High Voltage Disconnector

The GW4 Series High Voltage Disconnector, spanning the full 40.5kV to 252kV voltage range, is a critical safety component for power systems. Engineered with a double-column horizontal rotating structure, it is specifically designed to perform the core functions of voltage isolation, maintenance safety assurance, and auxiliary circuit switching in high-voltage applications.

Core Application Scenarios

This high voltage disconnector is deployed across key high-voltage power segments, precisely matching diverse operational requirements:

1. Power Generation & Substation Core Circuits

Widely installed in thermal, hydro, and renewable energy power plants, as well as substations of all voltage levels, the device acts as a safety barrier for busbars, circuit breakers, transformers, and other critical equipment. It creates a clear, visible breaking point in de-energized circuits, ensuring complete electrical separation between maintenance personnel and live high-voltage lines to prevent accidents caused by on-load switching. For extra-high voltage (EHV) applications, 126kV, 145kV, and 252kV models are used for busbar sectionalization and dual-side protection of circuit breakers, while the 72.5kV model is optimized for line switching in regional substations.

2. Transmission & Distribution Lines and Renewable Energy Facilities

In long-distance high-voltage transmission lines, the device handles line maintenance isolation and the switching of voltage transformers and surge arresters, with optimized performance for interrupting no-load current of overhead lines within 10km. For wind, photovoltaic, and other renewable energy sites, 40.5kV and 72.5kV models support DC-side isolation and combiner box protection, featuring an enhanced anti-corrosion design to withstand harsh outdoor environments. The 252kV model meets the EHV grid connection requirements of large-scale renewable energy bases, enabling a de-energized system reconfiguration.

3. Industrial & Special High-Voltage Systems

In high-voltage distribution systems of large-scale industrial facilities such as metallurgical and chemical plants, the device provides maintenance isolation and circuit switching for workshop high-voltage equipment, with pollution and vibration resistance tailored to complex industrial environments. It can be equipped with earthing switches on demand; in special high-voltage systems including railway traction power supply and urban rail transit, a mechanical interlocking device enforces the correct operating sequence between the earthing switch and the main disconnector, dissipates residual equipment charge, and maximizes operational safety.

4. Extreme Environment & Custom Configuration Scenarios

The device operates reliably in extreme temperatures ranging from -40°C to +40°C, withstands 34m/s strong winds and 10mm ice coating, and is adaptable to high-altitude areas up to 4000m above sea level and heavy pollution zones. In double-busbar systems, it supports de-energized switching of operating lines to optimize the grid operation structure. Selected models are fitted with grading rings and shielding covers to improve electric field distribution and reduce radio interference, making them suitable for high-voltage circuits supporting precision instruments.

Core Advantages

Built on industry-leading structural optimization and material upgrades, the GW4 Series delivers six core advantages that significantly improve the reliability, safety, and operational efficiency of high-voltage power systems.

1.Industry-Leading Safety Isolation, Compliant with Global Standards

As a double-column high voltage disconnector, its single-break design and horizontal rotating mechanism form a stable insulation gap after opening. The mechanical interlock between the earthing switch and the main disconnector enforces mandatory operating sequences, eliminating structural risks of misoperation. The contacts adopt a copper plate bending process, with a short make-break friction stroke and low operating force. Exposed steel parts are treated with hot-dip galvanizing, maintaining a clear breaking point after long-term outdoor service, fully meeting the core requirements of reliable isolation and arc-free operation, and complying with IEC 62271-102 international standards.

2.Superior Conductivity & Thermal Stability for Uninterrupted Operation

The conductive rod is made of high-strength aluminum alloy profiles, featuring light weight and a large heat dissipation area. Combined with a copper braided wire flexible connection structure, it ensures tight contact between the outlet seat and the conductive rod, significantly reducing main circuit resistance and avoiding overheating during operation. The contact pieces use external pressure stainless steel springs, with stable force values and rust resistance, preventing spring shunting from affecting conductivity. It safely supports rated currents from 1250A to 6300A across the full voltage range, ensuring long-term reliable current carrying.

3. Excellent Corrosion Resistance for Long-Term Outdoor Service

Optimized for outdoor applications, the device’s transmission parts adopt corrosion-resistant connectors such as stainless steel pins and composite bushings, with all metal components undergoing hot-dip galvanizing treatment to effectively resist erosion from rain, snow, salt spray, and industrial dust. The improved copper-copper or stainless steel-copper matching shaft hole structure completely solves the common seizure problem of outdoor high-voltage equipment. With a mechanical life of over 3000 operations, it achieves long-term maintenance-free operation, greatly reducing Operation and Maintenance (O&M) costs.

4. Compact Modular Design for Flexible Installation

The modular design delivers high structural stability, with earthing switches that can be installed on either side of the base, supporting both single-earthing and double-earthing configurations to meet diverse protection requirements. Its standardized mounting hole design simplifies on-site construction, and the terminal can be freely rotated 90° for convenient flexible busbar connection. It is flexibly adaptable to both centralized substation layouts and decentralized outdoor line installations.

5. Enhanced Withstand Capability for Harsh Operating Conditions

The device has a rated short-time withstand current of 31.5kA to 63kA and a rated peak withstand current of 80kA to 160kA, withstanding extreme short-circuit shocks in high-voltage circuits. The insulator has a maximum specific creepage distance of 31mm/kV, meeting Class IV pollution degree requirements and maintaining excellent insulation performance in heavily polluted areas. It also features earthquake resistance (horizontal acceleration 0.25g) and strong wind resistance, ensuring intact isolation function and structural integrity under extreme weather conditions, providing all-weather safety protection.

6. Simplified Maintenance & Controllable Lifecycle Costs

The contacts and conductive rod adopt modular assembly for easy disassembly and replacement; the bearing housing is equipped with a waterproof structure and an oil injection hole, enabling routine maintenance without complex tools. Compared with traditional high-voltage disconnectors, its self-energizing contact structure ensures constant contact pressure during operation, eliminating the need for frequent adjustment. Combined with the maintenance-free design concept, it significantly reduces maintenance frequency, cuts O&M workload, and improves the continuous operation stability of high-voltage distribution systems.

For power system operators and industrial users, the GW4 Series minimizes lifecycle costs while maximizing the safety and reliability of high-voltage power supply. Fully compliant with international IEC standards and proven in diverse operating environments, the GW4 Series is a trusted choice for mission-critical high-voltage infrastructure projects worldwide.

Product Parameters