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Immingham Storage Company Limited – East Terminal
No.7 Switchroom - Basis of Design
P & I Design Ltd
DOCUMENT NO: SI451001_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 10.08.12
Tel: + 44 (0)1642 617444
PAGE 9 OF 12
Fax: + 44 (0)1642 616447
www.pidesign.co.uk5.2
New ABP 11kV Supply not Available
If a new 11kV supply is not available from ABP, there are two scenarios
1.
The existing 11kV supply cannot be uprated
2.
The existing 11kV supply capacity can be increased
In either scenario, the desire is to increase the LV capacity available at No.7 switchroom.
The first step is to transfer the 3.3kV load from the existing transformer at No.3
switchroom to the transformer at No.5 switchroom. This can be achieved by
a.
Relocating the 3.3kV starters to No.5 switchroom 3.3kV Switchboard
b.
Re-supplying the 3.3kV starters in their current location from 3.3kV Board in No.5
Switchroom
The costs involved include :
Option (a) includes switchboard modifications and pump re-cabling, but the
existing No.3 Switchroom can then be used to house new LV switchboards.
Option (b) would require a new LV switchroom to be built adjacent to No.3
Switchroom, in addition to switchboard modifications and cabling requirements.
These two options will require costing in their entirety to permit a decision to be
made.
When the 3.3kV load has been removed from the existing 11kV supply then a new
11000/400V transformer can be installed, either
1.
Sized to utilise the existing 11kV capacity, thus increasing the LV capacity in the
system (from 350kVA to 850kVA) due to the 11kV supply no longer also
supporting the 3.3kV load.
2.
Sized to utilise any increased 11kV capacity made available by ABP. (>850kVA)
In both cases the new transformer would supply an LV board for onward distribution to
No.7 Switchroom. A single line diagram below shows this solution. Note : The decision to
re-supply No.6 switchroom is discussed in section 5.4.
11kV Supply From ABP
11,000 /
400V
No.7 Switchroom
LV Switchboard
No.6 Switchroom
3200A
MCC 1
MCC 2
630A 630A
Aquabio
630A 400A
LV
Board
(Ex
Switch
AC)
LV
Board
(Ex
Switch
EE)
400A 630A
Spare
630A
Spare
1250A
No.3 Switchroom
Future Spares