| Brand | ROCKWILL |
| Model NO. | CSDLA Series Controllable Self-recovering Energy Dissipation Device with Lightning Arrester |
| Rated voltage | 440kV |
| Series | CSDLA Series |
The AC controllable self-recovering energy dissipation device equipped with a lightning arrester. This device utilizes mechanical switches to control the protection characteristics of the lightning arrester, enabling controlled suppression of fault ride-through overvoltage and enhancing the stability of DC systems.
It effectively limits the amplitude of overvoltage within a safe range, protecting subsequent equipment from high voltage damage.
With multiple parallel columns and high current-carrying capacity, it can withstand significant current surges and energy release in a short period, ensuring system stability and safety.
After the intrusion wave disappears, it can automatically restore its insulation capability, featuring multiple impact energy tolerance characteristics, which helps reduce system failure rates and improves the stability and reliability of power systems.
Adopting a compact structure design, it minimizes floor space occupation, facilitating installation and enhancing system integration and operational efficiency.
| Item | Parameter |
|---|---|
| Rated voltage (kV) | 440 (typical, customizable) |
| Continuous operating voltage (kV) | 229 (before action) |
| DC reference voltage (kV) | ≥ 445 |
| Energy absorption capacity (MJ) | ≥ 240 |
| Controllable ratio | 28% |
| Switching impulse residual voltage (kVp) | ≤ 562.9 |
| Lightning impulse residual voltage (kVp) | ≤ 680.9 |
| Rated power frequency withstand voltage (kVrms, to earth) | 580 |
| Rated switching impulse withstand voltage (kVpeak, to earth) | 1,175 |
| Rated lightning impulse withstand voltage (kVpeak, to earth) | 1,550 |
| Number of operations | ≥ 200 times |
| Structure | Multi-column MOV resistor parallel connection (e.g. 88 columns) |
| Current distribution non-uniformity coefficient | ≤ 1.05 |
| Column current sharing coefficient | ≤ 1.05 |
| Application | HVDC transmission system / AC bus transient overvoltage suppression |
| Standard No. | Title |
|---|---|
| GB/T 45648.1-2025 | Technical specification of energy absorption device for HVDC power transmission – Part 1: DC controllable and self-recovery energy absorption device |
| GB/T 45648.2-2025 | Technical specification of energy absorption device for HVDC power transmission – Part 2: AC controllable and self-recovery energy absorption device |
| IEC 60099-4:2014 | Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c. systems |
| IEC 60099-9:2014 | Surge arresters – Part 9: Metal-oxide surge arresters for HVDC converter stations |
| IEC 60099-5:2018 | Surge arresters – Part 5: Selection and application recommendations |
| IEC 60071-1:2019 | Insulation co-ordination – Part 1: Definitions, principles and rules |
| ISO 9001:2015 | Quality management systems — Requirements |
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