Scope
This standard specifies the terms and definitions, structural types, product models, product specifications and installation dimensions, technical requirements, test items and requirements, marking, packaging, transportation, storage, and factory documents of pressure relief valves This standard applies to pressure relief valves (hereinafter referred to as relief valves) installed on oil immersed transformers (including transformers, reactors, tap changers, etc.) The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document GB/T 191 Packaging, Storage, and Transportation Pictorial Symbols
GB/T531.1 Vulcanized or Thermoplastic Rubber, indentation hardness test method Part 1: Shore hardness tester method (Shore hardness)
GB/T 531.2 Vulcanized or thermoplastic rubber, indentation hardness test method, Part 2: Portable rubber international hardness tester method
GB 1094.1 Power Transformers Part 1: General
GB/T 1690 Vulcanized or thermoplastic rubber, liquid resistance test method
GB/T 2423.4 Environmental testing for electrical and electronic products Part 2: Test methods, Test Db: Alternating damp heat (12h+12h cycle)
GB/T 2423.16 Environmental Testing for Electrical and Electronic Products - Part 2: Test Methods, Test J and Guidelines: Mold Growth
GB/T 2423.17 Environmental Testing for Electrical and Electronic Products - Part 2: Test Methods, Test Ka: Salt Mist
GB/T 2900.95 Electrotechnical Terminology - Transformers Voltage regulators and reactors
GB 4208 Degrees of Protection Provided by Enclosures (IP Code)
JB/T 3837 Method for Model Selection of Transformer Products
JB/T8448.1 Technical Conditions for Sealing Products Used in Transformer Products, Part 1: Rubber Sealing Products
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