GB/T 18802.12-2014 in English
SUPERSEDEDLow-voltage surge protective devices―Part 12:Surge protective devices connected tolow-voltage power distribution systems―Selection and application principles
- Issued on:2014-06-24
- Implemented on:2015-01-22
- File Format:PDF
- Delivery:Via email within 10 business days
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《GB/T 18802.12-2014低压电涌保护器（SPD） 第12部分：低压配电系统的电涌保护器 选择和使用导则》由TC81（全国避雷器标准化技术委员会）归口，主管部门为中国电器工业协会。
GB 18802的本部分适用于连接到交流50 Hz～60 Hz、电压不超过1 000 V，或直流电压不超过1 500 V的SPD的选择、运行、安装位置和配合原理。
Introduction
Core parameter analysis
| Parameter category | Key indicators | Selection points |
|---|---|---|
| Voltage parameters | Uc, Up, UT | Need to be 10% higher than the maximum continuous working voltage of the system, Up should be 20% lower than the equipment withstand voltage |
| Current parameters | In, Iimp, Imax | Class I test SPDs must meet the 10/350 waveform requirement, while Class II uses 8/20 waveform |
| TOV tolerance | UTOV | TT systems must withstand 1200V/5s, while TN systems must consider √3×U0 |
System adaptation principles
According to Chapter 6 of the standard, SPD installation must comply with the following:
- TN-S systems preferably use 3+1 mode SPDs
- TT system neutral-to-ground protection requires a gap-type SPD
- Class I test SPDs should be installed at the entrance of a building (such as DEHNguard series)
Technology Evolution Analysis
Main upgrades compared to the 2006 version of the standard:
- Six new term definitions (such as multi-purpose SPD, residual current IPE)
- Supplementary TOV test requirements (Appendix E)
- Add short-circuit backup protection clauses (Appendix P)
- Improve risk analysis methods (Appendix H/L)
Implementation Suggestions
Typical application scenario configuration:
| Protection area | SPD type | Up requirements |
|---|---|---|
| Incoming line of distribution cabinet | Class I T1 SPD | ≤2.5kV |
| Equipment room power distribution | Class II T2 SPD | ≤1.5kV |
| Terminal equipment | Class III T3 SPD | ≤0.8kV |
Note: The coordination distance should satisfy the V-shaped curve rule (Clause 6.1.3)
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