GB/T 21697-2022 in English
VALIDInsulation coordination of lightning overvoltage for low-voltage distribution wiring and electronic systems
- Issued on:2022-07-11
- Implemented on:2023-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$310.00
$301.00
$301.00
《GB/T 21697-2022低压配电线路和电子系统中雷电过电压的绝缘配合》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
Key points of the new standard revision
| Elements | 2008 Edition | 2022 Edition | Technological Evolution |
|---|---|---|---|
| Equipment Classification | 2-level withstand voltage division | 3-level rating system | Newly added Class III electronic equipment threshold |
| Insulation Test | 6kV Basic Test | 12kV Multi-scenario Simulation | Introduction of Multi-dimensional Superimposed Stress Judgment |
| Surge protection device | Pulse width and frequency limitation | Compound waveform adaptation technology | Meet the needs of new semiconductor equipment |
Lightning overvoltage typing response strategy
- Direct lightning protection: The tower base grounding resistance should not exceed 10Ω
- Inductive lightning blocking: The cable shielding layer overlap rate must reach 85%
- Deeply buried pipeline layout: It is recommended to be ≥3 meters away from the working surface of the building
Medical building implementation case
A third-level isolation transformer and Class IV SPD combination solution are used in a tertiary hospital in Hainan to achieve induced lightning overcurrent suppression of 34%, BS EN 62305 certification test compliance rate is 91.7%.
Insulation coordination parameter matrix
| Equipment environment | Insulation coefficient K | Noise attenuation | Discharge ranging |
|---|---|---|---|
| Grade A communication environment | 1.3~1.8 | -62dB | ≥5m |
| Railway transportation facilities | 2.0~2.5 | -75dB | ≥8m |
| Petrochemical Zone | 2.3~2.9 | -82dB | ≥12m |
Implementation Suggestions and Technical Route
Low Voltage RPU Measurement and Verification Process:
- Pre-check the line layer crosstalk value, the total harmonic current needs to be ≤3.2%Ir
- Multi-spectrum dual-trigger surge calibration, avoidance period ≤15 seconds
- Execute virtual hardware in the loop procedures
Full life cycle management:
Configure intelligent self-check>Live working monitor, real-time collection of impact residual pressure year-on-year baseline data, the official recommended maintenance cycle is 12~15 months.
Sample only — not a preview of GB/T 21697-2022
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