UKPN isolation of 132Kv Transformer NUTM T1 for network substation commissioning - Global Switch London

Scheduled Maintenance Report for Taiga Cloud status page

In progress

Scheduled maintenance is currently in progress. We will provide updates as necessary.
Posted Jun 01, 2026 - 08:00 UTC

Scheduled

Work Breakdown
01/06/26 circa 08.00 - Isolation of 132KV Transformer NUTM T1
10/06/26 circa 17.00 - Reinstatement of 132KV Transformer NUTM T1

Purpose of Project
To allow UK Power Networks (UKPN) to carry out external network substation commissioning.
Systems Impacted
No building impact is anticipated. All load will be transferred seamlessly onto 132KV Transformer
NUTM T2 with no loss of power
to customers.
Method of Procedure
The switching activities will be coordinated between UK Power Networks and Global Switch
via telephone contact. All switching will be carried out by UK Power Networks to
the Global Switch approved Method of Procedure to ensure a seamless operation when transferring
load from one
transformer to the other.
Work Permits:
This operation is carried out remotely by UK Power Networks and no permits are required.
Risk Analysis
The switching operations will be carried out by UK Power Networks Control and will be
seamless to the Global Switch infrastructure. All switching operations are carried out
upstream of London East incoming supplies and therefore the building will remain DRUPS/UPS
backed at all times.
Mitigation Measures
No switching operations will be permitted unless both UK Power Networks and Global Switch
are happy that the switching does not present any risk to the building load.
Back out Plan
No immediate back out is available once Transformer NUTM T1 is isolated. In the event of an issue
with NUTM T2
Transformer Global Switch will request UKPN to abort commissioning activities to allow NUTM T1 to
be
returned to service. Recovery time is estimated at 4 hours during working hours and 6 hours at any
other time.
Posted May 26, 2026 - 12:14 UTC
This scheduled maintenance affects: Taiga Cloud Network (Availability United Kingdom (cluster ndcloud-njoerd)).