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NSHBG-15
NSHBG-15 Environmentally friendly gas-insulated ring main unit
NSHBG-15 15kV environmentally friendly gas insulated ring main unit is the main equipment designed for domestic medium and high voltage distribution network backbone lines and large new energy projects. It uses a mixture of CO ₂ and new inert gas medium (GWP value ≤ 8) to replace traditional SF ₆ gas, integrates large capacity circuit breakers, high-precision measuring transformers, intelligent boundary modules, and uses high-strength aluminum alloy material for the sealed gas box, balancing lightweight and impact resistance. The equipment complies with the high standard GB/T 11022-2022 and is optimized for the characteristics of dense load and long transmission distance in domestic 15kV distribution networks. It is suitable for scenarios such as centralized photovoltaics, large chemical parks, and urban distribution network backbone lines, achieving green and efficient upgrading of medium and high voltage distribution networks.
Features
1. With strong adaptability to large capacity, the rated current and short-circuit breaking capacity can adapt to the load requirements of medium and high voltage main lines, and can stably bear the high-power fluctuations of centralized new energy grid connection, avoiding overload tripping.
2. Environmental protection and performance balance, with a mixed gas insulation strength of 98% of SF ₆, excellent arc extinguishing efficiency, and 100% recyclable and reusable, with no environmental burden throughout the entire lifecycle.
3. With outstanding anti-interference ability and optimized electromagnetic shielding design, it can resist complex electromagnetic environment interference in the distribution network, ensuring measurement and control accuracy; The fourth is efficient installation and operation, with an integrated sealing process for the gas box. The air leakage rate is ≤ 0.06% per year, and normal operation for 8 years does not require gas replenishment. It supports online partial discharge monitoring and is suitable for large-scale distribution network operation and maintenance needs.
Rated current range: 1250A-3150A, rated short-circuit breaking current: 31.5kA-40kA, air box protection level IP67, suitable for ambient temperatures ranging from -40 ℃ to+70 ℃. Supports IEC 61850-9-2 communication protocol and can be connected to provincial distribution network automation platforms to achieve remote switching, fault location, and load statistics functions. The module combination covers 2-10 circuits and supports mixed configuration of circuit breakers and load switches, adapting to the protection and branch distribution needs of the main line. The equipment weight is reduced by 30% compared to traditional steel gas box models, making it easy to transport and install in special scenarios such as mountainous areas and high altitudes.
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Specification
| Serial No. | Item | PT Module | V Module | |
| Disconnecting Switch | Vacuum Circuit Breaker | Isolation/Earth Switch | ||
| 1 | Rated Voltage | 15 | ||
| 2 | 1min Power Frequency Withstand Voltage | 38/45 | ||
| 3 | Lightning Impulse Withstand Voltage | 95/110 | ||
| 4 | Rated Current | 630 | 630 | 630 |
| 5 | Short-Circuit Breaking Current | 20 | ||
| 6 | Short-Circuit Making Current | 50 | ||
| 7 | Short-Time Withstand Current | 20 | 20 | 20 |
| 8 | Short-Circuit Duration | 4 | 4 | 4 |
| 9 | Mechanical Life | 5000 | 10000 | 5000 |
| 10 | Gas Pressure | 0.025（20℃） | ||
| 11 | Annual Leakage Rate | ≤0.01% | ||
| 12 | Arc Extinguishing Method | Vacuum Arc Extinguishing | ||
| 13 | Protection Class | IP67/4X (Tank/Enclosure) | ||
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FAQs
Can the device meet the high-power grid connection requirements of centralized photovoltaic power plants?
Fully adapted, optimized arc extinguishing and current limiting design for photovoltaic output fluctuation characteristics, supports bidirectional current monitoring and fast response, and can stably carry the grid impact of photovoltaic power plants with a single capacity of over 50MW.
Does the corrosion resistance of the aluminum alloy gas box meet the standard?
Compliant, the surface of the gas box adopts a dual process of anodizing and anti-corrosion coating, which can resist industrial corrosion, outdoor humid and hot environments, and has a service life of ≥ 25 years, which is better than traditional steel gas boxes.
What types of faults can be identified through online partial discharge monitoring?
It can accurately identify potential faults such as insulation aging, poor contact, and component damage, with a monitoring accuracy of 1pC. At the same time, it can push the fault location and maintenance suggestions, reducing the difficulty of operation and maintenance.
Related Applications
Centralized photovoltaic power station grid connection scenario: Suitable for desert and mountainous centralized photovoltaic projects, with wide temperature tolerance to cope with extreme temperature differences, and stable support for high-power output and fluctuating current of photovoltaic arrays. Environmentally friendly gases are in line with the green positioning of new energy projects, and the intelligent monitoring function can remotely monitor the grid connection status, avoiding grid interruption caused by voltage fluctuations and helping to efficiently transmit photovoltaic energy to medium and high voltage distribution networks.
Distribution scenario of main lines in large-scale chemical industrial parks: In response to the characteristics of intensive load and high demand for continuous production in chemical industrial parks, the large capacity design can support stable power supply for large equipment such as reaction vessels and compressors. The sealed gas box can isolate corrosive gases and dust, avoiding component failures. Anti interference design ensures measurement and control accuracy, meets the requirements of refined and safe power distribution in chemical industrial parks, and at the same time, has no hidden dangers of environmental gas leakage and pollution.
Urban distribution network backbone line upgrade scenario: adapted to the load growth demand of mega city distribution network backbone lines, it can replace traditional SF cabinets to achieve green upgrades, and its compact structure can be flexibly installed in urban underground distribution rooms. The intelligent boundary function can quickly isolate faulty sections, reduce the scope of power outages, ensure continuous power supply for residents’ lives, commercial centers, and public facilities, and assist in the construction of urban intelligent distribution networks.
Auxiliary distribution scenario of pumped storage power station: To cope with the frequent high and low voltage conversion and large load impact of pumped storage power station, the stable short-circuit breaking performance of the equipment can resist the current impact generated by the start and stop of the water pump, and the low temperature resistant design is suitable for the low temperature environment in mountainous areas of the power station. To supply power to the auxiliary systems and control equipment of the power station, the intelligent monitoring function can predict faults in advance, ensuring efficient operation and safe operation of the pumped storage power station.
