—————— TPD32-EV ——————
104
4.10.3 Mains harmonic currents generated by converters
Information about mains harmonic currents generated by fully-controlled (six-pulse) three-phase SCR
bridge AC/DC converters.
Given their non-linear load, SC AC/DC converters draw non-sinusoidal current from the mains and thus create
harmonic current.
The exact calculation of the harmonic current in a system depends on a number of factors that are linked to the
actual system and the point at which the converter is installed. For more details reference should be made to EN
61800-3, IEC 146-1-2 or EN 61800-1 (annex B).
Purely by way of example, some “typical” harmonic current values measured in practice and referring to the
fundamental value (I
1
) are provided below..
Harmonic order
h
I
h
/ I
1
[%]
5
24 ... 28
7
5 ... 10
11
8 ... 9
13
4 ... 6
17
4.5 ... 5
19
3 ... 3.5
4.11 ENGINEERING NOTES
TBO
Analog outputs
1
2
1
2
3
4
Digital outputs
1
2
3
4
5
6
7
8
9
10
Supply
Digital inputs
15
11
12
13
14
1
2
3
4
1 2
3 4
5 6
Analog inputs
12
13
14
15
16
Enables
11
XE
2
7
2
19
18
+
2
4
V
0
V
2
4
9
0
V
1
0
+
1
0
V
-
1
0
V
7
8
Reference
Supply dig. I/O
R-TPD3
XE
1
7
9
+ 15 V
+ 5 V
± 15 V
Sinusencoder
Digitale
encoder
0
V
0 V
Figure 4.11.1: Potentials of the regulator section
Potentials of the regulator section
The potentials of the regulator section are galvanic divided from the power section. Figure 4.11.1 shows their
connection.
- The analog inputs are designed as differential.
- The enables are isolated from the regulation via optoisolators. The terminals 12 to 15 have terminal 16 as a
common reference potential.
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