Tender

Rotary Frequency Converter

KBS MARITIME LTD

This public procurement record has 1 release in its history.

Tender

08 Jun 2026 at 14:01

Tender Notice
Summary of the contracting process

The contracting authority, KBS Maritime Ltd, based in Portsmouth, is inviting tenders for the design, construction, and installation of a 5MVA Rotary Frequency Converter. This procurement falls under the industry category of electric rotary converters and related frequency converters, classified by CPV codes 31121111 and 32552420, respectively. The procurement method is selective, employing a restricted procedure. This tender is currently in the active tender stage, with crucial deadlines set, including a closing date for tender submissions on 10th July 2026. The chosen supplier will commence work on this £2,000,000 contract starting 11th July 2026, with completion by 31st July 2027. The project is open to suppliers in a range of locations, including the British Overseas Territories, the Channel Islands, Europe, the Isle of Man, the United Kingdom, and other global regions.

This opportunity presents substantial growth potential for businesses specialising in electrical and mechanical engineering, particularly those with expertise in manufacturing and installing high-capacity synchronous machinery. Given the complex requirements, such as the capability to rotate the generator stator and manage the inrush current via external control systems, the tender would be suitable for established firms with a proven track record in similar projects. While the procurement process favours a restricted procedure, offering a more competitive selection, it prioritises organisations capable of delivering robust technical solutions. Small and medium-sized enterprises (SMEs) and voluntary, community, and social enterprises (VCSEs) may not find this contract suitable, suggesting an emphasis on larger or more experienced engineering companies.

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Notice Information

Notice Title

Rotary Frequency Converter

Notice Description

We require a rotating machine manufacturer to design, build and install a 5MVA 11kV 50Hz to 6.6kV 60Hz Rotary Frequency Convertor. Both machines shall be synchronous with a mechanical coupling joining the 10-pole motor to the 12-pole generator. There is a requirement to be able to physically rotate the generator stator to enable manipulation of the phase and load angle via racking motor or actuator. The machine should come complete with a starting reactor and contactor connected to the neutral point of the motor, to limit the inrush current on startup to approximately 400A. Control of the machine starting reactor and racking equipment shall be by an external control system, which shall not form part of the machine scope of supply.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-b5fd17-1af1ba70-1cd2-49c5-93ca-e064a416280a
Publication Source
Contracts Finder
Latest Notice
https://www.contractsfinder.service.gov.uk/Notice/cb4187fa-1f56-4e0a-802b-38148d143d40
Current Stage
Tender
All Stages
Tender

Procurement Classification

Notice Type
Tender Notice
Procurement Type
Standard
Procurement Category
Goods
Procurement Method
Selective
Procurement Method Details
Restricted procedure
Tender Suitability
Not specified
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

31 - Electrical machinery, apparatus, equipment and consumables; lighting

32 - Radio, television, communication, telecommunication and related equipment

CPV Codes

31121111 - Electric rotary converters

32552420 - Frequency converter

Notice Value(s)

Tender Value
£2,000,000 £1M-£10M
Lots Value
Not specified
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
8 Jun 20264 days ago
Submission Deadline
10 Jul 20264 weeks to go
Future Notice Date
Not specified
Award Date
Not specified
Contract Period
10 Jul 2026 - 31 Jul 2027 1-2 years
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Not Specified
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
KBS MARITIME LTD
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
PORTSMOUTH
Postcode
PO1 3LS
Post Town
Portsmouth
Country
England
Major Region (ITL 1)
TLJ South East (England)
Basic Region (ITL 2)
TLJ3 Hampshire and Isle of Wight
Small Region (ITL 3)
TLJ31 Portsmouth
Delivery Location
Not specified
Local Authority
Portsmouth
Electoral Ward
Charles Dickens
Westminster Constituency
Portsmouth South

Further Information

Open Contracting Data Standard (OCDS)

View full OCDS Record for this contracting process

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts. 

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