Renewable Booster Substation FAT Documents: What to Review Before Witnessing

Release Time: 2026-08-14

Before witnessing a renewable booster substation FAT, the EPC should align the equipment identity, approved drawings, test procedure, inspection and test plan, witness points, calibration records, signatories, and deviation workflow in one controlled index. This article is a document-readiness guide, not a test result or acceptance decision.

JUBANG transformer equipment for FAT document review

Part 1. Establish the FAT document boundary

“FAT” can cover a transformer, MV switchgear, protection and control interfaces, or the complete prefabricated-station scope. Start by naming the equipment boundary and the document revision under review. Do not infer a test scope from a product photograph or a generic product-family page.

Important: A witness invitation is not evidence that a test procedure, approved drawing set, calibration record, and deviation route are complete. Keep those records in the controlled index before the witness date. (IEC 62271-202)

Part 2. Align equipment identity and revisions

The document index should allow every report page to be traced to the equipment being witnessed. Record the asset or serial identity, scope boundary, drawing number and revision, procedure revision, and the party controlling each record.

Identity field	Review input	Owner to confirm
Equipment identity	Nameplate or approved asset record	Supplier / EPC
Scope boundary	Transformer, MV, enclosure and interface matrix	EPC
Drawing revision	Approved GA, schematic and wiring references	Design authority
Procedure revision	FAT procedure and change history	Supplier

Part 3. Map the procedure, ITP, and witness points

The inspection and test plan should point to the procedure section, expected record, and witness or hold point. That mapping keeps the witness conversation on documented scope rather than on an improvised checklist.

JUBANG metal-clad switchgear equipment for FAT witness-point mapping

Record	What to check before witnessing	Do not claim
FAT procedure	Revision, sequence, prerequisites and sign-off fields	A passing result
ITP	Test/inspection reference and witness status	A completed hold point
Calibration record	Instrument identity, validity and traceability	Measurement accuracy beyond the record
Drawing set	Applicable scope and revision	Final as-built acceptance

For broader project inputs, see JUBANG’s PV booster station design inputs. That article is not a FAT result or commissioning method.

Part 4. Assign record owners and witnesses

List who prepares the record, who witnesses, who reviews technical evidence, and who accepts a deviation. The owner, EPC, supplier, and independent witness can have different responsibilities; a signature block should not silently transfer them.

The handoff should identify:

the document controller and current revision;
the supplier contact for procedure and test records;
the owner/EPC witness and approval route;
the party responsible for interface documents; and
the person authorized to accept or reject an open action.

JUBANG’s BESS booster substation protection interfaces is a related interface topic, not evidence of a FAT configuration.

Part 5. Control deviations and open actions

Record each deviation with a unique reference, affected document, factual observation, owner, due date, and disposition route. Keep “open,” “under review,” and “closed” distinct. A signed attendance sheet does not close an engineering deviation.

Deviation field	Minimum record
Reference	Unique action or NCR number
Evidence	Report page, drawing or observation reference
Responsibility	Named owner and reviewer
Disposition	Approved route, revision, and due date
Closure evidence	Updated record or acceptance note

This process records project decisions; it does not create a pass/fail conclusion or certify the equipment.

Part 6. Assemble the FAT RFQ document pack

Send one controlled revision register with the quotation or FAT request. Ask the supplier to identify missing inputs and deviations rather than silently applying defaults.

FAT/RFQ input	Buyer should provide	Why it is needed
Scope basis	One-line diagram, scope matrix and revision	Defines what is witnessed
Identity records	Asset/serial list and nameplate references	Links records to equipment
Procedure basis	Approved FAT procedure and ITP	Defines witness points
Drawing set	GA, schematic and interface drawings	Supports traceability
Quality records	Calibration and document-control requirements	Makes evidence reviewable
Action control	Deviation log template and approval path	Prevents silent closure

Part 7. Hand the controlled pack to a product enquiry

Once the scope matrix, document index, and open-action process are approved, the EPC can discuss the project with the JUBANG prefabricated substation range.

JUBANG dry-type transformer product context for a controlled FAT enquiry

The public product page does not prove a FAT procedure, test value, certification, compliance, or acceptance. Send the controlled pack through JUBANG Contact Us for project-specific review.

FAQs

What documents are needed before a FAT?

Use a controlled index containing the approved scope, drawings, FAT procedure, ITP, witness points, calibration records, signatories, and deviation route.

What is checked during a transformer FAT?

The approved project procedure defines the checks. This article explains how to review that procedure and its records; it does not publish test values or results.

Who signs FAT documents?

The project should name the preparer, supplier reviewer, owner/EPC witness, and approval authority in the document-control plan.

What happens when a FAT deviation is found?

Give it a unique reference, record objective evidence, assign an owner, and route the disposition through the approved project change or quality process.

Can a signed FAT attendance sheet close a deviation?

No. Attendance records show participation; closure requires the documented disposition and the responsible approval evidence.

Should an EPC request the FAT pack with a quotation?

Yes. Provide the scope, identity, procedure, ITP, drawings, quality-record requirements, and action-control template so the supplier can identify gaps before witnessing.