How does a line reactor work?
Line reactors are electro-magnetic devices which consist of a steel core wrapped with copper coils. The coils form a magnetic field which current flows through limiting the rate of rise of current, reducing harmonics and protecting additional electrical devices.
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.
What is the difference between a line reactor and a load reactor?
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.
Do VFDs need line reactors?
Line reactors come highly recommended by many engineers, and when compared to the price of your motor they are inexpensive and easy to install. Line reactors not only protect your VFD but also protect your motor from disturbances such as transient, voltage spikes and surges.
Can a line reactor be used as a load reactor?
Line reactors can protect the entire VFD from power system surges and transients. When a reactor is connected in series between the VFD and motors, it is referred to as a load reactor, which helps protect motors like an energy buffer.
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.
Do I need a line reactor?
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 an input line reactor?
An input or line reactor helps protect a variable frequency drive (VFD) from input power line disturbances that could. cause nuisance tripping or damage to the drive. An input (line) reactor also reduces the harmonics that the VFD. generates back onto the line.
When should you use a line reactor?
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%
When to add an input AC line reactor to a drive?
“In almost all drive applications, the addition of an input AC line reactor is a low cost solution for drive protection and harmonic mitigation,” TCI, Line and Load Reactor Basics. When to install a line reactor? The supply line power is very stiff; greater than 10 times the kVA rating of the connected VFD.
Can I install a line reactor on the supply side?
Installing line reactor along with isolation transformer on the supply side: This is unnecessary and costly. Either reactor or isolation transformer should be sized to provide the required impedance to the drive.
How do you calculate the impedance of a line reactor?
The formula for calculating the % impedance of a line reactor is as follows: V_LN= Line-Neutral voltage at the input to the drive. Even for a delta (ungrounded) system use the calculated line-neutral voltage.
What type of line reactor is used with a VFD?
There are generally two types of line reactors used with VFDs; AC & DC. When a reactor is installed between the power system and the VFD, it is known as an AC line reactor. When a DC reactor is inserted into the DC link of a drive, it is known as a DC link reactor.