110kv 1250a 2000a Disconnector Switch

The 110kV 1250A 2000A Disconnector Switch is a three-phase AC 50Hz outdoor high-voltage electrical appliance with a rated voltage of 126kV (110kV level) and a rated current of 1250A/2000A. It is mainly used for opening and closing operations under no-load conditions, reliably isolating maintenance equipment from live lines and forming a clearly visible break.

Usune, as a professional factory specializing in the R&D and manufacturing of high-voltage switchgear, offers products for 110kV main transmission substations, meeting the requirements for safe operation of the power grid.

Structural Features

1. Double-Column Horizontal Rotating Structure

Each phase has two insulated columns that rotate synchronously 90° horizontally to achieve opening and closing; the base is made of hot-dip galvanized steel with sealed bearings, making it corrosion-resistant and durable.

2. High Conductivity Contact System

The 110kV 1250A 2000A Disconnector Switch's split-type main contacts are made of silver-plated copper, resulting in low contact resistance, high current carrying capacity, and minimal overheating during long-term operation.

3. Optional Grounding Switch and Interlock

Models with grounding switches are equipped with reliable mechanical interlocks, strictly following the sequence of "main switch open → grounding switch closed; grounding switch open → main switch closed," effectively preventing misoperation.

4. Flexible Operating Mechanism

Can be configured with CS14G or CS17G manual mechanisms, or CJ6B or CJ11 electric mechanisms, supporting local and remote control.

Main Technical Parameters

Application Advantages

1. High Reliability

- Manufactured using advanced production equipment and rigorous testing methods to ensure product consistency and stability.
- Standard high-quality materials and exquisite craftsmanship lay a solid foundation for product quality.
- A comprehensive quality management system covers the entire production process from raw material warehousing to finished product delivery.

2. Wide Environmental Adaptability

- Standard models can operate stably in a temperature range of -40℃ to +40℃, suitable for most regions.
- The pollution-resistant type (GW4-126W) features enhanced insulation, making it ideal for heavily polluted areas such as coastal regions, industrial areas, or areas with high dust, salt spray, or chemical corrosion.
- It can withstand severe weather conditions such as strong winds, heavy rain, and blizzards.

3. Safe and Convenient Operation

- A clear mechanical interlocking mechanism effectively prevents misoperation, ensuring the safety of personnel and equipment.
- The 110kV 1250A 2000A Disconnector Switch has a compact structure, requiring little installation space, making it easy to install, adjust, and maintain.
- Visible breakpoints provide intuitive safety assurance for maintenance operations.

Practical Application Case

1. Case Study: 110kV Wind Farm Substation in Southeast Coastal Area

2. Project Background: A 110kV wind farm located in the southeast coastal area of China, an area with high salt spray concentrations, high humidity, and severe pollution.

3. Applied Product: Usune GW4-126W 2000A Anti-Pollution Disconnect Switch (12 sets)

4. Implementation Results:
- Successfully operated for 5 years without any failures, adapting to the harsh coastal salt spray environment.
- The anti-pollution composite insulator maintained excellent insulation performance, with no creepage discharge or pollution flashover.
- The silver-plated contacts remained bright, with stable contact resistance, and no overheating occurred under long-term 1800A operating current.

5. Project Manager Feedback: "The Usune disconnect switch demonstrated excellent anti-pollution performance, fully meeting the stringent environmental requirements of coastal wind farms."

Main Technical Parameters

Outer Dimensions

INSTALLATION & COMMISSIONING

1. Inspection Before Installation

• Insulators: No cracks, damage, or dirt.
• Contacts: Clean, silver-plated surface intact.
• Fasteners: All bolts tightened.
• Mechanism: Smooth rotation; lubricate moving parts.

2. Adjustment

• Insulator verticality: Adjust with shims (max 3mm per location).
• Three-phase synchronization: Adjust crank-arm and linkage rods.
• Contact pressure: Ensure proper insertion and pressure.

OPERATION

• Only operate under NO LOAD; confirm circuit breaker is open.
• Manual operation: Use operating handle; avoid excessive force.
• Motorized operation: Use local/remote control; monitor position.
• Interlock: Do not force operation if interlocked.

MAINTENANCE

• Periodic overhaul: Every 1–2 years.
• Clean insulators and contacts; apply industrial vaseline.
• Lubricate bearings and transmission parts.
• Check for loose bolts, worn contacts, and insulator damage.
• After short-circuit: Inspect immediately.

TROUBLESHOOTING

• Cannot operate: Check interlock, jammed linkage, or motor fault.
• Asynchronous phases: Adjust cross-linkage rods.
• Contact overheating: Clean and retighten; check silver plating.

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQ

Q1: What are the main differences between the 1250A and 2000A disconnect switches?

A: The core difference is the rated current carrying capacity. The 1250A is suitable for medium-load 110kV substations, while the 2000A is suitable for high-current main transformer incoming and outgoing circuits. The structure, insulation class, and installation dimensions are basically the same.

Q2: Can this 110kV 1250A 2000A Disconnector Switch be used in coastal or highly polluted areas?

A: Yes. Anti-pollution (W-type) products are available, with a creepage distance of 31.5mm/kV. They use anti-pollution porcelain insulators or composite insulators, and are resistant to salt spray and dust corrosion.

Q3: As a supplier, what technical support can Usune provide?

A: We can provide selection solutions, installation drawings, on-site commissioning guidance, and free repair services during the warranty period. Standard models are delivered quickly to meet the time requirements of power grid projects.