.

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.

Do line reactors generate heat?

The two primary causes of internal heat generated in a reactor are current and frequency. This means that if a 5% line reactor is properly sized for a drive, where the reactor current rating matches the actual current flow, we can expect input harmonic current distortion for that drive of about 35% THD-i.

How does a load reactor work?

Load reactors can protect the motor from damage by preventing these spikes. They also dampen the dv/dt (rate of change of voltage) that is applied to the motor windings, which improves performance of the motor and of the system. A reactor on the output side of a VFD is referred to as a load reactor.

Why line choke is used?

To protect thyristor form high transient current, because an inductance does not allow sudden change in current. All the semiconductors are having some tolerance to stand high transient current but beyond the limit which leads to semiconductor failure.

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

1. Insulation class – look for 200⁰ C insulation or better.
2. Expect a minimum of a 115⁰ C heat rise.
3. Ask for VPI (vacuum pressure impregnation) construction.
4. Reactors should be designed for both line and load side use, with no de-rating.

What does a 3 phase reactor do?

Three-phase reactors intended for the attenuation of notches and spikes, reduction of harmonics and limitation of inrush currents in converters and variable speed drives. Drop voltage of 4% of the rated voltage (400V).

Do I need a load reactor?

For any motor, if the distance is between 300 to 500 ft., a load reactor should be used. If the distance is over 500 ft. then a special type of filter called a dV/dt filter (low-pass filter) should be used. to ramp up higher, limited by the load or motor inductance.