Description
Description of FZ(R)N25-1 Series Indoor High-Voltage Vacuum Load Switch
The FZ(R)N25-1 Series Indoor High-Voltage Vacuum Load Switch, including its fuse combination electrical apparatus variant, is a high-reliability indoor electrical device specifically developed for three-phase AC 50Hz power systems with a rated voltage of 12KV. It integrates advanced vacuum arc-extinguishing technology, designed to serve as a core control and protection component in various indoor power distribution scenarios, delivering stable performance and flexible operation.
This series covers two main models: the FZN25-12D/630-20 vacuum load switch and the FZRN25-12D/T200-31.5 vacuum load switch-fuse combination apparatus. The standard load switch is capable of switching load currents, closed-loop currents, no-load transformers, and cable charging currents, while the combination variant adds enhanced short-circuit protection functionality, making it more reliable and cost-effective than traditional circuit breakers for specific equipment protection.
Equipped with both manual and motor-operated mechanisms, the FZ(R)N25-1 Series facilitates the three remote control requirements (remote control, remote signaling, remote measurement) of modern power systems, improving operational efficiency and reducing on-site maintenance workload. Its compact indoor design ensures easy installation and space-saving, adapting to the layout needs of various power distribution facilities.
Parameter of FZ(R)N25-1 Series Indoor High-Voltage Vacuum Load Switch
| number | project | unit | parameter | ||
| FZN25-12D/T630-20 FZRN25-12D/T125-31.5 | FZRN25-12D/T125-31.5 | ||||
| 1 | rated voltage | kV | 12 | ||
| 2 | rated frequency | Hz | 50 | ||
| 3 | rated current | A | 630 | 125 | |
| 4 | rated insulation horizontal | 1 min power frequency withstand voltage (effective value) | kV | arc quenching break 30 | |
| Ground and phase 42; Isolation break 48 | |||||
| lightning impulse withstand voltage (peak) | kV | 75 for interbedded strata; 85 for isolated faults | |||
| 5 | rated dynamic stability current (peak) | kA | 50 | – | |
| 6 | 4S thermal stability current | kA | 20 | – | |
| 7 | rated active load breaking current | A | 630 | 125 | |
| 8 | rated closed circuit breaking current | A | 630 | 125 | |
| 9 | rated cable charging breaking current | A | 10 | 10 | |
| 10 | rated open-circuit capacity of the no-load transformer | KVA | 1600 | 1600 | |
| 11 | rated breaking current | kA | – | 31.5 | |
| 12 | rated transfer current | A | – | 2000 | |
| 13 | Fuse model | – | SDLAJ-12,SFLAJ-12 | ||
| 14 | impactor output energy | J | – | 2-5 (Medium) | |
| 15 | rated short-circuit closing current | kA | 50 | ||
| 16 | Rated dynamic stability current (peak) of the grounding switch | kA | 50 | ||
| 17 | 2S thermal stability of the grounding switch | kA | 20 | ||
| 18 | rated voltage of the auxiliary circuit | V | AC DC220 AC Dc110 | ||
| 19 | mechanical life | time | 10000 | ||
Feature of FZ(R)N25-1 Series Indoor High-Voltage Vacuum Load Switch
- Dual Operation Mechanism: Integrated manual and motor-operated mechanisms, enabling flexible on-site operation and remote control, perfectly meeting the three remote control requirements of modern power systems and improving operational efficiency.
- Reliable Vacuum Arc-Extinguishing: Adopting mature vacuum arc-extinguishing technology, it features fast arc extinction, low contact wear, and long service life, ensuring stable breaking performance even under frequent operation conditions.
- Enhanced Protection Performance (Combination Variant): The FZRN25-12D/T200-31.5 model is equipped with a dedicated fuse and earthing switch, providing more reliable short-circuit protection than traditional circuit breakers and capable of withstanding short-circuit currents to protect key equipment.
- Cost-Effective & Practical: Compared with circuit breakers, the fuse combination variant offers higher cost-effectiveness in transformer protection scenarios, reducing initial investment and later maintenance costs while ensuring protection reliability.
- Compact Indoor Design: Small volume and lightweight structure, suitable for indoor installation in power distribution rooms and box-type substations, saving installation space and simplifying on-site layout.
- Wide Adaptability: Compatible with various indoor power distribution scenarios, including ring networks, terminal power supplies, and dual-radiation power supply units, with stable performance under different load conditions.
- Easy Maintenance: Adopting high-quality components and a sealed structure, it has good anti-dust and anti-humidity performance, reducing later maintenance workload and ensuring long-term stable operation.
