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China Suppliers Factory HXGN66-12 Box-Type Fixed AC Metal-Enclosed Switchgear for 3.6-12kV Systems
Standards
- GB 3906-2006 "AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages from 3.6 kV to 40.5 kV"
- IEC 60298-1990 "Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1 kV and Up to 52 kV"
- GB/T 11022-2011 "Common Technical Requirements for High-Voltage Switchgear and Controlgear Standards"
Model and Definitions
Application Conditions
- Ambient Temperature: Maximum +40℃, Minimum -15℃;
- Altitude: Not exceeding 1000m;
- Relative Humidity: Daily average not exceeding 95%, Monthly average not exceeding 90%;
- Earthquake Intensity: Not exceeding level 8;
- Locations without fire, explosion hazards, severe pollution, chemical corrosion, or severe vibrations.
Major Technical Parameters
| No. | Items | Units | Technical Parameters |
|---|---|---|---|
| 1 | Nominal Voltage | KV | 3.6, 7.2, 12 |
| 2 | Rated Current | A | 630, 1250 |
| 3 | Rated Short-circuit Breaking Current | KA | 20, 25, 31.5 |
| 4 | Rated Short-circuit Making Current | KA | 50, 63, 80 |
| 5 | Rated Short-time Withstand Current (4s Valid Value) | KA | 20, 25, 31.5 |
| 6 | Rated Peak Withstand Current (Peak) | KA | 50, 63, 80 |
| 7 | 1min Power Frequency Withstand Voltage | KV | 42 |
| 8 | Lightning Impulse Withstand Voltage | KV | 75 |
| 9 | Secondary Circuit 1min Power Frequency Withstand Voltage | KV | 2 |
| 10 | Level of Protection | IP3X | |
| 11 | DIMENSIONS (Cable Outlet, Width x Depth x Height) | mm | 900x1000x2200 |
Product Structure
◇ Switchgear Schematic Diagram (Fig. 1)
◇ The switchgear features a box-type fixed structure, with the cabinet body constructed from thin plates and angle steel welded together. The upper rear section houses the main busbar chamber, which is equipped with a pressure relief device at the top. The front upper section contains the relay room, where small busbars can connect via cables from the bottom. The middle-lower part is open, with the busbar chamber electrically connected to it through a GN30 rotary isolating switch. In the center, a vacuum breaker is installed, and at the lower part, either a grounding switch or an outgoing-side isolating switch is present. The back section houses current transformers, voltage transformers, and surge suppressors, with a time cable exiting from the lower rear of the cabinet. The cabinet bottom includes a grounding busbar, which runs through the entire row of switchgear. The isolating switch and grounding switch can be operated from the left front side of the cabinet.
◇ The switchgear utilizes corresponding mechanical interlocking devices. This interlocking structure is simple, easy to operate, and reliably prevents accidents.
◇ This interlocking can only be disengaged from the "ON" position to the right-rotating "OFF" locked position after the circuit breaker has indeed been tripped. This prevents the operation of the isolating switch under load.
◇ When both the circuit breaker and the upper and lower isolating switches are in the "ON" state, the front cabinet door remains locked to prevent accidental entry into the live compartment.
◇ Additionally, when both the circuit breaker and the upper and lower isolating switches are closed, the handle cannot turn to the "Maintenance" or "OFF" locked position. This avoids accidental tripping of the circuit breaker. When the handle is set to the "OFF" locked position, only the upper and lower isolating switches can be opened; the circuit breaker cannot be closed, thus avoiding any potential mistakes in operation.
◇ If the upper and lower isolating switches haven't been tripped, the grounding switch cannot be closed. The handle cannot turn from the "OFF" locked position to the "Maintenance" position, thus preventing live grounding.
Note: Depending on the switchgear plan, some configurations may not include a lower isolating switch or may replace it with a grounding switch. The interlocking and safety measures will still meet the requirements.
Installation Dimensions and Basic Schematic Diagram
- INSTALLATION FOUNDATION REFERENCE DIAGRAM (FIGURE 2): The foundation channel steel should protrude 1-3mm above the ground. Additionally, the unevenness within a one-meter range must not exceed 1.5mm, and the total length must not exceed 5mm.
- Place the switchgear in the correct order on the foundation, adjusting the installation position appropriately. Once aligned, secure it using M12 bolts or spot welding. Fasten the cabinets together using M8 bolts.
- Remove the rear cover plate to install the main busbar and time cable. Ensure that the terminal contact surfaces are clean and apply neutral petroleum jelly. After installation, be sure to seal the time cable holes properly.
- Connect the grounding busbar between cabinets, ensuring they are unified along the switchgear arrangement. Check for any missing ground connections, confirm the continuity of the grounding circuit, and ensure the grounding resistance does not exceed 1Ω.
- Install the secondary cable, leading it from the bottom front of the cabinet, entering the relay room along the side wall, and branching onto the terminal block. After installation, seal the cable holes.
- Finally, clean any dust and debris inside the cabinet.
Factory documentation
◆ DOCUMENTS AND ATTACHMENTS TO BE PROVIDED BY THE MANUFACTURER AT DELIVERY:
- Shipping List;
- Product Certificate of Compliance and Factory Test Report;
- User Manual;
- Relevant Electrical Diagrams;
- Main Component Specifications;
- Cabinet Door Keys, Operating Handles, and Spare Parts as specified in the contract.
Ordering Instructions
- Time Cable Wiring Scheme Diagram and Time Cable Wiring Arrangement Diagram.
- Secondary Circuit Schematic, Wiring Diagram, and Terminal Wiring Diagram.
- List of First and Second Time Equipment.
- Switchgear Layout Diagram and Installation Location of Busbar Trays.
- For spare parts and special application conditions of the equipment, please consult with our company.
Frequently Asked Questions (FAQ)
What standards does this switchgear comply with?
This switchgear complies with GB 3906-2006, IEC 60298-1990, and GB/T 11022-2011 standards, ensuring high quality and safety for high-voltage installations.
What are the ambient temperature limits for this equipment?
The switchgear is designed to operate in ambient temperatures ranging from a minimum of -15℃ to a maximum of +40℃.
What is the protection level of the cabinet?
The cabinet features a protection rating of IP3X, which protects against solid objects larger than 2.5mm.
How does the interlocking mechanism prevent operational accidents?
The switchgear features a mechanical interlock that prevents the isolating switch from operating under load, locks the front door when active, and prevents live grounding if the isolating switches remain untripped.
What documents are provided by the manufacturer at delivery?
Delivery includes the shipping list, product certificate of compliance, factory test report, user manual, electrical diagrams, main component specifications, and all contracted accessories.
What information is needed to place an order?
Customers should provide the time cable wiring scheme, secondary circuit schematic, terminal wiring diagrams, equipment lists, layout diagram, and mention any special application conditions.