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Indoor Gas Insulated Metal-Enclosed Switchgear XGN (XGTD6)-12(2from China Suppliers and Factory
General
The primary live parts and switches of the switchgear are enclosed in a stainless steel casing, which protects them from external environmental influences. The switchgear employs a modular design, allowing for arbitrary arrangement according to different design schemes to achieve combinations of common-box and expandable units. This meets the demand for compact switchgear in various secondary distribution substation. It can be widely applied in small secondary distribution stations, box-type switchgear stations, industrial and mining enterprises, airport, railways, commercial district, high-rise building, highways, subways, tunnels and other places with harsh natural conditions.
Standard
The product quality assurance is based on the continuous improvement of research, development, design, and production processes in compliance with the requirements of the quality system. It fully complies with the latest versions or their revised versions of the following standards, specifications, and guidelines, and is not limited to these.
| IEC62271-200 | AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV. |
| EN50181 | Insertion bushings for equipment rated at voltages from 1 kV to 52 kV and currents from 250 A to 2500 A. |
| GB/T3906 | AC metal-enclosed switchgear and controlgear for rated voltages above 3.6 kV and up to and including 40.5 kV |
| GB/T11022 | Common specifications for high-voltage switchgear and controlgear standards |
| DL/T404 | AC metal-enclosed switchgear and controlgear for rated voltages above 3.6 kV and up to and including 40.5 kV |
| GB/T1984 | High voltage AC circuit breaker |
| GB/T1985 | High-voltage alternating-current isolators and earthing switches. |
| GB/T20840 | Instrument transformers - Part 1: General requirements. |
| GB/T11032 | AC Metal oxide surge arresters without gaps |
Type and designation
Service conditions
a. Ambient temperature: - 45℃ - +50℃, the daily average value shall not exceed 35℃
b. Relative humidity: Daily average is not more than 95%, Monthly average is not more than 90%
c. Altitude: ≤4000m (if the equipment runs above 1000m, please specify it so that the inflation pressure can be adjusted during manufacture)
d. Seismic grade: the seismic intensity shall not exceed grade 8
e. Environmental pollution: There shall be no Corrosive, flammable gases or other pollution.
※Note: if the service environment exceeds the above conditions, please consult with our company.
Technical parameter
| Item | Unit | Parameters | ||||
| Load switch | Composite apparatus | CB | ||||
| Rated voltage | kV | 12/24 | ||||
| Rated frequency | Hz | 50/60 | ||||
| Rated current | A | 630, 1250 | 125 (Depends on fuse current) | 630,1250 | ||
| Rated insulation level | 1 min power frequency withstand voltage | Phase to phase, phase to earth | kV | 42/65 | ||
| Insulation distance | 48/79 | |||||
| Control and auxiliary circuits | 2 | |||||
| Lightning impulse withstand voltage | Phase to phase, phase to earth | 75/125 | ||||
| Insulation distance | 85/145 | |||||
| Rated short time withstand current | kA/s | 20/4,25/4 | / | 20/4,25/4 | ||
| Rated peak withstand current | kA | 50,63 | / | 50,63 | ||
| Rated short-circuit making current (peak) | kA | 50,63 | Limited by HV fuse | 50,63 | ||
| Rated short-circuit breaking current (r.m.s) | kA | / | Limited by HV fuse | 20/25 | ||
| Rated transfer current | A | / | 1700/1400 | / | ||
| Rated active load breaking current | A | 630 | / | / | ||
| Rated closed loop breaking current | A | 630 | / | 630,1250 | ||
| Mechanical life | Load switch/ circuit breaker | Times | 5000 | 10000 | ||
| Isolating / earthing switch | 5000 | |||||
| Loop resistance | μΩ | ≤150 | / | ≤150 | ||
| Rated inflation pressure (gauge pressure at 20°C) | Mpa | 0.04 | ||||
| Annual SF6 gas loss rate | % | ≤ 0.05 | ||||
| Degree of protection | Cabinet | IP4X | ||||
| Gas chamber | IP67 | |||||
Product features and structure
Product features
Reasonable design
Modular design to realize flexible combination and expansion: Functional modularity includes load switch unit (C), load switch + fuse combination unit (F), circuit breaker unit (V), metering cabinet unit (M), bus Pt unit (PT), etc. The switchgear can be combined into a common box type non expandable fixed ring network switchgear through various standard unit modules (in the same SF6 insulated gas box, a total of 6 units can be achieved). Different module combinations can also be designed into expandable units. It can achieve many forms of combination through general full insulation and full shielding bus connection, which can meet the demand for different places, different forms, different needs of customers, and provide a variety of designs for power supply and distribution.
Others
The user interface and cable wiring are located in the front of the cabinet, which is convenient for users to operate. The instructions of the operation panel are clear, simple, easy to understand, and the interlocking is reliable, so as to effectively prevent and avoid misoperation.
High safety and reliability
The primary live part and the switch body are sealed in the stainless steel air box, which is connected to the outside through the bushing to avoid direct contact with the live body.
The equipment has a reliable pressure relief device and pressure relief channel, which ensures the safety of personnel and equipment in case of failure; It has perfect mechanical interlocking device, which can prevent misoperation.
Fully insulated and sealed design
The primary live part (main bus) of the panel and switch itself are sealed in the gas tank of welded stainless steel plate. The main circuit is connected to external through DIN47636 standard bushing that installed on the gas tank. It can also be connected to input and output cable by full insulation, shielding all full sealed separable connector. And protection grade of the gas tank box reach IP67. The inside of the gas tank is not affected by the external environment. It also has the short-term resistance function of flood and condensation.
Small volume
Small volume, saving floor space.
Less maintenance
The high-voltage insulation is not affected by the external environment, and is not easy to age. It adopts a maintenance-free vacuum (arc interrupter) switch, which is almost maintenance-free, has a long life cycle and low operating costs.
Strong environmental adaptability
The high-pressure components are sealed in a gas-filled metal shell, which is especially suitable for harsh environments such as high altitude, severe cold, humidity, salt spray, and pollution.
Product structure & Outline structure
1. Barometer
2. Operating hole of load switch
3. Operating hole of earthing switch
4. Air box compartment
5. View window
6. Pressure relief chamber
7. Cable room (front door)
8. Disconnector
9. Energy storage operation hole of circuit breaker
10. Fuse (built-in)
11. Live display
12. Secondary instrument room
Outline structure dimensions
| Number of units | 1 | 2 | 3 | 4 | 5 | 6 |
| W (mm) | 375 | 700 | 1025 | 1350 | 1675 | 2000 |
Note: W (see the table above) ×750×1600mm, with a maximum of 6 co-boxes, and the interval width of each additional unit is 325mm (see the co-box plan table for details). The height of 1600 does not include the secondary instrument room, and the height of the secondary instrument room can be adjusted as required.
Frequently Asked Questions
Q1: Which standards does this switchgear comply with?
A1: The switchgear is designed and manufactured in full compliance with major international standards, including IEC62271-200, EN50181, GB/T3906, GB/T11022, DL/T404, GB/T1984, GB/T1985, GB/T20840, and GB/T11032.
Q2: What are the protection ratings for the cabinet and gas chamber?
A2: The cabinet has a protection rating of IP4X, whereas the gas chamber features a fully sealed protection rating of IP67, protecting internal components from external environmental conditions.
Q3: Can the switchgear handle high-altitude installations?
A3: Yes. The standard service condition supports altitudes up to 4000m. If operating above 1000m, the inflation pressure can be adjusted during manufacture according to user requirements.
Q4: What are the main benefits of the modular design?
A4: The modular design allows for flexible combinations of common-box and expandable units (such as load switches, circuit breakers, metering cabinets, etc.) to meet space-saving and design requirements for various secondary distribution substations.
Q5: Why does this switchgear require minimal maintenance?
A5: All high-voltage live parts are sealed inside a stainless steel gas chamber, preventing aging from external contamination. It also uses a maintenance-free vacuum switch, ensuring a long life cycle and lower overall operating costs.