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China XGTD7 Indoor Gas Insulation Metal-clad Switchgear (12/240.5 - Suppliers & Factory Direct
General
The product has features of flexible combinations, great safety, complete interlocking logic as well as extensibility, miniaturization and free for maintenance. So that it was commonly used in infrastructure construction for power station, power substation, movable transformer pack, buildings that have the 35kV or below nominal voltage. Especially for some sever environment like high altitude, heavy pollution and high humidity.
Service conditions
- Ambient temperature: -25℃~+40℃, the daily average value shall not exceed 35 ℃
- Altitude: Not more than 5000m above the sea level (If the equipment is running above 1000m, please specify it specifically for the convenience of adjusting the inflation pressure during manufacturing)
- Relative humidity: Daily average is not more than 95%, Monthly average is not more than 90％
- Seismic grade: the seismic intensity shall not exceed grade 8
- Electromagnetic interference: The electromagnetic interference amplitude induced by the secondary system: not more than 1.6KV
Note: if the service environment exceeds the above conditions, please consult with the manufacturer.
Technical parameter
Main technical parameters of switchgear
| Item | Unit | Parameters | |||
|---|---|---|---|---|---|
| Rated voltage | kV | 12 | 24 | 40.5 | |
| Rated current | A | 630/1250/1600/2000/2500 | |||
| Rated frequency | Hz | 50/60 | |||
| 1 min rated power frequency withstand voltage (RMS) | Phase to Phase/Phase to earth | kV | 42 | 65 | 95 |
| Isolating fracture | 48 | 79 | 118 | ||
| Rated Lightning impulse withstand voltage (peak) | Phase to Phase/Phase to earth | kV | 75 | 125 | 185 |
| Isolating fracture | 85 | 145 | 215 | ||
| Rated power frequency withstand voltage of auxiliary circuit | kV | 2 | |||
| Rated short-circuit breaking current (r.m.s) | kA | 20/25/31.5 | |||
| Rated short-circuit making current (peak) | kA | 50/63/80 | |||
| Rated short-time withstand current (4s) | kA | 20/25/31.5 | |||
| Rated peak withstand current | kA | 50/63/80 | |||
| Main circuit resistance of each phase | μΩ |
Rated current≤1600A, Rc≤200 Rated current≥2000A，Rc≤105 |
|||
| Rated voltage of auxiliary and control circuit | V | DC110/220 AC220 | |||
| Rated working pressure of insulation gas(20℃) | MPa | 0.05 | |||
| Min working pressure of insulation gas(20℃) | MPa | 0.03 | |||
| Annual loss rate of insulation gas | ‰ | ≤5 | |||
| Degree of Protection | / |
HV gas compartment IP67 LV compartment IP4X |
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| Weight | Kg | 1000~1600 | |||
Typical scheme
A - Cable room | B- Main switch room | C - Instrument room | D - Mechanism room
Figure 1 Typical structure and outline dimension diagram of XGTD7-40.5/1250 Circuit Breaker Cabinet (Bus top expansion)
A - Cable room | B- Main switch room | C - Instrument room | D - Mechanism room
Figure 2 Typical structure and outline dimension diagram of XGTD7-40.5/1250 Circuit Breaker Cabinet (Bus side expansion)
Frequently Asked Questions (FAQ)
What are the primary applications of this switchgear?
This switchgear is commonly used in power stations, power substations, movable transformer packs, and buildings with a nominal voltage of 35kV or below. It is particularly designed to perform reliably in severe environments, including high altitude, heavy pollution, and high humidity.
What is the maximum altitude for standard operation?
The switchgear is rated for altitudes up to 5000m above sea level. However, if your equipment will operate above 1000m, please specify this during ordering so that manufacturing can adjust the internal gas inflation pressure accordingly.
What are the protection ratings (IP grade) for the compartments?
The High Voltage (HV) gas compartment features an IP67 protection rating, offering complete protection against dust and temporary water immersion. The Low Voltage (LV) compartment has an IP4X protection rating to safeguard against solid objects.
What is the gas leakage rate and working pressure of the insulation gas?
The rated working pressure of the insulation gas is 0.05 MPa (at 20℃) with a minimum operating pressure limit of 0.03 MPa. The annual loss rate of the insulation gas is exceptionally low, strictly controlled at ≤5‰.
Can the switchgear operate in extreme temperatures and high seismic zones?
Yes, the switchgear operates in ambient temperatures ranging from -25℃ to +40℃ (with a daily average not exceeding 35℃). It is also rated to withstand seismic intensities up to grade 8. If your environmental conditions exceed these standard specifications, please consult the manufacturer for customized solutions.