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NSRM-17.5
NSRM-17.5 SF6 gas-insulated ring main unit
NSRM-17.5 is a high-performance medium voltage switchgear designed for specific industrial and special power grid requirements, featuring a 17.5KV SF6 charging cabinet. It inherits the consistent advantages of SF6 gas filling cabinets, encapsulating all live parts with high-strength stainless steel gas boxes to achieve full insulation and sealing. The product not only has a compact structure and flexible operation, but also demonstrates excellent insulation performance and breaking capacity at a voltage level of 17.5KV, which is a solid barrier to ensure the safe and stable operation of the power system.
Features
1. Customized design: Specially optimized for the 17.5KV voltage level to ensure optimal electrical performance and safety margin at that specific voltage.
2. Durable and sturdy: The air box is made of high-quality stainless steel plates that are laser cut and fully automatically welded, with a sturdy structure and strong corrosion resistance, and can adapt to various harsh environments.
3. Flexible Expansion: Adopting advanced modular concepts, unit modules can operate independently or achieve parallel connection of multiple modules through bus expansion, meeting system expansion needs.
4. 24/7 adaptation: IP67 protection ensures that it is completely unaffected by external environmental factors such as condensation, pollution, salt spray, and can even operate normally under extreme conditions such as short-term water immersion.
5. Easy to operate: equipped with a spring energy storage operating mechanism, supporting manual and electric operation, fast and reliable opening and closing actions, and clear position indication.
NSRM 17.5KV gas filling cabinet is a customized product designed to meet specific industrial and power grid standards. Its core parameters have been precisely calculated and verified, with a rated voltage of 17.5KV, a power frequency withstand voltage of ≥ 50KV, and a lightning impulse withstand voltage of ≥ 125KV, fully ensuring insulation margin at this voltage level. The rated current is 630A, with a closed-loop breaking capacity of 630A and a short-circuit closing current of up to 50kA/80kA, providing strong performance. Its mechanical lifespan exceeds 5000 cycles and it can operate stably within the extreme temperature range of -40 ℃ to+70 ℃, demonstrating excellent environmental adaptability and durability.
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Specification
| Item | Unit | Model C | Model F | Model V | Model CB |
| Rated voltage | kV | 17.5 | 17.5 | 17.5 | 17.5 |
| Rated frequency | Hz | 50 | 50 | 50 | 50 |
| Power frequency withstand voltage (phase to phase/port) | kV | 38/45 | 38/45 | 38/45 | 38/45 |
| Lightning impulse withstand voltage | kV | 95/110 | 95/110 | 95/110 | 95/110 |
| Rated current | A | 630 | – | 630/1250 | 630/1250 |
| Rated closed-loop breaking current | A | 630 | 630 | – | – |
| Rated cable charging breaking current | A | 135 | 135 | – | – |
| Rated short-circuit closing current (peak) | A | 50 | 80 | 50 | 50 |
| Rated peak withstand current | A | 50 | – | 50 | 50 |
| Rated short-time withstand current | kA/3s | 20 | – | 20 | 20 |
| Rated short-circuit breaking current | kA | 20 | 31.5 | 20 | 25 |
| Rated transfer current | A | – | 1750 | – | – |
| Maximum current of equipped fuse | A | – | 125 | – | – |
| Circuit resistance | -n | ≤300 | ≤600 | ≤300 | ≤300 |
| Mechanical lifespan | times | 5000 | 5000 | 5000 | 5000 |
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FAQs
What scenarios is the 17.5KV voltage level usually used for?
Commonly seen in specific industrial production lines, mining equipment, or special power grid standards in certain countries/regions.
How to ensure the sealing of SF6 gas?
We use advanced laser welding technology and helium leak detection process to ensure that the annual leakage rate of the gas box is extremely low (≤ 0.25 ‰/year), far superior to national standards.
Does it have explosion-proof function?
Yes, there is an explosion-proof diaphragm at the bottom or rear of the air box, which can release pressure in a directional manner when the internal abnormal pressure is too high, protecting personnel and equipment safety.
Can it be equipped with metering function?
Sure. Configurable dedicated metering module, integrating high-precision current transformers and voltage transformers to meet high-voltage metering needs.
What are the requirements for the installation foundation?
Due to its compact structure and usually installed indoors or in transformer boxes, it does not require high installation foundation, but it needs to ensure levelness and stability.
Related scenario applications
Related Applications
Specific industrial production line: provides power guarantee for large industrial equipment with special voltage requirements.
Mining and excavation: suitable for underground or open-pit power distribution in mines with harsh environments and high requirements for equipment durability.
Special power grid area: meets the upgrading and renovation needs of some substations or switch stations that use non-standard voltage level power grids.
Export project: Matching specific grid voltage standards for certain overseas markets.
