Introduction
20
Operating instructions RHF
ELTROPLAN
-
REVCON
Elektrotechnische Anlagen GmbH
4 Introduction into the subject filter modules
4.1 Function principle REVCON RHF
The REVCON RHF consists of a main inductor L
0
and a two-stage absorption cir-
cuit with the inductance L1 and L2 and the capacitors C1 and C2.
The absorption circuit eliminates harmonics starting at the fifth order and is specif-
ic for the designed supply frequency.
The filter performance in terms of THDI varies as a function of the load.
Figure 3: Function principle RHF
The REVCON RHF is available in two variants for two performance levels: RHF-B with
5% THDI (total current harmonic distortion) and RHF-A with 10% THDI. The strategy
behind the two levels is to offer a performance similar to 12 pulse rectifiers with the
RHF-A and a performance similar to 18 pulse rectifiers with RHF-B.
The filter performance in terms of THDI varies as a function of the load. At nominal
load the performance of the filter should be equal or better than 10% THDI for RHF-A
and 5% THDI for RHF-B.
At partial load the THDI has higher values. However, the absolute value of the har-
monic current is lower at partial loads, even if the THDI has a higher value. Conse-
quently, the negative effect of the harmonics at partial loads will be lower than at full
load. All THDI values are typical values and must be verified in accordance to chapter
3.1 .
