VTdrive What is VFD Line Reactor

Product catalog summary

Introduction to Line Reactors
A 3-phase Line Reactor consists of three coils, also known as windings, chokes, or inductors, assembled together. It is a series device connected in the supply line, ensuring all line current flows through it. Line Reactors are current-limiting devices that oppose rapid changes in current due to their impedance, helping to control current spikes and limit peak currents.

Impedance and Frequency Relationship
The impedance of a Line Reactor (XL) is calculated using the formula XL = 2πfL, where 'f' is the frequency and 'L' is the inductance. The impedance is directly proportional to both frequency and inductance. For example, if the impedance is 10 ohms at 60 Hz, it becomes 50 ohms at the 5th harmonic (300 Hz). Increasing the inductance also increases the impedance proportionally, reducing the current in the line.

Line Reactor Ratings
Line Reactors are rated based on % impedance, voltage, and current. They are sized according to % impedance, voltage, and motor horsepower, which determines the necessary current rating. The load impedance (Z) is calculated as Z = V/I, where V is the line voltage and I is the line current. A 5% Line Reactor would result in a 5% voltage drop.

Voltage and Current Ratings
The voltage rating is crucial for dielectric concerns and is used to determine the current rating when only voltage and horsepower are provided. The current rating, measured in amperes, is the total current flowing to the load(s) and through the reactor.

Contact Information
Shenzhen VTdrive Technology Co., Ltd. provides contact details including telephone, fax, website, and email for further inquiries. Their headquarters and factory addresses in Shenzhen, China, are also provided.

Catalog excerpts

WHAT IS A LINE REACTOR? A 3-phase Line Reactor is a set of three (3) coils (also known as windings, chokes or inductors) in one assembly. It is a series device, which means it is connected in the supply line such that all line current flows through the reactor, Line Current Line Reactors are current-limiting devices and oppose rapid changes in current because of their impedance. They hold down any spikes of current and limit any peak currents. This resistance to change is measured in ohms as the Line Reactor's AC impedance (XL) and is calculated as follows: harmonic frequency examples: L = reactor inductancein henries (H), millihenries (mH) — H x 10-3, microhenries (uH) By inspection of the XL formula, the Line Reactor is directly proportional to the frequency (f) and the inductance (L). That is, if the impedance of a Line Reactor is 10 ohms at 60 Hz, then at the 5th harmonic (300 Hz) the impedance is 50 ohms. If the inductance (L) is increased, then the impedance will increase This increase in Line Reactor impedance will reduce the current in the line. The higher the frequency (Hertz), the lower the current. A Line Reactor's DC resistance (R-ohms) is very low by design so that the

Open the catalog to page 1

Line Reactors are rated by % impedance, voltage and current. However, they are sized by % impedance, voltage and motor horsepower. The motor horsepower determines the necessary current rating for the Line Reactor. Line Reactors are rated by impedance, voltage and current. Impedance (% impedance of load Z) The load impedance (Z) is calculated by this formula: Z = V/I, whereZ = load impedance(ohms), V = line voltage(volts), andI = line current(amps) This percent of load impedance also determines the voltage drop across the Line Reactor. For example, a 5% Line Reactor would have a 5% voltage drop....

Open the catalog to page 2