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NSRM-35
NSRM-35 SF6 gas-insulated ring main unit
The NSRM-35 35kV SF6 gas-insulated switchgear is a mainstream medium and high-voltage distribution network equipment in China. Featuring a fully sealed and modular design, it utilizes SF6 gas as the insulation and arc-extinguishing medium, integrating components such as circuit breakers, load switches, earthing switches, transformers, and protection devices. It boasts characteristics like compact size, high reliability, low operation and maintenance costs, and strong adaptability. The product optimizes insulation and arc-extinguishing structures, meeting power supply demands for various scenarios including urban distribution networks, industrial enterprises, and new energy power stations. It serves as a core device for enhancing the intelligence and reliability of distribution networks.
Features
1. Mainstream Compatibility:
Fully compliant with the domestic 35kV distribution network standards, it is compatible with the majority of medium and high-voltage distribution network architectures in China. It can directly replace traditional switchgear cabinets without requiring adjustments to the distribution network design, offering an extremely wide range of applications.
2. Excellent Arc-Quenching Performance:
Equipped with an SF6 arc-extinguishing chamber, it can handle short-circuit breaking currents up to 50kA with reliable interruption, no residual arc after quenching, and rapid power restoration, making it suitable for scenarios with high fault currents in distribution networks.
3. Flexible Modular Configuration:
Featuring a unitized modular design, it can be assembled into circuit breaker cabinets, load switch cabinets, metering cabinets, PT cabinets, etc., according to requirements. It supports future expansion and modification, adapting to diverse distribution network needs.
4. Low Maintenance Cost:
With sealing performance reaching IP67 level and an extremely low SF6 gas leakage rate, routine inspection and maintenance are unnecessary. Only periodic gas pressure monitoring is required, reducing operational costs by over 60% compared to traditional switchgear cabinets.
5. Intelligent Interconnection for Efficiency:
Supports the IEC 61850 communication protocol, enabling seamless integration with distribution automation systems to achieve remote monitoring, control, fault location, and self-healing, meeting the requirements of smart distribution network construction.
The NSRM-35 product has a rated current of 630A-3150A, a rated short-time withstand current of 50kA/3s, and a rated peak withstand current of 125kA. The rated insulation level is 125kV/1min for relative-to-ground and 125kV/1min for phase-to-phase. It operates within an ambient temperature range of -40℃ to +70℃, with an altitude adaptation capability of ≤4000m and an IP67 protection rating. The SF6 gas filling capacity is 10-25kg, equipped with both mechanical and electronic density monitoring devices for dual protection of gas conditions. The cabinet body is constructed from cold-rolled steel or stainless steel, offering excellent corrosion resistance and suitable for indoor or outdoor installation. equipment.
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Specification
| Item | Unit | Model C | Model F | Model V | Model CB |
| Rated voltage | kV | 35 | 35 | 35 | 35 |
| Rated frequency | Hz | 50 | 50 | 50 | 50 |
| Power frequency withstand voltage (phase to phase/port) | kV | 70/80 | 70/80 | 70/80 | 70/80 |
| Lightning impulse withstand voltage | kV | 185/215 | 185/215 | 185/215 | 185/215 |
| 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 the installation cycle of a 35kV SF6 gas-insulated switchgear long?
The installation cycle is short, with modular design enabling rapid assembly. The installation and commissioning time for a single unit does not exceed 8 hours, reducing the overall installation period of the entire distribution equipment by 50% compared to traditional switchgear, significantly minimizing power outage time.
What are the advantages of SF6 gas-insulated switchgear compared to gas-insulated switchgear?
Compared to air-insulated cabinets, SF6 gas-insulated switchgear offers superior insulation performance, smaller size, stronger weather resistance, and can adapt to harsh environments with lower maintenance costs. In contrast to vacuum-insulated switchgear, it provides more stable arc-extinguishing performance, making it suitable for high-current and high-voltage applications.
How to handle gas leakage in the equipment?
First, locate the leaking gas compartment through the density alarm signal, then close the corresponding compartment valve. Use a leak detector to identify the leakage point, repair it, replenish SF6 gas, and conduct a gas tightness test. The entire process can be completed within 4 hours.
Can it be used for the distribution network of new energy power stations?
Yes, it is specifically optimized for new energy scenarios, capable of withstanding the fluctuating currents of photovoltaic and wind power, supports grid-connected operations, and can be used in the voltage boosting and power distribution stages of new energy power stations to ensure grid-connected stability.
What is the mechanical operational lifespan of the product?
The circuit breaker has a mechanical lifespan of 10,000 operations, while the load switch reaches 20,000 operations, meeting the demands of frequent operation scenarios. Its service life far exceeds that of traditional switchgear, making it suitable for distribution network applications with high operational frequency.
Does it have fireproof function?
Equipped with a cabinet made of flame-retardant materials, SF6 gas is non-combustible and non-explosive. Additionally, it features fireproof partitions and pressure relief devices, effectively blocking fire spread and preventing the escalation of fire from affecting the operation of other equipment.
Related Applications
Urban distribution network substations, switch stations, and ring main units are the core equipment of medium and high voltage distribution networks.
High voltage distribution systems for two large industrial enterprises, chemical industrial parks, and metallurgical plant areas to meet high load demands.
Supporting distribution network equipment for photovoltaic, wind power, and energy storage power stations to ensure stable integration of new energy into the grid.
Supporting power distribution for transportation infrastructure such as railways and highways to adapt to complex outdoor environments.
High voltage distribution for high-rise buildings, commercial complexes, and data centers to ensure reliable power supply.
