RTL /RTLX line inductor for harmonic filtering
The problem
Frequency converters, drives, softstarters, and other non-linear loads generate harmonics and
commutation spikes in the electrical system. The harmonics and spikes are caused by the non
linear power consumption of the diode bridge at the input of such loads. These distortions
cause several problems in an electrical installation:
Problems caused by harmonics:
- Overheating of electrical cables and power transformers
- Voltage drop in cables
- Damage of capacitor banks
Problems caused by commutation spikes:
- Malfunctioning of PLC’s, computers, electronic and computer based equipment
- Damage of the capacitors in the frequency converter, causing premature fall out
Note that commutation spikes are often invisible in measurements due to their short duration.
Problems due to commutation spikes are therefore often confused with harmonic problems,
however only filters that do eliminate the commutation spikes will provide a good solution.
The solution
POLYLUX line inductors, series RTL and RTLX filter the harmonics to a low level (approx.
50% reduction of 5th harmonic, 80% reduction of 7th harmonic). Additionally, the RTL and
RTLX line inductors completely eliminate the commutation spikes. Line inductors are the
easiest and most cost effective devices for solving due to harmonics and commutation spikes
caused by frequency converters, drives and soft starters.
RTL
Cast Resin, suitable for:
- humid and corrosive environments
- applications with elevated vibration levels
RTL/RTLX line inductors
POLYLUX, S.L.
RTLX
Impregnated
page 1
Filtering effect
Input current waveform of frequency
converter without line inductor
Input current waveform of frequency
converter with line inductor
Harmonic current spectrum frequency
converter without line inductor
Harmonic current spectrum frequency
converter with line inductor
Voltage waveform at input of frequency
converter without line inductor
RTL/RTLX line inductors
Voltage waveform at input of frequency
converter with line inductor
POLYLUX, S.L.
page 2
How to use
The line inductors should be installed at the input of the frequency converter. One line
inductor shall be used for each frequency converter, it is not possible to use one inductor for
several frequency converters. The line inductor is selected according to the rating of the
connected motor (not the rating of the frequency converter), see table. It is important not to
oversize the line inductor.
RTL / RTLX
line inductor
frequency
converter
M
other loads
M
motor
The advantages
-Avoid malfunctioning of PLC’s, computers, electronic devices
-Avoid voltage drop in the cables, improve your P.F.
-Avoid overload of cables and transformers
-Avoid failure in frequency converters
-Avoid damage of capacitor banks
-Energy saving thanks to reduced Irms
-Filtering of harmonics at the source, reducing the harmonics in the whole installation
RTL/RTLX line inductors
POLYLUX, S.L.
page 3
The products
RTL
RTL2,5
RTL4
RTL5
RTL6,3
RTL8
RTL10
RTL12,5
RTL16
RTL20
RTL25
RTL31,5
RTL40
RTL50
RTL63
RTL80
RTL100
RTL125
Reference
RTLX
RTLX2,5
RTLX4
RTLX5
RTLX6,3
RTLX8
RTLX10
RTLX12,5
RTLX16
RTLX20
RTLX25
RTLX31,5
RTLX40
RTLX50
RTLX63
RTLX80
RTLX100
RTLX125
RTLX160
RTLX200
RTLX250
RTLX315
RTLX400
RTLX500
RTLX630
Technical characteristics
Line voltage:
Line frequency:
Isolation:
Windings:
Test voltage:
Voltage drop:
Thermal overload:
Protection degree:
Ambient temperature:
Temperature rise:
Standards:
Includes:
In
(A)
2,5
4
5
6,3
8
10
12,5
16
20
25
31,5
40
50
63
80
100
125
160
200
250
315
400
500
630
L
(mH)
11,762
7,351
5,881
4,667
3,676
2,941
2,352
1,838
1,470
1,176
0,933
0,735
0,588
0,467
0,368
0,294
0,235
0,184
0,147
0,118
0,093
0,074
0,059
0,047
For motor rating
(kW)
(hp)
0,75
1
1,1
1,5
1,5
2
2,2
3
3
4
4
5,5
5,5
7,5
6,5
8,8
7,5
10
11
15
15
20
18,5
25
22
30
30
40
37
50
45
60
55
75
75
100
90
125
110 - 132
150 - 180
150 - 160
205 - 220
185 - 200
250 - 270
220 - 250
300 - 340
280 - 315
405 - 415
380 - 460V
50 - 60 Hz
Class F
Copper, Class HC-200ºC
3 kV (1 min, 50 Hz)
4% at 400V, 50Hz and nominal current
5%
RTL: IP-20, RTLX: IP-00
40ºC
<90ºC
IEC/EN 60289, CE
Bimetal thermal protection
POLYLUX S.L.
C/ Boters 3B - Parc Tecnològic del Vallès
08290 Cerdanyola del Vallés, (Barcelona) Spain
tel: +34-93-6926565
fax: +34-93-5809603
e-mail: polylux@polylux.com
http://www.polylux.com
RTL/RTLX line inductors
POLYLUX, S.L.
page 4