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Temperature measurement of the busbar of the distribution cabinet

Busbar temperature in distribution cabinets is best monitored using non-contact infrared sensors, fiber optic sensors, or embedded temperature sensors to ensure safety, accuracy, and continuous monitoring.

Non-

Contact Infrared (IR) SensorsNon-contact IR sensors are widely used for busbar temperature measurement because they provide instant readings without physical contact, reducing the risk of electric shock or arc hazards. Key points include: Installation: Sensors are mounted inside the switchgear cabinet at a safe distance from the busbar. Surface Preparation: Painting the busbar surface with high-emissivity paint improves measurement accuracy.

Optics: Wide-angle optics (2: 1) are suitable for short distances, while narrow optics (20: 1) allow longer measurement distances. Integration: Systems like PyroMiniBus can network multiple sensors to a central hub, providing real-time monitoring, data logging, and alarms, which can be integrated into SCADA systems.

Fiber Optic Temperature Sensors

Fiber optic sensors, such as the DTSX system, are ideal for long bus ducts or complex routing where electromagnetic interference is high. Advantages include: Electromagnetic Immunity: Fiber optics are unaffected by strong electrical fields. Continuous Monitoring: They provide 24/7 temperature monitoring along the entire busbar length.

Localization: Abnormal hotspots can be pinpointed with high spatial resolution, enabling timely maintenance. Integration: Can be connected to control systems for alarms and historical data analysis.

Embedded Temperature Sensors

Embedded sensors, such as PT100 bolt sensors, can be permanently installed in drilled holes on the busbar to measure internal temperatures directly. Benefits include: Consistent Measurement: Always measures the same spot, reducing variability caused by ambient cooling. Automated Alerts: Sensors can trigger alarms when temperatures exceed thresholds.

Data Logging: Continuous recording allows trend analysis and predictive maintenance.

Best Practices

Monitor Critical Points: Focus on busbar joints and bolted connections, which are prone to overheating due to increased resistance. Preventive Maintenance: Early detection of temperature rise allows tightening of bolts or other corrective actions before failure occurs. Integration with SCADA: Centralized monitoring enables real-time visualization, alarm management, and historical analysis for maintenance planning.

Environmental Considerations: Ensure sensors can operate within the ambient temperature range of the cabinet, typically up to 120°C for IR sensors. By combining these methods, distribution cabinets can achieve safe, accurate, and continuous busbar temperature monitoring, reducing the risk of equipment failure, fire, and operational downtime.

Temperature measurement of the busbar of the distribution cabinet

Busbar Temperature Monitoring in Switchgear Cabinets

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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