(H) GW□-12 (40.5)/630-20 outdoor AC High Voltage Isolation Switch is an outdoor High Voltage electrical equipment with AC 50Hz, rated voltage levels of 10kV, 15kV, and 24kV. It is used for opening high-voltage lines under no-load conditions, as well as electrically isolating high voltage lines with live electrical equipment such as high-voltage busbars and Circuit Breakers under maintenance. It can also be used for opening and closing small capacitor or inductor currents. is series of outdoor isolating switches meets the relevant provisions of standards such as GB1985 "AC High Voltage Isolating Switches and Grounding Switches", IEC60129 "AC Isolating Switches and Grounding Switches", and GB/T11022 "Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards".

1.Model and meaning

1.Environmental conditions for use

Altitude: ≤ 1000m

Surrounding air temperature: upper limit+40 ℃, lower limit -30 ℃ in general areas, -40 ° C in high-altitude areas

Wind pressure: ≤ 700Pa, (equivalent to a wind speed of 34m/s)

Places without frequent and severe vibrations

Ordina installation sites should be free of gases, vapors, chemical deposits, salt spray, dust, and other explosive and corrosive 

substances that seriously aect the Insulation and conductivity of isolation switches

Anti pollution type is suitable for heavily polluted areas, but should not contain substances that can cause res or explosions

2.Main technical parameters

3.Appearance and installation dimensions

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.