Technical requirements and test methods for surge protectors for information and communications purposes Part 5: Onboard AC surge protectors
1Key Takeaways
This document is applicable to the quality evaluation and inspection of onboard surge protectors connected to AC rated voltage 380/220 V (effective value), 50 Hz circuits. For onboard surge protectors with other AC rated voltage levels, please refer to this document. implement. This document does not apply to discrete …
2Expert Interpretation
In-depth interpretation of the technical requirements for onboard AC surge protectors in the YD/T standard, covering classification standards, lightning protection performance indicators, electrical safety test methods and environmental adaptability requirements, suitable for SPD selection and quality evaluation of 380/220V communication equipment.
Analysis of the core content of the standard
| Technical dimension | Voltage-limiting SPD | Switch type SPD | Combination type SPD |
|---|---|---|---|
| Test current waveform | 8/20μs | Mixed wave | Compound waveform |
| Action load test | Class II test | Class III test | Dual test |
| Voltage protection level | ≤Declared Up value | ≤Declared Up value | ≤declared Up value |
Key technical requirements
The standard clearly states that the board-mounted AC surge protector must meet the following requirements:
- Microclimate adaptability: maximum operating temperature of 125℃ (grading test)
- Lightning protection performance: the residual voltage value under 8/20μs waveform does not exceed the value declared by the manufacturer
- Electrical safety: insulation resistance ≥5MΩ (between live parts and housing)
Key points of the test method
Typical test process includes:
- Pretreatment: 60 minutes of live aging under microclimate conditions
- Limiting voltage test: using 1.2/50μs impulse voltage waveform
- Action load verification: 15 times 8/20μs impulse current (Type II test)
Implementation suggestions
Note in actual application:
- Air pressure correction factor should be considered when used below 3000 meters above sea level
- Two-port SPD requires additional voltage drop test (≤2%)
- Regularly verify the disconnector function status of the SPD