Eco-friendly Air-insulated AC Metal-enclosed Switchgear
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of eco-friendly air-insulated ac metal-enclosed switchgear in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced eco-friendly air-insulated ac metal-enclosed switchgear from our factory. Also, quotation is available.
Product Overview
The TRXGN-12/T630-20 eco-friendly air-insulated AC metal-enclosed switchgear is designed for three-phase 50 Hz, 12 kV distribution systems, for receiving and distributing electrical energy. It adopts air insulation with no SF6 filling; the insulating medium has no greenhouse effect, and the unit is manufactured in accordance with IEC 62271-200. The compact construction suits confined installations; typical applications include small secondary substations, switching stations, industrial plants, residential communities, airports, railways, tunnels, high-rise buildings and box-type switching stations.
Product Features
SF6-free
Dry air or an eco-friendly gas mixture is used; GWP is close to zero, and SF6 filling and emission management are not involved.
Fully sealed tank
Tank enclosure IP65, leakage rate controlled per standard; since the gas has no greenhouse effect, any leakage has limited environmental impact.
Compact design
Load switches, breakers and busbars are integrated in one sealed tank, reducing footprint for skid-mounted substations and confined spaces.
Simple maintenance
Under normal operating conditions, internal components are isolated from the ambient; routine checks mainly cover mechanisms, instruments and appearance.
Modular extension
Line combinations can be built up with protection and automation terminals.
Controlled temperature rise and partial discharge
Type-tested per IEC 62271-200; partial discharge measured per IEC 60270.
Type Designation
Technical Parameter
|
Item |
Unit |
Circuit-breaker unit |
Load switch unit |
|
Rated voltage |
kV |
12 |
12 |
|
Rated frequency |
Hz |
50 |
50 |
|
Rated current |
A |
630 |
630 |
|
Power-frequency withstand voltage (1 min) |
kV |
Phase-to-earth / phase-to-phase 42; across isolating distance 48 |
/ |
|
Lightning impulse withstand voltage |
kV |
Phase-to-earth / phase-to-phase 75; across isolating distance 85 |
/ |
|
Rated short-time withstand current and duration |
kA |
Main circuit 20/4 s; earthing circuit 17.4/2 s |
/ |
|
Rated peak withstand current |
kA |
Main circuit 50; earthing circuit 43.5 |
/ |
|
Rated short-circuit making current (peak) |
kA |
50 |
/ |
|
Rated short-circuit breaking current |
kA |
20 |
/ |
|
Number of short-circuit breaking operations |
times |
30 |
/ |
|
Rated operating sequence |
/ |
O-0.3s-CO-180s-CO |
/ |
|
Rated cable/line charging current breaking test |
kA |
Class C2 |
/ |
|
Out-of-phase earth fault breaking current |
kA |
17.4 |
/ |
|
Rated active load breaking current |
A |
/ |
630 |
|
Rated closed-loop breaking current |
A |
/ |
630 |
|
Rated cable charging current breaking test |
A |
/ |
10 |
|
5% rated active load breaking current |
A |
/ |
31.5 |
|
Earthing switch making operations |
times |
5 |
/ |
|
Circuit resistance |
μΩ |
≤140 |
/ |
|
Rated gas pressure (gauge, 20 ℃) |
MPa |
0.02 |
/ |
|
Mechanical endurance |
times |
Vacuum switch 10000; disconnector 3000; earthing switch 3000 |
/ |
|
Degree of protection |
/ |
Enclosure IP4X; gas tank IP67 |
/ |
|
Operating supply voltage |
V |
AC220 / DC220 / DC110 / DC48 / DC24 |
/ |
|
Rated annual gas leakage rate |
% |
≤0.1 |
/ |
|
Cubicle dimensions (single circuit) |
mm |
420×822×1420 |
/ |
|
Internal arc fault withstand |
kA/s |
20/0.5 |
/ |
|
Moisture content in dry air |
ppm |
≤150 |
/ |
Normal Use Conditions
- Ambient air temperature: upper limit +40℃, lower limit -40℃.
- Humidity: daily average of relative humidity not exceeding 95%; monthly average not exceeding 90%.
- Water vapour pressure: daily average not exceeding 2.2 kPa; monthly average not exceeding 1.8 kPa.
- Altitude: not exceeding 2000m.
- Ambient air without obvious pollution by dust, smoke, corrosive or flammable gases, vapours or salt mist.
- Amplitude of induced electromagnetic interference in the secondary system not exceeding 1.6 kV.
Application
- Collector and grid-connection switching for photovoltaic, wind and storage plants.
- Loop distribution and switching stations in urban distribution networks.
- Rail transit, data centers and industrial distribution.
- Projects in regions with SF6 emission controls (e.g. EU F-Gas regulated areas).
FAQ
Q1: Why not use SF6 Switchgear?
SF6 has a strong greenhouse effect (GWP far higher than CO2), and regulations such as the EU F-Gas are restricting its use. This product replaces it with dry air or an eco-friendly gas mixture with a GWP close to zero.
Q2: Where is it used?
PV/wind/storage grid connection, distribution loop networks, rail transit, data centers; particularly suitable for countries and regions restricting SF6 emissions.
Q3: Is air insulation reliable?
The insulation performance is verified by type tests per IEC 62271-200 (lightning impulse, power-frequency and partial discharge tests) using a pressurized tank and optimized field distribution, meeting 12 kV system requirements.
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