Reactors RL

CONSTRUCTION TECHNOLOGY

Three-phase harmonic block REACTOR with high linearity, designed and sized for a high harmonic load and tuned to the capacitors.
The RA-type Reactors ensure a lengthy service life, extremely low losses and low noise emission during operation.

• The CORE of the reactor consists of a magnetic plate made of topgrade iron with low-loss oriented grain with low losses.
• The WINDING is made with electrolytic copper conductors.
• IMPREGNATION is done in vacuum autoclave with special resins.
  The RA-type reactors have a tuning frequency of 189 Hz (p=7%), but other tuning frequencies can also be made on request; of course, in addition to the standard tuning frequency the main ones are 134Hz(p=14%) and 210 Hz(p=5.67%).

USES

Especially suited to make modular units (see CTF) and automatic power factor correction equipment (see ERAF) for networks with a harmonic load in association with power factor correction capacitors.
With the Capacitors, the RA series three-phase reactors have been conceived and designed to be installed in networks with harmonic distortion since their working principle consists of translating the resonance frequency of the installation under the harmonic of a lower magnitude so as to avoid triggering phenomena of resonance.

Series connection of the reactors to the capacitors, creates an oscillating circuit with a resonance frequency lower than worst harmonic component in the network; in most of the cases is the 5th harmonic.
The series circuit composed in this way will have the property to be inductive on the frequencies higher than tuning ones, avoiding in this way further resonances.
The tuning factor “p” defines the percentage ratio of the XL inductance and the reactance of the capacitor battery XC.

and determines also the resonance frequency “fA” between the reactance of the inductance and the capacitor battery.

That is the tuning frequency of the reactor – capacitor battery system.
Reactors of RA type, have for the lines at 50Hz a standard tuning frequency of 189Hz (p=7%), but also different tuning frequencies as 134Hz (p=14%) and 210Hz (P=5,57%).
It’s very important to remark that the installation in series of the harmonic blocking reactor to the capacitor causes an increase of the voltage on the capacitors; here below the formula to calculate the voltage on the capacitors “Uc”, on the base of network voltage “Un”, the degree of harmonic pollution in the network “Uh” and to the tuning frequency “p”.

Thus, the choice of the rated voltage of capacitors must be made on the base of the new “Uc” and the degree of harmonic pollution in the network”Uh. Here below the table with the main reactor types and related capacitor batteries associated to them.