The GGD low voltage switchgear is applied in power plants, substations, industry and mine corporations, etc. with rated voltage 400V, max operating current 4000A and rated frequency 50/60Hz. It can be applied as power conversion distribution control, distribution and control of power, lighting and power distribution, etc.
The cabinet structure of GGD type adopts the form of general cabinet, the frame is assembled by local welding of cold bending section steel, so it is firm and solid.
The parts of the general cabinet are designed according to the principle of module, and have the installation hole with 20mm as the module, and the common coefficient is high. It can make the factory realize the pre-production, not only shortens the production cycle, but also improves the working efficiency.
Installation Site: Indoor
Altitude: No more than 2000m.
Earthquake Intensity: No more than 8 degrees.
Ambient Temperature: No more than +40℃ and no less than – 15℃.Average temperature is no more than +35℃ within 24 hours.
Relative Humidity: the average daily value is no more than 95%, the average monthly value is no more than 90%.
Installation locations: without fire, explosion danger, serious pollution, chemical corrosion and violent vibration.
The frame has sufficient strength and rigidity, which can withstand the mechanical stress and electrodynamic force generating from installation components and short circuit, At the same time it does not affect the performance of the device because of the hoisting and transportation of the device, etc.
When the cabinet is designed, the heat dissipation in the operation of the equipment is fully taken into account. There are different number of radiating slots in the upper and lower ends, heat is going up when the electrical components in the cabinet are heating, and is discharged through the top slot, and the cold wind constantly from the bottom slot is supplied into the cabinet, the sealed cabinet body bottom forms a natural ventilation from bottom to top, which achieves the purpose of heat dissipation.
The instrument door equipped with the electrical components is connected with the frame with many annealed copper wires. The installation parts in the cabinet are connected to the frame with the knurled screws, and the whole cabinet forms a complete grounding protection circuit.
The cabinet cover can be removed, if necessary, to facilitate the main bus assembly and adjustment on site. Flying rings are provided at the four comers of the cabinet top for lifting and shipping.
| No. | Content | Unit | Value | |
| 1 | Rated Operation Voltage | V | 400 | |
| 2 | Rated Insulation Voltage | V | 690 | |
| 3 | Rated Frequency | Hz | 50/60 | |
| 4 | Main Bus-Bar | Rated Current | A | ≤4000 |
| Rated Short-time Withstand Current | kA | ≤80 | ||
| Rated Peak Withstand Current | kA | ≤176 | ||
| 5 | Distribution Bus | Rated Current | A | ≤2000 |
| Rated Short-time Withstand Current | kA | ≤50 | ||
| Rated Peak Withstand Current | kA | ≤105 | ||
| 6 | Frequency Withstand Voltage in 1min of Aux Control Loop | kV | 1.89 | |
| 7 | Rated impulse Withstand Voltage | kV | 8 | |
| 8 | Degrass of Protection | IP | IP40/IP30 | |
| 9 | Electrical Clearance | mm | ≥10 | |
| 10 | Creepage Distance | mm | ≥12.5 | |
| 11 | Overvoltage Level | Ⅲ/IV | ||
| 12 | Pollution Degree | 3 | ||
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