GB/T 25308-2022 in English
VALIDDC filters for high voltage direct current (HVDC) transmission system
- Issued on:2022-12-30
- Implemented on:2023-07-01
- File Format:PDF
- Delivery:Within 1 day
$489.00
《GB/T 25308-2022高压直流输电系统直流滤波器》由TC60（全国电力电子系统和设备标准化技术委员会）归口，TC60SC2（全国电力电子系统和设备标准化技术委员会输配电系统电力电子技术分会）执行，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
Main technical changes compared with the 2010 version
| Technical field | 2010 version regulations | 2022 version updates | Impact analysis |
|---|---|---|---|
| Definition of terms | Including 6 terms such as characteristic harmonics | Added 2 terms such as neutral bus capacitor, and deleted 3 terms | Focused more on the definition of equipment entities |
| Use conditions | Altitude ≤1000m | New environmental parameters such as pollution level, earthquake intensity, and wind speed | More stringent requirements on equipment environmental adaptability |
| Equivalent interference current | Calculate all harmonics | Limit 1-50 harmonics, and introduce weighting factors into the formula | Calculation accuracy improved by 20% |
Key design specifications
Filter structure selection guide
- Double-tuned filter: Applicable to 12/24/36 harmonic suppression, high-voltage side capacitor ratio＞60%
- Triple-tuned filter: New requirements on fp1/fp2 parallel resonant frequency control
- Cooperative design principles of smoothing reactor and neutral bus capacitor
Calculation of equivalent interference current
Core formula: Ieq(x)=√[Ie(x)Ⅰ2+Ie(x)Ⅱ2+...+Ie(x)N2]
Where the coupling factor Hf is taken according to the frequency segment (50-2550Hz)
Equipment test requirements
Capacitor test matrix
| Test type | High voltage side | Low voltage side | Special requirements |
|---|---|---|---|
| Routine test | 9 items (including sealing test) | 10 items (adding partial discharge test) | 25℃ reference temperature |
| Type test | 11 items | 9 items | Polarity reversal test is the key |
| Field test | 4 items | 6 items | Insulation resistance ≥500MΩ |
Key tests for reactors
- Temperature rise test: Class B insulation hot spot ≤110℃, harmonic current superposition effect needs to be considered
- Tuning verification: Cold tuning must be performed when the quality factor is ≥10
- Noise test is performed in accordance with GB/T28543-2021
Project implementation suggestions
- Parameter optimization: The high-voltage side capacitance value requires more than 3 rounds of iterative calculation
- Seismic design: Special calculation is required when the earthquake intensity is ＞8 degrees
- Anti-corrosion measures: 316L stainless steel components should be used in coastal areas
- Acceptance focus: Pay attention to the unbalanced current of the filter branch ≤5%
Note: The statistical calculation method of SCCOV of lightning arrester requires ≥10,000 random phase simulations
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