Damping resistors for harmonic filters are used to eliminate dangerous distortions (harmonics) that occur in the network due to the connection of a large number of electronic power converters.
The main problems caused by harmonics are:
Damping resistors, when used together with reactors and capacitors, help to reduce and filter harmonics.
The design of damping resistors depends on the required technical characteristics and operating conditions.
Damping resistors are calculated and designed individually in accordance with the customer’s technical specifications.
| Insulation voltage, kV | up to 110 |
| Resistance value, Ω | 1 ÷ 10000 |
| Continuous power, MW | up to 1 |
| Peak power, MW | up to 12 |
| Degree of protection | from IP00 to IP54 |
| Housing material | galvanized sheet steel / painted sheet steel / stainless steel |
| Resistor type | single-phase / three-phase |
APPLICATION AREAS:
PARAMETERS FOR CALCULATING A DAMPING RESISTOR:
PURPOSE OF DAMPING RESISTORS
Damping resistors are designed to suppress and dissipate the energy of electric and magnetic fields in the oscillatory circuit of an RLC harmonic filter, when current flows from the capacitor to the inductor and back until oscillations are completely damped due to active resistance losses. They also serve to reduce the dependence of the circuit’s operation on the power network impedance.
Current harmonics created by modern nonlinear loads can pose a serious problem for power supply networks and other consumers (loads) connected to the same networks as the harmonic generators. Harmonic components are currents with frequencies that are multiples of the fundamental supply frequency. Higher harmonics superimposed on the fundamental frequency distort the current waveform, which in turn distorts the voltage waveform in the system. Such distortions negatively affect power quality parameters, cause additional power losses, increase errors in electrical measuring instruments, reduce the service life of equipment and cable lines, and may cause unacceptable effects on other network loads (consumers).
Examples of higher harmonic generators include frequency converters of rolling mill drives, lighting systems with gas-discharge lamps, arc and induction furnaces, arc and contact welding installations, electrolysis production, etc.
