Requirements And Limit Values For Harmonic Currents; Preparing The Electrical Connection - Wilo Stratos GIGA Einbau- Und Betriebsanleitung

8.2 Requirements and limit values for
harmonic currents
8.3

Preparing the electrical connection

Installation and operating instructions • Wilo-Stratos GIGA, Wilo-Stratos GIGA B • Ed.01/2023-05
Power P
N
11 kW
15 kW
18.5 ... 22 kW
Table 8: Maximum permissible fuse protection
Circuit breaker
The use of a circuit breaker is recommended.
NOTICE
Circuit breaker trigger characteristic: B
Overload: 1.13 – 1.45 x I
Short-circuit: 3 – 5 x I
Residual-current device (RCD)
This pump is equipped with a frequency converter. Therefore, it must not be protected
by a residual-current device. Frequency converters can impair the function of residual-
current-operated protection circuits.
Exception: Residual-current devices which have a selective type B universal-current-sens-
itive version are allowed:
• Labelling:
• Trigger current: > 300 mA
All pumps of this series are intended for professional use. When connected to the low-
voltage mains, the following standards apply:
• IEC 61000-3-2 for devices with a phase current ≤ 16 A
• IEC 61000-3-12 for devices with a phase current between 16 A and 75 A
Pumps in efficiency classes 11 ... 22 kW are subject to special connection conditions be-
cause an R of 33 at the connection point is not sufficient for their operation. The pumps
SCE
have been assessed based on table 4 of the standard ("three-phase devices under special
conditions").
For all public connection points, the short-circuit power S
user's electrical installation and the mains must be greater than or equal to the values spe-
cified in the table. It is the responsibility of the installer or the user, with the assistance of
the grid operator if necessary, to ensure that such pumps are operated properly. If the
pumps are used industrially on a factory medium voltage feeder, the connection conditions
are solely the operator's responsibility.
Motor power [kW]
11
15
18.5
22
Table 9: Required short-circuit power S
NOTICE
A suitable harmonic filter between the pump and supply network reduces
the amount of harmonic current.
Establish electrical connection using a fixed mains connection cable. The mains cable must
have a plug device or an all-pole switch with a contact opening width of at least 3 mm.
If flexible cables are used, e.g. mains connection cables or communication cables, use fer-
rules.
Max. fuse [A]
25
35
50
nom
nom
at the interface between the
SC
Short-circuit power S
SC
[kVA]
≥ 1800
≥ 2400
≥ 3000
≥ 3500
SC
en
117