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NSHBG-35
NSHBG-35 Environmentally friendly gas-insulated ring main unit
NSHBG-35 35kV environmentally friendly gas insulated ring main unit is the core main equipment of domestic high-voltage distribution network. It adopts a mixture of dry air and new inert gas medium (GWP value=1), integrates large capacity high-voltage circuit breakers, high-precision metering and protection modules, intelligent load control units, and the gas box adopts reinforced steel structure and integrated sealing technology, with excellent high-voltage withstand, impact resistance and anti-interference performance. The equipment complies with GB/T 11022-2022 and the high-voltage distribution network standards of the power industry. It is optimized and designed for the characteristics of intensive 35kV distribution network load and high energy transfer demand in China. It is suitable for large-scale energy hubs, urban core distribution networks, industrial park high-voltage backbone lines and other scenarios. It is the preferred green alternative to traditional SF ₆ high-voltage ring main unit.
Features
1. Strong adaptability for energy transfer, with rated capacity and short-circuit breaking capacity adapted to the energy transfer needs of high-voltage distribution networks. It can stably carry the centralized transmission and load distribution of multiple energy sources such as thermal power, hydropower, and photovoltaics, avoiding overload and voltage fluctuations.
2. Extremely environmentally friendly and burden free, using dry air mixed with inert gases, no greenhouse effect, non-toxic, non corrosive, and can naturally diffuse after leakage, without the need for recycling, fully in line with China’s “dual carbon” policy and green power grid construction requirements.
3. Intelligent control deep adaptation, supporting IEC 61850 and DL/T 634.5.1-2002 dual protocols, can be connected to the provincial distribution network dispatch platforms of State Grid and Southern Power Grid, realizing remote opening and closing, fault location, and precise load control.
4. High voltage is safe and reliable, equipped with high-voltage insulation monitoring, arc light protection, and fault locking devices. The reinforced structure of the gas box can resist high-voltage arc impact, and the operating noise is ≤ 60 decibels, suitable for indoor and outdoor high-voltage distribution scenarios.
Rated current range: 1600A-4000A, rated short-circuit breaking current: 31.5kA-50kA, air box protection level IP67, suitable for ambient temperatures from -40 ℃ to+75 ℃, air leakage rate ≤ 0.06%/year, air box service life ≥ 25 years. Supports three operation modes: manual, electric, and remote. The module combination covers 3-12 circuits and supports mixed configuration of circuit breakers, fuses, and load switches. It is suitable for multiple needs such as high-voltage main line protection, branch distribution, and backup power switching. The equipment has special design for lightning protection and overvoltage protection.
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Specification
| Serial No. | Item | PT Module | V Module | |
| Disconnecting Switch | Vacuum Circuit Breaker | Isolation/Earth Switch | ||
| 1 | Rated Voltage | 35 | ||
| 2 | 1min Power Frequency Withstand Voltage | 70/80 | ||
| 3 | Lightning Impulse Withstand Voltage | 185/215 | ||
| 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 adapt to the diverse energy centralized grid connection needs of large energy hubs?
Fully adaptable, compatible with the output characteristics of different energy types such as thermal power, hydropower, and photovoltaics. The high-precision metering module supports multi energy sub item metering, and the intelligent load control unit can achieve dynamic balance of different energy outputs, avoiding energy grid connection conflicts.
Will dry air mixtures condense in low temperature and humid environments during winter?
No, the device is equipped with an intelligent anti condensation module, which can automatically adjust the humidity and temperature inside the air box through dual control of heating and ventilation. No condensation occurs even in a low temperature and high humidity environment of -40 ℃, ensuring stable insulation performance.
What remote control functions can be achieved after connecting to the provincial distribution network dispatch platform?
It can achieve remote opening and closing, real-time fault alarm and positioning, load statistics and analysis, voltage and frequency regulation, online monitoring of equipment status, etc. It supports automatic execution of dispatch instructions, greatly improving the efficiency of high-voltage distribution network operation and maintenance.
Related Applications
Large scale energy hub transfer and distribution scenario: Suitable for the transfer needs of 35kV high-voltage distribution networks in large energy hubs such as thermal power and hydropower. The large capacity design can support centralized energy transmission and load distribution, and the intelligent regulation function can achieve dynamic balance of different energy outputs, avoiding voltage fluctuations that affect grid stability. The high-precision metering module meets the measurement needs of energy trading, and the environmentally friendly gas meets the requirements of green transformation of energy hubs, helping to efficiently consume diverse energy sources.
High voltage distribution network scenario in urban core areas: In response to the high voltage distribution network needs of urban core business and government districts, the compact structure can be flexibly installed in the underground high voltage distribution room of the city, and the anti-interference design can resist the complex electromagnetic environment impact of the city. The intelligent boundary function can quickly isolate the faulty section, reduce the range of power outages, ensure continuous power supply to core areas such as commercial centers, government buildings, and transportation hubs, and at the same time, there is no hidden danger of environmental gas leakage and pollution, which is in line with the urban green power grid construction plan.
Distribution scenario of high-voltage main lines in heavy industrial parks: adapted to the power supply needs of 35kV high-voltage main lines in heavy industrial parks such as steel and non-ferrous metals, strengthened steel gas boxes can resist high-temperature radiation, mechanical vibration, and dust erosion in workshops, and stable short-circuit breaking performance can cope with the load impact of large smelting equipment, fans, and water pumps. Intelligent load regulation can avoid overload tripping, ensure continuous operation of production lines, and use environmentally friendly media to assist industrial parks in achieving green production transformation.
High voltage distribution scenarios for urban rail transit: As a supporting high-voltage distribution equipment for urban rail transit (subway, light rail), it can provide stable high-voltage power for traction substations, station lighting, and ventilation systems. The anti vibration design can cope with the vibration generated by the operation of rail transit, the anti condensation design can cope with the high humidity environment of underground stations, and the intelligent monitoring function can provide real-time feedback on equipment status, ensuring 24-hour uninterrupted power supply for rail transit and meeting the requirements of green development of urban public transportation.
