GB/T 33588.3-2020 in English
SUPERSEDEDLightning protection system components(LPSC)—Part 3:Requirements for isolating spark gaps (ISG)
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 33588.3-2020雷电防护系统部件（LPSC）第3部分：隔离放电间隙（ISG）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
Interpretation of the core content of the standard
As the standard for key components of lightning protection systems, GB/T33588.3-2020 puts forward systematic technical requirements for isolation discharge gap (ISG). The main updates of this standard that replaces the 2017 version include:
| Technical dimension | 2017 version | New content in the 2020 version |
|---|---|---|
| Scope of application | Conventional power/telecommunication systems | Added AC/DC railway system rail grounding electrodes |
| Classification system | Lightning current classification only | New installation location classification (indoor/outdoor) |
| Test method | Basic electrical test | Added 6 environmental tests such as UV test and corrosion resistance test |
Key technical requirements
1. Grading system
ISG is divided into five levels: H/N/1L/2L/3L according to its lightning current carrying capacity. For specific parameters, see standard Table 1:
Typical application case: A substation uses H-level ISG (100kA peak current) as the isolation protection between the main grounding grid and the secondary system. After 3 years of operation, it has been verified to meet the design requirements.
2. Electrical performance indicators
- Insulation resistance: ≥500kΩ before and after the test
- Impulse discharge voltage: tested under 1.2/50μs waveform
- Withstand voltage: including power frequency/DC types
Implementation points
1. Test process optimization
The new version of the standard requires the test flow chart in Appendix A to be followed, with special emphasis on:
- Salt spray test (GB/T2423.18) must be completed in the pretreatment stage
- Outdoor ISG must pass 1000 hours xenon lamp aging test
2. Selection suggestions
Select the corresponding category according to the installation environment:
- Indoor type: focus on insulation performance
- Outdoor type: must meet both UV resistance and IP protection requirements
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