QX/T 355-2016 in English
VALIDGrade of meteorological risk of wire icing
- Issued on:2016-12-12
- Implemented on:2017-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
| Standard No: | QX/T 355-2016 |
| Document status: | VALID |
| Title in English: | Grade of meteorological risk of wire icing |
| Title in Chinese: | 电线积冰气象风险等级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-12-12 |
| Implemented on: | 2017-05-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | meteorological risk level system
meteorological risk risk level duration similar yunnan-guizhou plateau risk level judgment type area judgment standard typical area rime type area frequency |
| Related Topics: | risk
ice baseline risk volume isotherm risk level premium ice box ice accumulation risk criteria risk level QX risk in english risk level atmospheric voc risk Electrical anti-corrosion grade Fabric windproof rating |
Introduction
Standard Overview
QX/T 355-2016 was proposed by the National Technical Committee for Climate and Climate Change Standardization, drafted by the Heilongjiang Meteorological Bureau, and officially implemented on May 1, 2017. The standard establishes a meteorological risk level system for ice accumulation on power lines, including three types of ice accumulation areas and a four-level risk classification method.
Core Terminology Analysis
| Terms | Definition | Unit of measurement |
|---|---|---|
| Ice accumulation on wires | The phenomenon of rime, rime adhering to or wet snow freezing on wires | mm (standard ice thickness) |
| rime | Milky white ice crystal deposits formed by condensation of water vapor | - |
| rime | Transparent ice layer formed by freezing of supercooled raindrops | - |
Classification of ice accumulation types
Typical application cases: The Northeast region is mostly a rime type area, where rime ice is easily formed under the continuous low temperature and high humidity conditions in winter; while rime ice is common in Central China. For example, the ice disaster in Hunan in 2008 was caused by continuous rime.
| Type area | Judgment standard | Typical area |
|---|---|---|
| Rime type area | Frequency of rime occurrence＞70% | Northeast China and Inner Mongolia |
| Rime type area | Frequency of rime occurrence＞70% | Middle and lower reaches of the Yangtze River |
| Mixed type area | The frequencies of the two are similar | Yunnan-Guizhou Plateau |
Risk level judgment
Based on the dual indicators of duration of meteorological conditions and standard ice thickness:
| Risk level | Duration (days) | Standard ice thickness (mm) |
|---|---|---|
| Level 1 (light) | 1-5 | ≤9 |
| Level 2 (medium) | 6-10 | 10-14 |
| Level 3 (heavy) | 11-15 | 15-19 |
| Level 4 (severe) | ≥16 | ≥20 |
Implementation suggestions
- Regional differentiated prevention and control: Areas with rime should pay attention to continuous low temperature and high humidity weather, while areas with sleet should focus on preventing freezing rain
- Real-time monitoring of ice thickness: The standard ice thickness is calculated using the formula B=W/(πρL(R+B)), where ρ is 0.9g/cm³
- Early warning response mechanism: Risks above Level 3 require the activation of the power line de-icing emergency plan
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