Filter Reactor

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Uses
Harmonics are unwanted energy losses generated by non-linear loads in a power system. A harmonic filter, typically enclosed in a metal cabinet, is often used to remove harmonics from the circuit. This filter consists of a filter reactor connected in series with a capacitor bank, forming a complete filter circuit tuned to a specific resonant frequency in order to absorb harmonic currents at the corresponding harmonic frequency.

Standards
1.GB/T 10229-1988
2.IEC 289: 1987

As we mentioned above, harmonics are mainly caused by non-linear loads and components. These elements include the rectifier, variable speed drive, and transformer, which are typically called the source of harmonics. Harmonics have a detrimental effect on the power system as well as the electric loads connected to the system. That is why we should use a filter reactor, which is then connected to the capacitor bank, to eliminate harmonics and improve the power factor of a system.

Operating Conditions
1. Altitude: No more than 2000m
2. Ambient temperature: -25°C~ 45°C
3. Relative humidity: below 90%
4. Workplace should be free of flammables, explosives and hazardous gases.
5. The filter cabinet should be well ventilated.

Key Performance Parameters
1. Used in 400V, 660V power systems
2. Rated dielectric strength: 3kV/min
3. Temperature limits: iron core, no more than 85K; coil, no more than 95K
4. Noise level: no more than 45dB
5. Reactance difference between any two phases: no more than ±3%
6. Insulation level: Class h, at 180°C
7. Quality factor: 40

Technical Specs
The filter reactor does not have definite specs to follow, as each should be custom designed. Here we take a three-phase filter reactor as an example. But note that data below are for reference only.

Model No.	Reactor Inductance ( μH )	Capacitor Capacitance ( μF )	Ordinal Number of Harmonic	Rated Current (A)	Dimensions L×W×H (mm)	Installation (mm)
-0.4-25/1986	1986	231	5^th	25	225×155×200	175×95
-0.4-31/1582	1582	290	5^th	31	225×160×200	175×95
-0.4-37/1318	1318	346	5^th	37	250×170×200	200×100
-0.4-50/981	981	462	5^th	50	265×190×215	215×120
-0.4-62/790	790	579	5^th	62	280×205×230	230×125
-0.4-74/659	659	692	5^th	74	280×210×260	230×125
-0.4-93/527	527	861	5^th	93	285×200×290	215×125
-0.4-112/438	438	1027	5^th	112	265×200×355	215×125
-0.4-124/396	396	1137	5^th	124	265×205×280	215×125
-0.4-149/329	329	1385	5^th	149	280×220×420	230×145
-0.4-186/264	264	1770	5^th	186	330×230×420	290×145
-0.4-248/198	198	2275	5^th	248	325×285×480	265×175
-0.4-310/58	158	2895	5^th	310	350×330×520	290×205
-0.4-372/132	132	3539	5^th	372	420×350×545	360×245

7th Harmonic Filter Reactor

Model No.	Reactor Inductance ( μH )	Capacitor Capacitance ( μF )	Ordinal Number of Harmonic	Rated Current (A)	Dimensions L×W×H (mm)	Installation (mm)
-0.424/1009	1009	231	7^th	24	205×155×155	155×95
-0.4-30/810	810	290	7^th	30	205×165×155	155×95
-0.4-36/676	676	346	7^th	36	235×165×160	185×95
-0.4-48/506	506	462	7^th	48	250×175×175	200×100
-0.4-61/402	402	579	7^th	61	250×185×195	200×100
-0.4-73/337	337	692	7^th	73	265×200×195	215×110
-0.4-91/269	269	861	7^th	91	235×158×240	185×110
-0.4-109/225	225	1027	7^th	109	235×185×260	185×110
0.4-121/191	191	1137	7^th	121	238×190×280	185×110
-0.4-146/159	159	1385	7^th	146	250×205×315	200×125
-0.4-182/127	127	1770	7^th	182	250×210×340	200×125

Please do let us know if your filter reactor is to be used in a medium-frequency induction heating furnace due to its special nature.

5% taps can be added along the transformer winding (to fine-tune the filter for different resonance frequencies). If need those winding taps, be sure to mention it upon asking a price quote. Taps are metal loops you would see on the transformer winding. 5% tap means the tap adjusts turns ratio in 5% increment.

This filter reactor is mainly used in an active harmonic filter.