48
451253/A
Mains power
This section presents the requirements for mainspower to the SBP 29 transceiver unit.
The SBP 29 transceiver is designed for 3-phase input power, even though none of the
components in the transceiver are using 3-phase: the 3-phase input power is simply
a means to distribute the load on the electrical power system more evenly. It is the
peak load when the SBP is pinging that constitute the main challenge to the electrical
power distribution system. The high voltage power for the SBPs is modular, and we take
advantage of this by distributing the modules (High Voltage Power Units, HVPUs) over
the three phases. The number of HVPUs are 4, 2, and 1, for the 3, 6, and 12 degree
systems, respectively. Since the number of HVPUs in a system is not a multiple of three,
this means load sharing is not even between the three phases. As can be seen from the
peak line currents listed below, 3-phase Y (Wye) 400 VAC offers the best load sharing.
Note
For 3-phase 400 VAC the neutral is mandatory, as this is required to provide 230 VAC
used internally in the SBP transceiver. Only wye, not delta, can be used with 3-phase
400 VAC.
Because the smallest system (12 degree TX) has a single high voltage power unit there is
very little to gain from load sharing in this case. To simplify installation of this smallest
system single-phase power input is available for this model.
Mains power alternatives:
Available for:
3-phase wye (Y) 400 VAC
SBP 29 system
3-phase delta (Δ) 230 VAC
SBP 29 system
1-phase 230 VAC
SBP 29 with a 12 degree TX
The table below lists the peak power and the peak line currents required by the
transceiver when pinging. Maximum duration of the peaks is 100 milliseconds limited
by the maximum pulse length for the system. The average power requirement listed is
calculated for pinging with maximum power and the maximum duty cycle of 10 per cent.
Peak line currents
Peak power
Max average power
Voltage
Fre-
que-
ncy
TX
3°
TX
6°
TX
12°
TX
3°
TX
6°
TX
12°
TX
3°
TX
6°
TX
12°
[VAC]
[Hz]
[A]
[kW]
3-phase Y
385 – 415
50 –
60
33
16
16
3-phase Δ
220 – 240
50 –
60
44
28
17
1-phase
220 – 240
50 –
60
-
-
18
14.7
7.5
4
1.9
1.1
0.7
SBP 29 Installation Manual
Summary of Contents for SBP 29
Page 1: ...451253 A November 2019 Kongsberg Maritime AS SBP 29 Sub bottom profiler Installation Manual ...
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Page 112: ...112 451253 A Figure 13 307904 SBP 29 Installation Manual ...
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