GB/T 34937-2017 in English
VALIDInsulators for overhead lines-Composite suspension and tension insulators for d.c. systems with a nominal voltage greater than 1 500 V-Definitions,test methods and acceptance criteria
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
《GB/T 34937-2017架空线路绝缘子 标称电压高于1500 V直流系统用悬垂和耐张复合绝缘子 定义、试验方法及接收准则》由TC80（全国绝缘子标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for the full life cycle of composite insulators for DC overhead lines, with the focus on:
- Material properties: Stress corrosion threshold of epoxy resin impregnated glass fiber core rod ≥60% of ultimate strength
- Structural design: Minimum thickness tolerance of umbrella cover ±1.0mm, negative deviation of creepage distance is zero
- Environmental adaptability: Mechanical stability verification under temperature cycle of -35℃~+50℃
Comparison of key tests
| Test type | Sample requirements | Core indicators | Judgment criteria |
|---|---|---|---|
| Design test | 3 insulators ≥800mm | MAV≥1.67×SML | 96h load without damage |
| Type test | 4 normal products | 70%SML for 96h | No cracks in penetration test |
| Sampling test | E1+E2 sample group | Salt density 0.03-0.12mg/cm² | Double re-inspection mechanism |
Technical innovation
Compared with the specification for insulators for AC systems, this standard adds the following:
- DC specific test: Negative polarity salt spray tracking test (ripple factor ≤3%)
- Material evaluation system: Quantitative detection of hydrophobic migration time of silicone rubber umbrella sleeve (96h recovery θsa≥95°)
- Mechanical reliability verification: Appendix A defines the damage limit theory and load-time curve
Implementation recommendations
Manufacturers need to pay special attention to:
- The fusion area of the zinc ring of the end assembly is ≥80% (width ≥3mm)
- Test load RTL=(0.5~1.1)×SML for each test
- Total defect area of umbrella cover ≤ 0.2% of surface area
Operation and maintenance unit recommendations:
- Refer to Appendix C for typical parameters for model selection
- Non-standard load conditions require special evaluation (Appendix B)
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