The switchgear comprises a circuit breaker chamber, a busbar chamber, a mechanism chamber, a cable chamber, an instrument chamber, and a pressure relief channel. The gas chamber is formed into a sealed box by aluminum casting and welding. Both the main bus bar chamber and the circuit breaker chamber are enclosed gas-filled compartments filled with environmentally friendly gas at a pressure of 0.32Mpa, serving as an insulating medium.
XGZ20 is a medium voltage gas insulated switchboard up to 40.5kV, 1250A, 31.5kA, 4s. It is used in secondary power distribution and is designed for customised application of switchgear in:
·Compact secondary substations
·Industrial applications
·Wind and solar power plants
·Hotels, shopping centres, office buildings, business centres etc.
Electrical Parameters
| S/N | Parameter Name | Unit | Specification |
1 | Rated Voltage | kV | 40.5 |
| 2 | Rated Frequency | Hz | 50/60 |
| 3 | 1min Power Frequency Withstand Voltage (RMS) *(Phase to Phase, Ground / Fracture)* | kV | 95/118 |
| 4 | Lightning Impulse Withstand Voltage (RMS) *(Phase to Phase, Ground / Fracture)* | kV | 185/215 |
| 5 | Rated Current | A | 630, 1250 |
| 6 | Rated Short Circuit Breaking Current | kA | 31.5 |
| 7 | Rated Short Time Withstand Current / Duration | kA/s | 31.5/4 |
| 8 | Rated Peak Withstand Current | kA | 80 |
| 9 | Rated Short Circuit Making Current (Peak) | kA | 80 |
| 10 | Protection Degree of Gas-filled Enclosure | IP | 67 |
| 11 | Protection Degree of Cabinet | IP | 4X |
| 12 | Rated Pressure of Environmentally-friendly Gas *(Gauge Pressure at 20℃)* | MPa | 0.32 |
| 13 | Minimum Functional Pressure of Environmentally-friendlyGas *(Gauge Pressure at 20℃)* | MPa | 0.26 |
| 14 | Annual Leakage Rate of Environmentally-friendlyGas | - | ≤ 0.05% |
| 15 | Internal Arc Classification | - | IAC A(FLR) 31.5kA /1s |
