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12KV Environmentally Friendly Gas-insulated Switchgear
Cotenele is a large switchgear manufacturer and exporter in China, and our 12KV Environmentally Friendly Gas-insulated Switchgear has gained widespread recognition from users in the European and South American markets.This environmentally friendly gas-insulated switchgear uses low-pressure dry air and nitrogen and other environmentally friendly gases as the insulating medium and is widely used in industrial and civilian ring network distribution systems, such as small secondary distribution substations, industrial and mining enterprise substations, urban residential areas, airports, railways, and other places.
As the market share of environmentally friendly switchgear continues to grow globally, Cotenele has become one of important suppliers of 12KV Environmentally Friendly Gas-insulated Switchgear in the power industry.
12kV environmentally friendly gas-insulated switchgear refers to metal-enclosed switchgear used in power systems with a rated voltage of 12 kV for receiving and distributing electrical energy, where the insulation and arc-quenching medium is not primarily SF₆ (sulfur hexafluoride, a potent greenhouse gas). Instead, it employs technologies such as dry air, nitrogen, eco-friendly gas mixtures, or solid insulation materials, aiming to reduce or eliminate greenhouse gas emissions and environmental pollution.Our environmentally friendly gas-insulated switchgear meet the relevant international standard such as IEC 62271， (EU) 2024/573，IEEE/ANSI C37.20 and UL/NEMA standards
Why Environmentally-Friendly？
The core "environmental friendliness" is reflected in:
- Eco-friendly insulation medium: Sf6 free,Primary parts，such as switch, busbars，are sealed in a stainless steel gas tank filled with eco-friendly gas such as dry air and N2. Vacuum interrupters handle short-circuit breaking.Dry air or nitrogen with a Global Warming Potential (GWP) close to zero. At the end of its life cycle, the gas can be directly released into the atmosphere without special recovery.
- Recyclable materials: Over 90% of materials can be recycled when the product end of life, this can reduce resource waste and environmental pollution .
- Low-carbon operation: Some models reduce energy consumption through optimized design and natural convection cooling (fanless operation).
Working conditions
1. Ambient air temperature: maximum +40°C, minimum -50°C
2. Relative air humidity: daily average not greater than 95%, monthly average not greater than 90%
3. Altitude ≤1500 m (under standard inflation pressure)
4. Seismic intensity not exceeding magnitude 8
5. Locations free from fire, explosion, heavy pollution, chemical corrosion, and severe vibration
Special conditions：
- For special operating conditions that differ from normal operating conditions, agreement shall be reached between the manufacturer and the end user. If exceptionally harsh operating environments are involved, consultation with the manufacturer and supplier is mandatory.
- When electrical equipment is installed at an altitude above 2000 m, special indication shall be provided so that the enclosure structure can be adjusted during manufacturing.
Main technical parameters
| Item | V-Unit | C-Unit | |
| Circuit Breaker | Load Switch | ||
| Rated Voltage | 12 kV | ||
| Rated Frequency | 50 Hz | ||
| Rated Current | 630 A | ||
| Rated Short-time Withstand Current | 20 kA/4 s | ||
| Rated Short-circuit Making Current (Peak) | 50 kA | ||
| Rated Peak Withstand Current | 50 kA | ||
| Rated Short-circuit Breaking Current | 20kA | / | |
| 1-min Power-frequency Withstand Voltage | Phase-to-phase & phase-to-earth | 42 kV | |
| Break Contact | 48 kV | ||
| Lightning Impulse Withstand Voltage | Phase-to-Phase & Phase-to-Earth | 75 kV | |
| Break Contact | 85 kV | ||
| Main Circuit Resistance | ≤140 μΩ | ||
| Mechanical Endurance | Circuit Breaker / Load Break Switch | 10,000 operations | |
| Disconnector / Earthing Switch | 3,000 operations | ||
| Electrical Endurance | Circuit Breaker / Load Break Switch | 30 operations | 5 operations |
| Earthing Switch Closing | 2 operations | 2 operations | |
| Rated Supply Voltage for Secondary Circuit | DC 24/48 V, AC/DC 220/110 V | ||
| Arc Duration | 0.5 s | ||
| Degree of Protection of Enclosure | IP4X | ||
| Degree of Protection of Sealed Enclosure | IP67 | ||
| Rated Gas Pressure (20°C Gauge Pressure) | 0.02 MPa | ||
| Annual Gas Leakage Rate | 0.1% | ||
The Structure Of environmentally friendly switchgear/RMU?
12kV environmentally friendly switchgear typically adopts a modular design, with flexible combination of functional units that can be sealed in a common gas tank or separately. The structure can be arranged with upper isolation or lower isolation. The main components are divided into the following sections:
Compartments
1. Gas-insulated compartment :The core sealed chamber of the switchgear, filled with dry air or nitrogen. All primary live parts (busbars, switches, connections) are completely sealed, achieving IP67 protection rating, unaffected by external environment.
2. Mechanism compartment :Located outside the gas‑insulated compartment, housing the operating mechanisms and secondary components for local and remote operation.
Cable compartment:The main function of the cable compartment is used to connect incoming and outgoing cables, usually located at the bottom of the switchgear, equipped with observation windows, lighting equipment, and mechanical interlocking devices for safety.
3. Low-voltage compartment (instrument box):The low-voltage compartment (instrument box) is usually located at the top of the switchgear and is mainly used to install secondary equipment such as protective relays, intelligent monitoring modules, and energy meters.
4. Pressure relief channel:The pressure relief channel is located on one side of the gas insulated chamber and is equipped with rupture discs, which can safely release pressure in extreme fault situations to ensure the safety of operators and equipment.
Core Internal Components:
1. Vacuum interrupter :The arc‑quenching core of the circuit breaker or load break switch. It extinguishes the arc in a high vacuum, offering long life, maintenance‑free operation, and high breaking capacity.
2. Three‑position disconnecto:Integrates closed, isolated, and earthed positions. Often combined with the vacuum switch for circuit switching and safe isolation. The difference between upper and lower isolation lies in its position relative to the breaker.
3. Main busbar:Conductors for collecting and distributing electrical energy. Side or top extension connections allow flexible combination and expansion between switchgear units.
4. Operating mechanism:Provides power for opening/closing the switch and incorporates a complete “five‑prevention” mechanical interlock system.
5. Intelligent monitoring & protection devices : Includes gas monitoring equipment, voltage presence indicators, current/voltage sensors, microprocessor‑based integrated protection relays, and smart online monitoring solutions (density relays, pressure gauges, temperature, moisture monitoring) supporting distribution automation and remote control.
6. Other components : Cable terminations, surge arresters, instrument transformers, etc.
Classification
| Classification Basis | Type | Description |
| Insulation medium | Gas-insulated | Uses dry air or nitrogen as insulation-the mainstream technology. |
| Solid-insulated | Uses epoxy resin or other solid materials for full insulation(some types SF₆-free) | |
| Atmospheric air-insulated | Uses normal air with compact design. | |
| Disconnector position | Upper isolation(busbar side) | Three-position switch located above the breaker. |
| Lower isolation(line side) | Three-position switch located below the breaker. | |
| Functional unit type | C unit (load switch) | For switching load currents. |
| V unit(circuit breaker) | Provides short-circuit protection. | |
| D unit(cable connection module) | For incoming/outgoing cable connection and expansion. | |
| PT unit(voltage transformer) | Provides voltage signals for measurement and protection. | |
| M unit(metering) | For energy metering. | |
| Enclosure structure | Common gas tank | Multiple functional units sealed in one gas tank. |
| Extendable type | Each unit has its own gas tank,connected via extension busbars. | |
| Modular combination | Supports flexible configuration,arbitrary arrangement according to distribution needs. |
Our Workshop
Key Product Advantages
1. Green & environmentally friendly
Insulation medium GWP close to zero or zero; completely SF₆‑free, no greenhouse gas emissions; high material recyclability.
2. Safe & reliable
Fully insulated and sealed -live parts unaffected by external environment; meets insulation requirements even at zero gauge pressure; high protection rating (IP67 for gas tank); complete five-prevention interlocking.
3. Compact structure
Volume comparable to same-spec SF₆ switchgear (width can be 460 mm, 420 mm, etc.); small footprint; can be wall‑mounted, greatly saving substation space.
4. Maintenance-free or low maintenance
Long life of vacuum interrupters (e.g., 10,000 mechanical operations); HV insulation parts not prone to aging; main components require no periodic maintenance; reduced operating costs.
5. Strong environmental adaptability
Stable operation under harsh conditions: high altitude, extreme cold, humidity, pollution, coastal salt fog, strong sandstorms.
6. High intelligence level
Supports online monitoring and early warning of gas pressure, temperature, moisture, current, voltage; integrates distribution automation and IoT functions.
7. Flexible expansion
Modular design supports side expansion, top expansion, common gas tank, or separate gas tanks; convenient on‑site assembly and connection.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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