The GNF38-12KVseries indoor isolation switch is designed and manufactured to meet the needs of the development of xed high-voltage cabinets and ring main units towards compactness and miniaturization. It has a three station structure and a fully insulated bottom plate. And equipped with coaxial locking and a complete mechanical interlocking mechanism, the appearance is compact and small. It is the best optional switch for compact box type switchgear.

1.Model and meaning

2.Normal environmental conditions for use

Altitude: ≤ 1000m.

Surrounding air temperature: upper limit+40 ℃, lower limit -25 ℃.

Relative humidity: daily average ≤ 95%, monthly average ≤ 90%,

The surrounding air should not be signicantly polluted by corrosive or ammable gases, water vapor, etc,

No frequent severe vibrations.

3.Main technical parameters

4.Installation dimensions and external dimensions

Installation Techniques for High Voltage Isolation Switches

High Voltage Isolating Switch Installation Tips

Installing a high voltage isolating switch is a critical task in electrical systems, ensuring safety, efficient operation, and compliance with industry standards. Here are some essential tips for the proper installation of these switches.

1. Understand the Switch Type and Purpose

Before installation, it’s crucial to understand the specific type of isolating switch being used. High voltage isolating switches serve to disconnect a section of the circuit, allowing maintenance or repair work to be performed safely. They are designed to handle high-voltage currents and must meet stringent safety regulations.

2. Select the Appropriate Location

The switch should be installed in an easily accessible location. Ensure that the site is free from environmental hazards, such as water or excessive heat, which could interfere with the operation of the switch. The installation area should provide enough space for proper ventilation and maintenance access.

3. Ensure Proper Grounding

Proper grounding of the isolating switch is essential to avoid electrical shocks. Make sure that all grounding systems are installed according to the manufacturer’s instructions and industry standards. Check the grounding resistance using an appropriate meter to confirm the effectiveness of the ground connection.

4. Follow Manufacturer’s Installation Instructions

Each high voltage isolating switch comes with a set of detailed installation instructions from the manufacturer. These instructions must be followed to ensure the switch operates correctly and safely. Pay close attention to the recommended torque values for screws and bolts, as well as any special mounting requirements.

5. Use Correct Tools and Equipment

When installing the isolating switch, use the right tools for the job. This includes insulated tools for working around live components, torque wrenches for accurate tightening, and proper lifting equipment for heavy switches. Using the correct tools ensures the installation is performed safely and in compliance with industry standards.

6. Verify Electrical Compatibility

Ensure that the isolating switch is compatible with the electrical system’s voltage, current ratings, and other parameters. The switch must be rated for the specific voltage level and should be able to withstand short circuits and overloading situations.

7. Check for Adequate Clearances

When installing the isolating switch, make sure that there are sufficient clearances around the device to avoid interference with surrounding equipment. This includes maintaining proper distances from other electrical components to minimize the risk of arcing or other electrical faults.

8. Implement Safety Procedures

Safety must be a top priority during installation. Make sure that all power is turned off before starting work on the isolating switch. Use lockout/tagout procedures to ensure the system remains de-energized during installation. Install warning signs around the work area to alert personnel to the ongoing work.

9. Test the Switch After Installation

Once the switch is installed, perform a series of tests to verify its functionality. This includes checking the switch’s ability to isolate circuits properly and confirming that all mechanical and electrical components are operating as intended. Additionally, test the Insulation resistance to ensure there is no leakage current.

10. Regular Maintenance and Inspections

After installation, establish a regular maintenance schedule to inspect and test the isolating switch. Over time, wear and tear can affect the performance of the switch, so it’s essential to regularly check for signs of damage or degradation. Keeping a maintenance log and performing periodic inspections will help avoid unexpected failures.

Conclusion

The installation of high voltage isolating switches requires careful planning, attention to detail, and adherence to safety protocols. By following these installation tips and considering the manufacturer’s guidelines, you can ensure a smooth and safe installation process. Proper installation and maintenance will help extend the life of the switch, reduce downtime, and ensure safe operation of electrical systems.

Main parameters of high-voltage isolation switch

Main Parameters of High Voltage Isolating Switches

High voltage isolating switches are essential components in electrical systems, ensuring safe disconnection and isolation of circuits for maintenance and repair. Understanding their key parameters is crucial for selecting the right switch for specific applications. Below are the primary parameters that define the performance and functionality of high voltage isolating switches.

1. Voltage Rating

The voltage rating is one of the most critical parameters of a high voltage isolating switch. It indicates the maximum voltage that the switch can safely handle without risk of electrical breakdown or arcing. This rating is usually expressed in kilovolts (kV). It is essential to choose a switch with a voltage rating that matches or exceeds the system’s operating voltage to ensure safety and reliability.

2. Current Rating

The current rating refers to the maximum current that the isolating switch can handle when it is in the closed position. This rating ensures that the switch will not overheat or experience damage during normal operation. The current rating is typically specified in amperes (A), and it should match the expected current flowing through the circuit during regular operation.

3. Breaking Capacity

Breaking capacity is the maximum short-circuit current the isolating switch can interrupt without causing damage to the switch or the surrounding system. This parameter is essential to prevent catastrophic failures during fault conditions. The breaking capacity is usually specified in kiloamperes (kA) and is determined based on the system's fault levels.

4. Mechanical Endurance

Mechanical endurance refers to the number of times the isolating switch can be operated (opened and closed) without failure due to wear or mechanical damage. This is an important consideration for switches used in systems where frequent switching is required. The mechanical endurance is typically specified in operations (e.g., 10,000 or 20,000 operations).

5. Electrical Endurance

Electrical endurance refers to the number of times the isolating switch can open and close under normal load or fault conditions without degradation in performance. This parameter is different from mechanical endurance and focuses on the switch’s ability to handle electrical stress over time. Electrical endurance is measured in operations and can be influenced by factors such as voltage and current ratings.

6. Insulation Resistance

Insulation resistance is a measure of the ability of the isolating switch to resist the flow of electrical current through its insulating components. High insulation resistance is essential to prevent leakage currents that can pose a safety hazard. It is typically measured in megohms (MΩ), and a higher resistance value indicates better insulating performance.

7. Contact Resistance

Contact resistance refers to the resistance at the point of contact when the switch is closed. Low contact resistance ensures minimal energy loss and prevents excessive heating of the contacts. This parameter is critical for maintaining the long-term efficiency of the isolating switch and is typically measured in milliohms (mΩ).

8. Switching Speed

Switching speed is the rate at which the isolating switch can open or close. Faster switching speeds are beneficial in preventing damage to the system during fault conditions, but the speed must be balanced with mechanical and electrical endurance to avoid excessive wear. Switching speed is typically specified in milliseconds.

9. Operating Temperature Range

The operating temperature range specifies the minimum and maximum temperatures at which the isolating switch can function reliably. It ensures that the switch can operate in diverse environmental conditions without compromising safety or performance. High voltage isolating switches are generally designed to operate in temperatures ranging from -40°C to 60°C, depending on the specific model.

10. Arc Extinguishing Capability

Arc extinguishing capability refers to the isolating switch’s ability to safely quench an electrical arc that occurs when the switch is operated under load or fault conditions. Switches with good arc extinguishing properties help prevent damage to the switch and surrounding equipment. The design of the switch, including its contacts and mechanisms, directly influences its arc quenching ability.

11. Installation and Mounting Type

The installation and mounting type of the isolating switch refer to how the switch is physically installed in the electrical system. Common types include indoor and outdoor mounting, wall-mounted, or on a switchgear panel. The mounting type influences the switch's accessibility, protection, and maintenance needs.

12. Degree of Protection (IP Rating)

The degree of protection, specified by the International Protection (IP) rating, defines the switch's resistance to environmental factors such as dust, moisture, and other external elements. A higher IP rating, such as IP55 or IP65, indicates better protection and suitability for harsh outdoor conditions.

Conclusion

When selecting a high voltage isolating switch, it is essential to consider these key parameters to ensure it meets the needs of the electrical system. Factors such as voltage rating, current rating, breaking capacity, and insulation resistance play a significant role in the switch’s reliability and performance. By understanding these parameters, you can make an informed decision when choosing the right isolating switch for your application, ensuring safety, efficiency, and long-term durability.