Manual Power Quality Filter PQFM Electrical design and installation 53
The internal power circuit protection characteristics for cULus filters are given in Table
23.
Table 23: Power circuit fuse characteristics for PQFM filters (cULus version)
network
voltage (Vrms)
type
(Arms)
(a)
(kA) at rated
voltage
Remark:
fuse short circuit current capability
The control circuit fuses characteristics for cULus versions of PQFM active filter are
given in Table 24.
Note: for CE versions, fuses are optional items.
Table 24: Control circuit fuse characteristics for PQFM filters (cULus version)
network
voltage (Vrms)
fuse type
(Arms)
(a)
(kA) at rated
voltage
Remark:
fuse short circuit current capability
6.7.3 Contactor type for different unit ratings
All PQFM units incorporate a main contactor. Depending on the filter rating, a different
contactor type may be used. Table 25 details the contactor type.
Table 25: Contactor type for different unit ratings
Associated main contactor
Central connection in cable entry
cubicle
Contactor in every power stage cubicle according to
cubicle rating
6.7.4 Optional surge arrester circuit (CE version only)
When the filter is equipped with a surge arrester circuit (optional), this circuit has its
own fuse protection with following characteristics:
Table 26: Surge arresters circuit (optional) protection fuses (CE version)
network
voltage (Vrms)
circuit protection
fuse type
(Arms)
(a)
(kA) at rated
voltage
striker
Remark:
fuse short circuit current capability
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