Oil-immersed Transformer Gas Protection

Oil-immersed transformers, with their advantages of excellent heat dissipation, large capacity, and strong stability, are widely used in key industries such as power generation, chemical industry, metallurgy, construction, mining, and charging stations. Gas protection for oil-immersed transformers, as the main protection against internal faults, acts as an "intelligent early warning system" for the equipment, directly impacting production continuity, personnel and equipment safety, and operating costs. Understanding its core principles is crucial for customers to avoid failures and reduce risks.

What is Gas Protection?

Oil-immersed transformer gas protection (also known as gas relay protection) utilizes the gas generated by internal equipment faults to provide warnings and tripping. Its core function is to detect internal faults in the oil tank, preventing equipment damage and power outages. Regulations stipulate that oil-immersed transformers of 800 kVA and above, and workshop oil-immersed transformers of 400 kVA and above, must be equipped with gas protection.

Differences Between Light and Heavy Gas Protection

Light gas protection primarily addresses minor internal faults such as local overheating and insulation degradation. When the gas volume slowly generated by the fault accumulates to a set volume, it only issues a warning signal, reminding personnel to promptly investigate potential hazards and prevent fault escalation;

Heavy gas protection, on the other hand, targets serious internal faults such as winding short circuits and core burnout. When a large amount of gas is generated instantaneously by the fault, causing an oil flow surge in the oil tank that reaches a set speed, it immediately triggers a tripping action, cutting off all power to the transformer, minimizing accident expansion and reducing equipment and economic losses.

Compared to other protection devices, oil-immersed transformer gas protection has high sensitivity, fast action, and strong adaptability, and excels in detecting hidden faults. It is an essential device for transformers in many industries, providing an added layer of safety for production.

Industry Adaptation: Key Application Points of Gas Protection in Various Fields

Different industries have different working conditions and safety requirements, leading to variations in the selection and maintenance priorities of oil-immersed transformer gas protection. The following analyzes the key adaptation points for six core industries. Power Industry: The First 

Grid Stability

The power industry (power plants, substations) often uses large-capacity, high-voltage oil-immersed transformers such as the S11-M-1600/10 and S13-M-2500/35.  Faults can easily trigger regional power outages. Key considerations: Selecting suitable large-capacity gas relays (such as the QJ-80 type), integrating with intelligent operation and maintenance systems, and ensuring outdoor anti-interference capabilities to prevent false alarms.

Charging Pile Industry

The charging pile industry (centralized charging stations, outdoor charging pile clusters) often uses outdoor oil-immersed transformers such as the S13-M-630/10 and S15-M-800/10. These need to be adapted to frequent start-stops, large load fluctuations, and multiple outdoor/open-air installations. Faults can easily lead to charging interruptions and equipment damage. Key considerations: Selecting miniaturized, outdoor-resistant gas relays, improving sensitivity to minor gas leaks, and accurately detecting hidden faults caused by load fluctuations; linking with the charging pile monitoring system for real-time warning signals to facilitate rapid troubleshooting; and regularly checking seals to prevent rainwater and dust intrusion from affecting operation.

Chemical Industry

The chemical industry environment is characterized by high temperature, high pressure, flammability, explosiveness, and strong corrosiveness.  S9-M-800/10 and S11-M-1000/10 explosion-proof oil-immersed transformers are commonly used. Key considerations: Selecting explosion-proof gas relays, improving detection accuracy, and regularly maintaining seals to prevent gas leaks and corrosion.

Metallurgical Industry

Transformers in the metallurgical industry are subjected to continuous high loads and frequent start-stops, and the environment is often dusty and subject to vibration. High-overload oil-immersed transformers such as the S13-M-1250/10 and S15-M-1600/10 are commonly used. Key considerations: Selecting vibration-resistant and dust-proof models, optimizing setting parameters, and linking with the operation and maintenance system for rapid fault handling. 

Construction Industry

Transformers in the construction industry are mostly installed in enclosed power distribution rooms, and are compatible with S11-M-500/10 and S13-M-630/10 miniaturized oil-immersed transformers. Key features include: using miniaturized gas relays for remote monitoring and early warning, easy operation for non-professional maintenance personnel, and integration with exhaust devices.

Mining Industry

Mining transformers are mostly installed in underground/open-pit mining areas, where the environment is harsh and continuous power supply is critical. They are compatible with KS9-M-800/10 and KS11-M-1000/10 mining-specific oil-immersed transformers. Key features include: using waterproof, dustproof, and vibration-resistant models, enhanced anti-interference capabilities, and a fault self-locking function that transmits signals to the surface.

Oil-Immersed Transformer Gas Protection Solutions

Pain Point 1: Frequent false alarms of gas protection

Reasons: Improper selection, insufficient maintenance, external interference. Solution: Select models suitable for industry working conditions; regularly change oil, check seals, and clean relays; optimize the installation environment to prevent interference.

Pain Point 2: Inability to quickly determine the fault after activation

Reasons: Unfamiliarity with the principle, lack of professional methods. Solution: Light gas analysis of the gas, heavy gas inspection of the appearance and oil sample; do not re-energize until the cause is identified; rely on manufacturer technical support.

Pain Point 3: Device not suitable for industry working conditions

Reasons: Blindly using conventional models. Solution: Clearly define your needs, consult a professional manufacturer for customized solutions. We provide products and one-stop maintenance services.

CLHT Power Transformer Manufacturer Customized Solutions

Oil-immersed transformer gas protection is the last line of defense for equipment safety, directly related to equipment lifespan and production safety. CLHT power has been deeply involved in the industry for 15 years and can provide customized oil-immersed transformers and gas protection solutions based on the working conditions of various industries (including charging stations).

We adhere to the principle of "quality first, customer foremost," providing high-quality products and comprehensive technical support to help customers achieve safe and efficient production. If you have any questions or customization needs, please feel free to contact us!