This standard specifies the terms and definitions, product classification and models, technical requirements, test items, test methods, markings and packaging, transportation, storage, and factory documents of voltage transformers for control purposes. This standard applies to voltage transformers for control purposes with voltage levels of 6kV and below, and frequencies of 50Hz or 60Hz, as well as voltage transformers for DC control purposes with voltage levels of 10kV and below. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. All dated reference documents, subsequent amendments (excluding corrected content), or revised versions do not apply to this standard. Therefore, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB 311.1 Insulation Coordination of High Voltage Transmission and Transformation Equipment (GB 311.1-1997, neq IEC 60071-1:1993) GB/T 507 Insulation Oil, Determination of Breakdown Voltage (GB/T 507-2002, eqv EC 60156:1995) GB 1207 Voltage Transformers (GB 1207-1997, eqv lEC 60 186:1987) GB 1208 Current Transformers (GB 1208-1997, eqv lEC 60 185:1987) GB/T 2900.15-1997 Electrotechnical Terminology Transformers, Transformers Voltage regulators and reactors (neq IEC 60050-421: 1990, IFC60050-321:1986) JBT 3837 Method for designating transformer type products JBT 9652-1999 Control current transformers JBT 10433-2004 Three phase voltage transformers
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China