Emergency exit light explosion proof in the substation lighting in the fundamental role and safety application guidelines

Introduction: Substation safety challenges and Emergency exit light explosion proof inevitable choice

Substation as the core hub of the power system, long-term arc flash, SF6 gas leakage, dust explosion and high electromagnetic interference and other multiple risks.

Ordinary lighting equipment in a high-pressure, flammable environment is prone to sparks or high-temperature surface caused by serious accidents, threatening the safety of equipment and personnel.

Emergency exit light explosion proof, with their explosion-proof certification design, anti-electromagnetic interference and intelligent emergency function, become the core of substation lighting system safety.

This paper will start from the substation special environment, analysis of Emergency exit light explosion proof application scenarios, technical guidelines and implementation strategies for the power industry to supply high-reliability lighting solutions.

First, the substation explosion risk and Emergency exit light explosion proof core value

1. Substation primary safety hazards

Combustible gases and dust environment: SF6 gas leakage [under the action of arc decomposition into toxic, combustible gases, such as SF4, SOF2].

Transformer oil leakage caused by high temperature vapor explosion [flash point ≥ 140 ℃]. Coal dust or dust accumulation [coal transmission substation] to form explosive mixtures.

Risk of electric arc and electric spark: High-voltage equipment failure may generate thousands of degrees Celsius arc, igniting the surrounding combustible materials.

Extreme electromagnetic environment: Strong electromagnetic interference leads to the failure or malfunction of ordinary lamps and lanterns circuit.

2. Emergency exit light explosion proof safety protection mechanism

Emergency exit lamp explosion proof approved the following technology to implement intrinsic safety:

Composite explosion-proof design: explosion-proof structure [Ex d]: cast aluminum housing isolates the internal arc, suitable for SF6 gas leakage Zone 1 area.

Dust explosion-proof certification [Ex tD]: IP66 sealing design, to prevent the intrusion of coal dust caused by secondary explosion.

Anti-electromagnetic interference [EMC]: the circuit board adopts shielding and filtering technology, in line with IEC 61000-4 guidelines [anti-interference level ≥ 3].

Dual-mode emergency power supply: switch to the super capacitor within 0.3 seconds after the main power supply is interrupted, supplying ≥180 minutes of lighting [in line with GB 17945-2010 guidelines].

Second. Explosion-proof emergency indicator in the substation core application scenarios

1. High-voltage equipment area and switch room

GIS equipment status indication: install explosion-proof emergency indicator next to gas-insulated switchgear [GIS], approving red/green dual-color light real-time feedback air pressure abnormalities [such as ≤ 0.4MPa red light alarm].

Arc light care linkage: integrated light sensor indicator, detecting the arc light within 0.1 seconds to trigger sound and light alarm and start emergency lighting, synchronized cut off the fault circuit.

2. Transformer and oil storage area

Oil temperature and oil level monitoring: the explosion-proof emergency indicator light is equipped with temperature sensors, triggering yellow warning when the oil temperature at the top of the transformer is ≥85℃, preventing overheating and triggering oil explosion.

Emergency evacuation guidance: the oil storage tank area channel is equipped with direction-indicating explosion-proof emergency indicator lights, with ground illumination ≥5lx in case of fire, and arrows guiding the safe exit.

3. Control room and outdoor facilities

Uninterrupted lighting in the main control room: Emergency exit light explosion proof to help UPS power supply access, in the main power supply and backup power supply failure, start the self-supply battery power supply.

Outdoor terminal box lighting: -40 ℃ ~ +70 ℃ wide temperature Emergency exit light explosion proof, protection level IP68, resistant to rain, snow and salt spray corrosion.

Third, substation explosion-proof emergency indicator selection and technical guidelines

1. Certification and compliance requirements

Explosion-proof certification: must be approved ATEX [II 2G Ex d IIC T4 Gb], IECEx or CNEx certification, adapted to SF6 gas environment Zone 1 area.

Power industry standards: comply with DL/T 593-2016 high-voltage switchgear standards and GB/T 17626 electromagnetic compatibility requirements.

2. Fundamental technical parameters

Light source performance: LED light source light efficiency ≥ 130lm/W, color temperature 5000K [cold white], color rendering index Ra>80, accurate identification of meter readings and equipment status.

Emergency range: According to GB 51309-2018 guidelines, the control room and channel need to be equipped with Emergency exit light explosion proof with a range of ≥ 180 minutes.

3. Intelligent function upgrade

SCADA system integration: Approve IEC 61850 protocol to access the substation automation system, real-time uploading of lamp health status and battery capacity data.

Adaptive dimming strategy: automatically adjust the brightness according to the ambient light and equipment operation mode [such as maintenance/normal], energy saving more than 25%.

Fourth, Emergency exit light explosion proof installation and maintenance specifications

1. Specialized installation requirements

Explosion-proof electrical wiring: the use of flame retardant high temperature cable [such as YJV], junction box using Ex e increased safety structure, grounding resistance ≤ 4Ω.

Anti-vibration design: When installing around the transformer, install anti-vibration bracket [amplitude ≤ 0.5mm] to avoid loosening of the structure due to mechanical vibration.

2. Full life cycle maintenance strategy

Monthly inspection: use infrared thermography to detect the surface temperature of the lamps and lanterns [≤80℃], clean the dust in the heat sinks and test the emergency switching function.

Annual in-depth inspection: commission a third-party organization to test the gap between the blasting surface [≤0.15mm], insulation resistance [≥1000MΩ] and electromagnetic immunity.

Fifth. Answers to Common Problems [FAQ

Q1：Do all areas of the substation need Emergency exit light explosion proof?

A: Only SF6 switch room, oil storage area Zone 1 hazardous areas must be used; low-voltage distribution room and other non-hazardous areas can be configured with ordinary emergency lights, but need to be isolated from the hazardous area.

Q2：How to deal with the strong electromagnetic interference in the substation?

A: Choose electromagnetic compatibility level ≥ 3 [IEC 61000-4], circuit board with metal shielding layer products, and ensure reliable grounding [resistance ≤ 4Ω].

Q3：Can outdoor Emergency exit light explosion proof work normally in extreme low temperature?

A: Choose the wide temperature type [-40℃~+70℃] and built-in battery heating module lamps and lanterns, to ensure that -30℃ emergency start time ≤ 1 second.

Q4：How long is the maintenance cycle of Emergency exit light explosion proof?

A: Advocate monthly cornerstone inspection, annual professional testing, super capacitor life ≥ 10 years, lithium battery replacement every 5 years.

Conclusion: Emergency exit light explosion proof – substation safety operation “wisdom of the eye”

In the power system intelligence and safety standards upgrade double drive, explosion-proof emergency indicator has been upgraded from the cornerstone safety equipment for substation intelligent operation and maintenance of the fundamental nodes.

Choose to adapt to the composite explosive environment, with high immunity and intelligent linkage Emergency exit light explosion proof, not only to meet the IECEx, GB 3836 and other stringent standards, but also to approve the predictive maintenance to reduce the cost of the whole life cycle.

In the future, along with the digital twin and edge computing technology integration, explosion-proof emergency indicator will be deeply empowered substation intelligent transformation, for the stable operation of the power grid escort.

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