No.7 Switchroom Supporting Design Documentation

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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 7 OF 12
Fax: + 44 (0)1642 616447
5 FURTHER PROPOSALS
It would be desirable to improve the LV capacity to No.7 switchroom. Several options are
available but the decision as to which option is taken depends on a number of factors,
therefore so far as initial phases of work are concerned it is important that the proposals do
not prohibit any of the future options and do not require extensive retrospective work that
would be wasteful financially.
From the flowchart below, showing the decision making process, it can be seen that the
key decisions rely on a response from ABP as to the availability and capacity of HV
supplies. It can also be seen that certain tasks are common regardless of the response from
ABP, an example being the work performed to date in providing a new LV switchboard in
No.7 Switchroom (highlighted green).
START
Provide new LV Switchboard in
No.7 Switchroom
Complete other works as
detailed in Section 5.3
After each step, check if ABP
decision reached before
proceeding to next step
New 11kV Supply available
from ABP ?
No
Decision from ABP re. New
11kV Supply or Increased
Capacity 11kV Supply ?
Yes
No
END
Provide new transformer
adjacent to No.7 Switchroom,
ideally 2MVA & connect to LV
Switchboard, retiring feed
from No.3 switchroom
Complete remaining works as
detailed in Section 5.3
Increased Capacity available
on existing 11kV supply ?
Build new Switchroom
adjacent to No.3.
Transfer LV Loads from No.3
Switchroom.
On completion No.3
switchroom dedicated to
3.3kV, fed from existing
11000/3300/415V transformer
(415V tapping no longer used)
Provide Supply to new
Switchroom from No.7
Switchroom LV Board.
Yes
Re-supply No.6 switchroom
from No.7 switchroom and
retire ABP fed LV supply to
No.6 switchroom
Provide increased LV capacity by
moving 3.3kV load to No.5
Switchroom and provide larger
400V transformer on existing 11kV
supply.
Cost and assess feasibility of
Options (see section 5.2)
Provide new 11000/400V
transformer adjacent to No.3
Switchroom to suit increased
capacity
Yes
Option 1
Re-locate 3.3kV starters to
No.5 Switchroom
Option 2
Retain 3.3kV starters in No.3
Switchroom and re-supply
from No.5 Switchroom
Build new LV Switchroom
adjacent to No.3 Switchroom.
Fit out with LV boards.
No.3 Switchroom becomes
dedicated 3.3kV
Provide new 11000/400V
transformer adjacent to No.3
Switchroom to suit existing
capacity
No
Supply No.7 Switchroom LV
Board from new LV board fed
from new transformer,
retiring feed from switch EE
Fit out existing No.3
Switchroom with new LV
boards
Complete remaining works as
detailed in Section 5.3
Transfer LV Loads from No.3
Switchroom to new LV Boards
If additional LV capacity
sufficient. Re-supply No.6
switchroom from No.7
switchroom and retire ABP fed
LV supply to No.6 switchroom