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NSRM-3.3
NSRM-3.3 SF6 gas-insulated ring main unit
NSRM-3.3 gas insulated enclosed metal switchgear is designed specifically for 3.3kV low-voltage distribution network scenarios and is the core equipment for rural power grid upgrading, small industrial and mining enterprises, and distributed photovoltaic grid connection. It has become the preferred solution for solving power supply stability in remote areas due to its high cost-effectiveness and strong environmental adaptability. The equipment adopts lightweight modular design and supports “plug and play” combination, which can quickly adapt to different distribution topologies such as single station area and multiple branches, especially suitable for rural station area renovation, small and micro enterprise workshop power distribution and other scenarios, effectively reducing initial investment and operation and maintenance costs.
Features
1. 3.3kV exclusive customization, precise adaptation
2. Fully enclosed gas insulation, fearless of harsh environments
3. Modular “plug and play”, extremely flexible
4. Excellent cost-effectiveness, lower TCO
Protection level: For example, IP67 (air box)/IP4X (housing).
Standard compliance: Complies with relevant IEC or GB standards
The NSRM-3.3 inflatable sulfur hexafluoride fully insulated ring main unit produced by our company has passed rigorous environmental tests such as wet heat and salt spray by the National High Voltage Electrical Testing Center. The sealing structure has been optimized specifically for dusty and high humidity working conditions in rural areas. There are no exposed live parts inside the equipment, completely avoiding common faults such as small animal invasion and condensation flashover, achieving true maintenance free operation. For the scenario of distributed photovoltaic grid connection, the device has built-in anti islanding protection logic, which can seamlessly link with the inverter to ensure the safe integration of new energy. At the same time, it supports flexible configuration of “one cabinet with multiple branches”, which can be expanded to up to 8 outgoing lines, meeting the dispersed power supply needs of multiple users in rural areas and significantly reducing the footprint and construction period of distribution network construction.
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Specification
| Item | Unit | Model C | Model F | Model V | Model CB |
| Rated voltage | kV | 3.3 | 3.3 | 3.3 | 3.3 |
| Rated frequency | Hz | 50 | 50 | 50 | 50 |
| Power frequency withstand voltage (phase to phase/port) | kV | 10/12 | 10/12 | 10/12 | 10/12 |
| Lightning impulse withstand voltage | kV | 20/23 | 20/23 | 20/23 | 20/23 |
| 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 NSRM-3.3 specifically designed for the 3.3kV voltage level?
Yes, NSRM-3.3 is specifically designed for 3.3kV low-voltage distribution network scenarios, with optimized electrical parameters and structure for this voltage level.
Can the device adapt to harsh environments with high dust and humidity?
Yes, it adopts a gas insulated enclosed metal shell, which can effectively isolate dust and moisture, and can operate stably even in harsh environments.
How does the "plug and play" modular design of NSRM-3.3 help with construction?
This design can significantly shorten the construction period, lower the installation threshold, and flexibly adapt to different distribution layouts, making later expansion more convenient.
Is it troublesome to maintain the equipment installed in remote areas in the later stage?
No trouble, low equipment failure rate, modular design allows for quick replacement of faulty modules, and only simple daily inspections are needed.
What distribution network topologies does NSRM-3.3 support?
It supports single zone and multi branch distribution topologies, and some configurations can also achieve small ring networks, adapting to various scene requirements.
Related Applications
Upgrading rural power grids and renovating remote areas
Resolve the issue of “low voltage” caused by excessively long power supply radius in rural distribution networks. Used for upgrading and renovating rural end of pipe power grids, replacing traditional old switchgear, and solving the problems of long power supply radius, high line loss, and unstable voltage in remote mountainous areas.
Distributed photovoltaic grid connection and new energy access
Widely used in distributed photovoltaic power plants, industrial and commercial rooftop photovoltaic boost and grid connection systems, as a key protection node between inverters and the power grid. Modular design supports rapid deployment (plug and play), and the compact size can be easily integrated into box type substations (European/American substations), saving floor space.
Small industrial and mining enterprises and high dust workshops
Suitable for industrial environments with high dust and humidity such as small mines, cement plants, brick factories, paper mills, as well as control and protection of 3.3kV high-voltage motors (such as belt conveyors and water pumps). Gas insulated fully enclosed gas box (IP67 protection) can completely isolate dust and moisture, prevent insulation flashover accidents caused by pollution, and ensure uninterrupted production.
Tunnel lighting and infrastructure power distribution
Suitable for power distribution scenarios with strict spatial requirements and complex environments, such as highway tunnels, railway lines, ports, and docks.
Temporary power supply and mobile operations
A temporary power supply system used for construction sites, oil drilling platforms, or disaster relief. Lightweight design facilitates transportation and mobility, and standardized interfaces support multiple disassembly and reuse, reducing the cost of electricity investment for temporary projects.
