INSTALLATION
SINUS K
INSTRUCTIONS
148/
191
13.5.
OPTIONAL INPUT-OUTPUT REACTORS
13.5.1.
I
NPUT
R
EACTOR
We suggest that a three-phase inductance, or a DCBUS DC inductance be installed on the supply line to obtain
the following benefits:
- limit input current peaks on the input circuit of the inverter and value di/dt due to the input rectifier and to the
capacitive load of the capacitors set;
- reducing supply harmonic current;
- increasing power factor, thus reducing line current;
- increasing the duration of line capacitors inside the inverter.
Figure 71: Wiring diagram for optional inductance.
Harmonic currents
The shapes of the different waves (current or voltage) may be expressed as
the sum of the basic frequency (50 or 60Hz) and its multiples. In balanced,
three-phase systems, only odd harmonic current exists, as even current is
neutralized by symmetrical considerations.
Harmonic current is generated by non linear loads absorbing non-
sinusoidal current. Typical sources of this type are bridge rectifiers (power
electronics), switched mode power supply and fluorescent lamps. Three-
phase rectifiers absorb line current with a harmonic content n=6K±1 with
K=1,2,3,… (e.g. 5th,7th,11th,13th,17th,19th, etc.). Harmonic current amplitude decreases when frequency
increases. Harmonic current carries no active power; it is additional current carried by electrical cables. Typical
effects are: conductor overload, power factor decrease and measurement systems instability. Voltage generated
by current flowing in the transformer reactance may also damage other appliances or interfere with mains-
synchronized switching equipment.
Summary of Contents for SINUS K
Page 186: ...INSTALLATION SINUS K INSTRUCTIONS 186 191 15 DECLARATIONS OF CONFORMITY...
Page 187: ...SINUS K INSTALLATION INSTRUCTIONS 187 191...
Page 188: ...INSTALLATION SINUS K INSTRUCTIONS 188 191...
Page 189: ...SINUS K INSTALLATION INSTRUCTIONS 189 191...