Direct Recommendation
A three-phase distribution transformer specification should state capacity, HV/LV ratio, frequency, vector group, impedance, tapping, cooling, losses, insulation, site conditions, terminals, accessories, protection interfaces, tests, and document requirements.
For industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, the useful deliverable is not another broad definition. It is a marked specification, a deviation list, and enough project information for a supplier to identify the correct equipment family. Start from Oil-Immersed Transformers and Dry-Type Transformers; those pages define the current public Jinxing product scope.
Decision Summary
- Buyer intent: Specification checklist.
- Project context: industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution.
- First evidence to prepare: the approved single-line diagram plus the equipment data sheet, load schedule, or feeder schedule that applies to this request.
- Expected supplier response: a model-family match, marked technical exceptions, applicable evidence, missing inputs, and a defined quotation boundary.
Product Scope Relevant to three phase distribution transformer
The rows below are limited to products already published on the Jinxing website. Use them to identify the relevant family and voltage class, then verify the actual rating, arrangement, components, tests, and documents against the project specification.
| Jinxing product | Public voltage scope | Typical website application | Use this page to |
|---|---|---|---|
| 10kV Oil-Immersed Transformer | 10kV / 11kV class | Commercial, residential, rural grid, industrial | Check the model family and send project-specific requirements |
| 20kV Oil-Immersed Transformer | 20kV class | Utility distribution and industrial systems | Check the model family and send project-specific requirements |
| 10kV Dry-Type Transformer | 10kV class | Indoor distribution rooms, factories, commercial buildings | Check the model family and send project-specific requirements |
| 20kV Dry-Type Transformer | 20kV class | Industrial distribution, substations, infrastructure | Check the model family and send project-specific requirements |
Quotation-ready specification structure
A useful RFQ defines the system, equipment duty, physical interfaces, verification scope, and commercial boundary in one package. For three phase distribution transformer, the review should produce the following evidence or decision at each stage.
| Review area | Question to close | Evidence or output |
|---|---|---|
| System definition | Single-line diagram, source, load, fault level, earthing, and operating philosophy | Approved electrical design basis |
| Equipment schedule | Ratings, feeder or transformer duties, quantities, spares, and future provision | Data sheet and equipment list |
| Interfaces | Cable, busduct, control, communication, civil, room, enclosure, and environmental constraints | Interface and layout drawings |
| Acceptance and delivery | Standards, tests, documents, inspection, packing, destination, and target date | Document and commercial schedule |
Stop and clarify the offer when any of these red flags appear:
- Requesting a price from only a product name and voltage.
- Missing fault level, feeder schedule, or installation environment.
- Not defining drawings, tests, packing, and delivery boundary.
Six Technical Decisions to Record
These six decisions are selected for the specification checklist behind three phase distribution transformer.
| Decision | Why it changes the offer | Required project input |
|---|---|---|
| Voltage class and ratio | Match the upstream supply, downstream system, insulation coordination, and local utility requirements. | Record the project value or mark it as an open voltage class and ratio clarification |
| Capacity and load profile | Use connected load, demand, motor starting, harmonics, redundancy, and future expansion rather than nameplate totals alone. | Record the project value or mark it as an open capacity and load profile clarification |
| Voltage adjustment | Confirm nominal ratio, operating voltage variation, tapping range, step size, and whether adjustment is de-energized or on-load. | Record the project value or mark it as an open voltage adjustment clarification |
| Cooling and temperature rise | Check heat rejection, ventilation, ambient temperature, loading pattern, and the supplier's declared cooling method. | Record the project value or mark it as an open cooling and temperature rise clarification |
| Loss and lifecycle review | Compare declared loss data only when rating, material scope, test basis, loading profile, and evaluation period are equivalent. | Record the project value or mark it as an open loss and lifecycle review clarification |
| Drawings and test documents | List required GA drawings, single-line diagrams, nameplate data, routine tests, report references, certificates, and shipping documents. | Record the project value or mark it as an open drawings and test documents clarification |
Engineering Review Notes
1. Voltage class and ratio
Match the upstream supply, downstream system, insulation coordination, and local utility requirements. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
2. Capacity and load profile
Use connected load, demand, motor starting, harmonics, redundancy, and future expansion rather than nameplate totals alone. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
3. Voltage adjustment
Confirm nominal ratio, operating voltage variation, tapping range, step size, and whether adjustment is de-energized or on-load. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
4. Cooling and temperature rise
Check heat rejection, ventilation, ambient temperature, loading pattern, and the supplier's declared cooling method. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
5. Loss and lifecycle review
Compare declared loss data only when rating, material scope, test basis, loading profile, and evaluation period are equivalent. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
6. Drawings and test documents
List required GA drawings, single-line diagrams, nameplate data, routine tests, report references, certificates, and shipping documents. In the context of industrial plants, commercial buildings, utility feeders, compact substations, and infrastructure distribution, write this decision into the three phase distribution transformer data sheet and ask the supplier to mark any deviation. The review output should be a value, drawing reference, calculation input, or explicit technical clarification rather than an unrecorded assumption.
Applicable Evidence and Its Limits
The Jinxing website references GB 1094, GB/T 6451, GB/T 10228, IEC 60076 for the relevant product families. These are standards families or project references to discuss. They are not a statement that every rating, arrangement, component, or optional test is automatically covered by the same document.
Public evidence available for early review includes:
For this specification checklist, request a document register that ties each report, certificate, drawing, and routine test to the quoted model or project. Sample evidence supports early qualification; final acceptance records must match the approved configuration and contractual inspection plan.
RFQ Package for three phase distribution transformer
Use this product-specific structure instead of sending only a keyword, catalogue request, or target price.
| RFQ section | Information to provide |
|---|---|
| System | HV/LV voltage, frequency, earthing method, and upstream fault level |
| Transformer duty | kVA or MVA, load profile, vector group, impedance, tapping, and cooling |
| Installation | Indoor or outdoor location, altitude, ambient temperature, enclosure, and terminal arrangement |
| Commercial | Quantity, destination, required documents, inspection points, and delivery target |
Add the project name, inquiry stage, destination country, quantity, local utility or owner rules, trade terms, and delivery target. If information is not yet available, mark it as "to be confirmed" so the quotation can separate assumptions from confirmed requirements.
Related Guide Cluster
Continue with the closest guides in this product cluster:
- Transformer Supplier Quotation Comparison Checklist
- Power Distribution Transformer Selection Guide
- Distribution Transformer vs Power Transformer
Send the Project to Jinxing
Use the Jinxing inquiry form to send the single-line diagram and completed RFQ fields. Ask for the closest Jinxing product match, a list of missing technical inputs, applicable document references, and a quotation that states inclusions and exclusions.
Editorial Scope
Research and drafting were assisted by keyword and generative tools. Product names, routes, public voltage classes, application descriptions, and evidence links were checked against the current Jinxing website data used by this publication workflow. Final engineering, compliance, price, and delivery details require project-specific written confirmation.