The ZHW12-40.5 gas insulated metal composite combined electrical apparatus (HGIS) is composed of several standard functional modules, such as circuit breakers, disconnecting/earthing switches, voltage transformers, current transformers, etc. These modules have the same interface forms and dimensions, and various modules can be combined to meet the design and layout requirements of various substations.
Normal Service Conditions:
| Installation Location | Indoor or outdoor |
| Ambient Temperature | -30 ~ +40℃ (special order -40 ~ +55℃) |
| Altitude | 1000m (special order unlimited) |
| Air Humidity | Daily average ≤95%, monthly average ≤90% (25℃) |
| Wind Speed | ≤34m/s (wind pressure not greater than 700Pa) |
| Solar Radiation Intensity | ≤0.1W/cm2 (0.5m/s wind speed) |
| Seismic Intensity | Horizontal acceleration ≤0.5g, vertical acceleration ≤0.25g (intensity 9 earthquake) |
| Ice Thickness | ≤10mm |
| Creepage Distance Ratio | 25mm/kV (pollution class III), 31mm/kV (pollution class IV) |
No flammable, explosive hazards or chemical corrosion, severe vibration places
