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NSRM-22
NSRM-22 SF6 gas-insulated ring main unit
NSRM-22 is a 22KV SF6 charging cabinet designed for specific markets and high-end applications. It is a medium voltage switchgear that combines advanced technology and excellent performance. It has undergone specialized insulation coordination and structural optimization for the 22KV voltage level, ensuring excellent dielectric performance and breaking reliability at this voltage. The product continues the maintenance free and harsh environment resistant characteristics of the inflatable cabinet, while providing rock solid protection for the power system with exquisite manufacturing technology and reliable interlocking mechanism.
Features
1. Precise adaptation:
specially developed for 22KV voltage level, the electrical clearance and insulation distance have been accurately calculated and verified to ensure foolproof operation.
2. High reliability:
The core switch components are made of high-quality materials and undergo rigorous type testing, possessing extremely high operational reliability and electrical lifespan.
3. Advanced Interlocking:
The mechanical interlocking device is designed with advanced technology and rigorous logic, completely eliminating dangerous operations such as false opening, false closing, and loaded tripping, ensuring equipment and personal safety.
4. Environmentally friendly:
The fully sealed structure effectively prevents SF6 gas leakage and protects internal components from external environmental erosion, making it a truly green and environmentally friendly product.
5. Easy to install:
Adopting a front inlet and outlet design, it can also achieve side outlet according to the site situation. The installation method is flexible and greatly shortens the on-site construction period.
This 22KV gas filling cabinet is a non-standard product developed to meet specific market demands. Its technical parameters have been optimized with targeted measures, with a rated voltage of 22KV, a power frequency withstand voltage of ≥ 50KV, and a lightning impulse withstand voltage of ≥ 125KV, ensuring safety margins at this voltage level. The standard rated current is 630A, which can be extended to 1250A. The closed-loop breaking current is also 630A, and the short-circuit closing current can reach 50kA or 80kA, with strong performance. The IP67 level air box protection and a design lifespan of over 30 years make it a reliable choice for pursuing long-term stable operation at specific voltage levels.
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Specification
| Item | Unit | Model C | Model F | Model V | Model CB |
| Rated voltage | kV | 22 | 22 | 22 | 22 |
| Rated frequency | Hz | 50 | 50 | 50 | 50 |
| Power frequency withstand voltage (phase to phase/port) | kV | 50/60 | 50/60 | 50/60 | 50/60 |
| Lightning impulse withstand voltage | kV | 125/145 | 125/145 | 125/145 | 125/145 |
| 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
Is the voltage level of 2KV common in China?
22KV is not a widely used standard voltage in China, but it may exist in some specific old power grids, specific industrial areas, or export projects.
How to deal with internal arc faults?
The gas box is designed to withstand the pressure generated by internal arc faults and guide the directional release of high-pressure gas through a safety relief channel to protect operators.
Can status monitoring be performed?
Sure. Intelligent components such as partial discharge monitoring and temperature online monitoring can be installed to achieve real-time control of the operation status of the switchgear.
What should be noted during transportation and storage?
It should be kept upright, avoiding severe collisions, and stored in a dry, ventilated indoor environment.
How can after-sales service be guaranteed?
We provide comprehensive technical support and spare parts services to ensure stable operation of equipment throughout its entire lifecycle.
Related Applications
Urban distribution network: widely used in urban ring network power supply systems, serving as ring network cabinets.
Box type substation: As the core switchgear of the high-voltage room, it is integrated into the prefabricated box type substation.
Smart grid node: used for distribution automation nodes that require remote signaling, telemetry, and remote control functions.
Large public facilities: provide stable and reliable power distribution for hospitals, schools, sports venues, etc.
