Oil Evacuation and Nitrogen Injection Extinguishing Equipment of Transformer

1. System Overview

The Oil Evacuation and Nitrogen Injection Extinguishing Equipment of Transformer is a specialized fire protection system designed specifically for the fire hazards associated with oil-immersed power transformers.

In the event of an internal fault or an incipient fire within the transformer, the system rapidly drains high-temperature transformer oil while simultaneously injecting inert nitrogen gas into the transformer tank, thereby quickly suppressing combustion, reducing explosion risk, and preventing fire escalation.

This system is widely applied in substations, power plants, and critical industrial facilities, and is recognized internationally within the power industry as a mature, reliable active fire suppression and explosion-prevention solution dedicated to oil-immersed transformers.

2. Key Advantages

1. Coordinated Oil Drainage and Nitrogen Injection for High Fire Suppression Efficiency

By rapidly removing the burning fuel (transformer oil) and injecting nitrogen to reduce oxygen concentration, the system suppresses fire development simultaneously from both the fuel source and combustion-supporting conditions.

2. Effective Prevention of Transformer Explosion

The system significantly reduces internal tank pressure and temperature, minimizing the risk of explosion caused by oil vapor expansion or secondary combustion.

3. Dedicated Design for Oil-Immersed Transformers

Engineered according to the structural characteristics of oil-immersed transformers, the system is suitable for large-capacity and high-voltage transformers requiring direct tank protection.

4. Automatic Response with Rapid Actuation

The system can be interlocked with transformer protection systems and fire detection systems, enabling automatic activation and rapid intervention during the early stage of a fire.

5. Safe and Environmentally Friendly with Minimal Secondary Damage

Nitrogen, an inert extinguishing medium, produces no chemical residue and has minimal impact on equipment and the environment.

6. Self-Sealing Cylinder Valve for Enhanced Safety

A self-sealing nitrogen cylinder valve is employed; under normal operating conditions, the nitrogen injection piping remains unpressurized, significantly improving system safety.

7. Mechanical Interlock Nitrogen Injection Design to Prevent Maloperation

A reliable mechanical interlock control mechanism ensures the correct operating sequence—oil drainage first, nitrogen injection second—preventing transformer tank overpressure.

8. Dual-Lock Oil Drainage Mechanism for Operational Safety

The oil drainage device incorporates a dual safety locking design, preventing unintended oil discharge under normal conditions while ensuring rapid and reliable oil drainage during emergency activation.

3. Operating Principle

1. An internal fault or fire occurs within the transformer, and the protection system detects abnormal conditions.

2. Upon receiving an activation signal, the oil drainage and nitrogen injection fire suppression system automatically operates.

3. The oil drainage valve opens rapidly, discharging high-temperature transformer oil into an emergency oil pit or safe oil collection system.

4. Simultaneously, high-pressure nitrogen gas is injected into the transformer tank, reducing oxygen concentration and suppressing combustion.

5. The system continues to operate until the fire is effectively controlled, preventing re-ignition and explosion.

4. System Components

5. Main Technical Parameters

6. Typical Applications

• Oil-immersed transformers and oil-immersed reactors in transmission and distribution substations

• Oil-immersed transformers and oil-immersed reactors in thermal power plants, hydropower plants, and nuclear power plants

• Oil-immersed transformers and oil-immersed reactors serving industrial facilities

Contact Us

If you are seeking an Oil Evacuation and Nitrogen Injection Extinguishing Equipment of Transformer with the following features:

• A dedicated fire suppression and explosion-prevention solution specifically designed for oil-immersed transformers

• Coordinated oil drainage and nitrogen injection with high fire suppression efficiency

• Automatic response with significantly reduced explosion and re-ignition risks

• Compliance with power industry and fire protection safety design requirements

Please contact our fire protection solutions team. We provide:

• Transformer fire risk assessment and system configuration recommendations

• Technical solutions, code-compliance consultation, and design support

• Product selection, engineering pricing, and project coordination services

• Installation guidance, commissioning support, and operation & maintenance training

We are committed to delivering safe, reliable, and internationally compliant transformer-dedicated fire protection solutions for power and industrial clients worldwide.