Device for filtering harmonics
A power device is provided for filtering or dampening harmonics and optimizing the power factor in power distributions systems. A device for a 3-phase power system comprises series inductors able to communicate between an AC power source and a non-linear load. Connected in parallel to the series inductors, at the junction with the non-linear load, are shunt inductors used to trap harmonic currents. Power factor correction capacitors are connected to the ends of the shunt inductors. The series inductor and shunt inductor are used to form a coaxial reactor assembly, which further comprises a reactor core. The coaxial reactor assembly is formed by winding a first inductor around the core and then winding a separate second inductor around the perimeter of the first inductor. In another embodiment, the device includes a third inductor to achieve better dampening and power factor performance.
1. A device for dampening harmonics, the device being electrically connectable to at least one power source and at least one non-linear load, the device comprising:
a first inductor comprising a first end being connectable to said at least one power source and a second end being electrically connectable to said at least one non-linear load;
a second inductor comprising a first end electrically connected to said first or said second end of said first inductor and a second end electrically connected to at least one capacitor; and,
wherein said first and second inductors are in a coaxial arrangement comprising two layers wound around a core, said layers comprising:
an inner layer adjacent to said core, said inner layer comprising one of said inductors, and
an outer layer provided over said inner layer, said outer layer comprising the other of said inductors.
2. The device of claim 1 , wherein said first end of said first inductor is a start of winding and said second end of said second inductor is another start of winding.
3. The device of claim 1 , wherein said first end of said first inductor is a start of winding and said first end of said second inductor is another start of winding.
4. The device of claim 1 , wherein said inner layer comprises said first inductor and said outer layer comprises said second inductor.
5. The device of claim 1 , wherein said inner layer comprises said second inductor and said outer layer comprises said first inductor.
6. The device of claim 1 , wherein said second inductor comprises a wire with a smaller cross-sectional area than said first inductor.
7. The device of claim 1 , wherein said first end of said second inductor is connected to said second end of said first inductor.
8. A three-phase power distribution system comprising three phase assemblies, wherein each phase assembly comprises the device according to claim 1 .
9. A device for dampening harmonics, the device being electrically connectable to at least one power source and at least one non-linear load, the device comprising:
a first inductor and a second inductor, each comprising a first end and a second end, wherein:
said first end of said first inductor being electrically connectable to said at least one power source;
said second end of said first inductor is electrically connected to said first end of said second inductor;
said second end of said second inductor being electrically connectable to said at least one non-linear load;
and said second end of said first inductor and said first end of said second inductor both electrically connected to at least one capacitor; and,
wherein said first and second inductors are in a coaxial arrangement comprising two layers wound around a core, said layers comprising:
an inner layer adjacent to said core, said inner layer comprising one of said inductors, and
an outer layer provided over said inner layer, said outer layer comprising the other of said inductors.
10. The device of claim 9 , wherein said second end of said first inductor is a start of winding and said first end of said second inductor is a start of winding.
11. The device of claim 9 , wherein said inner layer comprises said first inductor and said outer layer comprises said second inductor.
12. The device of claim 9 , wherein said inner layer comprises said second inductor and said outer layer comprises said first inductor.
13. The device of claim 9 , wherein said second inductor comprises a wire with a smaller cross-sectional area than said first inductor.
14. A three-phase power distribution system comprising three phase assemblies, wherein each phase assembly comprises the device according to claim 9 .
15. A device for dampening harmonics, the device being electrically connectable to at least one power source and at least one non-linear load, the device comprising:
a first inductor, a second inductor and a third inductor, each comprising a first end and a second end;
said first end of said first inductor being electrically connectable to said at least one power source and said second end of said first inductor electrically connected to said first end of said third inductor;
said second end of said third inductor being electrically connectable to said at least one non-linear load;
said first end of said second inductor electrically connected to said first or said second end of said first inductor;
said second end of said second inductor electrically connected to at least one capacitor; and,
wherein two of said inductors are in a coaxial arrangement comprising two layers wound around a first core, said layers comprising:
an inner layer adjacent to said core, said inner layer comprising one of said inductors, and
an outer layer provided over said inner layer, said outer layer comprising the other of said inductors.
16. The device of claim 15 , wherein the remaining one of said three inductors is coaxially provided as a third layer over said outer layer.
17. The device of claim 15 , wherein the inner and outer layers cover a first section of the first core and wherein the remaining one of said three inductors is wound over a second section of the first core and separated from the inner and outer layers.
18. The device of claim 15 , wherein the remaining one of said three inductors is wound around a second core.
19. The device of claim 18 , wherein said first and second inductors are wound around the first core, and said first end of said first inductor is a start of winding and said second end of said second inductor is another start of winding.
20. The device of claim 18 , wherein said first and second inductors are wound around the first core, and said first end of said first inductor is a start of winding and said first end of said second inductor is another start of winding.
21. The device of claim 18 , wherein said inner layer comprises said first inductor and said outer layer comprises said second inductor.
22. The device of claim 18 , wherein said inner layer comprises said second inductor and said outer layer comprises said first inductor.
23. The device of claim 15 , wherein said first end of said second inductor is connected to said second end of said first inductor.
24. A three-phase power distribution system comprising three phase assemblies, wherein each phase assembly comprises the device according to claim 15 .