THDL Group | High Voltage Intelligent Switchgear & GIS Equipment Manufacturer

About THDL Group

THDL Group is a professional high-tech enterprise specializing in the research, development, and manufacturing of intelligent switchgear for high voltage power transmission and transformation systems. With years of engineering expertise, we deliver reliable, efficient, and innovative solutions to power utilities and infrastructure projects globally.

Our mission is to advance the safety, stability, and intelligence of electrical grids through cutting-edge technology and precision engineering. Scientific and technological innovation is the lifeline for the survival and development of our enterprise.

550kV–1100kV

Ultra-High Voltage Components

72.5kV–1100kV

Wide Voltage Range Support

Product Center

Comprehensive range of high-voltage mechanisms and intelligent switchgear systems designed for reliability, efficiency, and long-term performance in demanding environments.

CYD-4 Hydraulic Disc Spring Mechanism

Uses disc springs as energy storage components with excellent force characteristics, unaffected by environmental temperature, high energy storage, and smooth operation.

Voltage: High Voltage
Features: Manual/Electric Storage, Slow Operation
Environment: Indoor/Outdoor, -30°C to +60°C

CYD-8 Hydraulic Disc Spring Mechanism

Complete hydraulic system with combined disc spring, working cylinder, control valve, oil pump motor, and safety components for stable high-pressure operation.

Components: Energy Storage Cylinder, Safety Valve
Function: High-Pressure Oil Drain, Travel Switch
Application: GIS & Circuit Breakers

CT126-1 Circuit Breaker Mechanism

Supports manual and electric energy storage and breaking/closing. Features slow operation mode, automatic reclosing, and mechanical anti-tripping device.

Operation: Manual/Electric
Safety: Anti-tripping, Reclosing
Altitude: Up to 3000m

LW55S-252 Spring Operating Mechanism

High-power three-phase mechanical operating mechanism using springs for energy storage, driven by motor rotation and gear transmission.

Type: Three-Phase Linkage
Drive: Motor + Gear Transmission
Storage: Spring-Based

170kV GIS Circuit Breaker Mechanism

Specialized mechanism for GIS applications with full manual/electric functionality, slow operation, reclosing, and anti-tripping protection.

Voltage: 170kV GIS
Functions: Storage, Breaking, Closing
Environment: -30°C to +60°C

CJ8-5 Three Station Mechanism

Electric operating mechanism with adjustable output torque (100–252N·m) and angle (60°–300°), suitable for diverse switching requirements.

Torque: 100–252N·m
Angle: 60°–300°
Voltage: DC110V, DC125V, DC220V

CJ8SD-II GIS Earthing Switch

Special three-station mechanism for GIS earthing and isolation switches with robust torque and wide environmental tolerance.

Application: GIS Earthing & Isolation
Torque: 100–252N·m
Environment: Wind pressure ≤700Pa

550kV–1100kV Precision Components

Ultra-high voltage switchgear precision parts engineered for durability, accuracy, and performance in extreme electrical conditions.

Range: 550kV to 1100kV
Type: Precision Mechanical Parts
Use: HGIS, PASS, GIS Systems

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Why Choose THDL Group?

Advanced Technology

Utilizing hydraulic disc springs, precision gears, and intelligent control systems for superior performance and reliability in high-voltage environments.

Wide Application Range

Products support voltages from 10kV to 1100kV, suitable for indoor/outdoor use, high altitudes, and extreme temperature conditions.

Global Reach

Serving clients across multiple regions with multilingual support and international compliance standards.

Our Applications

THDL Group's intelligent switchgear and mechanisms are deployed in power transmission, substation automation, and high-voltage transformation projects worldwide. Our solutions ensure grid stability, safety, and operational efficiency.

GIS & HGIS Systems

Integrated solutions for Gas-Insulated Switchgear and Hybrid systems, including disconnecting switches, earthing switches, and control mechanisms.

Transformer On-Load Tap Changers

Precision tap changers for 10kV–110kV transformers, enabling voltage regulation under load without interruption.

Frequently Asked Questions

What voltage ranges do THDL products support?

Our products cover a wide range from 10kV up to 1100kV, including medium, high, and ultra-high voltage applications.

Are THDL mechanisms suitable for outdoor use?

Yes, most of our mechanisms are designed for both indoor and outdoor environments with protection against humidity, wind, and temperature extremes.

Do you offer automatic reclosing functionality?

Yes, many of our circuit breaker mechanisms support automatic reclosing with mechanical anti-tripping protection.

What are the operating temperature limits?

Standard operating range is from -30°C to +60°C, suitable for most climatic conditions.

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Intelligent High Voltage Switchgear Solutions