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NSHBG-3.3
NSHBG-3.3 Environmentally friendly gas-insulated ring main unit
The NSHBG-3.3 3.3kV environmentally friendly gas-insulated ring main unit is a ring main power supply device specifically designed for low-voltage high-power distribution scenarios and special industrial environments. It replaces traditional SF₆ with fluorine-free eco-friendly gases such as dry air and N₂/O₂ mixed gases, integrating core components like load switches, disconnectors, and earthing switches within a sealed gas chamber. This equipment complies with the GB/T 11022 national standard, featuring an extremely compact structure and superior protection performance. It is suitable for applications in mines, metallurgy, shipbuilding, and other environments with specific requirements for voltage levels, environmental friendliness, and space utilization. It not only ensures stable power supply for low-voltage high-power distribution but also eliminates the environmental impact of SF₆ gas, achieving green power supply.
Features
1. With prominent environmental attributes, it employs a GWP (Global Warming Potential) of 1 eco-friendly gas, which has no greenhouse effect. After disposal, it can be directly emitted or simply treated, fully aligning with the “dual carbon” policy and the requirements for green factory construction.
2. Strong resistance to harsh environments: The air tank is welded with high-strength cold-rolled steel plates, achieving a protection rating of IP67, capable of withstanding high temperatures, humidity, dust, oil contamination, and mild corrosion, making it suitable for complex industrial site conditions.
3. The operation and maintenance cost is extremely low, with excellent gas sealing performance, a leakage rate of ≤0.1%/year, and no need for gas replenishment during normal operation. The components are sealed and isolated from external interference, extending the maintenance cycle to over 8 years. Additionally, the start-stop performance is stable, featuring an optimized arc-extinguishing structure for low-voltage high-capacity scenarios. The switching speed is fast, allowing frequent start-stop cycles to adapt to intermittent loads, while the operating noise is ≤55 decibels, making it suitable for indoor enclosed spaces.
NSHBG-3.3 Rated current range: 400A-1600A, Rated short-circuit breaking current: 12.5kA-20kA, Applicable ambient temperature: -40℃ to +70℃. Supports manual/electric dual operation modes, equipped with a complete secondary control circuit, and can be integrated into industrial control systems for local and remote operation. The gas chamber features anti-condensation and explosion-proof design, with a built-in gas pressure monitoring module that triggers automatic alarms in case of anomalies. The modular design supports single, dual, and multi-circuit expansion, allowing flexible configuration based on on-site requirements to adapt to various power supply architectures.
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Specification
| Serial No. | Item | PT Module | V Module | |
| Disconnecting Switch | Vacuum Circuit Breaker | Isolation/Earth Switch | ||
| 1 | Rated Voltage | 3.3 | ||
| 2 | 1min Power Frequency Withstand Voltage | 10/12 | ||
| 3 | Lightning Impulse Withstand Voltage | 20/23 | ||
| 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 | |||
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FAQs
Is there a difference in insulation and arc extinguishing performance between environmentally friendly gases and SF gases?
There is no significant difference. By optimizing the gas box structure and gas ratio, the insulation strength and arc extinguishing efficiency can reach over 95% of SF gas, fully meeting the power supply demand of 3.3kV level.
Is the device suitable for mobile/vibration scenarios such as ships and mines?
Adaptation: The air box has undergone seismic reinforcement design and can withstand ship navigation vibration and mining blasting impact. It also has anti salt spray and anti dust capabilities, making it suitable for installation in special scenarios.
Do environmentally friendly gases need to be replaced regularly?
No need for regular replacement. Under normal operation, the gas service life is synchronized with the equipment life cycle (20 years), and only regular pressure monitoring is required.
Related Applications
Underground auxiliary power distribution scenario in mines: Suitable for complex environments such as narrow underground tunnels, high humidity and dust, and slight vibrations. The compact size can be flexibly installed in temporary power distribution points or fixed power distribution rooms underground. Explosion proof and anti condensation design can prevent the erosion of equipment by underground water vapor and dust, and provide stable power supply for auxiliary equipment such as ventilation fans, drainage pumps, and transport winches. There is no risk of leakage of environmentally friendly gases, avoiding pollution of underground enclosed spaces, and ensuring the dual requirements of mining operation safety and ecological protection.
Low pressure and high configuration scenarios in metallurgical factories: For high-temperature, dusty, and heavily oily working conditions in metallurgical workshops, equipment sealed gas boxes can isolate iron filings, oil stains, and high-temperature radiation, avoiding component aging and failure. Frequent start stop performance is suitable for intermittent loads such as metallurgical furnaces and conveyor belts, with environmentally friendly gases and no greenhouse effect, meeting the requirements of green transformation in the metallurgical industry. At the same time, low operation and maintenance needs can reduce workshop downtime for maintenance, ensuring production continuity.
Ship and ocean platform power distribution scenarios: Suitable for ship engine rooms, narrow spaces on ocean platforms, and salt spray corrosion environments. The surface of the air box has undergone special anti-corrosion treatment to resist seawater salt spray erosion, and the seismic structure can adapt to the bumpy vibrations during ship navigation. To provide stable power supply for ship power systems, navigation equipment, and living facilities, environmentally friendly gases meet the environmental standards of the International Maritime Organization, and avoid pollution of the marine environment.
Data center backup power distribution scenario: As the core distribution equipment of the UPS backup power supply in the data center, the compact design can save room space and operate with low noise without interfering with the room environment. Environmentally friendly gas is non-toxic and non corrosive, ensuring the safety of personnel and precision equipment in the data center. Its stable start stop performance can quickly switch to backup power in case of power interruption, preventing data loss and meeting the green and efficient operation and maintenance needs of data centers.
