GCK power distribution cabinet

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The GCK power distribution cabinet, also known as the GCK low-voltage withdrawable switchgear, is a common low-voltage complete set of power distribution equipment. The following is a detailed introduction to it:

### Scope of Application It is applicable to occasions such as power plants, substations, factories, enterprises, and high-rise buildings. It is used for power distribution, centralized control of motors, and reactive power compensation in power systems with an alternating current frequency of 50 - 60Hz, a rated working voltage of 660V or less, and a rated current of 4000A or less.

### Structural Features

- **Cabinet Frame**: The cabinet frame is generally assembled by partial welding of 8MF cold-formed profiles. Its rigidity and load-bearing capacity meet the installation requirements of electrical components. There are mounting holes distributed according to a specific sequence on the frame, which can improve the universality of product assembly.

- **Busbar System**: The main busbars are arranged at the upper part of the cabinet. The busbar clamps with a building block-like combined structure are adopted, such as the ZMJ type busbar clamps, which are injection-molded from high-flame-retardant PPO materials, have high mechanical strength and insulation degree, can carry relatively large currents, and the long-term allowable temperature under the impact of thermal stability can reach a relatively high value.

- **Drawer Units**: The drawer units adopt a modular design and can be flexibly configured according to different circuit requirements. Each drawer unit has independent functions, including incoming line, feeder, control, etc., which is convenient for maintenance and repair. When a certain drawer unit fails, it can be pulled out separately for maintenance without affecting the normal operation of other drawer units.

### Technical Parameters

- **Rated Insulation Voltage**: AC 660V, AC 1000V.

- **Rated Working Voltage**: AC 380V, AC 660V.

- **Rated Frequency**: 50Hz.

- **Maximum Current of Feeder Circuit**: 3150A.

- **Maximum Current of Drawer Circuit**: 3150A.

- **Maximum Capacity of Controlled Motor**: 320kW.

- **Peak Withstand Current of Horizontal Busbar (0.1 second)**: 63kA, 105kA, 176kA.

- **Short-Time Withstand Current of Horizontal Busbar (1 second)**: 30kA, 50kA, 80kA, 100kA.

- **Peak Withstand Current of Vertical Busbar (0.1 second)**: 63kA, 105kA.

- **Short-Time Withstand Current of Vertical Busbar (1 second)**: 30kA, 50kA.

- **Rated Power Frequency Withstand Voltage (1 minute)**: 2500V.

- **Secondary Power Frequency Withstand Voltage (1 minute)**: 2500V. - **Protection Level**: IP30, IP40.

### Working Environmental Conditions

- **Temperature**: The range of the ambient temperature should not exceed +40°C at the highest and not be lower than -5°C at the lowest. The average temperature within 24 hours should not be higher than +35°C. When the limit is exceeded, derating operation should be considered.

- **Humidity**: When the ambient temperature is +40°C, the relative humidity should not exceed 50%. At lower temperatures, the relative humidity may be higher. For example, it can reach 90% when the temperature is +20°C. Attention should be paid to the influence of condensation caused by the temperature difference.

- **Installation Location**: It is only used indoors, and the altitude should not exceed 2,000 meters.

- **Installation Inclination**: When the device is installed, the maximum inclination with the vertical plane should not exceed 5°, and it is necessary to ensure that the entire cabinet row is relatively flat.

- **Stability**: It should be installed in a place without severe vibration and impact to prevent the electrical components from being corroded unnecessarily.

### Advantages - **High Breaking Capacity**: It can quickly cut off the circuit in case of faults such as short circuits to protect the safety of equipment and lines.

- **Good Dynamic and Thermal Stability**: When withstanding the impact of short-circuit current, it has good mechanical strength and thermal stability and is not prone to deformation and damage.

- **Flexible Electrical Schemes**: Through the combination of different drawer units, various electrical control schemes can be realized to meet the needs of different users.

- **Strong Series and Universality**: Its structure and components have high universality and interchangeability, which is convenient for production, installation, and maintenance.

- **High Protection Level**: The protection level of the enclosure can reach IP30 or IP40, which can effectively prevent foreign objects from entering and water from splashing into the cabinet, protecting the normal operation of the internal electrical components.

- **Space-saving**: Due to the adoption of the drawer-type structure, under the same number of circuits, it occupies a smaller area compared with other types of power distribution cabinets and can improve the space utilization rate of the distribution room.

### Differences from Other Power Distribution Cabinets Compared with common low-voltage power distribution cabinets such as GGD, GCS, and MNS, the GCK power distribution cabinet has the following characteristics:

- **Structural Form**: The GGD is a fixed power distribution cabinet, while the GCK, GCS, and MNS are drawer-type power distribution cabinets. The drawer units of the GCK were introduced earlier than those of the GCS. In the early stage, the strength of the profiles used was relatively poor, but after continuous improvement, its performance has been greatly improved nowadays.

- **Busbar Location**: The main busbars of the GCK are usually placed on the top of the cabinet, while the main busbars of the GCS are placed at the back.

- **Current Capacity**: The current capacity of the MNS cabinet is relatively higher than that of the GCK and GCS.

- **Operability**: The operability of the MNS cabinet is relatively better, for example, it can be operated on both sides.