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Summary of LTDS changes for May 2017

1.  Key changes to the network

Key changes to the network from the November 2016 update are detailed in the table below:

Site affected

Summary of changes

Impact of changes on network

Hartshead-Heyrod 33kV switchgear replacement

Replacement of 33kV switchgear to address a fault level issue.

Operational restriction due to fault level issue at Hartshead-Heyrod BSP have been lifted. In addition running arrangements at Stalybridge GSP which were changed to alleviate the fault level issue at Hartshead-Heyrod BSP will be reviewed.

Poulton primary transformer changes

Condition based replacement of primary transformers replacing 10/14MVA units with modern equivalent units rated at 11.5/23MVA.

Firm capacity at the primary substation increases to 21MVA.

Spring Cottage primary transformer changes

Condition based replacement of primary transformers replacing 10/14MVA units with modern equivalent units rated at 11.5/23MVA.

Fault level at the primary HV busbars is reduced due to the new transformer units having a higher impedance than the previous units. Operational restriction for break fault level issues has now been lifted as a result.


The relevant tables have been updated to show the above changes.

Access to the relevant tables is via the detailed information secure login section of the LTDS.

2. Network Development Proposals approved since November 2016 LTDS update

Network development proposals approved since the November 2016 update are provided in the detailed information secure login section of the LTDS.

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