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NRTs-40.5 kV SF6 Gas Insulated Ring Main Unit

NRTs-40.5
NRTs-40.5
NRTs-40.5 kV SF6 Gas Insulated Ring Main Unit

A 40.5 kV fully sealed SF6 gas insulated ring main unit with an IP67 stainless-steel gas tank, Internal Arc Classification (IAC) 25 kA/1 s internal arc protection, and full-life cycle intelligent health management.

Health Management
Full-Lifecycle Intelligent
Modular Flexible Expansion
Extreme Environment Adaptability
IAC 25 kA/1 s Internal Arc Protection
IP67 Fully Sealed Stainless-Steel Gas Tank
Model:NRTs-40.5
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Key Benefits

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IP67 Fully Sealed Stainless-Steel Gas Tank
304 stainless-steel laser-welded gas tank with annual leakage rate ≤0.25‰, fully resistant to condensation, salt mist, corrosion and UV aging.
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IAC 25 kA/1 s Internal Arc Protection
Built-in dedicated pressure relief channel; passed 25 kA/1 s internal arc fault test to protect personnel safety.
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Full-Lifecycle Intelligent Health Management
Integrates five online monitoring functions: partial discharge, mechanical characteristics, contact temperature rise, temperature and humidity, and video recognition.
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Modular Flexible Expansion
Supports both top and side expansion, with a unified single-unit expansion width of 450 mm and reserved expansion interfaces.

Product Overview

NRTs-40.5 kV is a 40.5 kV SF6 gas insulated ring main unit developed by NATUS Electric for medium- and high-voltage distribution systems.
The product uses a high-quality stainless-steel gas tank manufactured by laser cutting and automatic robotic welding. After vacuum pumping and leak testing, SF6 insulating gas is filled into the tank, fully sealing all high-voltage live components such as the circuit breaker, load break switch and busbar. The gas tank reaches IP67 protection and is not affected by external environmental factors. It integrates a Distribution Terminal Unit (DTU) bay unit and a full-lifecycle health management system, supporting remote measurement and control, fault diagnosis and intelligent operation and maintenance. The product fully complies with GB/T 3906, IEC 62271 and other domestic and international standards, and is widely used in substations, renewable energy, petrochemical, industrial and other medium- and high-voltage distribution scenarios.
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Product Structure

The cable compartment can only be opened when the feeder is isolated or earthed. The bushing complies with the DIN EN 50181 standard, features an M16 bolt connection, and the surge arrester can be connected behind the T-type cable joint.
The integrated current transformer (CT) is located on the bushing side, facilitating easy cable installation and being unaffected by external forces. The height from the bushing installation position to the ground is more than 690mm.

Technical Advantages

01.
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Highly Reliable Arc Extinguishing and Operating Mechanism
The circuit breaker unit has a mechanical life of 10,000 operations, and the disconnector / earthing switch has a mechanical life of 5,000 operations. The spring operating mechanism operates stably and supports both electric and manual operation, ensuring reliable opening and closing under extreme operating conditions.
02.
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Extreme Environment Adaptability
Operating temperature range from -45°C to +75°C, humidity ≤95% and altitude ≤2000 m. The stainless-steel gas tank and anti-corrosion coating adapt to high-altitude, severe-cold, high-temperature, high-salt-mist and other harsh environments.
03.
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Modular Bi-Directional Expansion Technology
Supports both top and side expansion, with a unified single-unit expansion width of 450 mm. Standard units can be freely combined into various main connection schemes, and later capacity expansion can be carried out without power outage reconstruction, protecting the initial investment.

Technical Specifications

Circuit Breaker Unit


Basic Parameters
Rated VoltagekV40.5
Power Frequency Withstand VoltagekV95/118
Lightning Impulse Withstand VoltagekV190/220
Rated CurrentA630
Rated Short-Circuit Breaking CurrentkA20(25)
Rated Short-Circuit Making CurrentkA50(63)
Rated Short-Time Withstand CurrentkA/s20(4) / 25(4)
Mechanical LifeTimeCircuit Breaker: 10,000 / Isolation: 5,000 / Earthing: 5,000



Load Switch Unit


Basic Parameters
Rated VoltagekV40.5
Power Frequency Withstand VoltagekV95/118
Lightning Impulse Withstand VoltagekV190/220
Rated CurrentA630
Rated Short-Circuit Breaking CurrentkA20(25)
Rated Short-Circuit Making CurrentkA50(63)
Rated Short-Time Withstand CurrentkA/s20(4) / 25(4)
Mechanical LifeTimeCircuit Breaker: 10,000 / Isolation: 5,000 / Earthing: 5,000



Circuit Breaker Unit (Busbar Grounding)


Basic Parameters
Rated VoltagekV40.5
Power Frequency Withstand VoltagekV95/118
Lightning Impulse Withstand VoltagekV190/220
Rated CurrentA630
Rated Peak CurrentkA50(63)
Rated Short-Time Withstand CurrentkA/s20(4) / 25(4)
Mechanical LifeTimeLoad: 5,000 / Earthing: 5,000



Commonly Used Standards


Basic Parameters
IEC 62271-200:2011High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV
GB/T 3906-20063.6kV~40.5 kV AC metal-enclosed switchgear and controlgear
GB/T 11022-2011Common specifications for high-voltage switchgear and controlgear standards
GB/T 1984-2014High-voltage alternating-current circuit breakers
GB/T 3804-2017High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5 kV
GB/T 1985-2014High-voltage alternating-current disconnectors and earthing switches
IEC 62271-105High-voltage switchgear and controlgear - Alternating-current switch-fuse combinations
IEC 62271-103High-voltage switchgear and controlgear - Switches for rated voltages above 1kV and up to and including 52kV
IEC 60265-1High-voltage switches - Part 1: Switches for rated voltages above 1kV and less than 52kV
DL/T 404-2018AC metal-enclosed switchgear and controlgear
DL/T 593-2016Common specifications for high-voltage switchgear and controlgear standards



General Characteristics


Basic Parameters
Altitude≤ 2000 m
Ambient temperature-25°C to +40°C
Daily average temperature≤ 35°C
Relative humidityDaily average ≤95%; monthly average ≤90%
Pollution degreeII / Ⅲ / Ⅳ (as required by project conditions)
Installation locationIndoor, free from severe vibration, corrosive gas and conductive dust



Operating Conditions


Basic Parameters
Ambient air temperatureMaximum: +40°C; minimum: -25°C; average over 24h: ≤35°C
HumidityDaily average relative humidity ≤95%; monthly average relative humidity ≤90%
Altitude≤ 2000 m
Installation environmentIndoor installation; no obvious vibration, no corrosive or explosive gas, and no severe dust pollution
Seismic intensitySuitable for normal substation operating environment



Cabinet Construction Method


Basic Parameters
Top-Expansion Cabinet Combination MethodCabinets are combined through the top-expansion interface to realize busbar extension and cabinet-to-cabinet connection.
Side-Expansion Cabinet Combination MethodCabinets are combined through the side-expansion interface to support flexible line-up configuration.

Application
新能源
石油石化
工业行业
市政商业

Product FAQ

Yes. The gas tank uses 304 stainless-steel laser welding and undergoes helium mass spectrometry leak detection and a 0.3 bar underwater immersion test for 24 hours. The protection class reaches IP67 and can completely prevent dust and water ingress.
Yes. NRTs-40.5 kV is designed for an operating temperature range from -45°C to +75°C, with an intelligent heating and dehumidification device to ensure reliable operation under extreme low temperature conditions.
Top expansion and side expansion are supported, with a unified single-unit expansion width of 450 mm. The modular design allows later capacity expansion without power outage reconstruction by adding the corresponding units.
It includes five functions: in-cabinet partial discharge detection, mechanical characteristic detection, contact temperature rise monitoring, automatic temperature and humidity control, and in-cabinet video recognition, enabling real-time equipment status monitoring and fault warning.
The annual leakage rate is ≤0.25‰. Under normal operating conditions, no gas replenishment is required within 30 years, enabling maintenance-free operation.
Yes. It is equipped with a standard DTU bay unit and supports standard communication protocols, enabling seamless connection with various distribution automation systems and Supervisory Control and Data Acquisition (SCADA) systems.
The product has passed the 25 kA/1 s internal arc fault test. A built-in dedicated pressure relief channel directs fault arc energy outside the cabinet; the cabinet door does not burst open, providing personnel protection.

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    Email: icd@natus-cn.com
    Tel: 400-928-1888
    Add: No. 369, Labor East Road, Tianning District, Changzhou City, Jiangsu Province
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