Off-load Tap Changers

Transformer components

Off-loadtransformertap changers

Specify the winding configuration, tap positions, phase arrangement, current path, and mounting interface. Confirm the final component against the transformer drawing and approved connection sequence.

Off-load transformer tap changer configuration component
Product configurations

Off-load tap changer configurations.

Four published product paths are shown for preliminary selection. Open a product record to review its source-backed technical parameters and drawing material.

Linear off-load tap changer
Product path 01

Off-load linear tap changers

Confirm the linear contact arrangement, terminal layout, and transformer integration conditions for the project.

View technical parameters
Off-circuit voltage regulation tap changer
Product path 02

Oil-immersed rotatable single-phase tap changers

Review the single-phase rotary interface, required tap positions, and transformer tank-cover arrangement.

View product + drawing
Three-phase rotary off-load tap changer
Product path 03

Oil-immersed rotatable three-phase tap changers

Review the transformer interface, phase arrangement, and off-circuit rotary adjustment requirement for the project.

View product + drawing
Transformer tap changer configuration component
Product path 04

Three-phase five-position rotary tap changers

Confirm the three-phase, five-position requirement and the transformer winding connection sequence before selection.

View product + drawing
Product path 01

Off-load linear tap changers

Confirm the linear contact arrangement, terminal layout, and transformer integration conditions for the project.

Products ParameterWST 30WST 63WST 125
Phase numberThree-phase
Connection modeCentral point
Rated through current (A)3063125
Short-circuit capacityHeat stableness current (kA/2S)0.71.62.5
Dynamic stableness current (kA)1.846.25
Rated frequency (HZ)50~60
Insulation level (KV)Rated voltage (KV)10KV20KV35KV
Power-frequency withstand Voltage (50HZ/1min)42KV55KV95KV
Impulse (1.2/50 μS)75KV125KV250KV
Sealing Performance (KPa/24h)60
Machine life (Thousands of times)2
Request engineering review
Product path 02

Oil-immersed rotatable single-phase tap changers

Review the single-phase rotary interface, required tap positions, and transformer tank-cover arrangement.

Reference drawing

Source dimensional and interface views.

First-party Suvell reference geometry for the single-phase family. The archived source page did not publish a parameter table; confirm all ratings and dimensions with the selected model drawing.

Technical parameter / review itemPublished source scope
Published source familyOil-immersed rotatable single-phase
Published technical parameter tableNot published on the archived source record
Phase arrangementSingle-phase
Tap positions and contact sequenceCustomizable
Mounting arrangement and clearancesCustomizable
Project drawing and installation evidenceRequired for release
Request engineering review
Product path 03

Oil-immersed rotatable three-phase tap changers

Review the transformer interface, phase arrangement, and off-circuit rotary adjustment requirement for the project.

Reference drawing

Source dimensional and interface views.

First-party Suvell reference geometry for the three-phase family. Confirm the final model, connection sequence, and dimensions against the project drawing before release.

Technical parameter / review itemPublished source scope
Published source voltage classes15 / 25 / 35 kV
Published rated current63 / 125 A
Published source familyOil-immersed rotatable three-phase
Model / terminal configurationCustomizable — confirm against project drawing
Tap positions and connection sequenceCustomizable
Project drawing and installation evidenceRequired for release
Request engineering review
Product path 04

Three-phase five-position rotary tap changers

Confirm the three-phase, five-position requirement and the transformer winding connection sequence before selection.

Reference drawing

Source dimensional and interface views.

First-party Suvell reference geometry for the three-phase five-position family. Confirm the selected model, connection sequence, and all project dimensions before release.

Technical parameter / review itemPublished source scope
Published tap settings+5% / +2.5% / 0 / −2.5% / −5%
Published source voltage options10 / 20 / 35 kV
Published source family3P five-position oil-immersed rotary
Phase arrangementThree-phase
Rotary operating handle and tank-cover interfaceCustomizable
Project drawing and installation evidenceRequired for release
Request engineering review
Project handoff · before release

Confirm the tap changerproject inputs.

After selecting a product path, align the off-circuit operating requirement, transformer interface, installation arrangement, and release evidence before quotation. Model-specific values and dimensions remain confirmed against the selected record and project drawing.

Factory forming process support image
Manufacturing processSource factory support image
Factory evidence
Factory process station support image
Process stationSource factory support image
Factory evidence
Oil-immersed rotatable three-phase tap changer reference drawing view 1
Published reference drawingThree-phase rotary family geometry
Path 03
Release evidencePreparation, inspection, and delivery reference.

Use project-specific inspection, packing, and shipment requirements when the selected configuration is released.

Factory production line support image
Production line
Factory preparation and packing area
Preparation / packing
Factory inspection and assembly area
Inspection / assembly

Bring the correct engineering inputs into one review.

Off-circuit regulation requirement

Confirm the operating condition, phase arrangement, required tap positions, voltage regulation range, and selected product path before releasing a model for review.

Transformer and installation interface

Provide the tank-cover mounting arrangement, handle orientation, terminal or lead layout, operating clearance, and available transformer drawing or interface photos.

Evidence package

Include the selected product record, applicable source drawing where published, transformer documentation, required inspection evidence, quantity, destination, and requested delivery timing.

OEM / ODM coordination

Confirm product path, phase arrangement, connection sequence, marking, installation interface, and project-specific adjustments before manufacture.

Quality-control evidence

Define the required inspection, traceability, test evidence, and documentation expectations for the confirmed configuration.

Packing and delivery

State quantity, destination, packing basis, logistics constraints, and requested delivery date before the project is released.

Factory and delivery workflow

From confirmed recordto delivery.

A selected tap changer path moves through six connected handoffs. Final production conditions, inspection records, packing method, and dispatch timing remain confirmed against the project record.

  1. 01

    Technical confirmation

    Confirm the product path, phase arrangement, selected record, transformer interface, and release inputs.

  2. 02

    Project procurement

    Confirm the source record and supply basis required for the approved configuration.

  3. 03

    Production planning

    Align quantity, marking, configuration details, inspection needs, and requested delivery window.

  4. 04

    Assembly coordination

    Prepare the selected tap changer arrangement against the confirmed project release conditions.

  5. 05

    Inspection and packing

    Confirm required inspection evidence, protective packing, identification, and shipping documents.

  6. 06

    Dispatch and delivery

    Confirm destination, logistics method, consignee details, and planned dispatch timing.

Start project review
Configuration FAQ

Off-load tapchanger FAQ

Use these answers to distinguish the source-backed information in each product Modal from the electrical, mechanical, and documentation inputs that require transformer and project confirmation.

What information is needed to select an off-load tap changer?

Start with the transformer application, selected product path where known, phase arrangement, required tap positions, current and voltage duty, tank-cover or mounting interface, connection sequence, quantity, and available transformer drawing or photos.

Which technical values can be reviewed from this page?

The product Modal keeps source-backed parameter information tied to the matching product path. The linear product shows its published WST 30, WST 63, and WST 125 table; final suitability still requires transformer and project confirmation.

Does every tap changer product include an engineering drawing?

No. Drawing previews are included only where matching published drawing material is available for that product path. The off-load linear tap changer is shown with technical parameters only, without a substituted or unrelated image.

Which details remain project-specific before quotation?

Terminal layout, connection sequence, tank-cover mounting, operating handle orientation, dimensions, marking, inspection evidence, packing basis, quantity, destination, and delivery timing should be confirmed against the transformer drawing and inquiry record.

What should an OEM or ODM tap changer inquiry include?

Include the selected product path if known, transformer application, phase and tap-position requirement, interface or drawings, quality-document expectations, quantity, destination, and requested delivery arrangement.

Project review request

Build a tap changerreview package.

Send the transformer interface and available project evidence so the review starts with the correct product path, rather than an assumed model or unmatched drawing.

Useful project inputs
Transformer application and selected product pathPhase arrangement, tap positions, and electrical dutyTank-cover mounting, interface, drawings, or photosConnection sequence, terminal layout, and operating-handle directionInspection, traceability, packing, and document expectationsQuantity, destination, logistics basis, and requested delivery timing
Send project inquiry

Request a tap changer review

Tell us the transformer application, selected product path, phase and tap-position requirement, mounting arrangement, quantity, and available project documentation.

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