GB/T 33588.7-2020 in English
VALIDLightning protection system components(LPSC)—Part 7:Requirements for earthing enhancing compounds
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | GB/T 33588.7-2020 |
| Document status: | VALID |
| Title in English: | Lightning protection system components(LPSC)—Part 7:Requirements for earthing enhancing compounds |
| Title in Chinese: | 雷电防护系统部件（LPSC）第7部分：接地降阻材料的要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| Superseding: |
GB/T 33588.7-2017 Lightning protection system components(LPSC)―Part 7:Requirements for low resistivity mixture for earthing
|
| ICS Classification: | 91.120.40-Lightning protection |
| Chinese Classification: | K10-Electrotechnical material and universal parts in general |
| Professional Classification: | GB-National Standard |
| Related Topics: | lightning protection
Lightning Protection System Components lightning system lightning protection system Systems GB/T 33588.7 GB/T 33588.7-2017 GB/T 33588.7-2020 Position Lightning Protection |
《GB/T 33588.7-2020雷电防护系统部件（LPSC）第7部分：接地降阻材料的要求》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
Background of Standard Revision and Technological Evolution
GB/T 33588.7-2020, as Part 7 of the Lightning Protection System Components (LPSC) series of standards, replaces the 2017 version of the standard. The main technical changes include:
- Added a new step for measuring the resistivity of powder materials (Clause 5.3.3)
- Improved the specification requirements for grounding electrodes for corrosion tests (Clause 5.9.1)
- Deleted the corrosion test items for buried materials
- Added normative Appendix A type test process
Core performance indicator requirements
| Indicator items | Technical requirements | Test methods |
|---|---|---|
| Resistivity | ≤5Ω·m at room temperature (20±5)℃ | Four-electrode method (Clause 5.3) |
| Stability | Resistivity change rate≤20% | Water loss + hot and cold cycle + water immersion test (Clause 5.4) |
| Corrosion rate | Steel grounding body≤0.03mm/a | 120-day accelerated corrosion test (Clause 5.9) |
Analysis of key test methods
Resistivity measurement system
A four-electrode box (size 0.5m×0.1m×0.1mm) is used with an AC power supply (50Hz) for measurement. A pressure of 100N/m² is applied to the powder material for 1 hour. Calculation formula:
ρ=(R·A)/a, where A is the cross-sectional area and a is the electrode spacing
High current withstand test
- Impulse current: 8/20μs waveform, 6kA peak, 10 impulses
- Power frequency current: 30A effective value, 10s duration, 5 cycles
Project implementation suggestions
- Radioactivity (Ira≤1.0) and heavy metal indicators must be verified when selecting materials
- Material should be in close contact with the grounding body during construction
- Resistivity changes should be checked regularly, and replacement is required if it exceeds 20% of the initial value
- Corrosion effects of different types of grounding bodies (round steel/flat steel) should be evaluated separately
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