GB/T 37048-2018 in English
VALIDTechnical specification for lightning protection of expressway electromechanical systems
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 37048-2018高速公路机电系统防雷技术规范》由TC258（全国雷电防护标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard systematically stipulates a graded protection system for lightning protection of electromechanical systems on highways, and innovatively proposes a differentiated protection strategy based on the level of thunderstorm days. The main contents include:
Key technologies of lightning protection
1. Classification of thunderstorm days
The whole country is divided into 4 levels, corresponding to different protection requirements:
| Type of minefield | Number of thunderstorm days (d/a) | Typical cities |
|---|---|---|
| Strong minefield | >90 | Haikou (95.3), Guangzhou (75.2) |
| Many minefields | 40-90 | Nanchang (52.9), Fuzhou (49.3) |
| Medium minefield | 25-40 | Beijing (33.3), Harbin (32.3) |
| Less minefield | ≤25 | Urumqi (5.6), Yinchuan (16.4) |
SPD hierarchical configuration scheme
2. Surge protector selection matrix
| Application classification | Test type | Minimum discharge current | Applicable scenarios |
|---|---|---|---|
| Class A | T1(Grade I) | Iimp≥12.5kA | Incoming line cabinet of substation in strong lightning area |
| Class B | T1+T2 | In≥20kA | Distribution box for outdoor equipment in multi-thunder area |
| Class E | D1 | 1kA(10/350μs) | Video signal interface in strong lightning area |
Special attention should be paid to the tunnel electromechanical system: the first distribution box in the tunnel in the strong lightning area needs to be equipped with Class B SPD, and the subsequent boxes can be equipped with Class D.
Implementation points
3. Equipotential connection specifications
- The metal frame of the toll booth must be connected to the grounding grid at multiple points
- The spacing between tunnel grounding trunk lines is ≤200m, and the grounding resistance at the tunnel entrance is ≤4Ω
- The size of the M-type equipotential grid is required to be 600mm×600mm
Technology evolution analysis
The main upgrades of this standard compared with QX/T190-2013:
- Added special requirements for SPD for photovoltaic systems (referenced GB/T18802.31)
- Detailed illustration of the application of LPZ zoning in highway scenarios
- Supplemented the measured data of the impulse voltage resistance of electronic equipment
Detection and maintenance requirements
| Project | Cycle | Key Indicators |
|---|---|---|
| Grounding Resistance | Annual Inspection | ≤10Ω(Impact) |
| SPD Status | After Lightning Strike | Leakage Current＜1mA |
| Connection Continuity | Annual Inspection | Resistance＜0.2Ω |
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