Indoor Air Isolation Switch

The Usune GN series Indoor Air Isolation Switch is a core high-voltage electrical product independently developed by Zhejiang Usune Electric Co., Ltd., a leading supplier of high-voltage electrical equipment in China. Integrating the latest domestic R&D technologies and manufacturing processes, it is specifically designed for high-current operating conditions at the generator outlets of large power plants and steel mills, filling the market gap for high-performance indoor high-current disconnecting switches.

This switch features a flexible structural design, allowing it to be assembled into three independent single-pole units or configured as a three-pole integrated device to suit different spatial layouts and usage requirements, depending on site installation needs. Its core function is to provide reliable power isolation during the maintenance of electrical equipment and systems. By creating a clear break in the circuit, it ensures the safety of maintenance personnel and the integrity of equipment, meeting the core safety isolation requirements of high-voltage power systems.

Product Design and Model Description

1. Structural Design Advantages

The Usune GN series adopts a scientifically robust structural design, combining compact layout and convenient operation. The three-pole integrated configuration effectively saves installation space, while the independent single-pole design facilitates individual maintenance and replacement, enhancing product flexibility and maintainability. The switch uses high-quality conductive and insulating materials, ensuring excellent conductivity while improving insulation performance and service life, meeting the long-term stable operation requirements of indoor high-voltage environments.

2. Model Code Explanation

The Usune GN series Indoor Air Isolation Switch model numbers follow standardized coding rules, making them clear and easy to understand, allowing customers to select the appropriate specification according to their actual needs. Typical models are GN□--20DW/8000--80. The specific meanings of each code (from left to right) are as follows:

- G: Disconnecting switch (core product type, indicating the product's main function of power isolation)
- N: Indoor type (indicates the product is designed for indoor installation)
- □: Design serial number (distinguishes different design versions within the same series)
- 20: Rated voltage (unit: kV, indicating the highest voltage the switch can stably withstand)
- D: Switch with grounding (equipped with grounding function to ensure safe discharge during maintenance)
- W: Anti-pollution type (enhanced anti-pollution performance, suitable for harsh indoor environments with high pollution levels)
- 8000: Rated current (unit: A, indicating the maximum current the switch can continuously withstand)
- 80: Rated short-time withstand current (unit: kA, indicating the maximum short-circuit current the switch can withstand within a specified time)

Technical Parameters

Usune adheres to the principle of professional precision; the GN series Indoor Air Isolation... The switch boasts comprehensive technical parameters to meet diverse needs in various industrial scenarios. All parameters undergo rigorous factory testing and verification to ensure compliance with standards and stable product performance:

- Voltage Rating: 12kV, 20kV, 35kV (Three specifications to suit different high-voltage power system configurations)
- Current Rating: 2000A, 3150A, 4000A, 5000A, 6000A, 8000A, 9000A, 10000A (Eight specifications to suit high current conditions at generator outputs)
- Product Type: Ungrounded, Single-grounded, Through-wall type (Three types to suit different installation environments and functional requirements)

Usage Conditions

1. Ambient Temperature: -50℃～+50℃ (Stable operation in extreme temperature environments)
2. Altitude: ≤2000m (Adaptability can be enhanced upon request for altitudes ≥2500m)
3. Wind Pressure: ≤700Pa (equivalent to wind speed ≤34m/s, suitable for well-ventilated indoor environments)
4. Seismic Intensity: ≤8 (withstands moderate earthquake impacts, ensuring stable operation in earthquake-prone areas)
5. Ice Thickness: ≤20mm (suitable for cold indoor environments where icing is possible)
6. Pollution Degree: Class III, IV (pollution-proof design, suitable for indoor environments with high dust or chemical pollution)
7. Installation Location: Free from flammable and explosive hazards, chemical corrosion, and severe vibration (special usage conditions can be determined through negotiation between the user and the manufacturer)

Outer dimension

Project Reference

Cas-space Rocket Launch Project

Test Report

Real-world Application Case

Case Study: Large Coal-fired Power Plant in Shandong, China

A large coal-fired power plant in Shandong Province, China, with an installed capacity of 2×600MW, requires a high-current disconnect switch at the generator outlet to ensure safe maintenance of the generator units and power system. After in-depth investigation and comparison, the power plant selected the Usune GN series 20kV/8000A indoor high-voltage disconnect switch (with grounding switch, pollution-proof type). As the designated manufacturer, Usune provides customized installation guidance and after-sales service. The product has been operating stably for three years since its deployment in 2023.

During operation, the switch withstood the test of high current and harsh indoor environment (pollution level IV) without any faults such as poor contact or insulation damage. It effectively fulfilled the power isolation task during generator set maintenance, ensuring the safety of maintenance personnel and the normal operation of the power plant. The customer highly recognizes the product performance and Usune's professional service and has signed a long-term cooperation agreement with Usune, designating it as the supplier of disconnecting switches.

FAQ

Q1: What is the core function of the Usune GN series Indoor Air Isolation Switch, and can it be used to interrupt load current?

A1: The core function is to provide reliable power isolation during the maintenance of electrical equipment and systems. By creating a clear break in the circuit, it ensures the safety of maintenance personnel and equipment. It is important to emphasize that this product is a power isolation device, not a load disconnector switch. It cannot be used to interrupt load current or short-circuit current; it can only be operated when the circuit is unloaded or after the load current has been interrupted by other switching equipment.

Q2: Can the Usune GN series Indoor Air Isolation Switch be customized to meet specific on-site usage conditions?

A2: Yes. As a professional manufacturer, Usune possesses comprehensive R&D and customization capabilities. For users with special usage conditions (such as altitude ≥2500m, special pollution levels, or special installation space requirements), we can engage in in-depth communication to adjust product design and parameters based on the actual on-site conditions, providing customized solutions. Special usage conditions are determined through negotiation between the user and the manufacturer to ensure the product is suitable for the on-site working environment and actual needs.