Basic Knowledge of Oil Discharging Nitrogen Injection Fire Suppression Device for Oil-Immersed Transformers
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In power plants, substations and power transmission and distribution engineering projects, oil-immersed power transformers are core power equipment that bears voltage conversion and power transmission tasks. Due to the large amount of insulating transformer oil inside the equipment, internal short circuit, overheating, insulation aging and other faults are easy to induce fire and explosion accidents, causing huge equipment losses and power grid operation risks. The oil discharging nitrogen injection fire suppression device for oil-immersed transformers is a special professional fire protection system tailored for oil-filled transformer fire hazards. It integrates automatic fire detection, intelligent signal control, rapid oil discharge pressure relief and nitrogen inerting fire extinguishing functions, and is the most reliable active fire safety protection solution for power transformers at present.
This article systematically sorts out the industry implementation standards, core component parameters, installation specifications, working principles and complete supply scope of the oil draining and nitrogen injection fire extinguishing device, providing professional reference for power engineering design, equipment selection, construction acceptance and daily operation and maintenance.
1. Domestic Authoritative Industry Implementation Standards
The oil discharging and nitrogen injection fire suppression system belongs to special fixed fire fighting equipment for power facilities. Its design, production, installation, construction and acceptance must strictly comply with national industry standards, power industry specifications and local standard codes to ensure operational safety, stability and compliance. The applicable mainstream domestic standards are as follows:
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No |
Standard Number and Full Name |
Standard Application Scope |
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1 |
DL 5027-2015 Typical Fire Protection Regulations for Power Equipment |
Specifies the general fire protection layout and safety technical requirements for all types of power equipment including transformers |
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2 |
GB 50229-2019 Fire Protection Design Standard for Thermal Power Plants and Substations |
National mandatory standard for fire protection design of substation and thermal power plant transformer systems |
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3 |
GA 835-2009 Oil Immersed Transformer Oil Drainage and Nitrogen Injection Fire Extinguishing Device |
Special technical standard for product performance and quality of transformer oil discharge nitrogen injection fire extinguishing devices |
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4 |
GA 61-2010 General Technical Requirements for Driving and Control Devices of Fixed Firefighting Systems |
Unified technical specifications for control drive components of fixed fire protection systems |
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5 |
CECS 187:2005 Technical Code for Oil Immersion Transformer Oil Drainage and Nitrogen Injection Devices |
Industrial technical code for system design, construction and operation specification |
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6 |
DB 43/T 420-2008 Design, Construction, and Acceptance Specifications for Oil Immersion Transformer Oil Drainage and Nitrogen Injection Fire Protection Systems |
Local special specification for engineering construction, commissioning and acceptance of fire protection systems |
2. Core Components, Technical Parameters and Installation Specifications
The complete set of transformer oil draining nitrogen injection fire suppression system consists of fire fighting cabinet, control cabinet, flow interruption valve, fire detectors, oil discharge pipeline and nitrogen injection pipeline. Each component has strict operating environment parameters and standardized installation requirements, adapting to harsh outdoor and indoor power station operating conditions.
2.1 Fire Fighting Cabinet (On-Site Execution Unit)
The fire fighting cabinet is the on-site execution core of the fire suppression system, undertaking the functions of oil discharge and nitrogen injection execution, medium storage and pipeline switching. It is designed for outdoor harsh working conditions with strong environmental adaptability.
Operating Ambient Temperature: -40℃ to +60℃, capable of adapting extreme high and low temperature environments in northern and southern regions
Operating Ambient Relative Humidity: ≤85% (at +40℃), effectively resisting humid and rainy working conditions
Standard Installation Distance: 3-8m away from the transformer body, ensuring safe operation and avoiding secondary fire hazards
System Connection Mode: Connected to the main transformer through dedicated oil drain and nitrogen injection pipelines, forming an integrated fire extinguishing execution loop
2.2 Control Cabinet (System Intelligent Control Core)
As the intelligent brain of the entire fire protection system, the control cabinet realizes real-time signal monitoring, fault judgment, automatic alarm and linkage control, ensuring rapid and accurate system response.
Operating Ambient Temperature: 0℃~+50℃, indoor professional design suitable for relay room operation environment
Installation Layout: Indoor fixed installation in power station relay room, stable operation and convenient maintenance
Signal Connection Scope: Connected with fire fighting cabinets, monitoring cabinets, main transformer terminal boxes, shutdown valves, fire detectors, gas relays, pressure relief valves, quick-acting relays and circuit breakers through dedicated cables
Core Functions: Real-time receiving and analyzing fire detection signals, issuing alarm prompts and automatic control commands, realizing full-link intelligent linkage of transformer fire protection
2.3 Flow Interruption Valve (Safety Isolation Component)
The flow interruption valve is a key safety isolation component of the system, which can effectively cut off the oil supply channel in case of transformer fire, prevent fire spread and reduce equipment damage.
Installation Position: Installed on the connecting pipeline between transformer oil conservator and gas relay, targeting the key oil supply channel
Working Principle: When the system starts oil drainage and fire extinguishing, the valve closes automatically under the thrust of oil flow, completely cutting off the oil circuit from the oil conservator to the transformer main tank, preventing continuous oil supply from aggravating fire accidents
Weather Resistance Design: Equipped with special customized rain cover, which effectively prevents rainwater erosion, dust accumulation and outdoor environmental aging, improving long-term operation reliability of equipment
2.4 Fire Detectors (Fire Sensing Monitoring Device)
The system is equipped with two types of high-sensitivity temperature-sensing fire detectors, adapting to different temperature threshold fire hazard monitoring requirements of transformer key heating parts, with rainproof and anti-interference design.
Glass Sphere Type Fire Detector: Operating temperature 93℃±10℃, suitable for conventional temperature rise fire monitoring
Fluorescent Alloy Type Fire Detector: Operating temperature 130℃±10℃, adapted to high-temperature working parts with higher heat generation
Installation Position: Arranged in key high-temperature prone areas such as transformer high and low pressure bushings and pressure relief valves
Protection Design: Equipped with stainless steel rainproof cover, which is anti-corrosion, dust-proof and weather-resistant, ensuring stable signal detection in outdoor long-term operation
Core Function: Real-time monitoring of ambient temperature of key components, automatically sending fire alarm signals once the temperature exceeds the standard, triggering linkage fire extinguishing program
2.5 Oil Drainage and Nitrogen Injection Pipelines (Transmission Pipeline System)
The system pipeline adopts hot-dip galvanized seamless steel pipe with high pressure resistance, anti-corrosion and aging resistance, meeting the long-term safe operation requirements of power equipment.
Oil Draining Pipeline: Adopts DN125 hot-dip galvanized seamless steel pipe, installed between transformer body and fire cabinet oil drainage system, equipped with vent bolts to ensure smooth oil drainage and pressure relief
Nitrogen Injection Pipeline: Adopts DN25 hot-dip galvanized seamless steel pipe, arranged between transformer body and fire cabinet nitrogen injection system, with vent bolts to guarantee uniform and stable nitrogen injection
Pipeline Advantages: High structural strength, strong pressure resistance, excellent anti-corrosion performance, suitable for long-term outdoor and indoor power station operating environment, no leakage and stable transmission
3. Complete Supply Scope of Oil Discharging Nitrogen Injection Fire Suppression Device
We provide one-stop full-set configuration solutions for transformer oil draining and nitrogen injection fire protection systems, covering all core equipment and supporting pipelines, realizing integrated supply, convenient installation and unified commissioning, which is widely applicable to new construction, renovation and expansion projects of power plant and substation transformer fire protection systems.
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Configuration Scheme |
Supply Interface Description |
Detailed Supply Content |
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General Standard Full Configuration |
Complete set of integrated oil discharge and nitrogen injection fire extinguishing system, supporting on-site installation, commissioning and normal operation |
Fire fighting cabinet, intelligent control cabinet, high-sensitivity fire detector, flow interruption shut-off valve, full set of hot-dip galvanized seamless steel oil drainage and nitrogen injection pipelines and supporting accessories |
4. Core Advantages of Oil Draining Nitrogen Injection Fire Suppression System
Compared with traditional transformer fire protection methods, the oil discharging and nitrogen injection fire suppression device has obvious technical and safety advantages, and has become the mainstream fire protection scheme for oil-immersed transformers in the power industry:
- Fast Fire Extinguishing & Anti-Reignition: It realizes rapid oil discharge and pressure relief to eliminate open fire, and injects high-purity nitrogen to form an inert environment inside the transformer, completely isolating oxygen and fundamentally preventing fire re-ignition
- Full Intelligent Linkage: Realizes automatic detection, automatic alarm and automatic fire extinguishing linkage, no manual intervention required in case of emergency, greatly improving emergency response efficiency
- Strong Environmental Adaptability: The whole set of equipment adapts to extreme temperature and humid environment, with rainproof, dust-proof and anti-corrosion design, suitable for outdoor substation and power plant harsh working conditions
- High Safety & Low Loss: No water spraying, no secondary damage to transformer equipment, effectively reducing equipment maintenance costs and power grid operation risks
- Strict Compliance & Standardization: Fully compliant with national and industry standards, meeting power engineering acceptance specifications, safe and reliable for long-term operation
- Long-tail Keywords for Search Engine Inclusion: Oil immersed transformer fire protection solution, substation transformer fire extinguishing system, automatic nitrogen injection fire suppression equipment, power transformer oil drain fire safety device, transformer fire monitoring and linkage control system
