GB/T 39437-2020 in English
VALIDTechnical specification for lightning protection of water supply and drainage system
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
| Standard No: | GB/T 39437-2020 |
| Document status: | VALID |
| Title in English: | Technical specification for lightning protection of water supply and drainage system |
| Title in Chinese: | 供排水系统防雷技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| Professional Classification: | GB-National Standard |
| Related Keywords: | water supply
protection high voltage system protection must comply rebuilt water supply distribution system rotating motor protection water purification plants |
| Related Topics: | water system
thunder drainage system Ray+ lightning protection drainage system water system Power distribution system lightning protection GBT39437 GB/T 39437-2020 Lightning Protection Technology of Communication Engineering Power System Water supply and drainage technology |
《GB/T 39437-2020供排水系统防雷技术规范》由416（中国气象局）归口，TC345（全国气象防灾减灾标准化技术委员会）执行，主管部门为中国气象局。
Introduction
Analysis of the core content of the standard
1. Scope of application and basic requirements
This standard applies to all types of newly built, expanded and rebuilt water supply and drainage systems, including:
- water purification plants, wastewater treatment plants buildings and facilities
- Lightning protection for pumping stations and pipe network systems
- Supporting power supply and distribution, and automation control systems
| Lightning protection categories | Classification conditions | Examples |
|---|---|---|
| Category 2 | Class I/II water plants with an estimated lightning strike frequency of >0.05 times/year | Main water plants in large cities |
| Category 3 | Other water supply and drainage buildings | Small sewage treatment plants |
2. Key technical points of protection
High voltage system protection
Must comply with the requirements of GB/T50064-2014, and the arrester selection should meet the following requirements:
- Metal oxide arresters are used in the distribution system
- Rotating motor protection needs to consider steep wave impact
SPD hierarchical configuration
| Installation location | SPD type | Typical parameters |
|---|---|---|
| Main distribution box (LPZ0/1) | T1 category | Iimp≥12.5kA(Class II) |
| Distribution box (LPZ1/2) | T2 category | In≥10kA |
| Equipment terminal | T3 category | Uc≥1.15U0 |
3. Protection requirements for special places
Biogas system
- When the tank wall thickness is ≥4mm, the lightning arrester can be omitted
- Flange jumper resistance ≤ 0.03Ω
- Must use explosion-proof SPD
Automation instrument protection
Equipment such as electromagnetic flowmeters must take the following measures
- Double-end grounding of the metal casing
- Install Class D1 SPD on the signal line
- Use photoelectric isolator (withstand voltage ≥ 10kV)
4. Inspection and maintenance specifications
| Inspection items | Period | Based on standards |
|---|---|---|
| Ground resistance test | Yearly | GB/T21431 |
| SPD status check | Before the thunderstorm season | GB/T18802.12 |
| Hazardous chemicals area inspection | Every six months | Article 9.2 |
Note: A lightning protection safety emergency plan should be established, and a disaster analysis should be conducted after a lightning strike.
Technology evolution analysis
Main improvements of this standard compared to the old version:
- Added Industrial control system room protection requirements
- Detailed SPD installation specifications in TN-S system
- Introduced advanced technologies such as Kevin wiring method
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