TRANSFORMER APPLICATION

Transformers for Metro Stations

Prepare a transformer enquiry for metro station auxiliary power: lighting, ventilation, escalators, pumps and other station services. Start with the project task, electrical duty and equipment-room constraints. This page covers station-service distribution, not traction transformers, traction rectifiers or equipment installed on trains.

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Start with your project task

Specify auxiliary supply for a new station

A new station needs a transformer requirement that fits its electrical distribution and building-services design. Define the station loads and the equipment boundary before treating a general metro specification as a complete purchase brief.

Send these inputs: Station single-line diagram, auxiliary load schedule, required voltages and frequency, proposed transformer rating, quantity, room drawings, construction stage and the owner's current equipment specification.
Review and coordination: Identify the normal and alternative supply arrangements and the loads assigned to this transformer. Coordinate the proposed equipment with the station electrical room, downstream switchboards and project design responsibilities; keep traction equipment outside this enquiry.
Expected output: A station-service RFQ with an agreed equipment role, a stated load basis and the missing inputs needed before selecting a configuration.

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Replace an existing station transformer

A matching nameplate rating does not establish that a replacement will fit a working station. Existing connections, restricted equipment access and the route for removing the old unit need to be reviewed alongside the electrical requirement.

Send these inputs: Existing nameplate and test records where available, as-built drawings, cable or busbar interfaces, equipment dimensions and mass, measured delivery and removal routes, door and turning restrictions, and the operator's permitted work window.
Review and coordination: Compare retained electrical and mechanical interfaces with the proposed replacement. Identify survey gaps and drawing changes before committing to installation arrangements. Switching, isolation, temporary supply and work sequencing remain under the operator's authorized procedures.
Expected output: A replacement interface and access checklist, with the drawings and owner decisions needed to avoid unresolved site assumptions in the order.

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Add or change station service loads

Additional ventilation equipment, escalators, pumps or passenger-service facilities can change the transformer duty. Existing spare capacity should not be assumed from the original rating or from a simple addition of equipment nameplates.

Send these inputs: Present load records, the revised load schedule, new equipment input data, motor starting methods, drive or UPS details, simultaneous operating assumptions, planned construction phases and any proposed changes to the supply arrangement.
Review and coordination: Have the project designer establish the revised capacity and electrical performance basis. Identify whether the existing supply concept, room cooling, terminals or monitoring must change, and separate confirmed requirements from future allowances.
Expected output: A change-specific enquiry and a list of electrical, space and interface decisions to resolve before comparing an additional or replacement transformer.

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Conditions that affect configuration

Station-service loads and operating states

Lighting and electronic loads, motors and auxiliary systems do not all present the same duty. Normal service and an approved alternative supply arrangement may also load the transformer differently. Station count or passenger volume alone cannot describe those conditions.

Information to provide: Load groups and operating-state descriptions, motor starting and duty data, drive or UPS input characteristics, available harmonic information, and the designer's demand assumptions. Include specified losses, voltage performance and other acceptance conditions rather than selecting a universal metro rating.

Underground room conditions and fire strategy

An oil-free design does not remove the need to coordinate heat rejection, enclosure airflow and the station's fire requirements. Humidity, condensation, dust and possible water exposure also need explicit review; the word underground is not an environmental specification.

Information to provide: Room layout and ventilation concept, ambient temperature and altitude, moisture and dust conditions, potential water exposure, required enclosure and insulation performance, and the applicable project fire requirements. State the evidence and test classifications requested by the owner; do not assume an enclosure label proves every condition.

Space, maintainable access, noise and vibration

The final footprint is only part of the installation requirement. Connections, inspection access and future removal need space too. A room near a platform, control area or occupied building may require defined acoustic or vibration criteria.

Information to provide: Available floor area and loading limits, access and maintenance clearances, handling constraints, mounting arrangement and nearby occupied areas. Provide any sound or vibration requirement with its measurement conditions, and review dimensions and mass against the actual equipment route.

Terminals, protection and station monitoring

Connections and accessory signals must match the surrounding switchgear and station control systems. A temperature controller or communication option does not by itself establish complete SCADA integration or protection coordination.

Information to provide: Terminal orientation and cable or busbar drawings, earthing arrangement, fault data, vector group and impedance where specified. Include alarm, trip and temperature signals, fan controls if required, auxiliary power requirements, receiving system and protocol, and the party responsible for integration.

Explore suitable product options

Dry-type transformers

Explore oil-free equipment for a station electrical room where it is permitted by the project specification. Confirm the actual duty, cooling, enclosure, environmental and fire-performance requirements; indoor or underground use alone does not establish that a particular model is suitable.

Review product range

Oil-immersed transformers

Consider this category only for a station-service installation where the project permits liquid-filled equipment and defines the location, containment, separation and access requirements. This category link is not an offer for traction or rectifier-transformer duty.

Review product range

Documents by project stage

RFQ and like-for-like quotation

State the station and equipment role, specification revision, quantity, destination and schedule. Compare the same electrical duty, enclosure, accessories, drawings, losses, tests and exclusions. Include the owner's qualification or approval requirements as items to verify, not as approvals implied by an application label.

Stage: quotation

Configuration and interface agreement

Agree the offered configuration's data sheet, outline, mass, mounting and terminal drawings. Resolve room-cooling, access, cable and monitoring interfaces with the responsible station teams. Record deviations and the accepted document revision before the order relies on those details.

Stage: design approval

Inspection and station handover

Agree the required factory records, inspection scope, manuals, accessory information and packing documents. Confirm delivery access and the receiving party's requirements. Installation, commissioning, integrated station-system tests and operational acceptance require separate project responsibilities and approved procedures.

Stage: delivery

Scope and coordination

The offer covers transformer equipment and documents expressly included in the quotation. Traction supply, rectifiers, rolling-stock equipment, station fire and ventilation systems, backup supply, protection coordination and SCADA integration are separate responsibilities unless specifically agreed. The operator and project team retain control of work permits, switching and station acceptance. Transformer supply alone does not guarantee continuous train or station operation.

Questions before requesting a quotation

Is a station auxiliary transformer the same as a traction transformer?

No. Station auxiliary distribution supplies station-service loads. Traction transformers and rectifier equipment serve a different electrical duty associated with powering trains. Send the single-line diagram and identify the connection point so the enquiry is directed to the correct equipment scope.

Does dry-type mean fireproof or suitable for every underground room?

No. Oil-free construction is one selection characteristic, not proof of complete fire safety or universal environmental suitability. The required equipment performance, enclosure, room ventilation, installation conditions and supporting evidence must be reviewed against the actual station specification.

Can I choose capacity from station area or passenger numbers?

Those figures are not a complete electrical load basis. The project designer should establish the rating from the station load schedule, operating states and planned changes. Include motor and electronic-equipment duty rather than relying on an application-wide capacity range.

Can I enquire while station drawings are still being developed?

Yes. Share the project task, known electrical requirements, room or access information, quantity, destination and schedule. An available document link is optional. Clearly mark open decisions so an initial discussion does not turn an unverified configuration into a final commitment.

Send your project requirements

Share the voltage, capacity, installation conditions and project specification. A document link is optional.

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