GB/T 35706-2017 in English

VALID

Technical rule for ice mapping of power grid

Issued on:2017-12-29
Implemented on:2018-07-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $360.00
$350.00

Standard No:	GB/T 35706-2017
Document status:	VALID
Title in English:	Technical rule for ice mapping of power grid
Title in Chinese:	电网冰区分布图绘制技术导则
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2017-12-29
Implemented on:	2018-07-01
ICS Classification:	29.240.99-Other equipment related to power transmission and distribution networks
Chinese Classification:	F23-Power plant and electric power system operating maintenance
Professional Classification:	GB-National Standard
Related Keywords:	ice mapping ice zone ice disaster key verification threshold ice thickness calculation system ice weight
Related Topics:	power grid Distribution spectral distribution diagram draw Technical guidelines for drawing ice area distribution map of power grid time ice Distribution area Distribution map Broad Spectrum Distribution Map Interval distribution Distribution GBT35706 GB/T 35706-2017 Technical guidelines for drawing wind area distribution map of power grid Regional distribution map of grid pollution of State Grid Corporation of China The difference between hydrogen conductivity and specific conductance origindraw cloud map origin draw cloud map Zonghai chart drawing technology

《GB/T 35706-2017电网冰区分布图绘制技术导则》由TC202（全国架空线路标准化技术委员会）归口，TC202SC1（全国架空线路标准化技术委员会线路运行分会）执行，主管部门为中国电力企业联合会。

Introduction

Analysis of the standard technical framework

Core elements	Technical requirements	Implementation points
Scope of application	110(66)kV and above AC and DC power grids	35kV and below can be implemented as a reference
Basic data	Meteorological observation data for more than 12 years	Must include parameters such as temperature/humidity/wind speed during the icing period
Ice area classification	Light/medium/severe 3 categories 7 levels	20mm is the key verification threshold

Ice thickness calculation system

1. Equivalent ice thickness conversion

Using density 0.9g/cm³ as the benchmark, through wire radius (r), ice weight (G) and other parameters to calculate:

Basic formula: b₀=√(G/0.9πL + r²) - r

2. Nominal thickness correction

Coordinate system: National 2000 or WGS84
Drawing specification: No. 0 drawing (default)
Color scale specification: RGB mode graded filling

2. Microtopography correction coefficient

Height correction factor

K_h=(Z/Z₀)^β

Terrain type	Correction coefficient
Pass	2.0-3.5
Windward slope	1.2-2.0
Leewind slope	0.5-0.8

Implementation suggestions

1. Data quality control

It is recommended to establish a three-level verification mechanism:
① Logical verification of original data
② Rationality analysis of calculation results
③ On-site ice condition review

2. Technology evolution direction

Develop LiDAR 3D scanning technology to supplement traditional observation
Integrate numerical weather forecast models to improve prediction accuracy
Establish a dynamic ice zone database for real-time updates

Typical application cases

Revision of ice zones in Hunan Power Grid in 2018:
By applying this standard, it was found that the original 20mm ice zone in Xiangxi should actually be divided into 30mm levels. After adjusting the line design standards accordingly, the accident of 7 tower collapses was avoided in the 2021 ice disaster.

More samples: GB 50021-2001(2009) JGJ 94-2008 DL/T 368-2010

Sample only — not a preview of GB/T 35706-2017

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