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NSRM-20
NSRM-20 SF6 gas-insulated ring main unit
This 20KV SF6 charging cabinet is a mainstream product in the medium voltage distribution field, representing efficient and reliable distribution technology. It completely seals all high-voltage live parts in a stainless steel gas box filled with SF6 gas, achieving “full insulation, full sealing, and maintenance free”. The product adopts a modular design concept and flexible combination methods, which can meet the simple needs of end users and also handle the complex configuration of network nodes. It is the core equipment for building a modern intelligent distribution network.
Features
1. Mainstream preference:
20KV is the standard voltage for many medium voltage distribution networks in various regions. This product has mature technology and stable performance, making it the preferred solution for power grid construction and renovation.
2. Balanced performance:
Achieving a perfect balance between insulation strength, breaking capacity, equipment volume, and manufacturing cost, with extremely high cost-effectiveness.
3. Intelligent integration:
Reserve intelligent interfaces that can easily integrate comprehensive digital relays, FTU/RTU and other automation equipment, laying a solid foundation for building an intelligent distribution network.
4. Arbitrary combination:
Provides multiple functional modules such as C (load switch), F (load switch fuse combination), V (circuit breaker), etc., which can be arranged and combined as needed for easy expansion.
5. Safety relief:
The unique safety relief channel design ensures directional release of high-pressure gas even in extreme fault situations, ensuring personnel safety.
As the mainstream solution for medium voltage distribution, all parameters of this 20KV gas filling cabinet comply with international and national standards. The rated voltage is 20KV, and the power frequency withstand voltage and lightning impulse withstand voltage reach ≥ 50KV and ≥ 125KV, respectively, with excellent insulation performance. Its rated short-time withstand current is 20kA or 25kA, and its peak withstand current can reach 50kA to 63kA, with strong short-circuit resistance. At the same time, it can disconnect 135A cable charging current and support a maximum busbar specification of 400mm ². The product is manufactured strictly in accordance with standards such as GB3906 and IEC60298, ensuring its universality and interchangeability worldwide.
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Specification
| Item | Unit | Model C | Model F | Model V | Model CB |
| Rated voltage | kV | 20 | 20 | 20 | 20 |
| 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
What are the common configurations of 20KV gas filling cabinets?
It mainly includes incoming cabinets, outgoing cabinets, contact cabinets, metering cabinets, etc., which can be flexibly combined through modules such as C, F, V, etc.
What is the difference between load switch and circuit breaker?
The load switch is used for opening and closing normal current, and has isolation function; Circuit breakers (V modules) are capable of breaking short-circuit fault currents, providing stronger protection functions.
How to monitor internal gas pressure?
In addition to the built-in density monitoring device, an SF6 gas leak detector can be used for on-site testing. The equipment has undergone rigorous airtightness testing before leaving the factory to ensure that the leakage rate meets the standards, and there is no need for frequent leak detection in daily life.
Does it support electric operation?
All switch units can be equipped with electric operating mechanisms to achieve remote opening and closing control, meeting the needs of unmanned substations.
What should be noted during installation?
Mainly pay attention to lifting safety, check whether the air box is damaged, and ensure that the cable connection is correct and firm.
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.
