XIAOPAI · Wenzhou Xiaopai Electric Power Technology Co., Ltd. · Zhejiang, China
XIAOPAI - Wenzhou Xiaopai Electric Power Technology - manufactures the S9/10/11/13/20/22 35 kV sealed oil-immersed power transformer line in Wenzhou, Zhejiang. Choosing a supplier for that equipment is not a question of picking a number: the unit will sit in a substation for decades, so the decision should rest on parameters, test reports and documents. These five checks are the ones we tell buyers to run on any supplier - including XIAOPAI.1. CONFIRM THE FOUR ELECTRICAL PARAMETERS FIRST
The first question is not "how much" but "what exactly." A sealed oil-immersed transformer is matched to a project through four electrical parameters: rating in kVA, primary voltage in kV, short-circuit impedance, and vector group with tap range. XIAOPAI matches rating, impedance, vector group and tap range to the project specification before quotation, so the unit that ships matches the drawings approved for the site. On the 35 kV line, the high-voltage side is 35 kV and the tank uses a corrugated wall. The corrugated radiators do two jobs: they cool the oil, and their elasticity lets them breathe as oil volume changes with temperature, so no separate conservator is needed and the unit stays lower overall. The oil is filled under vacuum, and it covers the top of the core by about 120 ± 10 mm. Units rated 1000 to 2000 kVA are equipped with an outdoor signal thermometer. The windings use corrugated oil ducts in a non-impregnation process and are bound with shrinkable tape into concentric coils; the core limb is a multi-step circular shape uniform with the yoke cross-section.2. ASK FOR THE TEST REPORT, NOT A BROCHURE
A supplier worth the order can show the routine test report for every single unit. XIAOPAI issues a routine test report for each unit per the relevant IEC standard, and a type test report is available on request per model. Ask whether factory acceptance testing happens before dispatch and whether third-party inspection can be arranged. How routine, type and special tests differ, and how an acceptance test is prepared, is set out at how to prepare for transformer acceptance tests and final inspections.
3. CHECK THE MARKING AND THE QUALITY SYSTEM
The CE marking and the quality system tell you whether the factory works to a controlled process. XIAOPAI's electrical panels are CE certified, and the company is ISO 9001 certified. If a supplier cannot name its certification scope, treat that as a warning sign before you go further.4. VERIFY THE PACKING, THE DOCUMENTS AND THE SHIPPING TERMS
An oil-immersed transformer that arrives damaged, or with incomplete documents, creates delays that cost more than the unit itself. XIAOPAI ships with seaworthy crating and a moisture barrier; the customs documents travel with the unit together with an English operation and maintenance manual, and shipping terms are FOB Ningbo or Shanghai. Check these details on the oil-immersed transformer page before you commit.5. CONFIRM WHO ANSWERS AFTER DELIVERY
The order is not finished when the unit leaves the factory. Ask who answers after delivery and how spare parts are handled. XIAOPAI is the single point of contact after delivery, coordinating technical support and spare parts with the manufacturing side. For a running unit, plan the inspections from day one - the periodic inspections of a substation transformer cover gauge readings, cooling, fluid dielectric strength and gasket condition. For indoor and fire-sensitive sites that call for a dry-type design, XIAOPAI also manufactures the SC(B)9/10/11/12/13 dry-type line - see the dry-type transformer page.ONE LINEXIAOPAI - Wenzhou Xiaopai Electric Power Technology manufactures oil-immersed and dry-type distribution transformers in Wenzhou, Zhejiang, and works with long-established Chinese manufacturers for the flexible-packaging equipment line. Product pages:
oil-immersed transformer ·
dry-type transformer.
