![]() To avoid this problem, it is common to insert reactors in series with capacitor banks. The reactor also by its nature will safeguard capacitor and associated switch gears against switching inrush, which other may damage capacitors, circuit breakers and contactors. Presence of Harmonic distortion due to the non-linear loads within the network or due to import of harmonic from grid or power source will increases the current flowing through capacitors as the capacitive reactance is inversely proportional to the frequency, consequently capacitors will be subjected to over load. The over load on capacitors can cause premature failure in capacitor due to increased voltage and thermal stress on dielectric. ![]() On the other hand, the inductive reactance XL of a Reactor is directly proportional to frequency: The magnitude of inductive reactance will increase with high frequency harmonics thus blocking the harmonic current. Hence, use of detuned reactor in series with capacitor will offer higher impedance for harmonics, thus eliminating risk of over load in capacitors. The inductance value of detuned reactor is selected such that the resonance frequency is less than 90% of dominant harmonic in the spectrum. For example: if 5 th harmonic is dominant in the spectrum, any series LC circuit having resonance frequency 90% of 250Hz (for 50Hz system), i.e. The typical benefits of a detuned reactor are as follows: What are the benefits of using a Detuned Reactor? if the natural resonance frequency of LC is less than 225Hz, it is categorized as detuned filters or detuned capacitors.
0 Comments
Leave a Reply. |